Index: vendor/phpseclib/phpseclib/AUTHORS
===================================================================
--- vendor/phpseclib/phpseclib/AUTHORS	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/AUTHORS	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,7 @@
+phpseclib Lead Developer:  TerraFrost (Jim Wigginton)
+
+phpseclib Developers:      monnerat (Patrick Monnerat)
+                           bantu (Andreas Fischer)
+                           petrich (Hans-Jürgen Petrich)
+                           GrahamCampbell (Graham Campbell)
+                           hc-jworman
Index: vendor/phpseclib/phpseclib/BACKERS.md
===================================================================
--- vendor/phpseclib/phpseclib/BACKERS.md	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/BACKERS.md	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+# Backers
+
+phpseclib ongoing development is made possible by [Tidelift](https://tidelift.com/subscription/pkg/packagist-phpseclib-phpseclib?utm_source=packagist-phpseclib-phpseclib&utm_medium=referral&utm_campaign=readme) and by contributions by users like you. Thank you.
+
+## Backers
+
+- Allan Simon
+- [ChargeOver](https://chargeover.com/)
+- Raghu Veer Dendukuri
+- Zane Hooper
+- [Setasign](https://www.setasign.com/)
+- [Charles Severance](https://github.com/csev)
+- [Rachel Fish](https://github.com/itsrachelfish)
+- Tharyrok
+- [cjhaas](https://github.com/cjhaas)
+- [istiak-tridip](https://github.com/istiak-tridip)
+- [Anna Filina](https://github.com/afilina)
+- [blakemckeeby](https://github.com/blakemckeeby)
Index: vendor/phpseclib/phpseclib/LICENSE
===================================================================
--- vendor/phpseclib/phpseclib/LICENSE	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/LICENSE	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,20 @@
+Copyright (c) 2011-2019 TerraFrost and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Index: vendor/phpseclib/phpseclib/README.md
===================================================================
--- vendor/phpseclib/phpseclib/README.md	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/README.md	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,97 @@
+# phpseclib - PHP Secure Communications Library
+
+[![CI Status](https://github.com/phpseclib/phpseclib/actions/workflows/ci.yml/badge.svg?branch=3.0&event=push "CI Status")](https://github.com/phpseclib/phpseclib)
+
+## Supporting phpseclib
+
+- [Become a backer or sponsor on Patreon](https://www.patreon.com/phpseclib)
+- [One-time donation via PayPal or crypto-currencies](http://sourceforge.net/donate/index.php?group_id=198487)
+- [Subscribe to Tidelift](https://tidelift.com/subscription/pkg/packagist-phpseclib-phpseclib?utm_source=packagist-phpseclib-phpseclib&utm_medium=referral&utm_campaign=readme)
+
+## Introduction
+
+MIT-licensed pure-PHP implementations of the following:
+
+SSH-2, SFTP, X.509, an arbitrary-precision integer arithmetic library, Ed25519 / Ed449 / Curve25519 / Curve449, ECDSA / ECDH (with support for 66 curves), RSA (PKCS#1 v2.2 compliant), DSA / DH, DES / 3DES / RC4 / Rijndael / AES / Blowfish / Twofish / Salsa20 / ChaCha20, GCM / Poly1305
+
+* [Browse Git](https://github.com/phpseclib/phpseclib)
+
+## Documentation
+
+* [Documentation / Manual](https://phpseclib.com/)
+* [API Documentation](https://api.phpseclib.com/3.0/) (generated by Doctum)
+
+## Branches
+
+### master
+
+* Development Branch
+* Unstable API
+* Do not use in production
+
+### 3.0
+
+* Long term support (LTS) release
+* Major expansion of cryptographic primitives
+* Minimum PHP version: 5.6.1
+* PSR-4 autoloading with namespace rooted at `\phpseclib3`
+* Install via Composer: `composer require phpseclib/phpseclib:~3.0`
+
+### 2.0
+
+* Long term support (LTS) release
+* Modernized version of 1.0
+* Minimum PHP version: 5.3.3
+* PSR-4 autoloading with namespace rooted at `\phpseclib`
+* Install via Composer: `composer require phpseclib/phpseclib:~2.0`
+
+### 1.0
+
+* Long term support (LTS) release
+* PHP4 compatible
+* Composer compatible (PSR-0 autoloading)
+* Install using Composer: `composer require phpseclib/phpseclib:~1.0`
+* [Download 1.0.23 as ZIP](http://sourceforge.net/projects/phpseclib/files/phpseclib1.0.23.zip/download)
+
+## Security contact information
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
+
+## Support
+
+Need Support?
+
+* [Checkout Questions and Answers on Stack Overflow](http://stackoverflow.com/questions/tagged/phpseclib)
+* [Create a Support Ticket on GitHub](https://github.com/phpseclib/phpseclib/issues/new)
+* [Browse the Support Forum](http://www.frostjedi.com/phpbb/viewforum.php?f=46) (no longer in use)
+
+## Special Thanks
+
+Special Thanks to our $50+ sponsors!:
+
+- Allan Simon
+- [ChargeOver](https://chargeover.com/)
+
+## Contributing
+
+1. Fork the Project
+
+2. Ensure you have Composer installed (see [Composer Download Instructions](https://getcomposer.org/download/))
+
+3. Install Development Dependencies
+    ```sh
+    composer install
+    ```
+
+4. Create a Feature Branch
+
+5. Run continuous integration checks:
+   ```sh
+   composer global require php:^8.1 squizlabs/php_codesniffer friendsofphp/php-cs-fixer vimeo/psalm
+   phpcs --standard=build/php_codesniffer.xml
+   php-cs-fixer fix --config=build/php-cs-fixer.php --diff --dry-run --using-cache=no
+   psalm --config=build/psalm.xml --no-cache --long-progress --report-show-info=false --output-format=text
+   vendor/bin/phpunit --verbose --configuration tests/phpunit.xml
+   ```
+   
+6. Send us a Pull Request
Index: vendor/phpseclib/phpseclib/composer.json
===================================================================
--- vendor/phpseclib/phpseclib/composer.json	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/composer.json	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,84 @@
+{
+    "name": "phpseclib/phpseclib",
+    "type": "library",
+    "description": "PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.",
+    "keywords": [
+        "security",
+        "crypto",
+        "cryptography",
+        "encryption",
+        "signature",
+        "signing",
+        "rsa",
+        "aes",
+        "blowfish",
+        "twofish",
+        "ssh",
+        "sftp",
+        "x509",
+        "x.509",
+        "asn1",
+        "asn.1",
+        "BigInteger"
+        ],
+    "homepage": "http://phpseclib.sourceforge.net",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Jim Wigginton",
+            "email": "terrafrost@php.net",
+            "role": "Lead Developer"
+        },
+        {
+            "name": "Patrick Monnerat",
+            "email": "pm@datasphere.ch",
+            "role": "Developer"
+        },
+        {
+            "name": "Andreas Fischer",
+            "email": "bantu@phpbb.com",
+            "role": "Developer"
+        },
+        {
+            "name": "Hans-Jürgen Petrich",
+            "email": "petrich@tronic-media.com",
+            "role": "Developer"
+        },
+        {
+            "name": "Graham Campbell",
+            "email": "graham@alt-three.com",
+            "role": "Developer"
+        }
+    ],
+    "require": {
+        "php": ">=5.6.1",
+        "paragonie/constant_time_encoding": "^1|^2|^3",
+        "paragonie/random_compat": "^1.4|^2.0|^9.99.99"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "*"
+    },
+    "suggest": {
+        "ext-libsodium": "SSH2/SFTP can make use of some algorithms provided by the libsodium-php extension.",
+        "ext-openssl": "Install the OpenSSL extension in order to speed up a wide variety of cryptographic operations.",
+        "ext-mcrypt": "Install the Mcrypt extension in order to speed up a few other cryptographic operations.",
+        "ext-gmp": "Install the GMP (GNU Multiple Precision) extension in order to speed up arbitrary precision integer arithmetic operations.",
+        "ext-dom": "Install the DOM extension to load XML formatted public keys."
+    },
+    "autoload": {
+        "files": [
+            "phpseclib/bootstrap.php"
+        ],
+        "psr-4": {
+            "phpseclib3\\": "phpseclib/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "phpseclib3\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Common/Functions/Strings.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Common/Functions/Strings.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Common/Functions/Strings.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,505 @@
+<?php
+
+/**
+ * Common String Functions
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Common\Functions;
+
+use ParagonIE\ConstantTime\Base64;
+use ParagonIE\ConstantTime\Base64UrlSafe;
+use ParagonIE\ConstantTime\Hex;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\Common\FiniteField;
+
+/**
+ * Common String Functions
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Strings
+{
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     */
+    public static function shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * String Pop
+     *
+     * Inspired by array_pop
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     */
+    public static function pop(&$string, $index = 1)
+    {
+        $substr = substr($string, -$index);
+        $string = substr($string, 0, -$index);
+        return $substr;
+    }
+
+    /**
+     * Parse SSH2-style string
+     *
+     * Returns either an array or a boolean if $data is malformed.
+     *
+     * Valid characters for $format are as follows:
+     *
+     * C = byte
+     * b = boolean (true/false)
+     * N = uint32
+     * Q = uint64
+     * s = string
+     * i = mpint
+     * L = name-list
+     *
+     * uint64 is not supported.
+     *
+     * @param string $format
+     * @param string $data
+     * @return mixed
+     */
+    public static function unpackSSH2($format, &$data)
+    {
+        $format = self::formatPack($format);
+        $result = [];
+        for ($i = 0; $i < strlen($format); $i++) {
+            switch ($format[$i]) {
+                case 'C':
+                case 'b':
+                    if (!strlen($data)) {
+                        throw new \LengthException('At least one byte needs to be present for successful C / b decodes');
+                    }
+                    break;
+                case 'N':
+                case 'i':
+                case 's':
+                case 'L':
+                    if (strlen($data) < 4) {
+                        throw new \LengthException('At least four byte needs to be present for successful N / i / s / L decodes');
+                    }
+                    break;
+                case 'Q':
+                    if (strlen($data) < 8) {
+                        throw new \LengthException('At least eight byte needs to be present for successful N / i / s / L decodes');
+                    }
+                    break;
+
+                default:
+                    throw new \InvalidArgumentException('$format contains an invalid character');
+            }
+            switch ($format[$i]) {
+                case 'C':
+                    $result[] = ord(self::shift($data));
+                    continue 2;
+                case 'b':
+                    $result[] = ord(self::shift($data)) != 0;
+                    continue 2;
+                case 'N':
+                    list(, $temp) = unpack('N', self::shift($data, 4));
+                    $result[] = $temp;
+                    continue 2;
+                case 'Q':
+                    // pack() added support for Q in PHP 5.6.3 and PHP 5.6 is phpseclib 3's minimum version
+                    // so in theory we could support this BUT, "64-bit format codes are not available for
+                    // 32-bit versions" and phpseclib works on 32-bit installs. on 32-bit installs
+                    // 64-bit floats can be used to get larger numbers then 32-bit signed ints would allow
+                    // for. sure, you're not gonna get the full precision of 64-bit numbers but just because
+                    // you need > 32-bit precision doesn't mean you need the full 64-bit precision
+                    extract(unpack('Nupper/Nlower', self::shift($data, 8)));
+                    $temp = $upper ? 4294967296 * $upper : 0;
+                    $temp += $lower < 0 ? ($lower & 0x7FFFFFFFF) + 0x80000000 : $lower;
+                    // $temp = hexdec(bin2hex(self::shift($data, 8)));
+                    $result[] = $temp;
+                    continue 2;
+            }
+            list(, $length) = unpack('N', self::shift($data, 4));
+            if (strlen($data) < $length) {
+                throw new \LengthException("$length bytes needed; " . strlen($data) . ' bytes available');
+            }
+            $temp = self::shift($data, $length);
+            switch ($format[$i]) {
+                case 'i':
+                    $result[] = new BigInteger($temp, -256);
+                    break;
+                case 's':
+                    $result[] = $temp;
+                    break;
+                case 'L':
+                    $result[] = explode(',', $temp);
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Create SSH2-style string
+     *
+     * @param string $format
+     * @param string|int|float|array|bool ...$elements
+     * @return string
+     */
+    public static function packSSH2($format, ...$elements)
+    {
+        $format = self::formatPack($format);
+        if (strlen($format) != count($elements)) {
+            throw new \InvalidArgumentException('There must be as many arguments as there are characters in the $format string');
+        }
+        $result = '';
+        for ($i = 0; $i < strlen($format); $i++) {
+            $element = $elements[$i];
+            switch ($format[$i]) {
+                case 'C':
+                    if (!is_int($element)) {
+                        throw new \InvalidArgumentException('Bytes must be represented as an integer between 0 and 255, inclusive.');
+                    }
+                    $result .= pack('C', $element);
+                    break;
+                case 'b':
+                    if (!is_bool($element)) {
+                        throw new \InvalidArgumentException('A boolean parameter was expected.');
+                    }
+                    $result .= $element ? "\1" : "\0";
+                    break;
+                case 'Q':
+                    if (!is_int($element) && !is_float($element)) {
+                        throw new \InvalidArgumentException('An integer was expected.');
+                    }
+                    // 4294967296 == 1 << 32
+                    $result .= pack('NN', $element / 4294967296, $element);
+                    break;
+                case 'N':
+                    if (is_float($element)) {
+                        $element = (int) $element;
+                    }
+                    if (!is_int($element)) {
+                        throw new \InvalidArgumentException('An integer was expected.');
+                    }
+                    $result .= pack('N', $element);
+                    break;
+                case 's':
+                    if (!self::is_stringable($element)) {
+                        throw new \InvalidArgumentException('A string was expected.');
+                    }
+                    $result .= pack('Na*', strlen($element), $element);
+                    break;
+                case 'i':
+                    if (!$element instanceof BigInteger && !$element instanceof FiniteField\Integer) {
+                        throw new \InvalidArgumentException('A phpseclib3\Math\BigInteger or phpseclib3\Math\Common\FiniteField\Integer object was expected.');
+                    }
+                    $element = $element->toBytes(true);
+                    $result .= pack('Na*', strlen($element), $element);
+                    break;
+                case 'L':
+                    if (!is_array($element)) {
+                        throw new \InvalidArgumentException('An array was expected.');
+                    }
+                    $element = implode(',', $element);
+                    $result .= pack('Na*', strlen($element), $element);
+                    break;
+                default:
+                    throw new \InvalidArgumentException('$format contains an invalid character');
+            }
+        }
+        return $result;
+    }
+
+    /**
+     * Expand a pack string
+     *
+     * Converts C5 to CCCCC, for example.
+     *
+     * @param string $format
+     * @return string
+     */
+    private static function formatPack($format)
+    {
+        $parts = preg_split('#(\d+)#', $format, -1, PREG_SPLIT_DELIM_CAPTURE);
+        $format = '';
+        for ($i = 1; $i < count($parts); $i += 2) {
+            $format .= substr($parts[$i - 1], 0, -1) . str_repeat(substr($parts[$i - 1], -1), $parts[$i]);
+        }
+        $format .= $parts[$i - 1];
+
+        return $format;
+    }
+
+    /**
+     * Convert binary data into bits
+     *
+     * bin2hex / hex2bin refer to base-256 encoded data as binary, whilst
+     * decbin / bindec refer to base-2 encoded data as binary. For the purposes
+     * of this function, bin refers to base-256 encoded data whilst bits refers
+     * to base-2 encoded data
+     *
+     * @param string $x
+     * @return string
+     */
+    public static function bits2bin($x)
+    {
+        /*
+        // the pure-PHP approach is faster than the GMP approach
+        if (function_exists('gmp_export')) {
+             return strlen($x) ? gmp_export(gmp_init($x, 2)) : gmp_init(0);
+        }
+        */
+
+        if (preg_match('#[^01]#', $x)) {
+            throw new \RuntimeException('The only valid characters are 0 and 1');
+        }
+
+        if (!defined('PHP_INT_MIN')) {
+            define('PHP_INT_MIN', ~PHP_INT_MAX);
+        }
+
+        $length = strlen($x);
+        if (!$length) {
+            return '';
+        }
+        $block_size = PHP_INT_SIZE << 3;
+        $pad = $block_size - ($length % $block_size);
+        if ($pad != $block_size) {
+            $x = str_repeat('0', $pad) . $x;
+        }
+
+        $parts = str_split($x, $block_size);
+        $str = '';
+        foreach ($parts as $part) {
+            $xor = $part[0] == '1' ? PHP_INT_MIN : 0;
+            $part[0] = '0';
+            $str .= pack(
+                PHP_INT_SIZE == 4 ? 'N' : 'J',
+                $xor ^ eval('return 0b' . $part . ';')
+            );
+        }
+        return ltrim($str, "\0");
+    }
+
+    /**
+     * Convert bits to binary data
+     *
+     * @param string $x
+     * @return string
+     */
+    public static function bin2bits($x, $trim = true)
+    {
+        /*
+        // the pure-PHP approach is slower than the GMP approach BUT
+        // i want to the pure-PHP version to be easily unit tested as well
+        if (function_exists('gmp_import')) {
+            return gmp_strval(gmp_import($x), 2);
+        }
+        */
+
+        $len = strlen($x);
+        $mod = $len % PHP_INT_SIZE;
+        if ($mod) {
+            $x = str_pad($x, $len + PHP_INT_SIZE - $mod, "\0", STR_PAD_LEFT);
+        }
+
+        $bits = '';
+        if (PHP_INT_SIZE == 4) {
+            $digits = unpack('N*', $x);
+            foreach ($digits as $digit) {
+                $bits .= sprintf('%032b', $digit);
+            }
+        } else {
+            $digits = unpack('J*', $x);
+            foreach ($digits as $digit) {
+                $bits .= sprintf('%064b', $digit);
+            }
+        }
+
+        return $trim ? ltrim($bits, '0') : $bits;
+    }
+
+    /**
+     * Switch Endianness Bit Order
+     *
+     * @param string $x
+     * @return string
+     */
+    public static function switchEndianness($x)
+    {
+        $r = '';
+        for ($i = strlen($x) - 1; $i >= 0; $i--) {
+            $b = ord($x[$i]);
+            if (PHP_INT_SIZE === 8) {
+                // 3 operations
+                // from http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith64BitsDiv
+                $r .= chr((($b * 0x0202020202) & 0x010884422010) % 1023);
+            } else {
+                // 7 operations
+                // from http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith32Bits
+                $p1 = ($b * 0x0802) & 0x22110;
+                $p2 = ($b * 0x8020) & 0x88440;
+                $r .= chr(
+                    (($p1 | $p2) * 0x10101) >> 16
+                );
+            }
+        }
+        return $r;
+    }
+
+    /**
+     * Increment the current string
+     *
+     * @param string $var
+     * @return string
+     */
+    public static function increment_str(&$var)
+    {
+        if (function_exists('sodium_increment')) {
+            $var = strrev($var);
+            sodium_increment($var);
+            $var = strrev($var);
+            return $var;
+        }
+
+        for ($i = 4; $i <= strlen($var); $i += 4) {
+            $temp = substr($var, -$i, 4);
+            switch ($temp) {
+                case "\xFF\xFF\xFF\xFF":
+                    $var = substr_replace($var, "\x00\x00\x00\x00", -$i, 4);
+                    break;
+                case "\x7F\xFF\xFF\xFF":
+                    $var = substr_replace($var, "\x80\x00\x00\x00", -$i, 4);
+                    return $var;
+                default:
+                    $temp = unpack('Nnum', $temp);
+                    $var = substr_replace($var, pack('N', $temp['num'] + 1), -$i, 4);
+                    return $var;
+            }
+        }
+
+        $remainder = strlen($var) % 4;
+
+        if ($remainder == 0) {
+            return $var;
+        }
+
+        $temp = unpack('Nnum', str_pad(substr($var, 0, $remainder), 4, "\0", STR_PAD_LEFT));
+        $temp = substr(pack('N', $temp['num'] + 1), -$remainder);
+        $var = substr_replace($var, $temp, 0, $remainder);
+
+        return $var;
+    }
+
+    /**
+     * Find whether the type of a variable is string (or could be converted to one)
+     *
+     * @param mixed $var
+     * @return bool
+     * @psalm-assert-if-true string|\Stringable $var
+     */
+    public static function is_stringable($var)
+    {
+        return is_string($var) || (is_object($var) && method_exists($var, '__toString'));
+    }
+
+    /**
+     * Constant Time Base64-decoding
+     *
+     * ParagoneIE\ConstantTime doesn't use libsodium if it's available so we'll do so
+     * ourselves. see https://github.com/paragonie/constant_time_encoding/issues/39
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function base64_decode($data)
+    {
+        return function_exists('sodium_base642bin') ?
+            sodium_base642bin($data, SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING, '=') :
+            Base64::decode($data);
+    }
+
+    /**
+     * Constant Time Base64-decoding (URL safe)
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function base64url_decode($data)
+    {
+        // return self::base64_decode(str_replace(['-', '_'], ['+', '/'], $data));
+
+        return function_exists('sodium_base642bin') ?
+            sodium_base642bin($data, SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING, '=') :
+            Base64UrlSafe::decode($data);
+    }
+
+    /**
+     * Constant Time Base64-encoding
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function base64_encode($data)
+    {
+        return function_exists('sodium_bin2base64') ?
+            sodium_bin2base64($data, SODIUM_BASE64_VARIANT_ORIGINAL) :
+            Base64::encode($data);
+    }
+
+    /**
+     * Constant Time Base64-encoding (URL safe)
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function base64url_encode($data)
+    {
+        // return str_replace(['+', '/'], ['-', '_'], self::base64_encode($data));
+
+        return function_exists('sodium_bin2base64') ?
+            sodium_bin2base64($data, SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING) :
+            Base64UrlSafe::encode($data);
+    }
+
+    /**
+     * Constant Time Hex Decoder
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function hex2bin($data)
+    {
+        return function_exists('sodium_hex2bin') ?
+            sodium_hex2bin($data) :
+            Hex::decode($data);
+    }
+
+    /**
+     * Constant Time Hex Encoder
+     *
+     * @param string $data
+     * @return string
+     */
+    public static function bin2hex($data)
+    {
+        return function_exists('sodium_bin2hex') ?
+            sodium_bin2hex($data) :
+            Hex::encode($data);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/AES.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/AES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/AES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,116 @@
+<?php
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * Uses mcrypt, if available/possible, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * NOTE: Since AES.php is (for compatibility and phpseclib-historical reasons) virtually
+ * just a wrapper to Rijndael.php you may consider using Rijndael.php instead of
+ * to save one include_once().
+ *
+ * If {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link self::setKey() setKey()}.  ie. if the key is 128-bits, the key length will be 128-bits.  If it's 136-bits
+ * it'll be null-padded to 192-bits and 192 bits will be the key length until {@link self::setKey() setKey()}
+ * is called, again, at which point, it'll be recalculated.
+ *
+ * Since \phpseclib3\Crypt\AES extends \phpseclib3\Crypt\Rijndael, some functions are available to be called that, in the context of AES, don't
+ * make a whole lot of sense.  {@link self::setBlockLength() setBlockLength()}, for instance.  Calling that function,
+ * however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $aes = new \phpseclib3\Crypt\AES('ctr');
+ *
+ *    $aes->setKey('abcdefghijklmnop');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $aes->decrypt($aes->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2008 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class AES extends Rijndael
+{
+    /**
+     * Dummy function
+     *
+     * Since \phpseclib3\Crypt\AES extends \phpseclib3\Crypt\Rijndael, this function is, technically, available, but it doesn't do anything.
+     *
+     * @see \phpseclib3\Crypt\Rijndael::setBlockLength()
+     * @param int $length
+     * @throws \BadMethodCallException anytime it's called
+     */
+    public function setBlockLength($length)
+    {
+        throw new \BadMethodCallException('The block length cannot be set for AES.');
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Valid key lengths are 128, 192, and 256.  Set the link to bool(false) to disable a fixed key length
+     *
+     * @see \phpseclib3\Crypt\Rijndael:setKeyLength()
+     * @param int $length
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKeyLength($length)
+    {
+        switch ($length) {
+            case 128:
+            case 192:
+            case 256:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . $length . ' not supported by this algorithm. Only keys of sizes 128, 192 or 256 supported');
+        }
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Rijndael supports five different key lengths, AES only supports three.
+     *
+     * @see \phpseclib3\Crypt\Rijndael:setKey()
+     * @see setKeyLength()
+     * @param string $key
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKey($key)
+    {
+        switch (strlen($key)) {
+            case 16:
+            case 24:
+            case 32:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported');
+        }
+
+        parent::setKey($key);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Blowfish.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Blowfish.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Blowfish.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,835 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Blowfish.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/Blowfish_(cipher) Wikipedia description of Blowfish}
+ *
+ * # An overview of bcrypt vs Blowfish
+ *
+ * OpenSSH private keys use a customized version of bcrypt. Specifically, instead of
+ * encrypting OrpheanBeholderScryDoubt 64 times OpenSSH's bcrypt variant encrypts
+ * OxychromaticBlowfishSwatDynamite 64 times. so we can't use crypt().
+ *
+ * bcrypt is basically Blowfish but instead of performing the key expansion once it performs
+ * the expansion 129 times for each round, with the first key expansion interleaving the salt
+ * and password. This renders OpenSSL unusable and forces us to use a pure-PHP implementation
+ * of blowfish.
+ *
+ * # phpseclib's four different _encryptBlock() implementations
+ *
+ * When using Blowfish as an encryption algorithm, _encryptBlock() is called 9 + 512 +
+ * (the number of blocks in the plaintext) times.
+ *
+ * Each of the first 9 calls to _encryptBlock() modify the P-array. Each of the next 512
+ * calls modify the S-boxes. The remaining _encryptBlock() calls operate on the plaintext to
+ * produce the ciphertext. In the pure-PHP implementation of Blowfish these remaining
+ * _encryptBlock() calls are highly optimized through the use of eval(). Among other things,
+ * P-array lookups are eliminated by hard-coding the key-dependent P-array values, and thus we
+ * have explained 2 of the 4 different _encryptBlock() implementations.
+ *
+ * With bcrypt things are a bit different. _encryptBlock() is called 1,079,296 times,
+ * assuming 16 rounds (which is what OpenSSH's bcrypt defaults to). The eval()-optimized
+ * _encryptBlock() isn't as beneficial because the P-array values are not constant. Well, they
+ * are constant, but only for, at most, 777 _encryptBlock() calls, which is equivalent to ~6KB
+ * of data. The average length of back to back _encryptBlock() calls with a fixed P-array is
+ * 514.12, which is ~4KB of data. Creating an eval()-optimized _encryptBlock() has an upfront
+ * cost, which is CPU dependent and is probably not going to be worth it for just ~4KB of
+ * data. Conseqeuently, bcrypt does not benefit from the eval()-optimized _encryptBlock().
+ *
+ * The regular _encryptBlock() does unpack() and pack() on every call, as well, and that can
+ * begin to add up after one million function calls.
+ *
+ * In theory, one might think that it might be beneficial to rewrite all block ciphers so
+ * that, instead of passing strings to _encryptBlock(), you convert the string to an array of
+ * integers and then pass successive subarrays of that array to _encryptBlock. This, however,
+ * kills PHP's memory use. Like let's say you have a 1MB long string. After doing
+ * $in = str_repeat('a', 1024 * 1024); PHP's memory utilization jumps up by ~1MB. After doing
+ * $blocks = str_split($in, 4); it jumps up by an additional ~16MB. After
+ * $blocks = array_map(fn($x) => unpack('N*', $x), $blocks); it jumps up by an additional
+ * ~90MB, yielding a 106x increase in memory usage. Consequently, it bcrypt calls a different
+ * _encryptBlock() then the regular Blowfish does. That said, the Blowfish _encryptBlock() is
+ * basically just a thin wrapper around the bcrypt _encryptBlock(), so there's that.
+ *
+ * This explains 3 of the 4 _encryptBlock() implementations. the last _encryptBlock()
+ * implementation can best be understood by doing Ctrl + F and searching for where
+ * self::$use_reg_intval is defined.
+ *
+ * # phpseclib's three different _setupKey() implementations
+ *
+ * Every bcrypt round is the equivalent of encrypting 512KB of data. Since OpenSSH uses 16
+ * rounds by default that's ~8MB of data that's essentially being encrypted whenever
+ * you use bcrypt. That's a lot of data, however, bcrypt operates within tighter constraints
+ * than regular Blowfish, so we can use that to our advantage. In particular, whereas Blowfish
+ * supports variable length keys, in bcrypt, the initial "key" is the sha512 hash of the
+ * password. sha512 hashes are 512 bits or 64 bytes long and thus the bcrypt keys are of a
+ * fixed length whereas Blowfish keys are not of a fixed length.
+ *
+ * bcrypt actually has two different key expansion steps. The first one (expandstate) is
+ * constantly XOR'ing every _encryptBlock() parameter against the salt prior _encryptBlock()'s
+ * being called. The second one (expand0state) is more similar to Blowfish's _setupKey()
+ * but it can still use the fixed length key optimization discussed above and can do away with
+ * the pack() / unpack() calls.
+ *
+ * I suppose _setupKey() could be made to be a thin wrapper around expandstate() but idk it's
+ * just a lot of work for very marginal benefits as _setupKey() is only called once for
+ * regular Blowfish vs the 128 times it's called --per round-- with bcrypt.
+ *
+ * # blowfish + bcrypt in the same class
+ *
+ * Altho there's a lot of Blowfish code that bcrypt doesn't re-use, bcrypt does re-use the
+ * initial S-boxes, the initial P-array and the int-only _encryptBlock() implementation.
+ *
+ * # Credit
+ *
+ * phpseclib's bcrypt implementation is based losely off of OpenSSH's implementation:
+ *
+ * https://github.com/openssh/openssh-portable/blob/master/openbsd-compat/bcrypt_pbkdf.c
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $blowfish = new \phpseclib3\Crypt\Blowfish('ctr');
+ *
+ *    $blowfish->setKey('12345678901234567890123456789012');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $blowfish->decrypt($blowfish->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\BlockCipher;
+
+/**
+ * Pure-PHP implementation of Blowfish.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ */
+class Blowfish extends BlockCipher
+{
+    /**
+     * Block Length of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
+     * @var int
+     */
+    protected $block_size = 8;
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'blowfish';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len
+     * @var int
+     */
+    protected $cfb_init_len = 500;
+
+    /**
+     * The fixed subkeys boxes
+     *
+     * S-Box
+     *
+     * @var    array
+     */
+    private static $sbox = [
+        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
+        0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
+        0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
+        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
+        0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
+        0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
+        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
+        0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
+        0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
+        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
+        0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
+        0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
+        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
+        0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
+        0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
+        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
+        0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
+        0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
+        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
+        0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
+        0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
+        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
+        0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
+        0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
+        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
+        0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
+        0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
+        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
+        0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
+        0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
+        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
+        0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a,
+
+        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
+        0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
+        0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
+        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
+        0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
+        0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
+        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
+        0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
+        0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
+        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
+        0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
+        0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
+        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
+        0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
+        0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
+        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
+        0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
+        0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
+        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
+        0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
+        0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
+        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
+        0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
+        0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
+        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
+        0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
+        0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
+        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
+        0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
+        0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
+        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
+        0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7,
+
+        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
+        0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
+        0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
+        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
+        0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
+        0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
+        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
+        0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
+        0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
+        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
+        0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
+        0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
+        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
+        0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
+        0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
+        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
+        0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
+        0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
+        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
+        0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
+        0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
+        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
+        0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
+        0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
+        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
+        0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
+        0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
+        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
+        0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
+        0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
+        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
+        0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0,
+
+        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
+        0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
+        0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
+        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
+        0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
+        0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
+        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
+        0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
+        0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
+        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
+        0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
+        0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
+        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
+        0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
+        0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
+        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
+        0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
+        0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
+        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
+        0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
+        0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
+        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
+        0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
+        0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
+        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
+        0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
+        0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
+        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
+        0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
+        0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
+        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
+        0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6
+    ];
+
+    /**
+     * P-Array consists of 18 32-bit subkeys
+     *
+     * @var array
+     */
+    private static $parray = [
+        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
+        0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
+        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b
+    ];
+
+    /**
+     * The BCTX-working Array
+     *
+     * Holds the expanded key [p] and the key-depended s-boxes [sb]
+     *
+     * @var array
+     */
+    private $bctx;
+
+    /**
+     * Holds the last used key
+     *
+     * @var array
+     */
+    private $kl;
+
+    /**
+     * The Key Length (in bytes)
+     * {@internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
+     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
+     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.}
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 16;
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $mode
+     * @throws \InvalidArgumentException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        parent::__construct($mode);
+
+        if ($this->mode == self::MODE_STREAM) {
+            throw new \InvalidArgumentException('Block ciphers cannot be ran in stream mode');
+        }
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Key lengths can be between 32 and 448 bits.
+     *
+     * @param int $length
+     */
+    public function setKeyLength($length)
+    {
+        if ($length < 32 || $length > 448) {
+                throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes between 32 and 448 bits are supported');
+        }
+
+        $this->key_length = $length >> 3;
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        if ($engine == self::ENGINE_OPENSSL) {
+            if ($this->key_length < 16) {
+                return false;
+            }
+            // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
+            // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
+            // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
+            if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                return false;
+            }
+            $this->cipher_name_openssl_ecb = 'bf-ecb';
+            $this->cipher_name_openssl = 'bf-' . $this->openssl_translate_mode();
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::_setupKey()
+     */
+    protected function setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
+            // already expanded
+            return;
+        }
+        $this->kl = ['key' => $this->key];
+
+        /* key-expanding p[] and S-Box building sb[] */
+        $this->bctx = [
+            'p'  => [],
+            'sb' => self::$sbox
+        ];
+
+        // unpack binary string in unsigned chars
+        $key  = array_values(unpack('C*', $this->key));
+        $keyl = count($key);
+        // with bcrypt $keyl will always be 16 (because the key is the sha512 of the key you provide)
+        for ($j = 0, $i = 0; $i < 18; ++$i) {
+            // xor P1 with the first 32-bits of the key, xor P2 with the second 32-bits ...
+            for ($data = 0, $k = 0; $k < 4; ++$k) {
+                $data = ($data << 8) | $key[$j];
+                if (++$j >= $keyl) {
+                    $j = 0;
+                }
+            }
+            $this->bctx['p'][] = self::$parray[$i] ^ intval($data);
+        }
+
+        // encrypt the zero-string, replace P1 and P2 with the encrypted data,
+        // encrypt P3 and P4 with the new P1 and P2, do it with all P-array and subkeys
+        $data = "\0\0\0\0\0\0\0\0";
+        for ($i = 0; $i < 18; $i += 2) {
+            list($l, $r) = array_values(unpack('N*', $data = $this->encryptBlock($data)));
+            $this->bctx['p'][$i    ] = $l;
+            $this->bctx['p'][$i + 1] = $r;
+        }
+        for ($i = 0; $i < 0x400; $i += 0x100) {
+            for ($j = 0; $j < 256; $j += 2) {
+                list($l, $r) = array_values(unpack('N*', $data = $this->encryptBlock($data)));
+                $this->bctx['sb'][$i | $j] = $l;
+                $this->bctx['sb'][$i | ($j + 1)] = $r;
+            }
+        }
+    }
+
+    /**
+     * Initialize Static Variables
+     */
+    protected static function initialize_static_variables()
+    {
+        if (is_float(self::$sbox[0x200])) {
+            self::$sbox = array_map('intval', self::$sbox);
+            self::$parray = array_map('intval', self::$parray);
+        }
+
+        parent::initialize_static_variables();
+    }
+
+    /**
+     * bcrypt
+     *
+     * @param string $sha2pass
+     * @param string $sha2salt
+     * @access private
+     * @return string
+     */
+    private static function bcrypt_hash($sha2pass, $sha2salt)
+    {
+        $p = self::$parray;
+        $sbox = self::$sbox;
+
+        $cdata = array_values(unpack('N*', 'OxychromaticBlowfishSwatDynamite'));
+        $sha2pass = array_values(unpack('N*', $sha2pass));
+        $sha2salt = array_values(unpack('N*', $sha2salt));
+
+        self::expandstate($sha2salt, $sha2pass, $sbox, $p);
+        for ($i = 0; $i < 64; $i++) {
+            self::expand0state($sha2salt, $sbox, $p);
+            self::expand0state($sha2pass, $sbox, $p);
+        }
+
+        for ($i = 0; $i < 64; $i++) {
+            for ($j = 0; $j < 8; $j += 2) { // count($cdata) == 8
+                list($cdata[$j], $cdata[$j + 1]) = self::encryptBlockHelperFast($cdata[$j], $cdata[$j + 1], $sbox, $p);
+            }
+        }
+
+        return pack('V*', ...$cdata);
+    }
+
+    /**
+     * Performs OpenSSH-style bcrypt
+     *
+     * @param string $pass
+     * @param string $salt
+     * @param int $keylen
+     * @param int $rounds
+     * @access public
+     * @return string
+     */
+    public static function bcrypt_pbkdf($pass, $salt, $keylen, $rounds)
+    {
+        self::initialize_static_variables();
+
+        if (PHP_INT_SIZE == 4) {
+            throw new \RuntimeException('bcrypt is far too slow to be practical on 32-bit versions of PHP');
+        }
+
+        $sha2pass = hash('sha512', $pass, true);
+        $results = [];
+        $count = 1;
+        while (32 * count($results) < $keylen) {
+            $countsalt = $salt . pack('N', $count++);
+            $sha2salt = hash('sha512', $countsalt, true);
+            $out = $tmpout = self::bcrypt_hash($sha2pass, $sha2salt);
+            for ($i = 1; $i < $rounds; $i++) {
+                $sha2salt = hash('sha512', $tmpout, true);
+                $tmpout = self::bcrypt_hash($sha2pass, $sha2salt);
+                $out ^= $tmpout;
+            }
+            $results[] = $out;
+        }
+        $output = '';
+        for ($i = 0; $i < 32; $i++) {
+            foreach ($results as $result) {
+                $output .= $result[$i];
+            }
+        }
+        return substr($output, 0, $keylen);
+    }
+
+    /**
+     * Key expansion without salt
+     *
+     * @access private
+     * @param int[] $key
+     * @param int[] $sbox
+     * @param int[] $p
+     * @see self::_bcrypt_hash()
+     */
+    private static function expand0state(array $key, array &$sbox, array &$p)
+    {
+        // expand0state is basically the same thing as this:
+        //return self::expandstate(array_fill(0, 16, 0), $key);
+        // but this separate function eliminates a bunch of XORs and array lookups
+
+        $p = [
+            $p[0] ^ $key[0],
+            $p[1] ^ $key[1],
+            $p[2] ^ $key[2],
+            $p[3] ^ $key[3],
+            $p[4] ^ $key[4],
+            $p[5] ^ $key[5],
+            $p[6] ^ $key[6],
+            $p[7] ^ $key[7],
+            $p[8] ^ $key[8],
+            $p[9] ^ $key[9],
+            $p[10] ^ $key[10],
+            $p[11] ^ $key[11],
+            $p[12] ^ $key[12],
+            $p[13] ^ $key[13],
+            $p[14] ^ $key[14],
+            $p[15] ^ $key[15],
+            $p[16] ^ $key[0],
+            $p[17] ^ $key[1]
+        ];
+
+        // @codingStandardsIgnoreStart
+        list( $p[0],  $p[1]) = self::encryptBlockHelperFast(     0,      0, $sbox, $p);
+        list( $p[2],  $p[3]) = self::encryptBlockHelperFast($p[ 0], $p[ 1], $sbox, $p);
+        list( $p[4],  $p[5]) = self::encryptBlockHelperFast($p[ 2], $p[ 3], $sbox, $p);
+        list( $p[6],  $p[7]) = self::encryptBlockHelperFast($p[ 4], $p[ 5], $sbox, $p);
+        list( $p[8],  $p[9]) = self::encryptBlockHelperFast($p[ 6], $p[ 7], $sbox, $p);
+        list($p[10], $p[11]) = self::encryptBlockHelperFast($p[ 8], $p[ 9], $sbox, $p);
+        list($p[12], $p[13]) = self::encryptBlockHelperFast($p[10], $p[11], $sbox, $p);
+        list($p[14], $p[15]) = self::encryptBlockHelperFast($p[12], $p[13], $sbox, $p);
+        list($p[16], $p[17]) = self::encryptBlockHelperFast($p[14], $p[15], $sbox, $p);
+        // @codingStandardsIgnoreEnd
+
+        list($sbox[0], $sbox[1]) = self::encryptBlockHelperFast($p[16], $p[17], $sbox, $p);
+        for ($i = 2; $i < 1024; $i += 2) {
+            list($sbox[$i], $sbox[$i + 1]) = self::encryptBlockHelperFast($sbox[$i - 2], $sbox[$i - 1], $sbox, $p);
+        }
+    }
+
+    /**
+     * Key expansion with salt
+     *
+     * @access private
+     * @param int[] $data
+     * @param int[] $key
+     * @param int[] $sbox
+     * @param int[] $p
+     * @see self::_bcrypt_hash()
+     */
+    private static function expandstate(array $data, array $key, array &$sbox, array &$p)
+    {
+        $p = [
+            $p[0] ^ $key[0],
+            $p[1] ^ $key[1],
+            $p[2] ^ $key[2],
+            $p[3] ^ $key[3],
+            $p[4] ^ $key[4],
+            $p[5] ^ $key[5],
+            $p[6] ^ $key[6],
+            $p[7] ^ $key[7],
+            $p[8] ^ $key[8],
+            $p[9] ^ $key[9],
+            $p[10] ^ $key[10],
+            $p[11] ^ $key[11],
+            $p[12] ^ $key[12],
+            $p[13] ^ $key[13],
+            $p[14] ^ $key[14],
+            $p[15] ^ $key[15],
+            $p[16] ^ $key[0],
+            $p[17] ^ $key[1]
+        ];
+
+        // @codingStandardsIgnoreStart
+        list( $p[0],  $p[1]) = self::encryptBlockHelperFast($data[ 0]         , $data[ 1]         , $sbox, $p);
+        list( $p[2],  $p[3]) = self::encryptBlockHelperFast($data[ 2] ^ $p[ 0], $data[ 3] ^ $p[ 1], $sbox, $p);
+        list( $p[4],  $p[5]) = self::encryptBlockHelperFast($data[ 4] ^ $p[ 2], $data[ 5] ^ $p[ 3], $sbox, $p);
+        list( $p[6],  $p[7]) = self::encryptBlockHelperFast($data[ 6] ^ $p[ 4], $data[ 7] ^ $p[ 5], $sbox, $p);
+        list( $p[8],  $p[9]) = self::encryptBlockHelperFast($data[ 8] ^ $p[ 6], $data[ 9] ^ $p[ 7], $sbox, $p);
+        list($p[10], $p[11]) = self::encryptBlockHelperFast($data[10] ^ $p[ 8], $data[11] ^ $p[ 9], $sbox, $p);
+        list($p[12], $p[13]) = self::encryptBlockHelperFast($data[12] ^ $p[10], $data[13] ^ $p[11], $sbox, $p);
+        list($p[14], $p[15]) = self::encryptBlockHelperFast($data[14] ^ $p[12], $data[15] ^ $p[13], $sbox, $p);
+        list($p[16], $p[17]) = self::encryptBlockHelperFast($data[ 0] ^ $p[14], $data[ 1] ^ $p[15], $sbox, $p);
+        // @codingStandardsIgnoreEnd
+
+        list($sbox[0], $sbox[1]) = self::encryptBlockHelperFast($data[2] ^ $p[16], $data[3] ^ $p[17], $sbox, $p);
+        for ($i = 2, $j = 4; $i < 1024; $i += 2, $j = ($j + 2) % 16) { // instead of 16 maybe count($data) would be better?
+            list($sbox[$i], $sbox[$i + 1]) = self::encryptBlockHelperFast($data[$j] ^ $sbox[$i - 2], $data[$j + 1] ^ $sbox[$i - 1], $sbox, $p);
+        }
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function encryptBlock($in)
+    {
+        $p = $this->bctx['p'];
+        // extract($this->bctx['sb'], EXTR_PREFIX_ALL, 'sb'); // slower
+        $sb = $this->bctx['sb'];
+
+        $in = unpack('N*', $in);
+        $l = $in[1];
+        $r = $in[2];
+
+        list($r, $l) = PHP_INT_SIZE == 4 ?
+            self::encryptBlockHelperSlow($l, $r, $sb, $p) :
+            self::encryptBlockHelperFast($l, $r, $sb, $p);
+
+        return pack("N*", $r, $l);
+    }
+
+    /**
+     * Fast helper function for block encryption
+     *
+     * @access private
+     * @param int $x0
+     * @param int $x1
+     * @param int[] $sbox
+     * @param int[] $p
+     * @return int[]
+     */
+    private static function encryptBlockHelperFast($x0, $x1, array $sbox, array $p)
+    {
+        $x0 ^= $p[0];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[1];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[2];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[3];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[4];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[5];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[6];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[7];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[8];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[9];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[10];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[11];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[12];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[13];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[14];
+        $x1 ^= ((($sbox[($x0 & 0xFF000000) >> 24] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[15];
+        $x0 ^= ((($sbox[($x1 & 0xFF000000) >> 24] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[16];
+
+        return [$x1 & 0xFFFFFFFF ^ $p[17], $x0 & 0xFFFFFFFF];
+    }
+
+    /**
+     * Slow helper function for block encryption
+     *
+     * @access private
+     * @param int $x0
+     * @param int $x1
+     * @param int[] $sbox
+     * @param int[] $p
+     * @return int[]
+     */
+    private static function encryptBlockHelperSlow($x0, $x1, array $sbox, array $p)
+    {
+        // -16777216 == intval(0xFF000000) on 32-bit PHP installs
+        $x0 ^= $p[0];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[1];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[2];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[3];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[4];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[5];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[6];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[7];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[8];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[9];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[10];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[11];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[12];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[13];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[14];
+        $x1 ^= self::safe_intval((self::safe_intval($sbox[(($x0 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x0 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x0 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x0 & 0xFF)]) ^ $p[15];
+        $x0 ^= self::safe_intval((self::safe_intval($sbox[(($x1 & -16777216) >> 24) & 0xFF] + $sbox[0x100 | (($x1 & 0xFF0000) >> 16)]) ^ $sbox[0x200 | (($x1 & 0xFF00) >> 8)]) + $sbox[0x300 | ($x1 & 0xFF)]) ^ $p[16];
+
+        return [$x1 ^ $p[17], $x0];
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function decryptBlock($in)
+    {
+        $p = $this->bctx['p'];
+        $sb = $this->bctx['sb'];
+
+        $in = unpack('N*', $in);
+        $l = $in[1];
+        $r = $in[2];
+
+        for ($i = 17; $i > 2; $i -= 2) {
+            $l ^= $p[$i];
+            $r ^= self::safe_intval((self::safe_intval($sb[$l >> 24 & 0xff] + $sb[0x100 + ($l >> 16 & 0xff)]) ^
+                  $sb[0x200 + ($l >>  8 & 0xff)]) +
+                  $sb[0x300 + ($l       & 0xff)]);
+
+            $r ^= $p[$i - 1];
+            $l ^= self::safe_intval((self::safe_intval($sb[$r >> 24 & 0xff] + $sb[0x100 + ($r >> 16 & 0xff)]) ^
+                  $sb[0x200 + ($r >>  8 & 0xff)]) +
+                  $sb[0x300 + ($r       & 0xff)]);
+        }
+        return pack('N*', $r ^ $p[0], $l ^ $p[1]);
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::_setupInlineCrypt()
+     */
+    protected function setupInlineCrypt()
+    {
+        $p = $this->bctx['p'];
+        $init_crypt = '
+            static $sb;
+            if (!$sb) {
+                $sb = $this->bctx["sb"];
+            }
+        ';
+
+        $safeint = self::safe_intval_inline();
+
+        // Generating encrypt code:
+        $encrypt_block = '
+            $in = unpack("N*", $in);
+            $l = $in[1];
+            $r = $in[2];
+        ';
+        for ($i = 0; $i < 16; $i += 2) {
+            $encrypt_block .= '
+                $l^= ' . $p[$i] . ';
+                $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb[$l >> 24 & 0xff] + $sb[0x100 + ($l >> 16 & 0xff)]') . ' ^
+                      $sb[0x200 + ($l >>  8 & 0xff)]) +
+                      $sb[0x300 + ($l       & 0xff)]') . ';
+
+                $r^= ' . $p[$i + 1] . ';
+                $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb[$r >> 24 & 0xff] + $sb[0x100 + ($r >> 16 & 0xff)]') . '  ^
+                      $sb[0x200 + ($r >>  8 & 0xff)]) +
+                      $sb[0x300 + ($r       & 0xff)]') . ';
+            ';
+        }
+        $encrypt_block .= '
+            $in = pack("N*",
+                $r ^ ' . $p[17] . ',
+                $l ^ ' . $p[16] . '
+            );
+        ';
+         // Generating decrypt code:
+        $decrypt_block = '
+            $in = unpack("N*", $in);
+            $l = $in[1];
+            $r = $in[2];
+        ';
+
+        for ($i = 17; $i > 2; $i -= 2) {
+            $decrypt_block .= '
+                $l^= ' . $p[$i] . ';
+                $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb[$l >> 24 & 0xff] + $sb[0x100 + ($l >> 16 & 0xff)]') . ' ^
+                      $sb[0x200 + ($l >>  8 & 0xff)]) +
+                      $sb[0x300 + ($l       & 0xff)]') . ';
+
+                $r^= ' . $p[$i - 1] . ';
+                $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb[$r >> 24 & 0xff] + $sb[0x100 + ($r >> 16 & 0xff)]') . ' ^
+                      $sb[0x200 + ($r >>  8 & 0xff)]) +
+                      $sb[0x300 + ($r       & 0xff)]') . ';
+            ';
+        }
+
+        $decrypt_block .= '
+            $in = pack("N*",
+                $r ^ ' . $p[0] . ',
+                $l ^ ' . $p[1] . '
+            );
+        ';
+
+        $this->inline_crypt = $this->createInlineCryptFunction(
+            [
+               'init_crypt'    => $init_crypt,
+               'init_encrypt'  => '',
+               'init_decrypt'  => '',
+               'encrypt_block' => $encrypt_block,
+               'decrypt_block' => $decrypt_block
+            ]
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/ChaCha20.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/ChaCha20.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/ChaCha20.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,799 @@
+<?php
+
+/**
+ * Pure-PHP implementation of ChaCha20.
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2019 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Exception\BadDecryptionException;
+use phpseclib3\Exception\InsufficientSetupException;
+
+/**
+ * Pure-PHP implementation of ChaCha20.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class ChaCha20 extends Salsa20
+{
+    /**
+     * The OpenSSL specific name of the cipher
+     *
+     * @var string
+     */
+    protected $cipher_name_openssl = 'chacha20';
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        switch ($engine) {
+            case self::ENGINE_LIBSODIUM:
+                // PHP 7.2.0 (30 Nov 2017) added support for libsodium
+
+                // we could probably make it so that if $this->counter == 0 then the first block would be done with either OpenSSL
+                // or PHP and then subsequent blocks would then be done with libsodium but idk - it's not a high priority atm
+
+                // we could also make it so that if $this->counter == 0 and $this->continuousBuffer then do the first string
+                // with libsodium and subsequent strings with openssl or pure-PHP but again not a high priority
+                return function_exists('sodium_crypto_aead_chacha20poly1305_ietf_encrypt') &&
+                       $this->key_length == 32 &&
+                       (($this->usePoly1305 && !isset($this->poly1305Key) && $this->counter == 0) || $this->counter == 1) &&
+                       !$this->continuousBuffer;
+            case self::ENGINE_OPENSSL:
+                // OpenSSL 1.1.0 (released 25 Aug 2016) added support for chacha20.
+                // PHP didn't support OpenSSL 1.1.0 until 7.0.19 (11 May 2017)
+
+                // if you attempt to provide openssl with a 128 bit key (as opposed to a 256 bit key) openssl will null
+                // pad the key to 256 bits and still use the expansion constant for 256-bit keys. the fact that
+                // openssl treats the IV as both the counter and nonce, however, let's us use openssl in continuous mode
+                // whereas libsodium does not
+                if ($this->key_length != 32) {
+                    return false;
+                }
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @see self::crypt()
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    public function encrypt($plaintext)
+    {
+        $this->setup();
+
+        if ($this->engine == self::ENGINE_LIBSODIUM) {
+            return $this->encrypt_with_libsodium($plaintext);
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
+     * At least if the continuous buffer is disabled.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see self::crypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    public function decrypt($ciphertext)
+    {
+        $this->setup();
+
+        if ($this->engine == self::ENGINE_LIBSODIUM) {
+            return $this->decrypt_with_libsodium($ciphertext);
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+
+    /**
+     * Encrypts a message with libsodium
+     *
+     * @see self::encrypt()
+     * @param string $plaintext
+     * @return string $text
+     */
+    private function encrypt_with_libsodium($plaintext)
+    {
+        $params = [$plaintext, $this->aad, $this->nonce, $this->key];
+        $ciphertext = strlen($this->nonce) == 8 ?
+            sodium_crypto_aead_chacha20poly1305_encrypt(...$params) :
+            sodium_crypto_aead_chacha20poly1305_ietf_encrypt(...$params);
+        if (!$this->usePoly1305) {
+            return substr($ciphertext, 0, strlen($plaintext));
+        }
+
+        $newciphertext = substr($ciphertext, 0, strlen($plaintext));
+
+        $this->newtag = $this->usingGeneratedPoly1305Key && strlen($this->nonce) == 12 ?
+            substr($ciphertext, strlen($plaintext)) :
+            $this->poly1305($newciphertext);
+
+        return $newciphertext;
+    }
+
+    /**
+     * Decrypts a message with libsodium
+     *
+     * @see self::decrypt()
+     * @param string $ciphertext
+     * @return string $text
+     */
+    private function decrypt_with_libsodium($ciphertext)
+    {
+        $params = [$ciphertext, $this->aad, $this->nonce, $this->key];
+
+        if (isset($this->poly1305Key)) {
+            if ($this->oldtag === false) {
+                throw new InsufficientSetupException('Authentication Tag has not been set');
+            }
+            if ($this->usingGeneratedPoly1305Key && strlen($this->nonce) == 12) {
+                $plaintext = sodium_crypto_aead_chacha20poly1305_ietf_decrypt(...$params);
+                $this->oldtag = false;
+                if ($plaintext === false) {
+                    throw new BadDecryptionException('Derived authentication tag and supplied authentication tag do not match');
+                }
+                return $plaintext;
+            }
+            $newtag = $this->poly1305($ciphertext);
+            if ($this->oldtag != substr($newtag, 0, strlen($this->oldtag))) {
+                $this->oldtag = false;
+                throw new BadDecryptionException('Derived authentication tag and supplied authentication tag do not match');
+            }
+            $this->oldtag = false;
+        }
+
+        $plaintext = strlen($this->nonce) == 8 ?
+            sodium_crypto_aead_chacha20poly1305_encrypt(...$params) :
+            sodium_crypto_aead_chacha20poly1305_ietf_encrypt(...$params);
+
+        return substr($plaintext, 0, strlen($ciphertext));
+    }
+
+    /**
+     * Sets the nonce.
+     *
+     * @param string $nonce
+     */
+    public function setNonce($nonce)
+    {
+        if (!is_string($nonce)) {
+            throw new \UnexpectedValueException('The nonce should be a string');
+        }
+
+        /*
+          from https://tools.ietf.org/html/rfc7539#page-7
+
+          "Note also that the original ChaCha had a 64-bit nonce and 64-bit
+           block count.  We have modified this here to be more consistent with
+           recommendations in Section 3.2 of [RFC5116]."
+         */
+        switch (strlen($nonce)) {
+            case 8:  // 64 bits
+            case 12: // 96 bits
+                break;
+            default:
+                throw new \LengthException('Nonce of size ' . strlen($nonce) . ' not supported by this algorithm. Only 64-bit nonces or 96-bit nonces are supported');
+        }
+
+        $this->nonce = $nonce;
+        $this->changed = true;
+        $this->setEngine();
+    }
+
+    /**
+     * Setup the self::ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine
+     *
+     * _setup() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setNonce()
+     *
+     * - First run of encrypt() / decrypt() with no init-settings
+     *
+     * @see self::setKey()
+     * @see self::setNonce()
+     * @see self::disableContinuousBuffer()
+     */
+    protected function setup()
+    {
+        if (!$this->changed) {
+            return;
+        }
+
+        $this->enbuffer = $this->debuffer = ['ciphertext' => '', 'counter' => $this->counter];
+
+        $this->changed = $this->nonIVChanged = false;
+
+        if ($this->nonce === false) {
+            throw new InsufficientSetupException('No nonce has been defined');
+        }
+
+        if ($this->key === false) {
+            throw new InsufficientSetupException('No key has been defined');
+        }
+
+        if ($this->usePoly1305 && !isset($this->poly1305Key)) {
+            $this->usingGeneratedPoly1305Key = true;
+            if ($this->engine == self::ENGINE_LIBSODIUM) {
+                return;
+            }
+            $this->createPoly1305Key();
+        }
+
+        $key = $this->key;
+        if (strlen($key) == 16) {
+            $constant = 'expand 16-byte k';
+            $key .= $key;
+        } else {
+            $constant = 'expand 32-byte k';
+        }
+
+        $this->p1 = $constant . $key;
+        $this->p2 = $this->nonce;
+        if (strlen($this->nonce) == 8) {
+            $this->p2 = "\0\0\0\0" . $this->p2;
+        }
+    }
+
+    /**
+     * The quarterround function
+     *
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     */
+    protected static function quarterRound(&$a, &$b, &$c, &$d)
+    {
+        // in https://datatracker.ietf.org/doc/html/rfc7539#section-2.1 the addition,
+        // xor'ing and rotation are all on the same line so i'm keeping it on the same
+        // line here as well
+        // @codingStandardsIgnoreStart
+        $a+= $b; $d = self::leftRotate(intval($d) ^ intval($a), 16);
+        $c+= $d; $b = self::leftRotate(intval($b) ^ intval($c), 12);
+        $a+= $b; $d = self::leftRotate(intval($d) ^ intval($a), 8);
+        $c+= $d; $b = self::leftRotate(intval($b) ^ intval($c), 7);
+        // @codingStandardsIgnoreEnd
+    }
+
+    /**
+     * The doubleround function
+     *
+     * @param int $x0 (by reference)
+     * @param int $x1 (by reference)
+     * @param int $x2 (by reference)
+     * @param int $x3 (by reference)
+     * @param int $x4 (by reference)
+     * @param int $x5 (by reference)
+     * @param int $x6 (by reference)
+     * @param int $x7 (by reference)
+     * @param int $x8 (by reference)
+     * @param int $x9 (by reference)
+     * @param int $x10 (by reference)
+     * @param int $x11 (by reference)
+     * @param int $x12 (by reference)
+     * @param int $x13 (by reference)
+     * @param int $x14 (by reference)
+     * @param int $x15 (by reference)
+     */
+    protected static function doubleRound(&$x0, &$x1, &$x2, &$x3, &$x4, &$x5, &$x6, &$x7, &$x8, &$x9, &$x10, &$x11, &$x12, &$x13, &$x14, &$x15)
+    {
+        // columnRound
+        static::quarterRound($x0, $x4, $x8, $x12);
+        static::quarterRound($x1, $x5, $x9, $x13);
+        static::quarterRound($x2, $x6, $x10, $x14);
+        static::quarterRound($x3, $x7, $x11, $x15);
+        // rowRound
+        static::quarterRound($x0, $x5, $x10, $x15);
+        static::quarterRound($x1, $x6, $x11, $x12);
+        static::quarterRound($x2, $x7, $x8, $x13);
+        static::quarterRound($x3, $x4, $x9, $x14);
+    }
+
+    /**
+     * The Salsa20 hash function function
+     *
+     * On my laptop this loop unrolled / function dereferenced version of parent::salsa20 encrypts 1mb of text in
+     * 0.65s vs the 0.85s that it takes with the parent method.
+     *
+     * If we were free to assume that the host OS would always be 64-bits then the if condition in leftRotate could
+     * be eliminated and we could knock this done to 0.60s.
+     *
+     * For comparison purposes, RC4 takes 0.16s and AES in CTR mode with the Eval engine takes 0.48s.
+     * AES in CTR mode with the PHP engine takes 1.19s. Salsa20 / ChaCha20 do not benefit as much from the Eval
+     * approach due to the fact that there are a lot less variables to de-reference, fewer loops to unroll, etc
+     *
+     * @param string $x
+     */
+    protected static function salsa20($x)
+    {
+        list(, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15) = unpack('V*', $x);
+        $z0 = $x0;
+        $z1 = $x1;
+        $z2 = $x2;
+        $z3 = $x3;
+        $z4 = $x4;
+        $z5 = $x5;
+        $z6 = $x6;
+        $z7 = $x7;
+        $z8 = $x8;
+        $z9 = $x9;
+        $z10 = $x10;
+        $z11 = $x11;
+        $z12 = $x12;
+        $z13 = $x13;
+        $z14 = $x14;
+        $z15 = $x15;
+
+        // @codingStandardsIgnoreStart
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+
+        // columnRound
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 16);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 12);
+        $x0+= $x4; $x12 = self::leftRotate(intval($x12) ^ intval($x0), 8);
+        $x8+= $x12; $x4 = self::leftRotate(intval($x4) ^ intval($x8), 7);
+
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 16);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 12);
+        $x1+= $x5; $x13 = self::leftRotate(intval($x13) ^ intval($x1), 8);
+        $x9+= $x13; $x5 = self::leftRotate(intval($x5) ^ intval($x9), 7);
+
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 16);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 12);
+        $x2+= $x6; $x14 = self::leftRotate(intval($x14) ^ intval($x2), 8);
+        $x10+= $x14; $x6 = self::leftRotate(intval($x6) ^ intval($x10), 7);
+
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 16);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 12);
+        $x3+= $x7; $x15 = self::leftRotate(intval($x15) ^ intval($x3), 8);
+        $x11+= $x15; $x7 = self::leftRotate(intval($x7) ^ intval($x11), 7);
+
+        // rowRound
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 16);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 12);
+        $x0+= $x5; $x15 = self::leftRotate(intval($x15) ^ intval($x0), 8);
+        $x10+= $x15; $x5 = self::leftRotate(intval($x5) ^ intval($x10), 7);
+
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 16);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 12);
+        $x1+= $x6; $x12 = self::leftRotate(intval($x12) ^ intval($x1), 8);
+        $x11+= $x12; $x6 = self::leftRotate(intval($x6) ^ intval($x11), 7);
+
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 16);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 12);
+        $x2+= $x7; $x13 = self::leftRotate(intval($x13) ^ intval($x2), 8);
+        $x8+= $x13; $x7 = self::leftRotate(intval($x7) ^ intval($x8), 7);
+
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 16);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 12);
+        $x3+= $x4; $x14 = self::leftRotate(intval($x14) ^ intval($x3), 8);
+        $x9+= $x14; $x4 = self::leftRotate(intval($x4) ^ intval($x9), 7);
+        // @codingStandardsIgnoreEnd
+
+        $x0 += $z0;
+        $x1 += $z1;
+        $x2 += $z2;
+        $x3 += $z3;
+        $x4 += $z4;
+        $x5 += $z5;
+        $x6 += $z6;
+        $x7 += $z7;
+        $x8 += $z8;
+        $x9 += $z9;
+        $x10 += $z10;
+        $x11 += $z11;
+        $x12 += $z12;
+        $x13 += $z13;
+        $x14 += $z14;
+        $x15 += $z15;
+
+        return pack('V*', $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/AsymmetricKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/AsymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/AsymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,581 @@
+<?php
+
+/**
+ * Base Class for all asymmetric key ciphers
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Exception\NoKeyLoadedException;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Base Class for all asymmetric cipher classes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AsymmetricKey
+{
+    /**
+     * Precomputed Zero
+     *
+     * @var BigInteger
+     */
+    protected static $zero;
+
+    /**
+     * Precomputed One
+     *
+     * @var BigInteger
+     */
+    protected static $one;
+
+    /**
+     * Format of the loaded key
+     *
+     * @var string
+     */
+    protected $format;
+
+    /**
+     * Hash function
+     *
+     * @var Hash
+     */
+    protected $hash;
+
+    /**
+     * HMAC function
+     *
+     * @var Hash
+     */
+    private $hmac;
+
+    /**
+     * Supported plugins (lower case)
+     *
+     * @see self::initialize_static_variables()
+     * @var array
+     */
+    private static $plugins = [];
+
+    /**
+     * Invisible plugins
+     *
+     * @see self::initialize_static_variables()
+     * @var array
+     */
+    private static $invisiblePlugins = [];
+
+    /**
+     * Available Engines
+     *
+     * @var boolean[]
+     */
+    protected static $engines = [];
+
+    /**
+     * Key Comment
+     *
+     * @var null|string
+     */
+    private $comment;
+
+    /**
+     * @param string $type
+     * @return array|string
+     */
+    abstract public function toString($type, array $options = []);
+
+    /**
+     * The constructor
+     */
+    protected function __construct()
+    {
+        self::initialize_static_variables();
+
+        $this->hash = new Hash('sha256');
+        $this->hmac = new Hash('sha256');
+    }
+
+    /**
+     * Initialize static variables
+     */
+    protected static function initialize_static_variables()
+    {
+        if (!isset(self::$zero)) {
+            self::$zero = new BigInteger(0);
+            self::$one = new BigInteger(1);
+        }
+
+        self::loadPlugins('Keys');
+        if (static::ALGORITHM != 'RSA' && static::ALGORITHM != 'DH') {
+            self::loadPlugins('Signature');
+        }
+    }
+
+    /**
+     * Load the key
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return PublicKey|PrivateKey
+     */
+    public static function load($key, $password = false)
+    {
+        self::initialize_static_variables();
+
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('load() should not be called from final classes (' . static::class . ')');
+        }
+
+        $components = false;
+        foreach (self::$plugins[static::ALGORITHM]['Keys'] as $format) {
+            if (isset(self::$invisiblePlugins[static::ALGORITHM]) && in_array($format, self::$invisiblePlugins[static::ALGORITHM])) {
+                continue;
+            }
+            try {
+                $components = $format::load($key, $password);
+            } catch (\Exception $e) {
+                $components = false;
+            }
+            if ($components !== false) {
+                break;
+            }
+        }
+
+        if ($components === false) {
+            throw new NoKeyLoadedException('Unable to read key');
+        }
+
+        $components['format'] = $format;
+        $components['secret'] = isset($components['secret']) ? $components['secret'] : '';
+        $comment = isset($components['comment']) ? $components['comment'] : null;
+        $new = static::onLoad($components);
+        $new->format = $format;
+        $new->comment = $comment;
+        return $new instanceof PrivateKey ?
+            $new->withPassword($password) :
+            $new;
+    }
+
+    /**
+     * Loads a private key
+     *
+     * @return PrivateKey
+     * @param string|array $key
+     * @param string $password optional
+     */
+    public static function loadPrivateKey($key, $password = '')
+    {
+        $key = self::load($key, $password);
+        if (!$key instanceof PrivateKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a private key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads a public key
+     *
+     * @return PublicKey
+     * @param string|array $key
+     */
+    public static function loadPublicKey($key)
+    {
+        $key = self::load($key);
+        if (!$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a public key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads parameters
+     *
+     * @return AsymmetricKey
+     * @param string|array $key
+     */
+    public static function loadParameters($key)
+    {
+        $key = self::load($key);
+        if (!$key instanceof PrivateKey && !$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a parameter');
+        }
+        return $key;
+    }
+
+    /**
+     * Load the key, assuming a specific format
+     *
+     * @param string $type
+     * @param string $key
+     * @param string $password optional
+     * @return static
+     */
+    public static function loadFormat($type, $key, $password = false)
+    {
+        self::initialize_static_variables();
+
+        $components = false;
+        $format = strtolower($type);
+        if (isset(self::$plugins[static::ALGORITHM]['Keys'][$format])) {
+            $format = self::$plugins[static::ALGORITHM]['Keys'][$format];
+            $components = $format::load($key, $password);
+        }
+
+        if ($components === false) {
+            throw new NoKeyLoadedException('Unable to read key');
+        }
+
+        $components['format'] = $format;
+        $components['secret'] = isset($components['secret']) ? $components['secret'] : '';
+
+        $new = static::onLoad($components);
+        $new->format = $format;
+        return $new instanceof PrivateKey ?
+            $new->withPassword($password) :
+            $new;
+    }
+
+    /**
+     * Loads a private key
+     *
+     * @return PrivateKey
+     * @param string $type
+     * @param string $key
+     * @param string $password optional
+     */
+    public static function loadPrivateKeyFormat($type, $key, $password = false)
+    {
+        $key = self::loadFormat($type, $key, $password);
+        if (!$key instanceof PrivateKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a private key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads a public key
+     *
+     * @return PublicKey
+     * @param string $type
+     * @param string $key
+     */
+    public static function loadPublicKeyFormat($type, $key)
+    {
+        $key = self::loadFormat($type, $key);
+        if (!$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a public key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads parameters
+     *
+     * @return AsymmetricKey
+     * @param string $type
+     * @param string|array $key
+     */
+    public static function loadParametersFormat($type, $key)
+    {
+        $key = self::loadFormat($type, $key);
+        if (!$key instanceof PrivateKey && !$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a parameter');
+        }
+        return $key;
+    }
+
+    /**
+     * Validate Plugin
+     *
+     * @param string $format
+     * @param string $type
+     * @param string $method optional
+     * @return mixed
+     */
+    protected static function validatePlugin($format, $type, $method = null)
+    {
+        $type = strtolower($type);
+        if (!isset(self::$plugins[static::ALGORITHM][$format][$type])) {
+            throw new UnsupportedFormatException("$type is not a supported format");
+        }
+        $type = self::$plugins[static::ALGORITHM][$format][$type];
+        if (isset($method) && !method_exists($type, $method)) {
+            throw new UnsupportedFormatException("$type does not implement $method");
+        }
+
+        return $type;
+    }
+
+    /**
+     * Load Plugins
+     *
+     * @param string $format
+     */
+    private static function loadPlugins($format)
+    {
+        if (!isset(self::$plugins[static::ALGORITHM][$format])) {
+            self::$plugins[static::ALGORITHM][$format] = [];
+            foreach (new \DirectoryIterator(__DIR__ . '/../' . static::ALGORITHM . '/Formats/' . $format . '/') as $file) {
+                if ($file->getExtension() != 'php') {
+                    continue;
+                }
+                $name = $file->getBasename('.php');
+                if ($name[0] == '.') {
+                    continue;
+                }
+                $type = 'phpseclib3\Crypt\\' . static::ALGORITHM . '\\Formats\\' . $format . '\\' . $name;
+                $reflect = new \ReflectionClass($type);
+                if ($reflect->isTrait()) {
+                    continue;
+                }
+                self::$plugins[static::ALGORITHM][$format][strtolower($name)] = $type;
+                if ($reflect->hasConstant('IS_INVISIBLE')) {
+                    self::$invisiblePlugins[static::ALGORITHM][] = $type;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a list of supported formats.
+     *
+     * @return array
+     */
+    public static function getSupportedKeyFormats()
+    {
+        self::initialize_static_variables();
+
+        return self::$plugins[static::ALGORITHM]['Keys'];
+    }
+
+    /**
+     * Add a fileformat plugin
+     *
+     * The plugin needs to either already be loaded or be auto-loadable.
+     * Loading a plugin whose shortname overwrite an existing shortname will overwrite the old plugin.
+     *
+     * @see self::load()
+     * @param string $fullname
+     * @return bool
+     */
+    public static function addFileFormat($fullname)
+    {
+        self::initialize_static_variables();
+
+        if (class_exists($fullname)) {
+            $meta = new \ReflectionClass($fullname);
+            $shortname = $meta->getShortName();
+            self::$plugins[static::ALGORITHM]['Keys'][strtolower($shortname)] = $fullname;
+            if ($meta->hasConstant('IS_INVISIBLE')) {
+                self::$invisiblePlugins[static::ALGORITHM][] = strtolower($shortname);
+            }
+        }
+    }
+
+    /**
+     * Returns the format of the loaded key.
+     *
+     * If the key that was loaded wasn't in a valid or if the key was auto-generated
+     * with RSA::createKey() then this will throw an exception.
+     *
+     * @see self::load()
+     * @return mixed
+     */
+    public function getLoadedFormat()
+    {
+        if (empty($this->format)) {
+            throw new NoKeyLoadedException('This key was created with createKey - it was not loaded with load. Therefore there is no "loaded format"');
+        }
+
+        $meta = new \ReflectionClass($this->format);
+        return $meta->getShortName();
+    }
+
+    /**
+     * Returns the key's comment
+     *
+     * Not all key formats support comments. If you want to set a comment use toString()
+     *
+     * @return null|string
+     */
+    public function getComment()
+    {
+        return $this->comment;
+    }
+
+    /**
+     * Tests engine validity
+     *
+     */
+    public static function useBestEngine()
+    {
+        static::$engines = [
+            'PHP' => true,
+            'OpenSSL' => extension_loaded('openssl'),
+            // this test can be satisfied by either of the following:
+            // http://php.net/manual/en/book.sodium.php
+            // https://github.com/paragonie/sodium_compat
+            'libsodium' => function_exists('sodium_crypto_sign_keypair')
+        ];
+
+        return static::$engines;
+    }
+
+    /**
+     * Flag to use internal engine only (useful for unit testing)
+     *
+     */
+    public static function useInternalEngine()
+    {
+        static::$engines = [
+            'PHP' => true,
+            'OpenSSL' => false,
+            'libsodium' => false
+        ];
+    }
+
+    /**
+     * __toString() magic method
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->toString('PKCS8');
+    }
+
+    /**
+     * Determines which hashing function should be used
+     *
+     * @param string $hash
+     */
+    public function withHash($hash)
+    {
+        $new = clone $this;
+
+        $new->hash = new Hash($hash);
+        $new->hmac = new Hash($hash);
+
+        return $new;
+    }
+
+    /**
+     * Returns the hash algorithm currently being used
+     *
+     */
+    public function getHash()
+    {
+        return clone $this->hash;
+    }
+
+    /**
+     * Compute the pseudorandom k for signature generation,
+     * using the process specified for deterministic DSA.
+     *
+     * @param string $h1
+     * @return string
+     */
+    protected function computek($h1)
+    {
+        $v = str_repeat("\1", strlen($h1));
+
+        $k = str_repeat("\0", strlen($h1));
+
+        $x = $this->int2octets($this->x);
+        $h1 = $this->bits2octets($h1);
+
+        $this->hmac->setKey($k);
+        $k = $this->hmac->hash($v . "\0" . $x . $h1);
+        $this->hmac->setKey($k);
+        $v = $this->hmac->hash($v);
+        $k = $this->hmac->hash($v . "\1" . $x . $h1);
+        $this->hmac->setKey($k);
+        $v = $this->hmac->hash($v);
+
+        $qlen = $this->q->getLengthInBytes();
+
+        while (true) {
+            $t = '';
+            while (strlen($t) < $qlen) {
+                $v = $this->hmac->hash($v);
+                $t = $t . $v;
+            }
+            $k = $this->bits2int($t);
+
+            if (!$k->equals(self::$zero) && $k->compare($this->q) < 0) {
+                break;
+            }
+            $k = $this->hmac->hash($v . "\0");
+            $this->hmac->setKey($k);
+            $v = $this->hmac->hash($v);
+        }
+
+        return $k;
+    }
+
+    /**
+     * Integer to Octet String
+     *
+     * @param BigInteger $v
+     * @return string
+     */
+    private function int2octets($v)
+    {
+        $out = $v->toBytes();
+        $rolen = $this->q->getLengthInBytes();
+        if (strlen($out) < $rolen) {
+            return str_pad($out, $rolen, "\0", STR_PAD_LEFT);
+        } elseif (strlen($out) > $rolen) {
+            return substr($out, -$rolen);
+        } else {
+            return $out;
+        }
+    }
+
+    /**
+     * Bit String to Integer
+     *
+     * @param string $in
+     * @return BigInteger
+     */
+    protected function bits2int($in)
+    {
+        $v = new BigInteger($in, 256);
+        $vlen = strlen($in) << 3;
+        $qlen = $this->q->getLength();
+        if ($vlen > $qlen) {
+            return $v->bitwise_rightShift($vlen - $qlen);
+        }
+        return $v;
+    }
+
+    /**
+     * Bit String to Octet String
+     *
+     * @param string $in
+     * @return string
+     */
+    private function bits2octets($in)
+    {
+        $z1 = $this->bits2int($in);
+        $z2 = $z1->subtract($this->q);
+        return $z2->compare(self::$zero) < 0 ?
+            $this->int2octets($z1) :
+            $this->int2octets($z2);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/BlockCipher.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/BlockCipher.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/BlockCipher.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Base Class for all block ciphers
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+/**
+ * Base Class for all block cipher classes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BlockCipher extends SymmetricKey
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/JWK.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * JSON Web Key (RFC7517) Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+
+/**
+ * JSON Web Key Formatted Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class JWK
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        $key = preg_replace('#\s#', '', $key); // remove whitespace
+
+        if (PHP_VERSION_ID >= 73000) {
+            $key = json_decode($key, null, 512, JSON_THROW_ON_ERROR);
+        } else {
+            $key = json_decode($key);
+            if (!$key) {
+                throw new \RuntimeException('Unable to decode JSON');
+            }
+        }
+
+        if (isset($key->kty)) {
+            return $key;
+        }
+
+        if (count($key->keys) != 1) {
+            throw new \RuntimeException('Although the JWK key format supports multiple keys phpseclib does not');
+        }
+
+        return $key->keys[0];
+    }
+
+    /**
+     * Wrap a key appropriately
+     *
+     * @return string
+     */
+    protected static function wrapKey(array $key, array $options)
+    {
+        return json_encode(['keys' => [$key + $options]]);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,224 @@
+<?php
+
+/**
+ * OpenSSH Key Handler
+ *
+ * PHP version 5
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\AES;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Exception\BadDecryptionException;
+
+/**
+ * OpenSSH Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSH
+{
+    /**
+     * Default comment
+     *
+     * @var string
+     */
+    protected static $comment = 'phpseclib-generated-key';
+
+    /**
+     * Binary key flag
+     *
+     * @var bool
+     */
+    protected static $binary = false;
+
+    /**
+     * Sets the default comment
+     *
+     * @param string $comment
+     */
+    public static function setComment($comment)
+    {
+        self::$comment = str_replace(["\r", "\n"], '', $comment);
+    }
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * $type can be either ssh-dss or ssh-rsa
+     *
+     * @param string $key
+     * @param string $password
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        // key format is described here:
+        // https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.key?annotate=HEAD
+
+        if (strpos($key, 'BEGIN OPENSSH PRIVATE KEY') !== false) {
+            $key = preg_replace('#(?:^-.*?-[\r\n]*$)|\s#ms', '', $key);
+            $key = Strings::base64_decode($key);
+            $magic = Strings::shift($key, 15);
+            if ($magic != "openssh-key-v1\0") {
+                throw new \RuntimeException('Expected openssh-key-v1');
+            }
+            list($ciphername, $kdfname, $kdfoptions, $numKeys) = Strings::unpackSSH2('sssN', $key);
+            if ($numKeys != 1) {
+                // if we wanted to support multiple keys we could update PublicKeyLoader to preview what the # of keys
+                // would be; it'd then call Common\Keys\OpenSSH.php::load() and get the paddedKey. it'd then pass
+                // that to the appropriate key loading parser $numKey times or something
+                throw new \RuntimeException('Although the OpenSSH private key format supports multiple keys phpseclib does not');
+            }
+            switch ($ciphername) {
+                case 'none':
+                    break;
+                case 'aes256-ctr':
+                    if ($kdfname != 'bcrypt') {
+                        throw new \RuntimeException('Only the bcrypt kdf is supported (' . $kdfname . ' encountered)');
+                    }
+                    list($salt, $rounds) = Strings::unpackSSH2('sN', $kdfoptions);
+                    $crypto = new AES('ctr');
+                    //$crypto->setKeyLength(256);
+                    //$crypto->disablePadding();
+                    $crypto->setPassword($password, 'bcrypt', $salt, $rounds, 32);
+                    break;
+                default:
+                    throw new \RuntimeException('The only supported ciphers are: none, aes256-ctr (' . $ciphername . ' is being used)');
+            }
+
+            list($publicKey, $paddedKey) = Strings::unpackSSH2('ss', $key);
+            list($type) = Strings::unpackSSH2('s', $publicKey);
+            if (isset($crypto)) {
+                $paddedKey = $crypto->decrypt($paddedKey);
+            }
+            list($checkint1, $checkint2) = Strings::unpackSSH2('NN', $paddedKey);
+            // any leftover bytes in $paddedKey are for padding? but they should be sequential bytes. eg. 1, 2, 3, etc.
+            if ($checkint1 != $checkint2) {
+                if (isset($crypto)) {
+                    throw new BadDecryptionException('Unable to decrypt key - please verify the password you are using');
+                }
+                throw new \RuntimeException("The two checkints do not match ($checkint1 vs. $checkint2)");
+            }
+            self::checkType($type);
+
+            return compact('type', 'publicKey', 'paddedKey');
+        }
+
+        $parts = explode(' ', $key, 3);
+
+        if (!isset($parts[1])) {
+            $key = base64_decode($parts[0]);
+            $comment = false;
+        } else {
+            $asciiType = $parts[0];
+            self::checkType($parts[0]);
+            $key = base64_decode($parts[1]);
+            $comment = isset($parts[2]) ? $parts[2] : false;
+        }
+        if ($key === false) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        list($type) = Strings::unpackSSH2('s', $key);
+        self::checkType($type);
+        if (isset($asciiType) && $asciiType != $type) {
+            throw new \RuntimeException('Two different types of keys are claimed: ' . $asciiType . ' and ' . $type);
+        }
+        if (strlen($key) <= 4) {
+            throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        $publicKey = $key;
+
+        return compact('type', 'publicKey', 'comment');
+    }
+
+    /**
+     * Toggle between binary and printable keys
+     *
+     * Printable keys are what are generated by default. These are the ones that go in
+     * $HOME/.ssh/authorized_key.
+     *
+     * @param bool $enabled
+     */
+    public static function setBinaryOutput($enabled)
+    {
+        self::$binary = $enabled;
+    }
+
+    /**
+     * Checks to see if the type is valid
+     *
+     * @param string $candidate
+     */
+    private static function checkType($candidate)
+    {
+        if (!in_array($candidate, static::$types)) {
+            throw new \RuntimeException("The key type ($candidate) is not equal to: " . implode(',', static::$types));
+        }
+    }
+
+    /**
+     * Wrap a private key appropriately
+     *
+     * @param string $publicKey
+     * @param string $privateKey
+     * @param string $password
+     * @param array $options
+     * @return string
+     */
+    protected static function wrapPrivateKey($publicKey, $privateKey, $password, $options)
+    {
+        list(, $checkint) = unpack('N', Random::string(4));
+
+        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;
+        $paddedKey = Strings::packSSH2('NN', $checkint, $checkint) .
+                     $privateKey .
+                     Strings::packSSH2('s', $comment);
+
+        $usesEncryption = !empty($password) && is_string($password);
+
+        /*
+           from http://tools.ietf.org/html/rfc4253#section-6 :
+
+           Note that the length of the concatenation of 'packet_length',
+           'padding_length', 'payload', and 'random padding' MUST be a multiple
+           of the cipher block size or 8, whichever is larger.
+         */
+        $blockSize = $usesEncryption ? 16 : 8;
+        $paddingLength = (($blockSize - 1) * strlen($paddedKey)) % $blockSize;
+        for ($i = 1; $i <= $paddingLength; $i++) {
+            $paddedKey .= chr($i);
+        }
+        if (!$usesEncryption) {
+            $key = Strings::packSSH2('sssNss', 'none', 'none', '', 1, $publicKey, $paddedKey);
+        } else {
+            $rounds = isset($options['rounds']) ? $options['rounds'] : 16;
+            $salt = Random::string(16);
+            $kdfoptions = Strings::packSSH2('sN', $salt, $rounds);
+            $crypto = new AES('ctr');
+            $crypto->setPassword($password, 'bcrypt', $salt, $rounds, 32);
+            $paddedKey = $crypto->encrypt($paddedKey);
+            $key = Strings::packSSH2('sssNss', 'aes256-ctr', 'bcrypt', $kdfoptions, 1, $publicKey, $paddedKey);
+        }
+        $key = "openssh-key-v1\0$key";
+
+        return "-----BEGIN OPENSSH PRIVATE KEY-----\n" .
+               chunk_split(Strings::base64_encode($key), 70, "\n") .
+               "-----END OPENSSH PRIVATE KEY-----\n";
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * PKCS Formatted Key Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+/**
+ * PKCS1 Formatted Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS
+{
+    /**
+     * Auto-detect the format
+     */
+    const MODE_ANY = 0;
+    /**
+     * Require base64-encoded PEM's be supplied
+     */
+    const MODE_PEM = 1;
+    /**
+     * Require raw DER's be supplied
+     */
+    const MODE_DER = 2;
+    /**#@-*/
+
+    /**
+     * Is the key a base-64 encoded PEM, DER or should it be auto-detected?
+     *
+     * @var int
+     */
+    protected static $format = self::MODE_ANY;
+
+    /**
+     * Require base64-encoded PEM's be supplied
+     *
+     */
+    public static function requirePEM()
+    {
+        self::$format = self::MODE_PEM;
+    }
+
+    /**
+     * Require raw DER's be supplied
+     *
+     */
+    public static function requireDER()
+    {
+        self::$format = self::MODE_DER;
+    }
+
+    /**
+     * Accept any format and auto detect the format
+     *
+     * This is the default setting
+     *
+     */
+    public static function requireAny()
+    {
+        self::$format = self::MODE_ANY;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,209 @@
+<?php
+
+/**
+ * PKCS1 Formatted Key Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\AES;
+use phpseclib3\Crypt\DES;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\TripleDES;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\File\ASN1;
+
+/**
+ * PKCS1 Formatted Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS1 extends PKCS
+{
+    /**
+     * Default encryption algorithm
+     *
+     * @var string
+     */
+    private static $defaultEncryptionAlgorithm = 'AES-128-CBC';
+
+    /**
+     * Sets the default encryption algorithm
+     *
+     * @param string $algo
+     */
+    public static function setEncryptionAlgorithm($algo)
+    {
+        self::$defaultEncryptionAlgorithm = $algo;
+    }
+
+    /**
+     * Returns the mode constant corresponding to the mode string
+     *
+     * @param string $mode
+     * @return int
+     * @throws \UnexpectedValueException if the block cipher mode is unsupported
+     */
+    private static function getEncryptionMode($mode)
+    {
+        switch ($mode) {
+            case 'CBC':
+            case 'ECB':
+            case 'CFB':
+            case 'OFB':
+            case 'CTR':
+                return $mode;
+        }
+        throw new \UnexpectedValueException('Unsupported block cipher mode of operation');
+    }
+
+    /**
+     * Returns a cipher object corresponding to a string
+     *
+     * @param string $algo
+     * @return string
+     * @throws \UnexpectedValueException if the encryption algorithm is unsupported
+     */
+    private static function getEncryptionObject($algo)
+    {
+        $modes = '(CBC|ECB|CFB|OFB|CTR)';
+        switch (true) {
+            case preg_match("#^AES-(128|192|256)-$modes$#", $algo, $matches):
+                $cipher = new AES(self::getEncryptionMode($matches[2]));
+                $cipher->setKeyLength($matches[1]);
+                return $cipher;
+            case preg_match("#^DES-EDE3-$modes$#", $algo, $matches):
+                return new TripleDES(self::getEncryptionMode($matches[1]));
+            case preg_match("#^DES-$modes$#", $algo, $matches):
+                return new DES(self::getEncryptionMode($matches[1]));
+            default:
+                throw new UnsupportedAlgorithmException($algo . ' is not a supported algorithm');
+        }
+    }
+
+    /**
+     * Generate a symmetric key for PKCS#1 keys
+     *
+     * @param string $password
+     * @param string $iv
+     * @param int $length
+     * @return string
+     */
+    private static function generateSymmetricKey($password, $iv, $length)
+    {
+        $symkey = '';
+        $iv = substr($iv, 0, 8);
+        while (strlen($symkey) < $length) {
+            $symkey .= md5($symkey . $password . $iv, true);
+        }
+        return substr($symkey, 0, $length);
+    }
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    protected static function load($key, $password)
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
+           "outside the scope" of PKCS#1.  PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
+           protect private keys, however, that's not what OpenSSL* does.  OpenSSL protects private keys by adding
+           two new "fields" to the key - DEK-Info and Proc-Type.  These fields are discussed here:
+
+           http://tools.ietf.org/html/rfc1421#section-4.6.1.1
+           http://tools.ietf.org/html/rfc1421#section-4.6.1.3
+
+           DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell.
+           DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation
+           function.  As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's
+           own implementation.  ie. the implementation *is* the standard and any bugs that may exist in that
+           implementation are part of the standard, as well.
+
+           * OpenSSL is the de facto standard.  It's utilized by OpenSSH and other projects */
+        if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) {
+            $iv = Strings::hex2bin(trim($matches[2]));
+            // remove the Proc-Type / DEK-Info sections as they're no longer needed
+            $key = preg_replace('#^(?:Proc-Type|DEK-Info): .*#m', '', $key);
+            $ciphertext = ASN1::extractBER($key);
+            if ($ciphertext === false) {
+                $ciphertext = $key;
+            }
+            $crypto = self::getEncryptionObject($matches[1]);
+            $crypto->setKey(self::generateSymmetricKey($password, $iv, $crypto->getKeyLength() >> 3));
+            $crypto->setIV($iv);
+            $key = $crypto->decrypt($ciphertext);
+        } else {
+            if (self::$format != self::MODE_DER) {
+                $decoded = ASN1::extractBER($key);
+                if ($decoded !== false) {
+                    $key = $decoded;
+                } elseif (self::$format == self::MODE_PEM) {
+                    throw new \UnexpectedValueException('Expected base64-encoded PEM format but was unable to decode base64 text');
+                }
+            }
+        }
+
+        return $key;
+    }
+
+    /**
+     * Wrap a private key appropriately
+     *
+     * @param string $key
+     * @param string $type
+     * @param string $password
+     * @param array $options optional
+     * @return string
+     */
+    protected static function wrapPrivateKey($key, $type, $password, array $options = [])
+    {
+        if (empty($password) || !is_string($password)) {
+            return "-----BEGIN $type PRIVATE KEY-----\r\n" .
+                   chunk_split(Strings::base64_encode($key), 64) .
+                   "-----END $type PRIVATE KEY-----";
+        }
+
+        $encryptionAlgorithm = isset($options['encryptionAlgorithm']) ? $options['encryptionAlgorithm'] : self::$defaultEncryptionAlgorithm;
+
+        $cipher = self::getEncryptionObject($encryptionAlgorithm);
+        $iv = Random::string($cipher->getBlockLength() >> 3);
+        $cipher->setKey(self::generateSymmetricKey($password, $iv, $cipher->getKeyLength() >> 3));
+        $cipher->setIV($iv);
+        $iv = strtoupper(Strings::bin2hex($iv));
+        return "-----BEGIN $type PRIVATE KEY-----\r\n" .
+               "Proc-Type: 4,ENCRYPTED\r\n" .
+               "DEK-Info: " . $encryptionAlgorithm . ",$iv\r\n" .
+               "\r\n" .
+               chunk_split(Strings::base64_encode($cipher->encrypt($key)), 64) .
+               "-----END $type PRIVATE KEY-----";
+    }
+
+    /**
+     * Wrap a public key appropriately
+     *
+     * @param string $key
+     * @param string $type
+     * @return string
+     */
+    protected static function wrapPublicKey($key, $type)
+    {
+        return "-----BEGIN $type PUBLIC KEY-----\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               "-----END $type PUBLIC KEY-----";
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,725 @@
+<?php
+
+/**
+ * PKCS#8 Formatted Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
+ * is specific to private keys it's basically creating a DER-encoded wrapper
+ * for keys. This just extends that same concept to public keys (much like ssh-keygen)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\AES;
+use phpseclib3\Crypt\DES;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\RC2;
+use phpseclib3\Crypt\RC4;
+use phpseclib3\Crypt\TripleDES;
+use phpseclib3\Exception\InsufficientSetupException;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+
+/**
+ * PKCS#8 Formatted Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS8 extends PKCS
+{
+    /**
+     * Default encryption algorithm
+     *
+     * @var string
+     */
+    private static $defaultEncryptionAlgorithm = 'id-PBES2';
+
+    /**
+     * Default encryption scheme
+     *
+     * Only used when defaultEncryptionAlgorithm is id-PBES2
+     *
+     * @var string
+     */
+    private static $defaultEncryptionScheme = 'aes128-CBC-PAD';
+
+    /**
+     * Default PRF
+     *
+     * Only used when defaultEncryptionAlgorithm is id-PBES2
+     *
+     * @var string
+     */
+    private static $defaultPRF = 'id-hmacWithSHA256';
+
+    /**
+     * Default Iteration Count
+     *
+     * @var int
+     */
+    private static $defaultIterationCount = 2048;
+
+    /**
+     * OIDs loaded
+     *
+     * @var bool
+     */
+    private static $oidsLoaded = false;
+
+    /**
+     * Sets the default encryption algorithm
+     *
+     * @param string $algo
+     */
+    public static function setEncryptionAlgorithm($algo)
+    {
+        self::$defaultEncryptionAlgorithm = $algo;
+    }
+
+    /**
+     * Sets the default encryption algorithm for PBES2
+     *
+     * @param string $algo
+     */
+    public static function setEncryptionScheme($algo)
+    {
+        self::$defaultEncryptionScheme = $algo;
+    }
+
+    /**
+     * Sets the iteration count
+     *
+     * @param int $count
+     */
+    public static function setIterationCount($count)
+    {
+        self::$defaultIterationCount = $count;
+    }
+
+    /**
+     * Sets the PRF for PBES2
+     *
+     * @param string $algo
+     */
+    public static function setPRF($algo)
+    {
+        self::$defaultPRF = $algo;
+    }
+
+    /**
+     * Returns a SymmetricKey object based on a PBES1 $algo
+     *
+     * @return \phpseclib3\Crypt\Common\SymmetricKey
+     * @param string $algo
+     */
+    private static function getPBES1EncryptionObject($algo)
+    {
+        $algo = preg_match('#^pbeWith(?:MD2|MD5|SHA1|SHA)And(.*?)-CBC$#', $algo, $matches) ?
+            $matches[1] :
+            substr($algo, 13); // strlen('pbeWithSHAAnd') == 13
+
+        switch ($algo) {
+            case 'DES':
+                $cipher = new DES('cbc');
+                break;
+            case 'RC2':
+                $cipher = new RC2('cbc');
+                $cipher->setKeyLength(64);
+                break;
+            case '3-KeyTripleDES':
+                $cipher = new TripleDES('cbc');
+                break;
+            case '2-KeyTripleDES':
+                $cipher = new TripleDES('cbc');
+                $cipher->setKeyLength(128);
+                break;
+            case '128BitRC2':
+                $cipher = new RC2('cbc');
+                $cipher->setKeyLength(128);
+                break;
+            case '40BitRC2':
+                $cipher = new RC2('cbc');
+                $cipher->setKeyLength(40);
+                break;
+            case '128BitRC4':
+                $cipher = new RC4();
+                $cipher->setKeyLength(128);
+                break;
+            case '40BitRC4':
+                $cipher = new RC4();
+                $cipher->setKeyLength(40);
+                break;
+            default:
+                throw new UnsupportedAlgorithmException("$algo is not a supported algorithm");
+        }
+
+        return $cipher;
+    }
+
+    /**
+     * Returns a hash based on a PBES1 $algo
+     *
+     * @return string
+     * @param string $algo
+     */
+    private static function getPBES1Hash($algo)
+    {
+        if (preg_match('#^pbeWith(MD2|MD5|SHA1|SHA)And.*?-CBC$#', $algo, $matches)) {
+            return $matches[1] == 'SHA' ? 'sha1' : $matches[1];
+        }
+
+        return 'sha1';
+    }
+
+    /**
+     * Returns a KDF baesd on a PBES1 $algo
+     *
+     * @return string
+     * @param string $algo
+     */
+    private static function getPBES1KDF($algo)
+    {
+        switch ($algo) {
+            case 'pbeWithMD2AndDES-CBC':
+            case 'pbeWithMD2AndRC2-CBC':
+            case 'pbeWithMD5AndDES-CBC':
+            case 'pbeWithMD5AndRC2-CBC':
+            case 'pbeWithSHA1AndDES-CBC':
+            case 'pbeWithSHA1AndRC2-CBC':
+                return 'pbkdf1';
+        }
+
+        return 'pkcs12';
+    }
+
+    /**
+     * Returns a SymmetricKey object baesd on a PBES2 $algo
+     *
+     * @return SymmetricKey
+     * @param string $algo
+     */
+    private static function getPBES2EncryptionObject($algo)
+    {
+        switch ($algo) {
+            case 'desCBC':
+                $cipher = new DES('cbc');
+                break;
+            case 'des-EDE3-CBC':
+                $cipher = new TripleDES('cbc');
+                break;
+            case 'rc2CBC':
+                $cipher = new RC2('cbc');
+                // in theory this can be changed
+                $cipher->setKeyLength(128);
+                break;
+            case 'rc5-CBC-PAD':
+                throw new UnsupportedAlgorithmException('rc5-CBC-PAD is not supported for PBES2 PKCS#8 keys');
+            case 'aes128-CBC-PAD':
+            case 'aes192-CBC-PAD':
+            case 'aes256-CBC-PAD':
+                $cipher = new AES('cbc');
+                $cipher->setKeyLength(substr($algo, 3, 3));
+                break;
+            default:
+                throw new UnsupportedAlgorithmException("$algo is not supported");
+        }
+
+        return $cipher;
+    }
+
+    /**
+     * Initialize static variables
+     *
+     */
+    private static function initialize_static_variables()
+    {
+        if (!isset(static::$childOIDsLoaded)) {
+            throw new InsufficientSetupException('This class should not be called directly');
+        }
+
+        if (!static::$childOIDsLoaded) {
+            ASN1::loadOIDs(is_array(static::OID_NAME) ?
+                array_combine(static::OID_NAME, static::OID_VALUE) :
+                [static::OID_NAME => static::OID_VALUE]);
+            static::$childOIDsLoaded = true;
+        }
+        if (!self::$oidsLoaded) {
+            // from https://tools.ietf.org/html/rfc2898
+            ASN1::loadOIDs([
+               // PBES1 encryption schemes
+               'pbeWithMD2AndDES-CBC' => '1.2.840.113549.1.5.1',
+               'pbeWithMD2AndRC2-CBC' => '1.2.840.113549.1.5.4',
+               'pbeWithMD5AndDES-CBC' => '1.2.840.113549.1.5.3',
+               'pbeWithMD5AndRC2-CBC' => '1.2.840.113549.1.5.6',
+               'pbeWithSHA1AndDES-CBC' => '1.2.840.113549.1.5.10',
+               'pbeWithSHA1AndRC2-CBC' => '1.2.840.113549.1.5.11',
+
+               // from PKCS#12:
+               // https://tools.ietf.org/html/rfc7292
+               'pbeWithSHAAnd128BitRC4' => '1.2.840.113549.1.12.1.1',
+               'pbeWithSHAAnd40BitRC4' => '1.2.840.113549.1.12.1.2',
+               'pbeWithSHAAnd3-KeyTripleDES-CBC' => '1.2.840.113549.1.12.1.3',
+               'pbeWithSHAAnd2-KeyTripleDES-CBC' => '1.2.840.113549.1.12.1.4',
+               'pbeWithSHAAnd128BitRC2-CBC' => '1.2.840.113549.1.12.1.5',
+               'pbeWithSHAAnd40BitRC2-CBC' => '1.2.840.113549.1.12.1.6',
+
+               'id-PBKDF2' => '1.2.840.113549.1.5.12',
+               'id-PBES2' => '1.2.840.113549.1.5.13',
+               'id-PBMAC1' => '1.2.840.113549.1.5.14',
+
+               // from PKCS#5 v2.1:
+               // http://www.rsa.com/rsalabs/pkcs/files/h11302-wp-pkcs5v2-1-password-based-cryptography-standard.pdf
+               'id-hmacWithSHA1' => '1.2.840.113549.2.7',
+               'id-hmacWithSHA224' => '1.2.840.113549.2.8',
+               'id-hmacWithSHA256' => '1.2.840.113549.2.9',
+               'id-hmacWithSHA384' => '1.2.840.113549.2.10',
+               'id-hmacWithSHA512' => '1.2.840.113549.2.11',
+               'id-hmacWithSHA512-224' => '1.2.840.113549.2.12',
+               'id-hmacWithSHA512-256' => '1.2.840.113549.2.13',
+
+               'desCBC'       => '1.3.14.3.2.7',
+               'des-EDE3-CBC' => '1.2.840.113549.3.7',
+               'rc2CBC' => '1.2.840.113549.3.2',
+               'rc5-CBC-PAD' => '1.2.840.113549.3.9',
+
+               'aes128-CBC-PAD' => '2.16.840.1.101.3.4.1.2',
+               'aes192-CBC-PAD' => '2.16.840.1.101.3.4.1.22',
+               'aes256-CBC-PAD' => '2.16.840.1.101.3.4.1.42'
+            ]);
+            self::$oidsLoaded = true;
+        }
+    }
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    protected static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        $isPublic = strpos($key, 'PUBLIC') !== false;
+        $isPrivate = strpos($key, 'PRIVATE') !== false;
+
+        $decoded = self::preParse($key);
+
+        $meta = [];
+
+        $decrypted = ASN1::asn1map($decoded[0], Maps\EncryptedPrivateKeyInfo::MAP);
+        if (strlen($password) && is_array($decrypted)) {
+            $algorithm = $decrypted['encryptionAlgorithm']['algorithm'];
+            switch ($algorithm) {
+                // PBES1
+                case 'pbeWithMD2AndDES-CBC':
+                case 'pbeWithMD2AndRC2-CBC':
+                case 'pbeWithMD5AndDES-CBC':
+                case 'pbeWithMD5AndRC2-CBC':
+                case 'pbeWithSHA1AndDES-CBC':
+                case 'pbeWithSHA1AndRC2-CBC':
+                case 'pbeWithSHAAnd3-KeyTripleDES-CBC':
+                case 'pbeWithSHAAnd2-KeyTripleDES-CBC':
+                case 'pbeWithSHAAnd128BitRC2-CBC':
+                case 'pbeWithSHAAnd40BitRC2-CBC':
+                case 'pbeWithSHAAnd128BitRC4':
+                case 'pbeWithSHAAnd40BitRC4':
+                    $cipher = self::getPBES1EncryptionObject($algorithm);
+                    $hash = self::getPBES1Hash($algorithm);
+                    $kdf = self::getPBES1KDF($algorithm);
+
+                    $meta['meta']['algorithm'] = $algorithm;
+
+                    $temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
+                    if (!$temp) {
+                        throw new \RuntimeException('Unable to decode BER');
+                    }
+                    extract(ASN1::asn1map($temp[0], Maps\PBEParameter::MAP));
+                    $iterationCount = (int) $iterationCount->toString();
+                    $cipher->setPassword($password, $kdf, $hash, $salt, $iterationCount);
+                    $key = $cipher->decrypt($decrypted['encryptedData']);
+                    $decoded = ASN1::decodeBER($key);
+                    if (!$decoded) {
+                        throw new \RuntimeException('Unable to decode BER 2');
+                    }
+
+                    break;
+                case 'id-PBES2':
+                    $meta['meta']['algorithm'] = $algorithm;
+
+                    $temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
+                    if (!$temp) {
+                        throw new \RuntimeException('Unable to decode BER');
+                    }
+                    $temp = ASN1::asn1map($temp[0], Maps\PBES2params::MAP);
+                    extract($temp);
+
+                    $cipher = self::getPBES2EncryptionObject($encryptionScheme['algorithm']);
+                    $meta['meta']['cipher'] = $encryptionScheme['algorithm'];
+
+                    $temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
+                    if (!$temp) {
+                        throw new \RuntimeException('Unable to decode BER');
+                    }
+                    $temp = ASN1::asn1map($temp[0], Maps\PBES2params::MAP);
+                    extract($temp);
+
+                    if (!$cipher instanceof RC2) {
+                        $cipher->setIV($encryptionScheme['parameters']['octetString']);
+                    } else {
+                        $temp = ASN1::decodeBER($encryptionScheme['parameters']);
+                        if (!$temp) {
+                            throw new \RuntimeException('Unable to decode BER');
+                        }
+                        extract(ASN1::asn1map($temp[0], Maps\RC2CBCParameter::MAP));
+                        $effectiveKeyLength = (int) $rc2ParametersVersion->toString();
+                        switch ($effectiveKeyLength) {
+                            case 160:
+                                $effectiveKeyLength = 40;
+                                break;
+                            case 120:
+                                $effectiveKeyLength = 64;
+                                break;
+                            case 58:
+                                $effectiveKeyLength = 128;
+                                break;
+                            //default: // should be >= 256
+                        }
+                        $cipher->setIV($iv);
+                        $cipher->setKeyLength($effectiveKeyLength);
+                    }
+
+                    $meta['meta']['keyDerivationFunc'] = $keyDerivationFunc['algorithm'];
+                    switch ($keyDerivationFunc['algorithm']) {
+                        case 'id-PBKDF2':
+                            $temp = ASN1::decodeBER($keyDerivationFunc['parameters']);
+                            if (!$temp) {
+                                throw new \RuntimeException('Unable to decode BER');
+                            }
+                            $prf = ['algorithm' => 'id-hmacWithSHA1'];
+                            $params = ASN1::asn1map($temp[0], Maps\PBKDF2params::MAP);
+                            extract($params);
+                            $meta['meta']['prf'] = $prf['algorithm'];
+                            $hash = str_replace('-', '/', substr($prf['algorithm'], 11));
+                            $params = [
+                                $password,
+                                'pbkdf2',
+                                $hash,
+                                $salt,
+                                (int) $iterationCount->toString()
+                            ];
+                            if (isset($keyLength)) {
+                                $params[] = (int) $keyLength->toString();
+                            }
+                            $cipher->setPassword(...$params);
+                            $key = $cipher->decrypt($decrypted['encryptedData']);
+                            $decoded = ASN1::decodeBER($key);
+                            if (!$decoded) {
+                                throw new \RuntimeException('Unable to decode BER 3');
+                            }
+                            break;
+                        default:
+                            throw new UnsupportedAlgorithmException('Only PBKDF2 is supported for PBES2 PKCS#8 keys');
+                    }
+                    break;
+                case 'id-PBMAC1':
+                    //$temp = ASN1::decodeBER($decrypted['encryptionAlgorithm']['parameters']);
+                    //$value = ASN1::asn1map($temp[0], Maps\PBMAC1params::MAP);
+                    // since i can't find any implementation that does PBMAC1 it is unsupported
+                    throw new UnsupportedAlgorithmException('Only PBES1 and PBES2 PKCS#8 keys are supported.');
+                // at this point we'll assume that the key conforms to PublicKeyInfo
+            }
+        }
+
+        $private = ASN1::asn1map($decoded[0], Maps\OneAsymmetricKey::MAP);
+        if (is_array($private)) {
+            if ($isPublic) {
+                throw new \UnexpectedValueException('Human readable string claims public key but DER encoded string claims private key');
+            }
+
+            if (isset($private['privateKeyAlgorithm']['parameters']) && !$private['privateKeyAlgorithm']['parameters'] instanceof ASN1\Element && isset($decoded[0]['content'][1]['content'][1])) {
+                $temp = $decoded[0]['content'][1]['content'][1];
+                $private['privateKeyAlgorithm']['parameters'] = new ASN1\Element(substr($key, $temp['start'], $temp['length']));
+            }
+            if (is_array(static::OID_NAME)) {
+                if (!in_array($private['privateKeyAlgorithm']['algorithm'], static::OID_NAME)) {
+                    throw new UnsupportedAlgorithmException($private['privateKeyAlgorithm']['algorithm'] . ' is not a supported key type');
+                }
+            } else {
+                if ($private['privateKeyAlgorithm']['algorithm'] != static::OID_NAME) {
+                    throw new UnsupportedAlgorithmException('Only ' . static::OID_NAME . ' keys are supported; this is a ' . $private['privateKeyAlgorithm']['algorithm'] . ' key');
+                }
+            }
+            if (isset($private['publicKey'])) {
+                if ($private['publicKey'][0] != "\0") {
+                    throw new \UnexpectedValueException('The first byte of the public key should be null - not ' . bin2hex($private['publicKey'][0]));
+                }
+                $private['publicKey'] = substr($private['publicKey'], 1);
+            }
+            return $private + $meta;
+        }
+
+        // EncryptedPrivateKeyInfo and PublicKeyInfo have largely identical "signatures". the only difference
+        // is that the former has an octet string and the later has a bit string. the first byte of a bit
+        // string represents the number of bits in the last byte that are to be ignored but, currently,
+        // bit strings wanting a non-zero amount of bits trimmed are not supported
+        $public = ASN1::asn1map($decoded[0], Maps\PublicKeyInfo::MAP);
+
+        if (is_array($public)) {
+            if ($isPrivate) {
+                throw new \UnexpectedValueException('Human readable string claims private key but DER encoded string claims public key');
+            }
+
+            if ($public['publicKey'][0] != "\0") {
+                throw new \UnexpectedValueException('The first byte of the public key should be null - not ' . bin2hex($public['publicKey'][0]));
+            }
+            if (is_array(static::OID_NAME)) {
+                if (!in_array($public['publicKeyAlgorithm']['algorithm'], static::OID_NAME)) {
+                    throw new UnsupportedAlgorithmException($public['publicKeyAlgorithm']['algorithm'] . ' is not a supported key type');
+                }
+            } else {
+                if ($public['publicKeyAlgorithm']['algorithm'] != static::OID_NAME) {
+                    throw new UnsupportedAlgorithmException('Only ' . static::OID_NAME . ' keys are supported; this is a ' . $public['publicKeyAlgorithm']['algorithm'] . ' key');
+                }
+            }
+            if (isset($public['publicKeyAlgorithm']['parameters']) && !$public['publicKeyAlgorithm']['parameters'] instanceof ASN1\Element && isset($decoded[0]['content'][0]['content'][1])) {
+                $temp = $decoded[0]['content'][0]['content'][1];
+                $public['publicKeyAlgorithm']['parameters'] = new ASN1\Element(substr($key, $temp['start'], $temp['length']));
+            }
+            $public['publicKey'] = substr($public['publicKey'], 1);
+            return $public;
+        }
+
+        throw new \RuntimeException('Unable to parse using either OneAsymmetricKey or PublicKeyInfo ASN1 maps');
+    }
+
+    /**
+     * Wrap a private key appropriately
+     *
+     * @param string $key
+     * @param string $attr
+     * @param mixed $params
+     * @param string $password
+     * @param string $oid optional
+     * @param string $publicKey optional
+     * @param array $options optional
+     * @return string
+     */
+    protected static function wrapPrivateKey($key, $attr, $params, $password, $oid = null, $publicKey = '', array $options = [])
+    {
+        self::initialize_static_variables();
+
+        $key = [
+            'version' => 'v1',
+            'privateKeyAlgorithm' => [
+                'algorithm' => is_string(static::OID_NAME) ? static::OID_NAME : $oid
+             ],
+            'privateKey' => $key
+        ];
+        if ($oid != 'id-Ed25519' && $oid != 'id-Ed448') {
+            $key['privateKeyAlgorithm']['parameters'] = $params;
+        }
+        if (!empty($attr)) {
+            $key['attributes'] = $attr;
+        }
+        if (!empty($publicKey)) {
+            $key['version'] = 'v2';
+            $key['publicKey'] = $publicKey;
+        }
+        $key = ASN1::encodeDER($key, Maps\OneAsymmetricKey::MAP);
+        if (!empty($password) && is_string($password)) {
+            $salt = Random::string(8);
+
+            $iterationCount = isset($options['iterationCount']) ? $options['iterationCount'] : self::$defaultIterationCount;
+            $encryptionAlgorithm = isset($options['encryptionAlgorithm']) ? $options['encryptionAlgorithm'] : self::$defaultEncryptionAlgorithm;
+            $encryptionScheme = isset($options['encryptionScheme']) ? $options['encryptionScheme'] : self::$defaultEncryptionScheme;
+            $prf = isset($options['PRF']) ? $options['PRF'] : self::$defaultPRF;
+
+            if ($encryptionAlgorithm == 'id-PBES2') {
+                $crypto = self::getPBES2EncryptionObject($encryptionScheme);
+                $hash = str_replace('-', '/', substr($prf, 11));
+                $kdf = 'pbkdf2';
+                $iv = Random::string($crypto->getBlockLength() >> 3);
+
+                $PBKDF2params = [
+                    'salt' => $salt,
+                    'iterationCount' => $iterationCount,
+                    'prf' => ['algorithm' => $prf, 'parameters' => null]
+                ];
+                $PBKDF2params = ASN1::encodeDER($PBKDF2params, Maps\PBKDF2params::MAP);
+
+                if (!$crypto instanceof RC2) {
+                    $params = ['octetString' => $iv];
+                } else {
+                    $params = [
+                        'rc2ParametersVersion' => 58,
+                        'iv' => $iv
+                    ];
+                    $params = ASN1::encodeDER($params, Maps\RC2CBCParameter::MAP);
+                    $params = new ASN1\Element($params);
+                }
+
+                $params = [
+                    'keyDerivationFunc' => [
+                        'algorithm' => 'id-PBKDF2',
+                        'parameters' => new ASN1\Element($PBKDF2params)
+                    ],
+                    'encryptionScheme' => [
+                        'algorithm' => $encryptionScheme,
+                        'parameters' => $params
+                    ]
+                ];
+                $params = ASN1::encodeDER($params, Maps\PBES2params::MAP);
+
+                $crypto->setIV($iv);
+            } else {
+                $crypto = self::getPBES1EncryptionObject($encryptionAlgorithm);
+                $hash = self::getPBES1Hash($encryptionAlgorithm);
+                $kdf = self::getPBES1KDF($encryptionAlgorithm);
+
+                $params = [
+                    'salt' => $salt,
+                    'iterationCount' => $iterationCount
+                ];
+                $params = ASN1::encodeDER($params, Maps\PBEParameter::MAP);
+            }
+            $crypto->setPassword($password, $kdf, $hash, $salt, $iterationCount);
+            $key = $crypto->encrypt($key);
+
+            $key = [
+                'encryptionAlgorithm' => [
+                    'algorithm' => $encryptionAlgorithm,
+                    'parameters' => new ASN1\Element($params)
+                ],
+                'encryptedData' => $key
+            ];
+
+            $key = ASN1::encodeDER($key, Maps\EncryptedPrivateKeyInfo::MAP);
+
+            return "-----BEGIN ENCRYPTED PRIVATE KEY-----\r\n" .
+                   chunk_split(Strings::base64_encode($key), 64) .
+                   "-----END ENCRYPTED PRIVATE KEY-----";
+        }
+
+        return "-----BEGIN PRIVATE KEY-----\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               "-----END PRIVATE KEY-----";
+    }
+
+    /**
+     * Wrap a public key appropriately
+     *
+     * @param string $key
+     * @param mixed $params
+     * @param string $oid
+     * @return string
+     */
+    protected static function wrapPublicKey($key, $params, $oid = null)
+    {
+        self::initialize_static_variables();
+
+        $key = [
+            'publicKeyAlgorithm' => [
+                'algorithm' => is_string(static::OID_NAME) ? static::OID_NAME : $oid
+            ],
+            'publicKey' => "\0" . $key
+        ];
+
+        if ($oid != 'id-Ed25519' && $oid != 'id-Ed448') {
+            $key['publicKeyAlgorithm']['parameters'] = $params;
+        }
+
+        $key = ASN1::encodeDER($key, Maps\PublicKeyInfo::MAP);
+
+        return "-----BEGIN PUBLIC KEY-----\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               "-----END PUBLIC KEY-----";
+    }
+
+    /**
+     * Perform some preliminary parsing of the key
+     *
+     * @param string $key
+     * @return array
+     */
+    private static function preParse(&$key)
+    {
+        self::initialize_static_variables();
+
+        if (self::$format != self::MODE_DER) {
+            $decoded = ASN1::extractBER($key);
+            if ($decoded !== false) {
+                $key = $decoded;
+            } elseif (self::$format == self::MODE_PEM) {
+                throw new \UnexpectedValueException('Expected base64-encoded PEM format but was unable to decode base64 text');
+            }
+        }
+
+        $decoded = ASN1::decodeBER($key);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        return $decoded;
+    }
+
+    /**
+     * Returns the encryption parameters used by the key
+     *
+     * @param string $key
+     * @return array
+     */
+    public static function extractEncryptionAlgorithm($key)
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        $decoded = self::preParse($key);
+
+        $r = ASN1::asn1map($decoded[0], Maps\EncryptedPrivateKeyInfo::MAP);
+        if (!is_array($r)) {
+            throw new \RuntimeException('Unable to parse using EncryptedPrivateKeyInfo map');
+        }
+
+        if ($r['encryptionAlgorithm']['algorithm'] == 'id-PBES2') {
+            $decoded = ASN1::decodeBER($r['encryptionAlgorithm']['parameters']->element);
+            if (!$decoded) {
+                throw new \RuntimeException('Unable to decode BER');
+            }
+            $r['encryptionAlgorithm']['parameters'] = ASN1::asn1map($decoded[0], Maps\PBES2params::MAP);
+
+            $kdf = &$r['encryptionAlgorithm']['parameters']['keyDerivationFunc'];
+            switch ($kdf['algorithm']) {
+                case 'id-PBKDF2':
+                    $decoded = ASN1::decodeBER($kdf['parameters']->element);
+                    if (!$decoded) {
+                        throw new \RuntimeException('Unable to decode BER');
+                    }
+                    $kdf['parameters'] = ASN1::asn1map($decoded[0], Maps\PBKDF2params::MAP);
+            }
+        }
+
+        return $r['encryptionAlgorithm'];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,374 @@
+<?php
+
+/**
+ * PuTTY Formatted Key Handler
+ *
+ * See PuTTY's SSHPUBK.C and https://tartarus.org/~simon/putty-snapshots/htmldoc/AppendixC.html
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\AES;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+
+/**
+ * PuTTY Formatted Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PuTTY
+{
+    /**
+     * Default comment
+     *
+     * @var string
+     */
+    private static $comment = 'phpseclib-generated-key';
+
+    /**
+     * Default version
+     *
+     * @var int
+     */
+    private static $version = 2;
+
+    /**
+     * Sets the default comment
+     *
+     * @param string $comment
+     */
+    public static function setComment($comment)
+    {
+        self::$comment = str_replace(["\r", "\n"], '', $comment);
+    }
+
+    /**
+     * Sets the default version
+     *
+     * @param int $version
+     */
+    public static function setVersion($version)
+    {
+        if ($version != 2 && $version != 3) {
+            throw new \RuntimeException('Only supported versions are 2 and 3');
+        }
+        self::$version = $version;
+    }
+
+    /**
+     * Generate a symmetric key for PuTTY v2 keys
+     *
+     * @param string $password
+     * @param int $length
+     * @return string
+     */
+    private static function generateV2Key($password, $length)
+    {
+        $symkey = '';
+        $sequence = 0;
+        while (strlen($symkey) < $length) {
+            $temp = pack('Na*', $sequence++, $password);
+            $symkey .= Strings::hex2bin(sha1($temp));
+        }
+        return substr($symkey, 0, $length);
+    }
+
+    /**
+     * Generate a symmetric key for PuTTY v3 keys
+     *
+     * @param string $password
+     * @param string $flavour
+     * @param int $memory
+     * @param int $passes
+     * @param string $salt
+     * @return array
+     */
+    private static function generateV3Key($password, $flavour, $memory, $passes, $salt)
+    {
+        if (!function_exists('sodium_crypto_pwhash')) {
+            throw new \RuntimeException('sodium_crypto_pwhash needs to exist for Argon2 password hasing');
+        }
+
+        switch ($flavour) {
+            case 'Argon2i':
+                $flavour = SODIUM_CRYPTO_PWHASH_ALG_ARGON2I13;
+                break;
+            case 'Argon2id':
+                $flavour = SODIUM_CRYPTO_PWHASH_ALG_ARGON2ID13;
+                break;
+            default:
+                throw new UnsupportedAlgorithmException('Only Argon2i and Argon2id are supported');
+        }
+
+        $length = 80; // keylen + ivlen + mac_keylen
+        $temp = sodium_crypto_pwhash($length, $password, $salt, $passes, $memory << 10, $flavour);
+
+        $symkey = substr($temp, 0, 32);
+        $symiv = substr($temp, 32, 16);
+        $hashkey = substr($temp, -32);
+
+        return compact('symkey', 'symiv', 'hashkey');
+    }
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password
+     * @return array
+     */
+    public static function load($key, $password)
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (strpos($key, 'BEGIN SSH2 PUBLIC KEY') !== false) {
+            $lines = preg_split('#[\r\n]+#', $key);
+            switch (true) {
+                case $lines[0] != '---- BEGIN SSH2 PUBLIC KEY ----':
+                    throw new \UnexpectedValueException('Key doesn\'t start with ---- BEGIN SSH2 PUBLIC KEY ----');
+                case $lines[count($lines) - 1] != '---- END SSH2 PUBLIC KEY ----':
+                    throw new \UnexpectedValueException('Key doesn\'t end with ---- END SSH2 PUBLIC KEY ----');
+            }
+            $lines = array_splice($lines, 1, -1);
+            $lines = array_map(function ($line) {
+                return rtrim($line, "\r\n");
+            }, $lines);
+            $data = $current = '';
+            $values = [];
+            $in_value = false;
+            foreach ($lines as $line) {
+                switch (true) {
+                    case preg_match('#^(.*?): (.*)#', $line, $match):
+                        $in_value = $line[strlen($line) - 1] == '\\';
+                        $current = strtolower($match[1]);
+                        $values[$current] = $in_value ? substr($match[2], 0, -1) : $match[2];
+                        break;
+                    case $in_value:
+                        $in_value = $line[strlen($line) - 1] == '\\';
+                        $values[$current] .= $in_value ? substr($line, 0, -1) : $line;
+                        break;
+                    default:
+                        $data .= $line;
+                }
+            }
+
+            $components = call_user_func([static::PUBLIC_HANDLER, 'load'], $data);
+            if ($components === false) {
+                throw new \UnexpectedValueException('Unable to decode public key');
+            }
+            $components += $values;
+            $components['comment'] = str_replace(['\\\\', '\"'], ['\\', '"'], $values['comment']);
+
+            return $components;
+        }
+
+        $components = [];
+
+        $key = preg_split('#\r\n|\r|\n#', trim($key));
+        if (Strings::shift($key[0], strlen('PuTTY-User-Key-File-')) != 'PuTTY-User-Key-File-') {
+            return false;
+        }
+        $version = (int) Strings::shift($key[0], 3); // should be either "2: " or "3: 0" prior to int casting
+        if ($version != 2 && $version != 3) {
+            throw new \RuntimeException('Only v2 and v3 PuTTY private keys are supported');
+        }
+        $components['type'] = $type = rtrim($key[0]);
+        if (!in_array($type, static::$types)) {
+            $error = count(static::$types) == 1 ?
+                'Only ' . static::$types[0] . ' keys are supported. ' :
+                '';
+            throw new UnsupportedAlgorithmException($error . 'This is an unsupported ' . $type . ' key');
+        }
+        $encryption = trim(preg_replace('#Encryption: (.+)#', '$1', $key[1]));
+        $components['comment'] = trim(preg_replace('#Comment: (.+)#', '$1', $key[2]));
+
+        $publicLength = trim(preg_replace('#Public-Lines: (\d+)#', '$1', $key[3]));
+        $public = Strings::base64_decode(implode('', array_map('trim', array_slice($key, 4, $publicLength))));
+
+        $source = Strings::packSSH2('ssss', $type, $encryption, $components['comment'], $public);
+
+        extract(unpack('Nlength', Strings::shift($public, 4)));
+        $newtype = Strings::shift($public, $length);
+        if ($newtype != $type) {
+            throw new \RuntimeException('The binary type does not match the human readable type field');
+        }
+
+        $components['public'] = $public;
+
+        switch ($version) {
+            case 3:
+                $hashkey = '';
+                break;
+            case 2:
+                $hashkey = 'putty-private-key-file-mac-key';
+        }
+
+        $offset = $publicLength + 4;
+        switch ($encryption) {
+            case 'aes256-cbc':
+                $crypto = new AES('cbc');
+                switch ($version) {
+                    case 3:
+                        $flavour = trim(preg_replace('#Key-Derivation: (.*)#', '$1', $key[$offset++]));
+                        $memory = trim(preg_replace('#Argon2-Memory: (\d+)#', '$1', $key[$offset++]));
+                        $passes = trim(preg_replace('#Argon2-Passes: (\d+)#', '$1', $key[$offset++]));
+                        $parallelism = trim(preg_replace('#Argon2-Parallelism: (\d+)#', '$1', $key[$offset++]));
+                        $salt = Strings::hex2bin(trim(preg_replace('#Argon2-Salt: ([0-9a-f]+)#', '$1', $key[$offset++])));
+
+                        extract(self::generateV3Key($password, $flavour, $memory, $passes, $salt));
+
+                        break;
+                    case 2:
+                        $symkey = self::generateV2Key($password, 32);
+                        $symiv = str_repeat("\0", $crypto->getBlockLength() >> 3);
+                        $hashkey .= $password;
+                }
+        }
+
+        switch ($version) {
+            case 3:
+                $hash = new Hash('sha256');
+                $hash->setKey($hashkey);
+                break;
+            case 2:
+                $hash = new Hash('sha1');
+                $hash->setKey(sha1($hashkey, true));
+        }
+
+        $privateLength = trim(preg_replace('#Private-Lines: (\d+)#', '$1', $key[$offset++]));
+        $private = Strings::base64_decode(implode('', array_map('trim', array_slice($key, $offset, $privateLength))));
+
+        if ($encryption != 'none') {
+            $crypto->setKey($symkey);
+            $crypto->setIV($symiv);
+            $crypto->disablePadding();
+            $private = $crypto->decrypt($private);
+        }
+
+        $source .= Strings::packSSH2('s', $private);
+
+        $hmac = trim(preg_replace('#Private-MAC: (.+)#', '$1', $key[$offset + $privateLength]));
+        $hmac = Strings::hex2bin($hmac);
+
+        if (!hash_equals($hash->hash($source), $hmac)) {
+            throw new \UnexpectedValueException('MAC validation error');
+        }
+
+        $components['private'] = $private;
+
+        return $components;
+    }
+
+    /**
+     * Wrap a private key appropriately
+     *
+     * @param string $public
+     * @param string $private
+     * @param string $type
+     * @param string $password
+     * @param array $options optional
+     * @return string
+     */
+    protected static function wrapPrivateKey($public, $private, $type, $password, array $options = [])
+    {
+        $encryption = (!empty($password) || is_string($password)) ? 'aes256-cbc' : 'none';
+        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;
+        $version = isset($options['version']) ? $options['version'] : self::$version;
+
+        $key = "PuTTY-User-Key-File-$version: $type\r\n";
+        $key .= "Encryption: $encryption\r\n";
+        $key .= "Comment: $comment\r\n";
+
+        $public = Strings::packSSH2('s', $type) . $public;
+
+        $source = Strings::packSSH2('ssss', $type, $encryption, $comment, $public);
+
+        $public = Strings::base64_encode($public);
+        $key .= "Public-Lines: " . ((strlen($public) + 63) >> 6) . "\r\n";
+        $key .= chunk_split($public, 64);
+
+        if (empty($password) && !is_string($password)) {
+            $source .= Strings::packSSH2('s', $private);
+            switch ($version) {
+                case 3:
+                    $hash = new Hash('sha256');
+                    $hash->setKey('');
+                    break;
+                case 2:
+                    $hash = new Hash('sha1');
+                    $hash->setKey(sha1('putty-private-key-file-mac-key', true));
+            }
+        } else {
+            $private .= Random::string(16 - (strlen($private) & 15));
+            $source .= Strings::packSSH2('s', $private);
+            $crypto = new AES('cbc');
+
+            switch ($version) {
+                case 3:
+                    $salt = Random::string(16);
+                    $key .= "Key-Derivation: Argon2id\r\n";
+                    $key .= "Argon2-Memory: 8192\r\n";
+                    $key .= "Argon2-Passes: 13\r\n";
+                    $key .= "Argon2-Parallelism: 1\r\n";
+                    $key .= "Argon2-Salt: " . Strings::bin2hex($salt) . "\r\n";
+                    extract(self::generateV3Key($password, 'Argon2id', 8192, 13, $salt));
+
+                    $hash = new Hash('sha256');
+                    $hash->setKey($hashkey);
+
+                    break;
+                case 2:
+                    $symkey = self::generateV2Key($password, 32);
+                    $symiv = str_repeat("\0", $crypto->getBlockLength() >> 3);
+                    $hashkey = 'putty-private-key-file-mac-key' . $password;
+
+                    $hash = new Hash('sha1');
+                    $hash->setKey(sha1($hashkey, true));
+            }
+
+            $crypto->setKey($symkey);
+            $crypto->setIV($symiv);
+            $crypto->disablePadding();
+            $private = $crypto->encrypt($private);
+            $mac = $hash->hash($source);
+        }
+
+        $private = Strings::base64_encode($private);
+        $key .= 'Private-Lines: ' . ((strlen($private) + 63) >> 6) . "\r\n";
+        $key .= chunk_split($private, 64);
+        $key .= 'Private-MAC: ' . Strings::bin2hex($hash->hash($source)) . "\r\n";
+
+        return $key;
+    }
+
+    /**
+     * Wrap a public key appropriately
+     *
+     * This is basically the format described in RFC 4716 (https://tools.ietf.org/html/rfc4716)
+     *
+     * @param string $key
+     * @param string $type
+     * @return string
+     */
+    protected static function wrapPublicKey($key, $type)
+    {
+        $key = pack('Na*a*', strlen($type), $type, $key);
+        $key = "---- BEGIN SSH2 PUBLIC KEY ----\r\n" .
+               'Comment: "' . str_replace(['\\', '"'], ['\\\\', '\"'], self::$comment) . "\"\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               '---- END SSH2 PUBLIC KEY ----';
+        return $key;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Signature/Raw.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * Raw Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures as arrays
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Formats\Signature;
+
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Raw Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Raw
+{
+    /**
+     * Loads a signature
+     *
+     * @param array $sig
+     * @return array|bool
+     */
+    public static function load($sig)
+    {
+        switch (true) {
+            case !is_array($sig):
+            case !isset($sig['r']) || !isset($sig['s']):
+            case !$sig['r'] instanceof BigInteger:
+            case !$sig['s'] instanceof BigInteger:
+                return false;
+        }
+
+        return [
+            'r' => $sig['r'],
+            's' => $sig['s']
+        ];
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s)
+    {
+        return compact('r', 's');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * PrivateKey interface
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+/**
+ * PrivateKey interface
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+interface PrivateKey
+{
+    public function sign($message);
+    //public function decrypt($ciphertext);
+    public function getPublicKey();
+    public function toString($type, array $options = []);
+
+    /**
+     * @param string|false $password
+     * @return mixed
+     */
+    public function withPassword($password = false);
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * PublicKey interface
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+/**
+ * PublicKey interface
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+interface PublicKey
+{
+    public function verify($message, $signature);
+    //public function encrypt($plaintext);
+    public function toString($type, array $options = []);
+    public function getFingerprint($algorithm);
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/StreamCipher.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/StreamCipher.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/StreamCipher.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Base Class for all stream ciphers
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+/**
+ * Base Class for all stream cipher classes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class StreamCipher extends SymmetricKey
+{
+    /**
+     * Block Length of the cipher
+     *
+     * Stream ciphers do not have a block size
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
+     * @var int
+     */
+    protected $block_size = 0;
+
+    /**
+     * Default Constructor.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @return StreamCipher
+     */
+    public function __construct()
+    {
+        parent::__construct('stream');
+    }
+
+    /**
+     * Stream ciphers not use an IV
+     *
+     * @return bool
+     */
+    public function usesIV()
+    {
+        return false;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/SymmetricKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/SymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/SymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,3398 @@
+<?php
+
+/**
+ * Base Class for all \phpseclib3\Crypt\* cipher classes
+ *
+ * PHP version 5
+ *
+ * Internally for phpseclib developers:
+ *  If you plan to add a new cipher class, please note following rules:
+ *
+ *  - The new \phpseclib3\Crypt\* cipher class should extend \phpseclib3\Crypt\Common\SymmetricKey
+ *
+ *  - Following methods are then required to be overridden/overloaded:
+ *
+ *    - encryptBlock()
+ *
+ *    - decryptBlock()
+ *
+ *    - setupKey()
+ *
+ *  - All other methods are optional to be overridden/overloaded
+ *
+ *  - Look at the source code of the current ciphers how they extend \phpseclib3\Crypt\Common\SymmetricKey
+ *    and take one of them as a start up for the new cipher class.
+ *
+ *  - Please read all the other comments/notes/hints here also for each class var/method
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Blowfish;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Exception\BadDecryptionException;
+use phpseclib3\Exception\BadModeException;
+use phpseclib3\Exception\InconsistentSetupException;
+use phpseclib3\Exception\InsufficientSetupException;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\BinaryField;
+use phpseclib3\Math\PrimeField;
+
+/**
+ * Base Class for all \phpseclib3\Crypt\* cipher classes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ */
+abstract class SymmetricKey
+{
+    /**
+     * Encrypt / decrypt using the Counter mode.
+     *
+     * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_CTR = -1;
+    /**
+     * Encrypt / decrypt using the Electronic Code Book mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_ECB = 1;
+    /**
+     * Encrypt / decrypt using the Code Book Chaining mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_CBC = 2;
+    /**
+     * Encrypt / decrypt using the Cipher Feedback mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_CFB = 3;
+    /**
+     * Encrypt / decrypt using the Cipher Feedback mode (8bit)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_CFB8 = 7;
+    /**
+     * Encrypt / decrypt using the Output Feedback mode (8bit)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_OFB8 = 8;
+    /**
+     * Encrypt / decrypt using the Output Feedback mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_OFB = 4;
+    /**
+     * Encrypt / decrypt using Galois/Counter mode.
+     *
+     * @link https://en.wikipedia.org/wiki/Galois/Counter_Mode
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_GCM = 5;
+    /**
+     * Encrypt / decrypt using streaming mode.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     */
+    const MODE_STREAM = 6;
+
+    /**
+     * Mode Map
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const MODE_MAP = [
+        'ctr'    => self::MODE_CTR,
+        'ecb'    => self::MODE_ECB,
+        'cbc'    => self::MODE_CBC,
+        'cfb'    => self::MODE_CFB,
+        'cfb8'   => self::MODE_CFB8,
+        'ofb'    => self::MODE_OFB,
+        'ofb8'   => self::MODE_OFB8,
+        'gcm'    => self::MODE_GCM,
+        'stream' => self::MODE_STREAM
+    ];
+
+    /**
+     * Base value for the internal implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_INTERNAL = 1;
+    /**
+     * Base value for the eval() implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_EVAL = 2;
+    /**
+     * Base value for the mcrypt implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_MCRYPT = 3;
+    /**
+     * Base value for the openssl implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_OPENSSL = 4;
+    /**
+     * Base value for the libsodium implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_LIBSODIUM = 5;
+    /**
+     * Base value for the openssl / gcm implementation $engine switch
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     */
+    const ENGINE_OPENSSL_GCM = 6;
+
+    /**
+     * Engine Reverse Map
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::getEngine()
+     */
+    const ENGINE_MAP = [
+        self::ENGINE_INTERNAL    => 'PHP',
+        self::ENGINE_EVAL        => 'Eval',
+        self::ENGINE_MCRYPT      => 'mcrypt',
+        self::ENGINE_OPENSSL     => 'OpenSSL',
+        self::ENGINE_LIBSODIUM   => 'libsodium',
+        self::ENGINE_OPENSSL_GCM => 'OpenSSL (GCM)'
+    ];
+
+    /**
+     * The Encryption Mode
+     *
+     * @see self::__construct()
+     * @var int
+     */
+    protected $mode;
+
+    /**
+     * The Block Length of the block cipher
+     *
+     * @var int
+     */
+    protected $block_size = 16;
+
+    /**
+     * The Key
+     *
+     * @see self::setKey()
+     * @var string
+     */
+    protected $key = false;
+
+    /**
+     * HMAC Key
+     *
+     * @see self::setupGCM()
+     * @var ?string
+     */
+    protected $hKey = false;
+
+    /**
+     * The Initialization Vector
+     *
+     * @see self::setIV()
+     * @var string
+     */
+    protected $iv = false;
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see self::enableContinuousBuffer()
+     * @see self::clearBuffers()
+     * @var string
+     */
+    protected $encryptIV;
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see self::enableContinuousBuffer()
+     * @see self::clearBuffers()
+     * @var string
+     */
+    protected $decryptIV;
+
+    /**
+     * Continuous Buffer status
+     *
+     * @see self::enableContinuousBuffer()
+     * @var bool
+     */
+    protected $continuousBuffer = false;
+
+    /**
+     * Encryption buffer for CTR, OFB and CFB modes
+     *
+     * @see self::encrypt()
+     * @see self::clearBuffers()
+     * @var array
+     */
+    protected $enbuffer;
+
+    /**
+     * Decryption buffer for CTR, OFB and CFB modes
+     *
+     * @see self::decrypt()
+     * @see self::clearBuffers()
+     * @var array
+     */
+    protected $debuffer;
+
+    /**
+     * mcrypt resource for encryption
+     *
+     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
+     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
+     *
+     * @see self::encrypt()
+     * @var resource
+     */
+    private $enmcrypt;
+
+    /**
+     * mcrypt resource for decryption
+     *
+     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
+     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
+     *
+     * @see self::decrypt()
+     * @var resource
+     */
+    private $demcrypt;
+
+    /**
+     * Does the enmcrypt resource need to be (re)initialized?
+     *
+     * @see \phpseclib3\Crypt\Twofish::setKey()
+     * @see \phpseclib3\Crypt\Twofish::setIV()
+     * @var bool
+     */
+    private $enchanged = true;
+
+    /**
+     * Does the demcrypt resource need to be (re)initialized?
+     *
+     * @see \phpseclib3\Crypt\Twofish::setKey()
+     * @see \phpseclib3\Crypt\Twofish::setIV()
+     * @var bool
+     */
+    private $dechanged = true;
+
+    /**
+     * mcrypt resource for CFB mode
+     *
+     * mcrypt's CFB mode, in (and only in) buffered context,
+     * is broken, so phpseclib implements the CFB mode by it self,
+     * even when the mcrypt php extension is available.
+     *
+     * In order to do the CFB-mode work (fast) phpseclib
+     * use a separate ECB-mode mcrypt resource.
+     *
+     * @link http://phpseclib.sourceforge.net/cfb-demo.phps
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::setupMcrypt()
+     * @var resource
+     */
+    private $ecb;
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * Only relevant if $continuousBuffer enabled
+     * and $engine == self::ENGINE_MCRYPT
+     *
+     * It's faster to re-init $enmcrypt if
+     * $buffer bytes > $cfb_init_len than
+     * using the $ecb resource furthermore.
+     *
+     * This value depends of the chosen cipher
+     * and the time it would be needed for it's
+     * initialization [by mcrypt_generic_init()]
+     * which, typically, depends on the complexity
+     * on its internaly Key-expanding algorithm.
+     *
+     * @see self::encrypt()
+     * @var int
+     */
+    protected $cfb_init_len = 600;
+
+    /**
+     * Does internal cipher state need to be (re)initialized?
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     * @var bool
+     */
+    protected $changed = true;
+
+    /**
+     * Does Eval engie need to be (re)initialized?
+     *
+     * @see self::setup()
+     * @var bool
+     */
+    protected $nonIVChanged = true;
+
+    /**
+     * Padding status
+     *
+     * @see self::enablePadding()
+     * @var bool
+     */
+    private $padding = true;
+
+    /**
+     * Is the mode one that is paddable?
+     *
+     * @see self::__construct()
+     * @var bool
+     */
+    private $paddable = false;
+
+    /**
+     * Holds which crypt engine internaly should be use,
+     * which will be determined automatically on __construct()
+     *
+     * Currently available $engines are:
+     * - self::ENGINE_LIBSODIUM   (very fast, php-extension: libsodium, extension_loaded('libsodium') required)
+     * - self::ENGINE_OPENSSL_GCM (very fast, php-extension: openssl, extension_loaded('openssl') required)
+     * - self::ENGINE_OPENSSL     (very fast, php-extension: openssl, extension_loaded('openssl') required)
+     * - self::ENGINE_MCRYPT      (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
+     * - self::ENGINE_EVAL        (medium, pure php-engine, no php-extension required)
+     * - self::ENGINE_INTERNAL    (slower, pure php-engine, no php-extension required)
+     *
+     * @see self::setEngine()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @var int
+     */
+    protected $engine;
+
+    /**
+     * Holds the preferred crypt engine
+     *
+     * @see self::setEngine()
+     * @see self::setPreferredEngine()
+     * @var int
+     */
+    private $preferredEngine;
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * Only used if $engine == self::ENGINE_MCRYPT
+     *
+     * @link http://www.php.net/mcrypt_module_open
+     * @link http://www.php.net/mcrypt_list_algorithms
+     * @see self::setupMcrypt()
+     * @var string
+     */
+    protected $cipher_name_mcrypt;
+
+    /**
+     * The openssl specific name of the cipher
+     *
+     * Only used if $engine == self::ENGINE_OPENSSL
+     *
+     * @link http://www.php.net/openssl-get-cipher-methods
+     * @var string
+     */
+    protected $cipher_name_openssl;
+
+    /**
+     * The openssl specific name of the cipher in ECB mode
+     *
+     * If OpenSSL does not support the mode we're trying to use (CTR)
+     * it can still be emulated with ECB mode.
+     *
+     * @link http://www.php.net/openssl-get-cipher-methods
+     * @var string
+     */
+    protected $cipher_name_openssl_ecb;
+
+    /**
+     * The default salt used by setPassword()
+     *
+     * @see self::setPassword()
+     * @var string
+     */
+    private $password_default_salt = 'phpseclib/salt';
+
+    /**
+     * The name of the performance-optimized callback function
+     *
+     * Used by encrypt() / decrypt()
+     * only if $engine == self::ENGINE_INTERNAL
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::setupInlineCrypt()
+     * @var Callback
+     */
+    protected $inline_crypt;
+
+    /**
+     * If OpenSSL can be used in ECB but not in CTR we can emulate CTR
+     *
+     * @see self::openssl_ctr_process()
+     * @var bool
+     */
+    private $openssl_emulate_ctr = false;
+
+    /**
+     * Don't truncate / null pad key
+     *
+     * @see self::clearBuffers()
+     * @var bool
+     */
+    private $skip_key_adjustment = false;
+
+    /**
+     * Has the key length explicitly been set or should it be derived from the key, itself?
+     *
+     * @see self::setKeyLength()
+     * @var bool
+     */
+    protected $explicit_key_length = false;
+
+    /**
+     * Hash subkey for GHASH
+     *
+     * @see self::setupGCM()
+     * @see self::ghash()
+     * @var BinaryField\Integer
+     */
+    private $h;
+
+    /**
+     * Additional authenticated data
+     *
+     * @var string
+     */
+    protected $aad = '';
+
+    /**
+     * Authentication Tag produced after a round of encryption
+     *
+     * @var string
+     */
+    protected $newtag = false;
+
+    /**
+     * Authentication Tag to be verified during decryption
+     *
+     * @var string
+     */
+    protected $oldtag = false;
+
+    /**
+     * GCM Binary Field
+     *
+     * @see self::__construct()
+     * @see self::ghash()
+     * @var BinaryField
+     */
+    private static $gcmField;
+
+    /**
+     * Poly1305 Prime Field
+     *
+     * @see self::enablePoly1305()
+     * @see self::poly1305()
+     * @var PrimeField
+     */
+    private static $poly1305Field;
+
+    /**
+     * Flag for using regular vs "safe" intval
+     *
+     * @see self::initialize_static_variables()
+     * @var boolean
+     */
+    protected static $use_reg_intval;
+
+    /**
+     * Poly1305 Key
+     *
+     * @see self::setPoly1305Key()
+     * @see self::poly1305()
+     * @var string
+     */
+    protected $poly1305Key;
+
+    /**
+     * Poly1305 Flag
+     *
+     * @see self::setPoly1305Key()
+     * @see self::enablePoly1305()
+     * @var boolean
+     */
+    protected $usePoly1305 = false;
+
+    /**
+     * The Original Initialization Vector
+     *
+     * GCM uses the nonce to build the IV but we want to be able to distinguish between nonce-derived
+     * IV's and user-set IV's
+     *
+     * @see self::setIV()
+     * @var string
+     */
+    private $origIV = false;
+
+    /**
+     * Nonce
+     *
+     * Only used with GCM. We could re-use setIV() but nonce's can be of a different length and
+     * toggling between GCM and other modes could be more complicated if we re-used setIV()
+     *
+     * @see self::setNonce()
+     * @var string
+     */
+    protected $nonce = false;
+
+    /**
+     * Default Constructor.
+     *
+     * $mode could be:
+     *
+     * - ecb
+     *
+     * - cbc
+     *
+     * - ctr
+     *
+     * - cfb
+     *
+     * - cfb8
+     *
+     * - ofb
+     *
+     * - ofb8
+     *
+     * - gcm
+     *
+     * @param string $mode
+     * @throws BadModeException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        $mode = strtolower($mode);
+        // necessary because of 5.6 compatibility; we can't do isset(self::MODE_MAP[$mode]) in 5.6
+        $map = self::MODE_MAP;
+        if (!isset($map[$mode])) {
+            throw new BadModeException('No valid mode has been specified');
+        }
+
+        $mode = self::MODE_MAP[$mode];
+
+        // $mode dependent settings
+        switch ($mode) {
+            case self::MODE_ECB:
+            case self::MODE_CBC:
+                $this->paddable = true;
+                break;
+            case self::MODE_CTR:
+            case self::MODE_CFB:
+            case self::MODE_CFB8:
+            case self::MODE_OFB:
+            case self::MODE_OFB8:
+            case self::MODE_STREAM:
+                $this->paddable = false;
+                break;
+            case self::MODE_GCM:
+                if ($this->block_size != 16) {
+                    throw new BadModeException('GCM is only valid for block ciphers with a block size of 128 bits');
+                }
+                if (!isset(self::$gcmField)) {
+                    self::$gcmField = new BinaryField(128, 7, 2, 1, 0);
+                }
+                $this->paddable = false;
+                break;
+            default:
+                throw new BadModeException('No valid mode has been specified');
+        }
+
+        $this->mode = $mode;
+
+        static::initialize_static_variables();
+    }
+
+    /**
+     * Initialize static variables
+     */
+    protected static function initialize_static_variables()
+    {
+        if (!isset(self::$use_reg_intval)) {
+            switch (true) {
+                // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
+                case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
+                case !function_exists('php_uname'):
+                case !is_string(php_uname('m')):
+                case (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+                case defined('PHP_INT_SIZE') && PHP_INT_SIZE == 8:
+                    self::$use_reg_intval = true;
+                    break;
+                case (php_uname('m') & "\xDF\xDF\xDF") == 'ARM':
+                    switch (true) {
+                        /* PHP 7.0.0 introduced a bug that affected 32-bit ARM processors:
+
+                           https://github.com/php/php-src/commit/716da71446ebbd40fa6cf2cea8a4b70f504cc3cd
+
+                           altho the changelogs make no mention of it, this bug was fixed with this commit:
+
+                           https://github.com/php/php-src/commit/c1729272b17a1fe893d1a54e423d3b71470f3ee8
+
+                           affected versions of PHP are: 7.0.x, 7.1.0 - 7.1.23 and 7.2.0 - 7.2.11 */
+                        case PHP_VERSION_ID >= 70000 && PHP_VERSION_ID <= 70123:
+                        case PHP_VERSION_ID >= 70200 && PHP_VERSION_ID <= 70211:
+                            self::$use_reg_intval = false;
+                            break;
+                        default:
+                            self::$use_reg_intval = true;
+                    }
+            }
+        }
+    }
+
+    /**
+     * Sets the initialization vector.
+     *
+     * setIV() is not required when ecb or gcm modes are being used.
+     *
+     * {@internal Can be overwritten by a sub class, but does not have to be}
+     *
+     * @param string $iv
+     * @throws \LengthException if the IV length isn't equal to the block size
+     * @throws \BadMethodCallException if an IV is provided when one shouldn't be
+     */
+    public function setIV($iv)
+    {
+        if ($this->mode == self::MODE_ECB) {
+            throw new \BadMethodCallException('This mode does not require an IV.');
+        }
+
+        if ($this->mode == self::MODE_GCM) {
+            throw new \BadMethodCallException('Use setNonce instead');
+        }
+
+        if (!$this->usesIV()) {
+            throw new \BadMethodCallException('This algorithm does not use an IV.');
+        }
+
+        if (strlen($iv) != $this->block_size) {
+            throw new \LengthException('Received initialization vector of size ' . strlen($iv) . ', but size ' . $this->block_size . ' is required');
+        }
+
+        $this->iv = $this->origIV = $iv;
+        $this->changed = true;
+    }
+
+    /**
+     * Enables Poly1305 mode.
+     *
+     * Once enabled Poly1305 cannot be disabled.
+     *
+     * @throws \BadMethodCallException if Poly1305 is enabled whilst in GCM mode
+     */
+    public function enablePoly1305()
+    {
+        if ($this->mode == self::MODE_GCM) {
+            throw new \BadMethodCallException('Poly1305 cannot be used in GCM mode');
+        }
+
+        $this->usePoly1305 = true;
+    }
+
+    /**
+     * Enables Poly1305 mode.
+     *
+     * Once enabled Poly1305 cannot be disabled. If $key is not passed then an attempt to call createPoly1305Key
+     * will be made.
+     *
+     * @param string $key optional
+     * @throws \LengthException if the key isn't long enough
+     * @throws \BadMethodCallException if Poly1305 is enabled whilst in GCM mode
+     */
+    public function setPoly1305Key($key = null)
+    {
+        if ($this->mode == self::MODE_GCM) {
+            throw new \BadMethodCallException('Poly1305 cannot be used in GCM mode');
+        }
+
+        if (!is_string($key) || strlen($key) != 32) {
+            throw new \LengthException('The Poly1305 key must be 32 bytes long (256 bits)');
+        }
+
+        if (!isset(self::$poly1305Field)) {
+            // 2^130-5
+            self::$poly1305Field = new PrimeField(new BigInteger('3fffffffffffffffffffffffffffffffb', 16));
+        }
+
+        $this->poly1305Key = $key;
+        $this->usePoly1305 = true;
+    }
+
+    /**
+     * Sets the nonce.
+     *
+     * setNonce() is only required when gcm is used
+     *
+     * @param string $nonce
+     * @throws \BadMethodCallException if an nonce is provided when one shouldn't be
+     */
+    public function setNonce($nonce)
+    {
+        if ($this->mode != self::MODE_GCM) {
+            throw new \BadMethodCallException('Nonces are only used in GCM mode.');
+        }
+
+        $this->nonce = $nonce;
+        $this->setEngine();
+    }
+
+    /**
+     * Sets additional authenticated data
+     *
+     * setAAD() is only used by gcm or in poly1305 mode
+     *
+     * @param string $aad
+     * @throws \BadMethodCallException if mode isn't GCM or if poly1305 isn't being utilized
+     */
+    public function setAAD($aad)
+    {
+        if ($this->mode != self::MODE_GCM && !$this->usePoly1305) {
+            throw new \BadMethodCallException('Additional authenticated data is only utilized in GCM mode or with Poly1305');
+        }
+
+        $this->aad = $aad;
+    }
+
+    /**
+     * Returns whether or not the algorithm uses an IV
+     *
+     * @return bool
+     */
+    public function usesIV()
+    {
+        return $this->mode != self::MODE_GCM && $this->mode != self::MODE_ECB;
+    }
+
+    /**
+     * Returns whether or not the algorithm uses a nonce
+     *
+     * @return bool
+     */
+    public function usesNonce()
+    {
+        return $this->mode == self::MODE_GCM;
+    }
+
+    /**
+     * Returns the current key length in bits
+     *
+     * @return int
+     */
+    public function getKeyLength()
+    {
+        return $this->key_length << 3;
+    }
+
+    /**
+     * Returns the current block length in bits
+     *
+     * @return int
+     */
+    public function getBlockLength()
+    {
+        return $this->block_size << 3;
+    }
+
+    /**
+     * Returns the current block length in bytes
+     *
+     * @return int
+     */
+    public function getBlockLengthInBytes()
+    {
+        return $this->block_size;
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Keys with explicitly set lengths need to be treated accordingly
+     *
+     * @param int $length
+     */
+    public function setKeyLength($length)
+    {
+        $this->explicit_key_length = $length >> 3;
+
+        if (is_string($this->key) && strlen($this->key) != $this->explicit_key_length) {
+            $this->key = false;
+            throw new InconsistentSetupException('Key has already been set and is not ' . $this->explicit_key_length . ' bytes long');
+        }
+    }
+
+    /**
+     * Sets the key.
+     *
+     * The min/max length(s) of the key depends on the cipher which is used.
+     * If the key not fits the length(s) of the cipher it will paded with null bytes
+     * up to the closest valid key length.  If the key is more than max length,
+     * we trim the excess bits.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all null bytes.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @param string $key
+     */
+    public function setKey($key)
+    {
+        if ($this->explicit_key_length !== false && strlen($key) != $this->explicit_key_length) {
+            throw new InconsistentSetupException('Key length has already been set to ' . $this->explicit_key_length . ' bytes and this key is ' . strlen($key) . ' bytes');
+        }
+
+        $this->key = $key;
+        $this->key_length = strlen($key);
+        $this->setEngine();
+    }
+
+    /**
+     * Sets the password.
+     *
+     * Depending on what $method is set to, setPassword()'s (optional) parameters are as follows:
+     *     {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2} or pbkdf1:
+     *         $hash, $salt, $count, $dkLen
+     *
+     *         Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
+     *     {@link https://en.wikipedia.org/wiki/Bcrypt bcypt}:
+     *         $salt, $rounds, $keylen
+     *
+     *         This is a modified version of bcrypt used by OpenSSH.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see Crypt/Hash.php
+     * @param string $password
+     * @param string $method
+     * @param int|string ...$func_args
+     * @throws \LengthException if pbkdf1 is being used and the derived key length exceeds the hash length
+     * @throws \RuntimeException if bcrypt is being used and a salt isn't provided
+     * @return bool
+     */
+    public function setPassword($password, $method = 'pbkdf2', ...$func_args)
+    {
+        $key = '';
+
+        $method = strtolower($method);
+        switch ($method) {
+            case 'bcrypt':
+                if (!isset($func_args[2])) {
+                    throw new \RuntimeException('A salt must be provided for bcrypt to work');
+                }
+
+                $salt = $func_args[0];
+
+                $rounds = isset($func_args[1]) ? $func_args[1] : 16;
+                $keylen = isset($func_args[2]) ? $func_args[2] : $this->key_length;
+
+                $key = Blowfish::bcrypt_pbkdf($password, $salt, $keylen + $this->block_size, $rounds);
+
+                $this->setKey(substr($key, 0, $keylen));
+                $this->setIV(substr($key, $keylen));
+
+                return true;
+            case 'pkcs12': // from https://tools.ietf.org/html/rfc7292#appendix-B.2
+            case 'pbkdf1':
+            case 'pbkdf2':
+                // Hash function
+                $hash = isset($func_args[0]) ? strtolower($func_args[0]) : 'sha1';
+                $hashObj = new Hash();
+                $hashObj->setHash($hash);
+
+                // WPA and WPA2 use the SSID as the salt
+                $salt = isset($func_args[1]) ? $func_args[1] : $this->password_default_salt;
+
+                // RFC2898#section-4.2 uses 1,000 iterations by default
+                // WPA and WPA2 use 4,096.
+                $count = isset($func_args[2]) ? $func_args[2] : 1000;
+
+                // Keylength
+                if (isset($func_args[3])) {
+                    if ($func_args[3] <= 0) {
+                        throw new \LengthException('Derived key length cannot be longer 0 or less');
+                    }
+                    $dkLen = $func_args[3];
+                } else {
+                    $key_length = $this->explicit_key_length !== false ? $this->explicit_key_length : $this->key_length;
+                    $dkLen = $method == 'pbkdf1' ? 2 * $key_length : $key_length;
+                }
+
+                switch (true) {
+                    case $method == 'pkcs12':
+                        /*
+                         In this specification, however, all passwords are created from
+                         BMPStrings with a NULL terminator.  This means that each character in
+                         the original BMPString is encoded in 2 bytes in big-endian format
+                         (most-significant byte first).  There are no Unicode byte order
+                         marks.  The 2 bytes produced from the last character in the BMPString
+                         are followed by 2 additional bytes with the value 0x00.
+
+                         -- https://tools.ietf.org/html/rfc7292#appendix-B.1
+                         */
+                        $password = "\0" . chunk_split($password, 1, "\0") . "\0";
+
+                        /*
+                         This standard specifies 3 different values for the ID byte mentioned
+                         above:
+
+                         1.  If ID=1, then the pseudorandom bits being produced are to be used
+                             as key material for performing encryption or decryption.
+
+                         2.  If ID=2, then the pseudorandom bits being produced are to be used
+                             as an IV (Initial Value) for encryption or decryption.
+
+                         3.  If ID=3, then the pseudorandom bits being produced are to be used
+                             as an integrity key for MACing.
+                         */
+                        // Construct a string, D (the "diversifier"), by concatenating v/8
+                        // copies of ID.
+                        $blockLength = $hashObj->getBlockLengthInBytes();
+                        $d1 = str_repeat(chr(1), $blockLength);
+                        $d2 = str_repeat(chr(2), $blockLength);
+                        $s = '';
+                        if (strlen($salt)) {
+                            while (strlen($s) < $blockLength) {
+                                $s .= $salt;
+                            }
+                        }
+                        $s = substr($s, 0, $blockLength);
+
+                        $p = '';
+                        if (strlen($password)) {
+                            while (strlen($p) < $blockLength) {
+                                $p .= $password;
+                            }
+                        }
+                        $p = substr($p, 0, $blockLength);
+
+                        $i = $s . $p;
+
+                        $this->setKey(self::pkcs12helper($dkLen, $hashObj, $i, $d1, $count));
+                        if ($this->usesIV()) {
+                            $this->setIV(self::pkcs12helper($this->block_size, $hashObj, $i, $d2, $count));
+                        }
+
+                        return true;
+                    case $method == 'pbkdf1':
+                        if ($dkLen > $hashObj->getLengthInBytes()) {
+                            throw new \LengthException('Derived key length cannot be longer than the hash length');
+                        }
+                        $t = $password . $salt;
+                        for ($i = 0; $i < $count; ++$i) {
+                            $t = $hashObj->hash($t);
+                        }
+                        $key = substr($t, 0, $dkLen);
+
+                        $this->setKey(substr($key, 0, $dkLen >> 1));
+                        if ($this->usesIV()) {
+                            $this->setIV(substr($key, $dkLen >> 1));
+                        }
+
+                        return true;
+                    case !in_array($hash, hash_algos()):
+                        $i = 1;
+                        $hashObj->setKey($password);
+                        while (strlen($key) < $dkLen) {
+                            $f = $u = $hashObj->hash($salt . pack('N', $i++));
+                            for ($j = 2; $j <= $count; ++$j) {
+                                $u = $hashObj->hash($u);
+                                $f ^= $u;
+                            }
+                            $key .= $f;
+                        }
+                        $key = substr($key, 0, $dkLen);
+                        break;
+                    default:
+                        $key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true);
+                }
+                break;
+            default:
+                throw new UnsupportedAlgorithmException($method . ' is not a supported password hashing method');
+        }
+
+        $this->setKey($key);
+
+        return true;
+    }
+
+    /**
+     * PKCS#12 KDF Helper Function
+     *
+     * As discussed here:
+     *
+     * {@link https://tools.ietf.org/html/rfc7292#appendix-B}
+     *
+     * @see self::setPassword()
+     * @param int $n
+     * @param Hash $hashObj
+     * @param string $i
+     * @param string $d
+     * @param int $count
+     * @return string $a
+     */
+    private static function pkcs12helper($n, $hashObj, $i, $d, $count)
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        $blockLength = $hashObj->getBlockLength() >> 3;
+
+        $c = ceil($n / $hashObj->getLengthInBytes());
+        $a = '';
+        for ($j = 1; $j <= $c; $j++) {
+            $ai = $d . $i;
+            for ($k = 0; $k < $count; $k++) {
+                $ai = $hashObj->hash($ai);
+            }
+            $b = '';
+            while (strlen($b) < $blockLength) {
+                $b .= $ai;
+            }
+            $b = substr($b, 0, $blockLength);
+            $b = new BigInteger($b, 256);
+            $newi = '';
+            for ($k = 0; $k < strlen($i); $k += $blockLength) {
+                $temp = substr($i, $k, $blockLength);
+                $temp = new BigInteger($temp, 256);
+                $temp->setPrecision($blockLength << 3);
+                $temp = $temp->add($b);
+                $temp = $temp->add($one);
+                $newi .= $temp->toBytes(false);
+            }
+            $i = $newi;
+            $a .= $ai;
+        }
+
+        return substr($a, 0, $n);
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher
+     * implementations may or may not pad in the same manner.  Other common approaches to padding and the reasons why it's
+     * necessary are discussed in the following
+     * URL:
+     *
+     * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
+     *
+     * An alternative to padding is to, separately, send the length of the file.  This is what SSH, in fact, does.
+     * strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
+     * length.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    public function encrypt($plaintext)
+    {
+        if ($this->paddable) {
+            $plaintext = $this->pad($plaintext);
+        }
+
+        $this->setup();
+
+        if ($this->mode == self::MODE_GCM) {
+            $oldIV = $this->iv;
+            Strings::increment_str($this->iv);
+            $cipher = new static('ctr');
+            $cipher->setKey($this->key);
+            $cipher->setIV($this->iv);
+            $ciphertext = $cipher->encrypt($plaintext);
+
+            $s = $this->ghash(
+                self::nullPad128($this->aad) .
+                self::nullPad128($ciphertext) .
+                self::len64($this->aad) .
+                self::len64($ciphertext)
+            );
+            $cipher->encryptIV = $this->iv = $this->encryptIV = $this->decryptIV = $oldIV;
+            $this->newtag = $cipher->encrypt($s);
+            return $ciphertext;
+        }
+
+        if (isset($this->poly1305Key)) {
+            $cipher = clone $this;
+            unset($cipher->poly1305Key);
+            $this->usePoly1305 = false;
+            $ciphertext = $cipher->encrypt($plaintext);
+            $this->newtag = $this->poly1305($ciphertext);
+            return $ciphertext;
+        }
+
+        if ($this->engine === self::ENGINE_OPENSSL) {
+            switch ($this->mode) {
+                case self::MODE_STREAM:
+                    return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                case self::MODE_ECB:
+                    return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                case self::MODE_CBC:
+                    $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $this->encryptIV);
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = substr($result, -$this->block_size);
+                    }
+                    return $result;
+                case self::MODE_CTR:
+                    return $this->openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
+                case self::MODE_CFB:
+                    // cfb loosely routines inspired by openssl's:
+                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                    $ciphertext = '';
+                    if ($this->continuousBuffer) {
+                        $iv = &$this->encryptIV;
+                        $pos = &$this->enbuffer['pos'];
+                    } else {
+                        $iv = $this->encryptIV;
+                        $pos = 0;
+                    }
+                    $len = strlen($plaintext);
+                    $i = 0;
+                    if ($pos) {
+                        $orig_pos = $pos;
+                        $max = $this->block_size - $pos;
+                        if ($len >= $max) {
+                            $i = $max;
+                            $len -= $max;
+                            $pos = 0;
+                        } else {
+                            $i = $len;
+                            $pos += $len;
+                            $len = 0;
+                        }
+                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                        $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                        $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                        $plaintext = substr($plaintext, $i);
+                    }
+
+                    $overflow = $len % $this->block_size;
+
+                    if ($overflow) {
+                        $ciphertext .= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
+                        $iv = Strings::pop($ciphertext, $this->block_size);
+
+                        $size = $len - $overflow;
+                        $block = $iv ^ substr($plaintext, -$overflow);
+                        $iv = substr_replace($iv, $block, 0, $overflow);
+                        $ciphertext .= $block;
+                        $pos = $overflow;
+                    } elseif ($len) {
+                        $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
+                        $iv = substr($ciphertext, -$this->block_size);
+                    }
+
+                    return $ciphertext;
+                case self::MODE_CFB8:
+                    $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $this->encryptIV);
+                    if ($this->continuousBuffer) {
+                        if (($len = strlen($ciphertext)) >= $this->block_size) {
+                            $this->encryptIV = substr($ciphertext, -$this->block_size);
+                        } else {
+                            $this->encryptIV = substr($this->encryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
+                        }
+                    }
+                    return $ciphertext;
+                case self::MODE_OFB8:
+                    $ciphertext = '';
+                    $len = strlen($plaintext);
+                    $iv = $this->encryptIV;
+
+                    for ($i = 0; $i < $len; ++$i) {
+                        $xor = openssl_encrypt($iv, $this->cipher_name_openssl_ecb, $this->key, $this->openssl_options, $this->decryptIV);
+                        $ciphertext .= $plaintext[$i] ^ $xor;
+                        $iv = substr($iv, 1) . $xor[0];
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = $iv;
+                    }
+                    break;
+                case self::MODE_OFB:
+                    return $this->openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
+            }
+        }
+
+        if ($this->engine === self::ENGINE_MCRYPT) {
+            set_error_handler(function () {
+            });
+            if ($this->enchanged) {
+                mcrypt_generic_init($this->enmcrypt, $this->key, $this->getIV($this->encryptIV));
+                $this->enchanged = false;
+            }
+
+            // re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
+            // using mcrypt's default handing of CFB the above would output two different things.  using phpseclib's
+            // rewritten CFB implementation the above outputs the same thing twice.
+            if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
+                $block_size = $this->block_size;
+                $iv = &$this->encryptIV;
+                $pos = &$this->enbuffer['pos'];
+                $len = strlen($plaintext);
+                $ciphertext = '';
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len -= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos += $len;
+                        $len = 0;
+                    }
+                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                    $this->enbuffer['enmcrypt_init'] = true;
+                }
+                if ($len >= $block_size) {
+                    if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
+                        if ($this->enbuffer['enmcrypt_init'] === true) {
+                            mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
+                            $this->enbuffer['enmcrypt_init'] = false;
+                        }
+                        $ciphertext .= mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
+                        $iv = substr($ciphertext, -$block_size);
+                        $len %= $block_size;
+                    } else {
+                        while ($len >= $block_size) {
+                            $iv = mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
+                            $ciphertext .= $iv;
+                            $len -= $block_size;
+                            $i += $block_size;
+                        }
+                    }
+                }
+
+                if ($len) {
+                    $iv = mcrypt_generic($this->ecb, $iv);
+                    $block = $iv ^ substr($plaintext, -$len);
+                    $iv = substr_replace($iv, $block, 0, $len);
+                    $ciphertext .= $block;
+                    $pos = $len;
+                }
+
+                restore_error_handler();
+
+                return $ciphertext;
+            }
+
+            $ciphertext = mcrypt_generic($this->enmcrypt, $plaintext);
+
+            if (!$this->continuousBuffer) {
+                mcrypt_generic_init($this->enmcrypt, $this->key, $this->getIV($this->encryptIV));
+            }
+
+            restore_error_handler();
+
+            return $ciphertext;
+        }
+
+        if ($this->engine === self::ENGINE_EVAL) {
+            $inline = $this->inline_crypt;
+            return $inline('encrypt', $plaintext);
+        }
+
+        $buffer = &$this->enbuffer;
+        $block_size = $this->block_size;
+        $ciphertext = '';
+        switch ($this->mode) {
+            case self::MODE_ECB:
+                for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                    $ciphertext .= $this->encryptBlock(substr($plaintext, $i, $block_size));
+                }
+                break;
+            case self::MODE_CBC:
+                $xor = $this->encryptIV;
+                for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $block = $this->encryptBlock($block ^ $xor);
+                    $xor = $block;
+                    $ciphertext .= $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                }
+                break;
+            case self::MODE_CTR:
+                $xor = $this->encryptIV;
+                if (strlen($buffer['ciphertext'])) {
+                    for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['ciphertext'])) {
+                            $buffer['ciphertext'] .= $this->encryptBlock($xor);
+                            Strings::increment_str($xor);
+                        }
+                        $key = Strings::shift($buffer['ciphertext'], $block_size);
+                        $ciphertext .= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        $key = $this->encryptBlock($xor);
+                        Strings::increment_str($xor);
+                        $ciphertext .= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                    if ($start = strlen($plaintext) % $block_size) {
+                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case self::MODE_CFB:
+                // cfb loosely routines inspired by openssl's:
+                // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                if ($this->continuousBuffer) {
+                    $iv = &$this->encryptIV;
+                    $pos = &$buffer['pos'];
+                } else {
+                    $iv = $this->encryptIV;
+                    $pos = 0;
+                }
+                $len = strlen($plaintext);
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len -= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos += $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                }
+                while ($len >= $block_size) {
+                    $iv = $this->encryptBlock($iv) ^ substr($plaintext, $i, $block_size);
+                    $ciphertext .= $iv;
+                    $len -= $block_size;
+                    $i += $block_size;
+                }
+                if ($len) {
+                    $iv = $this->encryptBlock($iv);
+                    $block = $iv ^ substr($plaintext, $i);
+                    $iv = substr_replace($iv, $block, 0, $len);
+                    $ciphertext .= $block;
+                    $pos = $len;
+                }
+                break;
+            case self::MODE_CFB8:
+                $ciphertext = '';
+                $len = strlen($plaintext);
+                $iv = $this->encryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $ciphertext .= ($c = $plaintext[$i] ^ $this->encryptBlock($iv));
+                    $iv = substr($iv, 1) . $c;
+                }
+
+                if ($this->continuousBuffer) {
+                    if ($len >= $block_size) {
+                        $this->encryptIV = substr($ciphertext, -$block_size);
+                    } else {
+                        $this->encryptIV = substr($this->encryptIV, $len - $block_size) . substr($ciphertext, -$len);
+                    }
+                }
+                break;
+            case self::MODE_OFB8:
+                $ciphertext = '';
+                $len = strlen($plaintext);
+                $iv = $this->encryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $xor = $this->encryptBlock($iv);
+                    $ciphertext .= $plaintext[$i] ^ $xor;
+                    $iv = substr($iv, 1) . $xor[0];
+                }
+
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $iv;
+                }
+                break;
+            case self::MODE_OFB:
+                $xor = $this->encryptIV;
+                if (strlen($buffer['xor'])) {
+                    for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['xor'])) {
+                            $xor = $this->encryptBlock($xor);
+                            $buffer['xor'] .= $xor;
+                        }
+                        $key = Strings::shift($buffer['xor'], $block_size);
+                        $ciphertext .= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                        $xor = $this->encryptBlock($xor);
+                        $ciphertext .= substr($plaintext, $i, $block_size) ^ $xor;
+                    }
+                    $key = $xor;
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                    if ($start = strlen($plaintext) % $block_size) {
+                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+                    }
+                }
+                break;
+            case self::MODE_STREAM:
+                $ciphertext = $this->encryptBlock($plaintext);
+                break;
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
+     * it is.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::encrypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     * @throws \LengthException if we're inside a block cipher and the ciphertext length is not a multiple of the block size
+     */
+    public function decrypt($ciphertext)
+    {
+        if ($this->paddable && strlen($ciphertext) % $this->block_size) {
+            throw new \LengthException('The ciphertext length (' . strlen($ciphertext) . ') needs to be a multiple of the block size (' . $this->block_size . ')');
+        }
+        $this->setup();
+
+        if ($this->mode == self::MODE_GCM || isset($this->poly1305Key)) {
+            if ($this->oldtag === false) {
+                throw new InsufficientSetupException('Authentication Tag has not been set');
+            }
+
+            if (isset($this->poly1305Key)) {
+                $newtag = $this->poly1305($ciphertext);
+            } else {
+                $oldIV = $this->iv;
+                Strings::increment_str($this->iv);
+                $cipher = new static('ctr');
+                $cipher->setKey($this->key);
+                $cipher->setIV($this->iv);
+                $plaintext = $cipher->decrypt($ciphertext);
+
+                $s = $this->ghash(
+                    self::nullPad128($this->aad) .
+                    self::nullPad128($ciphertext) .
+                    self::len64($this->aad) .
+                    self::len64($ciphertext)
+                );
+                $cipher->encryptIV = $this->iv = $this->encryptIV = $this->decryptIV = $oldIV;
+                $newtag = $cipher->encrypt($s);
+            }
+            if ($this->oldtag != substr($newtag, 0, strlen($newtag))) {
+                $cipher = clone $this;
+                unset($cipher->poly1305Key);
+                $this->usePoly1305 = false;
+                $plaintext = $cipher->decrypt($ciphertext);
+                $this->oldtag = false;
+                throw new BadDecryptionException('Derived authentication tag and supplied authentication tag do not match');
+            }
+            $this->oldtag = false;
+            return $plaintext;
+        }
+
+        if ($this->engine === self::ENGINE_OPENSSL) {
+            switch ($this->mode) {
+                case self::MODE_STREAM:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                    break;
+                case self::MODE_ECB:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                    break;
+                case self::MODE_CBC:
+                    $offset = $this->block_size;
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $this->decryptIV);
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
+                    }
+                    break;
+                case self::MODE_CTR:
+                    $plaintext = $this->openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
+                    break;
+                case self::MODE_CFB:
+                    // cfb loosely routines inspired by openssl's:
+                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                    $plaintext = '';
+                    if ($this->continuousBuffer) {
+                        $iv = &$this->decryptIV;
+                        $pos = &$this->debuffer['pos'];
+                    } else {
+                        $iv = $this->decryptIV;
+                        $pos = 0;
+                    }
+                    $len = strlen($ciphertext);
+                    $i = 0;
+                    if ($pos) {
+                        $orig_pos = $pos;
+                        $max = $this->block_size - $pos;
+                        if ($len >= $max) {
+                            $i = $max;
+                            $len -= $max;
+                            $pos = 0;
+                        } else {
+                            $i = $len;
+                            $pos += $len;
+                            $len = 0;
+                        }
+                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $this->blocksize
+                        $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                        $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                        $ciphertext = substr($ciphertext, $i);
+                    }
+                    $overflow = $len % $this->block_size;
+                    if ($overflow) {
+                        $plaintext .= openssl_decrypt(substr($ciphertext, 0, -$overflow), $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
+                        if ($len - $overflow) {
+                            $iv = substr($ciphertext, -$overflow - $this->block_size, -$overflow);
+                        }
+                        $iv = openssl_encrypt(str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
+                        $plaintext .= $iv ^ substr($ciphertext, -$overflow);
+                        $iv = substr_replace($iv, substr($ciphertext, -$overflow), 0, $overflow);
+                        $pos = $overflow;
+                    } elseif ($len) {
+                        $plaintext .= openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
+                        $iv = substr($ciphertext, -$this->block_size);
+                    }
+                    break;
+                case self::MODE_CFB8:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $this->decryptIV);
+                    if ($this->continuousBuffer) {
+                        if (($len = strlen($ciphertext)) >= $this->block_size) {
+                            $this->decryptIV = substr($ciphertext, -$this->block_size);
+                        } else {
+                            $this->decryptIV = substr($this->decryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
+                        }
+                    }
+                    break;
+                case self::MODE_OFB8:
+                    $plaintext = '';
+                    $len = strlen($ciphertext);
+                    $iv = $this->decryptIV;
+
+                    for ($i = 0; $i < $len; ++$i) {
+                        $xor = openssl_encrypt($iv, $this->cipher_name_openssl_ecb, $this->key, $this->openssl_options, $this->decryptIV);
+                        $plaintext .= $ciphertext[$i] ^ $xor;
+                        $iv = substr($iv, 1) . $xor[0];
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = $iv;
+                    }
+                    break;
+                case self::MODE_OFB:
+                    $plaintext = $this->openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
+            }
+
+            return $this->paddable ? $this->unpad($plaintext) : $plaintext;
+        }
+
+        if ($this->engine === self::ENGINE_MCRYPT) {
+            set_error_handler(function () {
+            });
+            $block_size = $this->block_size;
+            if ($this->dechanged) {
+                mcrypt_generic_init($this->demcrypt, $this->key, $this->getIV($this->decryptIV));
+                $this->dechanged = false;
+            }
+
+            if ($this->mode == self::MODE_CFB && $this->continuousBuffer) {
+                $iv = &$this->decryptIV;
+                $pos = &$this->debuffer['pos'];
+                $len = strlen($ciphertext);
+                $plaintext = '';
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len -= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos += $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                }
+                if ($len >= $block_size) {
+                    $cb = substr($ciphertext, $i, $len - $len % $block_size);
+                    $plaintext .= mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
+                    $iv = substr($cb, -$block_size);
+                    $len %= $block_size;
+                }
+                if ($len) {
+                    $iv = mcrypt_generic($this->ecb, $iv);
+                    $plaintext .= $iv ^ substr($ciphertext, -$len);
+                    $iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
+                    $pos = $len;
+                }
+
+                restore_error_handler();
+
+                return $plaintext;
+            }
+
+            $plaintext = mdecrypt_generic($this->demcrypt, $ciphertext);
+
+            if (!$this->continuousBuffer) {
+                mcrypt_generic_init($this->demcrypt, $this->key, $this->getIV($this->decryptIV));
+            }
+
+            restore_error_handler();
+
+            return $this->paddable ? $this->unpad($plaintext) : $plaintext;
+        }
+
+        if ($this->engine === self::ENGINE_EVAL) {
+            $inline = $this->inline_crypt;
+            return $inline('decrypt', $ciphertext);
+        }
+
+        $block_size = $this->block_size;
+
+        $buffer = &$this->debuffer;
+        $plaintext = '';
+        switch ($this->mode) {
+            case self::MODE_ECB:
+                for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                    $plaintext .= $this->decryptBlock(substr($ciphertext, $i, $block_size));
+                }
+                break;
+            case self::MODE_CBC:
+                $xor = $this->decryptIV;
+                for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                    $block = substr($ciphertext, $i, $block_size);
+                    $plaintext .= $this->decryptBlock($block) ^ $xor;
+                    $xor = $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                }
+                break;
+            case self::MODE_CTR:
+                $xor = $this->decryptIV;
+                if (strlen($buffer['ciphertext'])) {
+                    for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['ciphertext'])) {
+                            $buffer['ciphertext'] .= $this->encryptBlock($xor);
+                            Strings::increment_str($xor);
+                        }
+                        $key = Strings::shift($buffer['ciphertext'], $block_size);
+                        $plaintext .= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        $key = $this->encryptBlock($xor);
+                        Strings::increment_str($xor);
+                        $plaintext .= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                    if ($start = strlen($ciphertext) % $block_size) {
+                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case self::MODE_CFB:
+                if ($this->continuousBuffer) {
+                    $iv = &$this->decryptIV;
+                    $pos = &$buffer['pos'];
+                } else {
+                    $iv = $this->decryptIV;
+                    $pos = 0;
+                }
+                $len = strlen($ciphertext);
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len -= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos += $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                }
+                while ($len >= $block_size) {
+                    $iv = $this->encryptBlock($iv);
+                    $cb = substr($ciphertext, $i, $block_size);
+                    $plaintext .= $iv ^ $cb;
+                    $iv = $cb;
+                    $len -= $block_size;
+                    $i += $block_size;
+                }
+                if ($len) {
+                    $iv = $this->encryptBlock($iv);
+                    $plaintext .= $iv ^ substr($ciphertext, $i);
+                    $iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
+                    $pos = $len;
+                }
+                break;
+            case self::MODE_CFB8:
+                $plaintext = '';
+                $len = strlen($ciphertext);
+                $iv = $this->decryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $plaintext .= $ciphertext[$i] ^ $this->encryptBlock($iv);
+                    $iv = substr($iv, 1) . $ciphertext[$i];
+                }
+
+                if ($this->continuousBuffer) {
+                    if ($len >= $block_size) {
+                        $this->decryptIV = substr($ciphertext, -$block_size);
+                    } else {
+                        $this->decryptIV = substr($this->decryptIV, $len - $block_size) . substr($ciphertext, -$len);
+                    }
+                }
+                break;
+            case self::MODE_OFB8:
+                $plaintext = '';
+                $len = strlen($ciphertext);
+                $iv = $this->decryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $xor = $this->encryptBlock($iv);
+                    $plaintext .= $ciphertext[$i] ^ $xor;
+                    $iv = substr($iv, 1) . $xor[0];
+                }
+
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $iv;
+                }
+                break;
+            case self::MODE_OFB:
+                $xor = $this->decryptIV;
+                if (strlen($buffer['xor'])) {
+                    for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['xor'])) {
+                            $xor = $this->encryptBlock($xor);
+                            $buffer['xor'] .= $xor;
+                        }
+                        $key = Strings::shift($buffer['xor'], $block_size);
+                        $plaintext .= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($ciphertext); $i += $block_size) {
+                        $xor = $this->encryptBlock($xor);
+                        $plaintext .= substr($ciphertext, $i, $block_size) ^ $xor;
+                    }
+                    $key = $xor;
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                    if ($start = strlen($ciphertext) % $block_size) {
+                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+                    }
+                }
+                break;
+            case self::MODE_STREAM:
+                $plaintext = $this->decryptBlock($ciphertext);
+                break;
+        }
+        return $this->paddable ? $this->unpad($plaintext) : $plaintext;
+    }
+
+    /**
+     * Get the authentication tag
+     *
+     * Only used in GCM or Poly1305 mode
+     *
+     * @see self::encrypt()
+     * @param int $length optional
+     * @return string
+     * @throws \LengthException if $length isn't of a sufficient length
+     * @throws \RuntimeException if GCM mode isn't being used
+     */
+    public function getTag($length = 16)
+    {
+        if ($this->mode != self::MODE_GCM && !$this->usePoly1305) {
+            throw new \BadMethodCallException('Authentication tags are only utilized in GCM mode or with Poly1305');
+        }
+
+        if ($this->newtag === false) {
+            throw new \BadMethodCallException('A tag can only be returned after a round of encryption has been performed');
+        }
+
+        // the tag is 128-bits. it can't be greater than 16 bytes because that's bigger than the tag is. if it
+        // were 0 you might as well be doing CTR and less than 4 provides minimal security that could be trivially
+        // easily brute forced.
+        // see https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf#page=36
+        // for more info
+        if ($length < 4 || $length > 16) {
+            throw new \LengthException('The authentication tag must be between 4 and 16 bytes long');
+        }
+
+        return $length == 16 ?
+            $this->newtag :
+            substr($this->newtag, 0, $length);
+    }
+
+    /**
+     * Sets the authentication tag
+     *
+     * Only used in GCM mode
+     *
+     * @see self::decrypt()
+     * @param string $tag
+     * @throws \LengthException if $length isn't of a sufficient length
+     * @throws \RuntimeException if GCM mode isn't being used
+     */
+    public function setTag($tag)
+    {
+        if ($this->usePoly1305 && !isset($this->poly1305Key) && method_exists($this, 'createPoly1305Key')) {
+            $this->createPoly1305Key();
+        }
+
+        if ($this->mode != self::MODE_GCM && !$this->usePoly1305) {
+            throw new \BadMethodCallException('Authentication tags are only utilized in GCM mode or with Poly1305');
+        }
+
+        $length = strlen($tag);
+        if ($length < 4 || $length > 16) {
+            throw new \LengthException('The authentication tag must be between 4 and 16 bytes long');
+        }
+        $this->oldtag = $tag;
+    }
+
+    /**
+     * Get the IV
+     *
+     * mcrypt requires an IV even if ECB is used
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $iv
+     * @return string
+     */
+    protected function getIV($iv)
+    {
+        return $this->mode == self::MODE_ECB ? str_repeat("\0", $this->block_size) : $iv;
+    }
+
+    /**
+     * OpenSSL CTR Processor
+     *
+     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+     * for CTR is the same for both encrypting and decrypting this function is re-used by both SymmetricKey::encrypt()
+     * and SymmetricKey::decrypt(). Also, OpenSSL doesn't implement CTR for all of it's symmetric ciphers so this
+     * function will emulate CTR with ECB when necessary.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @param string $encryptIV
+     * @param array $buffer
+     * @return string
+     */
+    private function openssl_ctr_process($plaintext, &$encryptIV, &$buffer)
+    {
+        $ciphertext = '';
+
+        $block_size = $this->block_size;
+        $key = $this->key;
+
+        if ($this->openssl_emulate_ctr) {
+            $xor = $encryptIV;
+            if (strlen($buffer['ciphertext'])) {
+                for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    if (strlen($block) > strlen($buffer['ciphertext'])) {
+                        $buffer['ciphertext'] .= openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                    }
+                    Strings::increment_str($xor);
+                    $otp = Strings::shift($buffer['ciphertext'], $block_size);
+                    $ciphertext .= $block ^ $otp;
+                }
+            } else {
+                for ($i = 0; $i < strlen($plaintext); $i += $block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $otp = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                    Strings::increment_str($xor);
+                    $ciphertext .= $block ^ $otp;
+                }
+            }
+            if ($this->continuousBuffer) {
+                $encryptIV = $xor;
+                if ($start = strlen($plaintext) % $block_size) {
+                    $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                }
+            }
+
+            return $ciphertext;
+        }
+
+        if (strlen($buffer['ciphertext'])) {
+            $ciphertext = $plaintext ^ Strings::shift($buffer['ciphertext'], strlen($plaintext));
+            $plaintext = substr($plaintext, strlen($ciphertext));
+
+            if (!strlen($plaintext)) {
+                return $ciphertext;
+            }
+        }
+
+        $overflow = strlen($plaintext) % $block_size;
+        if ($overflow) {
+            $plaintext2 = Strings::pop($plaintext, $overflow); // ie. trim $plaintext to a multiple of $block_size and put rest of $plaintext in $plaintext2
+            $encrypted = openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $encryptIV);
+            $temp = Strings::pop($encrypted, $block_size);
+            $ciphertext .= $encrypted . ($plaintext2 ^ $temp);
+            if ($this->continuousBuffer) {
+                $buffer['ciphertext'] = substr($temp, $overflow);
+                $encryptIV = $temp;
+            }
+        } elseif (!strlen($buffer['ciphertext'])) {
+            $ciphertext .= openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $encryptIV);
+            $temp = Strings::pop($ciphertext, $block_size);
+            if ($this->continuousBuffer) {
+                $encryptIV = $temp;
+            }
+        }
+        if ($this->continuousBuffer) {
+            $encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+            if ($overflow) {
+                Strings::increment_str($encryptIV);
+            }
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * OpenSSL OFB Processor
+     *
+     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+     * for OFB is the same for both encrypting and decrypting this function is re-used by both SymmetricKey::encrypt()
+     * and SymmetricKey::decrypt().
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @param string $encryptIV
+     * @param array $buffer
+     * @return string
+     */
+    private function openssl_ofb_process($plaintext, &$encryptIV, &$buffer)
+    {
+        if (strlen($buffer['xor'])) {
+            $ciphertext = $plaintext ^ $buffer['xor'];
+            $buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
+            $plaintext = substr($plaintext, strlen($ciphertext));
+        } else {
+            $ciphertext = '';
+        }
+
+        $block_size = $this->block_size;
+
+        $len = strlen($plaintext);
+        $key = $this->key;
+        $overflow = $len % $block_size;
+
+        if (strlen($plaintext)) {
+            if ($overflow) {
+                $ciphertext .= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $encryptIV);
+                $xor = Strings::pop($ciphertext, $block_size);
+                if ($this->continuousBuffer) {
+                    $encryptIV = $xor;
+                }
+                $ciphertext .= Strings::shift($xor, $overflow) ^ substr($plaintext, -$overflow);
+                if ($this->continuousBuffer) {
+                    $buffer['xor'] = $xor;
+                }
+            } else {
+                $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $encryptIV);
+                if ($this->continuousBuffer) {
+                    $encryptIV = substr($ciphertext, -$block_size) ^ substr($plaintext, -$block_size);
+                }
+            }
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * phpseclib <-> OpenSSL Mode Mapper
+     *
+     * May need to be overwritten by classes extending this one in some cases
+     *
+     * @return string
+     */
+    protected function openssl_translate_mode()
+    {
+        switch ($this->mode) {
+            case self::MODE_ECB:
+                return 'ecb';
+            case self::MODE_CBC:
+                return 'cbc';
+            case self::MODE_CTR:
+            case self::MODE_GCM:
+                return 'ctr';
+            case self::MODE_CFB:
+                return 'cfb';
+            case self::MODE_CFB8:
+                return 'cfb8';
+            case self::MODE_OFB:
+                return 'ofb';
+        }
+    }
+
+    /**
+     * Pad "packets".
+     *
+     * Block ciphers working by encrypting between their specified [$this->]block_size at a time
+     * If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
+     * pad the input so that it is of the proper length.
+     *
+     * Padding is enabled by default.  Sometimes, however, it is undesirable to pad strings.  Such is the case in SSH,
+     * where "packets" are padded with random bytes before being encrypted.  Unpad these packets and you risk stripping
+     * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
+     * transmitted separately)
+     *
+     * @see self::disablePadding()
+     */
+    public function enablePadding()
+    {
+        $this->padding = true;
+    }
+
+    /**
+     * Do not pad packets.
+     *
+     * @see self::enablePadding()
+     */
+    public function disablePadding()
+    {
+        $this->padding = false;
+    }
+
+    /**
+     * Treat consecutive "packets" as if they are a continuous buffer.
+     *
+     * Say you have a 32-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
+     * will yield different outputs:
+     *
+     * <code>
+     *    echo $rijndael->encrypt(substr($plaintext,  0, 16));
+     *    echo $rijndael->encrypt(substr($plaintext, 16, 16));
+     * </code>
+     * <code>
+     *    echo $rijndael->encrypt($plaintext);
+     * </code>
+     *
+     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
+     * another, as demonstrated with the following:
+     *
+     * <code>
+     *    $rijndael->encrypt(substr($plaintext, 0, 16));
+     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     * <code>
+     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of the \phpseclib3\Crypt\*() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you problems.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::disableContinuousBuffer()
+     */
+    public function enableContinuousBuffer()
+    {
+        if ($this->mode == self::MODE_ECB) {
+            return;
+        }
+
+        if ($this->mode == self::MODE_GCM) {
+            throw new \BadMethodCallException('This mode does not run in continuous mode');
+        }
+
+        $this->continuousBuffer = true;
+
+        $this->setEngine();
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::enableContinuousBuffer()
+     */
+    public function disableContinuousBuffer()
+    {
+        if ($this->mode == self::MODE_ECB) {
+            return;
+        }
+        if (!$this->continuousBuffer) {
+            return;
+        }
+
+        $this->continuousBuffer = false;
+
+        $this->setEngine();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see self::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        switch ($engine) {
+            case self::ENGINE_OPENSSL:
+                $this->openssl_emulate_ctr = false;
+                $result = $this->cipher_name_openssl &&
+                          extension_loaded('openssl');
+                if (!$result) {
+                    return false;
+                }
+
+                $methods = openssl_get_cipher_methods();
+                if (in_array($this->cipher_name_openssl, $methods)) {
+                    return true;
+                }
+                // not all of openssl's symmetric cipher's support ctr. for those
+                // that don't we'll emulate it
+                switch ($this->mode) {
+                    case self::MODE_CTR:
+                        if (in_array($this->cipher_name_openssl_ecb, $methods)) {
+                            $this->openssl_emulate_ctr = true;
+                            return true;
+                        }
+                }
+                return false;
+            case self::ENGINE_MCRYPT:
+                set_error_handler(function () {
+                });
+                $result = $this->cipher_name_mcrypt &&
+                          extension_loaded('mcrypt') &&
+                          in_array($this->cipher_name_mcrypt, mcrypt_list_algorithms());
+                restore_error_handler();
+                return $result;
+            case self::ENGINE_EVAL:
+                return method_exists($this, 'setupInlineCrypt');
+            case self::ENGINE_INTERNAL:
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see self::__construct()
+     * @param string $engine
+     * @return bool
+     */
+    public function isValidEngine($engine)
+    {
+        static $reverseMap;
+        if (!isset($reverseMap)) {
+            $reverseMap = array_map('strtolower', self::ENGINE_MAP);
+            $reverseMap = array_flip($reverseMap);
+        }
+        $engine = strtolower($engine);
+        if (!isset($reverseMap[$engine])) {
+            return false;
+        }
+
+        return $this->isValidEngineHelper($reverseMap[$engine]);
+    }
+
+    /**
+     * Sets the preferred crypt engine
+     *
+     * Currently, $engine could be:
+     *
+     * - libsodium[very fast]
+     *
+     * - OpenSSL  [very fast]
+     *
+     * - mcrypt   [fast]
+     *
+     * - Eval     [slow]
+     *
+     * - PHP      [slowest]
+     *
+     * If the preferred crypt engine is not available the fastest available one will be used
+     *
+     * @see self::__construct()
+     * @param string $engine
+     */
+    public function setPreferredEngine($engine)
+    {
+        static $reverseMap;
+        if (!isset($reverseMap)) {
+            $reverseMap = array_map('strtolower', self::ENGINE_MAP);
+            $reverseMap = array_flip($reverseMap);
+        }
+        $engine = is_string($engine) ? strtolower($engine) : '';
+        $this->preferredEngine = isset($reverseMap[$engine]) ? $reverseMap[$engine] : self::ENGINE_LIBSODIUM;
+
+        $this->setEngine();
+    }
+
+    /**
+     * Returns the engine currently being utilized
+     *
+     * @see self::setEngine()
+     */
+    public function getEngine()
+    {
+        return self::ENGINE_MAP[$this->engine];
+    }
+
+    /**
+     * Sets the engine as appropriate
+     *
+     * @see self::__construct()
+     */
+    protected function setEngine()
+    {
+        $this->engine = null;
+
+        $candidateEngines = [
+            self::ENGINE_LIBSODIUM,
+            self::ENGINE_OPENSSL_GCM,
+            self::ENGINE_OPENSSL,
+            self::ENGINE_MCRYPT,
+            self::ENGINE_EVAL
+        ];
+        if (isset($this->preferredEngine)) {
+            $temp = [$this->preferredEngine];
+            $candidateEngines = array_merge(
+                $temp,
+                array_diff($candidateEngines, $temp)
+            );
+        }
+        foreach ($candidateEngines as $engine) {
+            if ($this->isValidEngineHelper($engine)) {
+                $this->engine = $engine;
+                break;
+            }
+        }
+        if (!$this->engine) {
+            $this->engine = self::ENGINE_INTERNAL;
+        }
+
+        if ($this->engine != self::ENGINE_MCRYPT && $this->enmcrypt) {
+            set_error_handler(function () {
+            });
+            // Closing the current mcrypt resource(s). _mcryptSetup() will, if needed,
+            // (re)open them with the module named in $this->cipher_name_mcrypt
+            mcrypt_module_close($this->enmcrypt);
+            mcrypt_module_close($this->demcrypt);
+            $this->enmcrypt = null;
+            $this->demcrypt = null;
+
+            if ($this->ecb) {
+                mcrypt_module_close($this->ecb);
+                $this->ecb = null;
+            }
+            restore_error_handler();
+        }
+
+        $this->changed = $this->nonIVChanged = true;
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * Note: Must be extended by the child \phpseclib3\Crypt\* class
+     *
+     * @param string $in
+     * @return string
+     */
+    abstract protected function encryptBlock($in);
+
+    /**
+     * Decrypts a block
+     *
+     * Note: Must be extended by the child \phpseclib3\Crypt\* class
+     *
+     * @param string $in
+     * @return string
+     */
+    abstract protected function decryptBlock($in);
+
+    /**
+     * Setup the key (expansion)
+     *
+     * Only used if $engine == self::ENGINE_INTERNAL
+     *
+     * Note: Must extend by the child \phpseclib3\Crypt\* class
+     *
+     * @see self::setup()
+     */
+    abstract protected function setupKey();
+
+    /**
+     * Setup the self::ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine and flush all $buffers
+     * Used (only) if $engine == self::ENGINE_INTERNAL
+     *
+     * _setup() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setIV()
+     *
+     * - disableContinuousBuffer()
+     *
+     * - First run of encrypt() / decrypt() with no init-settings
+     *
+     * {@internal setup() is always called before en/decryption.}
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     */
+    protected function setup()
+    {
+        if (!$this->changed) {
+            return;
+        }
+
+        $this->changed = false;
+
+        if ($this->usePoly1305 && !isset($this->poly1305Key) && method_exists($this, 'createPoly1305Key')) {
+            $this->createPoly1305Key();
+        }
+
+        $this->enbuffer = $this->debuffer = ['ciphertext' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true];
+        //$this->newtag = $this->oldtag = false;
+
+        if ($this->usesNonce()) {
+            if ($this->nonce === false) {
+                throw new InsufficientSetupException('No nonce has been defined');
+            }
+            if ($this->mode == self::MODE_GCM && !in_array($this->engine, [self::ENGINE_LIBSODIUM, self::ENGINE_OPENSSL_GCM])) {
+                $this->setupGCM();
+            }
+        } else {
+            $this->iv = $this->origIV;
+        }
+
+        if ($this->iv === false && !in_array($this->mode, [self::MODE_STREAM, self::MODE_ECB])) {
+            if ($this->mode != self::MODE_GCM || !in_array($this->engine, [self::ENGINE_LIBSODIUM, self::ENGINE_OPENSSL_GCM])) {
+                throw new InsufficientSetupException('No IV has been defined');
+            }
+        }
+
+        if ($this->key === false) {
+            throw new InsufficientSetupException('No key has been defined');
+        }
+
+        $this->encryptIV = $this->decryptIV = $this->iv;
+
+        switch ($this->engine) {
+            case self::ENGINE_MCRYPT:
+                $this->enchanged = $this->dechanged = true;
+
+                set_error_handler(function () {
+                });
+
+                if (!isset($this->enmcrypt)) {
+                    static $mcrypt_modes = [
+                        self::MODE_CTR    => 'ctr',
+                        self::MODE_ECB    => MCRYPT_MODE_ECB,
+                        self::MODE_CBC    => MCRYPT_MODE_CBC,
+                        self::MODE_CFB    => 'ncfb',
+                        self::MODE_CFB8   => MCRYPT_MODE_CFB,
+                        self::MODE_OFB    => MCRYPT_MODE_NOFB,
+                        self::MODE_OFB8   => MCRYPT_MODE_OFB,
+                        self::MODE_STREAM => MCRYPT_MODE_STREAM,
+                    ];
+
+                    $this->demcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+                    $this->enmcrypt = mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+
+                    // we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
+                    // to workaround mcrypt's broken ncfb implementation in buffered mode
+                    // see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
+                    if ($this->mode == self::MODE_CFB) {
+                        $this->ecb = mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
+                    }
+                } // else should mcrypt_generic_deinit be called?
+
+                if ($this->mode == self::MODE_CFB) {
+                    mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
+                }
+
+                restore_error_handler();
+
+                break;
+            case self::ENGINE_INTERNAL:
+                $this->setupKey();
+                break;
+            case self::ENGINE_EVAL:
+                if ($this->nonIVChanged) {
+                    $this->setupKey();
+                    $this->setupInlineCrypt();
+                }
+        }
+
+        $this->nonIVChanged = false;
+    }
+
+    /**
+     * Pads a string
+     *
+     * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
+     * $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to
+     * chr($this->block_size - (strlen($text) % $this->block_size)
+     *
+     * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
+     * and padding will, hence forth, be enabled.
+     *
+     * @see self::unpad()
+     * @param string $text
+     * @throws \LengthException if padding is disabled and the plaintext's length is not a multiple of the block size
+     * @return string
+     */
+    protected function pad($text)
+    {
+        $length = strlen($text);
+
+        if (!$this->padding) {
+            if ($length % $this->block_size == 0) {
+                return $text;
+            } else {
+                throw new \LengthException("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size}). Try enabling padding.");
+            }
+        }
+
+        $pad = $this->block_size - ($length % $this->block_size);
+
+        return str_pad($text, $length + $pad, chr($pad));
+    }
+
+    /**
+     * Unpads a string.
+     *
+     * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
+     * and false will be returned.
+     *
+     * @see self::pad()
+     * @param string $text
+     * @throws \LengthException if the ciphertext's length is not a multiple of the block size
+     * @return string
+     */
+    protected function unpad($text)
+    {
+        if (!$this->padding) {
+            return $text;
+        }
+
+        $length = ord($text[strlen($text) - 1]);
+
+        if (!$length || $length > $this->block_size) {
+            throw new BadDecryptionException("The ciphertext has an invalid padding length ($length) compared to the block size ({$this->block_size})");
+        }
+
+        return substr($text, 0, -$length);
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * Stores the created (or existing) callback function-name
+     * in $this->inline_crypt
+     *
+     * Internally for phpseclib developers:
+     *
+     *     _setupInlineCrypt() would be called only if:
+     *
+     *     - $this->engine === self::ENGINE_EVAL
+     *
+     *     - each time on _setup(), after(!) _setupKey()
+     *
+     *
+     *     This ensures that _setupInlineCrypt() has always a
+     *     full ready2go initializated internal cipher $engine state
+     *     where, for example, the keys already expanded,
+     *     keys/block_size calculated and such.
+     *
+     *     It is, each time if called, the responsibility of _setupInlineCrypt():
+     *
+     *     - to set $this->inline_crypt to a valid and fully working callback function
+     *       as a (faster) replacement for encrypt() / decrypt()
+     *
+     *     - NOT to create unlimited callback functions (for memory reasons!)
+     *       no matter how often _setupInlineCrypt() would be called. At some
+     *       point of amount they must be generic re-useable.
+     *
+     *     - the code of _setupInlineCrypt() it self,
+     *       and the generated callback code,
+     *       must be, in following order:
+     *       - 100% safe
+     *       - 100% compatible to encrypt()/decrypt()
+     *       - using only php5+ features/lang-constructs/php-extensions if
+     *         compatibility (down to php4) or fallback is provided
+     *       - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-)
+     *       - >= 10% faster than encrypt()/decrypt() [which is, by the way,
+     *         the reason for the existence of _setupInlineCrypt() :-)]
+     *       - memory-nice
+     *       - short (as good as possible)
+     *
+     * Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
+     *       - In case of using inline crypting, _setupInlineCrypt() must extend by the child \phpseclib3\Crypt\* class.
+     *       - The following variable names are reserved:
+     *         - $_*  (all variable names prefixed with an underscore)
+     *         - $self (object reference to it self. Do not use $this, but $self instead)
+     *         - $in (the content of $in has to en/decrypt by the generated code)
+     *       - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
+     *
+     * {@internal If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()}
+     *
+     * @see self::setup()
+     * @see self::createInlineCryptFunction()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     */
+    //protected function setupInlineCrypt();
+
+    /**
+     * Creates the performance-optimized function for en/decrypt()
+     *
+     * Internally for phpseclib developers:
+     *
+     *    _createInlineCryptFunction():
+     *
+     *    - merge the $cipher_code [setup'ed by _setupInlineCrypt()]
+     *      with the current [$this->]mode of operation code
+     *
+     *    - create the $inline function, which called by encrypt() / decrypt()
+     *      as its replacement to speed up the en/decryption operations.
+     *
+     *    - return the name of the created $inline callback function
+     *
+     *    - used to speed up en/decryption
+     *
+     *
+     *
+     *    The main reason why can speed up things [up to 50%] this way are:
+     *
+     *    - using variables more effective then regular.
+     *      (ie no use of expensive arrays but integers $k_0, $k_1 ...
+     *      or even, for example, the pure $key[] values hardcoded)
+     *
+     *    - avoiding 1000's of function calls of ie _encryptBlock()
+     *      but inlining the crypt operations.
+     *      in the mode of operation for() loop.
+     *
+     *    - full loop unroll the (sometimes key-dependent) rounds
+     *      avoiding this way ++$i counters and runtime-if's etc...
+     *
+     *    The basic code architectur of the generated $inline en/decrypt()
+     *    lambda function, in pseudo php, is:
+     *
+     *    <code>
+     *    +----------------------------------------------------------------------------------------------+
+     *    | callback $inline = create_function:                                                          |
+     *    | lambda_function_0001_crypt_ECB($action, $text)                                               |
+     *    | {                                                                                            |
+     *    |     INSERT PHP CODE OF:                                                                      |
+     *    |     $cipher_code['init_crypt'];                  // general init code.                       |
+     *    |                                                  // ie: $sbox'es declarations used for       |
+     *    |                                                  //     encrypt and decrypt'ing.             |
+     *    |                                                                                              |
+     *    |     switch ($action) {                                                                       |
+     *    |         case 'encrypt':                                                                      |
+     *    |             INSERT PHP CODE OF:                                                              |
+     *    |             $cipher_code['init_encrypt'];       // encrypt sepcific init code.               |
+     *    |                                                    ie: specified $key or $box                |
+     *    |                                                        declarations for encrypt'ing.         |
+     *    |                                                                                              |
+     *    |             foreach ($ciphertext) {                                                          |
+     *    |                 $in = $block_size of $ciphertext;                                            |
+     *    |                                                                                              |
+     *    |                 INSERT PHP CODE OF:                                                          |
+     *    |                 $cipher_code['encrypt_block'];  // encrypt's (string) $in, which is always:  |
+     *    |                                                 // strlen($in) == $this->block_size          |
+     *    |                                                 // here comes the cipher algorithm in action |
+     *    |                                                 // for encryption.                           |
+     *    |                                                 // $cipher_code['encrypt_block'] has to      |
+     *    |                                                 // encrypt the content of the $in variable   |
+     *    |                                                                                              |
+     *    |                 $plaintext .= $in;                                                           |
+     *    |             }                                                                                |
+     *    |             return $plaintext;                                                               |
+     *    |                                                                                              |
+     *    |         case 'decrypt':                                                                      |
+     *    |             INSERT PHP CODE OF:                                                              |
+     *    |             $cipher_code['init_decrypt'];       // decrypt sepcific init code                |
+     *    |                                                    ie: specified $key or $box                |
+     *    |                                                        declarations for decrypt'ing.         |
+     *    |             foreach ($plaintext) {                                                           |
+     *    |                 $in = $block_size of $plaintext;                                             |
+     *    |                                                                                              |
+     *    |                 INSERT PHP CODE OF:                                                          |
+     *    |                 $cipher_code['decrypt_block'];  // decrypt's (string) $in, which is always   |
+     *    |                                                 // strlen($in) == $this->block_size          |
+     *    |                                                 // here comes the cipher algorithm in action |
+     *    |                                                 // for decryption.                           |
+     *    |                                                 // $cipher_code['decrypt_block'] has to      |
+     *    |                                                 // decrypt the content of the $in variable   |
+     *    |                 $ciphertext .= $in;                                                          |
+     *    |             }                                                                                |
+     *    |             return $ciphertext;                                                              |
+     *    |     }                                                                                        |
+     *    | }                                                                                            |
+     *    +----------------------------------------------------------------------------------------------+
+     *    </code>
+     *
+     *    See also the \phpseclib3\Crypt\*::_setupInlineCrypt()'s for
+     *    productive inline $cipher_code's how they works.
+     *
+     *    Structure of:
+     *    <code>
+     *    $cipher_code = [
+     *        'init_crypt'    => (string) '', // optional
+     *        'init_encrypt'  => (string) '', // optional
+     *        'init_decrypt'  => (string) '', // optional
+     *        'encrypt_block' => (string) '', // required
+     *        'decrypt_block' => (string) ''  // required
+     *    ];
+     *    </code>
+     *
+     * @see self::setupInlineCrypt()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param array $cipher_code
+     * @return string (the name of the created callback function)
+     */
+    protected function createInlineCryptFunction($cipher_code)
+    {
+        $block_size = $this->block_size;
+
+        // optional
+        $init_crypt    = isset($cipher_code['init_crypt'])    ? $cipher_code['init_crypt']    : '';
+        $init_encrypt  = isset($cipher_code['init_encrypt'])  ? $cipher_code['init_encrypt']  : '';
+        $init_decrypt  = isset($cipher_code['init_decrypt'])  ? $cipher_code['init_decrypt']  : '';
+        // required
+        $encrypt_block = $cipher_code['encrypt_block'];
+        $decrypt_block = $cipher_code['decrypt_block'];
+
+        // Generating mode of operation inline code,
+        // merged with the $cipher_code algorithm
+        // for encrypt- and decryption.
+        switch ($this->mode) {
+            case self::MODE_ECB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+
+                    for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                        $in = substr($_text, $_i, ' . $block_size . ');
+                        ' . $encrypt_block . '
+                        $_ciphertext.= $in;
+                    }
+
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    $_text = str_pad($_text, strlen($_text) + (' . $block_size . ' - strlen($_text) % ' . $block_size . ') % ' . $block_size . ', chr(0));
+                    $_ciphertext_len = strlen($_text);
+
+                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                        $in = substr($_text, $_i, ' . $block_size . ');
+                        ' . $decrypt_block . '
+                        $_plaintext.= $in;
+                    }
+
+                    return $this->unpad($_plaintext);
+                    ';
+                break;
+            case self::MODE_CTR:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+                    $_xor = $this->encryptIV;
+                    $_buffer = &$this->enbuffer;
+                    if (strlen($_buffer["ciphertext"])) {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
+                                $in = $_xor;
+                                ' . $encrypt_block . '
+                                \phpseclib3\Common\Functions\Strings::increment_str($_xor);
+                                $_buffer["ciphertext"].= $in;
+                            }
+                            $_key = \phpseclib3\Common\Functions\Strings::shift($_buffer["ciphertext"], ' . $block_size . ');
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            $in = $_xor;
+                            ' . $encrypt_block . '
+                            \phpseclib3\Common\Functions\Strings::increment_str($_xor);
+                            $_key = $in;
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    }
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = $_xor;
+                        if ($_start = $_plaintext_len % ' . $block_size . ') {
+                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
+                        }
+                    }
+
+                    return $_ciphertext;
+                ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_ciphertext_len = strlen($_text);
+                    $_xor = $this->decryptIV;
+                    $_buffer = &$this->debuffer;
+
+                    if (strlen($_buffer["ciphertext"])) {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
+                                $in = $_xor;
+                                ' . $encrypt_block . '
+                                \phpseclib3\Common\Functions\Strings::increment_str($_xor);
+                                $_buffer["ciphertext"].= $in;
+                            }
+                            $_key = \phpseclib3\Common\Functions\Strings::shift($_buffer["ciphertext"], ' . $block_size . ');
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            $in = $_xor;
+                            ' . $encrypt_block . '
+                            \phpseclib3\Common\Functions\Strings::increment_str($_xor);
+                            $_key = $in;
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    }
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = $_xor;
+                        if ($_start = $_ciphertext_len % ' . $block_size . ') {
+                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
+                        }
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case self::MODE_CFB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_buffer = &$this->enbuffer;
+
+                    if ($this->continuousBuffer) {
+                        $_iv = &$this->encryptIV;
+                        $_pos = &$_buffer["pos"];
+                    } else {
+                        $_iv = $this->encryptIV;
+                        $_pos = 0;
+                    }
+                    $_len = strlen($_text);
+                    $_i = 0;
+                    if ($_pos) {
+                        $_orig_pos = $_pos;
+                        $_max = ' . $block_size . ' - $_pos;
+                        if ($_len >= $_max) {
+                            $_i = $_max;
+                            $_len-= $_max;
+                            $_pos = 0;
+                        } else {
+                            $_i = $_len;
+                            $_pos+= $_len;
+                            $_len = 0;
+                        }
+                        $_ciphertext = substr($_iv, $_orig_pos) ^ $_text;
+                        $_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i);
+                    }
+                    while ($_len >= ' . $block_size . ') {
+                        $in = $_iv;
+                        ' . $encrypt_block . ';
+                        $_iv = $in ^ substr($_text, $_i, ' . $block_size . ');
+                        $_ciphertext.= $_iv;
+                        $_len-= ' . $block_size . ';
+                        $_i+= ' . $block_size . ';
+                    }
+                    if ($_len) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_iv = $in;
+                        $_block = $_iv ^ substr($_text, $_i);
+                        $_iv = substr_replace($_iv, $_block, 0, $_len);
+                        $_ciphertext.= $_block;
+                        $_pos = $_len;
+                    }
+                    return $_ciphertext;
+                ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_buffer = &$this->debuffer;
+
+                    if ($this->continuousBuffer) {
+                        $_iv = &$this->decryptIV;
+                        $_pos = &$_buffer["pos"];
+                    } else {
+                        $_iv = $this->decryptIV;
+                        $_pos = 0;
+                    }
+                    $_len = strlen($_text);
+                    $_i = 0;
+                    if ($_pos) {
+                        $_orig_pos = $_pos;
+                        $_max = ' . $block_size . ' - $_pos;
+                        if ($_len >= $_max) {
+                            $_i = $_max;
+                            $_len-= $_max;
+                            $_pos = 0;
+                        } else {
+                            $_i = $_len;
+                            $_pos+= $_len;
+                            $_len = 0;
+                        }
+                        $_plaintext = substr($_iv, $_orig_pos) ^ $_text;
+                        $_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i);
+                    }
+                    while ($_len >= ' . $block_size . ') {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_iv = $in;
+                        $cb = substr($_text, $_i, ' . $block_size . ');
+                        $_plaintext.= $_iv ^ $cb;
+                        $_iv = $cb;
+                        $_len-= ' . $block_size . ';
+                        $_i+= ' . $block_size . ';
+                    }
+                    if ($_len) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_iv = $in;
+                        $_plaintext.= $_iv ^ substr($_text, $_i);
+                        $_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len);
+                        $_pos = $_len;
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case self::MODE_CFB8:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_len = strlen($_text);
+                    $_iv = $this->encryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_ciphertext .= ($_c = $_text[$_i] ^ $in);
+                        $_iv = substr($_iv, 1) . $_c;
+                    }
+
+                    if ($this->continuousBuffer) {
+                        if ($_len >= ' . $block_size . ') {
+                            $this->encryptIV = substr($_ciphertext, -' . $block_size . ');
+                        } else {
+                            $this->encryptIV = substr($this->encryptIV, $_len - ' . $block_size . ') . substr($_ciphertext, -$_len);
+                        }
+                    }
+
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_len = strlen($_text);
+                    $_iv = $this->decryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_plaintext .= $_text[$_i] ^ $in;
+                        $_iv = substr($_iv, 1) . $_text[$_i];
+                    }
+
+                    if ($this->continuousBuffer) {
+                        if ($_len >= ' . $block_size . ') {
+                            $this->decryptIV = substr($_text, -' . $block_size . ');
+                        } else {
+                            $this->decryptIV = substr($this->decryptIV, $_len - ' . $block_size . ') . substr($_text, -$_len);
+                        }
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case self::MODE_OFB8:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_len = strlen($_text);
+                    $_iv = $this->encryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_ciphertext.= $_text[$_i] ^ $in;
+                        $_iv = substr($_iv, 1) . $in[0];
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = $_iv;
+                    }
+
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_len = strlen($_text);
+                    $_iv = $this->decryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        ' . $encrypt_block . '
+                        $_plaintext.= $_text[$_i] ^ $in;
+                        $_iv = substr($_iv, 1) . $in[0];
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = $_iv;
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case self::MODE_OFB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+                    $_xor = $this->encryptIV;
+                    $_buffer = &$this->enbuffer;
+
+                    if (strlen($_buffer["xor"])) {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            if (strlen($_block) > strlen($_buffer["xor"])) {
+                                $in = $_xor;
+                                ' . $encrypt_block . '
+                                $_xor = $in;
+                                $_buffer["xor"].= $_xor;
+                            }
+                            $_key = \phpseclib3\Common\Functions\Strings::shift($_buffer["xor"], ' . $block_size . ');
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                            $in = $_xor;
+                            ' . $encrypt_block . '
+                            $_xor = $in;
+                            $_ciphertext.= substr($_text, $_i, ' . $block_size . ') ^ $_xor;
+                        }
+                        $_key = $_xor;
+                    }
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = $_xor;
+                        if ($_start = $_plaintext_len % ' . $block_size . ') {
+                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
+                        }
+                    }
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_ciphertext_len = strlen($_text);
+                    $_xor = $this->decryptIV;
+                    $_buffer = &$this->debuffer;
+
+                    if (strlen($_buffer["xor"])) {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                            $_block = substr($_text, $_i, ' . $block_size . ');
+                            if (strlen($_block) > strlen($_buffer["xor"])) {
+                                $in = $_xor;
+                                ' . $encrypt_block . '
+                                $_xor = $in;
+                                $_buffer["xor"].= $_xor;
+                            }
+                            $_key = \phpseclib3\Common\Functions\Strings::shift($_buffer["xor"], ' . $block_size . ');
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                            $in = $_xor;
+                            ' . $encrypt_block . '
+                            $_xor = $in;
+                            $_plaintext.= substr($_text, $_i, ' . $block_size . ') ^ $_xor;
+                        }
+                        $_key = $_xor;
+                    }
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = $_xor;
+                        if ($_start = $_ciphertext_len % ' . $block_size . ') {
+                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
+                        }
+                    }
+                    return $_plaintext;
+                    ';
+                break;
+            case self::MODE_STREAM:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    ' . $encrypt_block . '
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    ' . $decrypt_block . '
+                    return $_plaintext;
+                    ';
+                break;
+            // case self::MODE_CBC:
+            default:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+
+                    $in = $this->encryptIV;
+
+                    for ($_i = 0; $_i < $_plaintext_len; $_i+= ' . $block_size . ') {
+                        $in = substr($_text, $_i, ' . $block_size . ') ^ $in;
+                        ' . $encrypt_block . '
+                        $_ciphertext.= $in;
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = $in;
+                    }
+
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    $_text = str_pad($_text, strlen($_text) + (' . $block_size . ' - strlen($_text) % ' . $block_size . ') % ' . $block_size . ', chr(0));
+                    $_ciphertext_len = strlen($_text);
+
+                    $_iv = $this->decryptIV;
+
+                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= ' . $block_size . ') {
+                        $in = $_block = substr($_text, $_i, ' . $block_size . ');
+                        ' . $decrypt_block . '
+                        $_plaintext.= $in ^ $_iv;
+                        $_iv = $_block;
+                    }
+
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = $_iv;
+                    }
+
+                    return $this->unpad($_plaintext);
+                    ';
+                break;
+        }
+
+        // Before discrediting this, please read the following:
+        // @see https://github.com/phpseclib/phpseclib/issues/1293
+        // @see https://github.com/phpseclib/phpseclib/pull/1143
+        eval('$func = function ($_action, $_text) { ' . $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }};');
+
+        return \Closure::bind($func, $this, static::class);
+    }
+
+    /**
+     * Convert float to int
+     *
+     * On ARM CPUs converting floats to ints doesn't always work
+     *
+     * @param string $x
+     * @return int
+     */
+    protected static function safe_intval($x)
+    {
+        if (is_int($x)) {
+            return $x;
+        }
+
+        if (self::$use_reg_intval) {
+            return PHP_INT_SIZE == 4 && PHP_VERSION_ID >= 80100 ? intval($x) : $x;
+        }
+
+        return (fmod($x, 0x80000000) & 0x7FFFFFFF) |
+            ((fmod(floor($x / 0x80000000), 2) & 1) << 31);
+    }
+
+    /**
+     * eval()'able string for in-line float to int
+     *
+     * @return string
+     */
+    protected static function safe_intval_inline()
+    {
+        if (self::$use_reg_intval) {
+            return PHP_INT_SIZE == 4 && PHP_VERSION_ID >= 80100 ? 'intval(%s)' : '%s';
+        }
+
+        $safeint = '(is_int($temp = %s) ? $temp : (fmod($temp, 0x80000000) & 0x7FFFFFFF) | ';
+        return $safeint . '((fmod(floor($temp / 0x80000000), 2) & 1) << 31))';
+    }
+
+    /**
+     * Sets up GCM parameters
+     *
+     * See steps 1-2 of https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf#page=23
+     * for more info
+     *
+     */
+    private function setupGCM()
+    {
+        // don't keep on re-calculating $this->h
+        if (!$this->h || $this->hKey != $this->key) {
+            $cipher = new static('ecb');
+            $cipher->setKey($this->key);
+            $cipher->disablePadding();
+
+            $this->h = self::$gcmField->newInteger(
+                Strings::switchEndianness($cipher->encrypt("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"))
+            );
+            $this->hKey = $this->key;
+        }
+
+        if (strlen($this->nonce) == 12) {
+            $this->iv = $this->nonce . "\0\0\0\1";
+        } else {
+            $this->iv = $this->ghash(
+                self::nullPad128($this->nonce) . str_repeat("\0", 8) . self::len64($this->nonce)
+            );
+        }
+    }
+
+    /**
+     * Performs GHASH operation
+     *
+     * See https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf#page=20
+     * for more info
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @param string $x
+     * @return string
+     */
+    private function ghash($x)
+    {
+        $h = $this->h;
+        $y = ["\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"];
+        $x = str_split($x, 16);
+        $n = 0;
+        // the switchEndianness calls are necessary because the multiplication algorithm in BinaryField/Integer
+        // interprets strings as polynomials in big endian order whereas in GCM they're interpreted in little
+        // endian order per https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf#page=19.
+        // big endian order is what binary field elliptic curves use per http://www.secg.org/sec1-v2.pdf#page=18.
+
+        // we could switchEndianness here instead of in the while loop but doing so in the while loop seems like it
+        // might be slightly more performant
+        //$x = Strings::switchEndianness($x);
+        foreach ($x as $xn) {
+            $xn = Strings::switchEndianness($xn);
+            $t = $y[$n] ^ $xn;
+            $temp = self::$gcmField->newInteger($t);
+            $y[++$n] = $temp->multiply($h)->toBytes();
+            $y[$n] = substr($y[$n], 1);
+        }
+        $y[$n] = Strings::switchEndianness($y[$n]);
+        return $y[$n];
+    }
+
+    /**
+     * Returns the bit length of a string in a packed format
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @see self::setupGCM()
+     * @param string $str
+     * @return string
+     */
+    private static function len64($str)
+    {
+        return "\0\0\0\0" . pack('N', 8 * strlen($str));
+    }
+
+    /**
+     * NULL pads a string to be a multiple of 128
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @see self::setupGCM()
+     * @param string $str
+     * @return string
+     */
+    protected static function nullPad128($str)
+    {
+        $len = strlen($str);
+        return $str . str_repeat("\0", 16 * ceil($len / 16) - $len);
+    }
+
+    /**
+     * Calculates Poly1305 MAC
+     *
+     * On my system ChaCha20, with libsodium, takes 0.5s. With this custom Poly1305 implementation
+     * it takes 1.2s.
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @param string $text
+     * @return string
+     */
+    protected function poly1305($text)
+    {
+        $s = $this->poly1305Key; // strlen($this->poly1305Key) == 32
+        $r = Strings::shift($s, 16);
+        $r = strrev($r);
+        $r &= "\x0f\xff\xff\xfc\x0f\xff\xff\xfc\x0f\xff\xff\xfc\x0f\xff\xff\xff";
+        $s = strrev($s);
+
+        $r = self::$poly1305Field->newInteger(new BigInteger($r, 256));
+        $s = self::$poly1305Field->newInteger(new BigInteger($s, 256));
+        $a = self::$poly1305Field->newInteger(new BigInteger());
+
+        $blocks = str_split($text, 16);
+        foreach ($blocks as $block) {
+            $n = strrev($block . chr(1));
+            $n = self::$poly1305Field->newInteger(new BigInteger($n, 256));
+            $a = $a->add($n);
+            $a = $a->multiply($r);
+        }
+        $r = $a->toBigInteger()->add($s->toBigInteger());
+        $mask = "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF";
+        return strrev($r->toBytes()) & $mask;
+    }
+
+    /**
+     * Return the mode
+     *
+     * You can do $obj instanceof AES or whatever to get the cipher but you can't do that to get the mode
+     *
+     * @return string
+     */
+    public function getMode()
+    {
+        return array_flip(self::MODE_MAP)[$this->mode];
+    }
+
+    /**
+     * Is the continuous buffer enabled?
+     *
+     * @return boolean
+     */
+    public function continuousBufferEnabled()
+    {
+        return $this->continuousBuffer;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/Fingerprint.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/Fingerprint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/Fingerprint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * Fingerprint Trait for Public Keys
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Traits;
+
+use phpseclib3\Crypt\Hash;
+
+/**
+ * Fingerprint Trait for Private Keys
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+trait Fingerprint
+{
+    /**
+     * Returns the public key's fingerprint
+     *
+     * The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
+     * no public key currently loaded, false is returned.
+     * Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
+     *
+     * @param string $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
+     * for invalid values.
+     * @return mixed
+     */
+    public function getFingerprint($algorithm = 'md5')
+    {
+        $type = self::validatePlugin('Keys', 'OpenSSH', 'savePublicKey');
+        if ($type === false) {
+            return false;
+        }
+        $key = $this->toString('OpenSSH', ['binary' => true]);
+        if ($key === false) {
+            return false;
+        }
+        switch ($algorithm) {
+            case 'sha256':
+                $hash = new Hash('sha256');
+                $base = base64_encode($hash->hash($key));
+                return substr($base, 0, strlen($base) - 1);
+            case 'md5':
+                return substr(chunk_split(md5($key), 2, ':'), 0, -1);
+            default:
+                return false;
+        }
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/PasswordProtected.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/PasswordProtected.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Common/Traits/PasswordProtected.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * Password Protected Trait for Private Keys
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\Common\Traits;
+
+/**
+ * Password Protected Trait for Private Keys
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+trait PasswordProtected
+{
+    /**
+     * Password
+     *
+     * @var string|bool
+     */
+    private $password = false;
+
+    /**
+     * Sets the password
+     *
+     * Private keys can be encrypted with a password.  To unset the password, pass in the empty string or false.
+     * Or rather, pass in $password such that empty($password) && !is_string($password) is true.
+     *
+     * @see self::createKey()
+     * @see self::load()
+     * @param string|bool $password
+     */
+    public function withPassword($password = false)
+    {
+        $new = clone $this;
+        $new->password = $password;
+        return $new;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DES.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1392 @@
+<?php
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/DES_supplementary_material Wikipedia: DES supplementary material}
+ *  - {@link http://www.itl.nist.gov/fipspubs/fip46-2.htm FIPS 46-2 - (DES), Data Encryption Standard}
+ *  - {@link http://www.cs.eku.edu/faculty/styer/460/Encrypt/JS-DES.html JavaScript DES Example}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $des = new \phpseclib3\Crypt\DES('ctr');
+ *
+ *    $des->setKey('abcdefgh');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $des->decrypt($des->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\BlockCipher;
+use phpseclib3\Exception\BadModeException;
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class DES extends BlockCipher
+{
+    /**
+     * Contains $keys[self::ENCRYPT]
+     *
+     * @see \phpseclib3\Crypt\DES::setupKey()
+     * @see \phpseclib3\Crypt\DES::processBlock()
+     */
+    const ENCRYPT = 0;
+    /**
+     * Contains $keys[self::DECRYPT]
+     *
+     * @see \phpseclib3\Crypt\DES::setupKey()
+     * @see \phpseclib3\Crypt\DES::processBlock()
+     */
+    const DECRYPT = 1;
+
+    /**
+     * Block Length of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
+     * @var int
+     */
+    protected $block_size = 8;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 8;
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'des';
+
+    /**
+     * The OpenSSL names of the cipher / modes
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::openssl_mode_names
+     * @var array
+     */
+    protected $openssl_mode_names = [
+        self::MODE_ECB => 'des-ecb',
+        self::MODE_CBC => 'des-cbc',
+        self::MODE_CFB => 'des-cfb',
+        self::MODE_OFB => 'des-ofb'
+        // self::MODE_CTR is undefined for DES
+    ];
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len
+     * @var int
+     */
+    protected $cfb_init_len = 500;
+
+    /**
+     * Switch for DES/3DES encryption
+     *
+     * Used only if $engine == self::ENGINE_INTERNAL
+     *
+     * @see self::setupKey()
+     * @see self::processBlock()
+     * @var int
+     */
+    protected $des_rounds = 1;
+
+    /**
+     * max possible size of $key
+     *
+     * @see self::setKey()
+     * @var string
+     */
+    protected $key_length_max = 8;
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::setupKey()
+     * @var array
+     */
+    private $keys;
+
+    /**
+     * Key Cache "key"
+     *
+     * @see self::setupKey()
+     * @var array
+     */
+    private $kl;
+
+    /**
+     * Shuffle table.
+     *
+     * For each byte value index, the entry holds an 8-byte string
+     * with each byte containing all bits in the same state as the
+     * corresponding bit in the index value.
+     *
+     * @see self::processBlock()
+     * @see self::setupKey()
+     * @var array
+     */
+    protected static $shuffle = [
+        "\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\xFF",
+        "\x00\x00\x00\x00\x00\x00\xFF\x00", "\x00\x00\x00\x00\x00\x00\xFF\xFF",
+        "\x00\x00\x00\x00\x00\xFF\x00\x00", "\x00\x00\x00\x00\x00\xFF\x00\xFF",
+        "\x00\x00\x00\x00\x00\xFF\xFF\x00", "\x00\x00\x00\x00\x00\xFF\xFF\xFF",
+        "\x00\x00\x00\x00\xFF\x00\x00\x00", "\x00\x00\x00\x00\xFF\x00\x00\xFF",
+        "\x00\x00\x00\x00\xFF\x00\xFF\x00", "\x00\x00\x00\x00\xFF\x00\xFF\xFF",
+        "\x00\x00\x00\x00\xFF\xFF\x00\x00", "\x00\x00\x00\x00\xFF\xFF\x00\xFF",
+        "\x00\x00\x00\x00\xFF\xFF\xFF\x00", "\x00\x00\x00\x00\xFF\xFF\xFF\xFF",
+        "\x00\x00\x00\xFF\x00\x00\x00\x00", "\x00\x00\x00\xFF\x00\x00\x00\xFF",
+        "\x00\x00\x00\xFF\x00\x00\xFF\x00", "\x00\x00\x00\xFF\x00\x00\xFF\xFF",
+        "\x00\x00\x00\xFF\x00\xFF\x00\x00", "\x00\x00\x00\xFF\x00\xFF\x00\xFF",
+        "\x00\x00\x00\xFF\x00\xFF\xFF\x00", "\x00\x00\x00\xFF\x00\xFF\xFF\xFF",
+        "\x00\x00\x00\xFF\xFF\x00\x00\x00", "\x00\x00\x00\xFF\xFF\x00\x00\xFF",
+        "\x00\x00\x00\xFF\xFF\x00\xFF\x00", "\x00\x00\x00\xFF\xFF\x00\xFF\xFF",
+        "\x00\x00\x00\xFF\xFF\xFF\x00\x00", "\x00\x00\x00\xFF\xFF\xFF\x00\xFF",
+        "\x00\x00\x00\xFF\xFF\xFF\xFF\x00", "\x00\x00\x00\xFF\xFF\xFF\xFF\xFF",
+        "\x00\x00\xFF\x00\x00\x00\x00\x00", "\x00\x00\xFF\x00\x00\x00\x00\xFF",
+        "\x00\x00\xFF\x00\x00\x00\xFF\x00", "\x00\x00\xFF\x00\x00\x00\xFF\xFF",
+        "\x00\x00\xFF\x00\x00\xFF\x00\x00", "\x00\x00\xFF\x00\x00\xFF\x00\xFF",
+        "\x00\x00\xFF\x00\x00\xFF\xFF\x00", "\x00\x00\xFF\x00\x00\xFF\xFF\xFF",
+        "\x00\x00\xFF\x00\xFF\x00\x00\x00", "\x00\x00\xFF\x00\xFF\x00\x00\xFF",
+        "\x00\x00\xFF\x00\xFF\x00\xFF\x00", "\x00\x00\xFF\x00\xFF\x00\xFF\xFF",
+        "\x00\x00\xFF\x00\xFF\xFF\x00\x00", "\x00\x00\xFF\x00\xFF\xFF\x00\xFF",
+        "\x00\x00\xFF\x00\xFF\xFF\xFF\x00", "\x00\x00\xFF\x00\xFF\xFF\xFF\xFF",
+        "\x00\x00\xFF\xFF\x00\x00\x00\x00", "\x00\x00\xFF\xFF\x00\x00\x00\xFF",
+        "\x00\x00\xFF\xFF\x00\x00\xFF\x00", "\x00\x00\xFF\xFF\x00\x00\xFF\xFF",
+        "\x00\x00\xFF\xFF\x00\xFF\x00\x00", "\x00\x00\xFF\xFF\x00\xFF\x00\xFF",
+        "\x00\x00\xFF\xFF\x00\xFF\xFF\x00", "\x00\x00\xFF\xFF\x00\xFF\xFF\xFF",
+        "\x00\x00\xFF\xFF\xFF\x00\x00\x00", "\x00\x00\xFF\xFF\xFF\x00\x00\xFF",
+        "\x00\x00\xFF\xFF\xFF\x00\xFF\x00", "\x00\x00\xFF\xFF\xFF\x00\xFF\xFF",
+        "\x00\x00\xFF\xFF\xFF\xFF\x00\x00", "\x00\x00\xFF\xFF\xFF\xFF\x00\xFF",
+        "\x00\x00\xFF\xFF\xFF\xFF\xFF\x00", "\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\x00\xFF\x00\x00\x00\x00\x00\x00", "\x00\xFF\x00\x00\x00\x00\x00\xFF",
+        "\x00\xFF\x00\x00\x00\x00\xFF\x00", "\x00\xFF\x00\x00\x00\x00\xFF\xFF",
+        "\x00\xFF\x00\x00\x00\xFF\x00\x00", "\x00\xFF\x00\x00\x00\xFF\x00\xFF",
+        "\x00\xFF\x00\x00\x00\xFF\xFF\x00", "\x00\xFF\x00\x00\x00\xFF\xFF\xFF",
+        "\x00\xFF\x00\x00\xFF\x00\x00\x00", "\x00\xFF\x00\x00\xFF\x00\x00\xFF",
+        "\x00\xFF\x00\x00\xFF\x00\xFF\x00", "\x00\xFF\x00\x00\xFF\x00\xFF\xFF",
+        "\x00\xFF\x00\x00\xFF\xFF\x00\x00", "\x00\xFF\x00\x00\xFF\xFF\x00\xFF",
+        "\x00\xFF\x00\x00\xFF\xFF\xFF\x00", "\x00\xFF\x00\x00\xFF\xFF\xFF\xFF",
+        "\x00\xFF\x00\xFF\x00\x00\x00\x00", "\x00\xFF\x00\xFF\x00\x00\x00\xFF",
+        "\x00\xFF\x00\xFF\x00\x00\xFF\x00", "\x00\xFF\x00\xFF\x00\x00\xFF\xFF",
+        "\x00\xFF\x00\xFF\x00\xFF\x00\x00", "\x00\xFF\x00\xFF\x00\xFF\x00\xFF",
+        "\x00\xFF\x00\xFF\x00\xFF\xFF\x00", "\x00\xFF\x00\xFF\x00\xFF\xFF\xFF",
+        "\x00\xFF\x00\xFF\xFF\x00\x00\x00", "\x00\xFF\x00\xFF\xFF\x00\x00\xFF",
+        "\x00\xFF\x00\xFF\xFF\x00\xFF\x00", "\x00\xFF\x00\xFF\xFF\x00\xFF\xFF",
+        "\x00\xFF\x00\xFF\xFF\xFF\x00\x00", "\x00\xFF\x00\xFF\xFF\xFF\x00\xFF",
+        "\x00\xFF\x00\xFF\xFF\xFF\xFF\x00", "\x00\xFF\x00\xFF\xFF\xFF\xFF\xFF",
+        "\x00\xFF\xFF\x00\x00\x00\x00\x00", "\x00\xFF\xFF\x00\x00\x00\x00\xFF",
+        "\x00\xFF\xFF\x00\x00\x00\xFF\x00", "\x00\xFF\xFF\x00\x00\x00\xFF\xFF",
+        "\x00\xFF\xFF\x00\x00\xFF\x00\x00", "\x00\xFF\xFF\x00\x00\xFF\x00\xFF",
+        "\x00\xFF\xFF\x00\x00\xFF\xFF\x00", "\x00\xFF\xFF\x00\x00\xFF\xFF\xFF",
+        "\x00\xFF\xFF\x00\xFF\x00\x00\x00", "\x00\xFF\xFF\x00\xFF\x00\x00\xFF",
+        "\x00\xFF\xFF\x00\xFF\x00\xFF\x00", "\x00\xFF\xFF\x00\xFF\x00\xFF\xFF",
+        "\x00\xFF\xFF\x00\xFF\xFF\x00\x00", "\x00\xFF\xFF\x00\xFF\xFF\x00\xFF",
+        "\x00\xFF\xFF\x00\xFF\xFF\xFF\x00", "\x00\xFF\xFF\x00\xFF\xFF\xFF\xFF",
+        "\x00\xFF\xFF\xFF\x00\x00\x00\x00", "\x00\xFF\xFF\xFF\x00\x00\x00\xFF",
+        "\x00\xFF\xFF\xFF\x00\x00\xFF\x00", "\x00\xFF\xFF\xFF\x00\x00\xFF\xFF",
+        "\x00\xFF\xFF\xFF\x00\xFF\x00\x00", "\x00\xFF\xFF\xFF\x00\xFF\x00\xFF",
+        "\x00\xFF\xFF\xFF\x00\xFF\xFF\x00", "\x00\xFF\xFF\xFF\x00\xFF\xFF\xFF",
+        "\x00\xFF\xFF\xFF\xFF\x00\x00\x00", "\x00\xFF\xFF\xFF\xFF\x00\x00\xFF",
+        "\x00\xFF\xFF\xFF\xFF\x00\xFF\x00", "\x00\xFF\xFF\xFF\xFF\x00\xFF\xFF",
+        "\x00\xFF\xFF\xFF\xFF\xFF\x00\x00", "\x00\xFF\xFF\xFF\xFF\xFF\x00\xFF",
+        "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\x00\x00\x00\x00\x00\x00\x00", "\xFF\x00\x00\x00\x00\x00\x00\xFF",
+        "\xFF\x00\x00\x00\x00\x00\xFF\x00", "\xFF\x00\x00\x00\x00\x00\xFF\xFF",
+        "\xFF\x00\x00\x00\x00\xFF\x00\x00", "\xFF\x00\x00\x00\x00\xFF\x00\xFF",
+        "\xFF\x00\x00\x00\x00\xFF\xFF\x00", "\xFF\x00\x00\x00\x00\xFF\xFF\xFF",
+        "\xFF\x00\x00\x00\xFF\x00\x00\x00", "\xFF\x00\x00\x00\xFF\x00\x00\xFF",
+        "\xFF\x00\x00\x00\xFF\x00\xFF\x00", "\xFF\x00\x00\x00\xFF\x00\xFF\xFF",
+        "\xFF\x00\x00\x00\xFF\xFF\x00\x00", "\xFF\x00\x00\x00\xFF\xFF\x00\xFF",
+        "\xFF\x00\x00\x00\xFF\xFF\xFF\x00", "\xFF\x00\x00\x00\xFF\xFF\xFF\xFF",
+        "\xFF\x00\x00\xFF\x00\x00\x00\x00", "\xFF\x00\x00\xFF\x00\x00\x00\xFF",
+        "\xFF\x00\x00\xFF\x00\x00\xFF\x00", "\xFF\x00\x00\xFF\x00\x00\xFF\xFF",
+        "\xFF\x00\x00\xFF\x00\xFF\x00\x00", "\xFF\x00\x00\xFF\x00\xFF\x00\xFF",
+        "\xFF\x00\x00\xFF\x00\xFF\xFF\x00", "\xFF\x00\x00\xFF\x00\xFF\xFF\xFF",
+        "\xFF\x00\x00\xFF\xFF\x00\x00\x00", "\xFF\x00\x00\xFF\xFF\x00\x00\xFF",
+        "\xFF\x00\x00\xFF\xFF\x00\xFF\x00", "\xFF\x00\x00\xFF\xFF\x00\xFF\xFF",
+        "\xFF\x00\x00\xFF\xFF\xFF\x00\x00", "\xFF\x00\x00\xFF\xFF\xFF\x00\xFF",
+        "\xFF\x00\x00\xFF\xFF\xFF\xFF\x00", "\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\x00\xFF\x00\x00\x00\x00\x00", "\xFF\x00\xFF\x00\x00\x00\x00\xFF",
+        "\xFF\x00\xFF\x00\x00\x00\xFF\x00", "\xFF\x00\xFF\x00\x00\x00\xFF\xFF",
+        "\xFF\x00\xFF\x00\x00\xFF\x00\x00", "\xFF\x00\xFF\x00\x00\xFF\x00\xFF",
+        "\xFF\x00\xFF\x00\x00\xFF\xFF\x00", "\xFF\x00\xFF\x00\x00\xFF\xFF\xFF",
+        "\xFF\x00\xFF\x00\xFF\x00\x00\x00", "\xFF\x00\xFF\x00\xFF\x00\x00\xFF",
+        "\xFF\x00\xFF\x00\xFF\x00\xFF\x00", "\xFF\x00\xFF\x00\xFF\x00\xFF\xFF",
+        "\xFF\x00\xFF\x00\xFF\xFF\x00\x00", "\xFF\x00\xFF\x00\xFF\xFF\x00\xFF",
+        "\xFF\x00\xFF\x00\xFF\xFF\xFF\x00", "\xFF\x00\xFF\x00\xFF\xFF\xFF\xFF",
+        "\xFF\x00\xFF\xFF\x00\x00\x00\x00", "\xFF\x00\xFF\xFF\x00\x00\x00\xFF",
+        "\xFF\x00\xFF\xFF\x00\x00\xFF\x00", "\xFF\x00\xFF\xFF\x00\x00\xFF\xFF",
+        "\xFF\x00\xFF\xFF\x00\xFF\x00\x00", "\xFF\x00\xFF\xFF\x00\xFF\x00\xFF",
+        "\xFF\x00\xFF\xFF\x00\xFF\xFF\x00", "\xFF\x00\xFF\xFF\x00\xFF\xFF\xFF",
+        "\xFF\x00\xFF\xFF\xFF\x00\x00\x00", "\xFF\x00\xFF\xFF\xFF\x00\x00\xFF",
+        "\xFF\x00\xFF\xFF\xFF\x00\xFF\x00", "\xFF\x00\xFF\xFF\xFF\x00\xFF\xFF",
+        "\xFF\x00\xFF\xFF\xFF\xFF\x00\x00", "\xFF\x00\xFF\xFF\xFF\xFF\x00\xFF",
+        "\xFF\x00\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\x00\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\x00\x00\x00\x00\x00\x00", "\xFF\xFF\x00\x00\x00\x00\x00\xFF",
+        "\xFF\xFF\x00\x00\x00\x00\xFF\x00", "\xFF\xFF\x00\x00\x00\x00\xFF\xFF",
+        "\xFF\xFF\x00\x00\x00\xFF\x00\x00", "\xFF\xFF\x00\x00\x00\xFF\x00\xFF",
+        "\xFF\xFF\x00\x00\x00\xFF\xFF\x00", "\xFF\xFF\x00\x00\x00\xFF\xFF\xFF",
+        "\xFF\xFF\x00\x00\xFF\x00\x00\x00", "\xFF\xFF\x00\x00\xFF\x00\x00\xFF",
+        "\xFF\xFF\x00\x00\xFF\x00\xFF\x00", "\xFF\xFF\x00\x00\xFF\x00\xFF\xFF",
+        "\xFF\xFF\x00\x00\xFF\xFF\x00\x00", "\xFF\xFF\x00\x00\xFF\xFF\x00\xFF",
+        "\xFF\xFF\x00\x00\xFF\xFF\xFF\x00", "\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\x00\xFF\x00\x00\x00\x00", "\xFF\xFF\x00\xFF\x00\x00\x00\xFF",
+        "\xFF\xFF\x00\xFF\x00\x00\xFF\x00", "\xFF\xFF\x00\xFF\x00\x00\xFF\xFF",
+        "\xFF\xFF\x00\xFF\x00\xFF\x00\x00", "\xFF\xFF\x00\xFF\x00\xFF\x00\xFF",
+        "\xFF\xFF\x00\xFF\x00\xFF\xFF\x00", "\xFF\xFF\x00\xFF\x00\xFF\xFF\xFF",
+        "\xFF\xFF\x00\xFF\xFF\x00\x00\x00", "\xFF\xFF\x00\xFF\xFF\x00\x00\xFF",
+        "\xFF\xFF\x00\xFF\xFF\x00\xFF\x00", "\xFF\xFF\x00\xFF\xFF\x00\xFF\xFF",
+        "\xFF\xFF\x00\xFF\xFF\xFF\x00\x00", "\xFF\xFF\x00\xFF\xFF\xFF\x00\xFF",
+        "\xFF\xFF\x00\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\x00\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\x00\x00\x00\x00\x00", "\xFF\xFF\xFF\x00\x00\x00\x00\xFF",
+        "\xFF\xFF\xFF\x00\x00\x00\xFF\x00", "\xFF\xFF\xFF\x00\x00\x00\xFF\xFF",
+        "\xFF\xFF\xFF\x00\x00\xFF\x00\x00", "\xFF\xFF\xFF\x00\x00\xFF\x00\xFF",
+        "\xFF\xFF\xFF\x00\x00\xFF\xFF\x00", "\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\x00\xFF\x00\x00\x00", "\xFF\xFF\xFF\x00\xFF\x00\x00\xFF",
+        "\xFF\xFF\xFF\x00\xFF\x00\xFF\x00", "\xFF\xFF\xFF\x00\xFF\x00\xFF\xFF",
+        "\xFF\xFF\xFF\x00\xFF\xFF\x00\x00", "\xFF\xFF\xFF\x00\xFF\xFF\x00\xFF",
+        "\xFF\xFF\xFF\x00\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\x00\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\x00\x00\x00\x00", "\xFF\xFF\xFF\xFF\x00\x00\x00\xFF",
+        "\xFF\xFF\xFF\xFF\x00\x00\xFF\x00", "\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\x00\xFF\x00\x00", "\xFF\xFF\xFF\xFF\x00\xFF\x00\xFF",
+        "\xFF\xFF\xFF\xFF\x00\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\x00\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\x00\x00\x00", "\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\x00\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\x00\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\x00\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
+    ];
+
+    /**
+     * IP mapping helper table.
+     *
+     * Indexing this table with each source byte performs the initial bit permutation.
+     *
+     * @var array
+     */
+    protected static $ipmap = [
+        0x00, 0x10, 0x01, 0x11, 0x20, 0x30, 0x21, 0x31,
+        0x02, 0x12, 0x03, 0x13, 0x22, 0x32, 0x23, 0x33,
+        0x40, 0x50, 0x41, 0x51, 0x60, 0x70, 0x61, 0x71,
+        0x42, 0x52, 0x43, 0x53, 0x62, 0x72, 0x63, 0x73,
+        0x04, 0x14, 0x05, 0x15, 0x24, 0x34, 0x25, 0x35,
+        0x06, 0x16, 0x07, 0x17, 0x26, 0x36, 0x27, 0x37,
+        0x44, 0x54, 0x45, 0x55, 0x64, 0x74, 0x65, 0x75,
+        0x46, 0x56, 0x47, 0x57, 0x66, 0x76, 0x67, 0x77,
+        0x80, 0x90, 0x81, 0x91, 0xA0, 0xB0, 0xA1, 0xB1,
+        0x82, 0x92, 0x83, 0x93, 0xA2, 0xB2, 0xA3, 0xB3,
+        0xC0, 0xD0, 0xC1, 0xD1, 0xE0, 0xF0, 0xE1, 0xF1,
+        0xC2, 0xD2, 0xC3, 0xD3, 0xE2, 0xF2, 0xE3, 0xF3,
+        0x84, 0x94, 0x85, 0x95, 0xA4, 0xB4, 0xA5, 0xB5,
+        0x86, 0x96, 0x87, 0x97, 0xA6, 0xB6, 0xA7, 0xB7,
+        0xC4, 0xD4, 0xC5, 0xD5, 0xE4, 0xF4, 0xE5, 0xF5,
+        0xC6, 0xD6, 0xC7, 0xD7, 0xE6, 0xF6, 0xE7, 0xF7,
+        0x08, 0x18, 0x09, 0x19, 0x28, 0x38, 0x29, 0x39,
+        0x0A, 0x1A, 0x0B, 0x1B, 0x2A, 0x3A, 0x2B, 0x3B,
+        0x48, 0x58, 0x49, 0x59, 0x68, 0x78, 0x69, 0x79,
+        0x4A, 0x5A, 0x4B, 0x5B, 0x6A, 0x7A, 0x6B, 0x7B,
+        0x0C, 0x1C, 0x0D, 0x1D, 0x2C, 0x3C, 0x2D, 0x3D,
+        0x0E, 0x1E, 0x0F, 0x1F, 0x2E, 0x3E, 0x2F, 0x3F,
+        0x4C, 0x5C, 0x4D, 0x5D, 0x6C, 0x7C, 0x6D, 0x7D,
+        0x4E, 0x5E, 0x4F, 0x5F, 0x6E, 0x7E, 0x6F, 0x7F,
+        0x88, 0x98, 0x89, 0x99, 0xA8, 0xB8, 0xA9, 0xB9,
+        0x8A, 0x9A, 0x8B, 0x9B, 0xAA, 0xBA, 0xAB, 0xBB,
+        0xC8, 0xD8, 0xC9, 0xD9, 0xE8, 0xF8, 0xE9, 0xF9,
+        0xCA, 0xDA, 0xCB, 0xDB, 0xEA, 0xFA, 0xEB, 0xFB,
+        0x8C, 0x9C, 0x8D, 0x9D, 0xAC, 0xBC, 0xAD, 0xBD,
+        0x8E, 0x9E, 0x8F, 0x9F, 0xAE, 0xBE, 0xAF, 0xBF,
+        0xCC, 0xDC, 0xCD, 0xDD, 0xEC, 0xFC, 0xED, 0xFD,
+        0xCE, 0xDE, 0xCF, 0xDF, 0xEE, 0xFE, 0xEF, 0xFF
+    ];
+
+    /**
+     * Inverse IP mapping helper table.
+     * Indexing this table with a byte value reverses the bit order.
+     *
+     * @var array
+     */
+    protected static $invipmap = [
+        0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
+        0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
+        0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
+        0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
+        0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
+        0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
+        0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
+        0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
+        0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
+        0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
+        0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
+        0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
+        0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
+        0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
+        0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
+        0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
+        0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
+        0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
+        0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
+        0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
+        0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
+        0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
+        0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
+        0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
+        0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
+        0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
+        0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
+        0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
+        0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
+        0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
+        0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
+        0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
+    ];
+
+    /**
+     * Pre-permuted S-box1
+     *
+     * Each box ($sbox1-$sbox8) has been vectorized, then each value pre-permuted using the
+     * P table: concatenation can then be replaced by exclusive ORs.
+     *
+     * @var array
+     */
+    protected static $sbox1 = [
+        0x00808200, 0x00000000, 0x00008000, 0x00808202,
+        0x00808002, 0x00008202, 0x00000002, 0x00008000,
+        0x00000200, 0x00808200, 0x00808202, 0x00000200,
+        0x00800202, 0x00808002, 0x00800000, 0x00000002,
+        0x00000202, 0x00800200, 0x00800200, 0x00008200,
+        0x00008200, 0x00808000, 0x00808000, 0x00800202,
+        0x00008002, 0x00800002, 0x00800002, 0x00008002,
+        0x00000000, 0x00000202, 0x00008202, 0x00800000,
+        0x00008000, 0x00808202, 0x00000002, 0x00808000,
+        0x00808200, 0x00800000, 0x00800000, 0x00000200,
+        0x00808002, 0x00008000, 0x00008200, 0x00800002,
+        0x00000200, 0x00000002, 0x00800202, 0x00008202,
+        0x00808202, 0x00008002, 0x00808000, 0x00800202,
+        0x00800002, 0x00000202, 0x00008202, 0x00808200,
+        0x00000202, 0x00800200, 0x00800200, 0x00000000,
+        0x00008002, 0x00008200, 0x00000000, 0x00808002
+    ];
+
+    /**
+     * Pre-permuted S-box2
+     *
+     * @var array
+     */
+    protected static $sbox2 = [
+        0x40084010, 0x40004000, 0x00004000, 0x00084010,
+        0x00080000, 0x00000010, 0x40080010, 0x40004010,
+        0x40000010, 0x40084010, 0x40084000, 0x40000000,
+        0x40004000, 0x00080000, 0x00000010, 0x40080010,
+        0x00084000, 0x00080010, 0x40004010, 0x00000000,
+        0x40000000, 0x00004000, 0x00084010, 0x40080000,
+        0x00080010, 0x40000010, 0x00000000, 0x00084000,
+        0x00004010, 0x40084000, 0x40080000, 0x00004010,
+        0x00000000, 0x00084010, 0x40080010, 0x00080000,
+        0x40004010, 0x40080000, 0x40084000, 0x00004000,
+        0x40080000, 0x40004000, 0x00000010, 0x40084010,
+        0x00084010, 0x00000010, 0x00004000, 0x40000000,
+        0x00004010, 0x40084000, 0x00080000, 0x40000010,
+        0x00080010, 0x40004010, 0x40000010, 0x00080010,
+        0x00084000, 0x00000000, 0x40004000, 0x00004010,
+        0x40000000, 0x40080010, 0x40084010, 0x00084000
+    ];
+
+    /**
+     * Pre-permuted S-box3
+     *
+     * @var array
+     */
+    protected static $sbox3 = [
+        0x00000104, 0x04010100, 0x00000000, 0x04010004,
+        0x04000100, 0x00000000, 0x00010104, 0x04000100,
+        0x00010004, 0x04000004, 0x04000004, 0x00010000,
+        0x04010104, 0x00010004, 0x04010000, 0x00000104,
+        0x04000000, 0x00000004, 0x04010100, 0x00000100,
+        0x00010100, 0x04010000, 0x04010004, 0x00010104,
+        0x04000104, 0x00010100, 0x00010000, 0x04000104,
+        0x00000004, 0x04010104, 0x00000100, 0x04000000,
+        0x04010100, 0x04000000, 0x00010004, 0x00000104,
+        0x00010000, 0x04010100, 0x04000100, 0x00000000,
+        0x00000100, 0x00010004, 0x04010104, 0x04000100,
+        0x04000004, 0x00000100, 0x00000000, 0x04010004,
+        0x04000104, 0x00010000, 0x04000000, 0x04010104,
+        0x00000004, 0x00010104, 0x00010100, 0x04000004,
+        0x04010000, 0x04000104, 0x00000104, 0x04010000,
+        0x00010104, 0x00000004, 0x04010004, 0x00010100
+    ];
+
+    /**
+     * Pre-permuted S-box4
+     *
+     * @var array
+     */
+    protected static $sbox4 = [
+        0x80401000, 0x80001040, 0x80001040, 0x00000040,
+        0x00401040, 0x80400040, 0x80400000, 0x80001000,
+        0x00000000, 0x00401000, 0x00401000, 0x80401040,
+        0x80000040, 0x00000000, 0x00400040, 0x80400000,
+        0x80000000, 0x00001000, 0x00400000, 0x80401000,
+        0x00000040, 0x00400000, 0x80001000, 0x00001040,
+        0x80400040, 0x80000000, 0x00001040, 0x00400040,
+        0x00001000, 0x00401040, 0x80401040, 0x80000040,
+        0x00400040, 0x80400000, 0x00401000, 0x80401040,
+        0x80000040, 0x00000000, 0x00000000, 0x00401000,
+        0x00001040, 0x00400040, 0x80400040, 0x80000000,
+        0x80401000, 0x80001040, 0x80001040, 0x00000040,
+        0x80401040, 0x80000040, 0x80000000, 0x00001000,
+        0x80400000, 0x80001000, 0x00401040, 0x80400040,
+        0x80001000, 0x00001040, 0x00400000, 0x80401000,
+        0x00000040, 0x00400000, 0x00001000, 0x00401040
+    ];
+
+    /**
+     * Pre-permuted S-box5
+     *
+     * @var array
+     */
+    protected static $sbox5 = [
+        0x00000080, 0x01040080, 0x01040000, 0x21000080,
+        0x00040000, 0x00000080, 0x20000000, 0x01040000,
+        0x20040080, 0x00040000, 0x01000080, 0x20040080,
+        0x21000080, 0x21040000, 0x00040080, 0x20000000,
+        0x01000000, 0x20040000, 0x20040000, 0x00000000,
+        0x20000080, 0x21040080, 0x21040080, 0x01000080,
+        0x21040000, 0x20000080, 0x00000000, 0x21000000,
+        0x01040080, 0x01000000, 0x21000000, 0x00040080,
+        0x00040000, 0x21000080, 0x00000080, 0x01000000,
+        0x20000000, 0x01040000, 0x21000080, 0x20040080,
+        0x01000080, 0x20000000, 0x21040000, 0x01040080,
+        0x20040080, 0x00000080, 0x01000000, 0x21040000,
+        0x21040080, 0x00040080, 0x21000000, 0x21040080,
+        0x01040000, 0x00000000, 0x20040000, 0x21000000,
+        0x00040080, 0x01000080, 0x20000080, 0x00040000,
+        0x00000000, 0x20040000, 0x01040080, 0x20000080
+    ];
+
+    /**
+     * Pre-permuted S-box6
+     *
+     * @var array
+     */
+    protected static $sbox6 = [
+        0x10000008, 0x10200000, 0x00002000, 0x10202008,
+        0x10200000, 0x00000008, 0x10202008, 0x00200000,
+        0x10002000, 0x00202008, 0x00200000, 0x10000008,
+        0x00200008, 0x10002000, 0x10000000, 0x00002008,
+        0x00000000, 0x00200008, 0x10002008, 0x00002000,
+        0x00202000, 0x10002008, 0x00000008, 0x10200008,
+        0x10200008, 0x00000000, 0x00202008, 0x10202000,
+        0x00002008, 0x00202000, 0x10202000, 0x10000000,
+        0x10002000, 0x00000008, 0x10200008, 0x00202000,
+        0x10202008, 0x00200000, 0x00002008, 0x10000008,
+        0x00200000, 0x10002000, 0x10000000, 0x00002008,
+        0x10000008, 0x10202008, 0x00202000, 0x10200000,
+        0x00202008, 0x10202000, 0x00000000, 0x10200008,
+        0x00000008, 0x00002000, 0x10200000, 0x00202008,
+        0x00002000, 0x00200008, 0x10002008, 0x00000000,
+        0x10202000, 0x10000000, 0x00200008, 0x10002008
+    ];
+
+    /**
+     * Pre-permuted S-box7
+     *
+     * @var array
+     */
+    protected static $sbox7 = [
+        0x00100000, 0x02100001, 0x02000401, 0x00000000,
+        0x00000400, 0x02000401, 0x00100401, 0x02100400,
+        0x02100401, 0x00100000, 0x00000000, 0x02000001,
+        0x00000001, 0x02000000, 0x02100001, 0x00000401,
+        0x02000400, 0x00100401, 0x00100001, 0x02000400,
+        0x02000001, 0x02100000, 0x02100400, 0x00100001,
+        0x02100000, 0x00000400, 0x00000401, 0x02100401,
+        0x00100400, 0x00000001, 0x02000000, 0x00100400,
+        0x02000000, 0x00100400, 0x00100000, 0x02000401,
+        0x02000401, 0x02100001, 0x02100001, 0x00000001,
+        0x00100001, 0x02000000, 0x02000400, 0x00100000,
+        0x02100400, 0x00000401, 0x00100401, 0x02100400,
+        0x00000401, 0x02000001, 0x02100401, 0x02100000,
+        0x00100400, 0x00000000, 0x00000001, 0x02100401,
+        0x00000000, 0x00100401, 0x02100000, 0x00000400,
+        0x02000001, 0x02000400, 0x00000400, 0x00100001
+    ];
+
+    /**
+     * Pre-permuted S-box8
+     *
+     * @var array
+     */
+    protected static $sbox8 = [
+        0x08000820, 0x00000800, 0x00020000, 0x08020820,
+        0x08000000, 0x08000820, 0x00000020, 0x08000000,
+        0x00020020, 0x08020000, 0x08020820, 0x00020800,
+        0x08020800, 0x00020820, 0x00000800, 0x00000020,
+        0x08020000, 0x08000020, 0x08000800, 0x00000820,
+        0x00020800, 0x00020020, 0x08020020, 0x08020800,
+        0x00000820, 0x00000000, 0x00000000, 0x08020020,
+        0x08000020, 0x08000800, 0x00020820, 0x00020000,
+        0x00020820, 0x00020000, 0x08020800, 0x00000800,
+        0x00000020, 0x08020020, 0x00000800, 0x00020820,
+        0x08000800, 0x00000020, 0x08000020, 0x08020000,
+        0x08020020, 0x08000000, 0x00020000, 0x08000820,
+        0x00000000, 0x08020820, 0x00020020, 0x08000020,
+        0x08020000, 0x08000800, 0x08000820, 0x00000000,
+        0x08020820, 0x00020800, 0x00020800, 0x00000820,
+        0x00000820, 0x00020020, 0x08000000, 0x08020800
+    ];
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $mode
+     * @throws BadModeException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        parent::__construct($mode);
+
+        if ($this->mode == self::MODE_STREAM) {
+            throw new BadModeException('Block ciphers cannot be ran in stream mode');
+        }
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        if ($this->key_length_max == 8) {
+            if ($engine == self::ENGINE_OPENSSL) {
+                // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
+                // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
+                // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
+                if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                    return false;
+                }
+                $this->cipher_name_openssl_ecb = 'des-ecb';
+                $this->cipher_name_openssl = 'des-' . $this->openssl_translate_mode();
+            }
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys must be 64-bits long or 8 bytes long.
+     *
+     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setKey()
+     * @param string $key
+     */
+    public function setKey($key)
+    {
+        if (!($this instanceof TripleDES) && strlen($key) != 8) {
+            throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of size 8 are supported');
+        }
+
+        // Sets the key
+        parent::setKey($key);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encryptBlock()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see self::encrypt()
+     * @param string $in
+     * @return string
+     */
+    protected function encryptBlock($in)
+    {
+        return $this->processBlock($in, self::ENCRYPT);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decryptBlock()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @see self::decrypt()
+     * @param string $in
+     * @return string
+     */
+    protected function decryptBlock($in)
+    {
+        return $this->processBlock($in, self::DECRYPT);
+    }
+
+    /**
+     * Encrypts or decrypts a 64-bit block
+     *
+     * $mode should be either self::ENCRYPT or self::DECRYPT.  See
+     * {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general
+     * idea of what this function does.
+     *
+     * @see self::encryptBlock()
+     * @see self::decryptBlock()
+     * @param string $block
+     * @param int $mode
+     * @return string
+     */
+    private function processBlock($block, $mode)
+    {
+        static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
+        if (!$sbox1) {
+            $sbox1 = array_map('intval', self::$sbox1);
+            $sbox2 = array_map('intval', self::$sbox2);
+            $sbox3 = array_map('intval', self::$sbox3);
+            $sbox4 = array_map('intval', self::$sbox4);
+            $sbox5 = array_map('intval', self::$sbox5);
+            $sbox6 = array_map('intval', self::$sbox6);
+            $sbox7 = array_map('intval', self::$sbox7);
+            $sbox8 = array_map('intval', self::$sbox8);
+            /* Merge $shuffle with $[inv]ipmap */
+            for ($i = 0; $i < 256; ++$i) {
+                $shuffleip[]    =  self::$shuffle[self::$ipmap[$i]];
+                $shuffleinvip[] =  self::$shuffle[self::$invipmap[$i]];
+            }
+        }
+
+        $keys  = $this->keys[$mode];
+        $ki    = -1;
+
+        // Do the initial IP permutation.
+        $t = unpack('Nl/Nr', $block);
+        list($l, $r) = [$t['l'], $t['r']];
+        $block = ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                 ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                 ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                 ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                 ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                 ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                 ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                 ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+
+        // Extract L0 and R0.
+        $t = unpack('Nl/Nr', $block);
+        list($l, $r) = [$t['l'], $t['r']];
+
+        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
+            // Perform the 16 steps.
+            for ($i = 0; $i < 16; $i++) {
+                // start of "the Feistel (F) function" - see the following URL:
+                // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
+                // Merge key schedule.
+                $b1 = (($r >>  3) & 0x1FFFFFFF) ^ ($r << 29) ^ $keys[++$ki];
+                $b2 = (($r >> 31) & 0x00000001) ^ ($r <<  1) ^ $keys[++$ki];
+
+                // S-box indexing.
+                $t = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
+                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
+                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
+                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ $l;
+                // end of "the Feistel (F) function"
+
+                $l = $r;
+                $r = $t;
+            }
+
+            // Last step should not permute L & R.
+            $t = $l;
+            $l = $r;
+            $r = $t;
+        }
+
+        // Perform the inverse IP permutation.
+        return ($shuffleinvip[($r >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+               ($shuffleinvip[($l >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+               ($shuffleinvip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+               ($shuffleinvip[($l >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+               ($shuffleinvip[($r >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+               ($shuffleinvip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+               ($shuffleinvip[ $r        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+               ($shuffleinvip[ $l        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey()
+     */
+    protected function setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->des_rounds === $this->kl['des_rounds']) {
+            // already expanded
+            return;
+        }
+        $this->kl = ['key' => $this->key, 'des_rounds' => $this->des_rounds];
+
+        static $shifts = [ // number of key bits shifted per round
+            1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+        ];
+
+        static $pc1map = [
+            0x00, 0x00, 0x08, 0x08, 0x04, 0x04, 0x0C, 0x0C,
+            0x02, 0x02, 0x0A, 0x0A, 0x06, 0x06, 0x0E, 0x0E,
+            0x10, 0x10, 0x18, 0x18, 0x14, 0x14, 0x1C, 0x1C,
+            0x12, 0x12, 0x1A, 0x1A, 0x16, 0x16, 0x1E, 0x1E,
+            0x20, 0x20, 0x28, 0x28, 0x24, 0x24, 0x2C, 0x2C,
+            0x22, 0x22, 0x2A, 0x2A, 0x26, 0x26, 0x2E, 0x2E,
+            0x30, 0x30, 0x38, 0x38, 0x34, 0x34, 0x3C, 0x3C,
+            0x32, 0x32, 0x3A, 0x3A, 0x36, 0x36, 0x3E, 0x3E,
+            0x40, 0x40, 0x48, 0x48, 0x44, 0x44, 0x4C, 0x4C,
+            0x42, 0x42, 0x4A, 0x4A, 0x46, 0x46, 0x4E, 0x4E,
+            0x50, 0x50, 0x58, 0x58, 0x54, 0x54, 0x5C, 0x5C,
+            0x52, 0x52, 0x5A, 0x5A, 0x56, 0x56, 0x5E, 0x5E,
+            0x60, 0x60, 0x68, 0x68, 0x64, 0x64, 0x6C, 0x6C,
+            0x62, 0x62, 0x6A, 0x6A, 0x66, 0x66, 0x6E, 0x6E,
+            0x70, 0x70, 0x78, 0x78, 0x74, 0x74, 0x7C, 0x7C,
+            0x72, 0x72, 0x7A, 0x7A, 0x76, 0x76, 0x7E, 0x7E,
+            0x80, 0x80, 0x88, 0x88, 0x84, 0x84, 0x8C, 0x8C,
+            0x82, 0x82, 0x8A, 0x8A, 0x86, 0x86, 0x8E, 0x8E,
+            0x90, 0x90, 0x98, 0x98, 0x94, 0x94, 0x9C, 0x9C,
+            0x92, 0x92, 0x9A, 0x9A, 0x96, 0x96, 0x9E, 0x9E,
+            0xA0, 0xA0, 0xA8, 0xA8, 0xA4, 0xA4, 0xAC, 0xAC,
+            0xA2, 0xA2, 0xAA, 0xAA, 0xA6, 0xA6, 0xAE, 0xAE,
+            0xB0, 0xB0, 0xB8, 0xB8, 0xB4, 0xB4, 0xBC, 0xBC,
+            0xB2, 0xB2, 0xBA, 0xBA, 0xB6, 0xB6, 0xBE, 0xBE,
+            0xC0, 0xC0, 0xC8, 0xC8, 0xC4, 0xC4, 0xCC, 0xCC,
+            0xC2, 0xC2, 0xCA, 0xCA, 0xC6, 0xC6, 0xCE, 0xCE,
+            0xD0, 0xD0, 0xD8, 0xD8, 0xD4, 0xD4, 0xDC, 0xDC,
+            0xD2, 0xD2, 0xDA, 0xDA, 0xD6, 0xD6, 0xDE, 0xDE,
+            0xE0, 0xE0, 0xE8, 0xE8, 0xE4, 0xE4, 0xEC, 0xEC,
+            0xE2, 0xE2, 0xEA, 0xEA, 0xE6, 0xE6, 0xEE, 0xEE,
+            0xF0, 0xF0, 0xF8, 0xF8, 0xF4, 0xF4, 0xFC, 0xFC,
+            0xF2, 0xF2, 0xFA, 0xFA, 0xF6, 0xF6, 0xFE, 0xFE
+        ];
+
+        // Mapping tables for the PC-2 transformation.
+        static $pc2mapc1 = [
+            0x00000000, 0x00000400, 0x00200000, 0x00200400,
+            0x00000001, 0x00000401, 0x00200001, 0x00200401,
+            0x02000000, 0x02000400, 0x02200000, 0x02200400,
+            0x02000001, 0x02000401, 0x02200001, 0x02200401
+        ];
+        static $pc2mapc2 = [
+            0x00000000, 0x00000800, 0x08000000, 0x08000800,
+            0x00010000, 0x00010800, 0x08010000, 0x08010800,
+            0x00000000, 0x00000800, 0x08000000, 0x08000800,
+            0x00010000, 0x00010800, 0x08010000, 0x08010800,
+            0x00000100, 0x00000900, 0x08000100, 0x08000900,
+            0x00010100, 0x00010900, 0x08010100, 0x08010900,
+            0x00000100, 0x00000900, 0x08000100, 0x08000900,
+            0x00010100, 0x00010900, 0x08010100, 0x08010900,
+            0x00000010, 0x00000810, 0x08000010, 0x08000810,
+            0x00010010, 0x00010810, 0x08010010, 0x08010810,
+            0x00000010, 0x00000810, 0x08000010, 0x08000810,
+            0x00010010, 0x00010810, 0x08010010, 0x08010810,
+            0x00000110, 0x00000910, 0x08000110, 0x08000910,
+            0x00010110, 0x00010910, 0x08010110, 0x08010910,
+            0x00000110, 0x00000910, 0x08000110, 0x08000910,
+            0x00010110, 0x00010910, 0x08010110, 0x08010910,
+            0x00040000, 0x00040800, 0x08040000, 0x08040800,
+            0x00050000, 0x00050800, 0x08050000, 0x08050800,
+            0x00040000, 0x00040800, 0x08040000, 0x08040800,
+            0x00050000, 0x00050800, 0x08050000, 0x08050800,
+            0x00040100, 0x00040900, 0x08040100, 0x08040900,
+            0x00050100, 0x00050900, 0x08050100, 0x08050900,
+            0x00040100, 0x00040900, 0x08040100, 0x08040900,
+            0x00050100, 0x00050900, 0x08050100, 0x08050900,
+            0x00040010, 0x00040810, 0x08040010, 0x08040810,
+            0x00050010, 0x00050810, 0x08050010, 0x08050810,
+            0x00040010, 0x00040810, 0x08040010, 0x08040810,
+            0x00050010, 0x00050810, 0x08050010, 0x08050810,
+            0x00040110, 0x00040910, 0x08040110, 0x08040910,
+            0x00050110, 0x00050910, 0x08050110, 0x08050910,
+            0x00040110, 0x00040910, 0x08040110, 0x08040910,
+            0x00050110, 0x00050910, 0x08050110, 0x08050910,
+            0x01000000, 0x01000800, 0x09000000, 0x09000800,
+            0x01010000, 0x01010800, 0x09010000, 0x09010800,
+            0x01000000, 0x01000800, 0x09000000, 0x09000800,
+            0x01010000, 0x01010800, 0x09010000, 0x09010800,
+            0x01000100, 0x01000900, 0x09000100, 0x09000900,
+            0x01010100, 0x01010900, 0x09010100, 0x09010900,
+            0x01000100, 0x01000900, 0x09000100, 0x09000900,
+            0x01010100, 0x01010900, 0x09010100, 0x09010900,
+            0x01000010, 0x01000810, 0x09000010, 0x09000810,
+            0x01010010, 0x01010810, 0x09010010, 0x09010810,
+            0x01000010, 0x01000810, 0x09000010, 0x09000810,
+            0x01010010, 0x01010810, 0x09010010, 0x09010810,
+            0x01000110, 0x01000910, 0x09000110, 0x09000910,
+            0x01010110, 0x01010910, 0x09010110, 0x09010910,
+            0x01000110, 0x01000910, 0x09000110, 0x09000910,
+            0x01010110, 0x01010910, 0x09010110, 0x09010910,
+            0x01040000, 0x01040800, 0x09040000, 0x09040800,
+            0x01050000, 0x01050800, 0x09050000, 0x09050800,
+            0x01040000, 0x01040800, 0x09040000, 0x09040800,
+            0x01050000, 0x01050800, 0x09050000, 0x09050800,
+            0x01040100, 0x01040900, 0x09040100, 0x09040900,
+            0x01050100, 0x01050900, 0x09050100, 0x09050900,
+            0x01040100, 0x01040900, 0x09040100, 0x09040900,
+            0x01050100, 0x01050900, 0x09050100, 0x09050900,
+            0x01040010, 0x01040810, 0x09040010, 0x09040810,
+            0x01050010, 0x01050810, 0x09050010, 0x09050810,
+            0x01040010, 0x01040810, 0x09040010, 0x09040810,
+            0x01050010, 0x01050810, 0x09050010, 0x09050810,
+            0x01040110, 0x01040910, 0x09040110, 0x09040910,
+            0x01050110, 0x01050910, 0x09050110, 0x09050910,
+            0x01040110, 0x01040910, 0x09040110, 0x09040910,
+            0x01050110, 0x01050910, 0x09050110, 0x09050910
+        ];
+        static $pc2mapc3 = [
+            0x00000000, 0x00000004, 0x00001000, 0x00001004,
+            0x00000000, 0x00000004, 0x00001000, 0x00001004,
+            0x10000000, 0x10000004, 0x10001000, 0x10001004,
+            0x10000000, 0x10000004, 0x10001000, 0x10001004,
+            0x00000020, 0x00000024, 0x00001020, 0x00001024,
+            0x00000020, 0x00000024, 0x00001020, 0x00001024,
+            0x10000020, 0x10000024, 0x10001020, 0x10001024,
+            0x10000020, 0x10000024, 0x10001020, 0x10001024,
+            0x00080000, 0x00080004, 0x00081000, 0x00081004,
+            0x00080000, 0x00080004, 0x00081000, 0x00081004,
+            0x10080000, 0x10080004, 0x10081000, 0x10081004,
+            0x10080000, 0x10080004, 0x10081000, 0x10081004,
+            0x00080020, 0x00080024, 0x00081020, 0x00081024,
+            0x00080020, 0x00080024, 0x00081020, 0x00081024,
+            0x10080020, 0x10080024, 0x10081020, 0x10081024,
+            0x10080020, 0x10080024, 0x10081020, 0x10081024,
+            0x20000000, 0x20000004, 0x20001000, 0x20001004,
+            0x20000000, 0x20000004, 0x20001000, 0x20001004,
+            0x30000000, 0x30000004, 0x30001000, 0x30001004,
+            0x30000000, 0x30000004, 0x30001000, 0x30001004,
+            0x20000020, 0x20000024, 0x20001020, 0x20001024,
+            0x20000020, 0x20000024, 0x20001020, 0x20001024,
+            0x30000020, 0x30000024, 0x30001020, 0x30001024,
+            0x30000020, 0x30000024, 0x30001020, 0x30001024,
+            0x20080000, 0x20080004, 0x20081000, 0x20081004,
+            0x20080000, 0x20080004, 0x20081000, 0x20081004,
+            0x30080000, 0x30080004, 0x30081000, 0x30081004,
+            0x30080000, 0x30080004, 0x30081000, 0x30081004,
+            0x20080020, 0x20080024, 0x20081020, 0x20081024,
+            0x20080020, 0x20080024, 0x20081020, 0x20081024,
+            0x30080020, 0x30080024, 0x30081020, 0x30081024,
+            0x30080020, 0x30080024, 0x30081020, 0x30081024,
+            0x00000002, 0x00000006, 0x00001002, 0x00001006,
+            0x00000002, 0x00000006, 0x00001002, 0x00001006,
+            0x10000002, 0x10000006, 0x10001002, 0x10001006,
+            0x10000002, 0x10000006, 0x10001002, 0x10001006,
+            0x00000022, 0x00000026, 0x00001022, 0x00001026,
+            0x00000022, 0x00000026, 0x00001022, 0x00001026,
+            0x10000022, 0x10000026, 0x10001022, 0x10001026,
+            0x10000022, 0x10000026, 0x10001022, 0x10001026,
+            0x00080002, 0x00080006, 0x00081002, 0x00081006,
+            0x00080002, 0x00080006, 0x00081002, 0x00081006,
+            0x10080002, 0x10080006, 0x10081002, 0x10081006,
+            0x10080002, 0x10080006, 0x10081002, 0x10081006,
+            0x00080022, 0x00080026, 0x00081022, 0x00081026,
+            0x00080022, 0x00080026, 0x00081022, 0x00081026,
+            0x10080022, 0x10080026, 0x10081022, 0x10081026,
+            0x10080022, 0x10080026, 0x10081022, 0x10081026,
+            0x20000002, 0x20000006, 0x20001002, 0x20001006,
+            0x20000002, 0x20000006, 0x20001002, 0x20001006,
+            0x30000002, 0x30000006, 0x30001002, 0x30001006,
+            0x30000002, 0x30000006, 0x30001002, 0x30001006,
+            0x20000022, 0x20000026, 0x20001022, 0x20001026,
+            0x20000022, 0x20000026, 0x20001022, 0x20001026,
+            0x30000022, 0x30000026, 0x30001022, 0x30001026,
+            0x30000022, 0x30000026, 0x30001022, 0x30001026,
+            0x20080002, 0x20080006, 0x20081002, 0x20081006,
+            0x20080002, 0x20080006, 0x20081002, 0x20081006,
+            0x30080002, 0x30080006, 0x30081002, 0x30081006,
+            0x30080002, 0x30080006, 0x30081002, 0x30081006,
+            0x20080022, 0x20080026, 0x20081022, 0x20081026,
+            0x20080022, 0x20080026, 0x20081022, 0x20081026,
+            0x30080022, 0x30080026, 0x30081022, 0x30081026,
+            0x30080022, 0x30080026, 0x30081022, 0x30081026
+        ];
+        static $pc2mapc4 = [
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208
+        ];
+        static $pc2mapd1 = [
+            0x00000000, 0x00000001, 0x08000000, 0x08000001,
+            0x00200000, 0x00200001, 0x08200000, 0x08200001,
+            0x00000002, 0x00000003, 0x08000002, 0x08000003,
+            0x00200002, 0x00200003, 0x08200002, 0x08200003
+        ];
+        static $pc2mapd2 = [
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04
+        ];
+        static $pc2mapd3 = [
+            0x00000000, 0x00010000, 0x02000000, 0x02010000,
+            0x00000020, 0x00010020, 0x02000020, 0x02010020,
+            0x00040000, 0x00050000, 0x02040000, 0x02050000,
+            0x00040020, 0x00050020, 0x02040020, 0x02050020,
+            0x00002000, 0x00012000, 0x02002000, 0x02012000,
+            0x00002020, 0x00012020, 0x02002020, 0x02012020,
+            0x00042000, 0x00052000, 0x02042000, 0x02052000,
+            0x00042020, 0x00052020, 0x02042020, 0x02052020,
+            0x00000000, 0x00010000, 0x02000000, 0x02010000,
+            0x00000020, 0x00010020, 0x02000020, 0x02010020,
+            0x00040000, 0x00050000, 0x02040000, 0x02050000,
+            0x00040020, 0x00050020, 0x02040020, 0x02050020,
+            0x00002000, 0x00012000, 0x02002000, 0x02012000,
+            0x00002020, 0x00012020, 0x02002020, 0x02012020,
+            0x00042000, 0x00052000, 0x02042000, 0x02052000,
+            0x00042020, 0x00052020, 0x02042020, 0x02052020,
+            0x00000010, 0x00010010, 0x02000010, 0x02010010,
+            0x00000030, 0x00010030, 0x02000030, 0x02010030,
+            0x00040010, 0x00050010, 0x02040010, 0x02050010,
+            0x00040030, 0x00050030, 0x02040030, 0x02050030,
+            0x00002010, 0x00012010, 0x02002010, 0x02012010,
+            0x00002030, 0x00012030, 0x02002030, 0x02012030,
+            0x00042010, 0x00052010, 0x02042010, 0x02052010,
+            0x00042030, 0x00052030, 0x02042030, 0x02052030,
+            0x00000010, 0x00010010, 0x02000010, 0x02010010,
+            0x00000030, 0x00010030, 0x02000030, 0x02010030,
+            0x00040010, 0x00050010, 0x02040010, 0x02050010,
+            0x00040030, 0x00050030, 0x02040030, 0x02050030,
+            0x00002010, 0x00012010, 0x02002010, 0x02012010,
+            0x00002030, 0x00012030, 0x02002030, 0x02012030,
+            0x00042010, 0x00052010, 0x02042010, 0x02052010,
+            0x00042030, 0x00052030, 0x02042030, 0x02052030,
+            0x20000000, 0x20010000, 0x22000000, 0x22010000,
+            0x20000020, 0x20010020, 0x22000020, 0x22010020,
+            0x20040000, 0x20050000, 0x22040000, 0x22050000,
+            0x20040020, 0x20050020, 0x22040020, 0x22050020,
+            0x20002000, 0x20012000, 0x22002000, 0x22012000,
+            0x20002020, 0x20012020, 0x22002020, 0x22012020,
+            0x20042000, 0x20052000, 0x22042000, 0x22052000,
+            0x20042020, 0x20052020, 0x22042020, 0x22052020,
+            0x20000000, 0x20010000, 0x22000000, 0x22010000,
+            0x20000020, 0x20010020, 0x22000020, 0x22010020,
+            0x20040000, 0x20050000, 0x22040000, 0x22050000,
+            0x20040020, 0x20050020, 0x22040020, 0x22050020,
+            0x20002000, 0x20012000, 0x22002000, 0x22012000,
+            0x20002020, 0x20012020, 0x22002020, 0x22012020,
+            0x20042000, 0x20052000, 0x22042000, 0x22052000,
+            0x20042020, 0x20052020, 0x22042020, 0x22052020,
+            0x20000010, 0x20010010, 0x22000010, 0x22010010,
+            0x20000030, 0x20010030, 0x22000030, 0x22010030,
+            0x20040010, 0x20050010, 0x22040010, 0x22050010,
+            0x20040030, 0x20050030, 0x22040030, 0x22050030,
+            0x20002010, 0x20012010, 0x22002010, 0x22012010,
+            0x20002030, 0x20012030, 0x22002030, 0x22012030,
+            0x20042010, 0x20052010, 0x22042010, 0x22052010,
+            0x20042030, 0x20052030, 0x22042030, 0x22052030,
+            0x20000010, 0x20010010, 0x22000010, 0x22010010,
+            0x20000030, 0x20010030, 0x22000030, 0x22010030,
+            0x20040010, 0x20050010, 0x22040010, 0x22050010,
+            0x20040030, 0x20050030, 0x22040030, 0x22050030,
+            0x20002010, 0x20012010, 0x22002010, 0x22012010,
+            0x20002030, 0x20012030, 0x22002030, 0x22012030,
+            0x20042010, 0x20052010, 0x22042010, 0x22052010,
+            0x20042030, 0x20052030, 0x22042030, 0x22052030
+        ];
+        static $pc2mapd4 = [
+            0x00000000, 0x00000400, 0x01000000, 0x01000400,
+            0x00000000, 0x00000400, 0x01000000, 0x01000400,
+            0x00000100, 0x00000500, 0x01000100, 0x01000500,
+            0x00000100, 0x00000500, 0x01000100, 0x01000500,
+            0x10000000, 0x10000400, 0x11000000, 0x11000400,
+            0x10000000, 0x10000400, 0x11000000, 0x11000400,
+            0x10000100, 0x10000500, 0x11000100, 0x11000500,
+            0x10000100, 0x10000500, 0x11000100, 0x11000500,
+            0x00080000, 0x00080400, 0x01080000, 0x01080400,
+            0x00080000, 0x00080400, 0x01080000, 0x01080400,
+            0x00080100, 0x00080500, 0x01080100, 0x01080500,
+            0x00080100, 0x00080500, 0x01080100, 0x01080500,
+            0x10080000, 0x10080400, 0x11080000, 0x11080400,
+            0x10080000, 0x10080400, 0x11080000, 0x11080400,
+            0x10080100, 0x10080500, 0x11080100, 0x11080500,
+            0x10080100, 0x10080500, 0x11080100, 0x11080500,
+            0x00000008, 0x00000408, 0x01000008, 0x01000408,
+            0x00000008, 0x00000408, 0x01000008, 0x01000408,
+            0x00000108, 0x00000508, 0x01000108, 0x01000508,
+            0x00000108, 0x00000508, 0x01000108, 0x01000508,
+            0x10000008, 0x10000408, 0x11000008, 0x11000408,
+            0x10000008, 0x10000408, 0x11000008, 0x11000408,
+            0x10000108, 0x10000508, 0x11000108, 0x11000508,
+            0x10000108, 0x10000508, 0x11000108, 0x11000508,
+            0x00080008, 0x00080408, 0x01080008, 0x01080408,
+            0x00080008, 0x00080408, 0x01080008, 0x01080408,
+            0x00080108, 0x00080508, 0x01080108, 0x01080508,
+            0x00080108, 0x00080508, 0x01080108, 0x01080508,
+            0x10080008, 0x10080408, 0x11080008, 0x11080408,
+            0x10080008, 0x10080408, 0x11080008, 0x11080408,
+            0x10080108, 0x10080508, 0x11080108, 0x11080508,
+            0x10080108, 0x10080508, 0x11080108, 0x11080508,
+            0x00001000, 0x00001400, 0x01001000, 0x01001400,
+            0x00001000, 0x00001400, 0x01001000, 0x01001400,
+            0x00001100, 0x00001500, 0x01001100, 0x01001500,
+            0x00001100, 0x00001500, 0x01001100, 0x01001500,
+            0x10001000, 0x10001400, 0x11001000, 0x11001400,
+            0x10001000, 0x10001400, 0x11001000, 0x11001400,
+            0x10001100, 0x10001500, 0x11001100, 0x11001500,
+            0x10001100, 0x10001500, 0x11001100, 0x11001500,
+            0x00081000, 0x00081400, 0x01081000, 0x01081400,
+            0x00081000, 0x00081400, 0x01081000, 0x01081400,
+            0x00081100, 0x00081500, 0x01081100, 0x01081500,
+            0x00081100, 0x00081500, 0x01081100, 0x01081500,
+            0x10081000, 0x10081400, 0x11081000, 0x11081400,
+            0x10081000, 0x10081400, 0x11081000, 0x11081400,
+            0x10081100, 0x10081500, 0x11081100, 0x11081500,
+            0x10081100, 0x10081500, 0x11081100, 0x11081500,
+            0x00001008, 0x00001408, 0x01001008, 0x01001408,
+            0x00001008, 0x00001408, 0x01001008, 0x01001408,
+            0x00001108, 0x00001508, 0x01001108, 0x01001508,
+            0x00001108, 0x00001508, 0x01001108, 0x01001508,
+            0x10001008, 0x10001408, 0x11001008, 0x11001408,
+            0x10001008, 0x10001408, 0x11001008, 0x11001408,
+            0x10001108, 0x10001508, 0x11001108, 0x11001508,
+            0x10001108, 0x10001508, 0x11001108, 0x11001508,
+            0x00081008, 0x00081408, 0x01081008, 0x01081408,
+            0x00081008, 0x00081408, 0x01081008, 0x01081408,
+            0x00081108, 0x00081508, 0x01081108, 0x01081508,
+            0x00081108, 0x00081508, 0x01081108, 0x01081508,
+            0x10081008, 0x10081408, 0x11081008, 0x11081408,
+            0x10081008, 0x10081408, 0x11081008, 0x11081408,
+            0x10081108, 0x10081508, 0x11081108, 0x11081508,
+            0x10081108, 0x10081508, 0x11081108, 0x11081508
+        ];
+
+        $keys = [];
+        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
+            // pad the key and remove extra characters as appropriate.
+            $key = str_pad(substr($this->key, $des_round * 8, 8), 8, "\0");
+
+            // Perform the PC/1 transformation and compute C and D.
+            $t = unpack('Nl/Nr', $key);
+            list($l, $r) = [$t['l'], $t['r']];
+            $key = (self::$shuffle[$pc1map[ $r        & 0xFF]] & "\x80\x80\x80\x80\x80\x80\x80\x00") |
+                   (self::$shuffle[$pc1map[($r >>  8) & 0xFF]] & "\x40\x40\x40\x40\x40\x40\x40\x00") |
+                   (self::$shuffle[$pc1map[($r >> 16) & 0xFF]] & "\x20\x20\x20\x20\x20\x20\x20\x00") |
+                   (self::$shuffle[$pc1map[($r >> 24) & 0xFF]] & "\x10\x10\x10\x10\x10\x10\x10\x00") |
+                   (self::$shuffle[$pc1map[ $l        & 0xFF]] & "\x08\x08\x08\x08\x08\x08\x08\x00") |
+                   (self::$shuffle[$pc1map[($l >>  8) & 0xFF]] & "\x04\x04\x04\x04\x04\x04\x04\x00") |
+                   (self::$shuffle[$pc1map[($l >> 16) & 0xFF]] & "\x02\x02\x02\x02\x02\x02\x02\x00") |
+                   (self::$shuffle[$pc1map[($l >> 24) & 0xFF]] & "\x01\x01\x01\x01\x01\x01\x01\x00");
+            $key = unpack('Nc/Nd', $key);
+            $c = ( $key['c'] >> 4) & 0x0FFFFFFF;
+            $d = (($key['d'] >> 4) & 0x0FFFFFF0) | ($key['c'] & 0x0F);
+
+            $keys[$des_round] = [
+                self::ENCRYPT => [],
+                self::DECRYPT => array_fill(0, 32, 0)
+            ];
+            for ($i = 0, $ki = 31; $i < 16; ++$i, $ki -= 2) {
+                $c <<= $shifts[$i];
+                $c = ($c | ($c >> 28)) & 0x0FFFFFFF;
+                $d <<= $shifts[$i];
+                $d = ($d | ($d >> 28)) & 0x0FFFFFFF;
+
+                // Perform the PC-2 transformation.
+                $cp = $pc2mapc1[ $c >> 24        ] | $pc2mapc2[($c >> 16) & 0xFF] |
+                      $pc2mapc3[($c >>  8) & 0xFF] | $pc2mapc4[ $c        & 0xFF];
+                $dp = $pc2mapd1[ $d >> 24        ] | $pc2mapd2[($d >> 16) & 0xFF] |
+                      $pc2mapd3[($d >>  8) & 0xFF] | $pc2mapd4[ $d        & 0xFF];
+
+                // Reorder: odd bytes/even bytes. Push the result in key schedule.
+                $val1 = ( $cp        & intval(0xFF000000)) | (($cp <<  8) & 0x00FF0000) |
+                        (($dp >> 16) & 0x0000FF00) | (($dp >>  8) & 0x000000FF);
+                $val2 = (($cp <<  8) & intval(0xFF000000)) | (($cp << 16) & 0x00FF0000) |
+                        (($dp >>  8) & 0x0000FF00) | ( $dp        & 0x000000FF);
+                $keys[$des_round][self::ENCRYPT][       ] = $val1;
+                $keys[$des_round][self::DECRYPT][$ki - 1] = $val1;
+                $keys[$des_round][self::ENCRYPT][       ] = $val2;
+                $keys[$des_round][self::DECRYPT][$ki    ] = $val2;
+            }
+        }
+
+        switch ($this->des_rounds) {
+            case 3: // 3DES keys
+                $this->keys = [
+                    self::ENCRYPT => array_merge(
+                        $keys[0][self::ENCRYPT],
+                        $keys[1][self::DECRYPT],
+                        $keys[2][self::ENCRYPT]
+                    ),
+                    self::DECRYPT => array_merge(
+                        $keys[2][self::DECRYPT],
+                        $keys[1][self::ENCRYPT],
+                        $keys[0][self::DECRYPT]
+                    )
+                ];
+                break;
+            // case 1: // DES keys
+            default:
+                $this->keys = [
+                    self::ENCRYPT => $keys[0][self::ENCRYPT],
+                    self::DECRYPT => $keys[0][self::DECRYPT]
+                ];
+        }
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupInlineCrypt()
+     */
+    protected function setupInlineCrypt()
+    {
+        // Engine configuration for:
+        // -  DES ($des_rounds == 1) or
+        // - 3DES ($des_rounds == 3)
+        $des_rounds = $this->des_rounds;
+
+        $init_crypt = 'static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
+            if (!$sbox1) {
+                $sbox1 = array_map("intval", self::$sbox1);
+                $sbox2 = array_map("intval", self::$sbox2);
+                $sbox3 = array_map("intval", self::$sbox3);
+                $sbox4 = array_map("intval", self::$sbox4);
+                $sbox5 = array_map("intval", self::$sbox5);
+                $sbox6 = array_map("intval", self::$sbox6);
+                $sbox7 = array_map("intval", self::$sbox7);
+                $sbox8 = array_map("intval", self::$sbox8);'
+                /* Merge $shuffle with $[inv]ipmap */ . '
+                for ($i = 0; $i < 256; ++$i) {
+                    $shuffleip[]    =  self::$shuffle[self::$ipmap[$i]];
+                    $shuffleinvip[] =  self::$shuffle[self::$invipmap[$i]];
+                }
+            }
+        ';
+
+        $k = [
+            self::ENCRYPT => $this->keys[self::ENCRYPT],
+            self::DECRYPT => $this->keys[self::DECRYPT]
+        ];
+        $init_encrypt = '';
+        $init_decrypt = '';
+
+        // Creating code for en- and decryption.
+        $crypt_block = [];
+        foreach ([self::ENCRYPT, self::DECRYPT] as $c) {
+            /* Do the initial IP permutation. */
+            $crypt_block[$c] = '
+                $in = unpack("N*", $in);
+                $l  = $in[1];
+                $r  = $in[2];
+                $in = unpack("N*",
+                    ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                    ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                    ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                    ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                    ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                    ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                    ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                    ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01")
+                );
+                ' . /* Extract L0 and R0 */ '
+                $l = $in[1];
+                $r = $in[2];
+            ';
+
+            $l = '$l';
+            $r = '$r';
+
+            // Perform DES or 3DES.
+            for ($ki = -1, $des_round = 0; $des_round < $des_rounds; ++$des_round) {
+                // Perform the 16 steps.
+                for ($i = 0; $i < 16; ++$i) {
+                    // start of "the Feistel (F) function" - see the following URL:
+                    // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
+                    // Merge key schedule.
+                    $crypt_block[$c] .= '
+                        $b1 = ((' . $r . ' >>  3) & 0x1FFFFFFF)  ^ (' . $r . ' << 29) ^ ' . $k[$c][++$ki] . ';
+                        $b2 = ((' . $r . ' >> 31) & 0x00000001)  ^ (' . $r . ' <<  1) ^ ' . $k[$c][++$ki] . ';' .
+                        /* S-box indexing. */
+                        $l . ' = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
+                                 $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
+                                 $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
+                                 $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ ' . $l . ';
+                    ';
+                    // end of "the Feistel (F) function"
+
+                    // swap L & R
+                    list($l, $r) = [$r, $l];
+                }
+                list($l, $r) = [$r, $l];
+            }
+
+            // Perform the inverse IP permutation.
+            $crypt_block[$c] .= '$in =
+                ($shuffleinvip[($l >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                ($shuffleinvip[($r >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                ($shuffleinvip[($l >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                ($shuffleinvip[($r >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                ($shuffleinvip[($l >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                ($shuffleinvip[($r >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                ($shuffleinvip[ $l        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                ($shuffleinvip[ $r        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+            ';
+        }
+
+        // Creates the inline-crypt function
+        $this->inline_crypt = $this->createInlineCryptFunction(
+            [
+               'init_crypt'    => $init_crypt,
+               'init_encrypt'  => $init_encrypt,
+               'init_decrypt'  => $init_decrypt,
+               'encrypt_block' => $crypt_block[self::ENCRYPT],
+               'decrypt_block' => $crypt_block[self::DECRYPT]
+            ]
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,405 @@
+<?php
+
+/**
+ * Pure-PHP (EC)DH implementation
+ *
+ * PHP version 5
+ *
+ * Here's an example of how to compute a shared secret with this library:
+ * <code>
+ * <?php
+ * include 'vendor/autoload.php';
+ *
+ * $ourPrivate = \phpseclib3\Crypt\DH::createKey();
+ * $secret = DH::computeSecret($ourPrivate, $theirPublic);
+ *
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\DH\Parameters;
+use phpseclib3\Crypt\DH\PrivateKey;
+use phpseclib3\Crypt\DH\PublicKey;
+use phpseclib3\Exception\NoKeyLoadedException;
+use phpseclib3\Exception\UnsupportedOperationException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP (EC)DH implementation
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DH extends AsymmetricKey
+{
+    /**
+     * Algorithm Name
+     *
+     * @var string
+     */
+    const ALGORITHM = 'DH';
+
+    /**
+     * DH prime
+     *
+     * @var BigInteger
+     */
+    protected $prime;
+
+    /**
+     * DH Base
+     *
+     * Prime divisor of p-1
+     *
+     * @var BigInteger
+     */
+    protected $base;
+
+    /**
+     * Public Key
+     *
+     * @var BigInteger
+     */
+    protected $publicKey;
+
+    /**
+     * Create DH parameters
+     *
+     * This method is a bit polymorphic. It can take any of the following:
+     *  - two BigInteger's (prime and base)
+     *  - an integer representing the size of the prime in bits (the base is assumed to be 2)
+     *  - a string (eg. diffie-hellman-group14-sha1)
+     *
+     * @return Parameters
+     */
+    public static function createParameters(...$args)
+    {
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createParameters() should not be called from final classes (' . static::class . ')');
+        }
+
+        $params = new Parameters();
+        if (count($args) == 2 && $args[0] instanceof BigInteger && $args[1] instanceof BigInteger) {
+            //if (!$args[0]->isPrime()) {
+            //    throw new \InvalidArgumentException('The first parameter should be a prime number');
+            //}
+            $params->prime = $args[0];
+            $params->base = $args[1];
+            return $params;
+        } elseif (count($args) == 1 && is_numeric($args[0])) {
+            $params->prime = BigInteger::randomPrime($args[0]);
+            $params->base = new BigInteger(2);
+            return $params;
+        } elseif (count($args) != 1 || !is_string($args[0])) {
+            throw new \InvalidArgumentException('Valid parameters are either: two BigInteger\'s (prime and base), a single integer (the length of the prime; base is assumed to be 2) or a string');
+        }
+        switch ($args[0]) {
+            // see http://tools.ietf.org/html/rfc2409#section-6.2 and
+            // http://tools.ietf.org/html/rfc2412, appendex E
+            case 'diffie-hellman-group1-sha1':
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
+                break;
+            // see http://tools.ietf.org/html/rfc3526#section-3
+            case 'diffie-hellman-group14-sha1': // 2048-bit MODP Group
+            case 'diffie-hellman-group14-sha256':
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                         '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
+                break;
+            // see https://tools.ietf.org/html/rfc3526#section-4
+            case 'diffie-hellman-group15-sha512': // 3072-bit MODP Group
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
+                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
+                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
+                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
+                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF';
+                break;
+            // see https://tools.ietf.org/html/rfc3526#section-5
+            case 'diffie-hellman-group16-sha512': // 4096-bit MODP Group
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
+                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
+                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
+                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
+                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
+                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
+                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
+                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
+                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199FFFFFFFFFFFFFFFF';
+                break;
+            // see https://tools.ietf.org/html/rfc3526#section-6
+            case 'diffie-hellman-group17-sha512': // 6144-bit MODP Group
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
+                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
+                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
+                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
+                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
+                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
+                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
+                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
+                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C93402849236C3FAB4D27C7026' .
+                         'C1D4DCB2602646DEC9751E763DBA37BDF8FF9406AD9E530EE5DB382F413001AE' .
+                         'B06A53ED9027D831179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B' .
+                         'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF5983CA01C64B92EC' .
+                         'F032EA15D1721D03F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E' .
+                         '59E7C97FBEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA' .
+                         'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58BB7C5DA76' .
+                         'F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632387FE8D76E3C0468' .
+                         '043E8F663F4860EE12BF2D5B0B7474D6E694F91E6DCC4024FFFFFFFFFFFFFFFF';
+                break;
+            // see https://tools.ietf.org/html/rfc3526#section-7
+            case 'diffie-hellman-group18-sha512': // 8192-bit MODP Group
+                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
+                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
+                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
+                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
+                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
+                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
+                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
+                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
+                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C93402849236C3FAB4D27C7026' .
+                         'C1D4DCB2602646DEC9751E763DBA37BDF8FF9406AD9E530EE5DB382F413001AE' .
+                         'B06A53ED9027D831179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B' .
+                         'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF5983CA01C64B92EC' .
+                         'F032EA15D1721D03F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E' .
+                         '59E7C97FBEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA' .
+                         'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58BB7C5DA76' .
+                         'F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632387FE8D76E3C0468' .
+                         '043E8F663F4860EE12BF2D5B0B7474D6E694F91E6DBE115974A3926F12FEE5E4' .
+                         '38777CB6A932DF8CD8BEC4D073B931BA3BC832B68D9DD300741FA7BF8AFC47ED' .
+                         '2576F6936BA424663AAB639C5AE4F5683423B4742BF1C978238F16CBE39D652D' .
+                         'E3FDB8BEFC848AD922222E04A4037C0713EB57A81A23F0C73473FC646CEA306B' .
+                         '4BCBC8862F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A6' .
+                         '6D2A13F83F44F82DDF310EE074AB6A364597E899A0255DC164F31CC50846851D' .
+                         'F9AB48195DED7EA1B1D510BD7EE74D73FAF36BC31ECFA268359046F4EB879F92' .
+                         '4009438B481C6CD7889A002ED5EE382BC9190DA6FC026E479558E4475677E9AA' .
+                         '9E3050E2765694DFC81F56E880B96E7160C980DD98EDD3DFFFFFFFFFFFFFFFFF';
+                break;
+            default:
+                throw new \InvalidArgumentException('Invalid named prime provided');
+        }
+
+        $params->prime = new BigInteger($prime, 16);
+        $params->base = new BigInteger(2);
+
+        return $params;
+    }
+
+    /**
+     * Create public / private key pair.
+     *
+     * The rationale for the second parameter is described in http://tools.ietf.org/html/rfc4419#section-6.2 :
+     *
+     * "To increase the speed of the key exchange, both client and server may
+     *  reduce the size of their private exponents.  It should be at least
+     *  twice as long as the key material that is generated from the shared
+     *  secret.  For more details, see the paper by van Oorschot and Wiener
+     *  [VAN-OORSCHOT]."
+     *
+     * $length is in bits
+     *
+     * @param Parameters $params
+     * @param int $length optional
+     * @return PrivateKey
+     */
+    public static function createKey(Parameters $params, $length = 0)
+    {
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createKey() should not be called from final classes (' . static::class . ')');
+        }
+
+        $one = new BigInteger(1);
+        if ($length) {
+            $max = $one->bitwise_leftShift($length);
+            $max = $max->subtract($one);
+        } else {
+            $max = $params->prime->subtract($one);
+        }
+
+        $key = new PrivateKey();
+        $key->prime = $params->prime;
+        $key->base = $params->base;
+        $key->privateKey = BigInteger::randomRange($one, $max);
+        $key->publicKey = $key->base->powMod($key->privateKey, $key->prime);
+        return $key;
+    }
+
+    /**
+     * Compute Shared Secret
+     *
+     * @param PrivateKey|EC $private
+     * @param PublicKey|BigInteger|string $public
+     * @return mixed
+     */
+    public static function computeSecret($private, $public)
+    {
+        if ($private instanceof PrivateKey) { // DH\PrivateKey
+            switch (true) {
+                case $public instanceof PublicKey:
+                    if (!$private->prime->equals($public->prime) || !$private->base->equals($public->base)) {
+                        throw new \InvalidArgumentException('The public and private key do not share the same prime and / or base numbers');
+                    }
+                    return $public->publicKey->powMod($private->privateKey, $private->prime)->toBytes(true);
+                case is_string($public):
+                    $public = new BigInteger($public, -256);
+                    // fall-through
+                case $public instanceof BigInteger:
+                    return $public->powMod($private->privateKey, $private->prime)->toBytes(true);
+                default:
+                    throw new \InvalidArgumentException('$public needs to be an instance of DH\PublicKey, a BigInteger or a string');
+            }
+        }
+
+        if ($private instanceof EC\PrivateKey) {
+            switch (true) {
+                case $public instanceof EC\PublicKey:
+                    $public = $public->getEncodedCoordinates();
+                    // fall-through
+                case is_string($public):
+                    $point = $private->multiply($public);
+                    switch ($private->getCurve()) {
+                        case 'Curve25519':
+                        case 'Curve448':
+                            $secret = $point;
+                            break;
+                        default:
+                            // according to https://www.secg.org/sec1-v2.pdf#page=33 only X is returned
+                            $secret = substr($point, 1, (strlen($point) - 1) >> 1);
+                    }
+                    /*
+                    if (($secret[0] & "\x80") === "\x80") {
+                        $secret = "\0$secret";
+                    }
+                    */
+                    return $secret;
+                default:
+                    throw new \InvalidArgumentException('$public needs to be an instance of EC\PublicKey or a string (an encoded coordinate)');
+            }
+        }
+    }
+
+    /**
+     * Load the key
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return AsymmetricKey
+     */
+    public static function load($key, $password = false)
+    {
+        try {
+            return EC::load($key, $password);
+        } catch (NoKeyLoadedException $e) {
+        }
+
+        return parent::load($key, $password);
+    }
+
+    /**
+     * OnLoad Handler
+     *
+     * @return bool
+     */
+    protected static function onLoad(array $components)
+    {
+        if (!isset($components['privateKey']) && !isset($components['publicKey'])) {
+            $new = new Parameters();
+        } else {
+            $new = isset($components['privateKey']) ?
+                new PrivateKey() :
+                new PublicKey();
+        }
+
+        $new->prime = $components['prime'];
+        $new->base = $components['base'];
+
+        if (isset($components['privateKey'])) {
+            $new->privateKey = $components['privateKey'];
+        }
+        if (isset($components['publicKey'])) {
+            $new->publicKey = $components['publicKey'];
+        }
+
+        return $new;
+    }
+
+    /**
+     * Determines which hashing function should be used
+     *
+     * @param string $hash
+     */
+    public function withHash($hash)
+    {
+        throw new UnsupportedOperationException('DH does not use a hash algorithm');
+    }
+
+    /**
+     * Returns the hash algorithm currently being used
+     *
+     */
+    public function getHash()
+    {
+        throw new UnsupportedOperationException('DH does not use a hash algorithm');
+    }
+
+    /**
+     * Returns the parameters
+     *
+     * A public / private key is only returned if the currently loaded "key" contains an x or y
+     * value.
+     *
+     * @see self::getPublicKey()
+     * @return mixed
+     */
+    public function getParameters()
+    {
+        $type = DH::validatePlugin('Keys', 'PKCS1', 'saveParameters');
+
+        $key = $type::saveParameters($this->prime, $this->base);
+        return DH::load($key, 'PKCS1');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * "PKCS1" Formatted EC Key Handler
+ *
+ * PHP version 5
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN DH PARAMETERS-----
+ *
+ * Technically, PKCS1 is for RSA keys, only, but we're using PKCS1 to describe
+ * DSA, whose format isn't really formally described anywhere, so might as well
+ * use it to describe this, too.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DH\Formats\Keys;
+
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS1 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * "PKCS1" Formatted DH Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS1 extends Progenitor
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        $decoded = ASN1::decodeBER($key);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        $components = ASN1::asn1map($decoded[0], Maps\DHParameter::MAP);
+        if (!is_array($components)) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping on parameters');
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert EC parameters to the appropriate format
+     *
+     * @return string
+     */
+    public static function saveParameters(BigInteger $prime, BigInteger $base, array $options = [])
+    {
+        $params = [
+            'prime' => $prime,
+            'base' => $base
+        ];
+        $params = ASN1::encodeDER($params, Maps\DHParameter::MAP);
+
+        return "-----BEGIN DH PARAMETERS-----\r\n" .
+               chunk_split(base64_encode($params), 64) .
+               "-----END DH PARAMETERS-----\r\n";
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,132 @@
+<?php
+
+/**
+ * PKCS#8 Formatted DH Key Handler
+ *
+ * PHP version 5
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DH\Formats\Keys;
+
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#8 Formatted DH Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS8 extends Progenitor
+{
+    /**
+     * OID Name
+     *
+     * @var string
+     */
+    const OID_NAME = 'dhKeyAgreement';
+
+    /**
+     * OID Value
+     *
+     * @var string
+     */
+    const OID_VALUE = '1.2.840.113549.1.3.1';
+
+    /**
+     * Child OIDs loaded
+     *
+     * @var bool
+     */
+    protected static $childOIDsLoaded = false;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
+
+        $decoded = ASN1::decodeBER($key[$type . 'Algorithm']['parameters']->element);
+        if (empty($decoded)) {
+            throw new \RuntimeException('Unable to decode BER of parameters');
+        }
+        $components = ASN1::asn1map($decoded[0], Maps\DHParameter::MAP);
+        if (!is_array($components)) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping on parameters');
+        }
+
+        $decoded = ASN1::decodeBER($key[$type]);
+        switch (true) {
+            case !isset($decoded):
+            case !isset($decoded[0]['content']):
+            case !$decoded[0]['content'] instanceof BigInteger:
+                throw new \RuntimeException('Unable to decode BER of parameters');
+        }
+        $components[$type] = $decoded[0]['content'];
+
+        return $components;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $prime
+     * @param BigInteger $base
+     * @param BigInteger $privateKey
+     * @param BigInteger $publicKey
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $prime, BigInteger $base, BigInteger $privateKey, BigInteger $publicKey, $password = '', array $options = [])
+    {
+        $params = [
+            'prime' => $prime,
+            'base' => $base
+        ];
+        $params = ASN1::encodeDER($params, Maps\DHParameter::MAP);
+        $params = new ASN1\Element($params);
+        $key = ASN1::encodeDER($privateKey, ['type' => ASN1::TYPE_INTEGER]);
+        return self::wrapPrivateKey($key, [], $params, $password, null, '', $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $prime
+     * @param BigInteger $base
+     * @param BigInteger $publicKey
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $prime, BigInteger $base, BigInteger $publicKey, array $options = [])
+    {
+        $params = [
+            'prime' => $prime,
+            'base' => $base
+        ];
+        $params = ASN1::encodeDER($params, Maps\DHParameter::MAP);
+        $params = new ASN1\Element($params);
+        $key = ASN1::encodeDER($publicKey, ['type' => ASN1::TYPE_INTEGER]);
+        return self::wrapPublicKey($key, $params);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Parameters.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * DH Parameters
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DH;
+
+use phpseclib3\Crypt\DH;
+
+/**
+ * DH Parameters
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class Parameters extends DH
+{
+    /**
+     * Returns the parameters
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type = 'PKCS1', array $options = [])
+    {
+        $type = self::validatePlugin('Keys', 'PKCS1', 'saveParameters');
+
+        return $type::saveParameters($this->prime, $this->base, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * DH Private Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DH;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\DH;
+
+/**
+ * DH Private Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PrivateKey extends DH
+{
+    use Common\Traits\PasswordProtected;
+
+    /**
+     * Private Key
+     *
+     * @var \phpseclib3\Math\BigInteger
+     */
+    protected $privateKey;
+
+    /**
+     * Public Key
+     *
+     * @var \phpseclib3\Math\BigInteger
+     */
+    protected $publicKey;
+
+    /**
+     * Returns the public key
+     *
+     * @return PublicKey
+     */
+    public function getPublicKey()
+    {
+        $type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey');
+
+        if (!isset($this->publicKey)) {
+            $this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
+        }
+
+        $key = $type::savePublicKey($this->prime, $this->base, $this->publicKey);
+
+        return DH::loadFormat('PKCS8', $key);
+    }
+
+    /**
+     * Returns the private key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePrivateKey');
+
+        if (!isset($this->publicKey)) {
+            $this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
+        }
+
+        return $type::savePrivateKey($this->prime, $this->base, $this->privateKey, $this->publicKey, $this->password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DH/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * DH Public Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DH;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\DH;
+
+/**
+ * DH Public Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PublicKey extends DH
+{
+    use Common\Traits\Fingerprint;
+
+    /**
+     * Returns the public key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePublicKey');
+
+        return $type::savePublicKey($this->prime, $this->base, $this->publicKey, $options);
+    }
+
+    /**
+     * Returns the public key as a BigInteger
+     *
+     * @return \phpseclib3\Math\BigInteger
+     */
+    public function toBigInteger()
+    {
+        return $this->publicKey;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,337 @@
+<?php
+
+/**
+ * Pure-PHP FIPS 186-4 compliant implementation of DSA.
+ *
+ * PHP version 5
+ *
+ * Here's an example of how to create signatures and verify signatures with this library:
+ * <code>
+ * <?php
+ * include 'vendor/autoload.php';
+ *
+ * $private = \phpseclib3\Crypt\DSA::createKey();
+ * $public = $private->getPublicKey();
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $signature = $private->sign($plaintext);
+ *
+ * echo $public->verify($plaintext, $signature) ? 'verified' : 'unverified';
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\DSA\Parameters;
+use phpseclib3\Crypt\DSA\PrivateKey;
+use phpseclib3\Crypt\DSA\PublicKey;
+use phpseclib3\Exception\InsufficientSetupException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP FIPS 186-4 compliant implementation of DSA.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DSA extends AsymmetricKey
+{
+    /**
+     * Algorithm Name
+     *
+     * @var string
+     */
+    const ALGORITHM = 'DSA';
+
+    /**
+     * DSA Prime P
+     *
+     * @var BigInteger
+     */
+    protected $p;
+
+    /**
+     * DSA Group Order q
+     *
+     * Prime divisor of p-1
+     *
+     * @var BigInteger
+     */
+    protected $q;
+
+    /**
+     * DSA Group Generator G
+     *
+     * @var BigInteger
+     */
+    protected $g;
+
+    /**
+     * DSA public key value y
+     *
+     * @var BigInteger
+     */
+    protected $y;
+
+    /**
+     * Signature Format
+     *
+     * @var string
+     */
+    protected $sigFormat;
+
+    /**
+     * Signature Format (Short)
+     *
+     * @var string
+     */
+    protected $shortFormat;
+
+    /**
+     * Create DSA parameters
+     *
+     * @param int $L
+     * @param int $N
+     * @return DSA|bool
+     */
+    public static function createParameters($L = 2048, $N = 224)
+    {
+        self::initialize_static_variables();
+
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createParameters() should not be called from final classes (' . static::class . ')');
+        }
+
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+
+        switch (true) {
+            case $N == 160:
+            /*
+              in FIPS 186-1 and 186-2 N was fixed at 160 whereas K had an upper bound of 1024.
+              RFC 4253 (SSH Transport Layer Protocol) references FIPS 186-2 and as such most
+              SSH DSA implementations only support keys with an N of 160.
+              puttygen let's you set the size of L (but not the size of N) and uses 2048 as the
+              default L value. that's not really compliant with any of the FIPS standards, however,
+              for the purposes of maintaining compatibility with puttygen, we'll support it
+            */
+            //case ($L >= 512 || $L <= 1024) && (($L & 0x3F) == 0) && $N == 160:
+            // FIPS 186-3 changed this as follows:
+            //case $L == 1024 && $N == 160:
+            case $L == 2048 && $N == 224:
+            case $L == 2048 && $N == 256:
+            case $L == 3072 && $N == 256:
+                break;
+            default:
+                throw new \InvalidArgumentException('Invalid values for N and L');
+        }
+
+        $two = new BigInteger(2);
+
+        $q = BigInteger::randomPrime($N);
+        $divisor = $q->multiply($two);
+
+        do {
+            $x = BigInteger::random($L);
+            list(, $c) = $x->divide($divisor);
+            $p = $x->subtract($c->subtract(self::$one));
+        } while ($p->getLength() != $L || !$p->isPrime());
+
+        $p_1 = $p->subtract(self::$one);
+        list($e) = $p_1->divide($q);
+
+        // quoting http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf#page=50 ,
+        // "h could be obtained from a random number generator or from a counter that
+        //  changes after each use". PuTTY (sshdssg.c) starts h off at 1 and increments
+        // it on each loop. wikipedia says "commonly h = 2 is used" so we'll just do that
+        $h = clone $two;
+        while (true) {
+            $g = $h->powMod($e, $p);
+            if (!$g->equals(self::$one)) {
+                break;
+            }
+            $h = $h->add(self::$one);
+        }
+
+        $dsa = new Parameters();
+        $dsa->p = $p;
+        $dsa->q = $q;
+        $dsa->g = $g;
+
+        return $dsa;
+    }
+
+    /**
+     * Create public / private key pair.
+     *
+     * This method is a bit polymorphic. It can take a DSA/Parameters object, L / N as two distinct parameters or
+     * no parameters (at which point L and N will be generated with this method)
+     *
+     * Returns the private key, from which the publickey can be extracted
+     *
+     * @param int[] ...$args
+     * @return PrivateKey
+     */
+    public static function createKey(...$args)
+    {
+        self::initialize_static_variables();
+
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createKey() should not be called from final classes (' . static::class . ')');
+        }
+
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+
+        if (count($args) == 2 && is_int($args[0]) && is_int($args[1])) {
+            $params = self::createParameters($args[0], $args[1]);
+        } elseif (count($args) == 1 && $args[0] instanceof Parameters) {
+            $params = $args[0];
+        } elseif (!count($args)) {
+            $params = self::createParameters();
+        } else {
+            throw new InsufficientSetupException('Valid parameters are either two integers (L and N), a single DSA object or no parameters at all.');
+        }
+
+        $private = new PrivateKey();
+        $private->p = $params->p;
+        $private->q = $params->q;
+        $private->g = $params->g;
+
+        $private->x = BigInteger::randomRange(self::$one, $private->q->subtract(self::$one));
+        $private->y = $private->g->powMod($private->x, $private->p);
+
+        //$public = clone $private;
+        //unset($public->x);
+
+        return $private
+            ->withHash($params->hash->getHash())
+            ->withSignatureFormat($params->shortFormat);
+    }
+
+    /**
+     * OnLoad Handler
+     *
+     * @return bool
+     */
+    protected static function onLoad(array $components)
+    {
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+
+        if (!isset($components['x']) && !isset($components['y'])) {
+            $new = new Parameters();
+        } elseif (isset($components['x'])) {
+            $new = new PrivateKey();
+            $new->x = $components['x'];
+        } else {
+            $new = new PublicKey();
+        }
+
+        $new->p = $components['p'];
+        $new->q = $components['q'];
+        $new->g = $components['g'];
+
+        if (isset($components['y'])) {
+            $new->y = $components['y'];
+        }
+
+        return $new;
+    }
+
+    /**
+     * Constructor
+     *
+     * PublicKey and PrivateKey objects can only be created from abstract RSA class
+     */
+    protected function __construct()
+    {
+        $this->sigFormat = self::validatePlugin('Signature', 'ASN1');
+        $this->shortFormat = 'ASN1';
+
+        parent::__construct();
+    }
+
+    /**
+     * Returns the key size
+     *
+     * More specifically, this L (the length of DSA Prime P) and N (the length of DSA Group Order q)
+     *
+     * @return array
+     */
+    public function getLength()
+    {
+        return ['L' => $this->p->getLength(), 'N' => $this->q->getLength()];
+    }
+
+    /**
+     * Returns the current engine being used
+     *
+     * @see self::useInternalEngine()
+     * @see self::useBestEngine()
+     * @return string
+     */
+    public function getEngine()
+    {
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+        return self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods()) ?
+            'OpenSSL' : 'PHP';
+    }
+
+    /**
+     * Returns the parameters
+     *
+     * A public / private key is only returned if the currently loaded "key" contains an x or y
+     * value.
+     *
+     * @see self::getPublicKey()
+     * @return mixed
+     */
+    public function getParameters()
+    {
+        $type = self::validatePlugin('Keys', 'PKCS1', 'saveParameters');
+
+        $key = $type::saveParameters($this->p, $this->q, $this->g);
+        return DSA::load($key, 'PKCS1')
+            ->withHash($this->hash->getHash())
+            ->withSignatureFormat($this->shortFormat);
+    }
+
+    /**
+     * Determines the signature padding mode
+     *
+     * Valid values are: ASN1, SSH2, Raw
+     *
+     * @param string $format
+     */
+    public function withSignatureFormat($format)
+    {
+        $new = clone $this;
+        $new->shortFormat = $format;
+        $new->sigFormat = self::validatePlugin('Signature', $format);
+        return $new;
+    }
+
+    /**
+     * Returns the signature format currently being used
+     *
+     */
+    public function getSignatureFormat()
+    {
+        return $this->shortFormat;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/OpenSSH.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * OpenSSH Formatted DSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\OpenSSH as Progenitor;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * OpenSSH Formatted DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSH extends Progenitor
+{
+    /**
+     * Supported Key Types
+     *
+     * @var array
+     */
+    protected static $types = ['ssh-dss'];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $parsed = parent::load($key, $password);
+
+        if (isset($parsed['paddedKey'])) {
+            list($type) = Strings::unpackSSH2('s', $parsed['paddedKey']);
+            if ($type != $parsed['type']) {
+                throw new \RuntimeException("The public and private keys are not of the same type ($type vs $parsed[type])");
+            }
+
+            list($p, $q, $g, $y, $x, $comment) = Strings::unpackSSH2('i5s', $parsed['paddedKey']);
+
+            return compact('p', 'q', 'g', 'y', 'x', 'comment');
+        }
+
+        list($p, $q, $g, $y) = Strings::unpackSSH2('iiii', $parsed['publicKey']);
+
+        $comment = $parsed['comment'];
+
+        return compact('p', 'q', 'g', 'y', 'comment');
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, array $options = [])
+    {
+        if ($q->getLength() != 160) {
+            throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
+        }
+
+        // from <http://tools.ietf.org/html/rfc4253#page-15>:
+        // string    "ssh-dss"
+        // mpint     p
+        // mpint     q
+        // mpint     g
+        // mpint     y
+        $DSAPublicKey = Strings::packSSH2('siiii', 'ssh-dss', $p, $q, $g, $y);
+
+        if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+            return $DSAPublicKey;
+        }
+
+        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;
+        $DSAPublicKey = 'ssh-dss ' . base64_encode($DSAPublicKey) . ' ' . $comment;
+
+        return $DSAPublicKey;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param BigInteger $x
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '', array $options = [])
+    {
+        $publicKey = self::savePublicKey($p, $q, $g, $y, ['binary' => true]);
+        $privateKey = Strings::packSSH2('si5', 'ssh-dss', $p, $q, $g, $y, $x);
+
+        return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,143 @@
+<?php
+
+/**
+ * PKCS#1 Formatted DSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by File/X509.php
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN DSA PRIVATE KEY-----
+ * -----BEGIN DSA PUBLIC KEY-----
+ * -----BEGIN DSA PARAMETERS-----
+ *
+ * Analogous to ssh-keygen's pem format (as specified by -m)
+ *
+ * Also, technically, PKCS1 decribes RSA but I am not aware of a formal specification for DSA.
+ * The DSA private key format seems to have been adapted from the RSA private key format so
+ * we're just re-using that as the name.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS1 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#1 Formatted DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS1 extends Progenitor
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        $decoded = ASN1::decodeBER($key);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\DSAParams::MAP);
+        if (is_array($key)) {
+            return $key;
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\DSAPrivateKey::MAP);
+        if (is_array($key)) {
+            return $key;
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\DSAPublicKey::MAP);
+        if (is_array($key)) {
+            return $key;
+        }
+
+        throw new \RuntimeException('Unable to perform ASN1 mapping');
+    }
+
+    /**
+     * Convert DSA parameters to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @return string
+     */
+    public static function saveParameters(BigInteger $p, BigInteger $q, BigInteger $g)
+    {
+        $key = [
+            'p' => $p,
+            'q' => $q,
+            'g' => $g
+        ];
+
+        $key = ASN1::encodeDER($key, Maps\DSAParams::MAP);
+
+        return "-----BEGIN DSA PARAMETERS-----\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               "-----END DSA PARAMETERS-----\r\n";
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param BigInteger $x
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '', array $options = [])
+    {
+        $key = [
+            'version' => 0,
+            'p' => $p,
+            'q' => $q,
+            'g' => $g,
+            'y' => $y,
+            'x' => $x
+        ];
+
+        $key = ASN1::encodeDER($key, Maps\DSAPrivateKey::MAP);
+
+        return self::wrapPrivateKey($key, 'DSA', $password, $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
+    {
+        $key = ASN1::encodeDER($y, Maps\DSAPublicKey::MAP);
+
+        return self::wrapPublicKey($key, 'DSA');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,146 @@
+<?php
+
+/**
+ * PKCS#8 Formatted DSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
+ * is specific to private keys it's basically creating a DER-encoded wrapper
+ * for keys. This just extends that same concept to public keys (much like ssh-keygen)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#8 Formatted DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS8 extends Progenitor
+{
+    /**
+     * OID Name
+     *
+     * @var string
+     */
+    const OID_NAME = 'id-dsa';
+
+    /**
+     * OID Value
+     *
+     * @var string
+     */
+    const OID_VALUE = '1.2.840.10040.4.1';
+
+    /**
+     * Child OIDs loaded
+     *
+     * @var bool
+     */
+    protected static $childOIDsLoaded = false;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
+
+        $decoded = ASN1::decodeBER($key[$type . 'Algorithm']['parameters']->element);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER of parameters');
+        }
+        $components = ASN1::asn1map($decoded[0], Maps\DSAParams::MAP);
+        if (!is_array($components)) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping on parameters');
+        }
+
+        $decoded = ASN1::decodeBER($key[$type]);
+        if (empty($decoded)) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        $var = $type == 'privateKey' ? 'x' : 'y';
+        $components[$var] = ASN1::asn1map($decoded[0], Maps\DSAPublicKey::MAP);
+        if (!$components[$var] instanceof BigInteger) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping');
+        }
+
+        if (isset($key['meta'])) {
+            $components['meta'] = $key['meta'];
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param BigInteger $x
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '', array $options = [])
+    {
+        $params = [
+            'p' => $p,
+            'q' => $q,
+            'g' => $g
+        ];
+        $params = ASN1::encodeDER($params, Maps\DSAParams::MAP);
+        $params = new ASN1\Element($params);
+        $key = ASN1::encodeDER($x, Maps\DSAPublicKey::MAP);
+        return self::wrapPrivateKey($key, [], $params, $password, null, '', $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, array $options = [])
+    {
+        $params = [
+            'p' => $p,
+            'q' => $q,
+            'g' => $g
+        ];
+        $params = ASN1::encodeDER($params, Maps\DSAParams::MAP);
+        $params = new ASN1\Element($params);
+        $key = ASN1::encodeDER($y, Maps\DSAPublicKey::MAP);
+        return self::wrapPublicKey($key, $params);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PuTTY.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,109 @@
+<?php
+
+/**
+ * PuTTY Formatted DSA Key Handler
+ *
+ * puttygen does not generate DSA keys with an N of anything other than 160, however,
+ * it can still load them and convert them. PuTTY will load them, too, but SSH servers
+ * won't accept them. Since PuTTY formatted keys are primarily used with SSH this makes
+ * keys with N > 160 kinda useless, hence this handlers not supporting such keys.
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PuTTY Formatted DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PuTTY extends Progenitor
+{
+    /**
+     * Public Handler
+     *
+     * @var string
+     */
+    const PUBLIC_HANDLER = 'phpseclib3\Crypt\DSA\Formats\Keys\OpenSSH';
+
+    /**
+     * Algorithm Identifier
+     *
+     * @var array
+     */
+    protected static $types = ['ssh-dss'];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $components = parent::load($key, $password);
+        if (!isset($components['private'])) {
+            return $components;
+        }
+        extract($components);
+        unset($components['public'], $components['private']);
+
+        list($p, $q, $g, $y) = Strings::unpackSSH2('iiii', $public);
+        list($x) = Strings::unpackSSH2('i', $private);
+
+        return compact('p', 'q', 'g', 'y', 'x', 'comment');
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param BigInteger $x
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = false, array $options = [])
+    {
+        if ($q->getLength() != 160) {
+            throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
+        }
+
+        $public = Strings::packSSH2('iiii', $p, $q, $g, $y);
+        $private = Strings::packSSH2('i', $x);
+
+        return self::wrapPrivateKey($public, $private, 'ssh-dss', $password, $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
+    {
+        if ($q->getLength() != 160) {
+            throw new \InvalidArgumentException('SSH only supports keys with an N (length of Group Order q) of 160');
+        }
+
+        return self::wrapPublicKey(Strings::packSSH2('iiii', $p, $q, $g, $y), 'ssh-dss');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/Raw.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * Raw DSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Reads and creates arrays as DSA keys
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Raw DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Raw
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param array $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!is_array($key)) {
+            throw new \UnexpectedValueException('Key should be a array - not a ' . gettype($key));
+        }
+
+        switch (true) {
+            case !isset($key['p']) || !isset($key['q']) || !isset($key['g']):
+            case !$key['p'] instanceof BigInteger:
+            case !$key['q'] instanceof BigInteger:
+            case !$key['g'] instanceof BigInteger:
+            case !isset($key['x']) && !isset($key['y']):
+            case isset($key['x']) && !$key['x'] instanceof BigInteger:
+            case isset($key['y']) && !$key['y'] instanceof BigInteger:
+                throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        $options = ['p' => 1, 'q' => 1, 'g' => 1, 'x' => 1, 'y' => 1];
+
+        return array_intersect_key($key, $options);
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @param BigInteger $x
+     * @param string $password optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '')
+    {
+        return compact('p', 'q', 'g', 'y', 'x');
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
+    {
+        return compact('p', 'q', 'g', 'y');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/XML.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,132 @@
+<?php
+
+/**
+ * XML Formatted DSA Key Handler
+ *
+ * While XKMS defines a private key format for RSA it does not do so for DSA. Quoting that standard:
+ *
+ * "[XKMS] does not specify private key parameters for the DSA signature algorithm since the algorithm only
+ *  supports signature modes and so the application of server generated keys and key recovery is of limited
+ *  value"
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * XML Formatted DSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class XML
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (!class_exists('DOMDocument')) {
+            throw new BadConfigurationException('The dom extension is not setup correctly on this system');
+        }
+
+        $use_errors = libxml_use_internal_errors(true);
+
+        $dom = new \DOMDocument();
+        if (substr($key, 0, 5) != '<?xml') {
+            $key = '<xml>' . $key . '</xml>';
+        }
+        if (!$dom->loadXML($key)) {
+            libxml_use_internal_errors($use_errors);
+            throw new \UnexpectedValueException('Key does not appear to contain XML');
+        }
+        $xpath = new \DOMXPath($dom);
+        $keys = ['p', 'q', 'g', 'y', 'j', 'seed', 'pgencounter'];
+        foreach ($keys as $key) {
+            // $dom->getElementsByTagName($key) is case-sensitive
+            $temp = $xpath->query("//*[translate(local-name(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz')='$key']");
+            if (!$temp->length) {
+                continue;
+            }
+            $value = new BigInteger(Strings::base64_decode($temp->item(0)->nodeValue), 256);
+            switch ($key) {
+                case 'p': // a prime modulus meeting the [DSS] requirements
+                    // Parameters P, Q, and G can be public and common to a group of users. They might be known
+                    // from application context. As such, they are optional but P and Q must either both appear
+                    // or both be absent
+                    $components['p'] = $value;
+                    break;
+                case 'q': // an integer in the range 2**159 < Q < 2**160 which is a prime divisor of P-1
+                    $components['q'] = $value;
+                    break;
+                case 'g': // an integer with certain properties with respect to P and Q
+                    $components['g'] = $value;
+                    break;
+                case 'y': // G**X mod P (where X is part of the private key and not made public)
+                    $components['y'] = $value;
+                    // the remaining options do not do anything
+                case 'j': // (P - 1) / Q
+                    // Parameter J is available for inclusion solely for efficiency as it is calculatable from
+                    // P and Q
+                case 'seed': // a DSA prime generation seed
+                    // Parameters seed and pgenCounter are used in the DSA prime number generation algorithm
+                    // specified in [DSS]. As such, they are optional but must either both be present or both
+                    // be absent
+                case 'pgencounter': // a DSA prime generation counter
+            }
+        }
+
+        libxml_use_internal_errors($use_errors);
+
+        if (!isset($components['y'])) {
+            throw new \UnexpectedValueException('Key is missing y component');
+        }
+
+        switch (true) {
+            case !isset($components['p']):
+            case !isset($components['q']):
+            case !isset($components['g']):
+                return ['y' => $components['y']];
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * See https://www.w3.org/TR/xmldsig-core/#sec-DSAKeyValue
+     *
+     * @param BigInteger $p
+     * @param BigInteger $q
+     * @param BigInteger $g
+     * @param BigInteger $y
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
+    {
+        return "<DSAKeyValue>\r\n" .
+               '  <P>' . Strings::base64_encode($p->toBytes()) . "</P>\r\n" .
+               '  <Q>' . Strings::base64_encode($q->toBytes()) . "</Q>\r\n" .
+               '  <G>' . Strings::base64_encode($g->toBytes()) . "</G>\r\n" .
+               '  <Y>' . Strings::base64_encode($y->toBytes()) . "</Y>\r\n" .
+               '</DSAKeyValue>';
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/ASN1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * ASN1 Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures in the format described in
+ * https://tools.ietf.org/html/rfc3279#section-2.2.2
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Signature;
+
+use phpseclib3\File\ASN1 as Encoder;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * ASN1 Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ASN1
+{
+    /**
+     * Loads a signature
+     *
+     * @param string $sig
+     * @return array|bool
+     */
+    public static function load($sig)
+    {
+        if (!is_string($sig)) {
+            return false;
+        }
+
+        $decoded = Encoder::decodeBER($sig);
+        if (empty($decoded)) {
+            return false;
+        }
+        $components = Encoder::asn1map($decoded[0], Maps\DssSigValue::MAP);
+
+        return $components;
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s)
+    {
+        return Encoder::encodeDER(compact('r', 's'), Maps\DssSigValue::MAP);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/Raw.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Raw DSA Signature Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Signature;
+
+use phpseclib3\Crypt\Common\Formats\Signature\Raw as Progenitor;
+
+/**
+ * Raw DSA Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Raw extends Progenitor
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/SSH2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Formats/Signature/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * SSH2 Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures in the format used by SSH2
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA\Formats\Signature;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * SSH2 Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SSH2
+{
+    /**
+     * Loads a signature
+     *
+     * @param string $sig
+     * @return mixed
+     */
+    public static function load($sig)
+    {
+        if (!is_string($sig)) {
+            return false;
+        }
+
+        $result = Strings::unpackSSH2('ss', $sig);
+        if ($result === false) {
+            return false;
+        }
+        list($type, $blob) = $result;
+        if ($type != 'ssh-dss' || strlen($blob) != 40) {
+            return false;
+        }
+
+        return [
+            'r' => new BigInteger(substr($blob, 0, 20), 256),
+            's' => new BigInteger(substr($blob, 20), 256)
+        ];
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s)
+    {
+        if ($r->getLength() > 160 || $s->getLength() > 160) {
+            return false;
+        }
+        return Strings::packSSH2(
+            'ss',
+            'ssh-dss',
+            str_pad($r->toBytes(), 20, "\0", STR_PAD_LEFT) .
+            str_pad($s->toBytes(), 20, "\0", STR_PAD_LEFT)
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Parameters.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * DSA Parameters
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA;
+
+use phpseclib3\Crypt\DSA;
+
+/**
+ * DSA Parameters
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class Parameters extends DSA
+{
+    /**
+     * Returns the parameters
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type = 'PKCS1', array $options = [])
+    {
+        $type = self::validatePlugin('Keys', 'PKCS1', 'saveParameters');
+
+        return $type::saveParameters($this->p, $this->q, $this->g, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,152 @@
+<?php
+
+/**
+ * DSA Private Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * DSA Private Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PrivateKey extends DSA implements Common\PrivateKey
+{
+    use Common\Traits\PasswordProtected;
+
+    /**
+     * DSA secret exponent x
+     *
+     * @var BigInteger
+     */
+    protected $x;
+
+    /**
+     * Returns the public key
+     *
+     * If you do "openssl rsa -in private.rsa -pubout -outform PEM" you get a PKCS8 formatted key
+     * that contains a publicKeyAlgorithm AlgorithmIdentifier and a publicKey BIT STRING.
+     * An AlgorithmIdentifier contains an OID and a parameters field. With RSA public keys this
+     * parameters field is NULL. With DSA PKCS8 public keys it is not - it contains the p, q and g
+     * variables. The publicKey BIT STRING contains, simply, the y variable. This can be verified
+     * by getting a DSA PKCS8 public key:
+     *
+     * "openssl dsa -in private.dsa -pubout -outform PEM"
+     *
+     * ie. just swap out rsa with dsa in the rsa command above.
+     *
+     * A PKCS1 public key corresponds to the publicKey portion of the PKCS8 key. In the case of RSA
+     * the publicKey portion /is/ the key. In the case of DSA it is not. You cannot verify a signature
+     * without the parameters and the PKCS1 DSA public key format does not include the parameters.
+     *
+     * @see self::getPrivateKey()
+     * @return mixed
+     */
+    public function getPublicKey()
+    {
+        $type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey');
+
+        if (!isset($this->y)) {
+            $this->y = $this->g->powMod($this->x, $this->p);
+        }
+
+        $key = $type::savePublicKey($this->p, $this->q, $this->g, $this->y);
+
+        return DSA::loadFormat('PKCS8', $key)
+            ->withHash($this->hash->getHash())
+            ->withSignatureFormat($this->shortFormat);
+    }
+
+    /**
+     * Create a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @return mixed
+     */
+    public function sign($message)
+    {
+        $format = $this->sigFormat;
+
+        if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
+            $signature = '';
+            $result = openssl_sign($message, $signature, $this->toString('PKCS8'), $this->hash->getHash());
+
+            if ($result) {
+                if ($this->shortFormat == 'ASN1') {
+                    return $signature;
+                }
+
+                extract(ASN1Signature::load($signature));
+
+                return $format::save($r, $s);
+            }
+        }
+
+        $h = $this->hash->hash($message);
+        $h = $this->bits2int($h);
+
+        while (true) {
+            $k = BigInteger::randomRange(self::$one, $this->q->subtract(self::$one));
+            $r = $this->g->powMod($k, $this->p);
+            list(, $r) = $r->divide($this->q);
+            if ($r->equals(self::$zero)) {
+                continue;
+            }
+            $kinv = $k->modInverse($this->q);
+            $temp = $h->add($this->x->multiply($r));
+            $temp = $kinv->multiply($temp);
+            list(, $s) = $temp->divide($this->q);
+            if (!$s->equals(self::$zero)) {
+                break;
+            }
+        }
+
+        // the following is an RFC6979 compliant implementation of deterministic DSA
+        // it's unused because it's mainly intended for use when a good CSPRNG isn't
+        // available. if phpseclib's CSPRNG isn't good then even key generation is
+        // suspect
+        /*
+        $h1 = $this->hash->hash($message);
+        $k = $this->computek($h1);
+        $r = $this->g->powMod($k, $this->p);
+        list(, $r) = $r->divide($this->q);
+        $kinv = $k->modInverse($this->q);
+        $h1 = $this->bits2int($h1);
+        $temp = $h1->add($this->x->multiply($r));
+        $temp = $kinv->multiply($temp);
+        list(, $s) = $temp->divide($this->q);
+        */
+
+        return $format::save($r, $s);
+    }
+
+    /**
+     * Returns the private key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePrivateKey');
+
+        if (!isset($this->y)) {
+            $this->y = $this->g->powMod($this->x, $this->p);
+        }
+
+        return $type::savePrivateKey($this->p, $this->q, $this->g, $this->y, $this->x, $this->password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,86 @@
+<?php
+
+/**
+ * DSA Public Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature;
+
+/**
+ * DSA Public Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PublicKey extends DSA implements Common\PublicKey
+{
+    use Common\Traits\Fingerprint;
+
+    /**
+     * Verify a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @param string $signature
+     * @return mixed
+     */
+    public function verify($message, $signature)
+    {
+        $format = $this->sigFormat;
+
+        $params = $format::load($signature);
+        if ($params === false || count($params) != 2) {
+            return false;
+        }
+        extract($params);
+
+        if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
+            $sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature;
+
+            $result = openssl_verify($message, $sig, $this->toString('PKCS8'), $this->hash->getHash());
+
+            if ($result != -1) {
+                return (bool) $result;
+            }
+        }
+
+        $q_1 = $this->q->subtract(self::$one);
+        if (!$r->between(self::$one, $q_1) || !$s->between(self::$one, $q_1)) {
+            return false;
+        }
+
+        $w = $s->modInverse($this->q);
+        $h = $this->hash->hash($message);
+        $h = $this->bits2int($h);
+        list(, $u1) = $h->multiply($w)->divide($this->q);
+        list(, $u2) = $r->multiply($w)->divide($this->q);
+        $v1 = $this->g->powMod($u1, $this->p);
+        $v2 = $this->y->powMod($u2, $this->p);
+        list(, $v) = $v1->multiply($v2)->divide($this->p);
+        list(, $v) = $v->divide($this->q);
+
+        return $v->equals($r);
+    }
+
+    /**
+     * Returns the public key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePublicKey');
+
+        return $type::savePublicKey($this->p, $this->q, $this->g, $this->y, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,480 @@
+<?php
+
+/**
+ * Pure-PHP implementation of EC.
+ *
+ * PHP version 5
+ *
+ * Here's an example of how to create signatures and verify signatures with this library:
+ * <code>
+ * <?php
+ * include 'vendor/autoload.php';
+ *
+ * $private = \phpseclib3\Crypt\EC::createKey('secp256k1');
+ * $public = $private->getPublicKey();
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $signature = $private->sign($plaintext);
+ *
+ * echo $public->verify($plaintext, $signature) ? 'verified' : 'unverified';
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Crypt\EC\Curves\Curve25519;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Crypt\EC\Curves\Ed448;
+use phpseclib3\Crypt\EC\Formats\Keys\PKCS1;
+use phpseclib3\Crypt\EC\Parameters;
+use phpseclib3\Crypt\EC\PrivateKey;
+use phpseclib3\Crypt\EC\PublicKey;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\Exception\UnsupportedOperationException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps\ECParameters;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP implementation of EC.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EC extends AsymmetricKey
+{
+    /**
+     * Algorithm Name
+     *
+     * @var string
+     */
+    const ALGORITHM = 'EC';
+
+    /**
+     * Public Key QA
+     *
+     * @var object[]
+     */
+    protected $QA;
+
+    /**
+     * Curve
+     *
+     * @var EC\BaseCurves\Base
+     */
+    protected $curve;
+
+    /**
+     * Signature Format
+     *
+     * @var string
+     */
+    protected $format;
+
+    /**
+     * Signature Format (Short)
+     *
+     * @var string
+     */
+    protected $shortFormat;
+
+    /**
+     * Curve Name
+     *
+     * @var string
+     */
+    private $curveName;
+
+    /**
+     * Curve Order
+     *
+     * Used for deterministic ECDSA
+     *
+     * @var BigInteger
+     */
+    protected $q;
+
+    /**
+     * Alias for the private key
+     *
+     * Used for deterministic ECDSA. AsymmetricKey expects $x. I don't like x because
+     * with x you have x * the base point yielding an (x, y)-coordinate that is the
+     * public key. But the x is different depending on which side of the equal sign
+     * you're on. It's less ambiguous if you do dA * base point = (x, y)-coordinate.
+     *
+     * @var BigInteger
+     */
+    protected $x;
+
+    /**
+     * Context
+     *
+     * @var string
+     */
+    protected $context;
+
+    /**
+     * Signature Format
+     *
+     * @var string
+     */
+    protected $sigFormat;
+
+    /**
+     * Create public / private key pair.
+     *
+     * @param string $curve
+     * @return PrivateKey
+     */
+    public static function createKey($curve)
+    {
+        self::initialize_static_variables();
+
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createKey() should not be called from final classes (' . static::class . ')');
+        }
+
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+
+        $curve = strtolower($curve);
+        if (self::$engines['libsodium'] && $curve == 'ed25519' && function_exists('sodium_crypto_sign_keypair')) {
+            $kp = sodium_crypto_sign_keypair();
+
+            $privatekey = EC::loadFormat('libsodium', sodium_crypto_sign_secretkey($kp));
+            //$publickey = EC::loadFormat('libsodium', sodium_crypto_sign_publickey($kp));
+
+            $privatekey->curveName = 'Ed25519';
+            //$publickey->curveName = $curve;
+
+            return $privatekey;
+        }
+
+        $privatekey = new PrivateKey();
+
+        $curveName = $curve;
+        if (preg_match('#(?:^curve|^ed)\d+$#', $curveName)) {
+            $curveName = ucfirst($curveName);
+        } elseif (substr($curveName, 0, 10) == 'brainpoolp') {
+            $curveName = 'brainpoolP' . substr($curveName, 10);
+        }
+        $curve = '\phpseclib3\Crypt\EC\Curves\\' . $curveName;
+
+        if (!class_exists($curve)) {
+            throw new UnsupportedCurveException('Named Curve of ' . $curveName . ' is not supported');
+        }
+
+        $reflect = new \ReflectionClass($curve);
+        $curveName = $reflect->isFinal() ?
+            $reflect->getParentClass()->getShortName() :
+            $reflect->getShortName();
+
+        $curve = new $curve();
+        if ($curve instanceof TwistedEdwardsCurve) {
+            $arr = $curve->extractSecret(Random::string($curve instanceof Ed448 ? 57 : 32));
+            $privatekey->dA = $dA = $arr['dA'];
+            $privatekey->secret = $arr['secret'];
+        } else {
+            $privatekey->dA = $dA = $curve->createRandomMultiplier();
+        }
+        if ($curve instanceof Curve25519 && self::$engines['libsodium']) {
+            //$r = pack('H*', '0900000000000000000000000000000000000000000000000000000000000000');
+            //$QA = sodium_crypto_scalarmult($dA->toBytes(), $r);
+            $QA = sodium_crypto_box_publickey_from_secretkey($dA->toBytes());
+            $privatekey->QA = [$curve->convertInteger(new BigInteger(strrev($QA), 256))];
+        } else {
+            $privatekey->QA = $curve->multiplyPoint($curve->getBasePoint(), $dA);
+        }
+        $privatekey->curve = $curve;
+
+        //$publickey = clone $privatekey;
+        //unset($publickey->dA);
+        //unset($publickey->x);
+
+        $privatekey->curveName = $curveName;
+        //$publickey->curveName = $curveName;
+
+        if ($privatekey->curve instanceof TwistedEdwardsCurve) {
+            return $privatekey->withHash($curve::HASH);
+        }
+
+        return $privatekey;
+    }
+
+    /**
+     * OnLoad Handler
+     *
+     * @return bool
+     */
+    protected static function onLoad(array $components)
+    {
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+
+        if (!isset($components['dA']) && !isset($components['QA'])) {
+            $new = new Parameters();
+            $new->curve = $components['curve'];
+            return $new;
+        }
+
+        $new = isset($components['dA']) ?
+            new PrivateKey() :
+            new PublicKey();
+        $new->curve = $components['curve'];
+        $new->QA = $components['QA'];
+
+        if (isset($components['dA'])) {
+            $new->dA = $components['dA'];
+            $new->secret = $components['secret'];
+        }
+
+        if ($new->curve instanceof TwistedEdwardsCurve) {
+            return $new->withHash($components['curve']::HASH);
+        }
+
+        return $new;
+    }
+
+    /**
+     * Constructor
+     *
+     * PublicKey and PrivateKey objects can only be created from abstract RSA class
+     */
+    protected function __construct()
+    {
+        $this->sigFormat = self::validatePlugin('Signature', 'ASN1');
+        $this->shortFormat = 'ASN1';
+
+        parent::__construct();
+    }
+
+    /**
+     * Returns the curve
+     *
+     * Returns a string if it's a named curve, an array if not
+     *
+     * @return string|array
+     */
+    public function getCurve()
+    {
+        if ($this->curveName) {
+            return $this->curveName;
+        }
+
+        if ($this->curve instanceof MontgomeryCurve) {
+            $this->curveName = $this->curve instanceof Curve25519 ? 'Curve25519' : 'Curve448';
+            return $this->curveName;
+        }
+
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            $this->curveName = $this->curve instanceof Ed25519 ? 'Ed25519' : 'Ed448';
+            return $this->curveName;
+        }
+
+        $params = $this->getParameters()->toString('PKCS8', ['namedCurve' => true]);
+        $decoded = ASN1::extractBER($params);
+        $decoded = ASN1::decodeBER($decoded);
+        $decoded = ASN1::asn1map($decoded[0], ECParameters::MAP);
+        if (isset($decoded['namedCurve'])) {
+            $this->curveName = $decoded['namedCurve'];
+            return $decoded['namedCurve'];
+        }
+
+        if (!$namedCurves) {
+            PKCS1::useSpecifiedCurve();
+        }
+
+        return $decoded;
+    }
+
+    /**
+     * Returns the key size
+     *
+     * Quoting https://tools.ietf.org/html/rfc5656#section-2,
+     *
+     * "The size of a set of elliptic curve domain parameters on a prime
+     *  curve is defined as the number of bits in the binary representation
+     *  of the field order, commonly denoted by p.  Size on a
+     *  characteristic-2 curve is defined as the number of bits in the binary
+     *  representation of the field, commonly denoted by m.  A set of
+     *  elliptic curve domain parameters defines a group of order n generated
+     *  by a base point P"
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return $this->curve->getLength();
+    }
+
+    /**
+     * Returns the current engine being used
+     *
+     * @see self::useInternalEngine()
+     * @see self::useBestEngine()
+     * @return string
+     */
+    public function getEngine()
+    {
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            return $this->curve instanceof Ed25519 && self::$engines['libsodium'] && !isset($this->context) ?
+                'libsodium' : 'PHP';
+        }
+
+        return self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods()) ?
+            'OpenSSL' : 'PHP';
+    }
+
+    /**
+     * Returns the public key coordinates as a string
+     *
+     * Used by ECDH
+     *
+     * @return string
+     */
+    public function getEncodedCoordinates()
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            return strrev($this->QA[0]->toBytes(true));
+        }
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            return $this->curve->encodePoint($this->QA);
+        }
+        return "\4" . $this->QA[0]->toBytes(true) . $this->QA[1]->toBytes(true);
+    }
+
+    /**
+     * Returns the parameters
+     *
+     * @see self::getPublicKey()
+     * @param string $type optional
+     * @return mixed
+     */
+    public function getParameters($type = 'PKCS1')
+    {
+        $type = self::validatePlugin('Keys', $type, 'saveParameters');
+
+        $key = $type::saveParameters($this->curve);
+
+        return EC::load($key, 'PKCS1')
+            ->withHash($this->hash->getHash())
+            ->withSignatureFormat($this->shortFormat);
+    }
+
+    /**
+     * Determines the signature padding mode
+     *
+     * Valid values are: ASN1, SSH2, Raw
+     *
+     * @param string $format
+     */
+    public function withSignatureFormat($format)
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            throw new UnsupportedOperationException('Montgomery Curves cannot be used to create signatures');
+        }
+
+        $new = clone $this;
+        $new->shortFormat = $format;
+        $new->sigFormat = self::validatePlugin('Signature', $format);
+        return $new;
+    }
+
+    /**
+     * Returns the signature format currently being used
+     *
+     */
+    public function getSignatureFormat()
+    {
+        return $this->shortFormat;
+    }
+
+    /**
+     * Sets the context
+     *
+     * Used by Ed25519 / Ed448.
+     *
+     * @see self::sign()
+     * @see self::verify()
+     * @param string $context optional
+     */
+    public function withContext($context = null)
+    {
+        if (!$this->curve instanceof TwistedEdwardsCurve) {
+            throw new UnsupportedCurveException('Only Ed25519 and Ed448 support contexts');
+        }
+
+        $new = clone $this;
+        if (!isset($context)) {
+            $new->context = null;
+            return $new;
+        }
+        if (!is_string($context)) {
+            throw new \InvalidArgumentException('setContext expects a string');
+        }
+        if (strlen($context) > 255) {
+            throw new \LengthException('The context is supposed to be, at most, 255 bytes long');
+        }
+        $new->context = $context;
+        return $new;
+    }
+
+    /**
+     * Returns the signature format currently being used
+     *
+     */
+    public function getContext()
+    {
+        return $this->context;
+    }
+
+    /**
+     * Determines which hashing function should be used
+     *
+     * @param string $hash
+     */
+    public function withHash($hash)
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            throw new UnsupportedOperationException('Montgomery Curves cannot be used to create signatures');
+        }
+        if ($this->curve instanceof Ed25519 && $hash != 'sha512') {
+            throw new UnsupportedAlgorithmException('Ed25519 only supports sha512 as a hash');
+        }
+        if ($this->curve instanceof Ed448 && $hash != 'shake256-912') {
+            throw new UnsupportedAlgorithmException('Ed448 only supports shake256 with a length of 114 bytes');
+        }
+
+        return parent::withHash($hash);
+    }
+
+    /**
+     * __toString() magic method
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            return '';
+        }
+
+        return parent::__toString();
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Base.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,218 @@
+<?php
+
+/**
+ * Curve methods common to all curves
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Base
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Base
+{
+    /**
+     * The Order
+     *
+     * @var BigInteger
+     */
+    protected $order;
+
+    /**
+     * Finite Field Integer factory
+     *
+     * @var FiniteField\Integer
+     */
+    protected $factory;
+
+    /**
+     * Returns a random integer
+     *
+     * @return object
+     */
+    public function randomInteger()
+    {
+        return $this->factory->randomInteger();
+    }
+
+    /**
+     * Converts a BigInteger to a FiniteField\Integer integer
+     *
+     * @return object
+     */
+    public function convertInteger(BigInteger $x)
+    {
+        return $this->factory->newInteger($x);
+    }
+
+    /**
+     * Returns the length, in bytes, of the modulo
+     *
+     * @return integer
+     */
+    public function getLengthInBytes()
+    {
+        return $this->factory->getLengthInBytes();
+    }
+
+    /**
+     * Returns the length, in bits, of the modulo
+     *
+     * @return integer
+     */
+    public function getLength()
+    {
+        return $this->factory->getLength();
+    }
+
+    /**
+     * Multiply a point on the curve by a scalar
+     *
+     * Uses the montgomery ladder technique as described here:
+     *
+     * https://en.wikipedia.org/wiki/Elliptic_curve_point_multiplication#Montgomery_ladder
+     * https://github.com/phpecc/phpecc/issues/16#issuecomment-59176772
+     *
+     * @return array
+     */
+    public function multiplyPoint(array $p, BigInteger $d)
+    {
+        $alreadyInternal = isset($p[2]);
+        $r = $alreadyInternal ?
+            [[], $p] :
+            [[], $this->convertToInternal($p)];
+
+        $d = $d->toBits();
+        for ($i = 0; $i < strlen($d); $i++) {
+            $d_i = (int) $d[$i];
+            $r[1 - $d_i] = $this->addPoint($r[0], $r[1]);
+            $r[$d_i] = $this->doublePoint($r[$d_i]);
+        }
+
+        return $alreadyInternal ? $r[0] : $this->convertToAffine($r[0]);
+    }
+
+    /**
+     * Creates a random scalar multiplier
+     *
+     * @return BigInteger
+     */
+    public function createRandomMultiplier()
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        return BigInteger::randomRange($one, $this->order->subtract($one));
+    }
+
+    /**
+     * Performs range check
+     */
+    public function rangeCheck(BigInteger $x)
+    {
+        static $zero;
+        if (!isset($zero)) {
+            $zero = new BigInteger();
+        }
+
+        if (!isset($this->order)) {
+            throw new \RuntimeException('setOrder needs to be called before this method');
+        }
+        if ($x->compare($this->order) > 0 || $x->compare($zero) <= 0) {
+            throw new \RangeException('x must be between 1 and the order of the curve');
+        }
+    }
+
+    /**
+     * Sets the Order
+     */
+    public function setOrder(BigInteger $order)
+    {
+        $this->order = $order;
+    }
+
+    /**
+     * Returns the Order
+     *
+     * @return BigInteger
+     */
+    public function getOrder()
+    {
+        return $this->order;
+    }
+
+    /**
+     * Use a custom defined modular reduction function
+     *
+     * @return object
+     */
+    public function setReduction(callable $func)
+    {
+        $this->factory->setReduction($func);
+    }
+
+    /**
+     * Returns the affine point
+     *
+     * @return object[]
+     */
+    public function convertToAffine(array $p)
+    {
+        return $p;
+    }
+
+    /**
+     * Converts an affine point to a jacobian coordinate
+     *
+     * @return object[]
+     */
+    public function convertToInternal(array $p)
+    {
+        return $p;
+    }
+
+    /**
+     * Negates a point
+     *
+     * @return object[]
+     */
+    public function negatePoint(array $p)
+    {
+        $temp = [
+            $p[0],
+            $p[1]->negate()
+        ];
+        if (isset($p[2])) {
+            $temp[] = $p[2];
+        }
+        return $temp;
+    }
+
+    /**
+     * Multiply and Add Points
+     *
+     * @return int[]
+     */
+    public function multiplyAddPoints(array $points, array $scalars)
+    {
+        $p1 = $this->convertToInternal($points[0]);
+        $p2 = $this->convertToInternal($points[1]);
+        $p1 = $this->multiplyPoint($p1, $scalars[0]);
+        $p2 = $this->multiplyPoint($p2, $scalars[1]);
+        $r = $this->addPoint($p1, $p2);
+        return $this->convertToAffine($r);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Binary.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Binary.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Binary.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,373 @@
+<?php
+
+/**
+ * Curves over y^2 + x*y = x^3 + a*x^2 + b
+ *
+ * These are curves used in SEC 2 over prime fields: http://www.secg.org/SEC2-Ver-1.0.pdf
+ * The curve is a weierstrass curve with a[3] and a[2] set to 0.
+ *
+ * Uses Jacobian Coordinates for speed if able:
+ *
+ * https://en.wikipedia.org/wiki/Jacobian_curve
+ * https://en.wikibooks.org/wiki/Cryptography/Prime_Curve/Jacobian_Coordinates
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\BinaryField;
+use phpseclib3\Math\BinaryField\Integer as BinaryInteger;
+
+/**
+ * Curves over y^2 + x*y = x^3 + a*x^2 + b
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Binary extends Base
+{
+    /**
+     * Binary Field Integer factory
+     *
+     * @var BinaryField
+     */
+    protected $factory;
+
+    /**
+     * Cofficient for x^1
+     *
+     * @var object
+     */
+    protected $a;
+
+    /**
+     * Cofficient for x^0
+     *
+     * @var object
+     */
+    protected $b;
+
+    /**
+     * Base Point
+     *
+     * @var object
+     */
+    protected $p;
+
+    /**
+     * The number one over the specified finite field
+     *
+     * @var object
+     */
+    protected $one;
+
+    /**
+     * The modulo
+     *
+     * @var BigInteger
+     */
+    protected $modulo;
+
+    /**
+     * The Order
+     *
+     * @var BigInteger
+     */
+    protected $order;
+
+    /**
+     * Sets the modulo
+     */
+    public function setModulo(...$modulo)
+    {
+        $this->modulo = $modulo;
+        $this->factory = new BinaryField(...$modulo);
+
+        $this->one = $this->factory->newInteger("\1");
+    }
+
+    /**
+     * Set coefficients a and b
+     *
+     * @param string $a
+     * @param string $b
+     */
+    public function setCoefficients($a, $b)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->a = $this->factory->newInteger(pack('H*', $a));
+        $this->b = $this->factory->newInteger(pack('H*', $b));
+    }
+
+    /**
+     * Set x and y coordinates for the base point
+     *
+     * @param string|BinaryInteger $x
+     * @param string|BinaryInteger $y
+     */
+    public function setBasePoint($x, $y)
+    {
+        switch (true) {
+            case !is_string($x) && !$x instanceof BinaryInteger:
+                throw new \UnexpectedValueException('Argument 1 passed to Binary::setBasePoint() must be a string or an instance of BinaryField\Integer');
+            case !is_string($y) && !$y instanceof BinaryInteger:
+                throw new \UnexpectedValueException('Argument 2 passed to Binary::setBasePoint() must be a string or an instance of BinaryField\Integer');
+        }
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->p = [
+            is_string($x) ? $this->factory->newInteger(pack('H*', $x)) : $x,
+            is_string($y) ? $this->factory->newInteger(pack('H*', $y)) : $y
+        ];
+    }
+
+    /**
+     * Retrieve the base point as an array
+     *
+     * @return array
+     */
+    public function getBasePoint()
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        /*
+        if (!isset($this->p)) {
+            throw new \RuntimeException('setBasePoint needs to be called before this method');
+        }
+        */
+        return $this->p;
+    }
+
+    /**
+     * Adds two points on the curve
+     *
+     * @return FiniteField[]
+     */
+    public function addPoint(array $p, array $q)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p) || !count($q)) {
+            if (count($q)) {
+                return $q;
+            }
+            if (count($p)) {
+                return $p;
+            }
+            return [];
+        }
+
+        if (!isset($p[2]) || !isset($q[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        if ($p[0]->equals($q[0])) {
+            return !$p[1]->equals($q[1]) ? [] : $this->doublePoint($p);
+        }
+
+        // formulas from http://hyperelliptic.org/EFD/g12o/auto-shortw-jacobian.html
+
+        list($x1, $y1, $z1) = $p;
+        list($x2, $y2, $z2) = $q;
+
+        $o1 = $z1->multiply($z1);
+        $b = $x2->multiply($o1);
+
+        if ($z2->equals($this->one)) {
+            $d = $y2->multiply($o1)->multiply($z1);
+            $e = $x1->add($b);
+            $f = $y1->add($d);
+            $z3 = $e->multiply($z1);
+            $h = $f->multiply($x2)->add($z3->multiply($y2));
+            $i = $f->add($z3);
+            $g = $z3->multiply($z3);
+            $p1 = $this->a->multiply($g);
+            $p2 = $f->multiply($i);
+            $p3 = $e->multiply($e)->multiply($e);
+            $x3 = $p1->add($p2)->add($p3);
+            $y3 = $i->multiply($x3)->add($g->multiply($h));
+
+            return [$x3, $y3, $z3];
+        }
+
+        $o2 = $z2->multiply($z2);
+        $a = $x1->multiply($o2);
+        $c = $y1->multiply($o2)->multiply($z2);
+        $d = $y2->multiply($o1)->multiply($z1);
+        $e = $a->add($b);
+        $f = $c->add($d);
+        $g = $e->multiply($z1);
+        $h = $f->multiply($x2)->add($g->multiply($y2));
+        $z3 = $g->multiply($z2);
+        $i = $f->add($z3);
+        $p1 = $this->a->multiply($z3->multiply($z3));
+        $p2 = $f->multiply($i);
+        $p3 = $e->multiply($e)->multiply($e);
+        $x3 = $p1->add($p2)->add($p3);
+        $y3 = $i->multiply($x3)->add($g->multiply($g)->multiply($h));
+
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Doubles a point on a curve
+     *
+     * @return FiniteField[]
+     */
+    public function doublePoint(array $p)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p)) {
+            return [];
+        }
+
+        if (!isset($p[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        // formulas from http://hyperelliptic.org/EFD/g12o/auto-shortw-jacobian.html
+
+        list($x1, $y1, $z1) = $p;
+
+        $a = $x1->multiply($x1);
+        $b = $a->multiply($a);
+
+        if ($z1->equals($this->one)) {
+            $x3 = $b->add($this->b);
+            $z3 = clone $x1;
+            $p1 = $a->add($y1)->add($z3)->multiply($this->b);
+            $p2 = $a->add($y1)->multiply($b);
+            $y3 = $p1->add($p2);
+
+            return [$x3, $y3, $z3];
+        }
+
+        $c = $z1->multiply($z1);
+        $d = $c->multiply($c);
+        $x3 = $b->add($this->b->multiply($d->multiply($d)));
+        $z3 = $x1->multiply($c);
+        $p1 = $b->multiply($z3);
+        $p2 = $a->add($y1->multiply($z1))->add($z3)->multiply($x3);
+        $y3 = $p1->add($p2);
+
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Returns the X coordinate and the derived Y coordinate
+     *
+     * Not supported because it is covered by patents.
+     * Quoting https://www.openssl.org/docs/man1.1.0/apps/ecparam.html ,
+     *
+     * "Due to patent issues the compressed option is disabled by default for binary curves
+     *  and can be enabled by defining the preprocessor macro OPENSSL_EC_BIN_PT_COMP at
+     *  compile time."
+     *
+     * @return array
+     */
+    public function derivePoint($m)
+    {
+        throw new \RuntimeException('Point compression on binary finite field elliptic curves is not supported');
+    }
+
+    /**
+     * Tests whether or not the x / y values satisfy the equation
+     *
+     * @return boolean
+     */
+    public function verifyPoint(array $p)
+    {
+        list($x, $y) = $p;
+        $lhs = $y->multiply($y);
+        $lhs = $lhs->add($x->multiply($y));
+        $x2 = $x->multiply($x);
+        $x3 = $x2->multiply($x);
+        $rhs = $x3->add($this->a->multiply($x2))->add($this->b);
+
+        return $lhs->equals($rhs);
+    }
+
+    /**
+     * Returns the modulo
+     *
+     * @return BigInteger
+     */
+    public function getModulo()
+    {
+        return $this->modulo;
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer
+     */
+    public function getA()
+    {
+        return $this->a;
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer
+     */
+    public function getB()
+    {
+        return $this->b;
+    }
+
+    /**
+     * Returns the affine point
+     *
+     * A Jacobian Coordinate is of the form (x, y, z).
+     * To convert a Jacobian Coordinate to an Affine Point
+     * you do (x / z^2, y / z^3)
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToAffine(array $p)
+    {
+        if (!isset($p[2])) {
+            return $p;
+        }
+        list($x, $y, $z) = $p;
+        $z = $this->one->divide($z);
+        $z2 = $z->multiply($z);
+        return [
+            $x->multiply($z2),
+            $y->multiply($z2)->multiply($z)
+        ];
+    }
+
+    /**
+     * Converts an affine point to a jacobian coordinate
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToInternal(array $p)
+    {
+        if (isset($p[2])) {
+            return $p;
+        }
+
+        $p[2] = clone $this->one;
+        $p['fresh'] = true;
+        return $p;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/KoblitzPrime.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/KoblitzPrime.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/KoblitzPrime.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,335 @@
+<?php
+
+/**
+ * Generalized Koblitz Curves over y^2 = x^3 + b.
+ *
+ * According to http://www.secg.org/SEC2-Ver-1.0.pdf Koblitz curves are over the GF(2**m)
+ * finite field. Both the $a$ and $b$ coefficients are either 0 or 1. However, SEC2
+ * generalizes the definition to include curves over GF(P) "which possess an efficiently
+ * computable endomorphism".
+ *
+ * For these generalized Koblitz curves $b$ doesn't have to be 0 or 1. Whether or not $a$
+ * has any restrictions on it is unclear, however, for all the GF(P) Koblitz curves defined
+ * in SEC2 v1.0 $a$ is $0$ so all of the methods defined herein will assume that it is.
+ *
+ * I suppose we could rename the $b$ coefficient to $a$, however, the documentation refers
+ * to $b$ so we'll just keep it.
+ *
+ * If a later version of SEC2 comes out wherein some $a$ values are non-zero we can create a
+ * new method for those. eg. KoblitzA1Prime.php or something.
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\PrimeField;
+
+/**
+ * Curves over y^2 = x^3 + b
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class KoblitzPrime extends Prime
+{
+    /**
+     * Basis
+     *
+     * @var list<array{a: BigInteger, b: BigInteger}>
+     */
+    protected $basis;
+
+    /**
+     * Beta
+     *
+     * @var PrimeField\Integer
+     */
+    protected $beta;
+
+    // don't overwrite setCoefficients() with one that only accepts one parameter so that
+    // one might be able to switch between KoblitzPrime and Prime more easily (for benchmarking
+    // purposes).
+
+    /**
+     * Multiply and Add Points
+     *
+     * Uses a efficiently computable endomorphism to achieve a slight speedup
+     *
+     * Adapted from:
+     * https://github.com/indutny/elliptic/blob/725bd91/lib/elliptic/curve/short.js#L219
+     *
+     * @return int[]
+     */
+    public function multiplyAddPoints(array $points, array $scalars)
+    {
+        static $zero, $one, $two;
+        if (!isset($two)) {
+            $two = new BigInteger(2);
+            $one = new BigInteger(1);
+        }
+
+        if (!isset($this->beta)) {
+            // get roots
+            $inv = $this->one->divide($this->two)->negate();
+            $s = $this->three->negate()->squareRoot()->multiply($inv);
+            $betas = [
+                $inv->add($s),
+                $inv->subtract($s)
+            ];
+            $this->beta = $betas[0]->compare($betas[1]) < 0 ? $betas[0] : $betas[1];
+            //echo strtoupper($this->beta->toHex(true)) . "\n"; exit;
+        }
+
+        if (!isset($this->basis)) {
+            $factory = new PrimeField($this->order);
+            $tempOne = $factory->newInteger($one);
+            $tempTwo = $factory->newInteger($two);
+            $tempThree = $factory->newInteger(new BigInteger(3));
+
+            $inv = $tempOne->divide($tempTwo)->negate();
+            $s = $tempThree->negate()->squareRoot()->multiply($inv);
+
+            $lambdas = [
+                $inv->add($s),
+                $inv->subtract($s)
+            ];
+
+            $lhs = $this->multiplyPoint($this->p, $lambdas[0])[0];
+            $rhs = $this->p[0]->multiply($this->beta);
+            $lambda = $lhs->equals($rhs) ? $lambdas[0] : $lambdas[1];
+
+            $this->basis = static::extendedGCD($lambda->toBigInteger(), $this->order);
+            ///*
+            foreach ($this->basis as $basis) {
+                echo strtoupper($basis['a']->toHex(true)) . "\n";
+                echo strtoupper($basis['b']->toHex(true)) . "\n\n";
+            }
+            exit;
+            //*/
+        }
+
+        $npoints = $nscalars = [];
+        for ($i = 0; $i < count($points); $i++) {
+            $p = $points[$i];
+            $k = $scalars[$i]->toBigInteger();
+
+            // begin split
+            list($v1, $v2) = $this->basis;
+
+            $c1 = $v2['b']->multiply($k);
+            list($c1, $r) = $c1->divide($this->order);
+            if ($this->order->compare($r->multiply($two)) <= 0) {
+                $c1 = $c1->add($one);
+            }
+
+            $c2 = $v1['b']->negate()->multiply($k);
+            list($c2, $r) = $c2->divide($this->order);
+            if ($this->order->compare($r->multiply($two)) <= 0) {
+                $c2 = $c2->add($one);
+            }
+
+            $p1 = $c1->multiply($v1['a']);
+            $p2 = $c2->multiply($v2['a']);
+            $q1 = $c1->multiply($v1['b']);
+            $q2 = $c2->multiply($v2['b']);
+
+            $k1 = $k->subtract($p1)->subtract($p2);
+            $k2 = $q1->add($q2)->negate();
+            // end split
+
+            $beta = [
+                $p[0]->multiply($this->beta),
+                $p[1],
+                clone $this->one
+            ];
+
+            if (isset($p['naf'])) {
+                $beta['naf'] = array_map(function ($p) {
+                    return [
+                        $p[0]->multiply($this->beta),
+                        $p[1],
+                        clone $this->one
+                    ];
+                }, $p['naf']);
+                $beta['nafwidth'] = $p['nafwidth'];
+            }
+
+            if ($k1->isNegative()) {
+                $k1 = $k1->negate();
+                $p = $this->negatePoint($p);
+            }
+
+            if ($k2->isNegative()) {
+                $k2 = $k2->negate();
+                $beta = $this->negatePoint($beta);
+            }
+
+            $pos = 2 * $i;
+            $npoints[$pos] = $p;
+            $nscalars[$pos] = $this->factory->newInteger($k1);
+
+            $pos++;
+            $npoints[$pos] = $beta;
+            $nscalars[$pos] = $this->factory->newInteger($k2);
+        }
+
+        return parent::multiplyAddPoints($npoints, $nscalars);
+    }
+
+    /**
+     * Returns the numerator and denominator of the slope
+     *
+     * @return FiniteField[]
+     */
+    protected function doublePointHelper(array $p)
+    {
+        $numerator = $this->three->multiply($p[0])->multiply($p[0]);
+        $denominator = $this->two->multiply($p[1]);
+        return [$numerator, $denominator];
+    }
+
+    /**
+     * Doubles a jacobian coordinate on the curve
+     *
+     * See http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#doubling-dbl-2009-l
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianDoublePoint(array $p)
+    {
+        list($x1, $y1, $z1) = $p;
+        $a = $x1->multiply($x1);
+        $b = $y1->multiply($y1);
+        $c = $b->multiply($b);
+        $d = $x1->add($b);
+        $d = $d->multiply($d)->subtract($a)->subtract($c)->multiply($this->two);
+        $e = $this->three->multiply($a);
+        $f = $e->multiply($e);
+        $x3 = $f->subtract($this->two->multiply($d));
+        $y3 = $e->multiply($d->subtract($x3))->subtract(
+            $this->eight->multiply($c)
+        );
+        $z3 = $this->two->multiply($y1)->multiply($z1);
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Doubles a "fresh" jacobian coordinate on the curve
+     *
+     * See http://hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#doubling-mdbl-2007-bl
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianDoublePointMixed(array $p)
+    {
+        list($x1, $y1) = $p;
+        $xx = $x1->multiply($x1);
+        $yy = $y1->multiply($y1);
+        $yyyy = $yy->multiply($yy);
+        $s = $x1->add($yy);
+        $s = $s->multiply($s)->subtract($xx)->subtract($yyyy)->multiply($this->two);
+        $m = $this->three->multiply($xx);
+        $t = $m->multiply($m)->subtract($this->two->multiply($s));
+        $x3 = $t;
+        $y3 = $s->subtract($t);
+        $y3 = $m->multiply($y3)->subtract($this->eight->multiply($yyyy));
+        $z3 = $this->two->multiply($y1);
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Tests whether or not the x / y values satisfy the equation
+     *
+     * @return boolean
+     */
+    public function verifyPoint(array $p)
+    {
+        list($x, $y) = $p;
+        $lhs = $y->multiply($y);
+        $temp = $x->multiply($x)->multiply($x);
+        $rhs = $temp->add($this->b);
+
+        return $lhs->equals($rhs);
+    }
+
+    /**
+     * Calculates the parameters needed from the Euclidean algorithm as discussed at
+     * http://diamond.boisestate.edu/~liljanab/MATH308/GuideToECC.pdf#page=148
+     *
+     * @param BigInteger $u
+     * @param BigInteger $v
+     * @return BigInteger[]
+     */
+    protected static function extendedGCD(BigInteger $u, BigInteger $v)
+    {
+        $one = new BigInteger(1);
+        $zero = new BigInteger();
+
+        $a = clone $one;
+        $b = clone $zero;
+        $c = clone $zero;
+        $d = clone $one;
+
+        $stop = $v->bitwise_rightShift($v->getLength() >> 1);
+
+        $a1 = clone $zero;
+        $b1 = clone $zero;
+        $a2 = clone $zero;
+        $b2 = clone $zero;
+
+        $postGreatestIndex = 0;
+
+        while (!$v->equals($zero)) {
+            list($q) = $u->divide($v);
+
+            $temp = $u;
+            $u = $v;
+            $v = $temp->subtract($v->multiply($q));
+
+            $temp = $a;
+            $a = $c;
+            $c = $temp->subtract($a->multiply($q));
+
+            $temp = $b;
+            $b = $d;
+            $d = $temp->subtract($b->multiply($q));
+
+            if ($v->compare($stop) > 0) {
+                $a0 = $v;
+                $b0 = $c;
+            } else {
+                $postGreatestIndex++;
+            }
+
+            if ($postGreatestIndex == 1) {
+                $a1 = $v;
+                $b1 = $c->negate();
+            }
+
+            if ($postGreatestIndex == 2) {
+                $rhs = $a0->multiply($a0)->add($b0->multiply($b0));
+                $lhs = $v->multiply($v)->add($b->multiply($b));
+                if ($lhs->compare($rhs) <= 0) {
+                    $a2 = $a0;
+                    $b2 = $b0->negate();
+                } else {
+                    $a2 = $v;
+                    $b2 = $c->negate();
+                }
+
+                break;
+            }
+        }
+
+        return [
+            ['a' => $a1, 'b' => $b1],
+            ['a' => $a2, 'b' => $b2]
+        ];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Montgomery.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,279 @@
+<?php
+
+/**
+ * Curves over y^2 = x^3 + a*x + x
+ *
+ * Technically, a Montgomery curve has a coefficient for y^2 but for Curve25519 and Curve448 that
+ * coefficient is 1.
+ *
+ * Curve25519 and Curve448 do not make use of the y coordinate, which makes it unsuitable for use
+ * with ECDSA / EdDSA. A few other differences between Curve25519 and Ed25519 are discussed at
+ * https://crypto.stackexchange.com/a/43058/4520
+ *
+ * More info:
+ *
+ * https://en.wikipedia.org/wiki/Montgomery_curve
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2019 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Crypt\EC\Curves\Curve25519;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\PrimeField;
+use phpseclib3\Math\PrimeField\Integer as PrimeInteger;
+
+/**
+ * Curves over y^2 = x^3 + a*x + x
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Montgomery extends Base
+{
+    /**
+     * Prime Field Integer factory
+     *
+     * @var PrimeField
+     */
+    protected $factory;
+
+    /**
+     * Cofficient for x
+     *
+     * @var object
+     */
+    protected $a;
+
+    /**
+     * Constant used for point doubling
+     *
+     * @var object
+     */
+    protected $a24;
+
+    /**
+     * The Number Zero
+     *
+     * @var object
+     */
+    protected $zero;
+
+    /**
+     * The Number One
+     *
+     * @var object
+     */
+    protected $one;
+
+    /**
+     * Base Point
+     *
+     * @var object
+     */
+    protected $p;
+
+    /**
+     * The modulo
+     *
+     * @var BigInteger
+     */
+    protected $modulo;
+
+    /**
+     * The Order
+     *
+     * @var BigInteger
+     */
+    protected $order;
+
+    /**
+     * Sets the modulo
+     */
+    public function setModulo(BigInteger $modulo)
+    {
+        $this->modulo = $modulo;
+        $this->factory = new PrimeField($modulo);
+        $this->zero = $this->factory->newInteger(new BigInteger());
+        $this->one = $this->factory->newInteger(new BigInteger(1));
+    }
+
+    /**
+     * Set coefficients a
+     */
+    public function setCoefficients(BigInteger $a)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->a = $this->factory->newInteger($a);
+        $two = $this->factory->newInteger(new BigInteger(2));
+        $four = $this->factory->newInteger(new BigInteger(4));
+        $this->a24 = $this->a->subtract($two)->divide($four);
+    }
+
+    /**
+     * Set x and y coordinates for the base point
+     *
+     * @param BigInteger|PrimeInteger $x
+     * @param BigInteger|PrimeInteger $y
+     * @return PrimeInteger[]
+     */
+    public function setBasePoint($x, $y)
+    {
+        switch (true) {
+            case !$x instanceof BigInteger && !$x instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 1 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+            case !$y instanceof BigInteger && !$y instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 2 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+        }
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->p = [
+            $x instanceof BigInteger ? $this->factory->newInteger($x) : $x,
+            $y instanceof BigInteger ? $this->factory->newInteger($y) : $y
+        ];
+    }
+
+    /**
+     * Retrieve the base point as an array
+     *
+     * @return array
+     */
+    public function getBasePoint()
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        /*
+        if (!isset($this->p)) {
+            throw new \RuntimeException('setBasePoint needs to be called before this method');
+        }
+        */
+        return $this->p;
+    }
+
+    /**
+     * Doubles and adds a point on a curve
+     *
+     * See https://tools.ietf.org/html/draft-ietf-tls-curve25519-01#appendix-A.1.3
+     *
+     * @return FiniteField[][]
+     */
+    private function doubleAndAddPoint(array $p, array $q, PrimeInteger $x1)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p) || !count($q)) {
+            return [];
+        }
+
+        if (!isset($p[1])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to XZ coordinates');
+        }
+
+        list($x2, $z2) = $p;
+        list($x3, $z3) = $q;
+
+        $a = $x2->add($z2);
+        $aa = $a->multiply($a);
+        $b = $x2->subtract($z2);
+        $bb = $b->multiply($b);
+        $e = $aa->subtract($bb);
+        $c = $x3->add($z3);
+        $d = $x3->subtract($z3);
+        $da = $d->multiply($a);
+        $cb = $c->multiply($b);
+        $temp = $da->add($cb);
+        $x5 = $temp->multiply($temp);
+        $temp = $da->subtract($cb);
+        $z5 = $x1->multiply($temp->multiply($temp));
+        $x4 = $aa->multiply($bb);
+        $temp = static::class == Curve25519::class ? $bb : $aa;
+        $z4 = $e->multiply($temp->add($this->a24->multiply($e)));
+
+        return [
+            [$x4, $z4],
+            [$x5, $z5]
+        ];
+    }
+
+    /**
+     * Multiply a point on the curve by a scalar
+     *
+     * Uses the montgomery ladder technique as described here:
+     *
+     * https://en.wikipedia.org/wiki/Elliptic_curve_point_multiplication#Montgomery_ladder
+     * https://github.com/phpecc/phpecc/issues/16#issuecomment-59176772
+     *
+     * @return array
+     */
+    public function multiplyPoint(array $p, BigInteger $d)
+    {
+        $p1 = [$this->one, $this->zero];
+        $alreadyInternal = isset($x[1]);
+        $p2 = $this->convertToInternal($p);
+        $x = $p[0];
+
+        $b = $d->toBits();
+        $b = str_pad($b, 256, '0', STR_PAD_LEFT);
+        for ($i = 0; $i < strlen($b); $i++) {
+            $b_i = (int) $b[$i];
+            if ($b_i) {
+                list($p2, $p1) = $this->doubleAndAddPoint($p2, $p1, $x);
+            } else {
+                list($p1, $p2) = $this->doubleAndAddPoint($p1, $p2, $x);
+            }
+        }
+
+        return $alreadyInternal ? $p1 : $this->convertToAffine($p1);
+    }
+
+    /**
+     * Converts an affine point to an XZ coordinate
+     *
+     * From https://hyperelliptic.org/EFD/g1p/auto-montgom-xz.html
+     *
+     * XZ coordinates represent x y as X Z satsfying the following equations:
+     *
+     *   x=X/Z
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToInternal(array $p)
+    {
+        if (empty($p)) {
+            return [clone $this->zero, clone $this->one];
+        }
+
+        if (isset($p[1])) {
+            return $p;
+        }
+
+        $p[1] = clone $this->one;
+
+        return $p;
+    }
+
+    /**
+     * Returns the affine point
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToAffine(array $p)
+    {
+        if (!isset($p[1])) {
+            return $p;
+        }
+        list($x, $z) = $p;
+        return [$x->divide($z)];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Prime.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Prime.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/Prime.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,785 @@
+<?php
+
+/**
+ * Curves over y^2 = x^3 + a*x + b
+ *
+ * These are curves used in SEC 2 over prime fields: http://www.secg.org/SEC2-Ver-1.0.pdf
+ * The curve is a weierstrass curve with a[1], a[3] and a[2] set to 0.
+ *
+ * Uses Jacobian Coordinates for speed if able:
+ *
+ * https://en.wikipedia.org/wiki/Jacobian_curve
+ * https://en.wikibooks.org/wiki/Cryptography/Prime_Curve/Jacobian_Coordinates
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\Common\FiniteField\Integer;
+use phpseclib3\Math\PrimeField;
+use phpseclib3\Math\PrimeField\Integer as PrimeInteger;
+
+/**
+ * Curves over y^2 = x^3 + a*x + b
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Prime extends Base
+{
+    /**
+     * Prime Field Integer factory
+     *
+     * @var \phpseclib3\Math\PrimeFields
+     */
+    protected $factory;
+
+    /**
+     * Cofficient for x^1
+     *
+     * @var object
+     */
+    protected $a;
+
+    /**
+     * Cofficient for x^0
+     *
+     * @var object
+     */
+    protected $b;
+
+    /**
+     * Base Point
+     *
+     * @var object
+     */
+    protected $p;
+
+    /**
+     * The number one over the specified finite field
+     *
+     * @var object
+     */
+    protected $one;
+
+    /**
+     * The number two over the specified finite field
+     *
+     * @var object
+     */
+    protected $two;
+
+    /**
+     * The number three over the specified finite field
+     *
+     * @var object
+     */
+    protected $three;
+
+    /**
+     * The number four over the specified finite field
+     *
+     * @var object
+     */
+    protected $four;
+
+    /**
+     * The number eight over the specified finite field
+     *
+     * @var object
+     */
+    protected $eight;
+
+    /**
+     * The modulo
+     *
+     * @var BigInteger
+     */
+    protected $modulo;
+
+    /**
+     * The Order
+     *
+     * @var BigInteger
+     */
+    protected $order;
+
+    /**
+     * Sets the modulo
+     */
+    public function setModulo(BigInteger $modulo)
+    {
+        $this->modulo = $modulo;
+        $this->factory = new PrimeField($modulo);
+        $this->two = $this->factory->newInteger(new BigInteger(2));
+        $this->three = $this->factory->newInteger(new BigInteger(3));
+        // used by jacobian coordinates
+        $this->one = $this->factory->newInteger(new BigInteger(1));
+        $this->four = $this->factory->newInteger(new BigInteger(4));
+        $this->eight = $this->factory->newInteger(new BigInteger(8));
+    }
+
+    /**
+     * Set coefficients a and b
+     */
+    public function setCoefficients(BigInteger $a, BigInteger $b)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->a = $this->factory->newInteger($a);
+        $this->b = $this->factory->newInteger($b);
+    }
+
+    /**
+     * Set x and y coordinates for the base point
+     *
+     * @param BigInteger|PrimeInteger $x
+     * @param BigInteger|PrimeInteger $y
+     * @return PrimeInteger[]
+     */
+    public function setBasePoint($x, $y)
+    {
+        switch (true) {
+            case !$x instanceof BigInteger && !$x instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 1 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+            case !$y instanceof BigInteger && !$y instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 2 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+        }
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->p = [
+            $x instanceof BigInteger ? $this->factory->newInteger($x) : $x,
+            $y instanceof BigInteger ? $this->factory->newInteger($y) : $y
+        ];
+    }
+
+    /**
+     * Retrieve the base point as an array
+     *
+     * @return array
+     */
+    public function getBasePoint()
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        /*
+        if (!isset($this->p)) {
+            throw new \RuntimeException('setBasePoint needs to be called before this method');
+        }
+        */
+        return $this->p;
+    }
+
+    /**
+     * Adds two "fresh" jacobian form on the curve
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianAddPointMixedXY(array $p, array $q)
+    {
+        list($u1, $s1) = $p;
+        list($u2, $s2) = $q;
+        if ($u1->equals($u2)) {
+            if (!$s1->equals($s2)) {
+                return [];
+            } else {
+                return $this->doublePoint($p);
+            }
+        }
+        $h = $u2->subtract($u1);
+        $r = $s2->subtract($s1);
+        $h2 = $h->multiply($h);
+        $h3 = $h2->multiply($h);
+        $v = $u1->multiply($h2);
+        $x3 = $r->multiply($r)->subtract($h3)->subtract($v->multiply($this->two));
+        $y3 = $r->multiply(
+            $v->subtract($x3)
+        )->subtract(
+            $s1->multiply($h3)
+        );
+        return [$x3, $y3, $h];
+    }
+
+    /**
+     * Adds one "fresh" jacobian form on the curve
+     *
+     * The second parameter should be the "fresh" one
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianAddPointMixedX(array $p, array $q)
+    {
+        list($u1, $s1, $z1) = $p;
+        list($x2, $y2) = $q;
+
+        $z12 = $z1->multiply($z1);
+
+        $u2 = $x2->multiply($z12);
+        $s2 = $y2->multiply($z12->multiply($z1));
+        if ($u1->equals($u2)) {
+            if (!$s1->equals($s2)) {
+                return [];
+            } else {
+                return $this->doublePoint($p);
+            }
+        }
+        $h = $u2->subtract($u1);
+        $r = $s2->subtract($s1);
+        $h2 = $h->multiply($h);
+        $h3 = $h2->multiply($h);
+        $v = $u1->multiply($h2);
+        $x3 = $r->multiply($r)->subtract($h3)->subtract($v->multiply($this->two));
+        $y3 = $r->multiply(
+            $v->subtract($x3)
+        )->subtract(
+            $s1->multiply($h3)
+        );
+        $z3 = $h->multiply($z1);
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Adds two jacobian coordinates on the curve
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianAddPoint(array $p, array $q)
+    {
+        list($x1, $y1, $z1) = $p;
+        list($x2, $y2, $z2) = $q;
+
+        $z12 = $z1->multiply($z1);
+        $z22 = $z2->multiply($z2);
+
+        $u1 = $x1->multiply($z22);
+        $u2 = $x2->multiply($z12);
+        $s1 = $y1->multiply($z22->multiply($z2));
+        $s2 = $y2->multiply($z12->multiply($z1));
+        if ($u1->equals($u2)) {
+            if (!$s1->equals($s2)) {
+                return [];
+            } else {
+                return $this->doublePoint($p);
+            }
+        }
+        $h = $u2->subtract($u1);
+        $r = $s2->subtract($s1);
+        $h2 = $h->multiply($h);
+        $h3 = $h2->multiply($h);
+        $v = $u1->multiply($h2);
+        $x3 = $r->multiply($r)->subtract($h3)->subtract($v->multiply($this->two));
+        $y3 = $r->multiply(
+            $v->subtract($x3)
+        )->subtract(
+            $s1->multiply($h3)
+        );
+        $z3 = $h->multiply($z1)->multiply($z2);
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Adds two points on the curve
+     *
+     * @return FiniteField[]
+     */
+    public function addPoint(array $p, array $q)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p) || !count($q)) {
+            if (count($q)) {
+                return $q;
+            }
+            if (count($p)) {
+                return $p;
+            }
+            return [];
+        }
+
+        // use jacobian coordinates
+        if (isset($p[2]) && isset($q[2])) {
+            if (isset($p['fresh']) && isset($q['fresh'])) {
+                return $this->jacobianAddPointMixedXY($p, $q);
+            }
+            if (isset($p['fresh'])) {
+                return $this->jacobianAddPointMixedX($q, $p);
+            }
+            if (isset($q['fresh'])) {
+                return $this->jacobianAddPointMixedX($p, $q);
+            }
+            return $this->jacobianAddPoint($p, $q);
+        }
+
+        if (isset($p[2]) || isset($q[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to Jacobi coordinates or vice versa');
+        }
+
+        if ($p[0]->equals($q[0])) {
+            if (!$p[1]->equals($q[1])) {
+                return [];
+            } else { // eg. doublePoint
+                list($numerator, $denominator) = $this->doublePointHelper($p);
+            }
+        } else {
+            $numerator = $q[1]->subtract($p[1]);
+            $denominator = $q[0]->subtract($p[0]);
+        }
+        $slope = $numerator->divide($denominator);
+        $x = $slope->multiply($slope)->subtract($p[0])->subtract($q[0]);
+        $y = $slope->multiply($p[0]->subtract($x))->subtract($p[1]);
+
+        return [$x, $y];
+    }
+
+    /**
+     * Returns the numerator and denominator of the slope
+     *
+     * @return FiniteField[]
+     */
+    protected function doublePointHelper(array $p)
+    {
+        $numerator = $this->three->multiply($p[0])->multiply($p[0])->add($this->a);
+        $denominator = $this->two->multiply($p[1]);
+        return [$numerator, $denominator];
+    }
+
+    /**
+     * Doubles a jacobian coordinate on the curve
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianDoublePoint(array $p)
+    {
+        list($x, $y, $z) = $p;
+        $x2 = $x->multiply($x);
+        $y2 = $y->multiply($y);
+        $z2 = $z->multiply($z);
+        $s = $this->four->multiply($x)->multiply($y2);
+        $m1 = $this->three->multiply($x2);
+        $m2 = $this->a->multiply($z2->multiply($z2));
+        $m = $m1->add($m2);
+        $x1 = $m->multiply($m)->subtract($this->two->multiply($s));
+        $y1 = $m->multiply($s->subtract($x1))->subtract(
+            $this->eight->multiply($y2->multiply($y2))
+        );
+        $z1 = $this->two->multiply($y)->multiply($z);
+        return [$x1, $y1, $z1];
+    }
+
+    /**
+     * Doubles a "fresh" jacobian coordinate on the curve
+     *
+     * @return FiniteField[]
+     */
+    protected function jacobianDoublePointMixed(array $p)
+    {
+        list($x, $y) = $p;
+        $x2 = $x->multiply($x);
+        $y2 = $y->multiply($y);
+        $s = $this->four->multiply($x)->multiply($y2);
+        $m1 = $this->three->multiply($x2);
+        $m = $m1->add($this->a);
+        $x1 = $m->multiply($m)->subtract($this->two->multiply($s));
+        $y1 = $m->multiply($s->subtract($x1))->subtract(
+            $this->eight->multiply($y2->multiply($y2))
+        );
+        $z1 = $this->two->multiply($y);
+        return [$x1, $y1, $z1];
+    }
+
+    /**
+     * Doubles a point on a curve
+     *
+     * @return FiniteField[]
+     */
+    public function doublePoint(array $p)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p)) {
+            return [];
+        }
+
+        // use jacobian coordinates
+        if (isset($p[2])) {
+            if (isset($p['fresh'])) {
+                return $this->jacobianDoublePointMixed($p);
+            }
+            return $this->jacobianDoublePoint($p);
+        }
+
+        list($numerator, $denominator) = $this->doublePointHelper($p);
+
+        $slope = $numerator->divide($denominator);
+
+        $x = $slope->multiply($slope)->subtract($p[0])->subtract($p[0]);
+        $y = $slope->multiply($p[0]->subtract($x))->subtract($p[1]);
+
+        return [$x, $y];
+    }
+
+    /**
+     * Returns the X coordinate and the derived Y coordinate
+     *
+     * @return array
+     */
+    public function derivePoint($m)
+    {
+        $y = ord(Strings::shift($m));
+        $x = new BigInteger($m, 256);
+        $xp = $this->convertInteger($x);
+        switch ($y) {
+            case 2:
+                $ypn = false;
+                break;
+            case 3:
+                $ypn = true;
+                break;
+            default:
+                throw new \RuntimeException('Coordinate not in recognized format');
+        }
+        $temp = $xp->multiply($this->a);
+        $temp = $xp->multiply($xp)->multiply($xp)->add($temp);
+        $temp = $temp->add($this->b);
+        $b = $temp->squareRoot();
+        if (!$b) {
+            throw new \RuntimeException('Unable to derive Y coordinate');
+        }
+        $bn = $b->isOdd();
+        $yp = $ypn == $bn ? $b : $b->negate();
+        return [$xp, $yp];
+    }
+
+    /**
+     * Tests whether or not the x / y values satisfy the equation
+     *
+     * @return boolean
+     */
+    public function verifyPoint(array $p)
+    {
+        list($x, $y) = $p;
+        $lhs = $y->multiply($y);
+        $temp = $x->multiply($this->a);
+        $temp = $x->multiply($x)->multiply($x)->add($temp);
+        $rhs = $temp->add($this->b);
+
+        return $lhs->equals($rhs);
+    }
+
+    /**
+     * Returns the modulo
+     *
+     * @return BigInteger
+     */
+    public function getModulo()
+    {
+        return $this->modulo;
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return PrimeInteger
+     */
+    public function getA()
+    {
+        return $this->a;
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return PrimeInteger
+     */
+    public function getB()
+    {
+        return $this->b;
+    }
+
+    /**
+     * Multiply and Add Points
+     *
+     * Adapted from:
+     * https://github.com/indutny/elliptic/blob/725bd91/lib/elliptic/curve/base.js#L125
+     *
+     * @return int[]
+     */
+    public function multiplyAddPoints(array $points, array $scalars)
+    {
+        $length = count($points);
+
+        foreach ($points as &$point) {
+            $point = $this->convertToInternal($point);
+        }
+
+        $wnd = [$this->getNAFPoints($points[0], 7)];
+        $wndWidth = [isset($points[0]['nafwidth']) ? $points[0]['nafwidth'] : 7];
+        for ($i = 1; $i < $length; $i++) {
+            $wnd[] = $this->getNAFPoints($points[$i], 1);
+            $wndWidth[] = isset($points[$i]['nafwidth']) ? $points[$i]['nafwidth'] : 1;
+        }
+
+        $naf = [];
+
+        // comb all window NAFs
+
+        $max = 0;
+        for ($i = $length - 1; $i >= 1; $i -= 2) {
+            $a = $i - 1;
+            $b = $i;
+            if ($wndWidth[$a] != 1 || $wndWidth[$b] != 1) {
+                $naf[$a] = $scalars[$a]->getNAF($wndWidth[$a]);
+                $naf[$b] = $scalars[$b]->getNAF($wndWidth[$b]);
+                $max = max(count($naf[$a]), count($naf[$b]), $max);
+                continue;
+            }
+
+            $comb = [
+                $points[$a], // 1
+                null,        // 3
+                null,        // 5
+                $points[$b]  // 7
+            ];
+
+            $comb[1] = $this->addPoint($points[$a], $points[$b]);
+            $comb[2] = $this->addPoint($points[$a], $this->negatePoint($points[$b]));
+
+            $index = [
+                -3, /* -1 -1 */
+                -1, /* -1  0 */
+                -5, /* -1  1 */
+                -7, /*  0 -1 */
+                 0, /*  0 -1 */
+                 7, /*  0  1 */
+                 5, /*  1 -1 */
+                 1, /*  1  0 */
+                 3  /*  1  1 */
+            ];
+
+            $jsf = self::getJSFPoints($scalars[$a], $scalars[$b]);
+
+            $max = max(count($jsf[0]), $max);
+            if ($max > 0) {
+                $naf[$a] = array_fill(0, $max, 0);
+                $naf[$b] = array_fill(0, $max, 0);
+            } else {
+                $naf[$a] = [];
+                $naf[$b] = [];
+            }
+
+            for ($j = 0; $j < $max; $j++) {
+                $ja = isset($jsf[0][$j]) ? $jsf[0][$j] : 0;
+                $jb = isset($jsf[1][$j]) ? $jsf[1][$j] : 0;
+
+                $naf[$a][$j] = $index[3 * ($ja + 1) + $jb + 1];
+                $naf[$b][$j] = 0;
+                $wnd[$a] = $comb;
+            }
+        }
+
+        $acc = [];
+        $temp = [0, 0, 0, 0];
+        for ($i = $max; $i >= 0; $i--) {
+            $k = 0;
+            while ($i >= 0) {
+                $zero = true;
+                for ($j = 0; $j < $length; $j++) {
+                    $temp[$j] = isset($naf[$j][$i]) ? $naf[$j][$i] : 0;
+                    if ($temp[$j] != 0) {
+                        $zero = false;
+                    }
+                }
+                if (!$zero) {
+                    break;
+                }
+                $k++;
+                $i--;
+            }
+
+            if ($i >= 0) {
+                $k++;
+            }
+            while ($k--) {
+                $acc = $this->doublePoint($acc);
+            }
+
+            if ($i < 0) {
+                break;
+            }
+
+            for ($j = 0; $j < $length; $j++) {
+                $z = $temp[$j];
+                $p = null;
+                if ($z == 0) {
+                    continue;
+                }
+                $p = $z > 0 ?
+                    $wnd[$j][($z - 1) >> 1] :
+                    $this->negatePoint($wnd[$j][(-$z - 1) >> 1]);
+                $acc = $this->addPoint($acc, $p);
+            }
+        }
+
+        return $this->convertToAffine($acc);
+    }
+
+    /**
+     * Precomputes NAF points
+     *
+     * Adapted from:
+     * https://github.com/indutny/elliptic/blob/725bd91/lib/elliptic/curve/base.js#L351
+     *
+     * @return int[]
+     */
+    private function getNAFPoints(array $point, $wnd)
+    {
+        if (isset($point['naf'])) {
+            return $point['naf'];
+        }
+
+        $res = [$point];
+        $max = (1 << $wnd) - 1;
+        $dbl = $max == 1 ? null : $this->doublePoint($point);
+        for ($i = 1; $i < $max; $i++) {
+            $res[] = $this->addPoint($res[$i - 1], $dbl);
+        }
+
+        $point['naf'] = $res;
+
+        /*
+        $str = '';
+        foreach ($res as $re) {
+            $re[0] = bin2hex($re[0]->toBytes());
+            $re[1] = bin2hex($re[1]->toBytes());
+            $str.= "            ['$re[0]', '$re[1]'],\r\n";
+        }
+        file_put_contents('temp.txt', $str);
+        exit;
+        */
+
+        return $res;
+    }
+
+    /**
+     * Precomputes points in Joint Sparse Form
+     *
+     * Adapted from:
+     * https://github.com/indutny/elliptic/blob/725bd91/lib/elliptic/utils.js#L96
+     *
+     * @return int[]
+     */
+    private static function getJSFPoints(Integer $k1, Integer $k2)
+    {
+        static $three;
+        if (!isset($three)) {
+            $three = new BigInteger(3);
+        }
+
+        $jsf = [[], []];
+        $k1 = $k1->toBigInteger();
+        $k2 = $k2->toBigInteger();
+        $d1 = 0;
+        $d2 = 0;
+
+        while ($k1->compare(new BigInteger(-$d1)) > 0 || $k2->compare(new BigInteger(-$d2)) > 0) {
+            // first phase
+            $m14 = $k1->testBit(0) + 2 * $k1->testBit(1);
+            $m14 += $d1;
+            $m14 &= 3;
+
+            $m24 = $k2->testBit(0) + 2 * $k2->testBit(1);
+            $m24 += $d2;
+            $m24 &= 3;
+
+            if ($m14 == 3) {
+                $m14 = -1;
+            }
+            if ($m24 == 3) {
+                $m24 = -1;
+            }
+
+            $u1 = 0;
+            if ($m14 & 1) { // if $m14 is odd
+                $m8 = $k1->testBit(0) + 2 * $k1->testBit(1) + 4 * $k1->testBit(2);
+                $m8 += $d1;
+                $m8 &= 7;
+                $u1 = ($m8 == 3 || $m8 == 5) && $m24 == 2 ? -$m14 : $m14;
+            }
+            $jsf[0][] = $u1;
+
+            $u2 = 0;
+            if ($m24 & 1) { // if $m24 is odd
+                $m8 = $k2->testBit(0) + 2 * $k2->testBit(1) + 4 * $k2->testBit(2);
+                $m8 += $d2;
+                $m8 &= 7;
+                $u2 = ($m8 == 3 || $m8 == 5) && $m14 == 2 ? -$m24 : $m24;
+            }
+            $jsf[1][] = $u2;
+
+            // second phase
+            if (2 * $d1 == $u1 + 1) {
+                $d1 = 1 - $d1;
+            }
+            if (2 * $d2 == $u2 + 1) {
+                $d2 = 1 - $d2;
+            }
+            $k1 = $k1->bitwise_rightShift(1);
+            $k2 = $k2->bitwise_rightShift(1);
+        }
+
+        return $jsf;
+    }
+
+    /**
+     * Returns the affine point
+     *
+     * A Jacobian Coordinate is of the form (x, y, z).
+     * To convert a Jacobian Coordinate to an Affine Point
+     * you do (x / z^2, y / z^3)
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToAffine(array $p)
+    {
+        if (!isset($p[2])) {
+            return $p;
+        }
+        list($x, $y, $z) = $p;
+        $z = $this->one->divide($z);
+        $z2 = $z->multiply($z);
+        return [
+            $x->multiply($z2),
+            $y->multiply($z2)->multiply($z)
+        ];
+    }
+
+    /**
+     * Converts an affine point to a jacobian coordinate
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToInternal(array $p)
+    {
+        if (isset($p[2])) {
+            return $p;
+        }
+
+        $p[2] = clone $this->one;
+        $p['fresh'] = true;
+        return $p;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/TwistedEdwards.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/TwistedEdwards.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/BaseCurves/TwistedEdwards.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,215 @@
+<?php
+
+/**
+ * Curves over a*x^2 + y^2 = 1 + d*x^2*y^2
+ *
+ * http://www.secg.org/SEC2-Ver-1.0.pdf provides for curves with custom parameters.
+ * ie. the coefficients can be arbitrary set through specially formatted keys, etc.
+ * As such, Prime.php is built very generically and it's not able to take full
+ * advantage of curves with 0 coefficients to produce simplified point doubling,
+ * point addition. Twisted Edwards curves, in contrast, do not have a way, currently,
+ * to customize them. As such, we can omit the super generic stuff from this class
+ * and let the named curves (Ed25519 and Ed448) define their own custom tailored
+ * point addition and point doubling methods.
+ *
+ * More info:
+ *
+ * https://en.wikipedia.org/wiki/Twisted_Edwards_curve
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\BaseCurves;
+
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\PrimeField;
+use phpseclib3\Math\PrimeField\Integer as PrimeInteger;
+
+/**
+ * Curves over a*x^2 + y^2 = 1 + d*x^2*y^2
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class TwistedEdwards extends Base
+{
+    /**
+     * The modulo
+     *
+     * @var BigInteger
+     */
+    protected $modulo;
+
+    /**
+     * Cofficient for x^2
+     *
+     * @var object
+     */
+    protected $a;
+
+    /**
+     * Cofficient for x^2*y^2
+     *
+     * @var object
+     */
+    protected $d;
+
+    /**
+     * Base Point
+     *
+     * @var object[]
+     */
+    protected $p;
+
+    /**
+     * The number zero over the specified finite field
+     *
+     * @var object
+     */
+    protected $zero;
+
+    /**
+     * The number one over the specified finite field
+     *
+     * @var object
+     */
+    protected $one;
+
+    /**
+     * The number two over the specified finite field
+     *
+     * @var object
+     */
+    protected $two;
+
+    /**
+     * Sets the modulo
+     */
+    public function setModulo(BigInteger $modulo)
+    {
+        $this->modulo = $modulo;
+        $this->factory = new PrimeField($modulo);
+        $this->zero = $this->factory->newInteger(new BigInteger(0));
+        $this->one = $this->factory->newInteger(new BigInteger(1));
+        $this->two = $this->factory->newInteger(new BigInteger(2));
+    }
+
+    /**
+     * Set coefficients a and b
+     */
+    public function setCoefficients(BigInteger $a, BigInteger $d)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->a = $this->factory->newInteger($a);
+        $this->d = $this->factory->newInteger($d);
+    }
+
+    /**
+     * Set x and y coordinates for the base point
+     */
+    public function setBasePoint($x, $y)
+    {
+        switch (true) {
+            case !$x instanceof BigInteger && !$x instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 1 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+            case !$y instanceof BigInteger && !$y instanceof PrimeInteger:
+                throw new \UnexpectedValueException('Argument 2 passed to Prime::setBasePoint() must be an instance of either BigInteger or PrimeField\Integer');
+        }
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        $this->p = [
+            $x instanceof BigInteger ? $this->factory->newInteger($x) : $x,
+            $y instanceof BigInteger ? $this->factory->newInteger($y) : $y
+        ];
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return PrimeInteger
+     */
+    public function getA()
+    {
+        return $this->a;
+    }
+
+    /**
+     * Returns the a coefficient
+     *
+     * @return PrimeInteger
+     */
+    public function getD()
+    {
+        return $this->d;
+    }
+
+    /**
+     * Retrieve the base point as an array
+     *
+     * @return array
+     */
+    public function getBasePoint()
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+        /*
+        if (!isset($this->p)) {
+            throw new \RuntimeException('setBasePoint needs to be called before this method');
+        }
+        */
+        return $this->p;
+    }
+
+    /**
+     * Returns the affine point
+     *
+     * @return PrimeField\Integer[]
+     */
+    public function convertToAffine(array $p)
+    {
+        if (!isset($p[2])) {
+            return $p;
+        }
+        list($x, $y, $z) = $p;
+        $z = $this->one->divide($z);
+        return [
+            $x->multiply($z),
+            $y->multiply($z)
+        ];
+    }
+
+    /**
+     * Returns the modulo
+     *
+     * @return BigInteger
+     */
+    public function getModulo()
+    {
+        return $this->modulo;
+    }
+
+    /**
+     * Tests whether or not the x / y values satisfy the equation
+     *
+     * @return boolean
+     */
+    public function verifyPoint(array $p)
+    {
+        list($x, $y) = $p;
+        $x2 = $x->multiply($x);
+        $y2 = $y->multiply($y);
+
+        $lhs = $this->a->multiply($x2)->add($y2);
+        $rhs = $this->d->multiply($x2)->multiply($y2)->add($this->one);
+
+        return $lhs->equals($rhs);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve25519.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve25519.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve25519.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * Curve25519
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2019 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery;
+use phpseclib3\Math\BigInteger;
+
+class Curve25519 extends Montgomery
+{
+    public function __construct()
+    {
+        // 2^255 - 19
+        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED', 16));
+        $this->a24 = $this->factory->newInteger(new BigInteger('121666'));
+        $this->p = [$this->factory->newInteger(new BigInteger(9))];
+        // 2^252 + 0x14def9dea2f79cd65812631a5cf5d3ed
+        $this->setOrder(new BigInteger('1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED', 16));
+
+        /*
+        $this->setCoefficients(
+            new BigInteger('486662'), // a
+        );
+        $this->setBasePoint(
+            new BigInteger(9),
+            new BigInteger('14781619447589544791020593568409986887264606134616475288964881837755586237401')
+        );
+        */
+    }
+
+    /**
+     * Multiply a point on the curve by a scalar
+     *
+     * Modifies the scalar as described at https://tools.ietf.org/html/rfc7748#page-8
+     *
+     * @return array
+     */
+    public function multiplyPoint(array $p, BigInteger $d)
+    {
+        //$r = strrev(sodium_crypto_scalarmult($d->toBytes(), strrev($p[0]->toBytes())));
+        //return [$this->factory->newInteger(new BigInteger($r, 256))];
+
+        $d = $d->toBytes();
+        $d &= "\xF8" . str_repeat("\xFF", 30) . "\x7F";
+        $d = strrev($d);
+        $d |= "\x40";
+        $d = new BigInteger($d, -256);
+
+        return parent::multiplyPoint($p, $d);
+    }
+
+    /**
+     * Creates a random scalar multiplier
+     *
+     * @return BigInteger
+     */
+    public function createRandomMultiplier()
+    {
+        return BigInteger::random(256);
+    }
+
+    /**
+     * Performs range check
+     */
+    public function rangeCheck(BigInteger $x)
+    {
+        if ($x->getLength() > 256 || $x->isNegative()) {
+            throw new \RangeException('x must be a positive integer less than 256 bytes in length');
+        }
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve448.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve448.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Curve448.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,92 @@
+<?php
+
+/**
+ * Curve448
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2019 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery;
+use phpseclib3\Math\BigInteger;
+
+class Curve448 extends Montgomery
+{
+    public function __construct()
+    {
+        // 2^448 - 2^224 - 1
+        $this->setModulo(new BigInteger(
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE' .
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF',
+            16
+        ));
+        $this->a24 = $this->factory->newInteger(new BigInteger('39081'));
+        $this->p = [$this->factory->newInteger(new BigInteger(5))];
+        // 2^446 - 0x8335dc163bb124b65129c96fde933d8d723a70aadc873d6d54a7bb0d
+        $this->setOrder(new BigInteger(
+            '3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+            '7CCA23E9C44EDB49AED63690216CC2728DC58F552378C292AB5844F3',
+            16
+        ));
+
+        /*
+        $this->setCoefficients(
+            new BigInteger('156326'), // a
+        );
+        $this->setBasePoint(
+            new BigInteger(5),
+            new BigInteger(
+                '355293926785568175264127502063783334808976399387714271831880898' .
+                '435169088786967410002932673765864550910142774147268105838985595290' .
+                '606362')
+        );
+        */
+    }
+
+    /**
+     * Multiply a point on the curve by a scalar
+     *
+     * Modifies the scalar as described at https://tools.ietf.org/html/rfc7748#page-8
+     *
+     * @return array
+     */
+    public function multiplyPoint(array $p, BigInteger $d)
+    {
+        //$r = strrev(sodium_crypto_scalarmult($d->toBytes(), strrev($p[0]->toBytes())));
+        //return [$this->factory->newInteger(new BigInteger($r, 256))];
+
+        $d = $d->toBytes();
+        $d[0] = $d[0] & "\xFC";
+        $d = strrev($d);
+        $d |= "\x80";
+        $d = new BigInteger($d, 256);
+
+        return parent::multiplyPoint($p, $d);
+    }
+
+    /**
+     * Creates a random scalar multiplier
+     *
+     * @return BigInteger
+     */
+    public function createRandomMultiplier()
+    {
+        return BigInteger::random(446);
+    }
+
+    /**
+     * Performs range check
+     */
+    public function rangeCheck(BigInteger $x)
+    {
+        if ($x->getLength() > 448 || $x->isNegative()) {
+            throw new \RangeException('x must be a positive integer less than 446 bytes in length');
+        }
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed25519.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed25519.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed25519.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,333 @@
+<?php
+
+/**
+ * Ed25519
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Math\BigInteger;
+
+class Ed25519 extends TwistedEdwards
+{
+    const HASH = 'sha512';
+    /*
+      Per https://tools.ietf.org/html/rfc8032#page-6 EdDSA has several parameters, one of which is b:
+
+      2.   An integer b with 2^(b-1) > p.  EdDSA public keys have exactly b
+           bits, and EdDSA signatures have exactly 2*b bits.  b is
+           recommended to be a multiple of 8, so public key and signature
+           lengths are an integral number of octets.
+
+      SIZE corresponds to b
+    */
+    const SIZE = 32;
+
+    public function __construct()
+    {
+        // 2^255 - 19
+        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED', 16));
+        $this->setCoefficients(
+            // -1
+            new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEC', 16), // a
+            // -121665/121666
+            new BigInteger('52036CEE2B6FFE738CC740797779E89800700A4D4141D8AB75EB4DCA135978A3', 16)  // d
+        );
+        $this->setBasePoint(
+            new BigInteger('216936D3CD6E53FEC0A4E231FDD6DC5C692CC7609525A7B2C9562D608F25D51A', 16),
+            new BigInteger('6666666666666666666666666666666666666666666666666666666666666658', 16)
+        );
+        $this->setOrder(new BigInteger('1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED', 16));
+        // algorithm 14.47 from http://cacr.uwaterloo.ca/hac/about/chap14.pdf#page=16
+        /*
+        $this->setReduction(function($x) {
+            $parts = $x->bitwise_split(255);
+            $className = $this->className;
+
+            if (count($parts) > 2) {
+                list(, $r) = $x->divide($className::$modulo);
+                return $r;
+            }
+
+            $zero = new BigInteger();
+            $c = new BigInteger(19);
+
+            switch (count($parts)) {
+                case 2:
+                    list($qi, $ri) = $parts;
+                    break;
+                case 1:
+                    $qi = $zero;
+                    list($ri) = $parts;
+                    break;
+                case 0:
+                    return $zero;
+            }
+            $r = $ri;
+
+            while ($qi->compare($zero) > 0) {
+                $temp = $qi->multiply($c)->bitwise_split(255);
+                if (count($temp) == 2) {
+                    list($qi, $ri) = $temp;
+                } else {
+                    $qi = $zero;
+                    list($ri) = $temp;
+                }
+                $r = $r->add($ri);
+            }
+
+            while ($r->compare($className::$modulo) > 0) {
+                $r = $r->subtract($className::$modulo);
+            }
+            return $r;
+        });
+        */
+    }
+
+    /**
+     * Recover X from Y
+     *
+     * Implements steps 2-4 at https://tools.ietf.org/html/rfc8032#section-5.1.3
+     *
+     * Used by EC\Keys\Common.php
+     *
+     * @param BigInteger $y
+     * @param boolean $sign
+     * @return object[]
+     */
+    public function recoverX(BigInteger $y, $sign)
+    {
+        $y = $this->factory->newInteger($y);
+
+        $y2 = $y->multiply($y);
+        $u = $y2->subtract($this->one);
+        $v = $this->d->multiply($y2)->add($this->one);
+        $x2 = $u->divide($v);
+        if ($x2->equals($this->zero)) {
+            if ($sign) {
+                throw new \RuntimeException('Unable to recover X coordinate (x2 = 0)');
+            }
+            return clone $this->zero;
+        }
+        // find the square root
+        /* we don't do $x2->squareRoot() because, quoting from
+           https://tools.ietf.org/html/rfc8032#section-5.1.1:
+
+           "For point decoding or "decompression", square roots modulo p are
+            needed.  They can be computed using the Tonelli-Shanks algorithm or
+            the special case for p = 5 (mod 8).  To find a square root of a,
+            first compute the candidate root x = a^((p+3)/8) (mod p)."
+         */
+        $exp = $this->getModulo()->add(new BigInteger(3));
+        $exp = $exp->bitwise_rightShift(3);
+        $x = $x2->pow($exp);
+
+        // If v x^2 = -u (mod p), set x <-- x * 2^((p-1)/4), which is a square root.
+        if (!$x->multiply($x)->subtract($x2)->equals($this->zero)) {
+            $temp = $this->getModulo()->subtract(new BigInteger(1));
+            $temp = $temp->bitwise_rightShift(2);
+            $temp = $this->two->pow($temp);
+            $x = $x->multiply($temp);
+            if (!$x->multiply($x)->subtract($x2)->equals($this->zero)) {
+                throw new \RuntimeException('Unable to recover X coordinate');
+            }
+        }
+        if ($x->isOdd() != $sign) {
+            $x = $x->negate();
+        }
+
+        return [$x, $y];
+    }
+
+    /**
+     * Extract Secret Scalar
+     *
+     * Implements steps 1-3 at https://tools.ietf.org/html/rfc8032#section-5.1.5
+     *
+     * Used by the various key handlers
+     *
+     * @param string $str
+     * @return array
+     */
+    public function extractSecret($str)
+    {
+        if (strlen($str) != 32) {
+            throw new \LengthException('Private Key should be 32-bytes long');
+        }
+        // 1.  Hash the 32-byte private key using SHA-512, storing the digest in
+        //     a 64-octet large buffer, denoted h.  Only the lower 32 bytes are
+        //     used for generating the public key.
+        $hash = new Hash('sha512');
+        $h = $hash->hash($str);
+        $h = substr($h, 0, 32);
+        // 2.  Prune the buffer: The lowest three bits of the first octet are
+        //     cleared, the highest bit of the last octet is cleared, and the
+        //     second highest bit of the last octet is set.
+        $h[0] = $h[0] & chr(0xF8);
+        $h = strrev($h);
+        $h[0] = ($h[0] & chr(0x3F)) | chr(0x40);
+        // 3.  Interpret the buffer as the little-endian integer, forming a
+        //     secret scalar s.
+        $dA = new BigInteger($h, 256);
+
+        return [
+            'dA' => $dA,
+            'secret' => $str
+        ];
+    }
+
+    /**
+     * Encode a point as a string
+     *
+     * @param array $point
+     * @return string
+     */
+    public function encodePoint($point)
+    {
+        list($x, $y) = $point;
+        $y = $y->toBytes();
+        $y[0] = $y[0] & chr(0x7F);
+        if ($x->isOdd()) {
+            $y[0] = $y[0] | chr(0x80);
+        }
+        $y = strrev($y);
+
+        return $y;
+    }
+
+    /**
+     * Creates a random scalar multiplier
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer
+     */
+    public function createRandomMultiplier()
+    {
+        return $this->extractSecret(Random::string(32))['dA'];
+    }
+
+    /**
+     * Converts an affine point to an extended homogeneous coordinate
+     *
+     * From https://tools.ietf.org/html/rfc8032#section-5.1.4 :
+     *
+     * A point (x,y) is represented in extended homogeneous coordinates (X, Y, Z, T),
+     * with x = X/Z, y = Y/Z, x * y = T/Z.
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToInternal(array $p)
+    {
+        if (empty($p)) {
+            return [clone $this->zero, clone $this->one, clone $this->one, clone $this->zero];
+        }
+
+        if (isset($p[2])) {
+            return $p;
+        }
+
+        $p[2] = clone $this->one;
+        $p[3] = $p[0]->multiply($p[1]);
+
+        return $p;
+    }
+
+    /**
+     * Doubles a point on a curve
+     *
+     * @return FiniteField[]
+     */
+    public function doublePoint(array $p)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p)) {
+            return [];
+        }
+
+        if (!isset($p[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        // from https://tools.ietf.org/html/rfc8032#page-12
+
+        list($x1, $y1, $z1, $t1) = $p;
+
+        $a = $x1->multiply($x1);
+        $b = $y1->multiply($y1);
+        $c = $this->two->multiply($z1)->multiply($z1);
+        $h = $a->add($b);
+        $temp = $x1->add($y1);
+        $e = $h->subtract($temp->multiply($temp));
+        $g = $a->subtract($b);
+        $f = $c->add($g);
+
+        $x3 = $e->multiply($f);
+        $y3 = $g->multiply($h);
+        $t3 = $e->multiply($h);
+        $z3 = $f->multiply($g);
+
+        return [$x3, $y3, $z3, $t3];
+    }
+
+    /**
+     * Adds two points on the curve
+     *
+     * @return FiniteField[]
+     */
+    public function addPoint(array $p, array $q)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p) || !count($q)) {
+            if (count($q)) {
+                return $q;
+            }
+            if (count($p)) {
+                return $p;
+            }
+            return [];
+        }
+
+        if (!isset($p[2]) || !isset($q[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        if ($p[0]->equals($q[0])) {
+            return !$p[1]->equals($q[1]) ? [] : $this->doublePoint($p);
+        }
+
+        // from https://tools.ietf.org/html/rfc8032#page-12
+
+        list($x1, $y1, $z1, $t1) = $p;
+        list($x2, $y2, $z2, $t2) = $q;
+
+        $a = $y1->subtract($x1)->multiply($y2->subtract($x2));
+        $b = $y1->add($x1)->multiply($y2->add($x2));
+        $c = $t1->multiply($this->two)->multiply($this->d)->multiply($t2);
+        $d = $z1->multiply($this->two)->multiply($z2);
+        $e = $b->subtract($a);
+        $f = $d->subtract($c);
+        $g = $d->add($c);
+        $h = $b->add($a);
+
+        $x3 = $e->multiply($f);
+        $y3 = $g->multiply($h);
+        $t3 = $e->multiply($h);
+        $z3 = $f->multiply($g);
+
+        return [$x3, $y3, $z3, $t3];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed448.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed448.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/Ed448.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,273 @@
+<?php
+
+/**
+ * Ed448
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Math\BigInteger;
+
+class Ed448 extends TwistedEdwards
+{
+    const HASH = 'shake256-912';
+    const SIZE = 57;
+
+    public function __construct()
+    {
+        // 2^448 - 2^224 - 1
+        $this->setModulo(new BigInteger(
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE' .
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(1),
+            // -39081
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE' .
+                           'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF6756', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('4F1970C66BED0DED221D15A622BF36DA9E146570470F1767EA6DE324' .
+                           'A3D3A46412AE1AF72AB66511433B80E18B00938E2626A82BC70CC05E', 16),
+            new BigInteger('693F46716EB6BC248876203756C9C7624BEA73736CA3984087789C1E' .
+                           '05A0C2D73AD3FF1CE67C39C4FDBD132C4ED7C8AD9808795BF230FA14', 16)
+        );
+        $this->setOrder(new BigInteger(
+            '3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+            '7CCA23E9C44EDB49AED63690216CC2728DC58F552378C292AB5844F3',
+            16
+        ));
+    }
+
+    /**
+     * Recover X from Y
+     *
+     * Implements steps 2-4 at https://tools.ietf.org/html/rfc8032#section-5.2.3
+     *
+     * Used by EC\Keys\Common.php
+     *
+     * @param BigInteger $y
+     * @param boolean $sign
+     * @return object[]
+     */
+    public function recoverX(BigInteger $y, $sign)
+    {
+        $y = $this->factory->newInteger($y);
+
+        $y2 = $y->multiply($y);
+        $u = $y2->subtract($this->one);
+        $v = $this->d->multiply($y2)->subtract($this->one);
+        $x2 = $u->divide($v);
+        if ($x2->equals($this->zero)) {
+            if ($sign) {
+                throw new \RuntimeException('Unable to recover X coordinate (x2 = 0)');
+            }
+            return clone $this->zero;
+        }
+        // find the square root
+        $exp = $this->getModulo()->add(new BigInteger(1));
+        $exp = $exp->bitwise_rightShift(2);
+        $x = $x2->pow($exp);
+
+        if (!$x->multiply($x)->subtract($x2)->equals($this->zero)) {
+            throw new \RuntimeException('Unable to recover X coordinate');
+        }
+        if ($x->isOdd() != $sign) {
+            $x = $x->negate();
+        }
+
+        return [$x, $y];
+    }
+
+    /**
+     * Extract Secret Scalar
+     *
+     * Implements steps 1-3 at https://tools.ietf.org/html/rfc8032#section-5.2.5
+     *
+     * Used by the various key handlers
+     *
+     * @param string $str
+     * @return array
+     */
+    public function extractSecret($str)
+    {
+        if (strlen($str) != 57) {
+            throw new \LengthException('Private Key should be 57-bytes long');
+        }
+        // 1.  Hash the 57-byte private key using SHAKE256(x, 114), storing the
+        //     digest in a 114-octet large buffer, denoted h.  Only the lower 57
+        //     bytes are used for generating the public key.
+        $hash = new Hash('shake256-912');
+        $h = $hash->hash($str);
+        $h = substr($h, 0, 57);
+        // 2.  Prune the buffer: The two least significant bits of the first
+        //     octet are cleared, all eight bits the last octet are cleared, and
+        //     the highest bit of the second to last octet is set.
+        $h[0] = $h[0] & chr(0xFC);
+        $h = strrev($h);
+        $h[0] = "\0";
+        $h[1] = $h[1] | chr(0x80);
+        // 3.  Interpret the buffer as the little-endian integer, forming a
+        //     secret scalar s.
+        $dA = new BigInteger($h, 256);
+
+        return [
+            'dA' => $dA,
+            'secret' => $str
+        ];
+
+        $dA->secret = $str;
+        return $dA;
+    }
+
+    /**
+     * Encode a point as a string
+     *
+     * @param array $point
+     * @return string
+     */
+    public function encodePoint($point)
+    {
+        list($x, $y) = $point;
+        $y = "\0" . $y->toBytes();
+        if ($x->isOdd()) {
+            $y[0] = $y[0] | chr(0x80);
+        }
+        $y = strrev($y);
+
+        return $y;
+    }
+
+    /**
+     * Creates a random scalar multiplier
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer
+     */
+    public function createRandomMultiplier()
+    {
+        return $this->extractSecret(Random::string(57))['dA'];
+    }
+
+    /**
+     * Converts an affine point to an extended homogeneous coordinate
+     *
+     * From https://tools.ietf.org/html/rfc8032#section-5.2.4 :
+     *
+     * A point (x,y) is represented in extended homogeneous coordinates (X, Y, Z, T),
+     * with x = X/Z, y = Y/Z, x * y = T/Z.
+     *
+     * @return \phpseclib3\Math\PrimeField\Integer[]
+     */
+    public function convertToInternal(array $p)
+    {
+        if (empty($p)) {
+            return [clone $this->zero, clone $this->one, clone $this->one];
+        }
+
+        if (isset($p[2])) {
+            return $p;
+        }
+
+        $p[2] = clone $this->one;
+
+        return $p;
+    }
+
+    /**
+     * Doubles a point on a curve
+     *
+     * @return FiniteField[]
+     */
+    public function doublePoint(array $p)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p)) {
+            return [];
+        }
+
+        if (!isset($p[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        // from https://tools.ietf.org/html/rfc8032#page-18
+
+        list($x1, $y1, $z1) = $p;
+
+        $b = $x1->add($y1);
+        $b = $b->multiply($b);
+        $c = $x1->multiply($x1);
+        $d = $y1->multiply($y1);
+        $e = $c->add($d);
+        $h = $z1->multiply($z1);
+        $j = $e->subtract($this->two->multiply($h));
+
+        $x3 = $b->subtract($e)->multiply($j);
+        $y3 = $c->subtract($d)->multiply($e);
+        $z3 = $e->multiply($j);
+
+        return [$x3, $y3, $z3];
+    }
+
+    /**
+     * Adds two points on the curve
+     *
+     * @return FiniteField[]
+     */
+    public function addPoint(array $p, array $q)
+    {
+        if (!isset($this->factory)) {
+            throw new \RuntimeException('setModulo needs to be called before this method');
+        }
+
+        if (!count($p) || !count($q)) {
+            if (count($q)) {
+                return $q;
+            }
+            if (count($p)) {
+                return $p;
+            }
+            return [];
+        }
+
+        if (!isset($p[2]) || !isset($q[2])) {
+            throw new \RuntimeException('Affine coordinates need to be manually converted to "Jacobi" coordinates or vice versa');
+        }
+
+        if ($p[0]->equals($q[0])) {
+            return !$p[1]->equals($q[1]) ? [] : $this->doublePoint($p);
+        }
+
+        // from https://tools.ietf.org/html/rfc8032#page-17
+
+        list($x1, $y1, $z1) = $p;
+        list($x2, $y2, $z2) = $q;
+
+        $a = $z1->multiply($z2);
+        $b = $a->multiply($a);
+        $c = $x1->multiply($x2);
+        $d = $y1->multiply($y2);
+        $e = $this->d->multiply($c)->multiply($d);
+        $f = $b->subtract($e);
+        $g = $b->add($e);
+        $h = $x1->add($y1)->multiply($x2->add($y2));
+
+        $x3 = $a->multiply($f)->multiply($h->subtract($c)->subtract($d));
+        $y3 = $a->multiply($g)->multiply($d->subtract($c));
+        $z3 = $f->multiply($g);
+
+        return [$x3, $y3, $z3];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP160r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP160r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('E95E4A5F737059DC60DFC7AD95B3D8139515620F', 16));
+        $this->setCoefficients(
+            new BigInteger('340E7BE2A280EB74E2BE61BADA745D97E8F7C300', 16),
+            new BigInteger('1E589A8595423412134FAA2DBDEC95C8D8675E58', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('BED5AF16EA3F6A4F62938C4631EB5AF7BDBCDBC3', 16),
+            new BigInteger('1667CB477A1A8EC338F94741669C976316DA6321', 16)
+        );
+        $this->setOrder(new BigInteger('E95E4A5F737059DC60DF5991D45029409E60FC09', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP160t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * brainpoolP160t1
+ *
+ * This curve is a twisted version of brainpoolP160r1 with A = -3. With brainpool,
+ * the curves ending in r1 are the "regular" curves and the curves ending in "t1"
+ * are the twisted version of the r1 curves. Per https://tools.ietf.org/html/rfc5639#page-7
+ * you can convert a point on an r1 curve to a point on a t1 curve thusly:
+ *
+ *     F(x,y) := (x*Z^2, y*Z^3)
+ *
+ * The advantage of A = -3 is that some of the point doubling and point addition can be
+ * slightly optimized. See http://hyperelliptic.org/EFD/g1p/auto-shortw-projective-3.html
+ * vs http://hyperelliptic.org/EFD/g1p/auto-shortw-projective.html for example.
+ *
+ * phpseclib does not currently take advantage of this optimization opportunity
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP160t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('E95E4A5F737059DC60DFC7AD95B3D8139515620F', 16));
+        $this->setCoefficients(
+            new BigInteger('E95E4A5F737059DC60DFC7AD95B3D8139515620C', 16), // eg. -3
+            new BigInteger('7A556B6DAE535B7B51ED2C4D7DAA7A0B5C55F380', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('B199B13B9B34EFC1397E64BAEB05ACC265FF2378', 16),
+            new BigInteger('ADD6718B7C7C1961F0991B842443772152C9E0AD', 16)
+        );
+        $this->setOrder(new BigInteger('E95E4A5F737059DC60DF5991D45029409E60FC09', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP192r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP192r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('C302F41D932A36CDA7A3463093D18DB78FCE476DE1A86297', 16));
+        $this->setCoefficients(
+            new BigInteger('6A91174076B1E0E19C39C031FE8685C1CAE040E5C69A28EF', 16),
+            new BigInteger('469A28EF7C28CCA3DC721D044F4496BCCA7EF4146FBF25C9', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('C0A0647EAAB6A48753B033C56CB0F0900A2F5C4853375FD6', 16),
+            new BigInteger('14B690866ABD5BB88B5F4828C1490002E6773FA2FA299B8F', 16)
+        );
+        $this->setOrder(new BigInteger('C302F41D932A36CDA7A3462F9E9E916B5BE8F1029AC4ACC1', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP192t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP192t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP192t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('C302F41D932A36CDA7A3463093D18DB78FCE476DE1A86297', 16));
+        $this->setCoefficients(
+            new BigInteger('C302F41D932A36CDA7A3463093D18DB78FCE476DE1A86294', 16), // eg. -3
+            new BigInteger('13D56FFAEC78681E68F9DEB43B35BEC2FB68542E27897B79', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('3AE9E58C82F63C30282E1FE7BBF43FA72C446AF6F4618129', 16),
+            new BigInteger('097E2C5667C2223A902AB5CA449D0084B7E5B3DE7CCC01C9', 16)
+        );
+        $this->setOrder(new BigInteger('C302F41D932A36CDA7A3462F9E9E916B5BE8F1029AC4ACC1', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP224r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP224r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('D7C134AA264366862A18302575D1D787B09F075797DA89F57EC8C0FF', 16));
+        $this->setCoefficients(
+            new BigInteger('68A5E62CA9CE6C1C299803A6C1530B514E182AD8B0042A59CAD29F43', 16),
+            new BigInteger('2580F63CCFE44138870713B1A92369E33E2135D266DBB372386C400B', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('0D9029AD2C7E5CF4340823B2A87DC68C9E4CE3174C1E6EFDEE12C07D', 16),
+            new BigInteger('58AA56F772C0726F24C6B89E4ECDAC24354B9E99CAA3F6D3761402CD', 16)
+        );
+        $this->setOrder(new BigInteger('D7C134AA264366862A18302575D0FB98D116BC4B6DDEBCA3A5A7939F', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP224t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP224t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP224t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('D7C134AA264366862A18302575D1D787B09F075797DA89F57EC8C0FF', 16));
+        $this->setCoefficients(
+            new BigInteger('D7C134AA264366862A18302575D1D787B09F075797DA89F57EC8C0FC', 16), // eg. -3
+            new BigInteger('4B337D934104CD7BEF271BF60CED1ED20DA14C08B3BB64F18A60888D', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('6AB1E344CE25FF3896424E7FFE14762ECB49F8928AC0C76029B4D580', 16),
+            new BigInteger('0374E9F5143E568CD23F3F4D7C0D4B1E41C8CC0D1C6ABD5F1A46DB4C', 16)
+        );
+        $this->setOrder(new BigInteger('D7C134AA264366862A18302575D0FB98D116BC4B6DDEBCA3A5A7939F', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP256r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP256r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('A9FB57DBA1EEA9BC3E660A909D838D726E3BF623D52620282013481D1F6E5377', 16));
+        $this->setCoefficients(
+            new BigInteger('7D5A0975FC2C3057EEF67530417AFFE7FB8055C126DC5C6CE94A4B44F330B5D9', 16),
+            new BigInteger('26DC5C6CE94A4B44F330B5D9BBD77CBF958416295CF7E1CE6BCCDC18FF8C07B6', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('8BD2AEB9CB7E57CB2C4B482FFC81B7AFB9DE27E1E3BD23C23A4453BD9ACE3262', 16),
+            new BigInteger('547EF835C3DAC4FD97F8461A14611DC9C27745132DED8E545C1D54C72F046997', 16)
+        );
+        $this->setOrder(new BigInteger('A9FB57DBA1EEA9BC3E660A909D838D718C397AA3B561A6F7901E0E82974856A7', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP256t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * brainpoolP256t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP256t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('A9FB57DBA1EEA9BC3E660A909D838D726E3BF623D52620282013481D1F6E5377', 16));
+        $this->setCoefficients(
+            new BigInteger('A9FB57DBA1EEA9BC3E660A909D838D726E3BF623D52620282013481D1F6E5374', 16), // eg. -3
+            new BigInteger('662C61C430D84EA4FE66A7733D0B76B7BF93EBC4AF2F49256AE58101FEE92B04', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('A3E8EB3CC1CFE7B7732213B23A656149AFA142C47AAFBC2B79A191562E1305F4', 16),
+            new BigInteger('2D996C823439C56D7F7B22E14644417E69BCB6DE39D027001DABE8F35B25C9BE', 16)
+        );
+        $this->setOrder(new BigInteger('A9FB57DBA1EEA9BC3E660A909D838D718C397AA3B561A6F7901E0E82974856A7', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * brainpoolP320r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP320r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('D35E472036BC4FB7E13C785ED201E065F98FCFA6F6F40DEF4F9' .
+                                        '2B9EC7893EC28FCD412B1F1B32E27', 16));
+        $this->setCoefficients(
+            new BigInteger('3EE30B568FBAB0F883CCEBD46D3F3BB8A2A73513F5EB79DA66190EB085FFA9F4' .
+                           '92F375A97D860EB4', 16),
+            new BigInteger('520883949DFDBC42D3AD198640688A6FE13F41349554B49ACC31DCCD88453981' .
+                           '6F5EB4AC8FB1F1A6', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('43BD7E9AFB53D8B85289BCC48EE5BFE6F20137D10A087EB6E7871E2A10A599C7' .
+                           '10AF8D0D39E20611', 16),
+            new BigInteger('14FDD05545EC1CC8AB4093247F77275E0743FFED117182EAA9C77877AAAC6AC7' .
+                           'D35245D1692E8EE1', 16)
+        );
+        $this->setOrder(new BigInteger('D35E472036BC4FB7E13C785ED201E065F98FCFA5B68F12A32D4' .
+                                       '82EC7EE8658E98691555B44C59311', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP320t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * brainpoolP320t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP320t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('D35E472036BC4FB7E13C785ED201E065F98FCFA6F6F40DEF4F9' .
+                                        '2B9EC7893EC28FCD412B1F1B32E27', 16));
+        $this->setCoefficients(
+            new BigInteger('D35E472036BC4FB7E13C785ED201E065F98FCFA6F6F40DEF4F92B9EC7893EC28' .
+                           'FCD412B1F1B32E24', 16), // eg. -3
+            new BigInteger('A7F561E038EB1ED560B3D147DB782013064C19F27ED27C6780AAF77FB8A547CE' .
+                           'B5B4FEF422340353', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('925BE9FB01AFC6FB4D3E7D4990010F813408AB106C4F09CB7EE07868CC136FFF' .
+                           '3357F624A21BED52', 16),
+            new BigInteger('63BA3A7A27483EBF6671DBEF7ABB30EBEE084E58A0B077AD42A5A0989D1EE71B' .
+                           '1B9BC0455FB0D2C3', 16)
+        );
+        $this->setOrder(new BigInteger('D35E472036BC4FB7E13C785ED201E065F98FCFA5B68F12A32D4' .
+                                       '82EC7EE8658E98691555B44C59311', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * brainpoolP384r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP384r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger(
+            '8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B412B1DA197FB71123ACD3A729901D1A7' .
+            '1874700133107EC53',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(
+                '7BC382C63D8C150C3C72080ACE05AFA0C2BEA28E4FB22787139165EFBA91F90F8AA5814A503' .
+                'AD4EB04A8C7DD22CE2826',
+                16
+            ),
+            new BigInteger(
+                '4A8C7DD22CE28268B39B55416F0447C2FB77DE107DCD2A62E880EA53EEB62D57CB4390295DB' .
+                'C9943AB78696FA504C11',
+                16
+            )
+        );
+        $this->setBasePoint(
+            new BigInteger(
+                '1D1C64F068CF45FFA2A63A81B7C13F6B8847A3E77EF14FE3DB7FCAFE0CBD10E8E826E03436D' .
+                '646AAEF87B2E247D4AF1E',
+                16
+            ),
+            new BigInteger(
+                '8ABE1D7520F9C2A45CB1EB8E95CFD55262B70B29FEEC5864E19C054FF99129280E464621779' .
+                '1811142820341263C5315',
+                16
+            )
+        );
+        $this->setOrder(new BigInteger(
+            '8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B31F166E6CAC0425A7CF3AB6AF6B7FC31' .
+            '03B883202E9046565',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP384t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * brainpoolP384t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP384t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger(
+            '8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B412B1DA197FB71123ACD3A729901D1A7' .
+            '1874700133107EC53',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(
+                '8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B412B1DA197FB71123ACD3A729901' .
+                'D1A71874700133107EC50',
+                16
+            ), // eg. -3
+            new BigInteger(
+                '7F519EADA7BDA81BD826DBA647910F8C4B9346ED8CCDC64E4B1ABD11756DCE1D2074AA263B8' .
+                '8805CED70355A33B471EE',
+                16
+            )
+        );
+        $this->setBasePoint(
+            new BigInteger(
+                '18DE98B02DB9A306F2AFCD7235F72A819B80AB12EBD653172476FECD462AABFFC4FF191B946' .
+                'A5F54D8D0AA2F418808CC',
+                16
+            ),
+            new BigInteger(
+                '25AB056962D30651A114AFD2755AD336747F93475B7A1FCA3B88F2B6A208CCFE469408584DC' .
+                '2B2912675BF5B9E582928',
+                16
+            )
+        );
+        $this->setOrder(new BigInteger(
+            '8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B31F166E6CAC0425A7CF3AB6AF6B7FC31' .
+            '03B883202E9046565',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * brainpoolP512r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP512r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger(
+            'AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA703308717D4D9B009BC' .
+            '66842AECDA12AE6A380E62881FF2F2D82C68528AA6056583A48F3',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(
+                '7830A3318B603B89E2327145AC234CC594CBDD8D3DF91610A83441CAEA9863BC2DED5D5AA82' .
+                '53AA10A2EF1C98B9AC8B57F1117A72BF2C7B9E7C1AC4D77FC94CA',
+                16
+            ),
+            new BigInteger(
+                '3DF91610A83441CAEA9863BC2DED5D5AA8253AA10A2EF1C98B9AC8B57F1117A72BF2C7B9E7C' .
+                '1AC4D77FC94CADC083E67984050B75EBAE5DD2809BD638016F723',
+                16
+            )
+        );
+        $this->setBasePoint(
+            new BigInteger(
+                '81AEE4BDD82ED9645A21322E9C4C6A9385ED9F70B5D916C1B43B62EEF4D0098EFF3B1F78E2D' .
+                '0D48D50D1687B93B97D5F7C6D5047406A5E688B352209BCB9F822',
+                16
+            ),
+            new BigInteger(
+                '7DDE385D566332ECC0EABFA9CF7822FDF209F70024A57B1AA000C55B881F8111B2DCDE494A5' .
+                'F485E5BCA4BD88A2763AED1CA2B2FA8F0540678CD1E0F3AD80892',
+                16
+            )
+        );
+        $this->setOrder(new BigInteger(
+            'AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA70330870553E5C414CA' .
+            '92619418661197FAC10471DB1D381085DDADDB58796829CA90069',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512t1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/brainpoolP512t1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * brainpoolP512t1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class brainpoolP512t1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger(
+            'AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA703308717D4D9B009BC' .
+            '66842AECDA12AE6A380E62881FF2F2D82C68528AA6056583A48F3',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(
+                'AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA703308717D4D9B009BC' .
+                '66842AECDA12AE6A380E62881FF2F2D82C68528AA6056583A48F0',
+                16
+            ), // eg. -3
+            new BigInteger(
+                '7CBBBCF9441CFAB76E1890E46884EAE321F70C0BCB4981527897504BEC3E36A62BCDFA23049' .
+                '76540F6450085F2DAE145C22553B465763689180EA2571867423E',
+                16
+            )
+        );
+        $this->setBasePoint(
+            new BigInteger(
+                '640ECE5C12788717B9C1BA06CBC2A6FEBA85842458C56DDE9DB1758D39C0313D82BA51735CD' .
+                'B3EA499AA77A7D6943A64F7A3F25FE26F06B51BAA2696FA9035DA',
+                16
+            ),
+            new BigInteger(
+                '5B534BD595F5AF0FA2C892376C84ACE1BB4E3019B71634C01131159CAE03CEE9D9932184BEE' .
+                'F216BD71DF2DADF86A627306ECFF96DBB8BACE198B61E00F8B332',
+                16
+            )
+        );
+        $this->setOrder(new BigInteger(
+            'AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA70330870553E5C414CA' .
+            '92619418661197FAC10471DB1D381085DDADDB58796829CA90069',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb233.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb233.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb233.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistb233
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistb233 extends sect233r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb409.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb409.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistb409.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistb409
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistb409 extends sect409r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk163.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk163.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk163.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistk163
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistk163 extends sect163k1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk233.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk233.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk233.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistk233
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistk233 extends sect233k1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk283.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk283.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk283.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * sect283k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistk283 extends sect283k1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk409.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk409.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistk409.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistk409
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistk409 extends sect409k1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp192.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp192.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp192.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistp192
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistp192 extends secp192r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp224.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp224.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp224.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistp224
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistp224 extends secp224r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp256.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp256.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp256.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistp256
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistp256 extends secp256r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp384.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp384.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp384.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistp384
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistp384 extends secp384r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp521.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp521.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistp521.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistp521
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistp521 extends secp521r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistt571.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistt571.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/nistt571.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * nistt571
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class nistt571 extends sect571k1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * prime192v1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class prime192v1 extends secp192r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * prime192v2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class prime192v2 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC', 16),
+            new BigInteger('CC22D6DFB95C6B25E49C0D6364A4E5980C393AA21668D953', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('EEA2BAE7E1497842F2DE7769CFE9C989C072AD696F48034A', 16),
+            new BigInteger('6574D11D69B6EC7A672BB82A083DF2F2B0847DE970B2DE15', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFE5FB1A724DC80418648D8DD31', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v3.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v3.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime192v3.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * prime192v3
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class prime192v3 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC', 16),
+            new BigInteger('22123DC2395A05CAA7423DAECCC94760A7D462256BD56916', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('7D29778100C65A1DA1783716588DCE2B8B4AEE8E228F1896', 16),
+            new BigInteger('38A90F22637337334B49DCB66A6DC8F9978ACA7648A943B0', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFF7A62D031C83F4294F640EC13', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * prime239v1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class prime239v1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFC', 16),
+            new BigInteger('6B016C3BDCF18941D0D654921475CA71A9DB2FB27D1D37796185C2942C0A', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('0FFA963CDCA8816CCC33B8642BEDF905C3D358573D3F27FBBD3B3CB9AAAF', 16),
+            new BigInteger('7DEBE8E4E90A5DAE6E4054CA530BA04654B36818CE226B39FCCB7B02F1AE', 16)
+        );
+        $this->setOrder(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFF9E5E9A9F5D9071FBD1522688909D0B', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * prime239v2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class prime239v2 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFC', 16),
+            new BigInteger('617FAB6832576CBBFED50D99F0249C3FEE58B94BA0038C7AE84C8C832F2C', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('38AF09D98727705120C921BB5E9E26296A3CDCF2F35757A0EAFD87B830E7', 16),
+            new BigInteger('5B0125E4DBEA0EC7206DA0FC01D9B081329FB555DE6EF460237DFF8BE4BA', 16)
+        );
+        $this->setOrder(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF800000CFA7E8594377D414C03821BC582063', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v3.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v3.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime239v3.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * prime239v3
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class prime239v3 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFF8000000000007FFFFFFFFFFC', 16),
+            new BigInteger('255705FA2A306654B1F4CB03D6A750A30C250102D4988717D9BA15AB6D3E', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('6768AE8E18BB92CFCF005C949AA2C6D94853D0E660BBF854B1C9505FE95A', 16),
+            new BigInteger('1607E6898F390C06BC1D552BAD226F3B6FCFE48B6E818499AF18E3ED6CF3', 16)
+        );
+        $this->setOrder(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFF7FFFFF975DEB41B3A6057C3C432146526551', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime256v1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime256v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/prime256v1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * prime256v1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+final class prime256v1 extends secp256r1
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * secp112r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp112r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('DB7C2ABF62E35E668076BEAD208B', 16));
+        $this->setCoefficients(
+            new BigInteger('DB7C2ABF62E35E668076BEAD2088', 16),
+            new BigInteger('659EF8BA043916EEDE8911702B22', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('09487239995A5EE76B55F9C2F098', 16),
+            new BigInteger('A89CE5AF8724C0A23E0E0FF77500', 16)
+        );
+        $this->setOrder(new BigInteger('DB7C2ABF62E35E7628DFAC6561C5', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp112r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * secp112r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp112r2 extends Prime
+{
+    public function __construct()
+    {
+        // same modulo as secp112r1
+        $this->setModulo(new BigInteger('DB7C2ABF62E35E668076BEAD208B', 16));
+        $this->setCoefficients(
+            new BigInteger('6127C24C05F38A0AAAF65C0EF02C', 16),
+            new BigInteger('51DEF1815DB5ED74FCC34C85D709', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('4BA30AB5E892B4E1649DD0928643', 16),
+            new BigInteger('ADCD46F5882E3747DEF36E956E97', 16)
+        );
+        $this->setOrder(new BigInteger('36DF0AAFD8B8D7597CA10520D04B', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * secp128r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp128r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFC', 16),
+            new BigInteger('E87579C11079F43DD824993C2CEE5ED3', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('161FF7528B899B2D0C28607CA52C5B86', 16),
+            new BigInteger('CF5AC8395BAFEB13C02DA292DDED7A83', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFE0000000075A30D1B9038A115', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp128r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * secp128r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp128r2 extends Prime
+{
+    public function __construct()
+    {
+        // same as secp128r1
+        $this->setModulo(new BigInteger('FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('D6031998D1B3BBFEBF59CC9BBFF9AEE1', 16),
+            new BigInteger('5EEEFCA380D02919DC2C6558BB6D8A5D', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('7B6AA5D85E572983E6FB32A7CDEBC140', 16),
+            new BigInteger('27B6916A894D3AEE7106FE805FC34B44', 16)
+        );
+        $this->setOrder(new BigInteger('3FFFFFFF7FFFFFFFBE0024720613B5A3', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * secp160k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
+use phpseclib3\Math\BigInteger;
+
+class secp160k1 extends KoblitzPrime
+{
+    public function __construct()
+    {
+        // same as secp160r2
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73', 16));
+        $this->setCoefficients(
+            new BigInteger('0000000000000000000000000000000000000000', 16),
+            new BigInteger('0000000000000000000000000000000000000007', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('3B4C382CE37AA192A4019E763036F4F5DD4D7EBB', 16),
+            new BigInteger('938CF935318FDCED6BC28286531733C3F03C4FEE', 16)
+        );
+        $this->setOrder(new BigInteger('0100000000000000000001B8FA16DFAB9ACA16B6B3', 16));
+
+        $this->basis = [];
+        $this->basis[] = [
+            'a' => new BigInteger('0096341F1138933BC2F505', -16),
+            'b' => new BigInteger('FF6E9D0418C67BB8D5F562', -16)
+        ];
+        $this->basis[] = [
+            'a' => new BigInteger('01BDCB3A09AAAABEAFF4A8', -16),
+            'b' => new BigInteger('04D12329FF0EF498EA67', -16)
+        ];
+        $this->beta = $this->factory->newInteger(new BigInteger('645B7345A143464942CC46D7CF4D5D1E1E6CBB68', -16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * secp160r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp160r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFC', 16),
+            new BigInteger('1C97BEFC54BD7A8B65ACF89F81D4D4ADC565FA45', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('4A96B5688EF573284664698968C38BB913CBFC82', 16),
+            new BigInteger('23A628553168947D59DCC912042351377AC5FB32', 16)
+        );
+        $this->setOrder(new BigInteger('0100000000000000000001F4C8F927AED3CA752257', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp160r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * secp160r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp160r2 extends Prime
+{
+    public function __construct()
+    {
+        // same as secp160k1
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC70', 16),
+            new BigInteger('B4E134D3FB59EB8BAB57274904664D5AF50388BA', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('52DCB034293A117E1F4FF11B30F7199D3144CE6D', 16),
+            new BigInteger('FEAFFEF2E331F296E071FA0DF9982CFEA7D43F2E', 16)
+        );
+        $this->setOrder(new BigInteger('0100000000000000000000351EE786A818F3A1A16B', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * secp192k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
+use phpseclib3\Math\BigInteger;
+
+class secp192k1 extends KoblitzPrime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFEE37', 16));
+        $this->setCoefficients(
+            new BigInteger('000000000000000000000000000000000000000000000000', 16),
+            new BigInteger('000000000000000000000000000000000000000000000003', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('DB4FF10EC057E9AE26B07D0280B7F4341DA5D1B1EAE06C7D', 16),
+            new BigInteger('9B2F2F6D9C5628A7844163D015BE86344082AA88D95E2F9D', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFE26F2FC170F69466A74DEFD8D', 16));
+
+        $this->basis = [];
+        $this->basis[] = [
+            'a' => new BigInteger('00B3FB3400DEC5C4ADCEB8655C', -16),
+            'b' => new BigInteger('8EE96418CCF4CFC7124FDA0F', -16)
+        ];
+        $this->basis[] = [
+            'a' => new BigInteger('01D90D03E8F096B9948B20F0A9', -16),
+            'b' => new BigInteger('42E49819ABBA9474E1083F6B', -16)
+        ];
+        $this->beta = $this->factory->newInteger(new BigInteger('447A96E6C647963E2F7809FEAAB46947F34B0AA3CA0BBA74', -16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp192r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * secp192r1
+ *
+ * This is the NIST P-192 curve
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp192r1 extends Prime
+{
+    public function __construct()
+    {
+        $modulo = new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF', 16);
+        $this->setModulo($modulo);
+
+        // algorithm 2.27 from http://diamond.boisestate.edu/~liljanab/MATH308/GuideToECC.pdf#page=66
+        /* in theory this should be faster than regular modular reductions save for one small issue.
+           to convert to / from base-2**8 with BCMath you have to call bcmul() and bcdiv() a lot.
+           to convert to / from base-2**8 with PHP64 you have to call base256_rshift() a lot.
+           in short, converting to / from base-2**8 is pretty expensive and that expense is
+           enough to offset whatever else might be gained by a simplified reduction algorithm.
+           now, if PHP supported unsigned integers things might be different. no bit-shifting
+           would be required for the PHP engine and it'd be a lot faster. but as is, BigInteger
+           uses base-2**31 or base-2**26 depending on whether or not the system is has a 32-bit
+           or a 64-bit OS.
+        */
+        /*
+        $m_length = $this->getLengthInBytes();
+        $this->setReduction(function($c) use ($m_length) {
+            $cBytes = $c->toBytes();
+            $className = $this->className;
+
+            if (strlen($cBytes) > 2 * $m_length) {
+                list(, $r) = $c->divide($className::$modulo);
+                return $r;
+            }
+
+            $c = str_pad($cBytes, 48, "\0", STR_PAD_LEFT);
+            $c = array_reverse(str_split($c, 8));
+
+            $null = "\0\0\0\0\0\0\0\0";
+            $s1 = new BigInteger($c[2] . $c[1] . $c[0], 256);
+            $s2 = new BigInteger($null . $c[3] . $c[3], 256);
+            $s3 = new BigInteger($c[4] . $c[4] . $null, 256);
+            $s4 = new BigInteger($c[5] . $c[5] . $c[5], 256);
+
+            $r = $s1->add($s2)->add($s3)->add($s4);
+            while ($r->compare($className::$modulo) >= 0) {
+                $r = $r->subtract($className::$modulo);
+            }
+
+            return $r;
+        });
+        */
+
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC', 16),
+            new BigInteger('64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012', 16),
+            new BigInteger('07192B95FFC8DA78631011ED6B24CDD573F977A11E794811', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * secp224k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
+use phpseclib3\Math\BigInteger;
+
+class secp224k1 extends KoblitzPrime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFE56D', 16));
+        $this->setCoefficients(
+            new BigInteger('00000000000000000000000000000000000000000000000000000000', 16),
+            new BigInteger('00000000000000000000000000000000000000000000000000000005', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('A1455B334DF099DF30FC28A169A467E9E47075A90F7E650EB6B7A45C', 16),
+            new BigInteger('7E089FED7FBA344282CAFBD6F7E319F7C0B0BD59E2CA4BDB556D61A5', 16)
+        );
+        $this->setOrder(new BigInteger('010000000000000000000000000001DCE8D2EC6184CAF0A971769FB1F7', 16));
+
+        $this->basis = [];
+        $this->basis[] = [
+            'a' => new BigInteger('00B8ADF1378A6EB73409FA6C9C637D', -16),
+            'b' => new BigInteger('94730F82B358A3776A826298FA6F', -16)
+        ];
+        $this->basis[] = [
+            'a' => new BigInteger('01DCE8D2EC6184CAF0A972769FCC8B', -16),
+            'b' => new BigInteger('4D2100BA3DC75AAB747CCF355DEC', -16)
+        ];
+        $this->beta = $this->factory->newInteger(new BigInteger('01F178FFA4B17C89E6F73AECE2AAD57AF4C0A748B63C830947B27E04', -16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp224r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * secp224r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp224r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE', 16),
+            new BigInteger('B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21', 16),
+            new BigInteger('BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * secp256k1
+ *
+ * This is the curve used in Bitcoin
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+//use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Crypt\EC\BaseCurves\KoblitzPrime;
+use phpseclib3\Math\BigInteger;
+
+//class secp256k1 extends Prime
+class secp256k1 extends KoblitzPrime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F', 16));
+        $this->setCoefficients(
+            new BigInteger('0000000000000000000000000000000000000000000000000000000000000000', 16),
+            new BigInteger('0000000000000000000000000000000000000000000000000000000000000007', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16));
+        $this->setBasePoint(
+            new BigInteger('79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798', 16),
+            new BigInteger('483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8', 16)
+        );
+
+        $this->basis = [];
+        $this->basis[] = [
+            'a' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16),
+            'b' => new BigInteger('FF1BBC8129FEF177D790AB8056F5401B3D', -16)
+        ];
+        $this->basis[] = [
+            'a' => new BigInteger('114CA50F7A8E2F3F657C1108D9D44CFD8', -16),
+            'b' => new BigInteger('3086D221A7D46BCDE86C90E49284EB15', -16)
+        ];
+        $this->beta = $this->factory->newInteger(new BigInteger('7AE96A2B657C07106E64479EAC3434E99CF0497512F58995C1396C28719501EE', -16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp256r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * secp256r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp256r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC', 16),
+            new BigInteger('5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296', 16),
+            new BigInteger('4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5', 16)
+        );
+        $this->setOrder(new BigInteger('FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp384r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp384r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp384r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * secp384r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp384r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger(
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF',
+            16
+        ));
+        $this->setCoefficients(
+            new BigInteger(
+                'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFC',
+                16
+            ),
+            new BigInteger(
+                'B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE8141120314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF',
+                16
+            )
+        );
+        $this->setBasePoint(
+            new BigInteger(
+                'AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B9859F741E082542A385502F25DBF55296C3A545E3872760AB7',
+                16
+            ),
+            new BigInteger(
+                '3617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A147CE9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F',
+                16
+            )
+        );
+        $this->setOrder(new BigInteger(
+            'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp521r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp521r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/secp521r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * secp521r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Prime;
+use phpseclib3\Math\BigInteger;
+
+class secp521r1 extends Prime
+{
+    public function __construct()
+    {
+        $this->setModulo(new BigInteger('01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+                                        'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+                                        'FFFF', 16));
+        $this->setCoefficients(
+            new BigInteger('01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+                           'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+                           'FFFC', 16),
+            new BigInteger('0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF1' .
+                           '09E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B50' .
+                           '3F00', 16)
+        );
+        $this->setBasePoint(
+            new BigInteger('00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D' .
+                           '3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5' .
+                           'BD66', 16),
+            new BigInteger('011839296A789A3BC0045C8A5FB42C7D1BD998F54449579B446817AFBD17273E' .
+                           '662C97EE72995EF42640C550B9013FAD0761353C7086A272C24088BE94769FD1' .
+                           '6650', 16)
+        );
+        $this->setOrder(new BigInteger('01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+                                       'FFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E9138' .
+                                       '6409', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect113r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect113r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(113, 9, 0);
+        $this->setCoefficients(
+            '003088250CA6E7C7FE649CE85820F7',
+            '00E8BEE4D3E2260744188BE0E9C723'
+        );
+        $this->setBasePoint(
+            '009D73616F35F4AB1407D73562C10F',
+            '00A52830277958EE84D1315ED31886'
+        );
+        $this->setOrder(new BigInteger('0100000000000000D9CCEC8A39E56F', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect113r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect113r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect113r2 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(113, 9, 0);
+        $this->setCoefficients(
+            '00689918DBEC7E5A0DD6DFC0AA55C7',
+            '0095E9A9EC9B297BD4BF36E059184F'
+        );
+        $this->setBasePoint(
+            '01A57A6A7B26CA5EF52FCDB8164797',
+            '00B3ADC94ED1FE674C06E695BABA1D'
+        );
+        $this->setOrder(new BigInteger('010000000000000108789B2496AF93', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect131r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect131r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(131, 8, 3, 2, 0);
+        $this->setCoefficients(
+            '07A11B09A76B562144418FF3FF8C2570B8',
+            '0217C05610884B63B9C6C7291678F9D341'
+        );
+        $this->setBasePoint(
+            '0081BAF91FDF9833C40F9C181343638399',
+            '078C6E7EA38C001F73C8134B1B4EF9E150'
+        );
+        $this->setOrder(new BigInteger('0400000000000000023123953A9464B54D', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect131r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect131r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect131r2 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(131, 8, 3, 2, 0);
+        $this->setCoefficients(
+            '03E5A88919D7CAFCBF415F07C2176573B2',
+            '04B8266A46C55657AC734CE38F018F2192'
+        );
+        $this->setBasePoint(
+            '0356DCD8F2F95031AD652D23951BB366A8',
+            '0648F06D867940A5366D9E265DE9EB240F'
+        );
+        $this->setOrder(new BigInteger('0400000000000000016954A233049BA98F', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect163k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect163k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(163, 7, 6, 3, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000001',
+            '000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '02FE13C0537BBC11ACAA07D793DE4E6D5E5C94EEE8',
+            '0289070FB05D38FF58321F2E800536D538CCDAA3D9'
+        );
+        $this->setOrder(new BigInteger('04000000000000000000020108A2E0CC0D99F8A5EF', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect163r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect163r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(163, 7, 6, 3, 0);
+        $this->setCoefficients(
+            '07B6882CAAEFA84F9554FF8428BD88E246D2782AE2',
+            '0713612DCDDCB40AAB946BDA29CA91F73AF958AFD9'
+        );
+        $this->setBasePoint(
+            '0369979697AB43897789566789567F787A7876A654',
+            '00435EDB42EFAFB2989D51FEFCE3C80988F41FF883'
+        );
+        $this->setOrder(new BigInteger('03FFFFFFFFFFFFFFFFFFFF48AAB689C29CA710279B', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect163r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect163r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect163r2 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(163, 7, 6, 3, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000001',
+            '020A601907B8C953CA1481EB10512F78744A3205FD'
+        );
+        $this->setBasePoint(
+            '03F0EBA16286A2D57EA0991168D4994637E8343E36',
+            '00D51FBC6C71A0094FA2CDD545B11C5C0C797324F1'
+        );
+        $this->setOrder(new BigInteger('040000000000000000000292FE77E70C12A4234C33', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect193r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect193r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(193, 15, 0);
+        $this->setCoefficients(
+            '0017858FEB7A98975169E171F77B4087DE098AC8A911DF7B01',
+            '00FDFB49BFE6C3A89FACADAA7A1E5BBC7CC1C2E5D831478814'
+        );
+        $this->setBasePoint(
+            '01F481BC5F0FF84A74AD6CDF6FDEF4BF6179625372D8C0C5E1',
+            '0025E399F2903712CCF3EA9E3A1AD17FB0B3201B6AF7CE1B05'
+        );
+        $this->setOrder(new BigInteger('01000000000000000000000000C7F34A778F443ACC920EBA49', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect193r2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect193r2
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect193r2 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(193, 15, 0);
+        $this->setCoefficients(
+            '0163F35A5137C2CE3EA6ED8667190B0BC43ECD69977702709B',
+            '00C9BB9E8927D4D64C377E2AB2856A5B16E3EFB7F61D4316AE'
+        );
+        $this->setBasePoint(
+            '00D9B67D192E0367C803F39E1A7E82CA14A651350AAE617E8F',
+            '01CE94335607C304AC29E7DEFBD9CA01F596F927224CDECF6C'
+        );
+        $this->setOrder(new BigInteger('010000000000000000000000015AAB561B005413CCD4EE99D5', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect233k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect233k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(233, 74, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000',
+            '000000000000000000000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '017232BA853A7E731AF129F22FF4149563A419C26BF50A4C9D6EEFAD6126',
+            '01DB537DECE819B7F70F555A67C427A8CD9BF18AEB9B56E0C11056FAE6A3'
+        );
+        $this->setOrder(new BigInteger('8000000000000000000000000000069D5BB915BCD46EFB1AD5F173ABDF', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect233r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect233r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect233r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(233, 74, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000001',
+            '0066647EDE6C332C7F8C0923BB58213B333B20E9CE4281FE115F7D8F90AD'
+        );
+        $this->setBasePoint(
+            '00FAC9DFCBAC8313BB2139F1BB755FEF65BC391F8B36F8F8EB7371FD558B',
+            '01006A08A41903350678E58528BEBF8A0BEFF867A7CA36716F7E01F81052'
+        );
+        $this->setOrder(new BigInteger('01000000000000000000000000000013E974E72F8A6922031D2603CFE0D7', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect239k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect239k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect239k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect239k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect239k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(239, 158, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000',
+            '000000000000000000000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '29A0B6A887A983E9730988A68727A8B2D126C44CC2CC7B2A6555193035DC',
+            '76310804F12E549BDB011C103089E73510ACB275FC312A5DC6B76553F0CA'
+        );
+        $this->setOrder(new BigInteger('2000000000000000000000000000005A79FEC67CB6E91F1C1DA800E478A5', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect283k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect283k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(283, 12, 7, 5, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000000000000000',
+            '000000000000000000000000000000000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '0503213F78CA44883F1A3B8162F188E553CD265F23C1567A16876913B0C2AC2458492836',
+            '01CCDA380F1C9E318D90F95D07E5426FE87E45C0E8184698E45962364E34116177DD2259'
+        );
+        $this->setOrder(new BigInteger('01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE9AE2ED07577265DFF7F94451E061E163C61', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect283r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * sect283r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect283r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(283, 12, 7, 5, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000000000000001',
+            '027B680AC8B8596DA5A4AF8A19A0303FCA97FD7645309FA2A581485AF6263E313B79A2F5'
+        );
+        $this->setBasePoint(
+            '05F939258DB7DD90E1934F8C70B0DFEC2EED25B8557EAC9C80E2E198F8CDBECD86B12053',
+            '03676854FE24141CB98FE6D4B20D02B4516FF702350EDDB0826779C813F0DF45BE8112F4'
+        );
+        $this->setOrder(new BigInteger('03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF90399660FC938A90165B042A7CEFADB307', 16));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * sect409k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect409k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(409, 87, 0);
+        $this->setCoefficients(
+            '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
+            '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '0060F05F658F49C1AD3AB1890F7184210EFD0987E307C84C27ACCFB8F9F67CC2C460189EB5AAAA62EE222EB1B35540CFE9023746',
+            '01E369050B7C4E42ACBA1DACBF04299C3460782F918EA427E6325165E9EA10E3DA5F6C42E9C55215AA9CA27A5863EC48D8E0286B'
+        );
+        $this->setOrder(new BigInteger(
+            '7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE5F' .
+            '83B2D4EA20400EC4557D5ED3E3E7CA5B4B5C83B8E01E5FCF',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect409r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * sect409r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect409r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(409, 87, 0);
+        $this->setCoefficients(
+            '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001',
+            '0021A5C2C8EE9FEB5C4B9A753B7B476B7FD6422EF1F3DD674761FA99D6AC27C8A9A197B272822F6CD57A55AA4F50AE317B13545F'
+        );
+        $this->setBasePoint(
+            '015D4860D088DDB3496B0C6064756260441CDE4AF1771D4DB01FFE5B34E59703DC255A868A1180515603AEAB60794E54BB7996A7',
+            '0061B1CFAB6BE5F32BBFA78324ED106A7636B9C5A7BD198D0158AA4F5488D08F38514F1FDF4B4F40D2181B3681C364BA0273C706'
+        );
+        $this->setOrder(new BigInteger(
+            '010000000000000000000000000000000000000000000000000001E2' .
+            'AAD6A612F33307BE5FA47C3C9E052F838164CD37D9A21173',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571k1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571k1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * sect571k1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect571k1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(571, 10, 5, 2, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000000000000000' .
+            '000000000000000000000000000000000000000000000000000000000000000000000000',
+            '000000000000000000000000000000000000000000000000000000000000000000000000' .
+            '000000000000000000000000000000000000000000000000000000000000000000000001'
+        );
+        $this->setBasePoint(
+            '026EB7A859923FBC82189631F8103FE4AC9CA2970012D5D46024804801841CA443709584' .
+            '93B205E647DA304DB4CEB08CBBD1BA39494776FB988B47174DCA88C7E2945283A01C8972',
+            '0349DC807F4FBF374F4AEADE3BCA95314DD58CEC9F307A54FFC61EFC006D8A2C9D4979C0' .
+            'AC44AEA74FBEBBB9F772AEDCB620B01A7BA7AF1B320430C8591984F601CD4C143EF1C7A3'
+        );
+        $this->setOrder(new BigInteger(
+            '020000000000000000000000000000000000000000000000000000000000000000000000' .
+            '131850E1F19A63E4B391A8DB917F4138B630D84BE5D639381E91DEB45CFE778F637C1001',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571r1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Curves/sect571r1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * sect571r1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wiggint  on <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Crypt\EC\Curves;
+
+use phpseclib3\Crypt\EC\BaseCurves\Binary;
+use phpseclib3\Math\BigInteger;
+
+class sect571r1 extends Binary
+{
+    public function __construct()
+    {
+        $this->setModulo(571, 10, 5, 2, 0);
+        $this->setCoefficients(
+            '000000000000000000000000000000000000000000000000000000000000000000000000' .
+            '000000000000000000000000000000000000000000000000000000000000000000000001',
+            '02F40E7E2221F295DE297117B7F3D62F5C6A97FFCB8CEFF1CD6BA8CE4A9A18AD84FFABBD' .
+            '8EFA59332BE7AD6756A66E294AFD185A78FF12AA520E4DE739BACA0C7FFEFF7F2955727A'
+        );
+        $this->setBasePoint(
+            '0303001D34B856296C16C0D40D3CD7750A93D1D2955FA80AA5F40FC8DB7B2ABDBDE53950' .
+            'F4C0D293CDD711A35B67FB1499AE60038614F1394ABFA3B4C850D927E1E7769C8EEC2D19',
+            '037BF27342DA639B6DCCFFFEB73D69D78C6C27A6009CBBCA1980F8533921E8A684423E43' .
+            'BAB08A576291AF8F461BB2A8B3531D2F0485C19B16E2F1516E23DD3C1A4827AF1B8AC15B'
+        );
+        $this->setOrder(new BigInteger(
+            '03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
+            'E661CE18FF55987308059B186823851EC7DD9CA1161DE93D5174D66E8382E9BB2FE84E47',
+            16
+        ));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/Common.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/Common.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/Common.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,549 @@
+<?php
+
+/**
+ * Generic EC Key Parsing Helper functions
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Binary as BinaryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Prime as PrimeCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Generic EC Key Parsing Helper functions
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+trait Common
+{
+    /**
+     * Curve OIDs
+     *
+     * @var array
+     */
+    private static $curveOIDs = [];
+
+    /**
+     * Child OIDs loaded
+     *
+     * @var bool
+     */
+    protected static $childOIDsLoaded = false;
+
+    /**
+     * Use Named Curves
+     *
+     * @var bool
+     */
+    private static $useNamedCurves = true;
+
+    /**
+     * Initialize static variables
+     */
+    private static function initialize_static_variables()
+    {
+        if (empty(self::$curveOIDs)) {
+            // the sec* curves are from the standards for efficient cryptography group
+            // sect* curves are curves over binary finite fields
+            // secp* curves are curves over prime finite fields
+            // sec*r* curves are regular curves; sec*k* curves are koblitz curves
+            // brainpool*r* curves are regular prime finite field curves
+            // brainpool*t* curves are twisted versions of the brainpool*r* curves
+            self::$curveOIDs = [
+                'prime192v1' => '1.2.840.10045.3.1.1', // J.5.1, example 1 (aka secp192r1)
+                'prime192v2' => '1.2.840.10045.3.1.2', // J.5.1, example 2
+                'prime192v3' => '1.2.840.10045.3.1.3', // J.5.1, example 3
+                'prime239v1' => '1.2.840.10045.3.1.4', // J.5.2, example 1
+                'prime239v2' => '1.2.840.10045.3.1.5', // J.5.2, example 2
+                'prime239v3' => '1.2.840.10045.3.1.6', // J.5.2, example 3
+                'prime256v1' => '1.2.840.10045.3.1.7', // J.5.3, example 1 (aka secp256r1)
+
+                // https://tools.ietf.org/html/rfc5656#section-10
+                'nistp256' => '1.2.840.10045.3.1.7', // aka secp256r1
+                'nistp384' => '1.3.132.0.34', // aka secp384r1
+                'nistp521' => '1.3.132.0.35', // aka secp521r1
+
+                'nistk163' => '1.3.132.0.1', // aka sect163k1
+                'nistp192' => '1.2.840.10045.3.1.1', // aka secp192r1
+                'nistp224' => '1.3.132.0.33', // aka secp224r1
+                'nistk233' => '1.3.132.0.26', // aka sect233k1
+                'nistb233' => '1.3.132.0.27', // aka sect233r1
+                'nistk283' => '1.3.132.0.16', // aka sect283k1
+                'nistk409' => '1.3.132.0.36', // aka sect409k1
+                'nistb409' => '1.3.132.0.37', // aka sect409r1
+                'nistt571' => '1.3.132.0.38', // aka sect571k1
+
+                // from https://tools.ietf.org/html/rfc5915
+                'secp192r1' => '1.2.840.10045.3.1.1', // aka prime192v1
+                'sect163k1' => '1.3.132.0.1',
+                'sect163r2' => '1.3.132.0.15',
+                'secp224r1' => '1.3.132.0.33',
+                'sect233k1' => '1.3.132.0.26',
+                'sect233r1' => '1.3.132.0.27',
+                'secp256r1' => '1.2.840.10045.3.1.7', // aka prime256v1
+                'sect283k1' => '1.3.132.0.16',
+                'sect283r1' => '1.3.132.0.17',
+                'secp384r1' => '1.3.132.0.34',
+                'sect409k1' => '1.3.132.0.36',
+                'sect409r1' => '1.3.132.0.37',
+                'secp521r1' => '1.3.132.0.35',
+                'sect571k1' => '1.3.132.0.38',
+                'sect571r1' => '1.3.132.0.39',
+                // from http://www.secg.org/SEC2-Ver-1.0.pdf
+                'secp112r1' => '1.3.132.0.6',
+                'secp112r2' => '1.3.132.0.7',
+                'secp128r1' => '1.3.132.0.28',
+                'secp128r2' => '1.3.132.0.29',
+                'secp160k1' => '1.3.132.0.9',
+                'secp160r1' => '1.3.132.0.8',
+                'secp160r2' => '1.3.132.0.30',
+                'secp192k1' => '1.3.132.0.31',
+                'secp224k1' => '1.3.132.0.32',
+                'secp256k1' => '1.3.132.0.10',
+
+                'sect113r1' => '1.3.132.0.4',
+                'sect113r2' => '1.3.132.0.5',
+                'sect131r1' => '1.3.132.0.22',
+                'sect131r2' => '1.3.132.0.23',
+                'sect163r1' => '1.3.132.0.2',
+                'sect193r1' => '1.3.132.0.24',
+                'sect193r2' => '1.3.132.0.25',
+                'sect239k1' => '1.3.132.0.3',
+
+                // from http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.202.2977&rep=rep1&type=pdf#page=36
+                /*
+                'c2pnb163v1' => '1.2.840.10045.3.0.1', // J.4.1, example 1
+                'c2pnb163v2' => '1.2.840.10045.3.0.2', // J.4.1, example 2
+                'c2pnb163v3' => '1.2.840.10045.3.0.3', // J.4.1, example 3
+                'c2pnb172w1' => '1.2.840.10045.3.0.4', // J.4.2, example 1
+                'c2tnb191v1' => '1.2.840.10045.3.0.5', // J.4.3, example 1
+                'c2tnb191v2' => '1.2.840.10045.3.0.6', // J.4.3, example 2
+                'c2tnb191v3' => '1.2.840.10045.3.0.7', // J.4.3, example 3
+                'c2onb191v4' => '1.2.840.10045.3.0.8', // J.4.3, example 4
+                'c2onb191v5' => '1.2.840.10045.3.0.9', // J.4.3, example 5
+                'c2pnb208w1' => '1.2.840.10045.3.0.10', // J.4.4, example 1
+                'c2tnb239v1' => '1.2.840.10045.3.0.11', // J.4.5, example 1
+                'c2tnb239v2' => '1.2.840.10045.3.0.12', // J.4.5, example 2
+                'c2tnb239v3' => '1.2.840.10045.3.0.13', // J.4.5, example 3
+                'c2onb239v4' => '1.2.840.10045.3.0.14', // J.4.5, example 4
+                'c2onb239v5' => '1.2.840.10045.3.0.15', // J.4.5, example 5
+                'c2pnb272w1' => '1.2.840.10045.3.0.16', // J.4.6, example 1
+                'c2pnb304w1' => '1.2.840.10045.3.0.17', // J.4.7, example 1
+                'c2tnb359v1' => '1.2.840.10045.3.0.18', // J.4.8, example 1
+                'c2pnb368w1' => '1.2.840.10045.3.0.19', // J.4.9, example 1
+                'c2tnb431r1' => '1.2.840.10045.3.0.20', // J.4.10, example 1
+                */
+
+                // http://www.ecc-brainpool.org/download/Domain-parameters.pdf
+                // https://tools.ietf.org/html/rfc5639
+                'brainpoolP160r1' => '1.3.36.3.3.2.8.1.1.1',
+                'brainpoolP160t1' => '1.3.36.3.3.2.8.1.1.2',
+                'brainpoolP192r1' => '1.3.36.3.3.2.8.1.1.3',
+                'brainpoolP192t1' => '1.3.36.3.3.2.8.1.1.4',
+                'brainpoolP224r1' => '1.3.36.3.3.2.8.1.1.5',
+                'brainpoolP224t1' => '1.3.36.3.3.2.8.1.1.6',
+                'brainpoolP256r1' => '1.3.36.3.3.2.8.1.1.7',
+                'brainpoolP256t1' => '1.3.36.3.3.2.8.1.1.8',
+                'brainpoolP320r1' => '1.3.36.3.3.2.8.1.1.9',
+                'brainpoolP320t1' => '1.3.36.3.3.2.8.1.1.10',
+                'brainpoolP384r1' => '1.3.36.3.3.2.8.1.1.11',
+                'brainpoolP384t1' => '1.3.36.3.3.2.8.1.1.12',
+                'brainpoolP512r1' => '1.3.36.3.3.2.8.1.1.13',
+                'brainpoolP512t1' => '1.3.36.3.3.2.8.1.1.14'
+            ];
+            ASN1::loadOIDs([
+                'prime-field' => '1.2.840.10045.1.1',
+                'characteristic-two-field' => '1.2.840.10045.1.2',
+                'characteristic-two-basis' => '1.2.840.10045.1.2.3',
+                // per http://www.secg.org/SEC1-Ver-1.0.pdf#page=84, gnBasis "not used here"
+                'gnBasis' => '1.2.840.10045.1.2.3.1', // NULL
+                'tpBasis' => '1.2.840.10045.1.2.3.2', // Trinomial
+                'ppBasis' => '1.2.840.10045.1.2.3.3'  // Pentanomial
+            ] + self::$curveOIDs);
+        }
+    }
+
+    /**
+     * Explicitly set the curve
+     *
+     * If the key contains an implicit curve phpseclib needs the curve
+     * to be explicitly provided
+     *
+     * @param BaseCurve $curve
+     */
+    public static function setImplicitCurve(BaseCurve $curve)
+    {
+        self::$implicitCurve = $curve;
+    }
+
+    /**
+     * Returns an instance of \phpseclib3\Crypt\EC\BaseCurves\Base based
+     * on the curve parameters
+     *
+     * @param array $params
+     * @return BaseCurve|false
+     */
+    protected static function loadCurveByParam(array $params)
+    {
+        if (count($params) > 1) {
+            throw new \RuntimeException('No parameters are present');
+        }
+        if (isset($params['namedCurve'])) {
+            $curve = '\phpseclib3\Crypt\EC\Curves\\' . $params['namedCurve'];
+            if (!class_exists($curve)) {
+                throw new UnsupportedCurveException('Named Curve of ' . $params['namedCurve'] . ' is not supported');
+            }
+            return new $curve();
+        }
+        if (isset($params['implicitCurve'])) {
+            if (!isset(self::$implicitCurve)) {
+                throw new \RuntimeException('Implicit curves can be provided by calling setImplicitCurve');
+            }
+            return self::$implicitCurve;
+        }
+        if (isset($params['specifiedCurve'])) {
+            $data = $params['specifiedCurve'];
+            switch ($data['fieldID']['fieldType']) {
+                case 'prime-field':
+                    $curve = new PrimeCurve();
+                    $curve->setModulo($data['fieldID']['parameters']);
+                    $curve->setCoefficients(
+                        new BigInteger($data['curve']['a'], 256),
+                        new BigInteger($data['curve']['b'], 256)
+                    );
+                    $point = self::extractPoint("\0" . $data['base'], $curve);
+                    $curve->setBasePoint(...$point);
+                    $curve->setOrder($data['order']);
+                    return $curve;
+                case 'characteristic-two-field':
+                    $curve = new BinaryCurve();
+                    $params = ASN1::decodeBER($data['fieldID']['parameters']);
+                    $params = ASN1::asn1map($params[0], Maps\Characteristic_two::MAP);
+                    $modulo = [(int) $params['m']->toString()];
+                    switch ($params['basis']) {
+                        case 'tpBasis':
+                            $modulo[] = (int) $params['parameters']->toString();
+                            break;
+                        case 'ppBasis':
+                            $temp = ASN1::decodeBER($params['parameters']);
+                            $temp = ASN1::asn1map($temp[0], Maps\Pentanomial::MAP);
+                            $modulo[] = (int) $temp['k3']->toString();
+                            $modulo[] = (int) $temp['k2']->toString();
+                            $modulo[] = (int) $temp['k1']->toString();
+                    }
+                    $modulo[] = 0;
+                    $curve->setModulo(...$modulo);
+                    $len = ceil($modulo[0] / 8);
+                    $curve->setCoefficients(
+                        Strings::bin2hex($data['curve']['a']),
+                        Strings::bin2hex($data['curve']['b'])
+                    );
+                    $point = self::extractPoint("\0" . $data['base'], $curve);
+                    $curve->setBasePoint(...$point);
+                    $curve->setOrder($data['order']);
+                    return $curve;
+                default:
+                    throw new UnsupportedCurveException('Field Type of ' . $data['fieldID']['fieldType'] . ' is not supported');
+            }
+        }
+        throw new \RuntimeException('No valid parameters are present');
+    }
+
+    /**
+     * Extract points from a string
+     *
+     * Supports both compressed and uncompressed points
+     *
+     * @param string $str
+     * @param BaseCurve $curve
+     * @return object[]
+     */
+    public static function extractPoint($str, BaseCurve $curve)
+    {
+        if ($curve instanceof TwistedEdwardsCurve) {
+            // first step of point deciding as discussed at the following URL's:
+            // https://tools.ietf.org/html/rfc8032#section-5.1.3
+            // https://tools.ietf.org/html/rfc8032#section-5.2.3
+            $y = $str;
+            $y = strrev($y);
+            $sign = (bool) (ord($y[0]) & 0x80);
+            $y[0] = $y[0] & chr(0x7F);
+            $y = new BigInteger($y, 256);
+            if ($y->compare($curve->getModulo()) >= 0) {
+                throw new \RuntimeException('The Y coordinate should not be >= the modulo');
+            }
+            $point = $curve->recoverX($y, $sign);
+            if (!$curve->verifyPoint($point)) {
+                throw new \RuntimeException('Unable to verify that point exists on curve');
+            }
+            return $point;
+        }
+
+        // the first byte of a bit string represents the number of bits in the last byte that are to be ignored but,
+        // currently, bit strings wanting a non-zero amount of bits trimmed are not supported
+        if (($val = Strings::shift($str)) != "\0") {
+            throw new \UnexpectedValueException('extractPoint expects the first byte to be null - not ' . Strings::bin2hex($val));
+        }
+        if ($str == "\0") {
+            return [];
+        }
+
+        $keylen = strlen($str);
+        $order = $curve->getLengthInBytes();
+        // point compression is being used
+        if ($keylen == $order + 1) {
+            return $curve->derivePoint($str);
+        }
+
+        // point compression is not being used
+        if ($keylen == 2 * $order + 1) {
+            preg_match("#(.)(.{{$order}})(.{{$order}})#s", $str, $matches);
+            list(, $w, $x, $y) = $matches;
+            if ($w != "\4") {
+                throw new \UnexpectedValueException('The first byte of an uncompressed point should be 04 - not ' . Strings::bin2hex($val));
+            }
+            $point = [
+                $curve->convertInteger(new BigInteger($x, 256)),
+                $curve->convertInteger(new BigInteger($y, 256))
+            ];
+
+            if (!$curve->verifyPoint($point)) {
+                throw new \RuntimeException('Unable to verify that point exists on curve');
+            }
+
+            return $point;
+        }
+
+        throw new \UnexpectedValueException('The string representation of the points is not of an appropriate length');
+    }
+
+    /**
+     * Encode Parameters
+     *
+     * @todo Maybe at some point this could be moved to __toString() for each of the curves?
+     * @param BaseCurve $curve
+     * @param bool $returnArray optional
+     * @param array $options optional
+     * @return string|false
+     */
+    private static function encodeParameters(BaseCurve $curve, $returnArray = false, array $options = [])
+    {
+        $useNamedCurves = isset($options['namedCurve']) ? $options['namedCurve'] : self::$useNamedCurves;
+
+        $reflect = new \ReflectionClass($curve);
+        $name = $reflect->getShortName();
+        if ($useNamedCurves) {
+            if (isset(self::$curveOIDs[$name])) {
+                if ($reflect->isFinal()) {
+                    $reflect = $reflect->getParentClass();
+                    $name = $reflect->getShortName();
+                }
+                return $returnArray ?
+                    ['namedCurve' => $name] :
+                    ASN1::encodeDER(['namedCurve' => $name], Maps\ECParameters::MAP);
+            }
+            foreach (new \DirectoryIterator(__DIR__ . '/../../Curves/') as $file) {
+                if ($file->getExtension() != 'php') {
+                    continue;
+                }
+                $testName = $file->getBasename('.php');
+                $class = 'phpseclib3\Crypt\EC\Curves\\' . $testName;
+                $reflect = new \ReflectionClass($class);
+                if ($reflect->isFinal()) {
+                    continue;
+                }
+                $candidate = new $class();
+                switch ($name) {
+                    case 'Prime':
+                        if (!$candidate instanceof PrimeCurve) {
+                            break;
+                        }
+                        if (!$candidate->getModulo()->equals($curve->getModulo())) {
+                            break;
+                        }
+                        if ($candidate->getA()->toBytes() != $curve->getA()->toBytes()) {
+                            break;
+                        }
+                        if ($candidate->getB()->toBytes() != $curve->getB()->toBytes()) {
+                            break;
+                        }
+
+                        list($candidateX, $candidateY) = $candidate->getBasePoint();
+                        list($curveX, $curveY) = $curve->getBasePoint();
+                        if ($candidateX->toBytes() != $curveX->toBytes()) {
+                            break;
+                        }
+                        if ($candidateY->toBytes() != $curveY->toBytes()) {
+                            break;
+                        }
+
+                        return $returnArray ?
+                            ['namedCurve' => $testName] :
+                            ASN1::encodeDER(['namedCurve' => $testName], Maps\ECParameters::MAP);
+                    case 'Binary':
+                        if (!$candidate instanceof BinaryCurve) {
+                            break;
+                        }
+                        if ($candidate->getModulo() != $curve->getModulo()) {
+                            break;
+                        }
+                        if ($candidate->getA()->toBytes() != $curve->getA()->toBytes()) {
+                            break;
+                        }
+                        if ($candidate->getB()->toBytes() != $curve->getB()->toBytes()) {
+                            break;
+                        }
+
+                        list($candidateX, $candidateY) = $candidate->getBasePoint();
+                        list($curveX, $curveY) = $curve->getBasePoint();
+                        if ($candidateX->toBytes() != $curveX->toBytes()) {
+                            break;
+                        }
+                        if ($candidateY->toBytes() != $curveY->toBytes()) {
+                            break;
+                        }
+
+                        return $returnArray ?
+                            ['namedCurve' => $testName] :
+                            ASN1::encodeDER(['namedCurve' => $testName], Maps\ECParameters::MAP);
+                }
+            }
+        }
+
+        $order = $curve->getOrder();
+        // we could try to calculate the order thusly:
+        // https://crypto.stackexchange.com/a/27914/4520
+        // https://en.wikipedia.org/wiki/Schoof%E2%80%93Elkies%E2%80%93Atkin_algorithm
+        if (!$order) {
+            throw new \RuntimeException('Specified Curves need the order to be specified');
+        }
+        $point = $curve->getBasePoint();
+        $x = $point[0]->toBytes();
+        $y = $point[1]->toBytes();
+
+        if ($curve instanceof PrimeCurve) {
+            /*
+             * valid versions are:
+             *
+             * ecdpVer1:
+             *   - neither the curve or the base point are generated verifiably randomly.
+             * ecdpVer2:
+             *   - curve and base point are generated verifiably at random and curve.seed is present
+             * ecdpVer3:
+             *   - base point is generated verifiably at random but curve is not. curve.seed is present
+             */
+            // other (optional) parameters can be calculated using the methods discused at
+            // https://crypto.stackexchange.com/q/28947/4520
+            $data = [
+                'version' => 'ecdpVer1',
+                'fieldID' => [
+                    'fieldType' => 'prime-field',
+                    'parameters' => $curve->getModulo()
+                ],
+                'curve' => [
+                    'a' => $curve->getA()->toBytes(),
+                    'b' => $curve->getB()->toBytes()
+                ],
+                'base' => "\4" . $x . $y,
+                'order' => $order
+            ];
+
+            return $returnArray ?
+                ['specifiedCurve' => $data] :
+                ASN1::encodeDER(['specifiedCurve' => $data], Maps\ECParameters::MAP);
+        }
+        if ($curve instanceof BinaryCurve) {
+            $modulo = $curve->getModulo();
+            $basis = count($modulo);
+            $m = array_shift($modulo);
+            array_pop($modulo); // the last parameter should always be 0
+            //rsort($modulo);
+            switch ($basis) {
+                case 3:
+                    $basis = 'tpBasis';
+                    $modulo = new BigInteger($modulo[0]);
+                    break;
+                case 5:
+                    $basis = 'ppBasis';
+                    // these should be in strictly ascending order (hence the commented out rsort above)
+                    $modulo = [
+                        'k1' => new BigInteger($modulo[2]),
+                        'k2' => new BigInteger($modulo[1]),
+                        'k3' => new BigInteger($modulo[0])
+                    ];
+                    $modulo = ASN1::encodeDER($modulo, Maps\Pentanomial::MAP);
+                    $modulo = new ASN1\Element($modulo);
+            }
+            $params = ASN1::encodeDER([
+                'm' => new BigInteger($m),
+                'basis' => $basis,
+                'parameters' => $modulo
+            ], Maps\Characteristic_two::MAP);
+            $params = new ASN1\Element($params);
+            $a = ltrim($curve->getA()->toBytes(), "\0");
+            if (!strlen($a)) {
+                $a = "\0";
+            }
+            $b = ltrim($curve->getB()->toBytes(), "\0");
+            if (!strlen($b)) {
+                $b = "\0";
+            }
+            $data = [
+                'version' => 'ecdpVer1',
+                'fieldID' => [
+                    'fieldType' => 'characteristic-two-field',
+                    'parameters' => $params
+                ],
+                'curve' => [
+                    'a' => $a,
+                    'b' => $b
+                ],
+                'base' => "\4" . $x . $y,
+                'order' => $order
+            ];
+
+            return $returnArray ?
+                ['specifiedCurve' => $data] :
+                ASN1::encodeDER(['specifiedCurve' => $data], Maps\ECParameters::MAP);
+        }
+
+        throw new UnsupportedCurveException('Curve cannot be serialized');
+    }
+
+    /**
+     * Use Specified Curve
+     *
+     * A specified curve has all the coefficients, the base points, etc, explicitely included.
+     * A specified curve is a more verbose way of representing a curve
+     */
+    public static function useSpecifiedCurve()
+    {
+        self::$useNamedCurves = false;
+    }
+
+    /**
+     * Use Named Curve
+     *
+     * A named curve does not include any parameters. It is up to the EC parameters to
+     * know what the coefficients, the base points, etc, are from the name of the curve.
+     * A named curve is a more concise way of representing a curve
+     */
+    public static function useNamedCurve()
+    {
+        self::$useNamedCurves = true;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/JWK.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,189 @@
+<?php
+
+/**
+ * JSON Web Key (RFC7517 / RFC8037) Formatted EC Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\JWK as Progenitor;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Crypt\EC\Curves\secp256k1;
+use phpseclib3\Crypt\EC\Curves\secp256r1;
+use phpseclib3\Crypt\EC\Curves\secp384r1;
+use phpseclib3\Crypt\EC\Curves\secp521r1;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * JWK Formatted EC Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class JWK extends Progenitor
+{
+    use Common;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        switch ($key->kty) {
+            case 'EC':
+                switch ($key->crv) {
+                    case 'P-256':
+                    case 'P-384':
+                    case 'P-521':
+                    case 'secp256k1':
+                        break;
+                    default:
+                        throw new UnsupportedCurveException('Only P-256, P-384, P-521 and secp256k1 curves are accepted (' . $key->crv . ' provided)');
+                }
+                break;
+            case 'OKP':
+                switch ($key->crv) {
+                    case 'Ed25519':
+                    case 'Ed448':
+                        break;
+                    default:
+                        throw new UnsupportedCurveException('Only Ed25519 and Ed448 curves are accepted (' . $key->crv . ' provided)');
+                }
+                break;
+            default:
+                throw new \Exception('Only EC and OKP JWK keys are supported');
+        }
+
+        $curve = '\phpseclib3\Crypt\EC\Curves\\' . str_replace('P-', 'nistp', $key->crv);
+        $curve = new $curve();
+
+        if ($curve instanceof TwistedEdwardsCurve) {
+            $QA = self::extractPoint(Strings::base64url_decode($key->x), $curve);
+            if (!isset($key->d)) {
+                return compact('curve', 'QA');
+            }
+            $arr = $curve->extractSecret(Strings::base64url_decode($key->d));
+            return compact('curve', 'QA') + $arr;
+        }
+
+        $QA = [
+            $curve->convertInteger(new BigInteger(Strings::base64url_decode($key->x), 256)),
+            $curve->convertInteger(new BigInteger(Strings::base64url_decode($key->y), 256))
+        ];
+
+        if (!$curve->verifyPoint($QA)) {
+            throw new \RuntimeException('Unable to verify that point exists on curve');
+        }
+
+        if (!isset($key->d)) {
+            return compact('curve', 'QA');
+        }
+
+        $dA = new BigInteger(Strings::base64url_decode($key->d), 256);
+
+        $curve->rangeCheck($dA);
+
+        return compact('curve', 'dA', 'QA');
+    }
+
+    /**
+     * Returns the alias that corresponds to a curve
+     *
+     * @return string
+     */
+    private static function getAlias(BaseCurve $curve)
+    {
+        switch (true) {
+            case $curve instanceof secp256r1:
+                return 'P-256';
+            case $curve instanceof secp384r1:
+                return 'P-384';
+            case $curve instanceof secp521r1:
+                return 'P-521';
+            case $curve instanceof secp256k1:
+                return 'secp256k1';
+        }
+
+        $reflect = new \ReflectionClass($curve);
+        $curveName = $reflect->isFinal() ?
+            $reflect->getParentClass()->getShortName() :
+            $reflect->getShortName();
+        throw new UnsupportedCurveException("$curveName is not a supported curve");
+    }
+
+    /**
+     * Return the array superstructure for an EC public key
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @return array
+     */
+    private static function savePublicKeyHelper(BaseCurve $curve, array $publicKey)
+    {
+        if ($curve instanceof TwistedEdwardsCurve) {
+            return [
+                'kty' => 'OKP',
+                'crv' => $curve instanceof Ed25519 ? 'Ed25519' : 'Ed448',
+                'x' => Strings::base64url_encode($curve->encodePoint($publicKey))
+            ];
+        }
+
+        return [
+            'kty' => 'EC',
+            'crv' => self::getAlias($curve),
+            'x' => Strings::base64url_encode($publicKey[0]->toBytes()),
+            'y' => Strings::base64url_encode($publicKey[1]->toBytes())
+        ];
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BaseCurve $curve, array $publicKey, array $options = [])
+    {
+        $key = self::savePublicKeyHelper($curve, $publicKey);
+
+        return self::wrapKey($key, $options);
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param Ed25519 $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = '', array $options = [])
+    {
+        $key = self::savePublicKeyHelper($curve, $publicKey);
+        $key['d'] = $curve instanceof TwistedEdwardsCurve ? $secret : $privateKey->toBytes();
+        $key['d'] = Strings::base64url_encode($key['d']);
+
+        return self::wrapKey($key, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * Montgomery Private Key Handler
+ *
+ * "Naked" Curve25519 private keys can pretty much be any sequence of random 32x bytes so unless
+ * we have a "hidden" key handler pretty much every 32 byte string will be loaded as a curve25519
+ * private key even if it probably isn't one by PublicKeyLoader.
+ *
+ * "Naked" Curve25519 public keys also a string of 32 bytes so distinguishing between a "naked"
+ * curve25519 private key and a public key is nigh impossible, hence separate plugins for each
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\Curves\Curve25519;
+use phpseclib3\Crypt\EC\Curves\Curve448;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Montgomery Curve Private Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class MontgomeryPrivate
+{
+    /**
+     * Is invisible flag
+     *
+     */
+    const IS_INVISIBLE = true;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        switch (strlen($key)) {
+            case 32:
+                $curve = new Curve25519();
+                break;
+            case 56:
+                $curve = new Curve448();
+                break;
+            default:
+                throw new \LengthException('The only supported lengths are 32 and 56');
+        }
+
+        $components = ['curve' => $curve];
+        $components['dA'] = new BigInteger($key, 256);
+        $curve->rangeCheck($components['dA']);
+        // note that EC::getEncodedCoordinates does some additional "magic" (it does strrev on the result)
+        $components['QA'] = $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
+
+        return $components;
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param MontgomeryCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @return string
+     */
+    public static function savePublicKey(MontgomeryCurve $curve, array $publicKey)
+    {
+        return strrev($publicKey[0]->toBytes());
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param MontgomeryCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, MontgomeryCurve $curve, array $publicKey, $secret = null, $password = '')
+    {
+        if (!empty($password) && is_string($password)) {
+            throw new UnsupportedFormatException('MontgomeryPrivate private keys do not support encryption');
+        }
+
+        return $privateKey->toBytes();
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPublic.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPublic.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/MontgomeryPublic.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * Montgomery Public Key Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\Curves\Curve25519;
+use phpseclib3\Crypt\EC\Curves\Curve448;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Montgomery Public Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class MontgomeryPublic
+{
+    /**
+     * Is invisible flag
+     *
+     */
+    const IS_INVISIBLE = true;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        switch (strlen($key)) {
+            case 32:
+                $curve = new Curve25519();
+                break;
+            case 56:
+                $curve = new Curve448();
+                break;
+            default:
+                throw new \LengthException('The only supported lengths are 32 and 56');
+        }
+
+        $components = ['curve' => $curve];
+        $components['QA'] = [$components['curve']->convertInteger(new BigInteger(strrev($key), 256))];
+
+        return $components;
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param MontgomeryCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @return string
+     */
+    public static function savePublicKey(MontgomeryCurve $curve, array $publicKey)
+    {
+        return strrev($publicKey[0]->toBytes());
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,209 @@
+<?php
+
+/**
+ * OpenSSH Formatted EC Key Handler
+ *
+ * PHP version 5
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\OpenSSH as Progenitor;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * OpenSSH Formatted EC Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSH extends Progenitor
+{
+    use Common;
+
+    /**
+     * Supported Key Types
+     *
+     * @var array
+     */
+    protected static $types = [
+        'ecdsa-sha2-nistp256',
+        'ecdsa-sha2-nistp384',
+        'ecdsa-sha2-nistp521',
+        'ssh-ed25519'
+    ];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $parsed = parent::load($key, $password);
+
+        if (isset($parsed['paddedKey'])) {
+            $paddedKey = $parsed['paddedKey'];
+            list($type) = Strings::unpackSSH2('s', $paddedKey);
+            if ($type != $parsed['type']) {
+                throw new \RuntimeException("The public and private keys are not of the same type ($type vs $parsed[type])");
+            }
+            if ($type == 'ssh-ed25519') {
+                list(, $key, $comment) = Strings::unpackSSH2('sss', $paddedKey);
+                $key = libsodium::load($key);
+                $key['comment'] = $comment;
+                return $key;
+            }
+            list($curveName, $publicKey, $privateKey, $comment) = Strings::unpackSSH2('ssis', $paddedKey);
+            $curve = self::loadCurveByParam(['namedCurve' => $curveName]);
+            $curve->rangeCheck($privateKey);
+            return [
+                'curve' => $curve,
+                'dA' => $privateKey,
+                'QA' => self::extractPoint("\0$publicKey", $curve),
+                'comment' => $comment
+            ];
+        }
+
+        if ($parsed['type'] == 'ssh-ed25519') {
+            if (Strings::shift($parsed['publicKey'], 4) != "\0\0\0\x20") {
+                throw new \RuntimeException('Length of ssh-ed25519 key should be 32');
+            }
+
+            $curve = new Ed25519();
+            $qa = self::extractPoint($parsed['publicKey'], $curve);
+        } else {
+            list($curveName, $publicKey) = Strings::unpackSSH2('ss', $parsed['publicKey']);
+            $curveName = '\phpseclib3\Crypt\EC\Curves\\' . $curveName;
+            $curve = new $curveName();
+
+            $qa = self::extractPoint("\0" . $publicKey, $curve);
+        }
+
+        return [
+            'curve' => $curve,
+            'QA' => $qa,
+            'comment' => $parsed['comment']
+        ];
+    }
+
+    /**
+     * Returns the alias that corresponds to a curve
+     *
+     * @return string
+     */
+    private static function getAlias(BaseCurve $curve)
+    {
+        self::initialize_static_variables();
+
+        $reflect = new \ReflectionClass($curve);
+        $name = $reflect->getShortName();
+
+        $oid = self::$curveOIDs[$name];
+        $aliases = array_filter(self::$curveOIDs, function ($v) use ($oid) {
+            return $v == $oid;
+        });
+        $aliases = array_keys($aliases);
+
+        for ($i = 0; $i < count($aliases); $i++) {
+            if (in_array('ecdsa-sha2-' . $aliases[$i], self::$types)) {
+                $alias = $aliases[$i];
+                break;
+            }
+        }
+
+        if (!isset($alias)) {
+            throw new UnsupportedCurveException($name . ' is not a curve that the OpenSSH plugin supports');
+        }
+
+        return $alias;
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BaseCurve $curve, array $publicKey, array $options = [])
+    {
+        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;
+
+        if ($curve instanceof Ed25519) {
+            $key = Strings::packSSH2('ss', 'ssh-ed25519', $curve->encodePoint($publicKey));
+
+            if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+                return $key;
+            }
+
+            $key = 'ssh-ed25519 ' . base64_encode($key) . ' ' . $comment;
+            return $key;
+        }
+
+        $alias = self::getAlias($curve);
+
+        $points = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+        $key = Strings::packSSH2('sss', 'ecdsa-sha2-' . $alias, $alias, $points);
+
+        if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+            return $key;
+        }
+
+        $key = 'ecdsa-sha2-' . $alias . ' ' . base64_encode($key) . ' ' . $comment;
+
+        return $key;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param Ed25519 $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = '', array $options = [])
+    {
+        if ($curve instanceof Ed25519) {
+            if (!isset($secret)) {
+                throw new \RuntimeException('Private Key does not have a secret set');
+            }
+            if (strlen($secret) != 32) {
+                throw new \RuntimeException('Private Key secret is not of the correct length');
+            }
+
+            $pubKey = $curve->encodePoint($publicKey);
+
+            $publicKey = Strings::packSSH2('ss', 'ssh-ed25519', $pubKey);
+            $privateKey = Strings::packSSH2('sss', 'ssh-ed25519', $pubKey, $secret . $pubKey);
+
+            return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);
+        }
+
+        $alias = self::getAlias($curve);
+
+        $points = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+        $publicKey = self::savePublicKey($curve, $publicKey, ['binary' => true]);
+
+        $privateKey = Strings::packSSH2('sssi', 'ecdsa-sha2-' . $alias, $alias, $points, $privateKey);
+
+        return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,194 @@
+<?php
+
+/**
+ * "PKCS1" (RFC5915) Formatted EC Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by File/X509.php
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN EC PRIVATE KEY-----
+ * -----BEGIN EC PARAMETERS-----
+ *
+ * Technically, PKCS1 is for RSA keys, only, but we're using PKCS1 to describe
+ * DSA, whose format isn't really formally described anywhere, so might as well
+ * use it to describe this, too. PKCS1 is easier to remember than RFC5915, after
+ * all. I suppose this could also be named IETF but idk
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS1 as Progenitor;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * "PKCS1" (RFC5915) Formatted EC Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS1 extends Progenitor
+{
+    use Common;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        self::initialize_static_variables();
+
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (strpos($key, 'BEGIN EC PARAMETERS') && strpos($key, 'BEGIN EC PRIVATE KEY')) {
+            $components = [];
+
+            preg_match('#-*BEGIN EC PRIVATE KEY-*[^-]*-*END EC PRIVATE KEY-*#s', $key, $matches);
+            $decoded = parent::load($matches[0], $password);
+            $decoded = ASN1::decodeBER($decoded);
+            if (!$decoded) {
+                throw new \RuntimeException('Unable to decode BER');
+            }
+
+            $ecPrivate = ASN1::asn1map($decoded[0], Maps\ECPrivateKey::MAP);
+            if (!is_array($ecPrivate)) {
+                throw new \RuntimeException('Unable to perform ASN1 mapping');
+            }
+
+            if (isset($ecPrivate['parameters'])) {
+                $components['curve'] = self::loadCurveByParam($ecPrivate['parameters']);
+            }
+
+            preg_match('#-*BEGIN EC PARAMETERS-*[^-]*-*END EC PARAMETERS-*#s', $key, $matches);
+            $decoded = parent::load($matches[0], '');
+            $decoded = ASN1::decodeBER($decoded);
+            if (!$decoded) {
+                throw new \RuntimeException('Unable to decode BER');
+            }
+            $ecParams = ASN1::asn1map($decoded[0], Maps\ECParameters::MAP);
+            if (!is_array($ecParams)) {
+                throw new \RuntimeException('Unable to perform ASN1 mapping');
+            }
+            $ecParams = self::loadCurveByParam($ecParams);
+
+            // comparing $ecParams and $components['curve'] directly won't work because they'll have different Math\Common\FiniteField classes
+            // even if the modulo is the same
+            if (isset($components['curve']) && self::encodeParameters($ecParams, false, []) != self::encodeParameters($components['curve'], false, [])) {
+                throw new \RuntimeException('EC PARAMETERS does not correspond to EC PRIVATE KEY');
+            }
+
+            if (!isset($components['curve'])) {
+                $components['curve'] = $ecParams;
+            }
+
+            $components['dA'] = new BigInteger($ecPrivate['privateKey'], 256);
+            $components['curve']->rangeCheck($components['dA']);
+            $components['QA'] = isset($ecPrivate['publicKey']) ?
+                self::extractPoint($ecPrivate['publicKey'], $components['curve']) :
+                $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
+
+            return $components;
+        }
+
+        $key = parent::load($key, $password);
+
+        $decoded = ASN1::decodeBER($key);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\ECParameters::MAP);
+        if (is_array($key)) {
+            return ['curve' => self::loadCurveByParam($key)];
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\ECPrivateKey::MAP);
+        if (!is_array($key)) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping');
+        }
+        if (!isset($key['parameters'])) {
+            throw new \RuntimeException('Key cannot be loaded without parameters');
+        }
+
+        $components = [];
+        $components['curve'] = self::loadCurveByParam($key['parameters']);
+        $components['dA'] = new BigInteger($key['privateKey'], 256);
+        $components['QA'] = isset($ecPrivate['publicKey']) ?
+            self::extractPoint($ecPrivate['publicKey'], $components['curve']) :
+            $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
+
+        return $components;
+    }
+
+    /**
+     * Convert EC parameters to the appropriate format
+     *
+     * @return string
+     */
+    public static function saveParameters(BaseCurve $curve, array $options = [])
+    {
+        self::initialize_static_variables();
+
+        if ($curve instanceof TwistedEdwardsCurve || $curve instanceof MontgomeryCurve) {
+            throw new UnsupportedCurveException('TwistedEdwards and Montgomery Curves are not supported');
+        }
+
+        $key = self::encodeParameters($curve, false, $options);
+
+        return "-----BEGIN EC PARAMETERS-----\r\n" .
+               chunk_split(Strings::base64_encode($key), 64) .
+               "-----END EC PARAMETERS-----\r\n";
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = '', array $options = [])
+    {
+        self::initialize_static_variables();
+
+        if ($curve instanceof TwistedEdwardsCurve  || $curve instanceof MontgomeryCurve) {
+            throw new UnsupportedCurveException('TwistedEdwards Curves are not supported');
+        }
+
+        $publicKey = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+
+        $key = [
+            'version' => 'ecPrivkeyVer1',
+            'privateKey' => $privateKey->toBytes(),
+            'parameters' => new ASN1\Element(self::encodeParameters($curve)),
+            'publicKey' => "\0" . $publicKey
+        ];
+
+        $key = ASN1::encodeDER($key, Maps\ECPrivateKey::MAP);
+
+        return self::wrapPrivateKey($key, 'EC', $password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,236 @@
+<?php
+
+/**
+ * PKCS#8 Formatted EC Key Handler
+ *
+ * PHP version 5
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
+ * is specific to private keys it's basically creating a DER-encoded wrapper
+ * for keys. This just extends that same concept to public keys (much like ssh-keygen)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Crypt\EC\Curves\Ed448;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#8 Formatted EC Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS8 extends Progenitor
+{
+    use Common;
+
+    /**
+     * OID Name
+     *
+     * @var array
+     */
+    const OID_NAME = ['id-ecPublicKey', 'id-Ed25519', 'id-Ed448'];
+
+    /**
+     * OID Value
+     *
+     * @var string
+     */
+    const OID_VALUE = ['1.2.840.10045.2.1', '1.3.101.112', '1.3.101.113'];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        // initialize_static_variables() is defined in both the trait and the parent class
+        // when it's defined in two places it's the traits one that's called
+        // the parent one is needed, as well, but the parent one is called by other methods
+        // in the parent class as needed and in the context of the parent it's the parent
+        // one that's called
+        self::initialize_static_variables();
+
+        $key = parent::load($key, $password);
+
+        $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
+
+        switch ($key[$type . 'Algorithm']['algorithm']) {
+            case 'id-Ed25519':
+            case 'id-Ed448':
+                return self::loadEdDSA($key);
+        }
+
+        $decoded = ASN1::decodeBER($key[$type . 'Algorithm']['parameters']->element);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+        $params = ASN1::asn1map($decoded[0], Maps\ECParameters::MAP);
+        if (!$params) {
+            throw new \RuntimeException('Unable to decode the parameters using Maps\ECParameters');
+        }
+
+        $components = [];
+        $components['curve'] = self::loadCurveByParam($params);
+
+        if ($type == 'publicKey') {
+            $components['QA'] = self::extractPoint("\0" . $key['publicKey'], $components['curve']);
+
+            return $components;
+        }
+
+        $decoded = ASN1::decodeBER($key['privateKey']);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+        $key = ASN1::asn1map($decoded[0], Maps\ECPrivateKey::MAP);
+        if (isset($key['parameters']) && $params != $key['parameters']) {
+            throw new \RuntimeException('The PKCS8 parameter field does not match the private key parameter field');
+        }
+
+        $components['dA'] = new BigInteger($key['privateKey'], 256);
+        $components['curve']->rangeCheck($components['dA']);
+        $components['QA'] = isset($key['publicKey']) ?
+            self::extractPoint($key['publicKey'], $components['curve']) :
+            $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
+
+        return $components;
+    }
+
+    /**
+     * Break a public or private EdDSA key down into its constituent components
+     *
+     * @return array
+     */
+    private static function loadEdDSA(array $key)
+    {
+        $components = [];
+
+        if (isset($key['privateKey'])) {
+            $components['curve'] = $key['privateKeyAlgorithm']['algorithm'] == 'id-Ed25519' ? new Ed25519() : new Ed448();
+            $expected = chr(ASN1::TYPE_OCTET_STRING) . ASN1::encodeLength($components['curve']::SIZE);
+            if (substr($key['privateKey'], 0, 2) != $expected) {
+                throw new \RuntimeException(
+                    'The first two bytes of the ' .
+                    $key['privateKeyAlgorithm']['algorithm'] .
+                    ' private key field should be 0x' . bin2hex($expected)
+                );
+            }
+            $arr = $components['curve']->extractSecret(substr($key['privateKey'], 2));
+            $components['dA'] = $arr['dA'];
+            $components['secret'] = $arr['secret'];
+        }
+
+        if (isset($key['publicKey'])) {
+            if (!isset($components['curve'])) {
+                $components['curve'] = $key['publicKeyAlgorithm']['algorithm'] == 'id-Ed25519' ? new Ed25519() : new Ed448();
+            }
+
+            $components['QA'] = self::extractPoint($key['publicKey'], $components['curve']);
+        }
+
+        if (isset($key['privateKey']) && !isset($components['QA'])) {
+            $components['QA'] = $components['curve']->multiplyPoint($components['curve']->getBasePoint(), $components['dA']);
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BaseCurve $curve, array $publicKey, array $options = [])
+    {
+        self::initialize_static_variables();
+
+        if ($curve instanceof MontgomeryCurve) {
+            throw new UnsupportedCurveException('Montgomery Curves are not supported');
+        }
+
+        if ($curve instanceof TwistedEdwardsCurve) {
+            return self::wrapPublicKey(
+                $curve->encodePoint($publicKey),
+                null,
+                $curve instanceof Ed25519 ? 'id-Ed25519' : 'id-Ed448'
+            );
+        }
+
+        $params = new ASN1\Element(self::encodeParameters($curve, false, $options));
+
+        $key = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+
+        return self::wrapPublicKey($key, $params, 'id-ecPublicKey');
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = '', array $options = [])
+    {
+        self::initialize_static_variables();
+
+        if ($curve instanceof MontgomeryCurve) {
+            throw new UnsupportedCurveException('Montgomery Curves are not supported');
+        }
+
+        if ($curve instanceof TwistedEdwardsCurve) {
+            return self::wrapPrivateKey(
+                chr(ASN1::TYPE_OCTET_STRING) . ASN1::encodeLength($curve::SIZE) . $secret,
+                [],
+                null,
+                $password,
+                $curve instanceof Ed25519 ? 'id-Ed25519' : 'id-Ed448'
+            );
+        }
+
+        $publicKey = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+
+        $params = new ASN1\Element(self::encodeParameters($curve, false, $options));
+
+        $key = [
+            'version' => 'ecPrivkeyVer1',
+            'privateKey' => $privateKey->toBytes(),
+            //'parameters' => $params,
+            'publicKey' => "\0" . $publicKey
+        ];
+
+        $key = ASN1::encodeDER($key, Maps\ECPrivateKey::MAP);
+
+        return self::wrapPrivateKey($key, [], $params, $password, 'id-ecPublicKey', '', $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PuTTY.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,138 @@
+<?php
+
+/**
+ * PuTTY Formatted EC Key Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PuTTY Formatted EC Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PuTTY extends Progenitor
+{
+    use Common;
+
+    /**
+     * Public Handler
+     *
+     * @var string
+     */
+    const PUBLIC_HANDLER = 'phpseclib3\Crypt\EC\Formats\Keys\OpenSSH';
+
+    /**
+     * Supported Key Types
+     *
+     * @var array
+     */
+    protected static $types = [
+        'ecdsa-sha2-nistp256',
+        'ecdsa-sha2-nistp384',
+        'ecdsa-sha2-nistp521',
+        'ssh-ed25519'
+    ];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $components = parent::load($key, $password);
+        if (!isset($components['private'])) {
+            return $components;
+        }
+
+        $private = $components['private'];
+
+        $temp = Strings::base64_encode(Strings::packSSH2('s', $components['type']) . $components['public']);
+        $components = OpenSSH::load($components['type'] . ' ' . $temp . ' ' . $components['comment']);
+
+        if ($components['curve'] instanceof TwistedEdwardsCurve) {
+            if (Strings::shift($private, 4) != "\0\0\0\x20") {
+                throw new \RuntimeException('Length of ssh-ed25519 key should be 32');
+            }
+            $arr = $components['curve']->extractSecret($private);
+            $components['dA'] = $arr['dA'];
+            $components['secret'] = $arr['secret'];
+        } else {
+            list($components['dA']) = Strings::unpackSSH2('i', $private);
+            $components['curve']->rangeCheck($components['dA']);
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, BaseCurve $curve, array $publicKey, $secret = null, $password = false, array $options = [])
+    {
+        self::initialize_static_variables();
+
+        $public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
+        $name = $public[0];
+        $public = Strings::base64_decode($public[1]);
+        list(, $length) = unpack('N', Strings::shift($public, 4));
+        Strings::shift($public, $length);
+
+        // PuTTY pads private keys with a null byte per the following:
+        // https://github.com/github/putty/blob/a3d14d77f566a41fc61dfdc5c2e0e384c9e6ae8b/sshecc.c#L1926
+        if (!$curve instanceof TwistedEdwardsCurve) {
+            $private = $privateKey->toBytes();
+            if (!(strlen($privateKey->toBits()) & 7)) {
+                $private = "\0$private";
+            }
+        }
+
+        $private = $curve instanceof TwistedEdwardsCurve ?
+            Strings::packSSH2('s', $secret) :
+            Strings::packSSH2('s', $private);
+
+        return self::wrapPrivateKey($public, $private, $name, $password, $options);
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField[] $publicKey
+     * @return string
+     */
+    public static function savePublicKey(BaseCurve $curve, array $publicKey)
+    {
+        $public = explode(' ', OpenSSH::savePublicKey($curve, $publicKey));
+        $type = $public[0];
+        $public = Strings::base64_decode($public[1]);
+        list(, $length) = unpack('N', Strings::shift($public, 4));
+        Strings::shift($public, $length);
+
+        return self::wrapPublicKey($public, $type);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/XML.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,485 @@
+<?php
+
+/**
+ * XML Formatted EC Key Handler
+ *
+ * More info:
+ *
+ * https://www.w3.org/TR/xmldsig-core/#sec-ECKeyValue
+ * http://en.wikipedia.org/wiki/XML_Signature
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\Prime as PrimeCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * XML Formatted EC Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class XML
+{
+    use Common;
+
+    /**
+     * Default namespace
+     *
+     * @var string
+     */
+    private static $namespace;
+
+    /**
+     * Flag for using RFC4050 syntax
+     *
+     * @var bool
+     */
+    private static $rfc4050 = false;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        self::initialize_static_variables();
+
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (!class_exists('DOMDocument')) {
+            throw new BadConfigurationException('The dom extension is not setup correctly on this system');
+        }
+
+        $use_errors = libxml_use_internal_errors(true);
+
+        $temp = self::isolateNamespace($key, 'http://www.w3.org/2009/xmldsig11#');
+        if ($temp) {
+            $key = $temp;
+        }
+
+        $temp = self::isolateNamespace($key, 'http://www.w3.org/2001/04/xmldsig-more#');
+        if ($temp) {
+            $key = $temp;
+        }
+
+        $dom = new \DOMDocument();
+        if (substr($key, 0, 5) != '<?xml') {
+            $key = '<xml>' . $key . '</xml>';
+        }
+
+        if (!$dom->loadXML($key)) {
+            libxml_use_internal_errors($use_errors);
+            throw new \UnexpectedValueException('Key does not appear to contain XML');
+        }
+        $xpath = new \DOMXPath($dom);
+        libxml_use_internal_errors($use_errors);
+        $curve = self::loadCurveByParam($xpath);
+
+        $pubkey = self::query($xpath, 'publickey', 'Public Key is not present');
+
+        $QA = self::query($xpath, 'ecdsakeyvalue')->length ?
+            self::extractPointRFC4050($xpath, $curve) :
+            self::extractPoint("\0" . $pubkey, $curve);
+
+        libxml_use_internal_errors($use_errors);
+
+        return compact('curve', 'QA');
+    }
+
+    /**
+     * Case-insensitive xpath query
+     *
+     * @param \DOMXPath $xpath
+     * @param string $name
+     * @param string $error optional
+     * @param bool $decode optional
+     * @return \DOMNodeList
+     */
+    private static function query(\DOMXPath $xpath, $name, $error = null, $decode = true)
+    {
+        $query = '/';
+        $names = explode('/', $name);
+        foreach ($names as $name) {
+            $query .= "/*[translate(local-name(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz')='$name']";
+        }
+        $result = $xpath->query($query);
+        if (!isset($error)) {
+            return $result;
+        }
+
+        if (!$result->length) {
+            throw new \RuntimeException($error);
+        }
+        return $decode ? self::decodeValue($result->item(0)->textContent) : $result->item(0)->textContent;
+    }
+
+    /**
+     * Finds the first element in the relevant namespace, strips the namespacing and returns the XML for that element.
+     *
+     * @param string $xml
+     * @param string $ns
+     */
+    private static function isolateNamespace($xml, $ns)
+    {
+        $dom = new \DOMDocument();
+        if (!$dom->loadXML($xml)) {
+            return false;
+        }
+        $xpath = new \DOMXPath($dom);
+        $nodes = $xpath->query("//*[namespace::*[.='$ns'] and not(../namespace::*[.='$ns'])]");
+        if (!$nodes->length) {
+            return false;
+        }
+        $node = $nodes->item(0);
+        $ns_name = $node->lookupPrefix($ns);
+        if ($ns_name) {
+            $node->removeAttributeNS($ns, $ns_name);
+        }
+        return $dom->saveXML($node);
+    }
+
+    /**
+     * Decodes the value
+     *
+     * @param string $value
+     */
+    private static function decodeValue($value)
+    {
+        return Strings::base64_decode(str_replace(["\r", "\n", ' ', "\t"], '', $value));
+    }
+
+    /**
+     * Extract points from an XML document
+     *
+     * @param \DOMXPath $xpath
+     * @param BaseCurve $curve
+     * @return object[]
+     */
+    private static function extractPointRFC4050(\DOMXPath $xpath, BaseCurve $curve)
+    {
+        $x = self::query($xpath, 'publickey/x');
+        $y = self::query($xpath, 'publickey/y');
+        if (!$x->length || !$x->item(0)->hasAttribute('Value')) {
+            throw new \RuntimeException('Public Key / X coordinate not found');
+        }
+        if (!$y->length || !$y->item(0)->hasAttribute('Value')) {
+            throw new \RuntimeException('Public Key / Y coordinate not found');
+        }
+        $point = [
+            $curve->convertInteger(new BigInteger($x->item(0)->getAttribute('Value'))),
+            $curve->convertInteger(new BigInteger($y->item(0)->getAttribute('Value')))
+        ];
+        if (!$curve->verifyPoint($point)) {
+            throw new \RuntimeException('Unable to verify that point exists on curve');
+        }
+        return $point;
+    }
+
+    /**
+     * Returns an instance of \phpseclib3\Crypt\EC\BaseCurves\Base based
+     * on the curve parameters
+     *
+     * @param \DomXPath $xpath
+     * @return BaseCurve|false
+     */
+    private static function loadCurveByParam(\DOMXPath $xpath)
+    {
+        $namedCurve = self::query($xpath, 'namedcurve');
+        if ($namedCurve->length == 1) {
+            $oid = $namedCurve->item(0)->getAttribute('URN');
+            $oid = preg_replace('#[^\d.]#', '', $oid);
+            $name = array_search($oid, self::$curveOIDs);
+            if ($name === false) {
+                throw new UnsupportedCurveException('Curve with OID of ' . $oid . ' is not supported');
+            }
+
+            $curve = '\phpseclib3\Crypt\EC\Curves\\' . $name;
+            if (!class_exists($curve)) {
+                throw new UnsupportedCurveException('Named Curve of ' . $name . ' is not supported');
+            }
+            return new $curve();
+        }
+
+        $params = self::query($xpath, 'explicitparams');
+        if ($params->length) {
+            return self::loadCurveByParamRFC4050($xpath);
+        }
+
+        $params = self::query($xpath, 'ecparameters');
+        if (!$params->length) {
+            throw new \RuntimeException('No parameters are present');
+        }
+
+        $fieldTypes = [
+            'prime-field' => ['fieldid/prime/p'],
+            'gnb' => ['fieldid/gnb/m'],
+            'tnb' => ['fieldid/tnb/k'],
+            'pnb' => ['fieldid/pnb/k1', 'fieldid/pnb/k2', 'fieldid/pnb/k3'],
+            'unknown' => []
+        ];
+
+        foreach ($fieldTypes as $type => $queries) {
+            foreach ($queries as $query) {
+                $result = self::query($xpath, $query);
+                if (!$result->length) {
+                    continue 2;
+                }
+                $param = preg_replace('#.*/#', '', $query);
+                $$param = self::decodeValue($result->item(0)->textContent);
+            }
+            break;
+        }
+
+        $a = self::query($xpath, 'curve/a', 'A coefficient is not present');
+        $b = self::query($xpath, 'curve/b', 'B coefficient is not present');
+        $base = self::query($xpath, 'base', 'Base point is not present');
+        $order = self::query($xpath, 'order', 'Order is not present');
+
+        switch ($type) {
+            case 'prime-field':
+                $curve = new PrimeCurve();
+                $curve->setModulo(new BigInteger($p, 256));
+                $curve->setCoefficients(
+                    new BigInteger($a, 256),
+                    new BigInteger($b, 256)
+                );
+                $point = self::extractPoint("\0" . $base, $curve);
+                $curve->setBasePoint(...$point);
+                $curve->setOrder(new BigInteger($order, 256));
+                return $curve;
+            case 'gnb':
+            case 'tnb':
+            case 'pnb':
+            default:
+                throw new UnsupportedCurveException('Field Type of ' . $type . ' is not supported');
+        }
+    }
+
+    /**
+     * Returns an instance of \phpseclib3\Crypt\EC\BaseCurves\Base based
+     * on the curve parameters
+     *
+     * @param \DomXPath $xpath
+     * @return BaseCurve|false
+     */
+    private static function loadCurveByParamRFC4050(\DOMXPath $xpath)
+    {
+        $fieldTypes = [
+            'prime-field' => ['primefieldparamstype/p'],
+            'unknown' => []
+        ];
+
+        foreach ($fieldTypes as $type => $queries) {
+            foreach ($queries as $query) {
+                $result = self::query($xpath, $query);
+                if (!$result->length) {
+                    continue 2;
+                }
+                $param = preg_replace('#.*/#', '', $query);
+                $$param = $result->item(0)->textContent;
+            }
+            break;
+        }
+
+        $a = self::query($xpath, 'curveparamstype/a', 'A coefficient is not present', false);
+        $b = self::query($xpath, 'curveparamstype/b', 'B coefficient is not present', false);
+        $x = self::query($xpath, 'basepointparams/basepoint/ecpointtype/x', 'Base Point X is not present', false);
+        $y = self::query($xpath, 'basepointparams/basepoint/ecpointtype/y', 'Base Point Y is not present', false);
+        $order = self::query($xpath, 'order', 'Order is not present', false);
+
+        switch ($type) {
+            case 'prime-field':
+                $curve = new PrimeCurve();
+
+                $p = str_replace(["\r", "\n", ' ', "\t"], '', $p);
+                $curve->setModulo(new BigInteger($p));
+
+                $a = str_replace(["\r", "\n", ' ', "\t"], '', $a);
+                $b = str_replace(["\r", "\n", ' ', "\t"], '', $b);
+                $curve->setCoefficients(
+                    new BigInteger($a),
+                    new BigInteger($b)
+                );
+
+                $x = str_replace(["\r", "\n", ' ', "\t"], '', $x);
+                $y = str_replace(["\r", "\n", ' ', "\t"], '', $y);
+                $curve->setBasePoint(
+                    new BigInteger($x),
+                    new BigInteger($y)
+                );
+
+                $order = str_replace(["\r", "\n", ' ', "\t"], '', $order);
+                $curve->setOrder(new BigInteger($order));
+                return $curve;
+            default:
+                throw new UnsupportedCurveException('Field Type of ' . $type . ' is not supported');
+        }
+    }
+
+    /**
+     * Sets the namespace. dsig11 is the most common one.
+     *
+     * Set to null to unset. Used only for creating public keys.
+     *
+     * @param string $namespace
+     */
+    public static function setNamespace($namespace)
+    {
+        self::$namespace = $namespace;
+    }
+
+    /**
+     * Uses the XML syntax specified in https://tools.ietf.org/html/rfc4050
+     */
+    public static function enableRFC4050Syntax()
+    {
+        self::$rfc4050 = true;
+    }
+
+    /**
+     * Uses the XML syntax specified in https://www.w3.org/TR/xmldsig-core/#sec-ECParameters
+     */
+    public static function disableRFC4050Syntax()
+    {
+        self::$rfc4050 = false;
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BaseCurve $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BaseCurve $curve, array $publicKey, array $options = [])
+    {
+        self::initialize_static_variables();
+
+        if ($curve instanceof TwistedEdwardsCurve || $curve instanceof MontgomeryCurve) {
+            throw new UnsupportedCurveException('TwistedEdwards and Montgomery Curves are not supported');
+        }
+
+        if (empty(static::$namespace)) {
+            $pre = $post = '';
+        } else {
+            $pre = static::$namespace . ':';
+            $post = ':' . static::$namespace;
+        }
+
+        if (self::$rfc4050) {
+            return '<' . $pre . 'ECDSAKeyValue xmlns' . $post . '="http://www.w3.org/2001/04/xmldsig-more#">' . "\r\n" .
+                   self::encodeXMLParameters($curve, $pre, $options) . "\r\n" .
+                   '<' . $pre . 'PublicKey>' . "\r\n" .
+                   '<' . $pre . 'X Value="' . $publicKey[0] . '" />' . "\r\n" .
+                   '<' . $pre . 'Y Value="' . $publicKey[1] . '" />' . "\r\n" .
+                   '</' . $pre . 'PublicKey>' . "\r\n" .
+                   '</' . $pre . 'ECDSAKeyValue>';
+        }
+
+        $publicKey = "\4" . $publicKey[0]->toBytes() . $publicKey[1]->toBytes();
+
+        return '<' . $pre . 'ECDSAKeyValue xmlns' . $post . '="http://www.w3.org/2009/xmldsig11#">' . "\r\n" .
+               self::encodeXMLParameters($curve, $pre, $options) . "\r\n" .
+               '<' . $pre . 'PublicKey>' . Strings::base64_encode($publicKey) . '</' . $pre . 'PublicKey>' . "\r\n" .
+               '</' . $pre . 'ECDSAKeyValue>';
+    }
+
+    /**
+     * Encode Parameters
+     *
+     * @param BaseCurve $curve
+     * @param string $pre
+     * @param array $options optional
+     * @return string|false
+     */
+    private static function encodeXMLParameters(BaseCurve $curve, $pre, array $options = [])
+    {
+        $result = self::encodeParameters($curve, true, $options);
+
+        if (isset($result['namedCurve'])) {
+            $namedCurve = '<' . $pre . 'NamedCurve URI="urn:oid:' . self::$curveOIDs[$result['namedCurve']] . '" />';
+            return self::$rfc4050 ?
+                '<DomainParameters>' . str_replace('URI', 'URN', $namedCurve) . '</DomainParameters>' :
+                $namedCurve;
+        }
+
+        if (self::$rfc4050) {
+            $xml = '<' . $pre . 'ExplicitParams>' . "\r\n" .
+                  '<' . $pre . 'FieldParams>' . "\r\n";
+            $temp = $result['specifiedCurve'];
+            switch ($temp['fieldID']['fieldType']) {
+                case 'prime-field':
+                    $xml .= '<' . $pre . 'PrimeFieldParamsType>' . "\r\n" .
+                           '<' . $pre . 'P>' . $temp['fieldID']['parameters'] . '</' . $pre . 'P>' . "\r\n" .
+                           '</' . $pre . 'PrimeFieldParamsType>' . "\r\n";
+                    $a = $curve->getA();
+                    $b = $curve->getB();
+                    list($x, $y) = $curve->getBasePoint();
+                    break;
+                default:
+                    throw new UnsupportedCurveException('Field Type of ' . $temp['fieldID']['fieldType'] . ' is not supported');
+            }
+            $xml .= '</' . $pre . 'FieldParams>' . "\r\n" .
+                   '<' . $pre . 'CurveParamsType>' . "\r\n" .
+                   '<' . $pre . 'A>' . $a . '</' . $pre . 'A>' . "\r\n" .
+                   '<' . $pre . 'B>' . $b . '</' . $pre . 'B>' . "\r\n" .
+                   '</' . $pre . 'CurveParamsType>' . "\r\n" .
+                   '<' . $pre . 'BasePointParams>' . "\r\n" .
+                   '<' . $pre . 'BasePoint>' . "\r\n" .
+                   '<' . $pre . 'ECPointType>' . "\r\n" .
+                   '<' . $pre . 'X>' . $x . '</' . $pre . 'X>' . "\r\n" .
+                   '<' . $pre . 'Y>' . $y . '</' . $pre . 'Y>' . "\r\n" .
+                   '</' . $pre . 'ECPointType>' . "\r\n" .
+                   '</' . $pre . 'BasePoint>' . "\r\n" .
+                   '<' . $pre . 'Order>' . $curve->getOrder() . '</' . $pre . 'Order>' . "\r\n" .
+                   '</' . $pre . 'BasePointParams>' . "\r\n" .
+                   '</' . $pre . 'ExplicitParams>' . "\r\n";
+
+            return $xml;
+        }
+
+        if (isset($result['specifiedCurve'])) {
+            $xml = '<' . $pre . 'ECParameters>' . "\r\n" .
+                   '<' . $pre . 'FieldID>' . "\r\n";
+            $temp = $result['specifiedCurve'];
+            switch ($temp['fieldID']['fieldType']) {
+                case 'prime-field':
+                    $xml .= '<' . $pre . 'Prime>' . "\r\n" .
+                           '<' . $pre . 'P>' . Strings::base64_encode($temp['fieldID']['parameters']->toBytes()) . '</' . $pre . 'P>' . "\r\n" .
+                           '</' . $pre . 'Prime>' . "\r\n" ;
+                    break;
+                default:
+                    throw new UnsupportedCurveException('Field Type of ' . $temp['fieldID']['fieldType'] . ' is not supported');
+            }
+            $xml .= '</' . $pre . 'FieldID>' . "\r\n" .
+                   '<' . $pre . 'Curve>' . "\r\n" .
+                   '<' . $pre . 'A>' . Strings::base64_encode($temp['curve']['a']) . '</' . $pre . 'A>' . "\r\n" .
+                   '<' . $pre . 'B>' . Strings::base64_encode($temp['curve']['b']) . '</' . $pre . 'B>' . "\r\n" .
+                   '</' . $pre . 'Curve>' . "\r\n" .
+                   '<' . $pre . 'Base>' . Strings::base64_encode($temp['base']) . '</' . $pre . 'Base>' . "\r\n" .
+                   '<' . $pre . 'Order>' . Strings::base64_encode($temp['order']) . '</' . $pre . 'Order>' . "\r\n" .
+                   '</' . $pre . 'ECParameters>';
+            return $xml;
+        }
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/libsodium.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/libsodium.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Keys/libsodium.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,116 @@
+<?php
+
+/**
+ * libsodium Key Handler
+ *
+ * Different NaCl implementations store the key differently.
+ * https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/ elaborates.
+ * libsodium appears to use the same format as SUPERCOP.
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Keys;
+
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * libsodium Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class libsodium
+{
+    use Common;
+
+    /**
+     * Is invisible flag
+     *
+     */
+    const IS_INVISIBLE = true;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        switch (strlen($key)) {
+            case 32:
+                $public = $key;
+                break;
+            case 64:
+                $private = substr($key, 0, 32);
+                $public = substr($key, -32);
+                break;
+            case 96:
+                $public = substr($key, -32);
+                if (substr($key, 32, 32) != $public) {
+                    throw new \RuntimeException('Keys with 96 bytes should have the 2nd and 3rd set of 32 bytes match');
+                }
+                $private = substr($key, 0, 32);
+                break;
+            default:
+                throw new \RuntimeException('libsodium keys need to either be 32 bytes long, 64 bytes long or 96 bytes long');
+        }
+
+        $curve = new Ed25519();
+        $components = ['curve' => $curve];
+        if (isset($private)) {
+            $arr = $curve->extractSecret($private);
+            $components['dA'] = $arr['dA'];
+            $components['secret'] = $arr['secret'];
+        }
+        $components['QA'] = isset($public) ?
+            self::extractPoint($public, $curve) :
+            $curve->multiplyPoint($curve->getBasePoint(), $components['dA']);
+
+        return $components;
+    }
+
+    /**
+     * Convert an EC public key to the appropriate format
+     *
+     * @param Ed25519 $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @return string
+     */
+    public static function savePublicKey(Ed25519 $curve, array $publicKey)
+    {
+        return $curve->encodePoint($publicKey);
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $privateKey
+     * @param Ed25519 $curve
+     * @param \phpseclib3\Math\Common\FiniteField\Integer[] $publicKey
+     * @param string $secret optional
+     * @param string $password optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $privateKey, Ed25519 $curve, array $publicKey, $secret = null, $password = '')
+    {
+        if (!isset($secret)) {
+            throw new \RuntimeException('Private Key does not have a secret set');
+        }
+        if (strlen($secret) != 32) {
+            throw new \RuntimeException('Private Key secret is not of the correct length');
+        }
+        if (!empty($password) && is_string($password)) {
+            throw new UnsupportedFormatException('libsodium private keys do not support encryption');
+        }
+        return $secret . $curve->encodePoint($publicKey);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/ASN1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * ASN1 Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures in the format described in
+ * https://tools.ietf.org/html/rfc3279#section-2.2.3
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Signature;
+
+use phpseclib3\File\ASN1 as Encoder;
+use phpseclib3\File\ASN1\Maps\EcdsaSigValue;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * ASN1 Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ASN1
+{
+    /**
+     * Loads a signature
+     *
+     * @param string $sig
+     * @return array
+     */
+    public static function load($sig)
+    {
+        if (!is_string($sig)) {
+            return false;
+        }
+
+        $decoded = Encoder::decodeBER($sig);
+        if (empty($decoded)) {
+            return false;
+        }
+        $components = Encoder::asn1map($decoded[0], EcdsaSigValue::MAP);
+
+        return $components;
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s)
+    {
+        return Encoder::encodeDER(compact('r', 's'), EcdsaSigValue::MAP);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/IEEE.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/IEEE.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * IEEE P1363 Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures in the format described in
+ * https://standards.ieee.org/ieee/1363/2049/ and
+ * https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/sign#ecdsa
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Signature;
+
+use phpseclib3\Math\BigInteger;
+
+/**
+ * ASN1 Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class IEEE
+{
+    /**
+     * Loads a signature
+     *
+     * @param string $sig
+     * @return array
+     */
+    public static function load($sig)
+    {
+        if (!is_string($sig)) {
+            return false;
+        }
+
+        $len = strlen($sig);
+        if ($len & 1) {
+            return false;
+        }
+
+        $r = new BigInteger(substr($sig, 0, $len >> 1), 256);
+        $s = new BigInteger(substr($sig, $len >> 1), 256);
+
+        return compact('r', 's');
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @param string $curve
+     * @param int $length
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s, $curve, $length)
+    {
+        $r = $r->toBytes();
+        $s = $s->toBytes();
+        $length = (int) ceil($length / 8);
+        return str_pad($r, $length, "\0", STR_PAD_LEFT) . str_pad($s, $length, "\0", STR_PAD_LEFT);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/Raw.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Raw EC Signature Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Signature;
+
+use phpseclib3\Crypt\Common\Formats\Signature\Raw as Progenitor;
+
+/**
+ * Raw DSA Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Raw extends Progenitor
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/SSH2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Formats/Signature/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,94 @@
+<?php
+
+/**
+ * SSH2 Signature Handler
+ *
+ * PHP version 5
+ *
+ * Handles signatures in the format used by SSH2
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC\Formats\Signature;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * SSH2 Signature Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SSH2
+{
+    /**
+     * Loads a signature
+     *
+     * @param string $sig
+     * @return mixed
+     */
+    public static function load($sig)
+    {
+        if (!is_string($sig)) {
+            return false;
+        }
+
+        $result = Strings::unpackSSH2('ss', $sig);
+        if ($result === false) {
+            return false;
+        }
+        list($type, $blob) = $result;
+        switch ($type) {
+            // see https://tools.ietf.org/html/rfc5656#section-3.1.2
+            case 'ecdsa-sha2-nistp256':
+            case 'ecdsa-sha2-nistp384':
+            case 'ecdsa-sha2-nistp521':
+                break;
+            default:
+                return false;
+        }
+
+        $result = Strings::unpackSSH2('ii', $blob);
+        if ($result === false) {
+            return false;
+        }
+
+        return [
+            'r' => $result[0],
+            's' => $result[1]
+        ];
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @param BigInteger $r
+     * @param BigInteger $s
+     * @param string $curve
+     * @return string
+     */
+    public static function save(BigInteger $r, BigInteger $s, $curve)
+    {
+        switch ($curve) {
+            case 'secp256r1':
+                $curve = 'nistp256';
+                break;
+            case 'secp384r1':
+                $curve = 'nistp384';
+                break;
+            case 'secp521r1':
+                $curve = 'nistp521';
+                break;
+            default:
+                return false;
+        }
+
+        $blob = Strings::packSSH2('ii', $r, $s);
+
+        return Strings::packSSH2('ss', 'ecdsa-sha2-' . $curve, $blob);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Parameters.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/Parameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * EC Parameters
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC;
+
+use phpseclib3\Crypt\EC;
+
+/**
+ * EC Parameters
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class Parameters extends EC
+{
+    /**
+     * Returns the parameters
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type = 'PKCS1', array $options = [])
+    {
+        $type = self::validatePlugin('Keys', 'PKCS1', 'saveParameters');
+
+        return $type::saveParameters($this->curve, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,280 @@
+<?php
+
+/**
+ * EC Private Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\EC;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Crypt\EC\Curves\Curve25519;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Crypt\EC\Formats\Keys\PKCS1;
+use phpseclib3\Crypt\EC\Formats\Signature\ASN1 as ASN1Signature;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Exception\UnsupportedOperationException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * EC Private Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PrivateKey extends EC implements Common\PrivateKey
+{
+    use Common\Traits\PasswordProtected;
+
+    /**
+     * Private Key dA
+     *
+     * sign() converts this to a BigInteger so one might wonder why this is a FiniteFieldInteger instead of
+     * a BigInteger. That's because a FiniteFieldInteger, when converted to a byte string, is null padded by
+     * a certain amount whereas a BigInteger isn't.
+     *
+     * @var object
+     */
+    protected $dA;
+
+    /**
+     * @var string
+     */
+    protected $secret;
+
+    /**
+     * Multiplies an encoded point by the private key
+     *
+     * Used by ECDH
+     *
+     * @param string $coordinates
+     * @return string
+     */
+    public function multiply($coordinates)
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            if ($this->curve instanceof Curve25519 && self::$engines['libsodium']) {
+                return sodium_crypto_scalarmult($this->dA->toBytes(), $coordinates);
+            }
+
+            $point = [$this->curve->convertInteger(new BigInteger(strrev($coordinates), 256))];
+            $point = $this->curve->multiplyPoint($point, $this->dA);
+            return strrev($point[0]->toBytes(true));
+        }
+        if (!$this->curve instanceof TwistedEdwardsCurve) {
+            $coordinates = "\0$coordinates";
+        }
+        $point = PKCS1::extractPoint($coordinates, $this->curve);
+        $point = $this->curve->multiplyPoint($point, $this->dA);
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            return $this->curve->encodePoint($point);
+        }
+        if (empty($point)) {
+            throw new \RuntimeException('The infinity point is invalid');
+        }
+        return "\4" . $point[0]->toBytes(true) . $point[1]->toBytes(true);
+    }
+
+    /**
+     * Create a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @return mixed
+     */
+    public function sign($message)
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            throw new UnsupportedOperationException('Montgomery Curves cannot be used to create signatures');
+        }
+
+        $dA = $this->dA;
+        $order = $this->curve->getOrder();
+
+        $shortFormat = $this->shortFormat;
+        $format = $this->sigFormat;
+        if ($format === false) {
+            return false;
+        }
+
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            if ($this->curve instanceof Ed25519 && self::$engines['libsodium'] && !isset($this->context)) {
+                $result = sodium_crypto_sign_detached($message, $this->withPassword()->toString('libsodium'));
+                return $shortFormat == 'SSH2' ? Strings::packSSH2('ss', 'ssh-' . strtolower($this->getCurve()), $result) : $result;
+            }
+
+            // contexts (Ed25519ctx) are supported but prehashing (Ed25519ph) is not.
+            // quoting https://tools.ietf.org/html/rfc8032#section-8.5 ,
+            // "The Ed25519ph and Ed448ph variants ... SHOULD NOT be used"
+            $A = $this->curve->encodePoint($this->QA);
+            $curve = $this->curve;
+            $hash = new Hash($curve::HASH);
+
+            $secret = substr($hash->hash($this->secret), $curve::SIZE);
+
+            if ($curve instanceof Ed25519) {
+                $dom = !isset($this->context) ? '' :
+                    'SigEd25519 no Ed25519 collisions' . "\0" . chr(strlen($this->context)) . $this->context;
+            } else {
+                $context = isset($this->context) ? $this->context : '';
+                $dom = 'SigEd448' . "\0" . chr(strlen($context)) . $context;
+            }
+            // SHA-512(dom2(F, C) || prefix || PH(M))
+            $r = $hash->hash($dom . $secret . $message);
+            $r = strrev($r);
+            $r = new BigInteger($r, 256);
+            list(, $r) = $r->divide($order);
+            $R = $curve->multiplyPoint($curve->getBasePoint(), $r);
+            $R = $curve->encodePoint($R);
+            $k = $hash->hash($dom . $R . $A . $message);
+            $k = strrev($k);
+            $k = new BigInteger($k, 256);
+            list(, $k) = $k->divide($order);
+            $S = $k->multiply($dA)->add($r);
+            list(, $S) = $S->divide($order);
+            $S = str_pad(strrev($S->toBytes()), $curve::SIZE, "\0");
+            return $shortFormat == 'SSH2' ? Strings::packSSH2('ss', 'ssh-' . strtolower($this->getCurve()), $R . $S) : $R . $S;
+        }
+
+        if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
+            $signature = '';
+            // altho PHP's OpenSSL bindings only supported EC key creation in PHP 7.1 they've long
+            // supported signing / verification
+            // we use specified curves to avoid issues with OpenSSL possibly not supporting a given named curve;
+            // doing this may mean some curve-specific optimizations can't be used but idk if OpenSSL even
+            // has curve-specific optimizations
+            $result = openssl_sign($message, $signature, $this->withPassword()->toString('PKCS8', ['namedCurve' => false]), $this->hash->getHash());
+
+            if ($result) {
+                if ($shortFormat == 'ASN1') {
+                    return $signature;
+                }
+
+                extract(ASN1Signature::load($signature));
+
+                return $this->formatSignature($r, $s);
+            }
+        }
+
+        $e = $this->hash->hash($message);
+        $e = new BigInteger($e, 256);
+
+        $Ln = $this->hash->getLength() - $order->getLength();
+        $z = $Ln > 0 ? $e->bitwise_rightShift($Ln) : $e;
+
+        while (true) {
+            $k = BigInteger::randomRange(self::$one, $order->subtract(self::$one));
+            list($x, $y) = $this->curve->multiplyPoint($this->curve->getBasePoint(), $k);
+            $x = $x->toBigInteger();
+            list(, $r) = $x->divide($order);
+            if ($r->equals(self::$zero)) {
+                continue;
+            }
+            $kinv = $k->modInverse($order);
+            $temp = $z->add($dA->multiply($r));
+            $temp = $kinv->multiply($temp);
+            list(, $s) = $temp->divide($order);
+            if (!$s->equals(self::$zero)) {
+                break;
+            }
+        }
+
+        // the following is an RFC6979 compliant implementation of deterministic ECDSA
+        // it's unused because it's mainly intended for use when a good CSPRNG isn't
+        // available. if phpseclib's CSPRNG isn't good then even key generation is
+        // suspect
+        /*
+        // if this were actually being used it'd probably be better if this lived in load() and createKey()
+        $this->q = $this->curve->getOrder();
+        $dA = $this->dA->toBigInteger();
+        $this->x = $dA;
+
+        $h1 = $this->hash->hash($message);
+        $k = $this->computek($h1);
+        list($x, $y) = $this->curve->multiplyPoint($this->curve->getBasePoint(), $k);
+        $x = $x->toBigInteger();
+        list(, $r) = $x->divide($this->q);
+        $kinv = $k->modInverse($this->q);
+        $h1 = $this->bits2int($h1);
+        $temp = $h1->add($dA->multiply($r));
+        $temp = $kinv->multiply($temp);
+        list(, $s) = $temp->divide($this->q);
+        */
+
+        return $this->formatSignature($r, $s);
+    }
+
+    /**
+     * Returns the private key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePrivateKey');
+
+        return $type::savePrivateKey($this->dA, $this->curve, $this->QA, $this->secret, $this->password, $options);
+    }
+
+    /**
+     * Returns the public key
+     *
+     * @see self::getPrivateKey()
+     * @return mixed
+     */
+    public function getPublicKey()
+    {
+        $format = 'PKCS8';
+        if ($this->curve instanceof MontgomeryCurve) {
+            $format = 'MontgomeryPublic';
+        }
+
+        $type = self::validatePlugin('Keys', $format, 'savePublicKey');
+
+        $key = $type::savePublicKey($this->curve, $this->QA);
+        $key = EC::loadFormat($format, $key);
+        if ($this->curve instanceof MontgomeryCurve) {
+            return $key;
+        }
+        $key = $key
+            ->withHash($this->hash->getHash())
+            ->withSignatureFormat($this->shortFormat);
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            $key = $key->withContext($this->context);
+        }
+        return $key;
+    }
+
+    /**
+     * Returns a signature in the appropriate format
+     *
+     * @return string
+     */
+    private function formatSignature(BigInteger $r, BigInteger $s)
+    {
+        $format = $this->sigFormat;
+
+        $temp = new \ReflectionMethod($format, 'save');
+        $paramCount = $temp->getNumberOfRequiredParameters();
+
+        // @codingStandardsIgnoreStart
+        switch ($paramCount) {
+            case 2: return $format::save($r, $s);
+            case 3: return $format::save($r, $s, $this->getCurve());
+            case 4: return $format::save($r, $s, $this->getCurve(), $this->getLength());
+        }
+        // @codingStandardsIgnoreEnd
+
+        // presumably the only way you could get to this is if you were using a custom plugin
+        throw new UnsupportedOperationException("$format::save() has $paramCount parameters - the only valid parameter counts are 2 or 3");
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/EC/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,172 @@
+<?php
+
+/**
+ * EC Public Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\EC;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\EC;
+use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
+use phpseclib3\Crypt\EC\BaseCurves\TwistedEdwards as TwistedEdwardsCurve;
+use phpseclib3\Crypt\EC\Curves\Ed25519;
+use phpseclib3\Crypt\EC\Formats\Keys\PKCS1;
+use phpseclib3\Crypt\EC\Formats\Signature\ASN1 as ASN1Signature;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Exception\UnsupportedOperationException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * EC Public Key
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PublicKey extends EC implements Common\PublicKey
+{
+    use Common\Traits\Fingerprint;
+
+    /**
+     * Verify a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @param string $signature
+     * @return mixed
+     */
+    public function verify($message, $signature)
+    {
+        if ($this->curve instanceof MontgomeryCurve) {
+            throw new UnsupportedOperationException('Montgomery Curves cannot be used to create signatures');
+        }
+
+        $shortFormat = $this->shortFormat;
+        $format = $this->sigFormat;
+        if ($format === false) {
+            return false;
+        }
+
+        $order = $this->curve->getOrder();
+
+        if ($this->curve instanceof TwistedEdwardsCurve) {
+            if ($shortFormat == 'SSH2') {
+                list(, $signature) = Strings::unpackSSH2('ss', $signature);
+            }
+
+            if ($this->curve instanceof Ed25519 && self::$engines['libsodium'] && !isset($this->context)) {
+                return sodium_crypto_sign_verify_detached($signature, $message, $this->toString('libsodium'));
+            }
+
+            $curve = $this->curve;
+            if (strlen($signature) != 2 * $curve::SIZE) {
+                return false;
+            }
+
+            $R = substr($signature, 0, $curve::SIZE);
+            $S = substr($signature, $curve::SIZE);
+
+            try {
+                $R = PKCS1::extractPoint($R, $curve);
+                $R = $this->curve->convertToInternal($R);
+            } catch (\Exception $e) {
+                return false;
+            }
+
+            $S = strrev($S);
+            $S = new BigInteger($S, 256);
+
+            if ($S->compare($order) >= 0) {
+                return false;
+            }
+
+            $A = $curve->encodePoint($this->QA);
+
+            if ($curve instanceof Ed25519) {
+                $dom2 = !isset($this->context) ? '' :
+                    'SigEd25519 no Ed25519 collisions' . "\0" . chr(strlen($this->context)) . $this->context;
+            } else {
+                $context = isset($this->context) ? $this->context : '';
+                $dom2 = 'SigEd448' . "\0" . chr(strlen($context)) . $context;
+            }
+
+            $hash = new Hash($curve::HASH);
+            $k = $hash->hash($dom2 . substr($signature, 0, $curve::SIZE) . $A . $message);
+            $k = strrev($k);
+            $k = new BigInteger($k, 256);
+            list(, $k) = $k->divide($order);
+
+            $qa = $curve->convertToInternal($this->QA);
+
+            $lhs = $curve->multiplyPoint($curve->getBasePoint(), $S);
+            $rhs = $curve->multiplyPoint($qa, $k);
+            $rhs = $curve->addPoint($rhs, $R);
+            $rhs = $curve->convertToAffine($rhs);
+
+            return $lhs[0]->equals($rhs[0]) && $lhs[1]->equals($rhs[1]);
+        }
+
+        $params = $format::load($signature);
+        if ($params === false || count($params) != 2) {
+            return false;
+        }
+        extract($params);
+
+        if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
+            $sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature;
+
+            $result = openssl_verify($message, $sig, $this->toString('PKCS8', ['namedCurve' => false]), $this->hash->getHash());
+
+            if ($result != -1) {
+                return (bool) $result;
+            }
+        }
+
+        $n_1 = $order->subtract(self::$one);
+        if (!$r->between(self::$one, $n_1) || !$s->between(self::$one, $n_1)) {
+            return false;
+        }
+
+        $e = $this->hash->hash($message);
+        $e = new BigInteger($e, 256);
+
+        $Ln = $this->hash->getLength() - $order->getLength();
+        $z = $Ln > 0 ? $e->bitwise_rightShift($Ln) : $e;
+
+        $w = $s->modInverse($order);
+        list(, $u1) = $z->multiply($w)->divide($order);
+        list(, $u2) = $r->multiply($w)->divide($order);
+
+        $u1 = $this->curve->convertInteger($u1);
+        $u2 = $this->curve->convertInteger($u2);
+
+        list($x1, $y1) = $this->curve->multiplyAddPoints(
+            [$this->curve->getBasePoint(), $this->QA],
+            [$u1, $u2]
+        );
+
+        $x1 = $x1->toBigInteger();
+        list(, $x1) = $x1->divide($order);
+
+        return $x1->equals($r);
+    }
+
+    /**
+     * Returns the public key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePublicKey');
+
+        return $type::savePublicKey($this->curve, $this->QA, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Hash.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Hash.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Hash.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1800 @@
+<?php
+
+/**
+ * Wrapper around hash() and hash_hmac() functions supporting truncated hashes
+ * such as sha256-96.  Any hash algorithm returned by hash_algos() (and
+ * truncated versions thereof) are supported.
+ *
+ * If {@link self::setKey() setKey()} is called, {@link self::hash() hash()} will
+ * return the HMAC as opposed to the hash.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $hash = new \phpseclib3\Crypt\Hash('sha512');
+ *
+ *    $hash->setKey('abcdefg');
+ *
+ *    echo base64_encode($hash->hash('abcdefg'));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @author    Andreas Fischer <bantu@phpbb.com>
+ * @copyright 2015 Andreas Fischer
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\InsufficientSetupException;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\PrimeField;
+
+/**
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Andreas Fischer <bantu@phpbb.com>
+ */
+class Hash
+{
+    /**
+     * Padding Types
+     *
+     */
+    const PADDING_KECCAK = 1;
+
+    /**
+     * Padding Types
+     *
+     */
+    const PADDING_SHA3 = 2;
+
+    /**
+     * Padding Types
+     *
+     */
+    const PADDING_SHAKE = 3;
+
+    /**
+     * Padding Type
+     *
+     * Only used by SHA3
+     *
+     * @var int
+     */
+    private $paddingType = 0;
+
+    /**
+     * Hash Parameter
+     *
+     * @see self::setHash()
+     * @var int
+     */
+    private $hashParam;
+
+    /**
+     * Byte-length of hash output (Internal HMAC)
+     *
+     * @see self::setHash()
+     * @var int
+     */
+    private $length;
+
+    /**
+     * Hash Algorithm
+     *
+     * @see self::setHash()
+     * @var string
+     */
+    private $algo;
+
+    /**
+     * Key
+     *
+     * @see self::setKey()
+     * @var string
+     */
+    private $key = false;
+
+    /**
+     * Nonce
+     *
+     * @see self::setNonce()
+     * @var string
+     */
+    private $nonce = false;
+
+    /**
+     * Hash Parameters
+     *
+     * @var array
+     */
+    private $parameters = [];
+
+    /**
+     * Computed Key
+     *
+     * @see self::_computeKey()
+     * @var string
+     */
+    private $computedKey = false;
+
+    /**
+     * Outer XOR (Internal HMAC)
+     *
+     * Used only for sha512
+     *
+     * @see self::hash()
+     * @var string
+     */
+    private $opad;
+
+    /**
+     * Inner XOR (Internal HMAC)
+     *
+     * Used only for sha512
+     *
+     * @see self::hash()
+     * @var string
+     */
+    private $ipad;
+
+    /**
+     * Recompute AES Key
+     *
+     * Used only for umac
+     *
+     * @see self::hash()
+     * @var boolean
+     */
+    private $recomputeAESKey;
+
+    /**
+     * umac cipher object
+     *
+     * @see self::hash()
+     * @var AES
+     */
+    private $c;
+
+    /**
+     * umac pad
+     *
+     * @see self::hash()
+     * @var string
+     */
+    private $pad;
+
+    /**
+     * Block Size
+     *
+     * @var int
+     */
+    private $blockSize;
+
+    /**#@+
+     * UMAC variables
+     *
+     * @var PrimeField
+     */
+    private static $factory36;
+    private static $factory64;
+    private static $factory128;
+    private static $offset64;
+    private static $offset128;
+    private static $marker64;
+    private static $marker128;
+    private static $maxwordrange64;
+    private static $maxwordrange128;
+    /**#@-*/
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $hash
+     */
+    public function __construct($hash = 'sha256')
+    {
+        $this->setHash($hash);
+    }
+
+    /**
+     * Sets the key for HMACs
+     *
+     * Keys can be of any length.
+     *
+     * @param string $key
+     */
+    public function setKey($key = false)
+    {
+        $this->key = $key;
+        $this->computeKey();
+        $this->recomputeAESKey = true;
+    }
+
+    /**
+     * Sets the nonce for UMACs
+     *
+     * Keys can be of any length.
+     *
+     * @param string $nonce
+     */
+    public function setNonce($nonce = false)
+    {
+        switch (true) {
+            case !is_string($nonce):
+            case strlen($nonce) > 0 && strlen($nonce) <= 16:
+                $this->recomputeAESKey = true;
+                $this->nonce = $nonce;
+                return;
+        }
+
+        throw new \LengthException('The nonce length must be between 1 and 16 bytes, inclusive');
+    }
+
+    /**
+     * Pre-compute the key used by the HMAC
+     *
+     * Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
+     * will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
+     *
+     * As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
+     * when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
+     * every call
+     *
+     */
+    private function computeKey()
+    {
+        if ($this->key === false) {
+            $this->computedKey = false;
+            return;
+        }
+
+        if (strlen($this->key) <= $this->getBlockLengthInBytes()) {
+            $this->computedKey = $this->key;
+            return;
+        }
+
+        $this->computedKey = is_array($this->algo) ?
+            call_user_func($this->algo, $this->key) :
+            hash($this->algo, $this->key, true);
+    }
+
+    /**
+     * Gets the hash function.
+     *
+     * As set by the constructor or by the setHash() method.
+     *
+     * @return string
+     */
+    public function getHash()
+    {
+        return $this->hashParam;
+    }
+
+    /**
+     * Sets the hash function.
+     *
+     * @param string $hash
+     */
+    public function setHash($hash)
+    {
+        $oldHash = $this->hashParam;
+        $this->hashParam = $hash = strtolower($hash);
+        switch ($hash) {
+            case 'umac-32':
+            case 'umac-64':
+            case 'umac-96':
+            case 'umac-128':
+                if ($oldHash != $this->hashParam) {
+                    $this->recomputeAESKey = true;
+                }
+                $this->blockSize = 128;
+                $this->length = abs(substr($hash, -3)) >> 3;
+                $this->algo = 'umac';
+                return;
+            case 'md2-96':
+            case 'md5-96':
+            case 'sha1-96':
+            case 'sha224-96':
+            case 'sha256-96':
+            case 'sha384-96':
+            case 'sha512-96':
+            case 'sha512/224-96':
+            case 'sha512/256-96':
+                $hash = substr($hash, 0, -3);
+                $this->length = 12; // 96 / 8 = 12
+                break;
+            case 'md2':
+            case 'md5':
+                $this->length = 16;
+                break;
+            case 'sha1':
+                $this->length = 20;
+                break;
+            case 'sha224':
+            case 'sha512/224':
+            case 'sha3-224':
+                $this->length = 28;
+                break;
+            case 'keccak256':
+                $this->paddingType = self::PADDING_KECCAK;
+                // fall-through
+            case 'sha256':
+            case 'sha512/256':
+            case 'sha3-256':
+                $this->length = 32;
+                break;
+            case 'sha384':
+            case 'sha3-384':
+                $this->length = 48;
+                break;
+            case 'sha512':
+            case 'sha3-512':
+                $this->length = 64;
+                break;
+            default:
+                if (preg_match('#^(shake(?:128|256))-(\d+)$#', $hash, $matches)) {
+                    $this->paddingType = self::PADDING_SHAKE;
+                    $hash = $matches[1];
+                    $this->length = $matches[2] >> 3;
+                } else {
+                    throw new UnsupportedAlgorithmException(
+                        "$hash is not a supported algorithm"
+                    );
+                }
+        }
+
+        switch ($hash) {
+            case 'md2':
+            case 'md2-96':
+                $this->blockSize = 128;
+                break;
+            case 'md5-96':
+            case 'sha1-96':
+            case 'sha224-96':
+            case 'sha256-96':
+            case 'md5':
+            case 'sha1':
+            case 'sha224':
+            case 'sha256':
+                $this->blockSize = 512;
+                break;
+            case 'sha3-224':
+                $this->blockSize = 1152; // 1600 - 2*224
+                break;
+            case 'sha3-256':
+            case 'shake256':
+            case 'keccak256':
+                $this->blockSize = 1088; // 1600 - 2*256
+                break;
+            case 'sha3-384':
+                $this->blockSize = 832; // 1600 - 2*384
+                break;
+            case 'sha3-512':
+                $this->blockSize = 576; // 1600 - 2*512
+                break;
+            case 'shake128':
+                $this->blockSize = 1344; // 1600 - 2*128
+                break;
+            default:
+                $this->blockSize = 1024;
+        }
+
+        if (in_array(substr($hash, 0, 5), ['sha3-', 'shake', 'kecca'])) {
+            // PHP 7.1.0 introduced support for "SHA3 fixed mode algorithms":
+            // http://php.net/ChangeLog-7.php#7.1.0
+            if (version_compare(PHP_VERSION, '7.1.0') < 0 || substr($hash, 0, 5) != 'sha3-') {
+                //preg_match('#(\d+)$#', $hash, $matches);
+                //$this->parameters['capacity'] = 2 * $matches[1]; // 1600 - $this->blockSize
+                //$this->parameters['rate'] = 1600 - $this->parameters['capacity']; // == $this->blockSize
+                if (!$this->paddingType) {
+                    $this->paddingType = self::PADDING_SHA3;
+                }
+                $this->parameters = [
+                    'capacity' => 1600 - $this->blockSize,
+                    'rate' => $this->blockSize,
+                    'length' => $this->length,
+                    'padding' => $this->paddingType
+                ];
+                $hash = ['phpseclib3\Crypt\Hash', PHP_INT_SIZE == 8 ? 'sha3_64' : 'sha3_32'];
+            }
+        }
+
+        if ($hash == 'sha512/224' || $hash == 'sha512/256') {
+            // PHP 7.1.0 introduced sha512/224 and sha512/256 support:
+            // http://php.net/ChangeLog-7.php#7.1.0
+            if (version_compare(PHP_VERSION, '7.1.0') < 0) {
+                // from http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf#page=24
+                $initial = $hash == 'sha512/256' ?
+                    [
+                        '22312194FC2BF72C', '9F555FA3C84C64C2', '2393B86B6F53B151', '963877195940EABD',
+                        '96283EE2A88EFFE3', 'BE5E1E2553863992', '2B0199FC2C85B8AA', '0EB72DDC81C52CA2'
+                    ] :
+                    [
+                        '8C3D37C819544DA2', '73E1996689DCD4D6', '1DFAB7AE32FF9C82', '679DD514582F9FCF',
+                        '0F6D2B697BD44DA8', '77E36F7304C48942', '3F9D85A86A1D36C8', '1112E6AD91D692A1'
+                    ];
+                for ($i = 0; $i < 8; $i++) {
+                    if (PHP_INT_SIZE == 8) {
+                        list(, $initial[$i]) = unpack('J', pack('H*', $initial[$i]));
+                    } else {
+                        $initial[$i] = new BigInteger($initial[$i], 16);
+                        $initial[$i]->setPrecision(64);
+                    }
+                }
+
+                $this->parameters = compact('initial');
+
+                $hash = ['phpseclib3\Crypt\Hash', PHP_INT_SIZE == 8 ? 'sha512_64' : 'sha512'];
+            }
+        }
+
+        if (is_array($hash)) {
+            $b = $this->blockSize >> 3;
+            $this->ipad = str_repeat(chr(0x36), $b);
+            $this->opad = str_repeat(chr(0x5C), $b);
+        }
+
+        $this->algo = $hash;
+
+        $this->computeKey();
+    }
+
+    /**
+     * KDF: Key-Derivation Function
+     *
+     * The key-derivation function generates pseudorandom bits used to key the hash functions.
+     *
+     * @param int $index a non-negative integer less than 2^64
+     * @param int $numbytes a non-negative integer less than 2^64
+     * @return string string of length numbytes bytes
+     */
+    private function kdf($index, $numbytes)
+    {
+        $this->c->setIV(pack('N4', 0, $index, 0, 1));
+
+        return $this->c->encrypt(str_repeat("\0", $numbytes));
+    }
+
+    /**
+     * PDF Algorithm
+     *
+     * @return string string of length taglen bytes.
+     */
+    private function pdf()
+    {
+        $k = $this->key;
+        $nonce = $this->nonce;
+        $taglen = $this->length;
+
+        //
+        // Extract and zero low bit(s) of Nonce if needed
+        //
+        if ($taglen <= 8) {
+            $last = strlen($nonce) - 1;
+            $mask = $taglen == 4 ? "\3" : "\1";
+            $index = $nonce[$last] & $mask;
+            $nonce[$last] = $nonce[$last] ^ $index;
+        }
+
+        //
+        // Make Nonce BLOCKLEN bytes by appending zeroes if needed
+        //
+        $nonce = str_pad($nonce, 16, "\0");
+
+        //
+        // Generate subkey, encipher and extract indexed substring
+        //
+        $kp = $this->kdf(0, 16);
+        $c = new AES('ctr');
+        $c->disablePadding();
+        $c->setKey($kp);
+        $c->setIV($nonce);
+        $t = $c->encrypt("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
+
+        // we could use ord() but per https://paragonie.com/blog/2016/06/constant-time-encoding-boring-cryptography-rfc-4648-and-you
+        // unpack() doesn't leak timing info
+        return $taglen <= 8 ?
+            substr($t, unpack('C', $index)[1] * $taglen, $taglen) :
+            substr($t, 0, $taglen);
+    }
+
+    /**
+     * UHASH Algorithm
+     *
+     * @param string $m string of length less than 2^67 bits.
+     * @param int $taglen the integer 4, 8, 12 or 16.
+     * @return string string of length taglen bytes.
+     */
+    private function uhash($m, $taglen)
+    {
+        //
+        // One internal iteration per 4 bytes of output
+        //
+        $iters = $taglen >> 2;
+
+        //
+        // Define total key needed for all iterations using KDF.
+        // L1Key reuses most key material between iterations.
+        //
+        //$L1Key  = $this->kdf(1, 1024 + ($iters - 1) * 16);
+        $L1Key  = $this->kdf(1, (1024 + ($iters - 1)) * 16);
+        $L2Key  = $this->kdf(2, $iters * 24);
+        $L3Key1 = $this->kdf(3, $iters * 64);
+        $L3Key2 = $this->kdf(4, $iters * 4);
+
+        //
+        // For each iteration, extract key and do three-layer hash.
+        // If bytelength(M) <= 1024, then skip L2-HASH.
+        //
+        $y = '';
+        for ($i = 0; $i < $iters; $i++) {
+            $L1Key_i  = substr($L1Key, $i * 16, 1024);
+            $L2Key_i  = substr($L2Key, $i * 24, 24);
+            $L3Key1_i = substr($L3Key1, $i * 64, 64);
+            $L3Key2_i = substr($L3Key2, $i * 4, 4);
+
+            $a = self::L1Hash($L1Key_i, $m);
+            $b = strlen($m) <= 1024 ? "\0\0\0\0\0\0\0\0$a" : self::L2Hash($L2Key_i, $a);
+            $c = self::L3Hash($L3Key1_i, $L3Key2_i, $b);
+            $y .= $c;
+        }
+
+        return $y;
+    }
+
+    /**
+     * L1-HASH Algorithm
+     *
+     * The first-layer hash breaks the message into 1024-byte chunks and
+     * hashes each with a function called NH.  Concatenating the results
+     * forms a string, which is up to 128 times shorter than the original.
+     *
+     * @param string $k string of length 1024 bytes.
+     * @param string $m string of length less than 2^67 bits.
+     * @return string string of length (8 * ceil(bitlength(M)/8192)) bytes.
+     */
+    private static function L1Hash($k, $m)
+    {
+        //
+        // Break M into 1024 byte chunks (final chunk may be shorter)
+        //
+        $m = str_split($m, 1024);
+
+        //
+        // For each chunk, except the last: endian-adjust, NH hash
+        // and add bit-length.  Use results to build Y.
+        //
+        $length = 1024 * 8;
+        $y = '';
+
+        for ($i = 0; $i < count($m) - 1; $i++) {
+            $m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
+            $y .= PHP_INT_SIZE == 8 ?
+                static::nh64($k, $m[$i], $length) :
+                static::nh32($k, $m[$i], $length);
+        }
+
+        //
+        // For the last chunk: pad to 32-byte boundary, endian-adjust,
+        // NH hash and add bit-length.  Concatenate the result to Y.
+        //
+        $length = count($m) ? strlen($m[$i]) : 0;
+        $pad = 32 - ($length % 32);
+        $pad = max(32, $length + $pad % 32);
+        $m[$i] = str_pad(isset($m[$i]) ? $m[$i] : '', $pad, "\0"); // zeropad
+        $m[$i] = pack('N*', ...unpack('V*', $m[$i])); // ENDIAN-SWAP
+
+        $y .= PHP_INT_SIZE == 8 ?
+            static::nh64($k, $m[$i], $length * 8) :
+            static::nh32($k, $m[$i], $length * 8);
+
+        return $y;
+    }
+
+    /**
+     * 32-bit safe 64-bit Multiply with 2x 32-bit ints
+     *
+     * @param int $x
+     * @param int $y
+     * @return string $x * $y
+     */
+    private static function mul32_64($x, $y)
+    {
+        // see mul64() for a more detailed explanation of how this works
+
+        $x1 = ($x >> 16) & 0xFFFF;
+        $x0 = $x & 0xFFFF;
+
+        $y1 = ($y >> 16) & 0xFFFF;
+        $y0 = $y & 0xFFFF;
+
+        // the following 3x lines will possibly yield floats
+        $z2 = $x1 * $y1;
+        $z0 = $x0 * $y0;
+        $z1 = $x1 * $y0 + $x0 * $y1;
+
+        $a = intval(fmod($z0, 65536));
+        $b = intval($z0 / 65536) + intval(fmod($z1, 65536));
+        $c = intval($z1 / 65536) + intval(fmod($z2, 65536)) + intval($b / 65536);
+        $b = intval(fmod($b, 65536));
+        $d = intval($z2 / 65536) + intval($c / 65536);
+        $c = intval(fmod($c, 65536));
+        $d = intval(fmod($d, 65536));
+
+        return pack('n4', $d, $c, $b, $a);
+    }
+
+    /**
+     * 32-bit safe 64-bit Addition with 2x 64-bit strings
+     *
+     * @param int $x
+     * @param int $y
+     * @return int $x * $y
+     */
+    private static function add32_64($x, $y)
+    {
+        list(, $x1, $x2, $x3, $x4) = unpack('n4', $x);
+        list(, $y1, $y2, $y3, $y4) = unpack('n4', $y);
+        $a = $x4 + $y4;
+        $b = $x3 + $y3 + ($a >> 16);
+        $c = $x2 + $y2 + ($b >> 16);
+        $d = $x1 + $y1 + ($c >> 16);
+        return pack('n4', $d, $c, $b, $a);
+    }
+
+    /**
+     * 32-bit safe 32-bit Addition with 2x 32-bit strings
+     *
+     * @param int $x
+     * @param int $y
+     * @return int $x * $y
+     */
+    private static function add32($x, $y)
+    {
+        // see add64() for a more detailed explanation of how this works
+
+        $x1 = $x & 0xFFFF;
+        $x2 = ($x >> 16) & 0xFFFF;
+        $y1 = $y & 0xFFFF;
+        $y2 = ($y >> 16) & 0xFFFF;
+
+        $a = $x1 + $y1;
+        $b = ($x2 + $y2 + ($a >> 16)) << 16;
+        $a &= 0xFFFF;
+
+        return $a | $b;
+    }
+
+    /**
+     * NH Algorithm / 32-bit safe
+     *
+     * @param string $k string of length 1024 bytes.
+     * @param string $m string with length divisible by 32 bytes.
+     * @return string string of length 8 bytes.
+     */
+    private static function nh32($k, $m, $length)
+    {
+        //
+        // Break M and K into 4-byte chunks
+        //
+        $k = unpack('N*', $k);
+        $m = unpack('N*', $m);
+        $t = count($m);
+
+        //
+        // Perform NH hash on the chunks, pairing words for multiplication
+        // which are 4 apart to accommodate vector-parallelism.
+        //
+        $i = 1;
+        $y = "\0\0\0\0\0\0\0\0";
+        while ($i <= $t) {
+            $temp  = self::add32($m[$i], $k[$i]);
+            $temp2 = self::add32($m[$i + 4], $k[$i + 4]);
+            $y = self::add32_64($y, self::mul32_64($temp, $temp2));
+
+            $temp  = self::add32($m[$i + 1], $k[$i + 1]);
+            $temp2 = self::add32($m[$i + 5], $k[$i + 5]);
+            $y = self::add32_64($y, self::mul32_64($temp, $temp2));
+
+            $temp  = self::add32($m[$i + 2], $k[$i + 2]);
+            $temp2 = self::add32($m[$i + 6], $k[$i + 6]);
+            $y = self::add32_64($y, self::mul32_64($temp, $temp2));
+
+            $temp  = self::add32($m[$i + 3], $k[$i + 3]);
+            $temp2 = self::add32($m[$i + 7], $k[$i + 7]);
+            $y = self::add32_64($y, self::mul32_64($temp, $temp2));
+
+            $i += 8;
+        }
+
+        return self::add32_64($y, pack('N2', 0, $length));
+    }
+
+    /**
+     * 64-bit Multiply with 2x 32-bit ints
+     *
+     * @param int $x
+     * @param int $y
+     * @return int $x * $y
+     */
+    private static function mul64($x, $y)
+    {
+        // since PHP doesn't implement unsigned integers we'll implement them with signed integers
+        // to do this we'll use karatsuba multiplication
+
+        $x1 = $x >> 16;
+        $x0 = $x & 0xFFFF;
+
+        $y1 = $y >> 16;
+        $y0 = $y & 0xFFFF;
+
+        $z2 = $x1 * $y1; // up to 32 bits long
+        $z0 = $x0 * $y0; // up to 32 bits long
+        $z1 = $x1 * $y0 + $x0 * $y1; // up to 33 bit long
+        // normally karatsuba multiplication calculates $z1 thusly:
+        //$z1 = ($x1 + $x0) * ($y0 + $y1) - $z2 - $z0;
+        // the idea being to eliminate one extra multiplication. for arbitrary precision math that makes sense
+        // but not for this purpose
+
+        // at this point karatsuba would normally return this:
+        //return ($z2 << 64) + ($z1 << 32) + $z0;
+        // the problem is that the output could be out of range for signed 64-bit ints,
+        // which would cause PHP to switch to floats, which would risk losing the lower few bits
+        // as such we'll OR 4x 16-bit blocks together like so:
+        /*
+          ........  |  ........  |  ........  |  ........
+          upper $z2 |  lower $z2 |  lower $z1 |  lower $z0
+                    | +upper $z1 | +upper $z0 |
+         +   $carry | +   $carry |            |
+        */
+        // technically upper $z1 is 17 bit - not 16 - but the most significant digit of that will
+        // just get added to $carry
+
+        $a = $z0 & 0xFFFF;
+        $b = ($z0 >> 16) + ($z1 & 0xFFFF);
+        $c = ($z1 >> 16) + ($z2 & 0xFFFF) + ($b >> 16);
+        $b = ($b & 0xFFFF) << 16;
+        $d = ($z2 >> 16) + ($c >> 16);
+        $c = ($c & 0xFFFF) << 32;
+        $d = ($d & 0xFFFF) << 48;
+
+        return $a | $b | $c | $d;
+    }
+
+    /**
+     * 64-bit Addition with 2x 64-bit ints
+     *
+     * @param int $x
+     * @param int $y
+     * @return int $x + $y
+     */
+    private static function add64($x, $y)
+    {
+        // doing $x + $y risks returning a result that's out of range for signed 64-bit ints
+        // in that event PHP would convert the result to a float and precision would be lost
+        // so we'll just add 2x 32-bit ints together like so:
+        /*
+           ........ | ........
+           upper $x | lower $x
+          +upper $y |+lower $y
+          +  $carry |
+        */
+        $x1 = $x & 0xFFFFFFFF;
+        $x2 = ($x >> 32) & 0xFFFFFFFF;
+        $y1 = $y & 0xFFFFFFFF;
+        $y2 = ($y >> 32) & 0xFFFFFFFF;
+
+        $a = $x1 + $y1;
+        $b = ($x2 + $y2 + ($a >> 32)) << 32;
+        $a &= 0xFFFFFFFF;
+
+        return $a | $b;
+    }
+
+    /**
+     * NH Algorithm / 64-bit safe
+     *
+     * @param string $k string of length 1024 bytes.
+     * @param string $m string with length divisible by 32 bytes.
+     * @return string string of length 8 bytes.
+     */
+    private static function nh64($k, $m, $length)
+    {
+        //
+        // Break M and K into 4-byte chunks
+        //
+        $k = unpack('N*', $k);
+        $m = unpack('N*', $m);
+        $t = count($m);
+
+        //
+        // Perform NH hash on the chunks, pairing words for multiplication
+        // which are 4 apart to accommodate vector-parallelism.
+        //
+        $i = 1;
+        $y = 0;
+        while ($i <= $t) {
+            $temp  = ($m[$i] + $k[$i]) & 0xFFFFFFFF;
+            $temp2 = ($m[$i + 4] + $k[$i + 4]) & 0xFFFFFFFF;
+            $y = self::add64($y, self::mul64($temp, $temp2));
+
+            $temp  = ($m[$i + 1] + $k[$i + 1]) & 0xFFFFFFFF;
+            $temp2 = ($m[$i + 5] + $k[$i + 5]) & 0xFFFFFFFF;
+            $y = self::add64($y, self::mul64($temp, $temp2));
+
+            $temp  = ($m[$i + 2] + $k[$i + 2]) & 0xFFFFFFFF;
+            $temp2 = ($m[$i + 6] + $k[$i + 6]) & 0xFFFFFFFF;
+            $y = self::add64($y, self::mul64($temp, $temp2));
+
+            $temp  = ($m[$i + 3] + $k[$i + 3]) & 0xFFFFFFFF;
+            $temp2 = ($m[$i + 7] + $k[$i + 7]) & 0xFFFFFFFF;
+            $y = self::add64($y, self::mul64($temp, $temp2));
+
+            $i += 8;
+        }
+
+        return pack('J', self::add64($y, $length));
+    }
+
+    /**
+     * L2-HASH: Second-Layer Hash
+     *
+     * The second-layer rehashes the L1-HASH output using a polynomial hash
+     * called POLY.  If the L1-HASH output is long, then POLY is called once
+     * on a prefix of the L1-HASH output and called using different settings
+     * on the remainder.  (This two-step hashing of the L1-HASH output is
+     * needed only if the message length is greater than 16 megabytes.)
+     * Careful implementation of POLY is necessary to avoid a possible
+     * timing attack (see Section 6.6 for more information).
+     *
+     * @param string $k string of length 24 bytes.
+     * @param string $m string of length less than 2^64 bytes.
+     * @return string string of length 16 bytes.
+     */
+    private static function L2Hash($k, $m)
+    {
+        //
+        //  Extract keys and restrict to special key-sets
+        //
+        $k64 = $k & "\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF";
+        $k64 = new BigInteger($k64, 256);
+        $k128 = substr($k, 8) & "\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF\x01\xFF\xFF\xFF";
+        $k128 = new BigInteger($k128, 256);
+
+        //
+        // If M is no more than 2^17 bytes, hash under 64-bit prime,
+        // otherwise, hash first 2^17 bytes under 64-bit prime and
+        // remainder under 128-bit prime.
+        //
+        if (strlen($m) <= 0x20000) { // 2^14 64-bit words
+            $y = self::poly(64, self::$maxwordrange64, $k64, $m);
+        } else {
+            $m_1 = substr($m, 0, 0x20000); // 1 << 17
+            $m_2 = substr($m, 0x20000) . "\x80";
+            $length = strlen($m_2);
+            $pad = 16 - ($length % 16);
+            $pad %= 16;
+            $m_2 = str_pad($m_2, $length + $pad, "\0"); // zeropad
+            $y = self::poly(64, self::$maxwordrange64, $k64, $m_1);
+            $y = str_pad($y, 16, "\0", STR_PAD_LEFT);
+            $y = self::poly(128, self::$maxwordrange128, $k128, $y . $m_2);
+        }
+
+        return str_pad($y, 16, "\0", STR_PAD_LEFT);
+    }
+
+    /**
+     * POLY Algorithm
+     *
+     * @param int $wordbits the integer 64 or 128.
+     * @param BigInteger $maxwordrange positive integer less than 2^wordbits.
+     * @param BigInteger $k integer in the range 0 ... prime(wordbits) - 1.
+     * @param string $m string with length divisible by (wordbits / 8) bytes.
+     * @return integer in the range 0 ... prime(wordbits) - 1.
+     */
+    private static function poly($wordbits, $maxwordrange, $k, $m)
+    {
+        //
+        // Define constants used for fixing out-of-range words
+        //
+        $wordbytes = $wordbits >> 3;
+        if ($wordbits == 128) {
+            $factory = self::$factory128;
+            $offset = self::$offset128;
+            $marker = self::$marker128;
+        } else {
+            $factory = self::$factory64;
+            $offset = self::$offset64;
+            $marker = self::$marker64;
+        }
+
+        $k = $factory->newInteger($k);
+
+        //
+        // Break M into chunks of length wordbytes bytes
+        //
+        $m_i = str_split($m, $wordbytes);
+
+        //
+        // Each input word m is compared with maxwordrange.  If not smaller
+        // then 'marker' and (m - offset), both in range, are hashed.
+        //
+        $y = $factory->newInteger(new BigInteger(1));
+        foreach ($m_i as $m) {
+            $m = $factory->newInteger(new BigInteger($m, 256));
+            if ($m->compare($maxwordrange) >= 0) {
+                $y = $k->multiply($y)->add($marker);
+                $y = $k->multiply($y)->add($m->subtract($offset));
+            } else {
+                $y = $k->multiply($y)->add($m);
+            }
+        }
+
+        return $y->toBytes();
+    }
+
+    /**
+     * L3-HASH: Third-Layer Hash
+     *
+     * The output from L2-HASH is 16 bytes long.  This final hash function
+     * hashes the 16-byte string to a fixed length of 4 bytes.
+     *
+     * @param string $k1 string of length 64 bytes.
+     * @param string $k2 string of length 4 bytes.
+     * @param string $m string of length 16 bytes.
+     * @return string string of length 4 bytes.
+     */
+    private static function L3Hash($k1, $k2, $m)
+    {
+        $factory = self::$factory36;
+
+        $y = $factory->newInteger(new BigInteger());
+        for ($i = 0; $i < 8; $i++) {
+            $m_i = $factory->newInteger(new BigInteger(substr($m, 2 * $i, 2), 256));
+            $k_i = $factory->newInteger(new BigInteger(substr($k1, 8 * $i, 8), 256));
+            $y = $y->add($m_i->multiply($k_i));
+        }
+        $y = str_pad(substr($y->toBytes(), -4), 4, "\0", STR_PAD_LEFT);
+        $y = $y ^ $k2;
+
+        return $y;
+    }
+
+    /**
+     * Compute the Hash / HMAC / UMAC.
+     *
+     * @param string $text
+     * @return string
+     */
+    public function hash($text)
+    {
+        $algo = $this->algo;
+        if ($algo == 'umac') {
+            if ($this->recomputeAESKey) {
+                if (!is_string($this->nonce)) {
+                    throw new InsufficientSetupException('No nonce has been set');
+                }
+                if (!is_string($this->key)) {
+                    throw new InsufficientSetupException('No key has been set');
+                }
+                if (strlen($this->key) != 16) {
+                    throw new \LengthException('Key must be 16 bytes long');
+                }
+
+                if (!isset(self::$maxwordrange64)) {
+                    $one = new BigInteger(1);
+
+                    $prime36 = new BigInteger("\x00\x00\x00\x0F\xFF\xFF\xFF\xFB", 256);
+                    self::$factory36 = new PrimeField($prime36);
+
+                    $prime64 = new BigInteger("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xC5", 256);
+                    self::$factory64 = new PrimeField($prime64);
+
+                    $prime128 = new BigInteger("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x61", 256);
+                    self::$factory128 = new PrimeField($prime128);
+
+                    self::$offset64 = new BigInteger("\1\0\0\0\0\0\0\0\0", 256);
+                    self::$offset64 = self::$factory64->newInteger(self::$offset64->subtract($prime64));
+                    self::$offset128 = new BigInteger("\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 256);
+                    self::$offset128 = self::$factory128->newInteger(self::$offset128->subtract($prime128));
+
+                    self::$marker64 = self::$factory64->newInteger($prime64->subtract($one));
+                    self::$marker128 = self::$factory128->newInteger($prime128->subtract($one));
+
+                    $maxwordrange64 = $one->bitwise_leftShift(64)->subtract($one->bitwise_leftShift(32));
+                    self::$maxwordrange64 = self::$factory64->newInteger($maxwordrange64);
+
+                    $maxwordrange128 = $one->bitwise_leftShift(128)->subtract($one->bitwise_leftShift(96));
+                    self::$maxwordrange128 = self::$factory128->newInteger($maxwordrange128);
+                }
+
+                $this->c = new AES('ctr');
+                $this->c->disablePadding();
+                $this->c->setKey($this->key);
+
+                $this->pad = $this->pdf();
+
+                $this->recomputeAESKey = false;
+            }
+
+            $hashedmessage = $this->uhash($text, $this->length);
+            return $hashedmessage ^ $this->pad;
+        }
+
+        if (is_array($algo)) {
+            if (empty($this->key) || !is_string($this->key)) {
+                return substr($algo($text, ...array_values($this->parameters)), 0, $this->length);
+            }
+
+            // SHA3 HMACs are discussed at https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=30
+
+            $key    = str_pad($this->computedKey, $b, chr(0));
+            $temp   = $this->ipad ^ $key;
+            $temp  .= $text;
+            $temp   = substr($algo($temp, ...array_values($this->parameters)), 0, $this->length);
+            $output = $this->opad ^ $key;
+            $output .= $temp;
+            $output = $algo($output, ...array_values($this->parameters));
+
+            return substr($output, 0, $this->length);
+        }
+
+        $output = !empty($this->key) || is_string($this->key) ?
+            hash_hmac($algo, $text, $this->computedKey, true) :
+            hash($algo, $text, true);
+
+        return strlen($output) > $this->length
+            ? substr($output, 0, $this->length)
+            : $output;
+    }
+
+    /**
+     * Returns the hash length (in bits)
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return $this->length << 3;
+    }
+
+    /**
+     * Returns the hash length (in bytes)
+     *
+     * @return int
+     */
+    public function getLengthInBytes()
+    {
+        return $this->length;
+    }
+
+    /**
+     * Returns the block length (in bits)
+     *
+     * @return int
+     */
+    public function getBlockLength()
+    {
+        return $this->blockSize;
+    }
+
+    /**
+     * Returns the block length (in bytes)
+     *
+     * @return int
+     */
+    public function getBlockLengthInBytes()
+    {
+        return $this->blockSize >> 3;
+    }
+
+    /**
+     * Pads SHA3 based on the mode
+     *
+     * @param int $padLength
+     * @param int $padType
+     * @return string
+     */
+    private static function sha3_pad($padLength, $padType)
+    {
+        switch ($padType) {
+            case self::PADDING_KECCAK:
+                $temp = chr(0x01) . str_repeat("\0", $padLength - 1);
+                $temp[$padLength - 1] = $temp[$padLength - 1] | chr(0x80);
+                return $temp;
+            case self::PADDING_SHAKE:
+                $temp = chr(0x1F) . str_repeat("\0", $padLength - 1);
+                $temp[$padLength - 1] = $temp[$padLength - 1] | chr(0x80);
+                return $temp;
+            //case self::PADDING_SHA3:
+            default:
+                // from https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=36
+                return $padLength == 1 ? chr(0x86) : chr(0x06) . str_repeat("\0", $padLength - 2) . chr(0x80);
+        }
+    }
+
+    /**
+     * Pure-PHP 32-bit implementation of SHA3
+     *
+     * Whereas BigInteger.php's 32-bit engine works on PHP 64-bit this 32-bit implementation
+     * of SHA3 will *not* work on PHP 64-bit. This is because this implementation
+     * employees bitwise NOTs and bitwise left shifts. And the round constants only work
+     * on 32-bit PHP. eg. dechex(-2147483648) returns 80000000 on 32-bit PHP and
+     * FFFFFFFF80000000 on 64-bit PHP. Sure, we could do bitwise ANDs but that would slow
+     * things down.
+     *
+     * SHA512 requires BigInteger to simulate 64-bit unsigned integers because SHA2 employees
+     * addition whereas SHA3 just employees bitwise operators. PHP64 only supports signed
+     * 64-bit integers, which complicates addition, whereas that limitation isn't an issue
+     * for SHA3.
+     *
+     * In https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=919061#page=16 KECCAK[C] is
+     * defined as "the KECCAK instance with KECCAK-f[1600] as the underlying permutation and
+     * capacity c". This is relevant because, altho the KECCAK standard defines a mode
+     * (KECCAK-f[800]) designed for 32-bit machines that mode is incompatible with SHA3
+     *
+     * @param string $p
+     * @param int $c
+     * @param int $r
+     * @param int $d
+     * @param int $padType
+     */
+    private static function sha3_32($p, $c, $r, $d, $padType)
+    {
+        $block_size = $r >> 3;
+        $padLength = $block_size - (strlen($p) % $block_size);
+        $num_ints = $block_size >> 2;
+
+        $p .= static::sha3_pad($padLength, $padType);
+
+        $n = strlen($p) / $r; // number of blocks
+
+        $s = [
+            [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
+            [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
+            [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
+            [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]],
+            [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]]
+        ];
+
+        $p = str_split($p, $block_size);
+
+        foreach ($p as $pi) {
+            $pi = unpack('V*', $pi);
+            $x = $y = 0;
+            for ($i = 1; $i <= $num_ints; $i += 2) {
+                $s[$x][$y][0] ^= $pi[$i + 1];
+                $s[$x][$y][1] ^= $pi[$i];
+                if (++$y == 5) {
+                    $y = 0;
+                    $x++;
+                }
+            }
+            static::processSHA3Block32($s);
+        }
+
+        $z = '';
+        $i = $j = 0;
+        while (strlen($z) < $d) {
+            $z .= pack('V2', $s[$i][$j][1], $s[$i][$j++][0]);
+            if ($j == 5) {
+                $j = 0;
+                $i++;
+                if ($i == 5) {
+                    $i = 0;
+                    static::processSHA3Block32($s);
+                }
+            }
+        }
+
+        return $z;
+    }
+
+    /**
+     * 32-bit block processing method for SHA3
+     *
+     * @param array $s
+     */
+    private static function processSHA3Block32(&$s)
+    {
+        static $rotationOffsets = [
+            [ 0,  1, 62, 28, 27],
+            [36, 44,  6, 55, 20],
+            [ 3, 10, 43, 25, 39],
+            [41, 45, 15, 21,  8],
+            [18,  2, 61, 56, 14]
+        ];
+
+        // the standards give these constants in hexadecimal notation. it's tempting to want to use
+        // that same notation, here, however, we can't, because 0x80000000, on PHP32, is a positive
+        // float - not the negative int that we need to be in PHP32. so we use -2147483648 instead
+        static $roundConstants = [
+            [0, 1],
+            [0, 32898],
+            [-2147483648, 32906],
+            [-2147483648, -2147450880],
+            [0, 32907],
+            [0, -2147483647],
+            [-2147483648, -2147450751],
+            [-2147483648, 32777],
+            [0, 138],
+            [0, 136],
+            [0, -2147450871],
+            [0, -2147483638],
+            [0, -2147450741],
+            [-2147483648, 139],
+            [-2147483648, 32905],
+            [-2147483648, 32771],
+            [-2147483648, 32770],
+            [-2147483648, 128],
+            [0, 32778],
+            [-2147483648, -2147483638],
+            [-2147483648, -2147450751],
+            [-2147483648, 32896],
+            [0, -2147483647],
+            [-2147483648, -2147450872]
+        ];
+
+        for ($round = 0; $round < 24; $round++) {
+            // theta step
+            $parity = $rotated = [];
+            for ($i = 0; $i < 5; $i++) {
+                $parity[] = [
+                    $s[0][$i][0] ^ $s[1][$i][0] ^ $s[2][$i][0] ^ $s[3][$i][0] ^ $s[4][$i][0],
+                    $s[0][$i][1] ^ $s[1][$i][1] ^ $s[2][$i][1] ^ $s[3][$i][1] ^ $s[4][$i][1]
+                ];
+                $rotated[] = static::rotateLeft32($parity[$i], 1);
+            }
+
+            $temp = [
+                [$parity[4][0] ^ $rotated[1][0], $parity[4][1] ^ $rotated[1][1]],
+                [$parity[0][0] ^ $rotated[2][0], $parity[0][1] ^ $rotated[2][1]],
+                [$parity[1][0] ^ $rotated[3][0], $parity[1][1] ^ $rotated[3][1]],
+                [$parity[2][0] ^ $rotated[4][0], $parity[2][1] ^ $rotated[4][1]],
+                [$parity[3][0] ^ $rotated[0][0], $parity[3][1] ^ $rotated[0][1]]
+            ];
+            for ($i = 0; $i < 5; $i++) {
+                for ($j = 0; $j < 5; $j++) {
+                    $s[$i][$j][0] ^= $temp[$j][0];
+                    $s[$i][$j][1] ^= $temp[$j][1];
+                }
+            }
+
+            $st = $s;
+
+            // rho and pi steps
+            for ($i = 0; $i < 5; $i++) {
+                for ($j = 0; $j < 5; $j++) {
+                    $st[(2 * $i + 3 * $j) % 5][$j] = static::rotateLeft32($s[$j][$i], $rotationOffsets[$j][$i]);
+                }
+            }
+
+            // chi step
+            for ($i = 0; $i < 5; $i++) {
+                $s[$i][0] = [
+                    $st[$i][0][0] ^ (~$st[$i][1][0] & $st[$i][2][0]),
+                    $st[$i][0][1] ^ (~$st[$i][1][1] & $st[$i][2][1])
+                ];
+                $s[$i][1] = [
+                    $st[$i][1][0] ^ (~$st[$i][2][0] & $st[$i][3][0]),
+                    $st[$i][1][1] ^ (~$st[$i][2][1] & $st[$i][3][1])
+                ];
+                $s[$i][2] = [
+                    $st[$i][2][0] ^ (~$st[$i][3][0] & $st[$i][4][0]),
+                    $st[$i][2][1] ^ (~$st[$i][3][1] & $st[$i][4][1])
+                ];
+                $s[$i][3] = [
+                    $st[$i][3][0] ^ (~$st[$i][4][0] & $st[$i][0][0]),
+                    $st[$i][3][1] ^ (~$st[$i][4][1] & $st[$i][0][1])
+                ];
+                $s[$i][4] = [
+                    $st[$i][4][0] ^ (~$st[$i][0][0] & $st[$i][1][0]),
+                    $st[$i][4][1] ^ (~$st[$i][0][1] & $st[$i][1][1])
+                ];
+            }
+
+            // iota step
+            $s[0][0][0] ^= $roundConstants[$round][0];
+            $s[0][0][1] ^= $roundConstants[$round][1];
+        }
+    }
+
+    /**
+     * Rotate 32-bit int
+     *
+     * @param array $x
+     * @param int $shift
+     */
+    private static function rotateLeft32($x, $shift)
+    {
+        if ($shift < 32) {
+            list($hi, $lo) = $x;
+        } else {
+            $shift -= 32;
+            list($lo, $hi) = $x;
+        }
+
+        $mask = -1 ^ (-1 << $shift);
+        return [
+            ($hi << $shift) | (($lo >> (32 - $shift)) & $mask),
+            ($lo << $shift) | (($hi >> (32 - $shift)) & $mask)
+        ];
+    }
+
+    /**
+     * Pure-PHP 64-bit implementation of SHA3
+     *
+     * @param string $p
+     * @param int $c
+     * @param int $r
+     * @param int $d
+     * @param int $padType
+     */
+    private static function sha3_64($p, $c, $r, $d, $padType)
+    {
+        $block_size = $r >> 3;
+        $padLength = $block_size - (strlen($p) % $block_size);
+        $num_ints = $block_size >> 2;
+
+        $p .= static::sha3_pad($padLength, $padType);
+
+        $n = strlen($p) / $r; // number of blocks
+
+        $s = [
+            [0, 0, 0, 0, 0],
+            [0, 0, 0, 0, 0],
+            [0, 0, 0, 0, 0],
+            [0, 0, 0, 0, 0],
+            [0, 0, 0, 0, 0]
+        ];
+
+        $p = str_split($p, $block_size);
+
+        foreach ($p as $pi) {
+            $pi = unpack('P*', $pi);
+            $x = $y = 0;
+            foreach ($pi as $subpi) {
+                $s[$x][$y++] ^= $subpi;
+                if ($y == 5) {
+                    $y = 0;
+                    $x++;
+                }
+            }
+            static::processSHA3Block64($s);
+        }
+
+        $z = '';
+        $i = $j = 0;
+        while (strlen($z) < $d) {
+            $z .= pack('P', $s[$i][$j++]);
+            if ($j == 5) {
+                $j = 0;
+                $i++;
+                if ($i == 5) {
+                    $i = 0;
+                    static::processSHA3Block64($s);
+                }
+            }
+        }
+
+        return $z;
+    }
+
+    /**
+     * 64-bit block processing method for SHA3
+     *
+     * @param array $s
+     */
+    private static function processSHA3Block64(&$s)
+    {
+        static $rotationOffsets = [
+            [ 0,  1, 62, 28, 27],
+            [36, 44,  6, 55, 20],
+            [ 3, 10, 43, 25, 39],
+            [41, 45, 15, 21,  8],
+            [18,  2, 61, 56, 14]
+        ];
+
+        static $roundConstants = [
+            1,
+            32898,
+            -9223372036854742902,
+            -9223372034707259392,
+            32907,
+            2147483649,
+            -9223372034707259263,
+            -9223372036854743031,
+            138,
+            136,
+            2147516425,
+            2147483658,
+            2147516555,
+            -9223372036854775669,
+            -9223372036854742903,
+            -9223372036854743037,
+            -9223372036854743038,
+            -9223372036854775680,
+            32778,
+            -9223372034707292150,
+            -9223372034707259263,
+            -9223372036854742912,
+            2147483649,
+            -9223372034707259384
+        ];
+
+        for ($round = 0; $round < 24; $round++) {
+            // theta step
+            $parity = [];
+            for ($i = 0; $i < 5; $i++) {
+                $parity[] = $s[0][$i] ^ $s[1][$i] ^ $s[2][$i] ^ $s[3][$i] ^ $s[4][$i];
+            }
+            $temp = [
+                $parity[4] ^ static::rotateLeft64($parity[1], 1),
+                $parity[0] ^ static::rotateLeft64($parity[2], 1),
+                $parity[1] ^ static::rotateLeft64($parity[3], 1),
+                $parity[2] ^ static::rotateLeft64($parity[4], 1),
+                $parity[3] ^ static::rotateLeft64($parity[0], 1)
+            ];
+            for ($i = 0; $i < 5; $i++) {
+                for ($j = 0; $j < 5; $j++) {
+                    $s[$i][$j] ^= $temp[$j];
+                }
+            }
+
+            $st = $s;
+
+            // rho and pi steps
+            for ($i = 0; $i < 5; $i++) {
+                for ($j = 0; $j < 5; $j++) {
+                    $st[(2 * $i + 3 * $j) % 5][$j] = static::rotateLeft64($s[$j][$i], $rotationOffsets[$j][$i]);
+                }
+            }
+
+            // chi step
+            for ($i = 0; $i < 5; $i++) {
+                $s[$i] = [
+                    $st[$i][0] ^ (~$st[$i][1] & $st[$i][2]),
+                    $st[$i][1] ^ (~$st[$i][2] & $st[$i][3]),
+                    $st[$i][2] ^ (~$st[$i][3] & $st[$i][4]),
+                    $st[$i][3] ^ (~$st[$i][4] & $st[$i][0]),
+                    $st[$i][4] ^ (~$st[$i][0] & $st[$i][1])
+                ];
+            }
+
+            // iota step
+            $s[0][0] ^= $roundConstants[$round];
+        }
+    }
+
+    /**
+     * Left rotate 64-bit int
+     *
+     * @param int $x
+     * @param int $shift
+     */
+    private static function rotateLeft64($x, $shift)
+    {
+        $mask = -1 ^ (-1 << $shift);
+        return ($x << $shift) | (($x >> (64 - $shift)) & $mask);
+    }
+
+    /**
+     * Right rotate 64-bit int
+     *
+     * @param int $x
+     * @param int $shift
+     */
+    private static function rotateRight64($x, $shift)
+    {
+        $mask = -1 ^ (-1 << (64 - $shift));
+        return (($x >> $shift) & $mask) | ($x << (64 - $shift));
+    }
+
+    /**
+     * Pure-PHP implementation of SHA512
+     *
+     * @param string $m
+     * @param array $hash
+     * @return string
+     */
+    private static function sha512($m, $hash)
+    {
+        static $k;
+
+        if (!isset($k)) {
+            // Initialize table of round constants
+            // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
+            $k = [
+                '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
+                '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
+                'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
+                '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
+                'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
+                '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
+                '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
+                'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
+                '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
+                '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
+                'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
+                'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
+                '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
+                '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
+                '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
+                '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
+                'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
+                '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
+                '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
+                '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
+            ];
+
+            for ($i = 0; $i < 80; $i++) {
+                $k[$i] = new BigInteger($k[$i], 16);
+            }
+        }
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
+        $m .= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m .= pack('N4', 0, 0, 0, $length << 3);
+
+        // Process the message in successive 1024-bit chunks
+        $chunks = str_split($m, 128);
+        foreach ($chunks as $chunk) {
+            $w = [];
+            for ($i = 0; $i < 16; $i++) {
+                $temp = new BigInteger(Strings::shift($chunk, 8), 256);
+                $temp->setPrecision(64);
+                $w[] = $temp;
+            }
+
+            // Extend the sixteen 32-bit words into eighty 32-bit words
+            for ($i = 16; $i < 80; $i++) {
+                $temp = [
+                          $w[$i - 15]->bitwise_rightRotate(1),
+                          $w[$i - 15]->bitwise_rightRotate(8),
+                          $w[$i - 15]->bitwise_rightShift(7)
+                ];
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = [
+                          $w[$i - 2]->bitwise_rightRotate(19),
+                          $w[$i - 2]->bitwise_rightRotate(61),
+                          $w[$i - 2]->bitwise_rightShift(6)
+                ];
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $w[$i] = clone $w[$i - 16];
+                $w[$i] = $w[$i]->add($s0);
+                $w[$i] = $w[$i]->add($w[$i - 7]);
+                $w[$i] = $w[$i]->add($s1);
+            }
+
+            // Initialize hash value for this chunk
+            $a = clone $hash[0];
+            $b = clone $hash[1];
+            $c = clone $hash[2];
+            $d = clone $hash[3];
+            $e = clone $hash[4];
+            $f = clone $hash[5];
+            $g = clone $hash[6];
+            $h = clone $hash[7];
+
+            // Main loop
+            for ($i = 0; $i < 80; $i++) {
+                $temp = [
+                    $a->bitwise_rightRotate(28),
+                    $a->bitwise_rightRotate(34),
+                    $a->bitwise_rightRotate(39)
+                ];
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = [
+                    $a->bitwise_and($b),
+                    $a->bitwise_and($c),
+                    $b->bitwise_and($c)
+                ];
+                $maj = $temp[0]->bitwise_xor($temp[1]);
+                $maj = $maj->bitwise_xor($temp[2]);
+                $t2 = $s0->add($maj);
+
+                $temp = [
+                    $e->bitwise_rightRotate(14),
+                    $e->bitwise_rightRotate(18),
+                    $e->bitwise_rightRotate(41)
+                ];
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $temp = [
+                    $e->bitwise_and($f),
+                    $g->bitwise_and($e->bitwise_not())
+                ];
+                $ch = $temp[0]->bitwise_xor($temp[1]);
+                $t1 = $h->add($s1);
+                $t1 = $t1->add($ch);
+                $t1 = $t1->add($k[$i]);
+                $t1 = $t1->add($w[$i]);
+
+                $h = clone $g;
+                $g = clone $f;
+                $f = clone $e;
+                $e = $d->add($t1);
+                $d = clone $c;
+                $c = clone $b;
+                $b = clone $a;
+                $a = $t1->add($t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = [
+                $hash[0]->add($a),
+                $hash[1]->add($b),
+                $hash[2]->add($c),
+                $hash[3]->add($d),
+                $hash[4]->add($e),
+                $hash[5]->add($f),
+                $hash[6]->add($g),
+                $hash[7]->add($h)
+            ];
+        }
+
+        // Produce the final hash value (big-endian)
+        // (\phpseclib3\Crypt\Hash::hash() trims the output for hashes but not for HMACs.  as such, we trim the output here)
+        $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
+                $hash[4]->toBytes() . $hash[5]->toBytes() . $hash[6]->toBytes() . $hash[7]->toBytes();
+
+        return $temp;
+    }
+
+    /**
+     * Pure-PHP implementation of SHA512
+     *
+     * @param string $m
+     * @param array $hash
+     * @return string
+     */
+    private static function sha512_64($m, $hash)
+    {
+        static $k;
+
+        if (!isset($k)) {
+            // Initialize table of round constants
+            // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
+            $k = [
+                '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
+                '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
+                'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
+                '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
+                'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
+                '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
+                '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
+                'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
+                '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
+                '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
+                'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
+                'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
+                '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
+                '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
+                '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
+                '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
+                'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
+                '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
+                '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
+                '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
+            ];
+
+            for ($i = 0; $i < 80; $i++) {
+                list(, $k[$i]) = unpack('J', pack('H*', $k[$i]));
+            }
+        }
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
+        $m .= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m .= pack('N4', 0, 0, 0, $length << 3);
+
+        // Process the message in successive 1024-bit chunks
+        $chunks = str_split($m, 128);
+        foreach ($chunks as $chunk) {
+            $w = [];
+            for ($i = 0; $i < 16; $i++) {
+                list(, $w[]) = unpack('J', Strings::shift($chunk, 8));
+            }
+
+            // Extend the sixteen 32-bit words into eighty 32-bit words
+            for ($i = 16; $i < 80; $i++) {
+                $temp = [
+                    self::rotateRight64($w[$i - 15], 1),
+                    self::rotateRight64($w[$i - 15], 8),
+                    ($w[$i - 15] >> 7) & 0x01FFFFFFFFFFFFFF,
+                ];
+                $s0 = $temp[0] ^ $temp[1] ^ $temp[2];
+                $temp = [
+                    self::rotateRight64($w[$i - 2], 19),
+                    self::rotateRight64($w[$i - 2], 61),
+                    ($w[$i - 2] >> 6) & 0x03FFFFFFFFFFFFFF,
+                ];
+                $s1 = $temp[0] ^ $temp[1] ^ $temp[2];
+
+                $w[$i] = $w[$i - 16];
+                $w[$i] = self::add64($w[$i], $s0);
+                $w[$i] = self::add64($w[$i], $w[$i - 7]);
+                $w[$i] = self::add64($w[$i], $s1);
+            }
+
+            // Initialize hash value for this chunk
+            list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
+
+            // Main loop
+            for ($i = 0; $i < 80; $i++) {
+                $temp = [
+                    self::rotateRight64($a, 28),
+                    self::rotateRight64($a, 34),
+                    self::rotateRight64($a, 39),
+                ];
+                $s0 = $temp[0] ^ $temp[1] ^ $temp[2];
+                $temp = [$a & $b, $a & $c, $b & $c];
+                $maj = $temp[0] ^ $temp[1] ^ $temp[2];
+                $t2 = self::add64($s0, $maj);
+
+                $temp = [
+                    self::rotateRight64($e, 14),
+                    self::rotateRight64($e, 18),
+                    self::rotateRight64($e, 41),
+                ];
+                $s1 = $temp[0] ^ $temp[1] ^ $temp[2];
+                $ch = ($e & $f) ^ ($g & ~$e);
+                $t1 = self::add64($h, $s1);
+                $t1 = self::add64($t1, $ch);
+                $t1 = self::add64($t1, $k[$i]);
+                $t1 = self::add64($t1, $w[$i]);
+
+                $h = $g;
+                $g = $f;
+                $f = $e;
+                $e = self::add64($d, $t1);
+                $d = $c;
+                $c = $b;
+                $b = $a;
+                $a = self::add64($t1, $t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = [
+                self::add64($hash[0], $a),
+                self::add64($hash[1], $b),
+                self::add64($hash[2], $c),
+                self::add64($hash[3], $d),
+                self::add64($hash[4], $e),
+                self::add64($hash[5], $f),
+                self::add64($hash[6], $g),
+                self::add64($hash[7], $h),
+            ];
+        }
+
+        // Produce the final hash value (big-endian)
+        // (\phpseclib3\Crypt\Hash::hash() trims the output for hashes but not for HMACs.  as such, we trim the output here)
+        return pack('J*', ...$hash);
+    }
+
+    /**
+     *  __toString() magic method
+     */
+    public function __toString()
+    {
+        return $this->getHash();
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/PublicKeyLoader.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/PublicKeyLoader.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/PublicKeyLoader.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * PublicKeyLoader
+ *
+ * Returns a PublicKey or PrivateKey object.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\Common\PrivateKey;
+use phpseclib3\Crypt\Common\PublicKey;
+use phpseclib3\Exception\NoKeyLoadedException;
+use phpseclib3\File\X509;
+
+/**
+ * PublicKeyLoader
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PublicKeyLoader
+{
+    /**
+     * Loads a public or private key
+     *
+     * @return AsymmetricKey
+     * @param string|array $key
+     * @param string $password optional
+     */
+    public static function load($key, $password = false)
+    {
+        try {
+            return EC::load($key, $password);
+        } catch (NoKeyLoadedException $e) {
+        }
+
+        try {
+            return RSA::load($key, $password);
+        } catch (NoKeyLoadedException $e) {
+        }
+
+        try {
+            return DSA::load($key, $password);
+        } catch (NoKeyLoadedException $e) {
+        }
+
+        try {
+            $x509 = new X509();
+            $x509->loadX509($key);
+            $key = $x509->getPublicKey();
+            if ($key) {
+                return $key;
+            }
+        } catch (\Exception $e) {
+        }
+
+        throw new NoKeyLoadedException('Unable to read key');
+    }
+
+    /**
+     * Loads a private key
+     *
+     * @return PrivateKey
+     * @param string|array $key
+     * @param string $password optional
+     */
+    public static function loadPrivateKey($key, $password = false)
+    {
+        $key = self::load($key, $password);
+        if (!$key instanceof PrivateKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a private key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads a public key
+     *
+     * @return PublicKey
+     * @param string|array $key
+     */
+    public static function loadPublicKey($key)
+    {
+        $key = self::load($key);
+        if (!$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a public key');
+        }
+        return $key;
+    }
+
+    /**
+     * Loads parameters
+     *
+     * @return AsymmetricKey
+     * @param string|array $key
+     */
+    public static function loadParameters($key)
+    {
+        $key = self::load($key);
+        if (!$key instanceof PrivateKey && !$key instanceof PublicKey) {
+            throw new NoKeyLoadedException('The key that was loaded was not a parameter');
+        }
+        return $key;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RC2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,640 @@
+<?php
+
+/**
+ * Pure-PHP implementation of RC2.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://tools.ietf.org/html/rfc2268}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $rc2 = new \phpseclib3\Crypt\RC2('ctr');
+ *
+ *    $rc2->setKey('abcdefgh');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $rc2->decrypt($rc2->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author   Patrick Monnerat <pm@datasphere.ch>
+ * @license  http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link     http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\BlockCipher;
+use phpseclib3\Exception\BadModeException;
+
+/**
+ * Pure-PHP implementation of RC2.
+ *
+ */
+class RC2 extends BlockCipher
+{
+    /**
+     * Block Length of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
+     * @var int
+     */
+    protected $block_size = 8;
+
+    /**
+     * The Key
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::key
+     * @see self::setKey()
+     * @var string
+     */
+    protected $key;
+
+    /**
+     * The Original (unpadded) Key
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::key
+     * @see self::setKey()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @var string
+     */
+    private $orig_key;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see \phpseclib3\Crypt\RC2::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 16; // = 128 bits
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'rc2';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len
+     * @var int
+     */
+    protected $cfb_init_len = 500;
+
+    /**
+     * The key length in bits.
+     *
+     * {@internal Should be in range [1..1024].}
+     *
+     * {@internal Changing this value after setting the key has no effect.}
+     *
+     * @see self::setKeyLength()
+     * @see self::setKey()
+     * @var int
+     */
+    private $default_key_length = 1024;
+
+    /**
+     * The key length in bits.
+     *
+     * {@internal Should be in range [1..1024].}
+     *
+     * @see self::isValidEnine()
+     * @see self::setKey()
+     * @var int
+     */
+    private $current_key_length;
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::setupKey()
+     * @var array
+     */
+    private $keys;
+
+    /**
+     * Key expansion randomization table.
+     * Twice the same 256-value sequence to save a modulus in key expansion.
+     *
+     * @see self::setKey()
+     * @var array
+     */
+    private static $pitable = [
+        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
+        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
+        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
+        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
+        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
+        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
+        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
+        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
+        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
+        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
+        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
+        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
+        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
+        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
+        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
+        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
+        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
+        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
+        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
+        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
+        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
+        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
+        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
+        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
+        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
+        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
+        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
+        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
+        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
+        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
+        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
+        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD,
+        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
+        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
+        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
+        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
+        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
+        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
+        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
+        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
+        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
+        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
+        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
+        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
+        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
+        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
+        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
+        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
+        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
+        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
+        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
+        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
+        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
+        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
+        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
+        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
+        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
+        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
+        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
+        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
+        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
+        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
+        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
+        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD
+    ];
+
+    /**
+     * Inverse key expansion randomization table.
+     *
+     * @see self::setKey()
+     * @var array
+     */
+    private static $invpitable = [
+        0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66,
+        0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4,
+        0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20,
+        0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53,
+        0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68,
+        0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B,
+        0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12,
+        0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB,
+        0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3,
+        0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26,
+        0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67,
+        0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB,
+        0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC,
+        0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60,
+        0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7,
+        0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD,
+        0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24,
+        0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31,
+        0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE,
+        0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99,
+        0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C,
+        0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA,
+        0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35,
+        0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61,
+        0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72,
+        0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3,
+        0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F,
+        0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9,
+        0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77,
+        0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75,
+        0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87,
+        0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6
+    ];
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $mode
+     * @throws \InvalidArgumentException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        parent::__construct($mode);
+
+        if ($this->mode == self::MODE_STREAM) {
+            throw new BadModeException('Block ciphers cannot be ran in stream mode');
+        }
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        switch ($engine) {
+            case self::ENGINE_OPENSSL:
+                if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) {
+                    return false;
+                }
+                // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
+                // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
+                // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
+                if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                    return false;
+                }
+                $this->cipher_name_openssl_ecb = 'rc2-ecb';
+                $this->cipher_name_openssl = 'rc2-' . $this->openssl_translate_mode();
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 8 to 1024.
+     * Calling this function after setting the key has no effect until the next
+     *  \phpseclib3\Crypt\RC2::setKey() call.
+     *
+     * @param int $length in bits
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKeyLength($length)
+    {
+        if ($length < 8 || $length > 1024) {
+            throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 1024 bits, inclusive, are supported');
+        }
+
+        $this->default_key_length = $this->current_key_length = $length;
+        $this->explicit_key_length = $length >> 3;
+    }
+
+    /**
+     * Returns the current key length
+     *
+     * @return int
+     */
+    public function getKeyLength()
+    {
+        return $this->current_key_length;
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg.
+     * strlen($key) <= 128), however, we only use the first 128 bytes if $key
+     * has more then 128 bytes in it, and set $key to a single null byte if
+     * it is empty.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setKey()
+     * @param string $key
+     * @param int|boolean $t1 optional Effective key length in bits.
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKey($key, $t1 = false)
+    {
+        $this->orig_key = $key;
+
+        if ($t1 === false) {
+            $t1 = $this->default_key_length;
+        }
+
+        if ($t1 < 1 || $t1 > 1024) {
+            throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 1024 bits, inclusive, are supported');
+        }
+
+        $this->current_key_length = $t1;
+        if (strlen($key) < 1 || strlen($key) > 128) {
+            throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes between 8 and 1024 bits, inclusive, are supported');
+        }
+
+        $t = strlen($key);
+
+        // The mcrypt RC2 implementation only supports effective key length
+        // of 1024 bits. It is however possible to handle effective key
+        // lengths in range 1..1024 by expanding the key and applying
+        // inverse pitable mapping to the first byte before submitting it
+        // to mcrypt.
+
+        // Key expansion.
+        $l = array_values(unpack('C*', $key));
+        $t8 = ($t1 + 7) >> 3;
+        $tm = 0xFF >> (8 * $t8 - $t1);
+
+        // Expand key.
+        $pitable = self::$pitable;
+        for ($i = $t; $i < 128; $i++) {
+            $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]];
+        }
+        $i = 128 - $t8;
+        $l[$i] = $pitable[$l[$i] & $tm];
+        while ($i--) {
+            $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]];
+        }
+
+        // Prepare the key for mcrypt.
+        $l[0] = self::$invpitable[$l[0]];
+        array_unshift($l, 'C*');
+
+        $this->key = pack(...$l);
+        $this->key_length = strlen($this->key);
+        $this->changed = $this->nonIVChanged = true;
+        $this->setEngine();
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * Mostly a wrapper for \phpseclib3\Crypt\Common\SymmetricKey::encrypt, with some additional OpenSSL handling code
+     *
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    public function encrypt($plaintext)
+    {
+        if ($this->engine == self::ENGINE_OPENSSL) {
+            $temp = $this->key;
+            $this->key = $this->orig_key;
+            $result = parent::encrypt($plaintext);
+            $this->key = $temp;
+            return $result;
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * Mostly a wrapper for \phpseclib3\Crypt\Common\SymmetricKey::decrypt, with some additional OpenSSL handling code
+     *
+     * @see self::encrypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    public function decrypt($ciphertext)
+    {
+        if ($this->engine == self::ENGINE_OPENSSL) {
+            $temp = $this->key;
+            $this->key = $this->orig_key;
+            $result = parent::decrypt($ciphertext);
+            $this->key = $temp;
+            return $result;
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encryptBlock()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @param string $in
+     * @return string
+     */
+    protected function encryptBlock($in)
+    {
+        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
+        $keys = $this->keys;
+        $limit = 20;
+        $actions = [$limit => 44, 44 => 64];
+        $j = 0;
+
+        for (;;) {
+            // Mixing round.
+            $r0 = (($r0 + $keys[$j++] + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
+            $r0 |= $r0 >> 16;
+            $r1 = (($r1 + $keys[$j++] + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
+            $r1 |= $r1 >> 16;
+            $r2 = (($r2 + $keys[$j++] + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
+            $r2 |= $r2 >> 16;
+            $r3 = (($r3 + $keys[$j++] + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
+            $r3 |= $r3 >> 16;
+
+            if ($j === $limit) {
+                if ($limit === 64) {
+                    break;
+                }
+
+                // Mashing round.
+                $r0 += $keys[$r3 & 0x3F];
+                $r1 += $keys[$r0 & 0x3F];
+                $r2 += $keys[$r1 & 0x3F];
+                $r3 += $keys[$r2 & 0x3F];
+                $limit = $actions[$limit];
+            }
+        }
+
+        return pack('vvvv', $r0, $r1, $r2, $r3);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decryptBlock()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @param string $in
+     * @return string
+     */
+    protected function decryptBlock($in)
+    {
+        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
+        $keys = $this->keys;
+        $limit = 44;
+        $actions = [$limit => 20, 20 => 0];
+        $j = 64;
+
+        for (;;) {
+            // R-mixing round.
+            $r3 = ($r3 | ($r3 << 16)) >> 5;
+            $r3 = ($r3 - $keys[--$j] - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
+            $r2 = ($r2 | ($r2 << 16)) >> 3;
+            $r2 = ($r2 - $keys[--$j] - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
+            $r1 = ($r1 | ($r1 << 16)) >> 2;
+            $r1 = ($r1 - $keys[--$j] - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
+            $r0 = ($r0 | ($r0 << 16)) >> 1;
+            $r0 = ($r0 - $keys[--$j] - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;
+
+            if ($j === $limit) {
+                if ($limit === 0) {
+                    break;
+                }
+
+                // R-mashing round.
+                $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
+                $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
+                $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
+                $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;
+                $limit = $actions[$limit];
+            }
+        }
+
+        return pack('vvvv', $r0, $r1, $r2, $r3);
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey()
+     */
+    protected function setupKey()
+    {
+        if (!isset($this->key)) {
+            $this->setKey('');
+        }
+
+        // Key has already been expanded in \phpseclib3\Crypt\RC2::setKey():
+        // Only the first value must be altered.
+        $l = unpack('Ca/Cb/v*', $this->key);
+        array_unshift($l, self::$pitable[$l['a']] | ($l['b'] << 8));
+        unset($l['a']);
+        unset($l['b']);
+        $this->keys = $l;
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupInlineCrypt()
+     */
+    protected function setupInlineCrypt()
+    {
+        // Init code for both, encrypt and decrypt.
+        $init_crypt = '$keys = $this->keys;';
+
+        $keys = $this->keys;
+
+        // $in is the current 8 bytes block which has to be en/decrypt
+        $encrypt_block = $decrypt_block = '
+            $in = unpack("v4", $in);
+            $r0 = $in[1];
+            $r1 = $in[2];
+            $r2 = $in[3];
+            $r3 = $in[4];
+        ';
+
+        // Create code for encryption.
+        $limit = 20;
+        $actions = [$limit => 44, 44 => 64];
+        $j = 0;
+
+        for (;;) {
+            // Mixing round.
+            $encrypt_block .= '
+                $r0 = (($r0 + ' . $keys[$j++] . ' +
+                       ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
+                $r0 |= $r0 >> 16;
+                $r1 = (($r1 + ' . $keys[$j++] . ' +
+                       ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
+                $r1 |= $r1 >> 16;
+                $r2 = (($r2 + ' . $keys[$j++] . ' +
+                       ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
+                $r2 |= $r2 >> 16;
+                $r3 = (($r3 + ' . $keys[$j++] . ' +
+                       ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
+                $r3 |= $r3 >> 16;';
+
+            if ($j === $limit) {
+                if ($limit === 64) {
+                    break;
+                }
+
+                // Mashing round.
+                $encrypt_block .= '
+                    $r0 += $keys[$r3 & 0x3F];
+                    $r1 += $keys[$r0 & 0x3F];
+                    $r2 += $keys[$r1 & 0x3F];
+                    $r3 += $keys[$r2 & 0x3F];';
+                $limit = $actions[$limit];
+            }
+        }
+
+        $encrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';
+
+        // Create code for decryption.
+        $limit = 44;
+        $actions = [$limit => 20, 20 => 0];
+        $j = 64;
+
+        for (;;) {
+            // R-mixing round.
+            $decrypt_block .= '
+                $r3 = ($r3 | ($r3 << 16)) >> 5;
+                $r3 = ($r3 - ' . $keys[--$j] . ' -
+                       ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
+                $r2 = ($r2 | ($r2 << 16)) >> 3;
+                $r2 = ($r2 - ' . $keys[--$j] . ' -
+                       ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
+                $r1 = ($r1 | ($r1 << 16)) >> 2;
+                $r1 = ($r1 - ' . $keys[--$j] . ' -
+                       ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
+                $r0 = ($r0 | ($r0 << 16)) >> 1;
+                $r0 = ($r0 - ' . $keys[--$j] . ' -
+                       ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;';
+
+            if ($j === $limit) {
+                if ($limit === 0) {
+                    break;
+                }
+
+                // R-mashing round.
+                $decrypt_block .= '
+                    $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
+                    $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
+                    $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
+                    $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;';
+                $limit = $actions[$limit];
+            }
+        }
+
+        $decrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';
+
+        // Creates the inline-crypt function
+        $this->inline_crypt = $this->createInlineCryptFunction(
+            [
+               'init_crypt'    => $init_crypt,
+               'encrypt_block' => $encrypt_block,
+               'decrypt_block' => $decrypt_block
+            ]
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RC4.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RC4.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RC4.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,280 @@
+<?php
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt ARCFOUR Algorithm}
+ *  - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
+ *
+ * RC4 is also known as ARCFOUR or ARC4.  The reason is elaborated upon at Wikipedia.  This class is named RC4 and not
+ * ARCFOUR or ARC4 because RC4 is how it is referred to in the SSH1 specification.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $rc4 = new \phpseclib3\Crypt\RC4();
+ *
+ *    $rc4->setKey('abcdefgh');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rc4->decrypt($rc4->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\StreamCipher;
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class RC4 extends StreamCipher
+{
+    /**
+     * @see \phpseclib3\Crypt\RC4::_crypt()
+     */
+    const ENCRYPT = 0;
+
+    /**
+     * @see \phpseclib3\Crypt\RC4::_crypt()
+     */
+    const DECRYPT = 1;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see \phpseclib3\Crypt\RC4::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 128; // = 1024 bits
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'arcfour';
+
+    /**
+     * The Key
+     *
+     * @see self::setKey()
+     * @var string
+     */
+    protected $key;
+
+    /**
+     * The Key Stream for decryption and encryption
+     *
+     * @see self::setKey()
+     * @var array
+     */
+    private $stream;
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        if ($engine == self::ENGINE_OPENSSL) {
+            if ($this->continuousBuffer) {
+                return false;
+            }
+            // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
+            // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
+            // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
+            if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                return false;
+            }
+            $this->cipher_name_openssl = 'rc4-40';
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Keys can be between 1 and 256 bytes long.
+     *
+     * @param int $length
+     * @throws \LengthException if the key length is invalid
+     */
+    public function setKeyLength($length)
+    {
+        if ($length < 8 || $length > 2048) {
+            throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 256 bytes are supported');
+        }
+
+        $this->key_length = $length >> 3;
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Keys can be between 1 and 256 bytes long.
+     *
+     * @param string $key
+     */
+    public function setKey($key)
+    {
+        $length = strlen($key);
+        if ($length < 1 || $length > 256) {
+            throw new \LengthException('Key size of ' . $length . ' bytes is not supported by RC4. Keys must be between 1 and 256 bytes long');
+        }
+
+        parent::setKey($key);
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @see self::crypt()
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    public function encrypt($plaintext)
+    {
+        if ($this->engine != self::ENGINE_INTERNAL) {
+            return parent::encrypt($plaintext);
+        }
+        return $this->crypt($plaintext, self::ENCRYPT);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
+     * At least if the continuous buffer is disabled.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see self::crypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    public function decrypt($ciphertext)
+    {
+        if ($this->engine != self::ENGINE_INTERNAL) {
+            return parent::decrypt($ciphertext);
+        }
+        return $this->crypt($ciphertext, self::DECRYPT);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @param string $in
+     */
+    protected function encryptBlock($in)
+    {
+        // RC4 does not utilize this method
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @param string $in
+     */
+    protected function decryptBlock($in)
+    {
+        // RC4 does not utilize this method
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::_setupKey()
+     */
+    protected function setupKey()
+    {
+        $key = $this->key;
+        $keyLength = strlen($key);
+        $keyStream = range(0, 255);
+        $j = 0;
+        for ($i = 0; $i < 256; $i++) {
+            $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
+            $temp = $keyStream[$i];
+            $keyStream[$i] = $keyStream[$j];
+            $keyStream[$j] = $temp;
+        }
+
+        $this->stream = [];
+        $this->stream[self::DECRYPT] = $this->stream[self::ENCRYPT] = [
+            0, // index $i
+            0, // index $j
+            $keyStream
+        ];
+    }
+
+    /**
+     * Encrypts or decrypts a message.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $text
+     * @param int $mode
+     * @return string $text
+     */
+    private function crypt($text, $mode)
+    {
+        if ($this->changed) {
+            $this->setup();
+        }
+
+        $stream = &$this->stream[$mode];
+        if ($this->continuousBuffer) {
+            $i = &$stream[0];
+            $j = &$stream[1];
+            $keyStream = &$stream[2];
+        } else {
+            $i = $stream[0];
+            $j = $stream[1];
+            $keyStream = $stream[2];
+        }
+
+        $len = strlen($text);
+        for ($k = 0; $k < $len; ++$k) {
+            $i = ($i + 1) & 255;
+            $ksi = $keyStream[$i];
+            $j = ($j + $ksi) & 255;
+            $ksj = $keyStream[$j];
+
+            $keyStream[$i] = $ksj;
+            $keyStream[$j] = $ksi;
+            $text[$k] = $text[$k] ^ chr($keyStream[($ksj + $ksi) & 255]);
+        }
+
+        return $text;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,934 @@
+<?php
+
+/**
+ * Pure-PHP PKCS#1 (v2.1) compliant implementation of RSA.
+ *
+ * PHP version 5
+ *
+ * Here's an example of how to encrypt and decrypt text with this library:
+ * <code>
+ * <?php
+ * include 'vendor/autoload.php';
+ *
+ * $private = Crypt\RSA::createKey();
+ * $public = $private->getPublicKey();
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $ciphertext = $public->encrypt($plaintext);
+ *
+ * echo $private->decrypt($ciphertext);
+ * ?>
+ * </code>
+ *
+ * Here's an example of how to create signatures and verify signatures with this library:
+ * <code>
+ * <?php
+ * include 'vendor/autoload.php';
+ *
+ * $private = Crypt\RSA::createKey();
+ * $public = $private->getPublicKey();
+ *
+ * $plaintext = 'terrafrost';
+ *
+ * $signature = $private->sign($plaintext);
+ *
+ * echo $public->verify($plaintext, $signature) ? 'verified' : 'unverified';
+ * ?>
+ * </code>
+ *
+ * One thing to consider when using this: so phpseclib uses PSS mode by default.
+ * Technically, id-RSASSA-PSS has a different key format than rsaEncryption. So
+ * should phpseclib save to the id-RSASSA-PSS format by default or the
+ * rsaEncryption format? For stand-alone keys I figure rsaEncryption is better
+ * because SSH doesn't use PSS and idk how many SSH servers would be able to
+ * decode an id-RSASSA-PSS key. For X.509 certificates the id-RSASSA-PSS
+ * format is used by default (unless you change it up to use PKCS1 instead)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\RSA\Formats\Keys\PSS;
+use phpseclib3\Crypt\RSA\PrivateKey;
+use phpseclib3\Crypt\RSA\PublicKey;
+use phpseclib3\Exception\InconsistentSetupException;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP PKCS#1 compliant implementation of RSA.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RSA extends AsymmetricKey
+{
+    /**
+     * Algorithm Name
+     *
+     * @var string
+     */
+    const ALGORITHM = 'RSA';
+
+    /**
+     * Use {@link http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding Optimal Asymmetric Encryption Padding}
+     * (OAEP) for encryption / decryption.
+     *
+     * Uses sha256 by default
+     *
+     * @see self::setHash()
+     * @see self::setMGFHash()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     */
+    const ENCRYPTION_OAEP = 1;
+
+    /**
+     * Use PKCS#1 padding.
+     *
+     * Although self::PADDING_OAEP / self::PADDING_PSS  offers more security, including PKCS#1 padding is necessary for purposes of backwards
+     * compatibility with protocols (like SSH-1) written before OAEP's introduction.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     */
+    const ENCRYPTION_PKCS1 = 2;
+
+    /**
+     * Do not use any padding
+     *
+     * Although this method is not recommended it can none-the-less sometimes be useful if you're trying to decrypt some legacy
+     * stuff, if you're trying to diagnose why an encrypted message isn't decrypting, etc.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     */
+    const ENCRYPTION_NONE = 4;
+
+    /**
+     * Use the Probabilistic Signature Scheme for signing
+     *
+     * Uses sha256 and 0 as the salt length
+     *
+     * @see self::setSaltLength()
+     * @see self::setMGFHash()
+     * @see self::setHash()
+     * @see self::sign()
+     * @see self::verify()
+     * @see self::setHash()
+     */
+    const SIGNATURE_PSS = 16;
+
+    /**
+     * Use a relaxed version of PKCS#1 padding for signature verification
+     *
+     * @see self::sign()
+     * @see self::verify()
+     * @see self::setHash()
+     */
+    const SIGNATURE_RELAXED_PKCS1 = 32;
+
+    /**
+     * Use PKCS#1 padding for signature verification
+     *
+     * @see self::sign()
+     * @see self::verify()
+     * @see self::setHash()
+     */
+    const SIGNATURE_PKCS1 = 64;
+
+    /**
+     * Encryption padding mode
+     *
+     * @var int
+     */
+    protected $encryptionPadding = self::ENCRYPTION_OAEP;
+
+    /**
+     * Signature padding mode
+     *
+     * @var int
+     */
+    protected $signaturePadding = self::SIGNATURE_PSS;
+
+    /**
+     * Length of hash function output
+     *
+     * @var int
+     */
+    protected $hLen;
+
+    /**
+     * Length of salt
+     *
+     * @var int
+     */
+    protected $sLen;
+
+    /**
+     * Label
+     *
+     * @var string
+     */
+    protected $label = '';
+
+    /**
+     * Hash function for the Mask Generation Function
+     *
+     * @var Hash
+     */
+    protected $mgfHash;
+
+    /**
+     * Length of MGF hash function output
+     *
+     * @var int
+     */
+    protected $mgfHLen;
+
+    /**
+     * Modulus (ie. n)
+     *
+     * @var Math\BigInteger
+     */
+    protected $modulus;
+
+    /**
+     * Modulus length
+     *
+     * @var Math\BigInteger
+     */
+    protected $k;
+
+    /**
+     * Exponent (ie. e or d)
+     *
+     * @var Math\BigInteger
+     */
+    protected $exponent;
+
+    /**
+     * Default public exponent
+     *
+     * @var int
+     * @link http://en.wikipedia.org/wiki/65537_%28number%29
+     */
+    private static $defaultExponent = 65537;
+
+    /**
+     * Enable Blinding?
+     *
+     * @var bool
+     */
+    protected static $enableBlinding = true;
+
+    /**
+     * OpenSSL configuration file name.
+     *
+     * @see self::createKey()
+     * @var ?string
+     */
+    protected static $configFile;
+
+    /**
+     * Smallest Prime
+     *
+     * Per <http://cseweb.ucsd.edu/~hovav/dist/survey.pdf#page=5>, this number ought not result in primes smaller
+     * than 256 bits. As a consequence if the key you're trying to create is 1024 bits and you've set smallestPrime
+     * to 384 bits then you're going to get a 384 bit prime and a 640 bit prime (384 + 1024 % 384). At least if
+     * engine is set to self::ENGINE_INTERNAL. If Engine is set to self::ENGINE_OPENSSL then smallest Prime is
+     * ignored (ie. multi-prime RSA support is more intended as a way to speed up RSA key generation when there's
+     * a chance neither gmp nor OpenSSL are installed)
+     *
+     * @var int
+     */
+    private static $smallestPrime = 4096;
+
+    /**
+     * Public Exponent
+     *
+     * @var Math\BigInteger
+     */
+    protected $publicExponent;
+
+    /**
+     * Sets the public exponent for key generation
+     *
+     * This will be 65537 unless changed.
+     *
+     * @param int $val
+     */
+    public static function setExponent($val)
+    {
+        self::$defaultExponent = $val;
+    }
+
+    /**
+     * Sets the smallest prime number in bits. Used for key generation
+     *
+     * This will be 4096 unless changed.
+     *
+     * @param int $val
+     */
+    public static function setSmallestPrime($val)
+    {
+        self::$smallestPrime = $val;
+    }
+
+    /**
+     * Sets the OpenSSL config file path
+     *
+     * Set to the empty string to use the default config file
+     *
+     * @param string $val
+     */
+    public static function setOpenSSLConfigPath($val)
+    {
+        self::$configFile = $val;
+    }
+
+    /**
+     * Create a private key
+     *
+     * The public key can be extracted from the private key
+     *
+     * @return PrivateKey
+     * @param int $bits
+     */
+    public static function createKey($bits = 2048)
+    {
+        self::initialize_static_variables();
+
+        $class = new \ReflectionClass(static::class);
+        if ($class->isFinal()) {
+            throw new \RuntimeException('createKey() should not be called from final classes (' . static::class . ')');
+        }
+
+        $regSize = $bits >> 1; // divide by two to see how many bits P and Q would be
+        if ($regSize > self::$smallestPrime) {
+            $num_primes = floor($bits / self::$smallestPrime);
+            $regSize = self::$smallestPrime;
+        } else {
+            $num_primes = 2;
+        }
+
+        if ($num_primes == 2 && $bits >= 384 && self::$defaultExponent == 65537) {
+            if (!isset(self::$engines['PHP'])) {
+                self::useBestEngine();
+            }
+
+            // OpenSSL uses 65537 as the exponent and requires RSA keys be 384 bits minimum
+            if (self::$engines['OpenSSL']) {
+                $config = [];
+                if (self::$configFile) {
+                    $config['config'] = self::$configFile;
+                }
+                $rsa = openssl_pkey_new(['private_key_bits' => $bits] + $config);
+                openssl_pkey_export($rsa, $privatekeystr, null, $config);
+
+                // clear the buffer of error strings stemming from a minimalistic openssl.cnf
+                // https://github.com/php/php-src/issues/11054 talks about other errors this'll pick up
+                while (openssl_error_string() !== false) {
+                }
+
+                return RSA::load($privatekeystr);
+            }
+        }
+
+        static $e;
+        if (!isset($e)) {
+            $e = new BigInteger(self::$defaultExponent);
+        }
+
+        $n = clone self::$one;
+        $exponents = $coefficients = $primes = [];
+        $lcm = [
+            'top' => clone self::$one,
+            'bottom' => false
+        ];
+
+        do {
+            for ($i = 1; $i <= $num_primes; $i++) {
+                if ($i != $num_primes) {
+                    $primes[$i] = BigInteger::randomPrime($regSize);
+                } else {
+                    extract(BigInteger::minMaxBits($bits));
+                    /** @var BigInteger $min
+                     *  @var BigInteger $max
+                     */
+                    list($min) = $min->divide($n);
+                    $min = $min->add(self::$one);
+                    list($max) = $max->divide($n);
+                    $primes[$i] = BigInteger::randomRangePrime($min, $max);
+                }
+
+                // the first coefficient is calculated differently from the rest
+                // ie. instead of being $primes[1]->modInverse($primes[2]), it's $primes[2]->modInverse($primes[1])
+                if ($i > 2) {
+                    $coefficients[$i] = $n->modInverse($primes[$i]);
+                }
+
+                $n = $n->multiply($primes[$i]);
+
+                $temp = $primes[$i]->subtract(self::$one);
+
+                // textbook RSA implementations use Euler's totient function instead of the least common multiple.
+                // see http://en.wikipedia.org/wiki/Euler%27s_totient_function
+                $lcm['top'] = $lcm['top']->multiply($temp);
+                $lcm['bottom'] = $lcm['bottom'] === false ? $temp : $lcm['bottom']->gcd($temp);
+            }
+
+            list($temp) = $lcm['top']->divide($lcm['bottom']);
+            $gcd = $temp->gcd($e);
+            $i0 = 1;
+        } while (!$gcd->equals(self::$one));
+
+        $coefficients[2] = $primes[2]->modInverse($primes[1]);
+
+        $d = $e->modInverse($temp);
+
+        foreach ($primes as $i => $prime) {
+            $temp = $prime->subtract(self::$one);
+            $exponents[$i] = $e->modInverse($temp);
+        }
+
+        // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.2>:
+        // RSAPrivateKey ::= SEQUENCE {
+        //     version           Version,
+        //     modulus           INTEGER,  -- n
+        //     publicExponent    INTEGER,  -- e
+        //     privateExponent   INTEGER,  -- d
+        //     prime1            INTEGER,  -- p
+        //     prime2            INTEGER,  -- q
+        //     exponent1         INTEGER,  -- d mod (p-1)
+        //     exponent2         INTEGER,  -- d mod (q-1)
+        //     coefficient       INTEGER,  -- (inverse of q) mod p
+        //     otherPrimeInfos   OtherPrimeInfos OPTIONAL
+        // }
+        $privatekey = new PrivateKey();
+        $privatekey->modulus = $n;
+        $privatekey->k = $bits >> 3;
+        $privatekey->publicExponent = $e;
+        $privatekey->exponent = $d;
+        $privatekey->primes = $primes;
+        $privatekey->exponents = $exponents;
+        $privatekey->coefficients = $coefficients;
+
+        /*
+        $publickey = new PublicKey;
+        $publickey->modulus = $n;
+        $publickey->k = $bits >> 3;
+        $publickey->exponent = $e;
+        $publickey->publicExponent = $e;
+        $publickey->isPublic = true;
+        */
+
+        return $privatekey;
+    }
+
+    /**
+     * OnLoad Handler
+     *
+     * @return bool
+     */
+    protected static function onLoad(array $components)
+    {
+        $key = $components['isPublicKey'] ?
+            new PublicKey() :
+            new PrivateKey();
+
+        $key->modulus = $components['modulus'];
+        $key->publicExponent = $components['publicExponent'];
+        $key->k = $key->modulus->getLengthInBytes();
+
+        if ($components['isPublicKey'] || !isset($components['privateExponent'])) {
+            $key->exponent = $key->publicExponent;
+        } else {
+            $key->privateExponent = $components['privateExponent'];
+            $key->exponent = $key->privateExponent;
+            $key->primes = $components['primes'];
+            $key->exponents = $components['exponents'];
+            $key->coefficients = $components['coefficients'];
+        }
+
+        if ($components['format'] == PSS::class) {
+            // in the X509 world RSA keys are assumed to use PKCS1 padding by default. only if the key is
+            // explicitly a PSS key is the use of PSS assumed. phpseclib does not work like this. phpseclib
+            // uses PSS padding by default. it assumes the more secure method by default and altho it provides
+            // for the less secure PKCS1 method you have to go out of your way to use it. this is consistent
+            // with the latest trends in crypto. libsodium (NaCl) is actually a little more extreme in that
+            // not only does it defaults to the most secure methods - it doesn't even let you choose less
+            // secure methods
+            //$key = $key->withPadding(self::SIGNATURE_PSS);
+            if (isset($components['hash'])) {
+                $key = $key->withHash($components['hash']);
+            }
+            if (isset($components['MGFHash'])) {
+                $key = $key->withMGFHash($components['MGFHash']);
+            }
+            if (isset($components['saltLength'])) {
+                $key = $key->withSaltLength($components['saltLength']);
+            }
+        }
+
+        return $key;
+    }
+
+    /**
+     * Initialize static variables
+     */
+    protected static function initialize_static_variables()
+    {
+        if (!isset(self::$configFile)) {
+            self::$configFile = dirname(__FILE__) . '/../openssl.cnf';
+        }
+
+        parent::initialize_static_variables();
+    }
+
+    /**
+     * Constructor
+     *
+     * PublicKey and PrivateKey objects can only be created from abstract RSA class
+     */
+    protected function __construct()
+    {
+        parent::__construct();
+
+        $this->hLen = $this->hash->getLengthInBytes();
+        $this->mgfHash = new Hash('sha256');
+        $this->mgfHLen = $this->mgfHash->getLengthInBytes();
+    }
+
+    /**
+     * Integer-to-Octet-String primitive
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-4.1 RFC3447#section-4.1}.
+     *
+     * @param bool|Math\BigInteger $x
+     * @param int $xLen
+     * @return bool|string
+     */
+    protected function i2osp($x, $xLen)
+    {
+        if ($x === false) {
+            return false;
+        }
+        $x = $x->toBytes();
+        if (strlen($x) > $xLen) {
+            throw new \OutOfRangeException('Resultant string length out of range');
+        }
+        return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
+    }
+
+    /**
+     * Octet-String-to-Integer primitive
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-4.2 RFC3447#section-4.2}.
+     *
+     * @param string $x
+     * @return Math\BigInteger
+     */
+    protected function os2ip($x)
+    {
+        return new BigInteger($x, 256);
+    }
+
+    /**
+     * EMSA-PKCS1-V1_5-ENCODE
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}.
+     *
+     * @param string $m
+     * @param int $emLen
+     * @throws \LengthException if the intended encoded message length is too short
+     * @return string
+     */
+    protected function emsa_pkcs1_v1_5_encode($m, $emLen)
+    {
+        $h = $this->hash->hash($m);
+
+        // see http://tools.ietf.org/html/rfc3447#page-43
+        switch ($this->hash->getHash()) {
+            case 'md2':
+                $t = "\x30\x20\x30\x0c\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x02\x05\x00\x04\x10";
+                break;
+            case 'md5':
+                $t = "\x30\x20\x30\x0c\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x05\x05\x00\x04\x10";
+                break;
+            case 'sha1':
+                $t = "\x30\x21\x30\x09\x06\x05\x2b\x0e\x03\x02\x1a\x05\x00\x04\x14";
+                break;
+            case 'sha256':
+                $t = "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20";
+                break;
+            case 'sha384':
+                $t = "\x30\x41\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x02\x05\x00\x04\x30";
+                break;
+            case 'sha512':
+                $t = "\x30\x51\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x03\x05\x00\x04\x40";
+                break;
+            // from https://www.emc.com/collateral/white-papers/h11300-pkcs-1v2-2-rsa-cryptography-standard-wp.pdf#page=40
+            case 'sha224':
+                $t = "\x30\x2d\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x04\x05\x00\x04\x1c";
+                break;
+            case 'sha512/224':
+                $t = "\x30\x2d\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x05\x05\x00\x04\x1c";
+                break;
+            case 'sha512/256':
+                $t = "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x06\x05\x00\x04\x20";
+        }
+        $t .= $h;
+        $tLen = strlen($t);
+
+        if ($emLen < $tLen + 11) {
+            throw new \LengthException('Intended encoded message length too short');
+        }
+
+        $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3);
+
+        $em = "\0\1$ps\0$t";
+
+        return $em;
+    }
+
+    /**
+     * EMSA-PKCS1-V1_5-ENCODE (without NULL)
+     *
+     * Quoting https://tools.ietf.org/html/rfc8017#page-65,
+     *
+     * "The parameters field associated with id-sha1, id-sha224, id-sha256,
+     *  id-sha384, id-sha512, id-sha512/224, and id-sha512/256 should
+     *  generally be omitted, but if present, it shall have a value of type
+     *  NULL"
+     *
+     * @param string $m
+     * @param int $emLen
+     * @return string
+     */
+    protected function emsa_pkcs1_v1_5_encode_without_null($m, $emLen)
+    {
+        $h = $this->hash->hash($m);
+
+        // see http://tools.ietf.org/html/rfc3447#page-43
+        switch ($this->hash->getHash()) {
+            case 'sha1':
+                $t = "\x30\x1f\x30\x07\x06\x05\x2b\x0e\x03\x02\x1a\x04\x14";
+                break;
+            case 'sha256':
+                $t = "\x30\x2f\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x04\x20";
+                break;
+            case 'sha384':
+                $t = "\x30\x3f\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x02\x04\x30";
+                break;
+            case 'sha512':
+                $t = "\x30\x4f\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x03\x04\x40";
+                break;
+            // from https://www.emc.com/collateral/white-papers/h11300-pkcs-1v2-2-rsa-cryptography-standard-wp.pdf#page=40
+            case 'sha224':
+                $t = "\x30\x2b\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x04\x04\x1c";
+                break;
+            case 'sha512/224':
+                $t = "\x30\x2b\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x05\x04\x1c";
+                break;
+            case 'sha512/256':
+                $t = "\x30\x2f\x30\x0b\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x06\x04\x20";
+                break;
+            default:
+                throw new UnsupportedAlgorithmException('md2 and md5 require NULLs');
+        }
+        $t .= $h;
+        $tLen = strlen($t);
+
+        if ($emLen < $tLen + 11) {
+            throw new \LengthException('Intended encoded message length too short');
+        }
+
+        $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3);
+
+        $em = "\0\1$ps\0$t";
+
+        return $em;
+    }
+
+    /**
+     * MGF1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#appendix-B.2.1 RFC3447#appendix-B.2.1}.
+     *
+     * @param string $mgfSeed
+     * @param int $maskLen
+     * @return string
+     */
+    protected function mgf1($mgfSeed, $maskLen)
+    {
+        // if $maskLen would yield strings larger than 4GB, PKCS#1 suggests a "Mask too long" error be output.
+
+        $t = '';
+        $count = ceil($maskLen / $this->mgfHLen);
+        for ($i = 0; $i < $count; $i++) {
+            $c = pack('N', $i);
+            $t .= $this->mgfHash->hash($mgfSeed . $c);
+        }
+
+        return substr($t, 0, $maskLen);
+    }
+
+    /**
+     * Returns the key size
+     *
+     * More specifically, this returns the size of the modulo in bits.
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return !isset($this->modulus) ? 0 : $this->modulus->getLength();
+    }
+
+    /**
+     * Determines which hashing function should be used
+     *
+     * Used with signature production / verification and (if the encryption mode is self::PADDING_OAEP) encryption and
+     * decryption.
+     *
+     * @param string $hash
+     */
+    public function withHash($hash)
+    {
+        $new = clone $this;
+
+        // Crypt\Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
+        switch (strtolower($hash)) {
+            case 'md2':
+            case 'md5':
+            case 'sha1':
+            case 'sha256':
+            case 'sha384':
+            case 'sha512':
+            case 'sha224':
+            case 'sha512/224':
+            case 'sha512/256':
+                $new->hash = new Hash($hash);
+                break;
+            default:
+                throw new UnsupportedAlgorithmException(
+                    'The only supported hash algorithms are: md2, md5, sha1, sha256, sha384, sha512, sha224, sha512/224, sha512/256'
+                );
+        }
+        $new->hLen = $new->hash->getLengthInBytes();
+
+        return $new;
+    }
+
+    /**
+     * Determines which hashing function should be used for the mask generation function
+     *
+     * The mask generation function is used by self::PADDING_OAEP and self::PADDING_PSS and although it's
+     * best if Hash and MGFHash are set to the same thing this is not a requirement.
+     *
+     * @param string $hash
+     */
+    public function withMGFHash($hash)
+    {
+        $new = clone $this;
+
+        // Crypt\Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
+        switch (strtolower($hash)) {
+            case 'md2':
+            case 'md5':
+            case 'sha1':
+            case 'sha256':
+            case 'sha384':
+            case 'sha512':
+            case 'sha224':
+            case 'sha512/224':
+            case 'sha512/256':
+                $new->mgfHash = new Hash($hash);
+                break;
+            default:
+                throw new UnsupportedAlgorithmException(
+                    'The only supported hash algorithms are: md2, md5, sha1, sha256, sha384, sha512, sha224, sha512/224, sha512/256'
+                );
+        }
+        $new->mgfHLen = $new->mgfHash->getLengthInBytes();
+
+        return $new;
+    }
+
+    /**
+     * Returns the MGF hash algorithm currently being used
+     *
+     */
+    public function getMGFHash()
+    {
+        return clone $this->mgfHash;
+    }
+
+    /**
+     * Determines the salt length
+     *
+     * Used by RSA::PADDING_PSS
+     *
+     * To quote from {@link http://tools.ietf.org/html/rfc3447#page-38 RFC3447#page-38}:
+     *
+     *    Typical salt lengths in octets are hLen (the length of the output
+     *    of the hash function Hash) and 0.
+     *
+     * @param int $sLen
+     */
+    public function withSaltLength($sLen)
+    {
+        $new = clone $this;
+        $new->sLen = $sLen;
+        return $new;
+    }
+
+    /**
+     * Returns the salt length currently being used
+     *
+     */
+    public function getSaltLength()
+    {
+        return $this->sLen !== null ? $this->sLen : $this->hLen;
+    }
+
+    /**
+     * Determines the label
+     *
+     * Used by RSA::PADDING_OAEP
+     *
+     * To quote from {@link http://tools.ietf.org/html/rfc3447#page-17 RFC3447#page-17}:
+     *
+     *    Both the encryption and the decryption operations of RSAES-OAEP take
+     *    the value of a label L as input.  In this version of PKCS #1, L is
+     *    the empty string; other uses of the label are outside the scope of
+     *    this document.
+     *
+     * @param string $label
+     */
+    public function withLabel($label)
+    {
+        $new = clone $this;
+        $new->label = $label;
+        return $new;
+    }
+
+    /**
+     * Returns the label currently being used
+     *
+     */
+    public function getLabel()
+    {
+        return $this->label;
+    }
+
+    /**
+     * Determines the padding modes
+     *
+     * Example: $key->withPadding(RSA::ENCRYPTION_PKCS1 | RSA::SIGNATURE_PKCS1);
+     *
+     * @param int $padding
+     */
+    public function withPadding($padding)
+    {
+        $masks = [
+            self::ENCRYPTION_OAEP,
+            self::ENCRYPTION_PKCS1,
+            self::ENCRYPTION_NONE
+        ];
+        $encryptedCount = 0;
+        $selected = 0;
+        foreach ($masks as $mask) {
+            if ($padding & $mask) {
+                $selected = $mask;
+                $encryptedCount++;
+            }
+        }
+        if ($encryptedCount > 1) {
+            throw new InconsistentSetupException('Multiple encryption padding modes have been selected; at most only one should be selected');
+        }
+        $encryptionPadding = $selected;
+
+        $masks = [
+            self::SIGNATURE_PSS,
+            self::SIGNATURE_RELAXED_PKCS1,
+            self::SIGNATURE_PKCS1
+        ];
+        $signatureCount = 0;
+        $selected = 0;
+        foreach ($masks as $mask) {
+            if ($padding & $mask) {
+                $selected = $mask;
+                $signatureCount++;
+            }
+        }
+        if ($signatureCount > 1) {
+            throw new InconsistentSetupException('Multiple signature padding modes have been selected; at most only one should be selected');
+        }
+        $signaturePadding = $selected;
+
+        $new = clone $this;
+        if ($encryptedCount) {
+            $new->encryptionPadding = $encryptionPadding;
+        }
+        if ($signatureCount) {
+            $new->signaturePadding = $signaturePadding;
+        }
+        return $new;
+    }
+
+    /**
+     * Returns the padding currently being used
+     *
+     */
+    public function getPadding()
+    {
+        return $this->signaturePadding | $this->encryptionPadding;
+    }
+
+    /**
+     * Returns the current engine being used
+     *
+     * OpenSSL is only used in this class (and it's subclasses) for key generation
+     * Even then it depends on the parameters you're using. It's not used for
+     * multi-prime RSA nor is it used if the key length is outside of the range
+     * supported by OpenSSL
+     *
+     * @see self::useInternalEngine()
+     * @see self::useBestEngine()
+     * @return string
+     */
+    public function getEngine()
+    {
+        if (!isset(self::$engines['PHP'])) {
+            self::useBestEngine();
+        }
+        return self::$engines['OpenSSL'] && self::$defaultExponent == 65537 ?
+            'OpenSSL' :
+            'PHP';
+    }
+
+    /**
+     * Enable RSA Blinding
+     *
+     */
+    public static function enableBlinding()
+    {
+        static::$enableBlinding = true;
+    }
+
+    /**
+     * Disable RSA Blinding
+     *
+     */
+    public static function disableBlinding()
+    {
+        static::$enableBlinding = false;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/JWK.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/JWK.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,142 @@
+<?php
+
+/**
+ * JSON Web Key (RFC7517) Formatted RSA Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\JWK as Progenitor;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * JWK Formatted RSA Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class JWK extends Progenitor
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        if ($key->kty != 'RSA') {
+            throw new \RuntimeException('Only RSA JWK keys are supported');
+        }
+
+        $count = $publicCount = 0;
+        $vars = ['n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi'];
+        foreach ($vars as $var) {
+            if (!isset($key->$var) || !is_string($key->$var)) {
+                continue;
+            }
+            $count++;
+            $value = new BigInteger(Strings::base64url_decode($key->$var), 256);
+            switch ($var) {
+                case 'n':
+                    $publicCount++;
+                    $components['modulus'] = $value;
+                    break;
+                case 'e':
+                    $publicCount++;
+                    $components['publicExponent'] = $value;
+                    break;
+                case 'd':
+                    $components['privateExponent'] = $value;
+                    break;
+                case 'p':
+                    $components['primes'][1] = $value;
+                    break;
+                case 'q':
+                    $components['primes'][2] = $value;
+                    break;
+                case 'dp':
+                    $components['exponents'][1] = $value;
+                    break;
+                case 'dq':
+                    $components['exponents'][2] = $value;
+                    break;
+                case 'qi':
+                    $components['coefficients'][2] = $value;
+            }
+        }
+
+        if ($count == count($vars)) {
+            return $components + ['isPublicKey' => false];
+        }
+
+        if ($count == 2 && $publicCount == 2) {
+            return $components + ['isPublicKey' => true];
+        }
+
+        throw new \UnexpectedValueException('Key does not have an appropriate number of RSA parameters');
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        if (count($primes) != 2) {
+            throw new \InvalidArgumentException('JWK does not support multi-prime RSA keys');
+        }
+
+        $key = [
+            'kty' => 'RSA',
+            'n' => Strings::base64url_encode($n->toBytes()),
+            'e' => Strings::base64url_encode($e->toBytes()),
+            'd' => Strings::base64url_encode($d->toBytes()),
+            'p' => Strings::base64url_encode($primes[1]->toBytes()),
+            'q' => Strings::base64url_encode($primes[2]->toBytes()),
+            'dp' => Strings::base64url_encode($exponents[1]->toBytes()),
+            'dq' => Strings::base64url_encode($exponents[2]->toBytes()),
+            'qi' => Strings::base64url_encode($coefficients[2]->toBytes())
+        ];
+
+        return self::wrapKey($key, $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = [])
+    {
+        $key = [
+            'kty' => 'RSA',
+            'n' => Strings::base64url_encode($n->toBytes()),
+            'e' => Strings::base64url_encode($e->toBytes())
+        ];
+
+        return self::wrapKey($key, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/MSBLOB.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/MSBLOB.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/MSBLOB.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,228 @@
+<?php
+
+/**
+ * Miccrosoft BLOB Formatted RSA Key Handler
+ *
+ * More info:
+ *
+ * https://msdn.microsoft.com/en-us/library/windows/desktop/aa375601(v=vs.85).aspx
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Microsoft BLOB Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class MSBLOB
+{
+    /**
+     * Public/Private Key Pair
+     *
+     */
+    const PRIVATEKEYBLOB = 0x7;
+    /**
+     * Public Key
+     *
+     */
+    const PUBLICKEYBLOB = 0x6;
+    /**
+     * Public Key
+     *
+     */
+    const PUBLICKEYBLOBEX = 0xA;
+    /**
+     * RSA public key exchange algorithm
+     *
+     */
+    const CALG_RSA_KEYX = 0x0000A400;
+    /**
+     * RSA public key exchange algorithm
+     *
+     */
+    const CALG_RSA_SIGN = 0x00002400;
+    /**
+     * Public Key
+     *
+     */
+    const RSA1 = 0x31415352;
+    /**
+     * Private Key
+     *
+     */
+    const RSA2 = 0x32415352;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        $key = Strings::base64_decode($key);
+
+        if (!is_string($key)) {
+            throw new \UnexpectedValueException('Base64 decoding produced an error');
+        }
+        if (strlen($key) < 20) {
+            throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        // PUBLICKEYSTRUC  publickeystruc
+        // https://msdn.microsoft.com/en-us/library/windows/desktop/aa387453(v=vs.85).aspx
+        extract(unpack('atype/aversion/vreserved/Valgo', Strings::shift($key, 8)));
+        /**
+         * @var string $type
+         * @var string $version
+         * @var integer $reserved
+         * @var integer $algo
+         */
+        switch (ord($type)) {
+            case self::PUBLICKEYBLOB:
+            case self::PUBLICKEYBLOBEX:
+                $publickey = true;
+                break;
+            case self::PRIVATEKEYBLOB:
+                $publickey = false;
+                break;
+            default:
+                throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        $components = ['isPublicKey' => $publickey];
+
+        // https://msdn.microsoft.com/en-us/library/windows/desktop/aa375549(v=vs.85).aspx
+        switch ($algo) {
+            case self::CALG_RSA_KEYX:
+            case self::CALG_RSA_SIGN:
+                break;
+            default:
+                throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        // RSAPUBKEY rsapubkey
+        // https://msdn.microsoft.com/en-us/library/windows/desktop/aa387685(v=vs.85).aspx
+        // could do V for pubexp but that's unsigned 32-bit whereas some PHP installs only do signed 32-bit
+        extract(unpack('Vmagic/Vbitlen/a4pubexp', Strings::shift($key, 12)));
+        /**
+         * @var integer $magic
+         * @var integer $bitlen
+         * @var string $pubexp
+         */
+        switch ($magic) {
+            case self::RSA2:
+                $components['isPublicKey'] = false;
+                // fall-through
+            case self::RSA1:
+                break;
+            default:
+                throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        $baseLength = $bitlen / 16;
+        if (strlen($key) != 2 * $baseLength && strlen($key) != 9 * $baseLength) {
+            throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+
+        $components[$components['isPublicKey'] ? 'publicExponent' : 'privateExponent'] = new BigInteger(strrev($pubexp), 256);
+        // BYTE modulus[rsapubkey.bitlen/8]
+        $components['modulus'] = new BigInteger(strrev(Strings::shift($key, $bitlen / 8)), 256);
+
+        if ($publickey) {
+            return $components;
+        }
+
+        $components['isPublicKey'] = false;
+
+        // BYTE prime1[rsapubkey.bitlen/16]
+        $components['primes'] = [1 => new BigInteger(strrev(Strings::shift($key, $bitlen / 16)), 256)];
+        // BYTE prime2[rsapubkey.bitlen/16]
+        $components['primes'][] = new BigInteger(strrev(Strings::shift($key, $bitlen / 16)), 256);
+        // BYTE exponent1[rsapubkey.bitlen/16]
+        $components['exponents'] = [1 => new BigInteger(strrev(Strings::shift($key, $bitlen / 16)), 256)];
+        // BYTE exponent2[rsapubkey.bitlen/16]
+        $components['exponents'][] = new BigInteger(strrev(Strings::shift($key, $bitlen / 16)), 256);
+        // BYTE coefficient[rsapubkey.bitlen/16]
+        $components['coefficients'] = [2 => new BigInteger(strrev(Strings::shift($key, $bitlen / 16)), 256)];
+        if (isset($components['privateExponent'])) {
+            $components['publicExponent'] = $components['privateExponent'];
+        }
+        // BYTE privateExponent[rsapubkey.bitlen/8]
+        $components['privateExponent'] = new BigInteger(strrev(Strings::shift($key, $bitlen / 8)), 256);
+
+        return $components;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '')
+    {
+        if (count($primes) != 2) {
+            throw new \InvalidArgumentException('MSBLOB does not support multi-prime RSA keys');
+        }
+
+        if (!empty($password) && is_string($password)) {
+            throw new UnsupportedFormatException('MSBLOB private keys do not support encryption');
+        }
+
+        $n = strrev($n->toBytes());
+        $e = str_pad(strrev($e->toBytes()), 4, "\0");
+        $key = pack('aavV', chr(self::PRIVATEKEYBLOB), chr(2), 0, self::CALG_RSA_KEYX);
+        $key .= pack('VVa*', self::RSA2, 8 * strlen($n), $e);
+        $key .= $n;
+        $key .= strrev($primes[1]->toBytes());
+        $key .= strrev($primes[2]->toBytes());
+        $key .= strrev($exponents[1]->toBytes());
+        $key .= strrev($exponents[2]->toBytes());
+        $key .= strrev($coefficients[2]->toBytes());
+        $key .= strrev($d->toBytes());
+
+        return Strings::base64_encode($key);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e)
+    {
+        $n = strrev($n->toBytes());
+        $e = str_pad(strrev($e->toBytes()), 4, "\0");
+        $key = pack('aavV', chr(self::PUBLICKEYBLOB), chr(2), 0, self::CALG_RSA_KEYX);
+        $key .= pack('VVa*', self::RSA1, 8 * strlen($n), $e);
+        $key .= $n;
+
+        return Strings::base64_encode($key);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/OpenSSH.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/OpenSSH.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,132 @@
+<?php
+
+/**
+ * OpenSSH Formatted RSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\OpenSSH as Progenitor;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * OpenSSH Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSH extends Progenitor
+{
+    /**
+     * Supported Key Types
+     *
+     * @var array
+     */
+    protected static $types = ['ssh-rsa'];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        $parsed = parent::load($key, $password);
+
+        if (isset($parsed['paddedKey'])) {
+            list($type) = Strings::unpackSSH2('s', $parsed['paddedKey']);
+            if ($type != $parsed['type']) {
+                throw new \RuntimeException("The public and private keys are not of the same type ($type vs $parsed[type])");
+            }
+
+            $primes = $coefficients = [];
+
+            list(
+                $modulus,
+                $publicExponent,
+                $privateExponent,
+                $coefficients[2],
+                $primes[1],
+                $primes[2],
+                $comment,
+            ) = Strings::unpackSSH2('i6s', $parsed['paddedKey']);
+
+            $temp = $primes[1]->subtract($one);
+            $exponents = [1 => $publicExponent->modInverse($temp)];
+            $temp = $primes[2]->subtract($one);
+            $exponents[] = $publicExponent->modInverse($temp);
+
+            $isPublicKey = false;
+
+            return compact('publicExponent', 'modulus', 'privateExponent', 'primes', 'coefficients', 'exponents', 'comment', 'isPublicKey');
+        }
+
+        list($publicExponent, $modulus) = Strings::unpackSSH2('ii', $parsed['publicKey']);
+
+        return [
+            'isPublicKey' => true,
+            'modulus' => $modulus,
+            'publicExponent' => $publicExponent,
+            'comment' => $parsed['comment']
+        ];
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = [])
+    {
+        $RSAPublicKey = Strings::packSSH2('sii', 'ssh-rsa', $e, $n);
+
+        if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+            return $RSAPublicKey;
+        }
+
+        $comment = isset($options['comment']) ? $options['comment'] : self::$comment;
+        $RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . $comment;
+
+        return $RSAPublicKey;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        $publicKey = self::savePublicKey($n, $e, ['binary' => true]);
+        $privateKey = Strings::packSSH2('si6', 'ssh-rsa', $n, $e, $d, $coefficients[2], $primes[1], $primes[2]);
+
+        return self::wrapPrivateKey($publicKey, $privateKey, $password, $options);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,160 @@
+<?php
+
+/**
+ * PKCS#1 Formatted RSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by File/X509.php
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN RSA PRIVATE KEY-----
+ * -----BEGIN RSA PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pem format (as specified by -m)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS1 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#1 Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS1 extends Progenitor
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (strpos($key, 'PUBLIC') !== false) {
+            $components = ['isPublicKey' => true];
+        } elseif (strpos($key, 'PRIVATE') !== false) {
+            $components = ['isPublicKey' => false];
+        } else {
+            $components = [];
+        }
+
+        $key = parent::load($key, $password);
+
+        $decoded = ASN1::decodeBER($key);
+        if (!$decoded) {
+            throw new \RuntimeException('Unable to decode BER');
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\RSAPrivateKey::MAP);
+        if (is_array($key)) {
+            $components += [
+                'modulus' => $key['modulus'],
+                'publicExponent' => $key['publicExponent'],
+                'privateExponent' => $key['privateExponent'],
+                'primes' => [1 => $key['prime1'], $key['prime2']],
+                'exponents' => [1 => $key['exponent1'], $key['exponent2']],
+                'coefficients' => [2 => $key['coefficient']]
+            ];
+            if ($key['version'] == 'multi') {
+                foreach ($key['otherPrimeInfos'] as $primeInfo) {
+                    $components['primes'][] = $primeInfo['prime'];
+                    $components['exponents'][] = $primeInfo['exponent'];
+                    $components['coefficients'][] = $primeInfo['coefficient'];
+                }
+            }
+            if (!isset($components['isPublicKey'])) {
+                $components['isPublicKey'] = false;
+            }
+            return $components;
+        }
+
+        $key = ASN1::asn1map($decoded[0], Maps\RSAPublicKey::MAP);
+
+        if (!is_array($key)) {
+            throw new \RuntimeException('Unable to perform ASN1 mapping');
+        }
+
+        if (!isset($components['isPublicKey'])) {
+            $components['isPublicKey'] = true;
+        }
+
+        return $components + $key;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        $num_primes = count($primes);
+        $key = [
+            'version' => $num_primes == 2 ? 'two-prime' : 'multi',
+            'modulus' => $n,
+            'publicExponent' => $e,
+            'privateExponent' => $d,
+            'prime1' => $primes[1],
+            'prime2' => $primes[2],
+            'exponent1' => $exponents[1],
+            'exponent2' => $exponents[2],
+            'coefficient' => $coefficients[2]
+        ];
+        for ($i = 3; $i <= $num_primes; $i++) {
+            $key['otherPrimeInfos'][] = [
+                'prime' => $primes[$i],
+                'exponent' => $exponents[$i],
+                'coefficient' => $coefficients[$i]
+            ];
+        }
+
+        $key = ASN1::encodeDER($key, Maps\RSAPrivateKey::MAP);
+
+        return self::wrapPrivateKey($key, 'RSA', $password, $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e)
+    {
+        $key = [
+            'modulus' => $n,
+            'publicExponent' => $e
+        ];
+
+        $key = ASN1::encodeDER($key, Maps\RSAPublicKey::MAP);
+
+        return self::wrapPublicKey($key, 'RSA');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * PKCS#8 Formatted RSA Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
+ * is specific to private keys it's basically creating a DER-encoded wrapper
+ * for keys. This just extends that same concept to public keys (much like ssh-keygen)
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#8 Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS8 extends Progenitor
+{
+    /**
+     * OID Name
+     *
+     * @var string
+     */
+    const OID_NAME = 'rsaEncryption';
+
+    /**
+     * OID Value
+     *
+     * @var string
+     */
+    const OID_VALUE = '1.2.840.113549.1.1.1';
+
+    /**
+     * Child OIDs loaded
+     *
+     * @var bool
+     */
+    protected static $childOIDsLoaded = false;
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        $key = parent::load($key, $password);
+
+        if (isset($key['privateKey'])) {
+            $components['isPublicKey'] = false;
+            $type = 'private';
+        } else {
+            $components['isPublicKey'] = true;
+            $type = 'public';
+        }
+
+        $result = $components + PKCS1::load($key[$type . 'Key']);
+
+        if (isset($key['meta'])) {
+            $result['meta'] = $key['meta'];
+        }
+
+        return $result;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        $key = PKCS1::savePrivateKey($n, $e, $d, $primes, $exponents, $coefficients);
+        $key = ASN1::extractBER($key);
+        return self::wrapPrivateKey($key, [], null, $password, null, '', $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = [])
+    {
+        $key = PKCS1::savePublicKey($n, $e);
+        $key = ASN1::extractBER($key);
+        return self::wrapPublicKey($key, null);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PSS.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PSS.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PSS.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,238 @@
+<?php
+
+/**
+ * PKCS#8 Formatted RSA-PSS Key Handler
+ *
+ * PHP version 5
+ *
+ * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
+ *
+ * Processes keys with the following headers:
+ *
+ * -----BEGIN ENCRYPTED PRIVATE KEY-----
+ * -----BEGIN PRIVATE KEY-----
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to "openssl genpkey -algorithm rsa-pss".
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PKCS#8 Formatted RSA-PSS Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PSS extends Progenitor
+{
+    /**
+     * OID Name
+     *
+     * @var string
+     */
+    const OID_NAME = 'id-RSASSA-PSS';
+
+    /**
+     * OID Value
+     *
+     * @var string
+     */
+    const OID_VALUE = '1.2.840.113549.1.1.10';
+
+    /**
+     * OIDs loaded
+     *
+     * @var bool
+     */
+    private static $oidsLoaded = false;
+
+    /**
+     * Child OIDs loaded
+     *
+     * @var bool
+     */
+    protected static $childOIDsLoaded = false;
+
+    /**
+     * Initialize static variables
+     */
+    private static function initialize_static_variables()
+    {
+        if (!self::$oidsLoaded) {
+            ASN1::loadOIDs([
+                'md2' => '1.2.840.113549.2.2',
+                'md4' => '1.2.840.113549.2.4',
+                'md5' => '1.2.840.113549.2.5',
+                'id-sha1' => '1.3.14.3.2.26',
+                'id-sha256' => '2.16.840.1.101.3.4.2.1',
+                'id-sha384' => '2.16.840.1.101.3.4.2.2',
+                'id-sha512' => '2.16.840.1.101.3.4.2.3',
+                'id-sha224' => '2.16.840.1.101.3.4.2.4',
+                'id-sha512/224' => '2.16.840.1.101.3.4.2.5',
+                'id-sha512/256' => '2.16.840.1.101.3.4.2.6',
+
+                'id-mgf1' => '1.2.840.113549.1.1.8'
+            ]);
+            self::$oidsLoaded = true;
+        }
+    }
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        self::initialize_static_variables();
+
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        $components = ['isPublicKey' => strpos($key, 'PUBLIC') !== false];
+
+        $key = parent::load($key, $password);
+
+        $type = isset($key['privateKey']) ? 'private' : 'public';
+
+        $result = $components + PKCS1::load($key[$type . 'Key']);
+
+        if (isset($key[$type . 'KeyAlgorithm']['parameters'])) {
+            $decoded = ASN1::decodeBER($key[$type . 'KeyAlgorithm']['parameters']);
+            if ($decoded === false) {
+                throw new \UnexpectedValueException('Unable to decode parameters');
+            }
+            $params = ASN1::asn1map($decoded[0], Maps\RSASSA_PSS_params::MAP);
+        } else {
+            $params = [];
+        }
+
+        if (isset($params['maskGenAlgorithm']['parameters'])) {
+            $decoded = ASN1::decodeBER($params['maskGenAlgorithm']['parameters']);
+            if ($decoded === false) {
+                throw new \UnexpectedValueException('Unable to decode parameters');
+            }
+            $params['maskGenAlgorithm']['parameters'] = ASN1::asn1map($decoded[0], Maps\HashAlgorithm::MAP);
+        } else {
+            $params['maskGenAlgorithm'] = [
+                'algorithm' => 'id-mgf1',
+                'parameters' => ['algorithm' => 'id-sha1']
+            ];
+        }
+
+        if (!isset($params['hashAlgorithm']['algorithm'])) {
+            $params['hashAlgorithm']['algorithm'] = 'id-sha1';
+        }
+
+        $result['hash'] = str_replace('id-', '', $params['hashAlgorithm']['algorithm']);
+        $result['MGFHash'] = str_replace('id-', '', $params['maskGenAlgorithm']['parameters']['algorithm']);
+        if (isset($params['saltLength'])) {
+            $result['saltLength'] = (int) $params['saltLength']->toString();
+        }
+
+        if (isset($key['meta'])) {
+            $result['meta'] = $key['meta'];
+        }
+
+        return $result;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        self::initialize_static_variables();
+
+        $key = PKCS1::savePrivateKey($n, $e, $d, $primes, $exponents, $coefficients);
+        $key = ASN1::extractBER($key);
+        $params = self::savePSSParams($options);
+        return self::wrapPrivateKey($key, [], $params, $password, null, '', $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e, array $options = [])
+    {
+        self::initialize_static_variables();
+
+        $key = PKCS1::savePublicKey($n, $e);
+        $key = ASN1::extractBER($key);
+        $params = self::savePSSParams($options);
+        return self::wrapPublicKey($key, $params);
+    }
+
+    /**
+     * Encodes PSS parameters
+     *
+     * @param array $options
+     * @return string
+     */
+    public static function savePSSParams(array $options)
+    {
+        /*
+         The trailerField field is an integer.  It provides
+         compatibility with IEEE Std 1363a-2004 [P1363A].  The value
+         MUST be 1, which represents the trailer field with hexadecimal
+         value 0xBC.  Other trailer fields, including the trailer field
+         composed of HashID concatenated with 0xCC that is specified in
+         IEEE Std 1363a, are not supported.  Implementations that
+         perform signature generation MUST omit the trailerField field,
+         indicating that the default trailer field value was used.
+         Implementations that perform signature validation MUST
+         recognize both a present trailerField field with value 1 and an
+         absent trailerField field.
+
+         source: https://tools.ietf.org/html/rfc4055#page-9
+        */
+        $params = [
+            'trailerField' => new BigInteger(1)
+        ];
+        if (isset($options['hash'])) {
+            $params['hashAlgorithm']['algorithm'] = 'id-' . $options['hash'];
+        }
+        if (isset($options['MGFHash'])) {
+            $temp = ['algorithm' => 'id-' . $options['MGFHash']];
+            $temp = ASN1::encodeDER($temp, Maps\HashAlgorithm::MAP);
+            $params['maskGenAlgorithm'] = [
+                'algorithm' => 'id-mgf1',
+                'parameters' => new ASN1\Element($temp)
+            ];
+        }
+        if (isset($options['saltLength'])) {
+            $params['saltLength'] = new BigInteger($options['saltLength']);
+        }
+
+        return new ASN1\Element(ASN1::encodeDER($params, Maps\RSASSA_PSS_params::MAP));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PuTTY.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/PuTTY.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,121 @@
+<?php
+
+/**
+ * PuTTY Formatted RSA Key Handler
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\Formats\Keys\PuTTY as Progenitor;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * PuTTY Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PuTTY extends Progenitor
+{
+    /**
+     * Public Handler
+     *
+     * @var string
+     */
+    const PUBLIC_HANDLER = 'phpseclib3\Crypt\RSA\Formats\Keys\OpenSSH';
+
+    /**
+     * Algorithm Identifier
+     *
+     * @var array
+     */
+    protected static $types = ['ssh-rsa'];
+
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        $components = parent::load($key, $password);
+        if (!isset($components['private'])) {
+            return $components;
+        }
+        extract($components);
+        unset($components['public'], $components['private']);
+
+        $isPublicKey = false;
+
+        $result = Strings::unpackSSH2('ii', $public);
+        if ($result === false) {
+            throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+        list($publicExponent, $modulus) = $result;
+
+        $result = Strings::unpackSSH2('iiii', $private);
+        if ($result === false) {
+            throw new \UnexpectedValueException('Key appears to be malformed');
+        }
+        $primes = $coefficients = [];
+        list($privateExponent, $primes[1], $primes[2], $coefficients[2]) = $result;
+
+        $temp = $primes[1]->subtract($one);
+        $exponents = [1 => $publicExponent->modInverse($temp)];
+        $temp = $primes[2]->subtract($one);
+        $exponents[] = $publicExponent->modInverse($temp);
+
+        return compact('publicExponent', 'modulus', 'privateExponent', 'primes', 'coefficients', 'exponents', 'comment', 'isPublicKey');
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        if (count($primes) != 2) {
+            throw new \InvalidArgumentException('PuTTY does not support multi-prime RSA keys');
+        }
+
+        $public =  Strings::packSSH2('ii', $e, $n);
+        $private = Strings::packSSH2('iiii', $d, $primes[1], $primes[2], $coefficients[2]);
+
+        return self::wrapPrivateKey($public, $private, 'ssh-rsa', $password, $options);
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e)
+    {
+        return self::wrapPublicKey(Strings::packSSH2('ii', $e, $n), 'ssh-rsa');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/Raw.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/Raw.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,184 @@
+<?php
+
+/**
+ * Raw RSA Key Handler
+ *
+ * PHP version 5
+ *
+ * An array containing two \phpseclib3\Math\BigInteger objects.
+ *
+ * The exponent can be indexed with any of the following:
+ *
+ * 0, e, exponent, publicExponent
+ *
+ * The modulus can be indexed with any of the following:
+ *
+ * 1, n, modulo, modulus
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Raw RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Raw
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!is_array($key)) {
+            throw new \UnexpectedValueException('Key should be a array - not a ' . gettype($key));
+        }
+
+        $key = array_change_key_case($key, CASE_LOWER);
+
+        $components = ['isPublicKey' => false];
+
+        foreach (['e', 'exponent', 'publicexponent', 0, 'privateexponent', 'd'] as $index) {
+            if (isset($key[$index])) {
+                $components['publicExponent'] = $key[$index];
+                break;
+            }
+        }
+
+        foreach (['n', 'modulo', 'modulus', 1] as $index) {
+            if (isset($key[$index])) {
+                $components['modulus'] = $key[$index];
+                break;
+            }
+        }
+
+        if (!isset($components['publicExponent']) || !isset($components['modulus'])) {
+            throw new \UnexpectedValueException('Modulus / exponent not present');
+        }
+
+        if (isset($key['primes'])) {
+            $components['primes'] = $key['primes'];
+        } elseif (isset($key['p']) && isset($key['q'])) {
+            $indices = [
+                ['p', 'q'],
+                ['prime1', 'prime2']
+            ];
+            foreach ($indices as $index) {
+                list($i0, $i1) = $index;
+                if (isset($key[$i0]) && isset($key[$i1])) {
+                    $components['primes'] = [1 => $key[$i0], $key[$i1]];
+                }
+            }
+        }
+
+        if (isset($key['exponents'])) {
+            $components['exponents'] = $key['exponents'];
+        } else {
+            $indices = [
+                ['dp', 'dq'],
+                ['exponent1', 'exponent2']
+            ];
+            foreach ($indices as $index) {
+                list($i0, $i1) = $index;
+                if (isset($key[$i0]) && isset($key[$i1])) {
+                    $components['exponents'] = [1 => $key[$i0], $key[$i1]];
+                }
+            }
+        }
+
+        if (isset($key['coefficients'])) {
+            $components['coefficients'] = $key['coefficients'];
+        } else {
+            foreach (['inverseq', 'q\'', 'coefficient'] as $index) {
+                if (isset($key[$index])) {
+                    $components['coefficients'] = [2 => $key[$index]];
+                }
+            }
+        }
+
+        if (!isset($components['primes'])) {
+            $components['isPublicKey'] = true;
+            return $components;
+        }
+
+        if (!isset($components['exponents'])) {
+            $one = new BigInteger(1);
+            $temp = $components['primes'][1]->subtract($one);
+            $exponents = [1 => $components['publicExponent']->modInverse($temp)];
+            $temp = $components['primes'][2]->subtract($one);
+            $exponents[] = $components['publicExponent']->modInverse($temp);
+            $components['exponents'] = $exponents;
+        }
+
+        if (!isset($components['coefficients'])) {
+            $components['coefficients'] = [2 => $components['primes'][2]->modInverse($components['primes'][1])];
+        }
+
+        foreach (['privateexponent', 'd'] as $index) {
+            if (isset($key[$index])) {
+                $components['privateExponent'] = $key[$index];
+                break;
+            }
+        }
+
+        return $components;
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @param array $options optional
+     * @return array
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '', array $options = [])
+    {
+        if (!empty($password) && is_string($password)) {
+            throw new UnsupportedFormatException('Raw private keys do not support encryption');
+        }
+
+        return [
+            'e' => clone $e,
+            'n' => clone $n,
+            'd' => clone $d,
+            'primes' => array_map(function ($var) {
+                return clone $var;
+            }, $primes),
+            'exponents' => array_map(function ($var) {
+                return clone $var;
+            }, $exponents),
+            'coefficients' => array_map(function ($var) {
+                return clone $var;
+            }, $coefficients)
+        ];
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @return array
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e)
+    {
+        return ['e' => clone $e, 'n' => clone $n];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/XML.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/Formats/Keys/XML.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,171 @@
+<?php
+
+/**
+ * XML Formatted RSA Key Handler
+ *
+ * More info:
+ *
+ * http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
+ * http://www.w3.org/TR/xkms2/#XKMS_2_0_Paragraph_269
+ * http://en.wikipedia.org/wiki/XML_Signature
+ * http://en.wikipedia.org/wiki/XKMS
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA\Formats\Keys;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * XML Formatted RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class XML
+{
+    /**
+     * Break a public or private key down into its constituent components
+     *
+     * @param string $key
+     * @param string $password optional
+     * @return array
+     */
+    public static function load($key, $password = '')
+    {
+        if (!Strings::is_stringable($key)) {
+            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
+        }
+
+        if (!class_exists('DOMDocument')) {
+            throw new BadConfigurationException('The dom extension is not setup correctly on this system');
+        }
+
+        $components = [
+            'isPublicKey' => false,
+            'primes' => [],
+            'exponents' => [],
+            'coefficients' => []
+        ];
+
+        $use_errors = libxml_use_internal_errors(true);
+
+        $dom = new \DOMDocument();
+        if (substr($key, 0, 5) != '<?xml') {
+            $key = '<xml>' . $key . '</xml>';
+        }
+        if (!$dom->loadXML($key)) {
+            libxml_use_internal_errors($use_errors);
+            throw new \UnexpectedValueException('Key does not appear to contain XML');
+        }
+        $xpath = new \DOMXPath($dom);
+        $keys = ['modulus', 'exponent', 'p', 'q', 'dp', 'dq', 'inverseq', 'd'];
+        foreach ($keys as $key) {
+            // $dom->getElementsByTagName($key) is case-sensitive
+            $temp = $xpath->query("//*[translate(local-name(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz')='$key']");
+            if (!$temp->length) {
+                continue;
+            }
+            $value = new BigInteger(Strings::base64_decode($temp->item(0)->nodeValue), 256);
+            switch ($key) {
+                case 'modulus':
+                    $components['modulus'] = $value;
+                    break;
+                case 'exponent':
+                    $components['publicExponent'] = $value;
+                    break;
+                case 'p':
+                    $components['primes'][1] = $value;
+                    break;
+                case 'q':
+                    $components['primes'][2] = $value;
+                    break;
+                case 'dp':
+                    $components['exponents'][1] = $value;
+                    break;
+                case 'dq':
+                    $components['exponents'][2] = $value;
+                    break;
+                case 'inverseq':
+                    $components['coefficients'][2] = $value;
+                    break;
+                case 'd':
+                    $components['privateExponent'] = $value;
+            }
+        }
+
+        libxml_use_internal_errors($use_errors);
+
+        foreach ($components as $key => $value) {
+            if (is_array($value) && !count($value)) {
+                unset($components[$key]);
+            }
+        }
+
+        if (isset($components['modulus']) && isset($components['publicExponent'])) {
+            if (count($components) == 3) {
+                $components['isPublicKey'] = true;
+            }
+            return $components;
+        }
+
+        throw new \UnexpectedValueException('Modulus / exponent not present');
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @param BigInteger $d
+     * @param array $primes
+     * @param array $exponents
+     * @param array $coefficients
+     * @param string $password optional
+     * @return string
+     */
+    public static function savePrivateKey(BigInteger $n, BigInteger $e, BigInteger $d, array $primes, array $exponents, array $coefficients, $password = '')
+    {
+        if (count($primes) != 2) {
+            throw new \InvalidArgumentException('XML does not support multi-prime RSA keys');
+        }
+
+        if (!empty($password) && is_string($password)) {
+            throw new UnsupportedFormatException('XML private keys do not support encryption');
+        }
+
+        return "<RSAKeyPair>\r\n" .
+               '  <Modulus>' . Strings::base64_encode($n->toBytes()) . "</Modulus>\r\n" .
+               '  <Exponent>' . Strings::base64_encode($e->toBytes()) . "</Exponent>\r\n" .
+               '  <P>' . Strings::base64_encode($primes[1]->toBytes()) . "</P>\r\n" .
+               '  <Q>' . Strings::base64_encode($primes[2]->toBytes()) . "</Q>\r\n" .
+               '  <DP>' . Strings::base64_encode($exponents[1]->toBytes()) . "</DP>\r\n" .
+               '  <DQ>' . Strings::base64_encode($exponents[2]->toBytes()) . "</DQ>\r\n" .
+               '  <InverseQ>' . Strings::base64_encode($coefficients[2]->toBytes()) . "</InverseQ>\r\n" .
+               '  <D>' . Strings::base64_encode($d->toBytes()) . "</D>\r\n" .
+               '</RSAKeyPair>';
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @param BigInteger $n
+     * @param BigInteger $e
+     * @return string
+     */
+    public static function savePublicKey(BigInteger $n, BigInteger $e)
+    {
+        return "<RSAKeyValue>\r\n" .
+               '  <Modulus>' . Strings::base64_encode($n->toBytes()) . "</Modulus>\r\n" .
+               '  <Exponent>' . Strings::base64_encode($e->toBytes()) . "</Exponent>\r\n" .
+               '</RSAKeyValue>';
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,530 @@
+<?php
+
+/**
+ * RSA Private Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Crypt\RSA\Formats\Keys\PSS;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Raw RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PrivateKey extends RSA implements Common\PrivateKey
+{
+    use Common\Traits\PasswordProtected;
+
+    /**
+     * Primes for Chinese Remainder Theorem (ie. p and q)
+     *
+     * @var array
+     */
+    protected $primes;
+
+    /**
+     * Exponents for Chinese Remainder Theorem (ie. dP and dQ)
+     *
+     * @var array
+     */
+    protected $exponents;
+
+    /**
+     * Coefficients for Chinese Remainder Theorem (ie. qInv)
+     *
+     * @var array
+     */
+    protected $coefficients;
+
+    /**
+     * Private Exponent
+     *
+     * @var BigInteger
+     */
+    protected $privateExponent;
+
+    /**
+     * RSADP
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.2 RFC3447#section-5.1.2}.
+     *
+     * @return bool|BigInteger
+     */
+    private function rsadp(BigInteger $c)
+    {
+        if ($c->compare(self::$zero) < 0 || $c->compare($this->modulus) > 0) {
+            throw new \OutOfRangeException('Ciphertext representative out of range');
+        }
+        return $this->exponentiate($c);
+    }
+
+    /**
+     * RSASP1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.1 RFC3447#section-5.2.1}.
+     *
+     * @return bool|BigInteger
+     */
+    private function rsasp1(BigInteger $m)
+    {
+        if ($m->compare(self::$zero) < 0 || $m->compare($this->modulus) > 0) {
+            throw new \OutOfRangeException('Signature representative out of range');
+        }
+        return $this->exponentiate($m);
+    }
+
+    /**
+     * Exponentiate
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    protected function exponentiate(BigInteger $x)
+    {
+        switch (true) {
+            case empty($this->primes):
+            case $this->primes[1]->equals(self::$zero):
+            case empty($this->coefficients):
+            case $this->coefficients[2]->equals(self::$zero):
+            case empty($this->exponents):
+            case $this->exponents[1]->equals(self::$zero):
+                return $x->modPow($this->exponent, $this->modulus);
+        }
+
+        $num_primes = count($this->primes);
+
+        if (!static::$enableBlinding) {
+            $m_i = [
+                1 => $x->modPow($this->exponents[1], $this->primes[1]),
+                2 => $x->modPow($this->exponents[2], $this->primes[2])
+            ];
+            $h = $m_i[1]->subtract($m_i[2]);
+            $h = $h->multiply($this->coefficients[2]);
+            list(, $h) = $h->divide($this->primes[1]);
+            $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+            $r = $this->primes[1];
+            for ($i = 3; $i <= $num_primes; $i++) {
+                $m_i = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+                $r = $r->multiply($this->primes[$i - 1]);
+
+                $h = $m_i->subtract($m);
+                $h = $h->multiply($this->coefficients[$i]);
+                list(, $h) = $h->divide($this->primes[$i]);
+
+                $m = $m->add($r->multiply($h));
+            }
+        } else {
+            $smallest = $this->primes[1];
+            for ($i = 2; $i <= $num_primes; $i++) {
+                if ($smallest->compare($this->primes[$i]) > 0) {
+                    $smallest = $this->primes[$i];
+                }
+            }
+
+            $r = BigInteger::randomRange(self::$one, $smallest->subtract(self::$one));
+
+            $m_i = [
+                1 => $this->blind($x, $r, 1),
+                2 => $this->blind($x, $r, 2)
+            ];
+            $h = $m_i[1]->subtract($m_i[2]);
+            $h = $h->multiply($this->coefficients[2]);
+            list(, $h) = $h->divide($this->primes[1]);
+            $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+            $r = $this->primes[1];
+            for ($i = 3; $i <= $num_primes; $i++) {
+                $m_i = $this->blind($x, $r, $i);
+
+                $r = $r->multiply($this->primes[$i - 1]);
+
+                $h = $m_i->subtract($m);
+                $h = $h->multiply($this->coefficients[$i]);
+                list(, $h) = $h->divide($this->primes[$i]);
+
+                $m = $m->add($r->multiply($h));
+            }
+        }
+
+        return $m;
+    }
+
+    /**
+     * Performs RSA Blinding
+     *
+     * Protects against timing attacks by employing RSA Blinding.
+     * Returns $x->modPow($this->exponents[$i], $this->primes[$i])
+     *
+     * @param BigInteger $x
+     * @param BigInteger $r
+     * @param int $i
+     * @return BigInteger
+     */
+    private function blind(BigInteger $x, BigInteger $r, $i)
+    {
+        $x = $x->multiply($r->modPow($this->publicExponent, $this->primes[$i]));
+        $x = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+        $r = $r->modInverse($this->primes[$i]);
+        $x = $x->multiply($r);
+        list(, $x) = $x->divide($this->primes[$i]);
+
+        return $x;
+    }
+
+    /**
+     * EMSA-PSS-ENCODE
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.1 RFC3447#section-9.1.1}.
+     *
+     * @return string
+     * @param string $m
+     * @throws \RuntimeException on encoding error
+     * @param int $emBits
+     */
+    private function emsa_pss_encode($m, $emBits)
+    {
+        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8)
+        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;
+
+        $mHash = $this->hash->hash($m);
+        if ($emLen < $this->hLen + $sLen + 2) {
+            throw new \LengthException('RSA modulus too short');
+        }
+
+        $salt = Random::string($sLen);
+        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+        $h = $this->hash->hash($m2);
+        $ps = str_repeat(chr(0), $emLen - $sLen - $this->hLen - 2);
+        $db = $ps . chr(1) . $salt;
+        $dbMask = $this->mgf1($h, $emLen - $this->hLen - 1); // ie. stlren($db)
+        $maskedDB = $db ^ $dbMask;
+        $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
+        $em = $maskedDB . $h . chr(0xBC);
+
+        return $em;
+    }
+
+    /**
+     * RSASSA-PSS-SIGN
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.1 RFC3447#section-8.1.1}.
+     *
+     * @param string $m
+     * @return bool|string
+     */
+    private function rsassa_pss_sign($m)
+    {
+        // EMSA-PSS encoding
+
+        $em = $this->emsa_pss_encode($m, 8 * $this->k - 1);
+
+        // RSA signature
+
+        $m = $this->os2ip($em);
+        $s = $this->rsasp1($m);
+        $s = $this->i2osp($s, $this->k);
+
+        // Output the signature S
+
+        return $s;
+    }
+
+    /**
+     * RSASSA-PKCS1-V1_5-SIGN
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.1 RFC3447#section-8.2.1}.
+     *
+     * @param string $m
+     * @throws \LengthException if the RSA modulus is too short
+     * @return bool|string
+     */
+    private function rsassa_pkcs1_v1_5_sign($m)
+    {
+        // EMSA-PKCS1-v1_5 encoding
+
+        // If the encoding operation outputs "intended encoded message length too short," output "RSA modulus
+        // too short" and stop.
+        try {
+            $em = $this->emsa_pkcs1_v1_5_encode($m, $this->k);
+        } catch (\LengthException $e) {
+            throw new \LengthException('RSA modulus too short');
+        }
+
+        // RSA signature
+
+        $m = $this->os2ip($em);
+        $s = $this->rsasp1($m);
+        $s = $this->i2osp($s, $this->k);
+
+        // Output the signature S
+
+        return $s;
+    }
+
+    /**
+     * Create a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @return string
+     */
+    public function sign($message)
+    {
+        switch ($this->signaturePadding) {
+            case self::SIGNATURE_PKCS1:
+            case self::SIGNATURE_RELAXED_PKCS1:
+                return $this->rsassa_pkcs1_v1_5_sign($message);
+            //case self::SIGNATURE_PSS:
+            default:
+                return $this->rsassa_pss_sign($message);
+        }
+    }
+
+    /**
+     * RSAES-PKCS1-V1_5-DECRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.2 RFC3447#section-7.2.2}.
+     *
+     * @param string $c
+     * @return bool|string
+     */
+    private function rsaes_pkcs1_v1_5_decrypt($c)
+    {
+        // Length checking
+
+        if (strlen($c) != $this->k) { // or if k < 11
+            throw new \LengthException('Ciphertext representative too long');
+        }
+
+        // RSA decryption
+
+        $c = $this->os2ip($c);
+        $m = $this->rsadp($c);
+        $em = $this->i2osp($m, $this->k);
+
+        // EME-PKCS1-v1_5 decoding
+
+        if (ord($em[0]) != 0 || ord($em[1]) > 2) {
+            throw new \RuntimeException('Decryption error');
+        }
+
+        $ps = substr($em, 2, strpos($em, chr(0), 2) - 2);
+        $m = substr($em, strlen($ps) + 3);
+
+        if (strlen($ps) < 8) {
+            throw new \RuntimeException('Decryption error');
+        }
+
+        // Output M
+
+        return $m;
+    }
+
+    /**
+     * RSAES-OAEP-DECRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.2 RFC3447#section-7.1.2}.  The fact that the error
+     * messages aren't distinguishable from one another hinders debugging, but, to quote from RFC3447#section-7.1.2:
+     *
+     *    Note.  Care must be taken to ensure that an opponent cannot
+     *    distinguish the different error conditions in Step 3.g, whether by
+     *    error message or timing, or, more generally, learn partial
+     *    information about the encoded message EM.  Otherwise an opponent may
+     *    be able to obtain useful information about the decryption of the
+     *    ciphertext C, leading to a chosen-ciphertext attack such as the one
+     *    observed by Manger [36].
+     *
+     * @param string $c
+     * @return bool|string
+     */
+    private function rsaes_oaep_decrypt($c)
+    {
+        // Length checking
+
+        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        if (strlen($c) != $this->k || $this->k < 2 * $this->hLen + 2) {
+            throw new \LengthException('Ciphertext representative too long');
+        }
+
+        // RSA decryption
+
+        $c = $this->os2ip($c);
+        $m = $this->rsadp($c);
+        $em = $this->i2osp($m, $this->k);
+
+        // EME-OAEP decoding
+
+        $lHash = $this->hash->hash($this->label);
+        $y = ord($em[0]);
+        $maskedSeed = substr($em, 1, $this->hLen);
+        $maskedDB = substr($em, $this->hLen + 1);
+        $seedMask = $this->mgf1($maskedDB, $this->hLen);
+        $seed = $maskedSeed ^ $seedMask;
+        $dbMask = $this->mgf1($seed, $this->k - $this->hLen - 1);
+        $db = $maskedDB ^ $dbMask;
+        $lHash2 = substr($db, 0, $this->hLen);
+        $m = substr($db, $this->hLen);
+        $hashesMatch = hash_equals($lHash, $lHash2);
+        $leadingZeros = 1;
+        $patternMatch = 0;
+        $offset = 0;
+        for ($i = 0; $i < strlen($m); $i++) {
+            $patternMatch |= $leadingZeros & ($m[$i] === "\1");
+            $leadingZeros &= $m[$i] === "\0";
+            $offset += $patternMatch ? 0 : 1;
+        }
+
+        // we do | instead of || to avoid https://en.wikipedia.org/wiki/Short-circuit_evaluation
+        // to protect against timing attacks
+        if (!$hashesMatch | !$patternMatch) {
+            throw new \RuntimeException('Decryption error');
+        }
+
+        // Output the message M
+
+        return substr($m, $offset + 1);
+    }
+
+    /**
+     * Raw Encryption / Decryption
+     *
+     * Doesn't use padding and is not recommended.
+     *
+     * @param string $m
+     * @return bool|string
+     * @throws \LengthException if strlen($m) > $this->k
+     */
+    private function raw_encrypt($m)
+    {
+        if (strlen($m) > $this->k) {
+            throw new \LengthException('Ciphertext representative too long');
+        }
+
+        $temp = $this->os2ip($m);
+        $temp = $this->rsadp($temp);
+        return  $this->i2osp($temp, $this->k);
+    }
+
+    /**
+     * Decryption
+     *
+     * @see self::encrypt()
+     * @param string $ciphertext
+     * @return bool|string
+     */
+    public function decrypt($ciphertext)
+    {
+        switch ($this->encryptionPadding) {
+            case self::ENCRYPTION_NONE:
+                return $this->raw_encrypt($ciphertext);
+            case self::ENCRYPTION_PKCS1:
+                return $this->rsaes_pkcs1_v1_5_decrypt($ciphertext);
+            //case self::ENCRYPTION_OAEP:
+            default:
+                return $this->rsaes_oaep_decrypt($ciphertext);
+        }
+    }
+
+    /**
+     * Returns the public key
+     *
+     * @return mixed
+     */
+    public function getPublicKey()
+    {
+        $type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey');
+        if (empty($this->modulus) || empty($this->publicExponent)) {
+            throw new \RuntimeException('Public key components not found');
+        }
+
+        $key = $type::savePublicKey($this->modulus, $this->publicExponent);
+        return RSA::loadFormat('PKCS8', $key)
+            ->withHash($this->hash->getHash())
+            ->withMGFHash($this->mgfHash->getHash())
+            ->withSaltLength($this->sLen)
+            ->withLabel($this->label)
+            ->withPadding($this->signaturePadding | $this->encryptionPadding);
+    }
+
+    /**
+     * Returns the private key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin(
+            'Keys',
+            $type,
+            empty($this->primes) ? 'savePublicKey' : 'savePrivateKey'
+        );
+
+        if ($type == PSS::class) {
+            if ($this->signaturePadding == self::SIGNATURE_PSS) {
+                $options += [
+                    'hash' => $this->hash->getHash(),
+                    'MGFHash' => $this->mgfHash->getHash(),
+                    'saltLength' => $this->getSaltLength()
+                ];
+            } else {
+                throw new UnsupportedFormatException('The PSS format can only be used when the signature method has been explicitly set to PSS');
+            }
+        }
+
+        if (empty($this->primes)) {
+            return $type::savePublicKey($this->modulus, $this->exponent, $options);
+        }
+
+        return $type::savePrivateKey($this->modulus, $this->publicExponent, $this->exponent, $this->primes, $this->exponents, $this->coefficients, $this->password, $options);
+
+        /*
+        $key = $type::savePrivateKey($this->modulus, $this->publicExponent, $this->exponent, $this->primes, $this->exponents, $this->coefficients, $this->password, $options);
+        if ($key !== false || count($this->primes) == 2) {
+            return $key;
+        }
+
+        $nSize = $this->getSize() >> 1;
+
+        $primes = [1 => clone self::$one, clone self::$one];
+        $i = 1;
+        foreach ($this->primes as $prime) {
+            $primes[$i] = $primes[$i]->multiply($prime);
+            if ($primes[$i]->getLength() >= $nSize) {
+                $i++;
+            }
+        }
+
+        $exponents = [];
+        $coefficients = [2 => $primes[2]->modInverse($primes[1])];
+
+        foreach ($primes as $i => $prime) {
+            $temp = $prime->subtract(self::$one);
+            $exponents[$i] = $this->modulus->modInverse($temp);
+        }
+
+        return $type::savePrivateKey($this->modulus, $this->publicExponent, $this->exponent, $primes, $exponents, $coefficients, $this->password, $options);
+        */
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/RSA/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,513 @@
+<?php
+
+/**
+ * RSA Public Key
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\RSA;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Crypt\RSA\Formats\Keys\PSS;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Exception\UnsupportedFormatException;
+use phpseclib3\File\ASN1;
+use phpseclib3\File\ASN1\Maps\DigestInfo;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Raw RSA Key Handler
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+final class PublicKey extends RSA implements Common\PublicKey
+{
+    use Common\Traits\Fingerprint;
+
+    /**
+     * Exponentiate
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    private function exponentiate(BigInteger $x)
+    {
+        return $x->modPow($this->exponent, $this->modulus);
+    }
+
+    /**
+     * RSAVP1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.2 RFC3447#section-5.2.2}.
+     *
+     * @param BigInteger $s
+     * @return bool|BigInteger
+     */
+    private function rsavp1($s)
+    {
+        if ($s->compare(self::$zero) < 0 || $s->compare($this->modulus) > 0) {
+            return false;
+        }
+        return $this->exponentiate($s);
+    }
+
+    /**
+     * RSASSA-PKCS1-V1_5-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.2 RFC3447#section-8.2.2}.
+     *
+     * @param string $m
+     * @param string $s
+     * @throws \LengthException if the RSA modulus is too short
+     * @return bool
+     */
+    private function rsassa_pkcs1_v1_5_verify($m, $s)
+    {
+        // Length checking
+
+        if (strlen($s) != $this->k) {
+            return false;
+        }
+
+        // RSA verification
+
+        $s = $this->os2ip($s);
+        $m2 = $this->rsavp1($s);
+        if ($m2 === false) {
+            return false;
+        }
+        $em = $this->i2osp($m2, $this->k);
+        if ($em === false) {
+            return false;
+        }
+
+        // EMSA-PKCS1-v1_5 encoding
+
+        $exception = false;
+
+        // If the encoding operation outputs "intended encoded message length too short," output "RSA modulus
+        // too short" and stop.
+        try {
+            $em2 = $this->emsa_pkcs1_v1_5_encode($m, $this->k);
+            $r1 = hash_equals($em, $em2);
+        } catch (\LengthException $e) {
+            $exception = true;
+        }
+
+        try {
+            $em3 = $this->emsa_pkcs1_v1_5_encode_without_null($m, $this->k);
+            $r2 = hash_equals($em, $em3);
+        } catch (\LengthException $e) {
+            $exception = true;
+        } catch (UnsupportedAlgorithmException $e) {
+            $r2 = false;
+        }
+
+        if ($exception) {
+            throw new \LengthException('RSA modulus too short');
+        }
+
+        // Compare
+        return $r1 || $r2;
+    }
+
+    /**
+     * RSASSA-PKCS1-V1_5-VERIFY (relaxed matching)
+     *
+     * Per {@link http://tools.ietf.org/html/rfc3447#page-43 RFC3447#page-43} PKCS1 v1.5
+     * specified the use BER encoding rather than DER encoding that PKCS1 v2.0 specified.
+     * This means that under rare conditions you can have a perfectly valid v1.5 signature
+     * that fails to validate with _rsassa_pkcs1_v1_5_verify(). PKCS1 v2.1 also recommends
+     * that if you're going to validate these types of signatures you "should indicate
+     * whether the underlying BER encoding is a DER encoding and hence whether the signature
+     * is valid with respect to the specification given in [PKCS1 v2.0+]". so if you do
+     * $rsa->getLastPadding() and get RSA::PADDING_RELAXED_PKCS1 back instead of
+     * RSA::PADDING_PKCS1... that means BER encoding was used.
+     *
+     * @param string $m
+     * @param string $s
+     * @return bool
+     */
+    private function rsassa_pkcs1_v1_5_relaxed_verify($m, $s)
+    {
+        // Length checking
+
+        if (strlen($s) != $this->k) {
+            return false;
+        }
+
+        // RSA verification
+
+        $s = $this->os2ip($s);
+        $m2 = $this->rsavp1($s);
+        if ($m2 === false) {
+            return false;
+        }
+        $em = $this->i2osp($m2, $this->k);
+        if ($em === false) {
+            return false;
+        }
+
+        if (Strings::shift($em, 2) != "\0\1") {
+            return false;
+        }
+
+        $em = ltrim($em, "\xFF");
+        if (Strings::shift($em) != "\0") {
+            return false;
+        }
+
+        $decoded = ASN1::decodeBER($em);
+        if (!is_array($decoded) || empty($decoded[0]) || strlen($em) > $decoded[0]['length']) {
+            return false;
+        }
+
+        static $oids;
+        if (!isset($oids)) {
+            $oids = [
+                'md2' => '1.2.840.113549.2.2',
+                'md4' => '1.2.840.113549.2.4', // from PKCS1 v1.5
+                'md5' => '1.2.840.113549.2.5',
+                'id-sha1' => '1.3.14.3.2.26',
+                'id-sha256' => '2.16.840.1.101.3.4.2.1',
+                'id-sha384' => '2.16.840.1.101.3.4.2.2',
+                'id-sha512' => '2.16.840.1.101.3.4.2.3',
+                // from PKCS1 v2.2
+                'id-sha224' => '2.16.840.1.101.3.4.2.4',
+                'id-sha512/224' => '2.16.840.1.101.3.4.2.5',
+                'id-sha512/256' => '2.16.840.1.101.3.4.2.6',
+            ];
+            ASN1::loadOIDs($oids);
+        }
+
+        $decoded = ASN1::asn1map($decoded[0], DigestInfo::MAP);
+        if (!isset($decoded) || $decoded === false) {
+            return false;
+        }
+
+        if (!isset($oids[$decoded['digestAlgorithm']['algorithm']])) {
+            return false;
+        }
+
+        if (isset($decoded['digestAlgorithm']['parameters']) && $decoded['digestAlgorithm']['parameters'] !== ['null' => '']) {
+            return false;
+        }
+
+        $hash = $decoded['digestAlgorithm']['algorithm'];
+        $hash = substr($hash, 0, 3) == 'id-' ?
+            substr($hash, 3) :
+            $hash;
+        $hash = new Hash($hash);
+        $em = $hash->hash($m);
+        $em2 = $decoded['digest'];
+
+        return hash_equals($em, $em2);
+    }
+
+    /**
+     * EMSA-PSS-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.2 RFC3447#section-9.1.2}.
+     *
+     * @param string $m
+     * @param string $em
+     * @param int $emBits
+     * @return string
+     */
+    private function emsa_pss_verify($m, $em, $emBits)
+    {
+        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        $emLen = ($emBits + 7) >> 3; // ie. ceil($emBits / 8);
+        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;
+
+        $mHash = $this->hash->hash($m);
+        if ($emLen < $this->hLen + $sLen + 2) {
+            return false;
+        }
+
+        if ($em[strlen($em) - 1] != chr(0xBC)) {
+            return false;
+        }
+
+        $maskedDB = substr($em, 0, -$this->hLen - 1);
+        $h = substr($em, -$this->hLen - 1, $this->hLen);
+        $temp = chr(0xFF << ($emBits & 7));
+        if ((~$maskedDB[0] & $temp) != $temp) {
+            return false;
+        }
+        $dbMask = $this->mgf1($h, $emLen - $this->hLen - 1);
+        $db = $maskedDB ^ $dbMask;
+        $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
+        $temp = $emLen - $this->hLen - $sLen - 2;
+        if (substr($db, 0, $temp) != str_repeat(chr(0), $temp) || ord($db[$temp]) != 1) {
+            return false;
+        }
+        $salt = substr($db, $temp + 1); // should be $sLen long
+        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+        $h2 = $this->hash->hash($m2);
+        return hash_equals($h, $h2);
+    }
+
+    /**
+     * RSASSA-PSS-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.2 RFC3447#section-8.1.2}.
+     *
+     * @param string $m
+     * @param string $s
+     * @return bool|string
+     */
+    private function rsassa_pss_verify($m, $s)
+    {
+        // Length checking
+
+        if (strlen($s) != $this->k) {
+            return false;
+        }
+
+        // RSA verification
+
+        $modBits = strlen($this->modulus->toBits());
+
+        $s2 = $this->os2ip($s);
+        $m2 = $this->rsavp1($s2);
+        $em = $this->i2osp($m2, $this->k);
+        if ($em === false) {
+            return false;
+        }
+
+        // EMSA-PSS verification
+
+        return $this->emsa_pss_verify($m, $em, $modBits - 1);
+    }
+
+    /**
+     * Verifies a signature
+     *
+     * @see self::sign()
+     * @param string $message
+     * @param string $signature
+     * @return bool
+     */
+    public function verify($message, $signature)
+    {
+        switch ($this->signaturePadding) {
+            case self::SIGNATURE_RELAXED_PKCS1:
+                return $this->rsassa_pkcs1_v1_5_relaxed_verify($message, $signature);
+            case self::SIGNATURE_PKCS1:
+                return $this->rsassa_pkcs1_v1_5_verify($message, $signature);
+            //case self::SIGNATURE_PSS:
+            default:
+                return $this->rsassa_pss_verify($message, $signature);
+        }
+    }
+
+    /**
+     * RSAES-PKCS1-V1_5-ENCRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.1 RFC3447#section-7.2.1}.
+     *
+     * @param string $m
+     * @param bool $pkcs15_compat optional
+     * @throws \LengthException if strlen($m) > $this->k - 11
+     * @return bool|string
+     */
+    private function rsaes_pkcs1_v1_5_encrypt($m, $pkcs15_compat = false)
+    {
+        $mLen = strlen($m);
+
+        // Length checking
+
+        if ($mLen > $this->k - 11) {
+            throw new \LengthException('Message too long');
+        }
+
+        // EME-PKCS1-v1_5 encoding
+
+        $psLen = $this->k - $mLen - 3;
+        $ps = '';
+        while (strlen($ps) != $psLen) {
+            $temp = Random::string($psLen - strlen($ps));
+            $temp = str_replace("\x00", '', $temp);
+            $ps .= $temp;
+        }
+        $type = 2;
+        $em = chr(0) . chr($type) . $ps . chr(0) . $m;
+
+        // RSA encryption
+        $m = $this->os2ip($em);
+        $c = $this->rsaep($m);
+        $c = $this->i2osp($c, $this->k);
+
+        // Output the ciphertext C
+
+        return $c;
+    }
+
+    /**
+     * RSAES-OAEP-ENCRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.1 RFC3447#section-7.1.1} and
+     * {http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding OAES}.
+     *
+     * @param string $m
+     * @throws \LengthException if strlen($m) > $this->k - 2 * $this->hLen - 2
+     * @return string
+     */
+    private function rsaes_oaep_encrypt($m)
+    {
+        $mLen = strlen($m);
+
+        // Length checking
+
+        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        if ($mLen > $this->k - 2 * $this->hLen - 2) {
+            throw new \LengthException('Message too long');
+        }
+
+        // EME-OAEP encoding
+
+        $lHash = $this->hash->hash($this->label);
+        $ps = str_repeat(chr(0), $this->k - $mLen - 2 * $this->hLen - 2);
+        $db = $lHash . $ps . chr(1) . $m;
+        $seed = Random::string($this->hLen);
+        $dbMask = $this->mgf1($seed, $this->k - $this->hLen - 1);
+        $maskedDB = $db ^ $dbMask;
+        $seedMask = $this->mgf1($maskedDB, $this->hLen);
+        $maskedSeed = $seed ^ $seedMask;
+        $em = chr(0) . $maskedSeed . $maskedDB;
+
+        // RSA encryption
+
+        $m = $this->os2ip($em);
+        $c = $this->rsaep($m);
+        $c = $this->i2osp($c, $this->k);
+
+        // Output the ciphertext C
+
+        return $c;
+    }
+
+    /**
+     * RSAEP
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.1}.
+     *
+     * @param BigInteger $m
+     * @return bool|BigInteger
+     */
+    private function rsaep($m)
+    {
+        if ($m->compare(self::$zero) < 0 || $m->compare($this->modulus) > 0) {
+            throw new \OutOfRangeException('Message representative out of range');
+        }
+        return $this->exponentiate($m);
+    }
+
+    /**
+     * Raw Encryption / Decryption
+     *
+     * Doesn't use padding and is not recommended.
+     *
+     * @param string $m
+     * @return bool|string
+     * @throws \LengthException if strlen($m) > $this->k
+     */
+    private function raw_encrypt($m)
+    {
+        if (strlen($m) > $this->k) {
+            throw new \LengthException('Message too long');
+        }
+
+        $temp = $this->os2ip($m);
+        $temp = $this->rsaep($temp);
+        return  $this->i2osp($temp, $this->k);
+    }
+
+    /**
+     * Encryption
+     *
+     * Both self::PADDING_OAEP and self::PADDING_PKCS1 both place limits on how long $plaintext can be.
+     * If $plaintext exceeds those limits it will be broken up so that it does and the resultant ciphertext's will
+     * be concatenated together.
+     *
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @return bool|string
+     * @throws \LengthException if the RSA modulus is too short
+     */
+    public function encrypt($plaintext)
+    {
+        switch ($this->encryptionPadding) {
+            case self::ENCRYPTION_NONE:
+                return $this->raw_encrypt($plaintext);
+            case self::ENCRYPTION_PKCS1:
+                return $this->rsaes_pkcs1_v1_5_encrypt($plaintext);
+            //case self::ENCRYPTION_OAEP:
+            default:
+                return $this->rsaes_oaep_encrypt($plaintext);
+        }
+    }
+
+    /**
+     * Returns the public key
+     *
+     * The public key is only returned under two circumstances - if the private key had the public key embedded within it
+     * or if the public key was set via setPublicKey().  If the currently loaded key is supposed to be the public key this
+     * function won't return it since this library, for the most part, doesn't distinguish between public and private keys.
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return mixed
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePublicKey');
+
+        if ($type == PSS::class) {
+            if ($this->signaturePadding == self::SIGNATURE_PSS) {
+                $options += [
+                    'hash' => $this->hash->getHash(),
+                    'MGFHash' => $this->mgfHash->getHash(),
+                    'saltLength' => $this->getSaltLength()
+                ];
+            } else {
+                throw new UnsupportedFormatException('The PSS format can only be used when the signature method has been explicitly set to PSS');
+            }
+        }
+
+        return $type::savePublicKey($this->modulus, $this->publicExponent, $options);
+    }
+
+    /**
+     * Converts a public key to a private key
+     *
+     * @return RSA
+     */
+    public function asPrivateKey()
+    {
+        $new = new PrivateKey();
+        $new->exponent = $this->exponent;
+        $new->modulus = $this->modulus;
+        $new->k = $this->k;
+        $new->format = $this->format;
+        return $new
+            ->withHash($this->hash->getHash())
+            ->withMGFHash($this->mgfHash->getHash())
+            ->withSaltLength($this->sLen)
+            ->withLabel($this->label)
+            ->withPadding($this->signaturePadding | $this->encryptionPadding);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,222 @@
+<?php
+
+/**
+ * Random Number Generator
+ *
+ * PHP version 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    echo bin2hex(\phpseclib3\Crypt\Random::string(8));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+/**
+ * Pure-PHP Random Number Generator
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Random
+{
+    /**
+     * Generate a random string.
+     *
+     * Although microoptimizations are generally discouraged as they impair readability this function is ripe with
+     * microoptimizations because this function has the potential of being called a huge number of times.
+     * eg. for RSA key generation.
+     *
+     * @param int $length
+     * @throws \RuntimeException if a symmetric cipher is needed but not loaded
+     * @return string
+     */
+    public static function string($length)
+    {
+        if (!$length) {
+            return '';
+        }
+
+        try {
+            return random_bytes($length);
+        } catch (\Exception $e) {
+            // random_compat will throw an Exception, which in PHP 5 does not implement Throwable
+        } catch (\Throwable $e) {
+            // If a sufficient source of randomness is unavailable, random_bytes() will throw an
+            // object that implements the Throwable interface (Exception, TypeError, Error).
+            // We don't actually need to do anything here. The string() method should just continue
+            // as normal. Note, however, that if we don't have a sufficient source of randomness for
+            // random_bytes(), most of the other calls here will fail too, so we'll end up using
+            // the PHP implementation.
+        }
+        // at this point we have no choice but to use a pure-PHP CSPRNG
+
+        // cascade entropy across multiple PHP instances by fixing the session and collecting all
+        // environmental variables, including the previous session data and the current session
+        // data.
+        //
+        // mt_rand seeds itself by looking at the PID and the time, both of which are (relatively)
+        // easy to guess at. linux uses mouse clicks, keyboard timings, etc, as entropy sources, but
+        // PHP isn't low level to be able to use those as sources and on a web server there's not likely
+        // going to be a ton of keyboard or mouse action. web servers do have one thing that we can use
+        // however, a ton of people visiting the website. obviously you don't want to base your seeding
+        // solely on parameters a potential attacker sends but (1) not everything in $_SERVER is controlled
+        // by the user and (2) this isn't just looking at the data sent by the current user - it's based
+        // on the data sent by all users. one user requests the page and a hash of their info is saved.
+        // another user visits the page and the serialization of their data is utilized along with the
+        // server environment stuff and a hash of the previous http request data (which itself utilizes
+        // a hash of the session data before that). certainly an attacker should be assumed to have
+        // full control over his own http requests. he, however, is not going to have control over
+        // everyone's http requests.
+        static $crypto = false, $v;
+        if ($crypto === false) {
+            // save old session data
+            $old_session_id = session_id();
+            $old_use_cookies = ini_get('session.use_cookies');
+            $old_session_cache_limiter = session_cache_limiter();
+            $_OLD_SESSION = isset($_SESSION) ? $_SESSION : false;
+            if ($old_session_id != '') {
+                session_write_close();
+            }
+
+            session_id(1);
+            ini_set('session.use_cookies', 0);
+            session_cache_limiter('');
+            session_start();
+
+            $v = (isset($_SERVER) ? self::safe_serialize($_SERVER) : '') .
+                 (isset($_POST) ? self::safe_serialize($_POST) : '') .
+                 (isset($_GET) ? self::safe_serialize($_GET) : '') .
+                 (isset($_COOKIE) ? self::safe_serialize($_COOKIE) : '') .
+                 // as of PHP 8.1 $GLOBALS can't be accessed by reference, which eliminates
+                 // the need for phpseclib_safe_serialize. see https://wiki.php.net/rfc/restrict_globals_usage
+                 // for more info
+                 (version_compare(PHP_VERSION, '8.1.0', '>=') ? serialize($GLOBALS) : self::safe_serialize($GLOBALS)) .
+                 self::safe_serialize($_SESSION) .
+                 self::safe_serialize($_OLD_SESSION);
+            $v = $seed = $_SESSION['seed'] = sha1($v, true);
+            if (!isset($_SESSION['count'])) {
+                $_SESSION['count'] = 0;
+            }
+            $_SESSION['count']++;
+
+            session_write_close();
+
+            // restore old session data
+            if ($old_session_id != '') {
+                session_id($old_session_id);
+                session_start();
+                ini_set('session.use_cookies', $old_use_cookies);
+                session_cache_limiter($old_session_cache_limiter);
+            } else {
+                if ($_OLD_SESSION !== false) {
+                    $_SESSION = $_OLD_SESSION;
+                    unset($_OLD_SESSION);
+                } else {
+                    unset($_SESSION);
+                }
+            }
+
+            // in SSH2 a shared secret and an exchange hash are generated through the key exchange process.
+            // the IV client to server is the hash of that "nonce" with the letter A and for the encryption key it's the letter C.
+            // if the hash doesn't produce enough a key or an IV that's long enough concat successive hashes of the
+            // original hash and the current hash. we'll be emulating that. for more info see the following URL:
+            //
+            // http://tools.ietf.org/html/rfc4253#section-7.2
+            //
+            // see the is_string($crypto) part for an example of how to expand the keys
+            $key = sha1($seed . 'A', true);
+            $iv = sha1($seed . 'C', true);
+
+            // ciphers are used as per the nist.gov link below. also, see this link:
+            //
+            // http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator#Designs_based_on_cryptographic_primitives
+            switch (true) {
+                case class_exists('\phpseclib3\Crypt\AES'):
+                    $crypto = new AES('ctr');
+                    break;
+                case class_exists('\phpseclib3\Crypt\Twofish'):
+                    $crypto = new Twofish('ctr');
+                    break;
+                case class_exists('\phpseclib3\Crypt\Blowfish'):
+                    $crypto = new Blowfish('ctr');
+                    break;
+                case class_exists('\phpseclib3\Crypt\TripleDES'):
+                    $crypto = new TripleDES('ctr');
+                    break;
+                case class_exists('\phpseclib3\Crypt\DES'):
+                    $crypto = new DES('ctr');
+                    break;
+                case class_exists('\phpseclib3\Crypt\RC4'):
+                    $crypto = new RC4();
+                    break;
+                default:
+                    throw new \RuntimeException(__CLASS__ . ' requires at least one symmetric cipher be loaded');
+            }
+
+            $crypto->setKey(substr($key, 0, $crypto->getKeyLength() >> 3));
+            $crypto->setIV(substr($iv, 0, $crypto->getBlockLength() >> 3));
+            $crypto->enableContinuousBuffer();
+        }
+
+        //return $crypto->encrypt(str_repeat("\0", $length));
+
+        // the following is based off of ANSI X9.31:
+        //
+        // http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
+        //
+        // OpenSSL uses that same standard for it's random numbers:
+        //
+        // http://www.opensource.apple.com/source/OpenSSL/OpenSSL-38/openssl/fips-1.0/rand/fips_rand.c
+        // (do a search for "ANS X9.31 A.2.4")
+        $result = '';
+        while (strlen($result) < $length) {
+            $i = $crypto->encrypt(microtime()); // strlen(microtime()) == 21
+            $r = $crypto->encrypt($i ^ $v); // strlen($v) == 20
+            $v = $crypto->encrypt($r ^ $i); // strlen($r) == 20
+            $result .= $r;
+        }
+
+        return substr($result, 0, $length);
+    }
+
+    /**
+     * Safely serialize variables
+     *
+     * If a class has a private __sleep() it'll emit a warning
+     * @return mixed
+     * @param mixed $arr
+     */
+    private static function safe_serialize(&$arr)
+    {
+        if (is_object($arr)) {
+            return '';
+        }
+        if (!is_array($arr)) {
+            return serialize($arr);
+        }
+        // prevent circular array recursion
+        if (isset($arr['__phpseclib_marker'])) {
+            return '';
+        }
+        $safearr = [];
+        $arr['__phpseclib_marker'] = true;
+        foreach (array_keys($arr) as $key) {
+            // do not recurse on the '__phpseclib_marker' key itself, for smaller memory usage
+            if ($key !== '__phpseclib_marker') {
+                $safearr[$key] = self::safe_serialize($arr[$key]);
+            }
+        }
+        unset($arr['__phpseclib_marker']);
+        return serialize($safearr);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Rijndael.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Rijndael.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Rijndael.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1036 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * Uses mcrypt, if available/possible, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * If {@link self::setBlockLength() setBlockLength()} isn't called, it'll be assumed to be 128 bits.  If
+ * {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link self::setKey() setKey()}.  ie. if the key is 128-bits, the key length will be 128-bits.  If it's
+ * 136-bits it'll be null-padded to 192-bits and 192 bits will be the key length until
+ * {@link self::setKey() setKey()} is called, again, at which point, it'll be recalculated.
+ *
+ * Not all Rijndael implementations may support 160-bits or 224-bits as the block length / key length.  mcrypt, for example,
+ * does not.  AES, itself, only supports block lengths of 128 and key lengths of 128, 192, and 256.
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 Rijndael-ammended.pdf#page=10} defines the
+ * algorithm for block lengths of 192 and 256 but not for block lengths / key lengths of 160 and 224.  Indeed, 160 and 224
+ * are first defined as valid key / block lengths in
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 Rijndael-ammended.pdf#page=44}:
+ * Extensions: Other block and Cipher Key lengths.
+ * Note: Use of 160/224-bit Keys must be explicitly set by setKeyLength(160) respectively setKeyLength(224).
+ *
+ * {@internal The variable names are the same as those in
+ * {@link http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 fips-197.pdf#page=10}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $rijndael = new \phpseclib3\Crypt\Rijndael('ctr');
+ *
+ *    $rijndael->setKey('abcdefghijklmnop');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rijndael->decrypt($rijndael->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2008 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\BlockCipher;
+use phpseclib3\Exception\BadDecryptionException;
+use phpseclib3\Exception\BadModeException;
+use phpseclib3\Exception\InconsistentSetupException;
+use phpseclib3\Exception\InsufficientSetupException;
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Rijndael extends BlockCipher
+{
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * Mcrypt is useable for 128/192/256-bit $block_size/$key_length. For 160/224 not.
+     * \phpseclib3\Crypt\Rijndael determines automatically whether mcrypt is useable
+     * or not for the current $block_size/$key_length.
+     * In case of, $cipher_name_mcrypt will be set dynamically at run time accordingly.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::engine
+     * @see self::isValidEngine()
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'rijndael-128';
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::setup()
+     * @var array
+     */
+    private $w;
+
+    /**
+     * The Inverse Key Schedule
+     *
+     * @see self::setup()
+     * @var array
+     */
+    private $dw;
+
+    /**
+     * The Block Length divided by 32
+     *
+     * {@internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4.  Exists in conjunction with $block_size
+     *    because the encryption / decryption / key schedule creation requires this number and not $block_size.  We could
+     *    derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.}
+     *
+     * @see self::setBlockLength()
+     * @var int
+     */
+    private $Nb = 4;
+
+    /**
+     * The Key Length (in bytes)
+     *
+     * {@internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
+     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
+     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.}
+     *
+     * @see self::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 16;
+
+    /**
+     * The Key Length divided by 32
+     *
+     * @see self::setKeyLength()
+     * @var int
+     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
+     */
+    private $Nk = 4;
+
+    /**
+     * The Number of Rounds
+     *
+     * {@internal The max value is 14, the min value is 10.}
+     *
+     * @var int
+     */
+    private $Nr;
+
+    /**
+     * Shift offsets
+     *
+     * @var array
+     */
+    private $c;
+
+    /**
+     * Holds the last used key- and block_size information
+     *
+     * @var array
+     */
+    private $kl;
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $mode
+     * @throws \InvalidArgumentException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        parent::__construct($mode);
+
+        if ($this->mode == self::MODE_STREAM) {
+            throw new BadModeException('Block ciphers cannot be ran in stream mode');
+        }
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 128, 160, 192, 224, and 256.
+     *
+     * Note: phpseclib extends Rijndael (and AES) for using 160- and 224-bit keys but they are officially not defined
+     *       and the most (if not all) implementations are not able using 160/224-bit keys but round/pad them up to
+     *       192/256 bits as, for example, mcrypt will do.
+     *
+     *       That said, if you want be compatible with other Rijndael and AES implementations,
+     *       you should not setKeyLength(160) or setKeyLength(224).
+     *
+     * Additional: In case of 160- and 224-bit keys, phpseclib will/can, for that reason, not use
+     *             the mcrypt php extension, even if available.
+     *             This results then in slower encryption.
+     *
+     * @throws \LengthException if the key length is invalid
+     * @param int $length
+     */
+    public function setKeyLength($length)
+    {
+        switch ($length) {
+            case 128:
+            case 160:
+            case 192:
+            case 224:
+            case 256:
+                $this->key_length = $length >> 3;
+                break;
+            default:
+                throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes 128, 160, 192, 224 or 256 bits are supported');
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Rijndael supports five different key lengths
+     *
+     * @see setKeyLength()
+     * @param string $key
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKey($key)
+    {
+        switch (strlen($key)) {
+            case 16:
+            case 20:
+            case 24:
+            case 28:
+            case 32:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 20, 24, 28 or 32 are supported');
+        }
+
+        parent::setKey($key);
+    }
+
+    /**
+     * Sets the block length
+     *
+     * Valid block lengths are 128, 160, 192, 224, and 256.
+     *
+     * @param int $length
+     */
+    public function setBlockLength($length)
+    {
+        switch ($length) {
+            case 128:
+            case 160:
+            case 192:
+            case 224:
+            case 256:
+                break;
+            default:
+                throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes 128, 160, 192, 224 or 256 bits are supported');
+        }
+
+        $this->Nb = $length >> 5;
+        $this->block_size = $length >> 3;
+        $this->changed = $this->nonIVChanged = true;
+        $this->setEngine();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        switch ($engine) {
+            case self::ENGINE_LIBSODIUM:
+                return function_exists('sodium_crypto_aead_aes256gcm_is_available') &&
+                       sodium_crypto_aead_aes256gcm_is_available() &&
+                       $this->mode == self::MODE_GCM &&
+                       $this->key_length == 32 &&
+                       $this->nonce && strlen($this->nonce) == 12 &&
+                       $this->block_size == 16;
+            case self::ENGINE_OPENSSL_GCM:
+                if (!extension_loaded('openssl')) {
+                    return false;
+                }
+                $methods = openssl_get_cipher_methods();
+                return $this->mode == self::MODE_GCM &&
+                       version_compare(PHP_VERSION, '7.1.0', '>=') &&
+                       in_array('aes-' . $this->getKeyLength() . '-gcm', $methods) &&
+                       $this->block_size == 16;
+            case self::ENGINE_OPENSSL:
+                if ($this->block_size != 16) {
+                    return false;
+                }
+                $this->cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb';
+                $this->cipher_name_openssl = 'aes-' . ($this->key_length << 3) . '-' . $this->openssl_translate_mode();
+                break;
+            case self::ENGINE_MCRYPT:
+                $this->cipher_name_mcrypt = 'rijndael-' . ($this->block_size << 3);
+                if ($this->key_length % 8) { // is it a 160/224-bit key?
+                    // mcrypt is not usable for them, only for 128/192/256-bit keys
+                    return false;
+                }
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function encryptBlock($in)
+    {
+        static $tables;
+        if (empty($tables)) {
+            $tables = &$this->getTables();
+        }
+        $t0   = $tables[0];
+        $t1   = $tables[1];
+        $t2   = $tables[2];
+        $t3   = $tables[3];
+        $sbox = $tables[4];
+
+        $state = [];
+        $words = unpack('N*', $in);
+
+        $c = $this->c;
+        $w = $this->w;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+
+        // addRoundKey
+        $wc = $Nb - 1;
+        foreach ($words as $word) {
+            $state[] = $word ^ $w[++$wc];
+        }
+
+        // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
+        // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding
+        // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf.
+        // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization.
+        // Unfortunately, the description given there is not quite correct.  Per aes.spec.v316.pdf#page=19 [1],
+        // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well.
+
+        // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
+        $temp = [];
+        for ($round = 1; $round < $Nr; ++$round) {
+            $i = 0; // $c[0] == 0
+            $j = $c[1];
+            $k = $c[2];
+            $l = $c[3];
+
+            while ($i < $Nb) {
+                $temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^
+                            $t1[$state[$j] >> 16 & 0x000000FF] ^
+                            $t2[$state[$k] >>  8 & 0x000000FF] ^
+                            $t3[$state[$l]       & 0x000000FF] ^
+                            $w[++$wc];
+                ++$i;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+            $state = $temp;
+        }
+
+        // subWord
+        for ($i = 0; $i < $Nb; ++$i) {
+            $state[$i] =   $sbox[$state[$i]       & 0x000000FF]        |
+                          ($sbox[$state[$i] >>  8 & 0x000000FF] <<  8) |
+                          ($sbox[$state[$i] >> 16 & 0x000000FF] << 16) |
+                          ($sbox[$state[$i] >> 24 & 0x000000FF] << 24);
+        }
+
+        // shiftRows + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $c[1];
+        $k = $c[2];
+        $l = $c[3];
+        while ($i < $Nb) {
+            $temp[$i] = ($state[$i] & intval(0xFF000000)) ^
+                        ($state[$j] & 0x00FF0000) ^
+                        ($state[$k] & 0x0000FF00) ^
+                        ($state[$l] & 0x000000FF) ^
+                         $w[$i];
+            ++$i;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+
+        return pack('N*', ...$temp);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function decryptBlock($in)
+    {
+        static $invtables;
+        if (empty($invtables)) {
+            $invtables = &$this->getInvTables();
+        }
+        $dt0   = $invtables[0];
+        $dt1   = $invtables[1];
+        $dt2   = $invtables[2];
+        $dt3   = $invtables[3];
+        $isbox = $invtables[4];
+
+        $state = [];
+        $words = unpack('N*', $in);
+
+        $c  = $this->c;
+        $dw = $this->dw;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+
+        // addRoundKey
+        $wc = $Nb - 1;
+        foreach ($words as $word) {
+            $state[] = $word ^ $dw[++$wc];
+        }
+
+        $temp = [];
+        for ($round = $Nr - 1; $round > 0; --$round) {
+            $i = 0; // $c[0] == 0
+            $j = $Nb - $c[1];
+            $k = $Nb - $c[2];
+            $l = $Nb - $c[3];
+
+            while ($i < $Nb) {
+                $temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^
+                            $dt1[$state[$j] >> 16 & 0x000000FF] ^
+                            $dt2[$state[$k] >>  8 & 0x000000FF] ^
+                            $dt3[$state[$l]       & 0x000000FF] ^
+                            $dw[++$wc];
+                ++$i;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+            $state = $temp;
+        }
+
+        // invShiftRows + invSubWord + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $Nb - $c[1];
+        $k = $Nb - $c[2];
+        $l = $Nb - $c[3];
+
+        while ($i < $Nb) {
+            $word = ($state[$i] & intval(0xFF000000)) |
+                    ($state[$j] & 0x00FF0000) |
+                    ($state[$k] & 0x0000FF00) |
+                    ($state[$l] & 0x000000FF);
+
+            $temp[$i] = $dw[$i] ^ ($isbox[$word       & 0x000000FF]        |
+                                  ($isbox[$word >>  8 & 0x000000FF] <<  8) |
+                                  ($isbox[$word >> 16 & 0x000000FF] << 16) |
+                                  ($isbox[$word >> 24 & 0x000000FF] << 24));
+            ++$i;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+
+        return pack('N*', ...$temp);
+    }
+
+    /**
+     * Setup the self::ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine and flush all $buffers
+     * Used (only) if $engine == self::ENGINE_INTERNAL
+     *
+     * _setup() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setIV()
+     *
+     * - disableContinuousBuffer()
+     *
+     * - First run of encrypt() / decrypt() with no init-settings
+     *
+     * {@internal setup() is always called before en/decryption.}
+     *
+     * {@internal Could, but not must, extend by the child Crypt_* class}
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     */
+    protected function setup()
+    {
+        if (!$this->changed) {
+            return;
+        }
+
+        parent::setup();
+
+        if (is_string($this->iv) && strlen($this->iv) != $this->block_size) {
+            throw new InconsistentSetupException('The IV length (' . strlen($this->iv) . ') does not match the block size (' . $this->block_size . ')');
+        }
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey()
+     */
+    protected function setupKey()
+    {
+        // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field.
+        // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
+        static $rcon;
+
+        if (!isset($rcon)) {
+            $rcon = [0,
+                0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
+                0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
+                0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
+                0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
+                0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
+                0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
+            ];
+            $rcon = array_map('intval', $rcon);
+        }
+
+        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->key_length === $this->kl['key_length'] && $this->block_size === $this->kl['block_size']) {
+            // already expanded
+            return;
+        }
+        $this->kl = ['key' => $this->key, 'key_length' => $this->key_length, 'block_size' => $this->block_size];
+
+        $this->Nk = $this->key_length >> 2;
+        // see Rijndael-ammended.pdf#page=44
+        $this->Nr = max($this->Nk, $this->Nb) + 6;
+
+        // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44,
+        //     "Table 8: Shift offsets in Shiftrow for the alternative block lengths"
+        // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14,
+        //     "Table 2: Shift offsets for different block lengths"
+        switch ($this->Nb) {
+            case 4:
+            case 5:
+            case 6:
+                $this->c = [0, 1, 2, 3];
+                break;
+            case 7:
+                $this->c = [0, 1, 2, 4];
+                break;
+            case 8:
+                $this->c = [0, 1, 3, 4];
+        }
+
+        $w = array_values(unpack('N*words', $this->key));
+
+        $length = $this->Nb * ($this->Nr + 1);
+        for ($i = $this->Nk; $i < $length; $i++) {
+            $temp = $w[$i - 1];
+            if ($i % $this->Nk == 0) {
+                // according to <http://php.net/language.types.integer>, "the size of an integer is platform-dependent".
+                // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine,
+                // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and'
+                // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is.
+                $temp = (($temp << 8) & intval(0xFFFFFF00)) | (($temp >> 24) & 0x000000FF); // rotWord
+                $temp = $this->subWord($temp) ^ $rcon[$i / $this->Nk];
+            } elseif ($this->Nk > 6 && $i % $this->Nk == 4) {
+                $temp = $this->subWord($temp);
+            }
+            $w[$i] = $w[$i - $this->Nk] ^ $temp;
+        }
+
+        // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns
+        // and generate the inverse key schedule.  more specifically,
+        // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> (section 5.3.3),
+        // "The key expansion for the Inverse Cipher is defined as follows:
+        //        1. Apply the Key Expansion.
+        //        2. Apply InvMixColumn to all Round Keys except the first and the last one."
+        // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
+        list($dt0, $dt1, $dt2, $dt3) = $this->getInvTables();
+        $temp = $this->w = $this->dw = [];
+        for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
+            if ($col == $this->Nb) {
+                if ($row == 0) {
+                    $this->dw[0] = $this->w[0];
+                } else {
+                    // subWord + invMixColumn + invSubWord = invMixColumn
+                    $j = 0;
+                    while ($j < $this->Nb) {
+                        $dw = $this->subWord($this->w[$row][$j]);
+                        $temp[$j] = $dt0[$dw >> 24 & 0x000000FF] ^
+                                    $dt1[$dw >> 16 & 0x000000FF] ^
+                                    $dt2[$dw >>  8 & 0x000000FF] ^
+                                    $dt3[$dw       & 0x000000FF];
+                        $j++;
+                    }
+                    $this->dw[$row] = $temp;
+                }
+
+                $col = 0;
+                $row++;
+            }
+            $this->w[$row][$col] = $w[$i];
+        }
+
+        $this->dw[$row] = $this->w[$row];
+
+        // Converting to 1-dim key arrays (both ascending)
+        $this->dw = array_reverse($this->dw);
+        $w  = array_pop($this->w);
+        $dw = array_pop($this->dw);
+        foreach ($this->w as $r => $wr) {
+            foreach ($wr as $c => $wc) {
+                $w[]  = $wc;
+                $dw[] = $this->dw[$r][$c];
+            }
+        }
+        $this->w  = $w;
+        $this->dw = $dw;
+    }
+
+    /**
+     * Performs S-Box substitutions
+     *
+     * @return array
+     * @param int $word
+     */
+    private function subWord($word)
+    {
+        static $sbox;
+        if (empty($sbox)) {
+            list(, , , , $sbox) = self::getTables();
+        }
+
+        return  $sbox[$word       & 0x000000FF]        |
+               ($sbox[$word >>  8 & 0x000000FF] <<  8) |
+               ($sbox[$word >> 16 & 0x000000FF] << 16) |
+               ($sbox[$word >> 24 & 0x000000FF] << 24);
+    }
+
+    /**
+     * Provides the mixColumns and sboxes tables
+     *
+     * @see self::encryptBlock()
+     * @see self::setupInlineCrypt()
+     * @see self::subWord()
+     * @return array &$tables
+     */
+    protected function &getTables()
+    {
+        static $tables;
+        if (empty($tables)) {
+            // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> (section 5.2.1),
+            // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so
+            // those are the names we'll use.
+            $t3 = array_map('intval', [
+                // with array_map('intval', ...) we ensure we have only int's and not
+                // some slower floats converted by php automatically on high values
+                0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491,
+                0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC,
+                0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB,
+                0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B,
+                0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83,
+                0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A,
+                0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F,
+                0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA,
+                0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B,
+                0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713,
+                0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6,
+                0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85,
+                0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411,
+                0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B,
+                0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1,
+                0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF,
+                0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E,
+                0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6,
+                0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B,
+                0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD,
+                0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8,
+                0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2,
+                0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049,
+                0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810,
+                0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197,
+                0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F,
+                0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C,
+                0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927,
+                0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733,
+                0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5,
+                0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0,
+                0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
+            ]);
+
+            foreach ($t3 as $t3i) {
+                $t0[] = (($t3i << 24) & intval(0xFF000000)) | (($t3i >>  8) & 0x00FFFFFF);
+                $t1[] = (($t3i << 16) & intval(0xFFFF0000)) | (($t3i >> 16) & 0x0000FFFF);
+                $t2[] = (($t3i <<  8) & intval(0xFFFFFF00)) | (($t3i >> 24) & 0x000000FF);
+            }
+
+            $tables = [
+                // The Precomputed mixColumns tables t0 - t3
+                $t0,
+                $t1,
+                $t2,
+                $t3,
+                // The SubByte S-Box
+                [
+                    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
+                    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
+                    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
+                    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
+                    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
+                    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
+                    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
+                    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
+                    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
+                    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
+                    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
+                    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
+                    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
+                    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
+                    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
+                    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
+                ]
+            ];
+        }
+        return $tables;
+    }
+
+    /**
+     * Provides the inverse mixColumns and inverse sboxes tables
+     *
+     * @see self::decryptBlock()
+     * @see self::setupInlineCrypt()
+     * @see self::setupKey()
+     * @return array &$tables
+     */
+    protected function &getInvTables()
+    {
+        static $tables;
+        if (empty($tables)) {
+            $dt3 = array_map('intval', [
+                0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B,
+                0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5,
+                0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B,
+                0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E,
+                0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D,
+                0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9,
+                0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66,
+                0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED,
+                0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4,
+                0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD,
+                0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60,
+                0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79,
+                0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C,
+                0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24,
+                0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C,
+                0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814,
+                0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B,
+                0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084,
+                0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077,
+                0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22,
+                0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F,
+                0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582,
+                0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB,
+                0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF,
+                0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035,
+                0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17,
+                0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46,
+                0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D,
+                0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A,
+                0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678,
+                0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF,
+                0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
+            ]);
+
+            foreach ($dt3 as $dt3i) {
+                $dt0[] = (($dt3i << 24) & intval(0xFF000000)) | (($dt3i >>  8) & 0x00FFFFFF);
+                $dt1[] = (($dt3i << 16) & intval(0xFFFF0000)) | (($dt3i >> 16) & 0x0000FFFF);
+                $dt2[] = (($dt3i <<  8) & intval(0xFFFFFF00)) | (($dt3i >> 24) & 0x000000FF);
+            };
+
+            $tables = [
+                // The Precomputed inverse mixColumns tables dt0 - dt3
+                $dt0,
+                $dt1,
+                $dt2,
+                $dt3,
+                // The inverse SubByte S-Box
+                [
+                    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
+                    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
+                    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
+                    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
+                    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
+                    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
+                    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
+                    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
+                    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
+                    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
+                    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
+                    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
+                    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
+                    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
+                    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
+                    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
+                ]
+            ];
+        }
+        return $tables;
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupInlineCrypt()
+     */
+    protected function setupInlineCrypt()
+    {
+        $w  = $this->w;
+        $dw = $this->dw;
+        $init_encrypt = '';
+        $init_decrypt = '';
+
+        $Nr = $this->Nr;
+        $Nb = $this->Nb;
+        $c  = $this->c;
+
+        // Generating encrypt code:
+        $init_encrypt .= '
+            if (empty($tables)) {
+                $tables = &$this->getTables();
+            }
+            $t0   = $tables[0];
+            $t1   = $tables[1];
+            $t2   = $tables[2];
+            $t3   = $tables[3];
+            $sbox = $tables[4];
+        ';
+
+        $s  = 'e';
+        $e  = 's';
+        $wc = $Nb - 1;
+
+        // Preround: addRoundKey
+        $encrypt_block = '$in = unpack("N*", $in);' . "\n";
+        for ($i = 0; $i < $Nb; ++$i) {
+            $encrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $w[++$wc] . ";\n";
+        }
+
+        // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
+        for ($round = 1; $round < $Nr; ++$round) {
+            list($s, $e) = [$e, $s];
+            for ($i = 0; $i < $Nb; ++$i) {
+                $encrypt_block .=
+                    '$' . $e . $i . ' =
+                    $t0[($' . $s . $i                  . ' >> 24) & 0xff] ^
+                    $t1[($' . $s . (($i + $c[1]) % $Nb) . ' >> 16) & 0xff] ^
+                    $t2[($' . $s . (($i + $c[2]) % $Nb) . ' >>  8) & 0xff] ^
+                    $t3[ $' . $s . (($i + $c[3]) % $Nb) . '        & 0xff] ^
+                    ' . $w[++$wc] . ";\n";
+            }
+        }
+
+        // Finalround: subWord + shiftRows + addRoundKey
+        for ($i = 0; $i < $Nb; ++$i) {
+            $encrypt_block .=
+                '$' . $e . $i . ' =
+                 $sbox[ $' . $e . $i . '        & 0xff]        |
+                ($sbox[($' . $e . $i . ' >>  8) & 0xff] <<  8) |
+                ($sbox[($' . $e . $i . ' >> 16) & 0xff] << 16) |
+                ($sbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n";
+        }
+        $encrypt_block .= '$in = pack("N*"' . "\n";
+        for ($i = 0; $i < $Nb; ++$i) {
+            $encrypt_block .= ',
+                ($' . $e . $i                  . ' & ' . ((int)0xFF000000) . ') ^
+                ($' . $e . (($i + $c[1]) % $Nb) . ' &         0x00FF0000   ) ^
+                ($' . $e . (($i + $c[2]) % $Nb) . ' &         0x0000FF00   ) ^
+                ($' . $e . (($i + $c[3]) % $Nb) . ' &         0x000000FF   ) ^
+                ' . $w[$i] . "\n";
+        }
+        $encrypt_block .= ');';
+
+        // Generating decrypt code:
+        $init_decrypt .= '
+            if (empty($invtables)) {
+                $invtables = &$this->getInvTables();
+            }
+            $dt0   = $invtables[0];
+            $dt1   = $invtables[1];
+            $dt2   = $invtables[2];
+            $dt3   = $invtables[3];
+            $isbox = $invtables[4];
+        ';
+
+        $s  = 'e';
+        $e  = 's';
+        $wc = $Nb - 1;
+
+        // Preround: addRoundKey
+        $decrypt_block = '$in = unpack("N*", $in);' . "\n";
+        for ($i = 0; $i < $Nb; ++$i) {
+            $decrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $dw[++$wc] . ';' . "\n";
+        }
+
+        // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
+        for ($round = 1; $round < $Nr; ++$round) {
+            list($s, $e) = [$e, $s];
+            for ($i = 0; $i < $Nb; ++$i) {
+                $decrypt_block .=
+                    '$' . $e . $i . ' =
+                    $dt0[($' . $s . $i                        . ' >> 24) & 0xff] ^
+                    $dt1[($' . $s . (($Nb + $i - $c[1]) % $Nb) . ' >> 16) & 0xff] ^
+                    $dt2[($' . $s . (($Nb + $i - $c[2]) % $Nb) . ' >>  8) & 0xff] ^
+                    $dt3[ $' . $s . (($Nb + $i - $c[3]) % $Nb) . '        & 0xff] ^
+                    ' . $dw[++$wc] . ";\n";
+            }
+        }
+
+        // Finalround: subWord + shiftRows + addRoundKey
+        for ($i = 0; $i < $Nb; ++$i) {
+            $decrypt_block .=
+                '$' . $e . $i . ' =
+                 $isbox[ $' . $e . $i . '        & 0xff]        |
+                ($isbox[($' . $e . $i . ' >>  8) & 0xff] <<  8) |
+                ($isbox[($' . $e . $i . ' >> 16) & 0xff] << 16) |
+                ($isbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n";
+        }
+        $decrypt_block .= '$in = pack("N*"' . "\n";
+        for ($i = 0; $i < $Nb; ++$i) {
+            $decrypt_block .= ',
+                ($' . $e . $i .                        ' & ' . ((int)0xFF000000) . ') ^
+                ($' . $e . (($Nb + $i - $c[1]) % $Nb) . ' &         0x00FF0000   ) ^
+                ($' . $e . (($Nb + $i - $c[2]) % $Nb) . ' &         0x0000FF00   ) ^
+                ($' . $e . (($Nb + $i - $c[3]) % $Nb) . ' &         0x000000FF   ) ^
+                ' . $dw[$i] . "\n";
+        }
+        $decrypt_block .= ');';
+
+        $this->inline_crypt = $this->createInlineCryptFunction(
+            [
+               'init_crypt'    => 'static $tables; static $invtables;',
+               'init_encrypt'  => $init_encrypt,
+               'init_decrypt'  => $init_decrypt,
+               'encrypt_block' => $encrypt_block,
+               'decrypt_block' => $decrypt_block
+            ]
+        );
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see self::decrypt()
+     * @see parent::encrypt()
+     * @param string $plaintext
+     * @return string
+     */
+    public function encrypt($plaintext)
+    {
+        $this->setup();
+
+        switch ($this->engine) {
+            case self::ENGINE_LIBSODIUM:
+                $this->newtag = sodium_crypto_aead_aes256gcm_encrypt($plaintext, $this->aad, $this->nonce, $this->key);
+                return Strings::shift($this->newtag, strlen($plaintext));
+            case self::ENGINE_OPENSSL_GCM:
+                return openssl_encrypt(
+                    $plaintext,
+                    'aes-' . $this->getKeyLength() . '-gcm',
+                    $this->key,
+                    OPENSSL_RAW_DATA,
+                    $this->nonce,
+                    $this->newtag,
+                    $this->aad
+                );
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * @see self::encrypt()
+     * @see parent::decrypt()
+     * @param string $ciphertext
+     * @return string
+     */
+    public function decrypt($ciphertext)
+    {
+        $this->setup();
+
+        switch ($this->engine) {
+            case self::ENGINE_LIBSODIUM:
+                if ($this->oldtag === false) {
+                    throw new InsufficientSetupException('Authentication Tag has not been set');
+                }
+                if (strlen($this->oldtag) != 16) {
+                    break;
+                }
+                $plaintext = sodium_crypto_aead_aes256gcm_decrypt($ciphertext . $this->oldtag, $this->aad, $this->nonce, $this->key);
+                if ($plaintext === false) {
+                    $this->oldtag = false;
+                    throw new BadDecryptionException('Error decrypting ciphertext with libsodium');
+                }
+                return $plaintext;
+            case self::ENGINE_OPENSSL_GCM:
+                if ($this->oldtag === false) {
+                    throw new InsufficientSetupException('Authentication Tag has not been set');
+                }
+                $plaintext = openssl_decrypt(
+                    $ciphertext,
+                    'aes-' . $this->getKeyLength() . '-gcm',
+                    $this->key,
+                    OPENSSL_RAW_DATA,
+                    $this->nonce,
+                    $this->oldtag,
+                    $this->aad
+                );
+                if ($plaintext === false) {
+                    $this->oldtag = false;
+                    throw new BadDecryptionException('Error decrypting ciphertext with OpenSSL');
+                }
+                return $plaintext;
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Salsa20.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Salsa20.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Salsa20.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,526 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Salsa20.
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2019 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\StreamCipher;
+use phpseclib3\Exception\BadDecryptionException;
+use phpseclib3\Exception\InsufficientSetupException;
+
+/**
+ * Pure-PHP implementation of Salsa20.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Salsa20 extends StreamCipher
+{
+    /**
+     * Part 1 of the state
+     *
+     * @var string|false
+     */
+    protected $p1 = false;
+
+    /**
+     * Part 2 of the state
+     *
+     * @var string|false
+     */
+    protected $p2 = false;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @var int
+     */
+    protected $key_length = 32; // = 256 bits
+
+    /**
+     * @see \phpseclib3\Crypt\Salsa20::crypt()
+     */
+    const ENCRYPT = 0;
+
+    /**
+     * @see \phpseclib3\Crypt\Salsa20::crypt()
+     */
+    const DECRYPT = 1;
+
+    /**
+     * Encryption buffer for continuous mode
+     *
+     * @var array
+     */
+    protected $enbuffer;
+
+    /**
+     * Decryption buffer for continuous mode
+     *
+     * @var array
+     */
+    protected $debuffer;
+
+    /**
+     * Counter
+     *
+     * @var int
+     */
+    protected $counter = 0;
+
+    /**
+     * Using Generated Poly1305 Key
+     *
+     * @var boolean
+     */
+    protected $usingGeneratedPoly1305Key = false;
+
+    /**
+     * Salsa20 uses a nonce
+     *
+     * @return bool
+     */
+    public function usesNonce()
+    {
+        return true;
+    }
+
+    /**
+     * Sets the key.
+     *
+     * @param string $key
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKey($key)
+    {
+        switch (strlen($key)) {
+            case 16:
+            case 32:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16 or 32 are supported');
+        }
+
+        parent::setKey($key);
+    }
+
+    /**
+     * Sets the nonce.
+     *
+     * @param string $nonce
+     */
+    public function setNonce($nonce)
+    {
+        if (strlen($nonce) != 8) {
+            throw new \LengthException('Nonce of size ' . strlen($key) . ' not supported by this algorithm. Only an 64-bit nonce is supported');
+        }
+
+        $this->nonce = $nonce;
+        $this->changed = true;
+        $this->setEngine();
+    }
+
+    /**
+     * Sets the counter.
+     *
+     * @param int $counter
+     */
+    public function setCounter($counter)
+    {
+        $this->counter = $counter;
+        $this->setEngine();
+    }
+
+    /**
+     * Creates a Poly1305 key using the method discussed in RFC8439
+     *
+     * See https://tools.ietf.org/html/rfc8439#section-2.6.1
+     */
+    protected function createPoly1305Key()
+    {
+        if ($this->nonce === false) {
+            throw new InsufficientSetupException('No nonce has been defined');
+        }
+
+        if ($this->key === false) {
+            throw new InsufficientSetupException('No key has been defined');
+        }
+
+        $c = clone $this;
+        $c->setCounter(0);
+        $c->usePoly1305 = false;
+        $block = $c->encrypt(str_repeat("\0", 256));
+        $this->setPoly1305Key(substr($block, 0, 32));
+
+        if ($this->counter == 0) {
+            $this->counter++;
+        }
+    }
+
+    /**
+     * Setup the self::ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine
+     *
+     * _setup() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setNonce()
+     *
+     * - First run of encrypt() / decrypt() with no init-settings
+     *
+     * @see self::setKey()
+     * @see self::setNonce()
+     * @see self::disableContinuousBuffer()
+     */
+    protected function setup()
+    {
+        if (!$this->changed) {
+            return;
+        }
+
+        $this->enbuffer = $this->debuffer = ['ciphertext' => '', 'counter' => $this->counter];
+
+        $this->changed = $this->nonIVChanged = false;
+
+        if ($this->nonce === false) {
+            throw new InsufficientSetupException('No nonce has been defined');
+        }
+
+        if ($this->key === false) {
+            throw new InsufficientSetupException('No key has been defined');
+        }
+
+        if ($this->usePoly1305 && !isset($this->poly1305Key)) {
+            $this->usingGeneratedPoly1305Key = true;
+            $this->createPoly1305Key();
+        }
+
+        $key = $this->key;
+        if (strlen($key) == 16) {
+            $constant = 'expand 16-byte k';
+            $key .= $key;
+        } else {
+            $constant = 'expand 32-byte k';
+        }
+
+        $this->p1 = substr($constant, 0, 4) .
+                    substr($key, 0, 16) .
+                    substr($constant, 4, 4) .
+                    $this->nonce .
+                    "\0\0\0\0";
+        $this->p2 = substr($constant, 8, 4) .
+                    substr($key, 16, 16) .
+                    substr($constant, 12, 4);
+    }
+
+    /**
+     * Setup the key (expansion)
+     */
+    protected function setupKey()
+    {
+        // Salsa20 does not utilize this method
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @see self::crypt()
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    public function encrypt($plaintext)
+    {
+        $ciphertext = $this->crypt($plaintext, self::ENCRYPT);
+        if (isset($this->poly1305Key)) {
+            $this->newtag = $this->poly1305($ciphertext);
+        }
+        return $ciphertext;
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
+     * At least if the continuous buffer is disabled.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @see self::crypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    public function decrypt($ciphertext)
+    {
+        if (isset($this->poly1305Key)) {
+            if ($this->oldtag === false) {
+                throw new InsufficientSetupException('Authentication Tag has not been set');
+            }
+            $newtag = $this->poly1305($ciphertext);
+            if ($this->oldtag != substr($newtag, 0, strlen($this->oldtag))) {
+                $this->oldtag = false;
+                throw new BadDecryptionException('Derived authentication tag and supplied authentication tag do not match');
+            }
+            $this->oldtag = false;
+        }
+
+        return $this->crypt($ciphertext, self::DECRYPT);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @param string $in
+     */
+    protected function encryptBlock($in)
+    {
+        // Salsa20 does not utilize this method
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @param string $in
+     */
+    protected function decryptBlock($in)
+    {
+        // Salsa20 does not utilize this method
+    }
+
+    /**
+     * Encrypts or decrypts a message.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $text
+     * @param int $mode
+     * @return string $text
+     */
+    private function crypt($text, $mode)
+    {
+        $this->setup();
+        if (!$this->continuousBuffer) {
+            if ($this->engine == self::ENGINE_OPENSSL) {
+                $iv = pack('V', $this->counter) . $this->p2;
+                return openssl_encrypt(
+                    $text,
+                    $this->cipher_name_openssl,
+                    $this->key,
+                    OPENSSL_RAW_DATA,
+                    $iv
+                );
+            }
+            $i = $this->counter;
+            $blocks = str_split($text, 64);
+            foreach ($blocks as &$block) {
+                $block ^= static::salsa20($this->p1 . pack('V', $i++) . $this->p2);
+            }
+
+            return implode('', $blocks);
+        }
+
+        if ($mode == self::ENCRYPT) {
+            $buffer = &$this->enbuffer;
+        } else {
+            $buffer = &$this->debuffer;
+        }
+        if (!strlen($buffer['ciphertext'])) {
+            $ciphertext = '';
+        } else {
+            $ciphertext = $text ^ Strings::shift($buffer['ciphertext'], strlen($text));
+            $text = substr($text, strlen($ciphertext));
+            if (!strlen($text)) {
+                return $ciphertext;
+            }
+        }
+
+        $overflow = strlen($text) % 64; // & 0x3F
+        if ($overflow) {
+            $text2 = Strings::pop($text, $overflow);
+            if ($this->engine == self::ENGINE_OPENSSL) {
+                $iv = pack('V', $buffer['counter']) . $this->p2;
+                // at this point $text should be a multiple of 64
+                $buffer['counter'] += (strlen($text) >> 6) + 1; // ie. divide by 64
+                $encrypted = openssl_encrypt(
+                    $text . str_repeat("\0", 64),
+                    $this->cipher_name_openssl,
+                    $this->key,
+                    OPENSSL_RAW_DATA,
+                    $iv
+                );
+                $temp = Strings::pop($encrypted, 64);
+            } else {
+                $blocks = str_split($text, 64);
+                if (strlen($text)) {
+                    foreach ($blocks as &$block) {
+                        $block ^= static::salsa20($this->p1 . pack('V', $buffer['counter']++) . $this->p2);
+                    }
+                }
+                $encrypted = implode('', $blocks);
+                $temp = static::salsa20($this->p1 . pack('V', $buffer['counter']++) . $this->p2);
+            }
+            $ciphertext .= $encrypted . ($text2 ^ $temp);
+            $buffer['ciphertext'] = substr($temp, $overflow);
+        } elseif (!strlen($buffer['ciphertext'])) {
+            if ($this->engine == self::ENGINE_OPENSSL) {
+                $iv = pack('V', $buffer['counter']) . $this->p2;
+                $buffer['counter'] += (strlen($text) >> 6);
+                $ciphertext .= openssl_encrypt(
+                    $text,
+                    $this->cipher_name_openssl,
+                    $this->key,
+                    OPENSSL_RAW_DATA,
+                    $iv
+                );
+            } else {
+                $blocks = str_split($text, 64);
+                foreach ($blocks as &$block) {
+                    $block ^= static::salsa20($this->p1 . pack('V', $buffer['counter']++) . $this->p2);
+                }
+                $ciphertext .= implode('', $blocks);
+            }
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * Left Rotate
+     *
+     * @param int $x
+     * @param int $n
+     * @return int
+     */
+    protected static function leftRotate($x, $n)
+    {
+        if (PHP_INT_SIZE == 8) {
+            $r1 = $x << $n;
+            $r1 &= 0xFFFFFFFF;
+            $r2 = ($x & 0xFFFFFFFF) >> (32 - $n);
+        } else {
+            $x = (int) $x;
+            $r1 = $x << $n;
+            $r2 = $x >> (32 - $n);
+            $r2 &= (1 << $n) - 1;
+        }
+        return $r1 | $r2;
+    }
+
+    /**
+     * The quarterround function
+     *
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     */
+    protected static function quarterRound(&$a, &$b, &$c, &$d)
+    {
+        $b ^= self::leftRotate($a + $d, 7);
+        $c ^= self::leftRotate($b + $a, 9);
+        $d ^= self::leftRotate($c + $b, 13);
+        $a ^= self::leftRotate($d + $c, 18);
+    }
+
+    /**
+     * The doubleround function
+     *
+     * @param int $x0 (by reference)
+     * @param int $x1 (by reference)
+     * @param int $x2 (by reference)
+     * @param int $x3 (by reference)
+     * @param int $x4 (by reference)
+     * @param int $x5 (by reference)
+     * @param int $x6 (by reference)
+     * @param int $x7 (by reference)
+     * @param int $x8 (by reference)
+     * @param int $x9 (by reference)
+     * @param int $x10 (by reference)
+     * @param int $x11 (by reference)
+     * @param int $x12 (by reference)
+     * @param int $x13 (by reference)
+     * @param int $x14 (by reference)
+     * @param int $x15 (by reference)
+     */
+    protected static function doubleRound(&$x0, &$x1, &$x2, &$x3, &$x4, &$x5, &$x6, &$x7, &$x8, &$x9, &$x10, &$x11, &$x12, &$x13, &$x14, &$x15)
+    {
+        // columnRound
+        static::quarterRound($x0, $x4, $x8, $x12);
+        static::quarterRound($x5, $x9, $x13, $x1);
+        static::quarterRound($x10, $x14, $x2, $x6);
+        static::quarterRound($x15, $x3, $x7, $x11);
+        // rowRound
+        static::quarterRound($x0, $x1, $x2, $x3);
+        static::quarterRound($x5, $x6, $x7, $x4);
+        static::quarterRound($x10, $x11, $x8, $x9);
+        static::quarterRound($x15, $x12, $x13, $x14);
+    }
+
+    /**
+     * The Salsa20 hash function function
+     *
+     * @param string $x
+     */
+    protected static function salsa20($x)
+    {
+        $z = $x = unpack('V*', $x);
+        for ($i = 0; $i < 10; $i++) {
+            static::doubleRound($z[1], $z[2], $z[3], $z[4], $z[5], $z[6], $z[7], $z[8], $z[9], $z[10], $z[11], $z[12], $z[13], $z[14], $z[15], $z[16]);
+        }
+
+        for ($i = 1; $i <= 16; $i++) {
+            $x[$i] += $z[$i];
+        }
+
+        return pack('V*', ...$x);
+    }
+
+    /**
+     * Calculates Poly1305 MAC
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @param string $ciphertext
+     * @return string
+     */
+    protected function poly1305($ciphertext)
+    {
+        if (!$this->usingGeneratedPoly1305Key) {
+            return parent::poly1305($this->aad . $ciphertext);
+        } else {
+            /*
+            sodium_crypto_aead_chacha20poly1305_encrypt does not calculate the poly1305 tag
+            the same way sodium_crypto_aead_chacha20poly1305_ietf_encrypt does. you can see
+            how the latter encrypts it in Salsa20::encrypt(). here's how the former encrypts
+            it:
+
+            $this->newtag = $this->poly1305(
+                $this->aad .
+                pack('V', strlen($this->aad)) . "\0\0\0\0" .
+                $ciphertext .
+                pack('V', strlen($ciphertext)) . "\0\0\0\0"
+            );
+
+            phpseclib opts to use the IETF construction, even when the nonce is 64-bits
+            instead of 96-bits
+            */
+            return parent::poly1305(
+                self::nullPad128($this->aad) .
+                self::nullPad128($ciphertext) .
+                pack('V', strlen($this->aad)) . "\0\0\0\0" .
+                pack('V', strlen($ciphertext)) . "\0\0\0\0"
+            );
+        }
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/TripleDES.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,436 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Triple DES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.  Operates in the EDE3 mode (encrypt-decrypt-encrypt).
+ *
+ * PHP version 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $des = new \phpseclib3\Crypt\TripleDES('ctr');
+ *
+ *    $des->setKey('abcdefghijklmnopqrstuvwx');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $des->decrypt($des->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+/**
+ * Pure-PHP implementation of Triple DES.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class TripleDES extends DES
+{
+    /**
+     * Encrypt / decrypt using inner chaining
+     *
+     * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (self::MODE_CBC3).
+     */
+    const MODE_3CBC = -2;
+
+    /**
+     * Encrypt / decrypt using outer chaining
+     *
+     * Outer chaining is used by SSH-2 and when the mode is set to \phpseclib3\Crypt\Common\BlockCipher::MODE_CBC.
+     */
+    const MODE_CBC3 = self::MODE_CBC;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see \phpseclib3\Crypt\TripleDES::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 24;
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\DES::cipher_name_mcrypt
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'tripledes';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len
+     * @var int
+     */
+    protected $cfb_init_len = 750;
+
+    /**
+     * max possible size of $key
+     *
+     * @see self::setKey()
+     * @see \phpseclib3\Crypt\DES::setKey()
+     * @var string
+     */
+    protected $key_length_max = 24;
+
+    /**
+     * Internal flag whether using self::MODE_3CBC or not
+     *
+     * @var bool
+     */
+    private $mode_3cbc;
+
+    /**
+     * The \phpseclib3\Crypt\DES objects
+     *
+     * Used only if $mode_3cbc === true
+     *
+     * @var array
+     */
+    private $des;
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt or OpenSSL extensions should be used.
+     *
+     * $mode could be:
+     *
+     * - ecb
+     *
+     * - cbc
+     *
+     * - ctr
+     *
+     * - cfb
+     *
+     * - ofb
+     *
+     * - 3cbc
+     *
+     * - cbc3 (same as cbc)
+     *
+     * @see \phpseclib3\Crypt\DES::__construct()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param string $mode
+     */
+    public function __construct($mode)
+    {
+        switch (strtolower($mode)) {
+            // In case of self::MODE_3CBC, we init as CRYPT_DES_MODE_CBC
+            // and additional flag us internally as 3CBC
+            case '3cbc':
+                parent::__construct('cbc');
+                $this->mode_3cbc = true;
+
+                // This three $des'es will do the 3CBC work (if $key > 64bits)
+                $this->des = [
+                    new DES('cbc'),
+                    new DES('cbc'),
+                    new DES('cbc'),
+                ];
+
+                // we're going to be doing the padding, ourselves, so disable it in the \phpseclib3\Crypt\DES objects
+                $this->des[0]->disablePadding();
+                $this->des[1]->disablePadding();
+                $this->des[2]->disablePadding();
+                break;
+            case 'cbc3':
+                $mode = 'cbc';
+                // fall-through
+            // If not 3CBC, we init as usual
+            default:
+                parent::__construct($mode);
+
+                if ($this->mode == self::MODE_STREAM) {
+                    throw new BadModeException('Block ciphers cannot be ran in stream mode');
+                }
+        }
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @param int $engine
+     * @return bool
+     */
+    protected function isValidEngineHelper($engine)
+    {
+        if ($engine == self::ENGINE_OPENSSL) {
+            $this->cipher_name_openssl_ecb = 'des-ede3';
+            $mode = $this->openssl_translate_mode();
+            $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode;
+        }
+
+        return parent::isValidEngineHelper($engine);
+    }
+
+    /**
+     * Sets the initialization vector.
+     *
+     * SetIV is not required when \phpseclib3\Crypt\Common\SymmetricKey::MODE_ECB is being used.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setIV()
+     * @param string $iv
+     */
+    public function setIV($iv)
+    {
+        parent::setIV($iv);
+        if ($this->mode_3cbc) {
+            $this->des[0]->setIV($iv);
+            $this->des[1]->setIV($iv);
+            $this->des[2]->setIV($iv);
+        }
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 128 and 192 bits.
+     *
+     * If you want to use a 64-bit key use DES.php
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey:setKeyLength()
+     * @throws \LengthException if the key length is invalid
+     * @param int $length
+     */
+    public function setKeyLength($length)
+    {
+        switch ($length) {
+            case 128:
+            case 192:
+                break;
+            default:
+                throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes 128 or 192 bits are supported');
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Triple DES can use 128-bit (eg. strlen($key) == 16) or 192-bit (eg. strlen($key) == 24) keys.
+     *
+     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
+     *
+     * @see \phpseclib3\Crypt\DES::setKey()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setKey()
+     * @throws \LengthException if the key length is invalid
+     * @param string $key
+     */
+    public function setKey($key)
+    {
+        if ($this->explicit_key_length !== false && strlen($key) != $this->explicit_key_length) {
+            throw new \LengthException('Key length has already been set to ' . $this->explicit_key_length . ' bytes and this key is ' . strlen($key) . ' bytes');
+        }
+
+        switch (strlen($key)) {
+            case 16:
+                $key .= substr($key, 0, 8);
+                break;
+            case 24:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16 or 24 are supported');
+        }
+
+        // copied from self::setKey()
+        $this->key = $key;
+        $this->key_length = strlen($key);
+        $this->changed = $this->nonIVChanged = true;
+        $this->setEngine();
+
+        if ($this->mode_3cbc) {
+            $this->des[0]->setKey(substr($key, 0, 8));
+            $this->des[1]->setKey(substr($key, 8, 8));
+            $this->des[2]->setKey(substr($key, 16, 8));
+        }
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::encrypt()
+     * @param string $plaintext
+     * @return string $cipertext
+     */
+    public function encrypt($plaintext)
+    {
+        // parent::en/decrypt() is able to do all the work for all modes and keylengths,
+        // except for: self::MODE_3CBC (inner chaining CBC) with a key > 64bits
+
+        // if the key is smaller then 8, do what we'd normally do
+        if ($this->mode_3cbc && strlen($this->key) > 8) {
+            return $this->des[2]->encrypt(
+                $this->des[1]->decrypt(
+                    $this->des[0]->encrypt(
+                        $this->pad($plaintext)
+                    )
+                )
+            );
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::decrypt()
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    public function decrypt($ciphertext)
+    {
+        if ($this->mode_3cbc && strlen($this->key) > 8) {
+            return $this->unpad(
+                $this->des[0]->decrypt(
+                    $this->des[1]->encrypt(
+                        $this->des[2]->decrypt(
+                            str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, "\0")
+                        )
+                    )
+                )
+            );
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+
+    /**
+     * Treat consecutive "packets" as if they are a continuous buffer.
+     *
+     * Say you have a 16-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
+     * will yield different outputs:
+     *
+     * <code>
+     *    echo $des->encrypt(substr($plaintext, 0, 8));
+     *    echo $des->encrypt(substr($plaintext, 8, 8));
+     * </code>
+     * <code>
+     *    echo $des->encrypt($plaintext);
+     * </code>
+     *
+     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
+     * another, as demonstrated with the following:
+     *
+     * <code>
+     *    $des->encrypt(substr($plaintext, 0, 8));
+     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     * <code>
+     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of the \phpseclib3\Crypt\DES() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you problems.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::enableContinuousBuffer()
+     * @see self::disableContinuousBuffer()
+     */
+    public function enableContinuousBuffer()
+    {
+        parent::enableContinuousBuffer();
+        if ($this->mode_3cbc) {
+            $this->des[0]->enableContinuousBuffer();
+            $this->des[1]->enableContinuousBuffer();
+            $this->des[2]->enableContinuousBuffer();
+        }
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::disableContinuousBuffer()
+     * @see self::enableContinuousBuffer()
+     */
+    public function disableContinuousBuffer()
+    {
+        parent::disableContinuousBuffer();
+        if ($this->mode_3cbc) {
+            $this->des[0]->disableContinuousBuffer();
+            $this->des[1]->disableContinuousBuffer();
+            $this->des[2]->disableContinuousBuffer();
+        }
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see \phpseclib3\Crypt\DES::setupKey()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey()
+     */
+    protected function setupKey()
+    {
+        switch (true) {
+            // if $key <= 64bits we configure our internal pure-php cipher engine
+            // to act as regular [1]DES, not as 3DES. mcrypt.so::tripledes does the same.
+            case strlen($this->key) <= 8:
+                $this->des_rounds = 1;
+                break;
+
+            // otherwise, if $key > 64bits, we configure our engine to work as 3DES.
+            default:
+                $this->des_rounds = 3;
+
+                // (only) if 3CBC is used we have, of course, to setup the $des[0-2] keys also separately.
+                if ($this->mode_3cbc) {
+                    $this->des[0]->setupKey();
+                    $this->des[1]->setupKey();
+                    $this->des[2]->setupKey();
+
+                    // because $des[0-2] will, now, do all the work we can return here
+                    // not need unnecessary stress parent::setupKey() with our, now unused, $key.
+                    return;
+                }
+        }
+        // setup our key
+        parent::setupKey();
+    }
+
+    /**
+     * Sets the internal crypt engine
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::setPreferredEngine()
+     * @param int $engine
+     */
+    public function setPreferredEngine($engine)
+    {
+        if ($this->mode_3cbc) {
+            $this->des[0]->setPreferredEngine($engine);
+            $this->des[1]->setPreferredEngine($engine);
+            $this->des[2]->setPreferredEngine($engine);
+        }
+
+        parent::setPreferredEngine($engine);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Crypt/Twofish.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Crypt/Twofish.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Crypt/Twofish.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,816 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Twofish.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP version 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/Twofish Wikipedia description of Twofish}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $twofish = new \phpseclib3\Crypt\Twofish('ctr');
+ *
+ *    $twofish->setKey('12345678901234567890123456789012');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $twofish->decrypt($twofish->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt;
+
+use phpseclib3\Crypt\Common\BlockCipher;
+use phpseclib3\Exception\BadModeException;
+
+/**
+ * Pure-PHP implementation of Twofish.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ */
+class Twofish extends BlockCipher
+{
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt
+     * @var string
+     */
+    protected $cipher_name_mcrypt = 'twofish';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::cfb_init_len
+     * @var int
+     */
+    protected $cfb_init_len = 800;
+
+    /**
+     * Q-Table
+     *
+     * @var array
+     */
+    private static $q0 = [
+        0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76,
+        0x9A, 0x92, 0x80, 0x78, 0xE4, 0xDD, 0xD1, 0x38,
+        0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
+        0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48,
+        0xF2, 0xD0, 0x8B, 0x30, 0x84, 0x54, 0xDF, 0x23,
+        0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
+        0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C,
+        0xA6, 0xEB, 0xA5, 0xBE, 0x16, 0x0C, 0xE3, 0x61,
+        0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
+        0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1,
+        0xE1, 0xE6, 0xBD, 0x45, 0xE2, 0xF4, 0xB6, 0x66,
+        0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
+        0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA,
+        0xEA, 0x77, 0x39, 0xAF, 0x33, 0xC9, 0x62, 0x71,
+        0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
+        0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7,
+        0xA1, 0x1D, 0xAA, 0xED, 0x06, 0x70, 0xB2, 0xD2,
+        0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
+        0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB,
+        0x9E, 0x9C, 0x52, 0x1B, 0x5F, 0x93, 0x0A, 0xEF,
+        0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
+        0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64,
+        0x2A, 0xCE, 0xCB, 0x2F, 0xFC, 0x97, 0x05, 0x7A,
+        0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
+        0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02,
+        0xB8, 0xDA, 0xB0, 0x17, 0x55, 0x1F, 0x8A, 0x7D,
+        0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
+        0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,
+        0x6E, 0x50, 0xDE, 0x68, 0x65, 0xBC, 0xDB, 0xF8,
+        0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
+        0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00,
+        0x6F, 0x9D, 0x36, 0x42, 0x4A, 0x5E, 0xC1, 0xE0
+    ];
+
+    /**
+     * Q-Table
+     *
+     * @var array
+     */
+    private static $q1 = [
+        0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8,
+        0x4A, 0xD3, 0xE6, 0x6B, 0x45, 0x7D, 0xE8, 0x4B,
+        0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
+        0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F,
+        0x5E, 0xBA, 0xAE, 0x5B, 0x8A, 0x00, 0xBC, 0x9D,
+        0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
+        0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3,
+        0xB2, 0x73, 0x4C, 0x54, 0x92, 0x74, 0x36, 0x51,
+        0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
+        0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C,
+        0x13, 0x95, 0x9C, 0xC7, 0x24, 0x46, 0x3B, 0x70,
+        0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
+        0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC,
+        0x03, 0x6F, 0x08, 0xBF, 0x40, 0xE7, 0x2B, 0xE2,
+        0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
+        0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17,
+        0x66, 0x94, 0xA1, 0x1D, 0x3D, 0xF0, 0xDE, 0xB3,
+        0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
+        0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49,
+        0x81, 0x88, 0xEE, 0x21, 0xC4, 0x1A, 0xEB, 0xD9,
+        0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
+        0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48,
+        0x4F, 0xF2, 0x65, 0x8E, 0x78, 0x5C, 0x58, 0x19,
+        0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
+        0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5,
+        0xCE, 0xE9, 0x68, 0x44, 0xE0, 0x4D, 0x43, 0x69,
+        0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
+        0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC,
+        0x22, 0xC9, 0xC0, 0x9B, 0x89, 0xD4, 0xED, 0xAB,
+        0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
+        0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2,
+        0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xBE, 0x91
+    ];
+
+    /**
+     * M-Table
+     *
+     * @var array
+     */
+    private static $m0 = [
+        0xBCBC3275, 0xECEC21F3, 0x202043C6, 0xB3B3C9F4, 0xDADA03DB, 0x02028B7B, 0xE2E22BFB, 0x9E9EFAC8,
+        0xC9C9EC4A, 0xD4D409D3, 0x18186BE6, 0x1E1E9F6B, 0x98980E45, 0xB2B2387D, 0xA6A6D2E8, 0x2626B74B,
+        0x3C3C57D6, 0x93938A32, 0x8282EED8, 0x525298FD, 0x7B7BD437, 0xBBBB3771, 0x5B5B97F1, 0x474783E1,
+        0x24243C30, 0x5151E20F, 0xBABAC6F8, 0x4A4AF31B, 0xBFBF4887, 0x0D0D70FA, 0xB0B0B306, 0x7575DE3F,
+        0xD2D2FD5E, 0x7D7D20BA, 0x666631AE, 0x3A3AA35B, 0x59591C8A, 0x00000000, 0xCDCD93BC, 0x1A1AE09D,
+        0xAEAE2C6D, 0x7F7FABC1, 0x2B2BC7B1, 0xBEBEB90E, 0xE0E0A080, 0x8A8A105D, 0x3B3B52D2, 0x6464BAD5,
+        0xD8D888A0, 0xE7E7A584, 0x5F5FE807, 0x1B1B1114, 0x2C2CC2B5, 0xFCFCB490, 0x3131272C, 0x808065A3,
+        0x73732AB2, 0x0C0C8173, 0x79795F4C, 0x6B6B4154, 0x4B4B0292, 0x53536974, 0x94948F36, 0x83831F51,
+        0x2A2A3638, 0xC4C49CB0, 0x2222C8BD, 0xD5D5F85A, 0xBDBDC3FC, 0x48487860, 0xFFFFCE62, 0x4C4C0796,
+        0x4141776C, 0xC7C7E642, 0xEBEB24F7, 0x1C1C1410, 0x5D5D637C, 0x36362228, 0x6767C027, 0xE9E9AF8C,
+        0x4444F913, 0x1414EA95, 0xF5F5BB9C, 0xCFCF18C7, 0x3F3F2D24, 0xC0C0E346, 0x7272DB3B, 0x54546C70,
+        0x29294CCA, 0xF0F035E3, 0x0808FE85, 0xC6C617CB, 0xF3F34F11, 0x8C8CE4D0, 0xA4A45993, 0xCACA96B8,
+        0x68683BA6, 0xB8B84D83, 0x38382820, 0xE5E52EFF, 0xADAD569F, 0x0B0B8477, 0xC8C81DC3, 0x9999FFCC,
+        0x5858ED03, 0x19199A6F, 0x0E0E0A08, 0x95957EBF, 0x70705040, 0xF7F730E7, 0x6E6ECF2B, 0x1F1F6EE2,
+        0xB5B53D79, 0x09090F0C, 0x616134AA, 0x57571682, 0x9F9F0B41, 0x9D9D803A, 0x111164EA, 0x2525CDB9,
+        0xAFAFDDE4, 0x4545089A, 0xDFDF8DA4, 0xA3A35C97, 0xEAEAD57E, 0x353558DA, 0xEDEDD07A, 0x4343FC17,
+        0xF8F8CB66, 0xFBFBB194, 0x3737D3A1, 0xFAFA401D, 0xC2C2683D, 0xB4B4CCF0, 0x32325DDE, 0x9C9C71B3,
+        0x5656E70B, 0xE3E3DA72, 0x878760A7, 0x15151B1C, 0xF9F93AEF, 0x6363BFD1, 0x3434A953, 0x9A9A853E,
+        0xB1B1428F, 0x7C7CD133, 0x88889B26, 0x3D3DA65F, 0xA1A1D7EC, 0xE4E4DF76, 0x8181942A, 0x91910149,
+        0x0F0FFB81, 0xEEEEAA88, 0x161661EE, 0xD7D77321, 0x9797F5C4, 0xA5A5A81A, 0xFEFE3FEB, 0x6D6DB5D9,
+        0x7878AEC5, 0xC5C56D39, 0x1D1DE599, 0x7676A4CD, 0x3E3EDCAD, 0xCBCB6731, 0xB6B6478B, 0xEFEF5B01,
+        0x12121E18, 0x6060C523, 0x6A6AB0DD, 0x4D4DF61F, 0xCECEE94E, 0xDEDE7C2D, 0x55559DF9, 0x7E7E5A48,
+        0x2121B24F, 0x03037AF2, 0xA0A02665, 0x5E5E198E, 0x5A5A6678, 0x65654B5C, 0x62624E58, 0xFDFD4519,
+        0x0606F48D, 0x404086E5, 0xF2F2BE98, 0x3333AC57, 0x17179067, 0x05058E7F, 0xE8E85E05, 0x4F4F7D64,
+        0x89896AAF, 0x10109563, 0x74742FB6, 0x0A0A75FE, 0x5C5C92F5, 0x9B9B74B7, 0x2D2D333C, 0x3030D6A5,
+        0x2E2E49CE, 0x494989E9, 0x46467268, 0x77775544, 0xA8A8D8E0, 0x9696044D, 0x2828BD43, 0xA9A92969,
+        0xD9D97929, 0x8686912E, 0xD1D187AC, 0xF4F44A15, 0x8D8D1559, 0xD6D682A8, 0xB9B9BC0A, 0x42420D9E,
+        0xF6F6C16E, 0x2F2FB847, 0xDDDD06DF, 0x23233934, 0xCCCC6235, 0xF1F1C46A, 0xC1C112CF, 0x8585EBDC,
+        0x8F8F9E22, 0x7171A1C9, 0x9090F0C0, 0xAAAA539B, 0x0101F189, 0x8B8BE1D4, 0x4E4E8CED, 0x8E8E6FAB,
+        0xABABA212, 0x6F6F3EA2, 0xE6E6540D, 0xDBDBF252, 0x92927BBB, 0xB7B7B602, 0x6969CA2F, 0x3939D9A9,
+        0xD3D30CD7, 0xA7A72361, 0xA2A2AD1E, 0xC3C399B4, 0x6C6C4450, 0x07070504, 0x04047FF6, 0x272746C2,
+        0xACACA716, 0xD0D07625, 0x50501386, 0xDCDCF756, 0x84841A55, 0xE1E15109, 0x7A7A25BE, 0x1313EF91
+    ];
+
+    /**
+     * M-Table
+     *
+     * @var array
+     */
+    private static $m1 = [
+        0xA9D93939, 0x67901717, 0xB3719C9C, 0xE8D2A6A6, 0x04050707, 0xFD985252, 0xA3658080, 0x76DFE4E4,
+        0x9A084545, 0x92024B4B, 0x80A0E0E0, 0x78665A5A, 0xE4DDAFAF, 0xDDB06A6A, 0xD1BF6363, 0x38362A2A,
+        0x0D54E6E6, 0xC6432020, 0x3562CCCC, 0x98BEF2F2, 0x181E1212, 0xF724EBEB, 0xECD7A1A1, 0x6C774141,
+        0x43BD2828, 0x7532BCBC, 0x37D47B7B, 0x269B8888, 0xFA700D0D, 0x13F94444, 0x94B1FBFB, 0x485A7E7E,
+        0xF27A0303, 0xD0E48C8C, 0x8B47B6B6, 0x303C2424, 0x84A5E7E7, 0x54416B6B, 0xDF06DDDD, 0x23C56060,
+        0x1945FDFD, 0x5BA33A3A, 0x3D68C2C2, 0x59158D8D, 0xF321ECEC, 0xAE316666, 0xA23E6F6F, 0x82165757,
+        0x63951010, 0x015BEFEF, 0x834DB8B8, 0x2E918686, 0xD9B56D6D, 0x511F8383, 0x9B53AAAA, 0x7C635D5D,
+        0xA63B6868, 0xEB3FFEFE, 0xA5D63030, 0xBE257A7A, 0x16A7ACAC, 0x0C0F0909, 0xE335F0F0, 0x6123A7A7,
+        0xC0F09090, 0x8CAFE9E9, 0x3A809D9D, 0xF5925C5C, 0x73810C0C, 0x2C273131, 0x2576D0D0, 0x0BE75656,
+        0xBB7B9292, 0x4EE9CECE, 0x89F10101, 0x6B9F1E1E, 0x53A93434, 0x6AC4F1F1, 0xB499C3C3, 0xF1975B5B,
+        0xE1834747, 0xE66B1818, 0xBDC82222, 0x450E9898, 0xE26E1F1F, 0xF4C9B3B3, 0xB62F7474, 0x66CBF8F8,
+        0xCCFF9999, 0x95EA1414, 0x03ED5858, 0x56F7DCDC, 0xD4E18B8B, 0x1C1B1515, 0x1EADA2A2, 0xD70CD3D3,
+        0xFB2BE2E2, 0xC31DC8C8, 0x8E195E5E, 0xB5C22C2C, 0xE9894949, 0xCF12C1C1, 0xBF7E9595, 0xBA207D7D,
+        0xEA641111, 0x77840B0B, 0x396DC5C5, 0xAF6A8989, 0x33D17C7C, 0xC9A17171, 0x62CEFFFF, 0x7137BBBB,
+        0x81FB0F0F, 0x793DB5B5, 0x0951E1E1, 0xADDC3E3E, 0x242D3F3F, 0xCDA47676, 0xF99D5555, 0xD8EE8282,
+        0xE5864040, 0xC5AE7878, 0xB9CD2525, 0x4D049696, 0x44557777, 0x080A0E0E, 0x86135050, 0xE730F7F7,
+        0xA1D33737, 0x1D40FAFA, 0xAA346161, 0xED8C4E4E, 0x06B3B0B0, 0x706C5454, 0xB22A7373, 0xD2523B3B,
+        0x410B9F9F, 0x7B8B0202, 0xA088D8D8, 0x114FF3F3, 0x3167CBCB, 0xC2462727, 0x27C06767, 0x90B4FCFC,
+        0x20283838, 0xF67F0404, 0x60784848, 0xFF2EE5E5, 0x96074C4C, 0x5C4B6565, 0xB1C72B2B, 0xAB6F8E8E,
+        0x9E0D4242, 0x9CBBF5F5, 0x52F2DBDB, 0x1BF34A4A, 0x5FA63D3D, 0x9359A4A4, 0x0ABCB9B9, 0xEF3AF9F9,
+        0x91EF1313, 0x85FE0808, 0x49019191, 0xEE611616, 0x2D7CDEDE, 0x4FB22121, 0x8F42B1B1, 0x3BDB7272,
+        0x47B82F2F, 0x8748BFBF, 0x6D2CAEAE, 0x46E3C0C0, 0xD6573C3C, 0x3E859A9A, 0x6929A9A9, 0x647D4F4F,
+        0x2A948181, 0xCE492E2E, 0xCB17C6C6, 0x2FCA6969, 0xFCC3BDBD, 0x975CA3A3, 0x055EE8E8, 0x7AD0EDED,
+        0xAC87D1D1, 0x7F8E0505, 0xD5BA6464, 0x1AA8A5A5, 0x4BB72626, 0x0EB9BEBE, 0xA7608787, 0x5AF8D5D5,
+        0x28223636, 0x14111B1B, 0x3FDE7575, 0x2979D9D9, 0x88AAEEEE, 0x3C332D2D, 0x4C5F7979, 0x02B6B7B7,
+        0xB896CACA, 0xDA583535, 0xB09CC4C4, 0x17FC4343, 0x551A8484, 0x1FF64D4D, 0x8A1C5959, 0x7D38B2B2,
+        0x57AC3333, 0xC718CFCF, 0x8DF40606, 0x74695353, 0xB7749B9B, 0xC4F59797, 0x9F56ADAD, 0x72DAE3E3,
+        0x7ED5EAEA, 0x154AF4F4, 0x229E8F8F, 0x12A2ABAB, 0x584E6262, 0x07E85F5F, 0x99E51D1D, 0x34392323,
+        0x6EC1F6F6, 0x50446C6C, 0xDE5D3232, 0x68724646, 0x6526A0A0, 0xBC93CDCD, 0xDB03DADA, 0xF8C6BABA,
+        0xC8FA9E9E, 0xA882D6D6, 0x2BCF6E6E, 0x40507070, 0xDCEB8585, 0xFE750A0A, 0x328A9393, 0xA48DDFDF,
+        0xCA4C2929, 0x10141C1C, 0x2173D7D7, 0xF0CCB4B4, 0xD309D4D4, 0x5D108A8A, 0x0FE25151, 0x00000000,
+        0x6F9A1919, 0x9DE01A1A, 0x368F9494, 0x42E6C7C7, 0x4AECC9C9, 0x5EFDD2D2, 0xC1AB7F7F, 0xE0D8A8A8
+    ];
+
+    /**
+     * M-Table
+     *
+     * @var array
+     */
+    private static $m2 = [
+        0xBC75BC32, 0xECF3EC21, 0x20C62043, 0xB3F4B3C9, 0xDADBDA03, 0x027B028B, 0xE2FBE22B, 0x9EC89EFA,
+        0xC94AC9EC, 0xD4D3D409, 0x18E6186B, 0x1E6B1E9F, 0x9845980E, 0xB27DB238, 0xA6E8A6D2, 0x264B26B7,
+        0x3CD63C57, 0x9332938A, 0x82D882EE, 0x52FD5298, 0x7B377BD4, 0xBB71BB37, 0x5BF15B97, 0x47E14783,
+        0x2430243C, 0x510F51E2, 0xBAF8BAC6, 0x4A1B4AF3, 0xBF87BF48, 0x0DFA0D70, 0xB006B0B3, 0x753F75DE,
+        0xD25ED2FD, 0x7DBA7D20, 0x66AE6631, 0x3A5B3AA3, 0x598A591C, 0x00000000, 0xCDBCCD93, 0x1A9D1AE0,
+        0xAE6DAE2C, 0x7FC17FAB, 0x2BB12BC7, 0xBE0EBEB9, 0xE080E0A0, 0x8A5D8A10, 0x3BD23B52, 0x64D564BA,
+        0xD8A0D888, 0xE784E7A5, 0x5F075FE8, 0x1B141B11, 0x2CB52CC2, 0xFC90FCB4, 0x312C3127, 0x80A38065,
+        0x73B2732A, 0x0C730C81, 0x794C795F, 0x6B546B41, 0x4B924B02, 0x53745369, 0x9436948F, 0x8351831F,
+        0x2A382A36, 0xC4B0C49C, 0x22BD22C8, 0xD55AD5F8, 0xBDFCBDC3, 0x48604878, 0xFF62FFCE, 0x4C964C07,
+        0x416C4177, 0xC742C7E6, 0xEBF7EB24, 0x1C101C14, 0x5D7C5D63, 0x36283622, 0x672767C0, 0xE98CE9AF,
+        0x441344F9, 0x149514EA, 0xF59CF5BB, 0xCFC7CF18, 0x3F243F2D, 0xC046C0E3, 0x723B72DB, 0x5470546C,
+        0x29CA294C, 0xF0E3F035, 0x088508FE, 0xC6CBC617, 0xF311F34F, 0x8CD08CE4, 0xA493A459, 0xCAB8CA96,
+        0x68A6683B, 0xB883B84D, 0x38203828, 0xE5FFE52E, 0xAD9FAD56, 0x0B770B84, 0xC8C3C81D, 0x99CC99FF,
+        0x580358ED, 0x196F199A, 0x0E080E0A, 0x95BF957E, 0x70407050, 0xF7E7F730, 0x6E2B6ECF, 0x1FE21F6E,
+        0xB579B53D, 0x090C090F, 0x61AA6134, 0x57825716, 0x9F419F0B, 0x9D3A9D80, 0x11EA1164, 0x25B925CD,
+        0xAFE4AFDD, 0x459A4508, 0xDFA4DF8D, 0xA397A35C, 0xEA7EEAD5, 0x35DA3558, 0xED7AEDD0, 0x431743FC,
+        0xF866F8CB, 0xFB94FBB1, 0x37A137D3, 0xFA1DFA40, 0xC23DC268, 0xB4F0B4CC, 0x32DE325D, 0x9CB39C71,
+        0x560B56E7, 0xE372E3DA, 0x87A78760, 0x151C151B, 0xF9EFF93A, 0x63D163BF, 0x345334A9, 0x9A3E9A85,
+        0xB18FB142, 0x7C337CD1, 0x8826889B, 0x3D5F3DA6, 0xA1ECA1D7, 0xE476E4DF, 0x812A8194, 0x91499101,
+        0x0F810FFB, 0xEE88EEAA, 0x16EE1661, 0xD721D773, 0x97C497F5, 0xA51AA5A8, 0xFEEBFE3F, 0x6DD96DB5,
+        0x78C578AE, 0xC539C56D, 0x1D991DE5, 0x76CD76A4, 0x3EAD3EDC, 0xCB31CB67, 0xB68BB647, 0xEF01EF5B,
+        0x1218121E, 0x602360C5, 0x6ADD6AB0, 0x4D1F4DF6, 0xCE4ECEE9, 0xDE2DDE7C, 0x55F9559D, 0x7E487E5A,
+        0x214F21B2, 0x03F2037A, 0xA065A026, 0x5E8E5E19, 0x5A785A66, 0x655C654B, 0x6258624E, 0xFD19FD45,
+        0x068D06F4, 0x40E54086, 0xF298F2BE, 0x335733AC, 0x17671790, 0x057F058E, 0xE805E85E, 0x4F644F7D,
+        0x89AF896A, 0x10631095, 0x74B6742F, 0x0AFE0A75, 0x5CF55C92, 0x9BB79B74, 0x2D3C2D33, 0x30A530D6,
+        0x2ECE2E49, 0x49E94989, 0x46684672, 0x77447755, 0xA8E0A8D8, 0x964D9604, 0x284328BD, 0xA969A929,
+        0xD929D979, 0x862E8691, 0xD1ACD187, 0xF415F44A, 0x8D598D15, 0xD6A8D682, 0xB90AB9BC, 0x429E420D,
+        0xF66EF6C1, 0x2F472FB8, 0xDDDFDD06, 0x23342339, 0xCC35CC62, 0xF16AF1C4, 0xC1CFC112, 0x85DC85EB,
+        0x8F228F9E, 0x71C971A1, 0x90C090F0, 0xAA9BAA53, 0x018901F1, 0x8BD48BE1, 0x4EED4E8C, 0x8EAB8E6F,
+        0xAB12ABA2, 0x6FA26F3E, 0xE60DE654, 0xDB52DBF2, 0x92BB927B, 0xB702B7B6, 0x692F69CA, 0x39A939D9,
+        0xD3D7D30C, 0xA761A723, 0xA21EA2AD, 0xC3B4C399, 0x6C506C44, 0x07040705, 0x04F6047F, 0x27C22746,
+        0xAC16ACA7, 0xD025D076, 0x50865013, 0xDC56DCF7, 0x8455841A, 0xE109E151, 0x7ABE7A25, 0x139113EF
+    ];
+
+    /**
+     * M-Table
+     *
+     * @var array
+     */
+    private static $m3 = [
+        0xD939A9D9, 0x90176790, 0x719CB371, 0xD2A6E8D2, 0x05070405, 0x9852FD98, 0x6580A365, 0xDFE476DF,
+        0x08459A08, 0x024B9202, 0xA0E080A0, 0x665A7866, 0xDDAFE4DD, 0xB06ADDB0, 0xBF63D1BF, 0x362A3836,
+        0x54E60D54, 0x4320C643, 0x62CC3562, 0xBEF298BE, 0x1E12181E, 0x24EBF724, 0xD7A1ECD7, 0x77416C77,
+        0xBD2843BD, 0x32BC7532, 0xD47B37D4, 0x9B88269B, 0x700DFA70, 0xF94413F9, 0xB1FB94B1, 0x5A7E485A,
+        0x7A03F27A, 0xE48CD0E4, 0x47B68B47, 0x3C24303C, 0xA5E784A5, 0x416B5441, 0x06DDDF06, 0xC56023C5,
+        0x45FD1945, 0xA33A5BA3, 0x68C23D68, 0x158D5915, 0x21ECF321, 0x3166AE31, 0x3E6FA23E, 0x16578216,
+        0x95106395, 0x5BEF015B, 0x4DB8834D, 0x91862E91, 0xB56DD9B5, 0x1F83511F, 0x53AA9B53, 0x635D7C63,
+        0x3B68A63B, 0x3FFEEB3F, 0xD630A5D6, 0x257ABE25, 0xA7AC16A7, 0x0F090C0F, 0x35F0E335, 0x23A76123,
+        0xF090C0F0, 0xAFE98CAF, 0x809D3A80, 0x925CF592, 0x810C7381, 0x27312C27, 0x76D02576, 0xE7560BE7,
+        0x7B92BB7B, 0xE9CE4EE9, 0xF10189F1, 0x9F1E6B9F, 0xA93453A9, 0xC4F16AC4, 0x99C3B499, 0x975BF197,
+        0x8347E183, 0x6B18E66B, 0xC822BDC8, 0x0E98450E, 0x6E1FE26E, 0xC9B3F4C9, 0x2F74B62F, 0xCBF866CB,
+        0xFF99CCFF, 0xEA1495EA, 0xED5803ED, 0xF7DC56F7, 0xE18BD4E1, 0x1B151C1B, 0xADA21EAD, 0x0CD3D70C,
+        0x2BE2FB2B, 0x1DC8C31D, 0x195E8E19, 0xC22CB5C2, 0x8949E989, 0x12C1CF12, 0x7E95BF7E, 0x207DBA20,
+        0x6411EA64, 0x840B7784, 0x6DC5396D, 0x6A89AF6A, 0xD17C33D1, 0xA171C9A1, 0xCEFF62CE, 0x37BB7137,
+        0xFB0F81FB, 0x3DB5793D, 0x51E10951, 0xDC3EADDC, 0x2D3F242D, 0xA476CDA4, 0x9D55F99D, 0xEE82D8EE,
+        0x8640E586, 0xAE78C5AE, 0xCD25B9CD, 0x04964D04, 0x55774455, 0x0A0E080A, 0x13508613, 0x30F7E730,
+        0xD337A1D3, 0x40FA1D40, 0x3461AA34, 0x8C4EED8C, 0xB3B006B3, 0x6C54706C, 0x2A73B22A, 0x523BD252,
+        0x0B9F410B, 0x8B027B8B, 0x88D8A088, 0x4FF3114F, 0x67CB3167, 0x4627C246, 0xC06727C0, 0xB4FC90B4,
+        0x28382028, 0x7F04F67F, 0x78486078, 0x2EE5FF2E, 0x074C9607, 0x4B655C4B, 0xC72BB1C7, 0x6F8EAB6F,
+        0x0D429E0D, 0xBBF59CBB, 0xF2DB52F2, 0xF34A1BF3, 0xA63D5FA6, 0x59A49359, 0xBCB90ABC, 0x3AF9EF3A,
+        0xEF1391EF, 0xFE0885FE, 0x01914901, 0x6116EE61, 0x7CDE2D7C, 0xB2214FB2, 0x42B18F42, 0xDB723BDB,
+        0xB82F47B8, 0x48BF8748, 0x2CAE6D2C, 0xE3C046E3, 0x573CD657, 0x859A3E85, 0x29A96929, 0x7D4F647D,
+        0x94812A94, 0x492ECE49, 0x17C6CB17, 0xCA692FCA, 0xC3BDFCC3, 0x5CA3975C, 0x5EE8055E, 0xD0ED7AD0,
+        0x87D1AC87, 0x8E057F8E, 0xBA64D5BA, 0xA8A51AA8, 0xB7264BB7, 0xB9BE0EB9, 0x6087A760, 0xF8D55AF8,
+        0x22362822, 0x111B1411, 0xDE753FDE, 0x79D92979, 0xAAEE88AA, 0x332D3C33, 0x5F794C5F, 0xB6B702B6,
+        0x96CAB896, 0x5835DA58, 0x9CC4B09C, 0xFC4317FC, 0x1A84551A, 0xF64D1FF6, 0x1C598A1C, 0x38B27D38,
+        0xAC3357AC, 0x18CFC718, 0xF4068DF4, 0x69537469, 0x749BB774, 0xF597C4F5, 0x56AD9F56, 0xDAE372DA,
+        0xD5EA7ED5, 0x4AF4154A, 0x9E8F229E, 0xA2AB12A2, 0x4E62584E, 0xE85F07E8, 0xE51D99E5, 0x39233439,
+        0xC1F66EC1, 0x446C5044, 0x5D32DE5D, 0x72466872, 0x26A06526, 0x93CDBC93, 0x03DADB03, 0xC6BAF8C6,
+        0xFA9EC8FA, 0x82D6A882, 0xCF6E2BCF, 0x50704050, 0xEB85DCEB, 0x750AFE75, 0x8A93328A, 0x8DDFA48D,
+        0x4C29CA4C, 0x141C1014, 0x73D72173, 0xCCB4F0CC, 0x09D4D309, 0x108A5D10, 0xE2510FE2, 0x00000000,
+        0x9A196F9A, 0xE01A9DE0, 0x8F94368F, 0xE6C742E6, 0xECC94AEC, 0xFDD25EFD, 0xAB7FC1AB, 0xD8A8E0D8
+    ];
+
+    /**
+     * The Key Schedule Array
+     *
+     * @var array
+     */
+    private $K = [];
+
+    /**
+     * The Key depended S-Table 0
+     *
+     * @var array
+     */
+    private $S0 = [];
+
+    /**
+     * The Key depended S-Table 1
+     *
+     * @var array
+     */
+    private $S1 = [];
+
+    /**
+     * The Key depended S-Table 2
+     *
+     * @var array
+     */
+    private $S2 = [];
+
+    /**
+     * The Key depended S-Table 3
+     *
+     * @var array
+     */
+    private $S3 = [];
+
+    /**
+     * Holds the last used key
+     *
+     * @var array
+     */
+    private $kl;
+
+    /**
+     * The Key Length (in bytes)
+     *
+     * @see Crypt_Twofish::setKeyLength()
+     * @var int
+     */
+    protected $key_length = 16;
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $mode
+     * @throws BadModeException if an invalid / unsupported mode is provided
+     */
+    public function __construct($mode)
+    {
+        parent::__construct($mode);
+
+        if ($this->mode == self::MODE_STREAM) {
+            throw new BadModeException('Block ciphers cannot be ran in stream mode');
+        }
+    }
+
+    /**
+     * Initialize Static Variables
+     */
+    protected static function initialize_static_variables()
+    {
+        if (is_float(self::$m3[0])) {
+            self::$m0 = array_map('intval', self::$m0);
+            self::$m1 = array_map('intval', self::$m1);
+            self::$m2 = array_map('intval', self::$m2);
+            self::$m3 = array_map('intval', self::$m3);
+            self::$q0 = array_map('intval', self::$q0);
+            self::$q1 = array_map('intval', self::$q1);
+        }
+
+        parent::initialize_static_variables();
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 128, 192 or 256 bits
+     *
+     * @param int $length
+     */
+    public function setKeyLength($length)
+    {
+        switch ($length) {
+            case 128:
+            case 192:
+            case 256:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . $length . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported');
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Rijndael supports five different key lengths
+     *
+     * @see setKeyLength()
+     * @param string $key
+     * @throws \LengthException if the key length isn't supported
+     */
+    public function setKey($key)
+    {
+        switch (strlen($key)) {
+            case 16:
+            case 24:
+            case 32:
+                break;
+            default:
+                throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported');
+        }
+
+        parent::setKey($key);
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::_setupKey()
+     */
+    protected function setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
+            // already expanded
+            return;
+        }
+        $this->kl = ['key' => $this->key];
+
+        /* Key expanding and generating the key-depended s-boxes */
+        $le_longs = unpack('V*', $this->key);
+        $key = unpack('C*', $this->key);
+        $m0 = self::$m0;
+        $m1 = self::$m1;
+        $m2 = self::$m2;
+        $m3 = self::$m3;
+        $q0 = self::$q0;
+        $q1 = self::$q1;
+
+        $K = $S0 = $S1 = $S2 = $S3 = [];
+
+        switch (strlen($this->key)) {
+            case 16:
+                list($s7, $s6, $s5, $s4) = $this->mdsrem($le_longs[1], $le_longs[2]);
+                list($s3, $s2, $s1, $s0) = $this->mdsrem($le_longs[3], $le_longs[4]);
+                for ($i = 0, $j = 1; $i < 40; $i += 2, $j += 2) {
+                    $A = $m0[$q0[$q0[$i] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$i] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$i] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$i] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$j] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$j] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$j] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$j] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = self::safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = self::safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$i] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$i] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$i] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$i] ^ $s7] ^ $s3];
+                }
+                break;
+            case 24:
+                list($sb, $sa, $s9, $s8) = $this->mdsrem($le_longs[1], $le_longs[2]);
+                list($s7, $s6, $s5, $s4) = $this->mdsrem($le_longs[3], $le_longs[4]);
+                list($s3, $s2, $s1, $s0) = $this->mdsrem($le_longs[5], $le_longs[6]);
+                for ($i = 0, $j = 1; $i < 40; $i += 2, $j += 2) {
+                    $A = $m0[$q0[$q0[$q1[$i] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$q1[$i] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$q0[$i] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$q0[$i] ^ $key[20]] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$q1[$j] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$q1[$j] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$q0[$j] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$q0[$j] ^ $key[24]] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = self::safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = self::safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$q1[$i] ^ $s8] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$q1[$i] ^ $s9] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$q0[$i] ^ $sa] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$q0[$i] ^ $sb] ^ $s7] ^ $s3];
+                }
+                break;
+            default: // 32
+                list($sf, $se, $sd, $sc) = $this->mdsrem($le_longs[1], $le_longs[2]);
+                list($sb, $sa, $s9, $s8) = $this->mdsrem($le_longs[3], $le_longs[4]);
+                list($s7, $s6, $s5, $s4) = $this->mdsrem($le_longs[5], $le_longs[6]);
+                list($s3, $s2, $s1, $s0) = $this->mdsrem($le_longs[7], $le_longs[8]);
+                for ($i = 0, $j = 1; $i < 40; $i += 2, $j += 2) {
+                    $A = $m0[$q0[$q0[$q1[$q1[$i] ^ $key[25]] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$q1[$q0[$i] ^ $key[26]] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$q0[$q0[$i] ^ $key[27]] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$q0[$q1[$i] ^ $key[28]] ^ $key[20]] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$q1[$q1[$j] ^ $key[29]] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$q1[$q0[$j] ^ $key[30]] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$q0[$q0[$j] ^ $key[31]] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$q0[$q1[$j] ^ $key[32]] ^ $key[24]] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = self::safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = self::safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$q1[$q1[$i] ^ $sc] ^ $s8] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$q1[$q0[$i] ^ $sd] ^ $s9] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$q0[$q0[$i] ^ $se] ^ $sa] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$q0[$q1[$i] ^ $sf] ^ $sb] ^ $s7] ^ $s3];
+                }
+        }
+
+        $this->K  = $K;
+        $this->S0 = $S0;
+        $this->S1 = $S1;
+        $this->S2 = $S2;
+        $this->S3 = $S3;
+    }
+
+    /**
+     * _mdsrem function using by the twofish cipher algorithm
+     *
+     * @param string $A
+     * @param string $B
+     * @return array
+     */
+    private function mdsrem($A, $B)
+    {
+        // No gain by unrolling this loop.
+        for ($i = 0; $i < 8; ++$i) {
+            // Get most significant coefficient.
+            $t = 0xff & ($B >> 24);
+
+            // Shift the others up.
+            $B = ($B << 8) | (0xff & ($A >> 24));
+            $A <<= 8;
+
+            $u = $t << 1;
+
+            // Subtract the modular polynomial on overflow.
+            if ($t & 0x80) {
+                $u ^= 0x14d;
+            }
+
+            // Remove t * (a * x^2 + 1).
+            $B ^= $t ^ ($u << 16);
+
+            // Form u = a*t + t/a = t*(a + 1/a).
+            $u ^= 0x7fffffff & ($t >> 1);
+
+            // Add the modular polynomial on underflow.
+            if ($t & 0x01) {
+                $u ^= 0xa6 ;
+            }
+
+            // Remove t * (a + 1/a) * (x^3 + x).
+            $B ^= ($u << 24) | ($u << 8);
+        }
+
+        return [
+            0xff & $B >> 24,
+            0xff & $B >> 16,
+            0xff & $B >>  8,
+            0xff & $B];
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function encryptBlock($in)
+    {
+        $S0 = $this->S0;
+        $S1 = $this->S1;
+        $S2 = $this->S2;
+        $S3 = $this->S3;
+        $K  = $this->K;
+
+        $in = unpack("V4", $in);
+        $R0 = $K[0] ^ $in[1];
+        $R1 = $K[1] ^ $in[2];
+        $R2 = $K[2] ^ $in[3];
+        $R3 = $K[3] ^ $in[4];
+
+        $ki = 7;
+        while ($ki < 39) {
+            $t0 = $S0[ $R0        & 0xff] ^
+                  $S1[($R0 >>  8) & 0xff] ^
+                  $S2[($R0 >> 16) & 0xff] ^
+                  $S3[($R0 >> 24) & 0xff];
+            $t1 = $S0[($R1 >> 24) & 0xff] ^
+                  $S1[ $R1        & 0xff] ^
+                  $S2[($R1 >>  8) & 0xff] ^
+                  $S3[($R1 >> 16) & 0xff];
+            $R2 ^= self::safe_intval($t0 + $t1 + $K[++$ki]);
+            $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
+            $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ self::safe_intval($t0 + ($t1 << 1) + $K[++$ki]);
+
+            $t0 = $S0[ $R2        & 0xff] ^
+                  $S1[($R2 >>  8) & 0xff] ^
+                  $S2[($R2 >> 16) & 0xff] ^
+                  $S3[($R2 >> 24) & 0xff];
+            $t1 = $S0[($R3 >> 24) & 0xff] ^
+                  $S1[ $R3        & 0xff] ^
+                  $S2[($R3 >>  8) & 0xff] ^
+                  $S3[($R3 >> 16) & 0xff];
+            $R0 ^= self::safe_intval($t0 + $t1 + $K[++$ki]);
+            $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
+            $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ self::safe_intval($t0 + ($t1 << 1) + $K[++$ki]);
+        }
+
+        // @codingStandardsIgnoreStart
+        return pack("V4", $K[4] ^ $R2,
+                          $K[5] ^ $R3,
+                          $K[6] ^ $R0,
+                          $K[7] ^ $R1);
+        // @codingStandardsIgnoreEnd
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @param string $in
+     * @return string
+     */
+    protected function decryptBlock($in)
+    {
+        $S0 = $this->S0;
+        $S1 = $this->S1;
+        $S2 = $this->S2;
+        $S3 = $this->S3;
+        $K  = $this->K;
+
+        $in = unpack("V4", $in);
+        $R0 = $K[4] ^ $in[1];
+        $R1 = $K[5] ^ $in[2];
+        $R2 = $K[6] ^ $in[3];
+        $R3 = $K[7] ^ $in[4];
+
+        $ki = 40;
+        while ($ki > 8) {
+            $t0 = $S0[$R0       & 0xff] ^
+                  $S1[$R0 >>  8 & 0xff] ^
+                  $S2[$R0 >> 16 & 0xff] ^
+                  $S3[$R0 >> 24 & 0xff];
+            $t1 = $S0[$R1 >> 24 & 0xff] ^
+                  $S1[$R1       & 0xff] ^
+                  $S2[$R1 >>  8 & 0xff] ^
+                  $S3[$R1 >> 16 & 0xff];
+            $R3 ^= self::safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
+            $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
+            $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ self::safe_intval($t0 + $t1 + $K[--$ki]);
+
+            $t0 = $S0[$R2       & 0xff] ^
+                  $S1[$R2 >>  8 & 0xff] ^
+                  $S2[$R2 >> 16 & 0xff] ^
+                  $S3[$R2 >> 24 & 0xff];
+            $t1 = $S0[$R3 >> 24 & 0xff] ^
+                  $S1[$R3       & 0xff] ^
+                  $S2[$R3 >>  8 & 0xff] ^
+                  $S3[$R3 >> 16 & 0xff];
+            $R1 ^= self::safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
+            $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
+            $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ self::safe_intval($t0 + $t1 + $K[--$ki]);
+        }
+
+        // @codingStandardsIgnoreStart
+        return pack("V4", $K[0] ^ $R2,
+                          $K[1] ^ $R3,
+                          $K[2] ^ $R0,
+                          $K[3] ^ $R1);
+        // @codingStandardsIgnoreEnd
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see \phpseclib3\Crypt\Common\SymmetricKey::_setupInlineCrypt()
+     */
+    protected function setupInlineCrypt()
+    {
+        $K = $this->K;
+        $init_crypt = '
+            static $S0, $S1, $S2, $S3;
+            if (!$S0) {
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[] = (int)$this->S0[$i];
+                    $S1[] = (int)$this->S1[$i];
+                    $S2[] = (int)$this->S2[$i];
+                    $S3[] = (int)$this->S3[$i];
+                }
+            }
+        ';
+
+        $safeint = self::safe_intval_inline();
+
+        // Generating encrypt code:
+        $encrypt_block = '
+            $in = unpack("V4", $in);
+            $R0 = ' . $K[0] . ' ^ $in[1];
+            $R1 = ' . $K[1] . ' ^ $in[2];
+            $R2 = ' . $K[2] . ' ^ $in[3];
+            $R3 = ' . $K[3] . ' ^ $in[4];
+        ';
+        for ($ki = 7, $i = 0; $i < 8; ++$i) {
+            $encrypt_block .= '
+                $t0 = $S0[ $R0        & 0xff] ^
+                      $S1[($R0 >>  8) & 0xff] ^
+                      $S2[($R0 >> 16) & 0xff] ^
+                      $S3[($R0 >> 24) & 0xff];
+                $t1 = $S0[($R1 >> 24) & 0xff] ^
+                      $S1[ $R1        & 0xff] ^
+                      $S2[($R1 >>  8) & 0xff] ^
+                      $S3[($R1 >> 16) & 0xff];
+                    $R2^= ' . sprintf($safeint, '$t0 + $t1 + ' . $K[++$ki]) . ';
+                $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
+                $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';
+
+                $t0 = $S0[ $R2        & 0xff] ^
+                      $S1[($R2 >>  8) & 0xff] ^
+                      $S2[($R2 >> 16) & 0xff] ^
+                      $S3[($R2 >> 24) & 0xff];
+                $t1 = $S0[($R3 >> 24) & 0xff] ^
+                      $S1[ $R3        & 0xff] ^
+                      $S2[($R3 >>  8) & 0xff] ^
+                      $S3[($R3 >> 16) & 0xff];
+                $R0^= ' . sprintf($safeint, '($t0 + $t1 + ' . $K[++$ki] . ')') . ';
+                $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
+                $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';
+            ';
+        }
+        $encrypt_block .= '
+            $in = pack("V4", ' . $K[4] . ' ^ $R2,
+                             ' . $K[5] . ' ^ $R3,
+                             ' . $K[6] . ' ^ $R0,
+                             ' . $K[7] . ' ^ $R1);
+        ';
+
+        // Generating decrypt code:
+        $decrypt_block = '
+            $in = unpack("V4", $in);
+            $R0 = ' . $K[4] . ' ^ $in[1];
+            $R1 = ' . $K[5] . ' ^ $in[2];
+            $R2 = ' . $K[6] . ' ^ $in[3];
+            $R3 = ' . $K[7] . ' ^ $in[4];
+        ';
+        for ($ki = 40, $i = 0; $i < 8; ++$i) {
+            $decrypt_block .= '
+                $t0 = $S0[$R0       & 0xff] ^
+                      $S1[$R0 >>  8 & 0xff] ^
+                      $S2[$R0 >> 16 & 0xff] ^
+                      $S3[$R0 >> 24 & 0xff];
+                $t1 = $S0[$R1 >> 24 & 0xff] ^
+                      $S1[$R1       & 0xff] ^
+                      $S2[$R1 >>  8 & 0xff] ^
+                      $S3[$R1 >> 16 & 0xff];
+                $R3^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
+                $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
+                $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + ' . $K[--$ki] . ')') . ';
+
+                $t0 = $S0[$R2       & 0xff] ^
+                      $S1[$R2 >>  8 & 0xff] ^
+                      $S2[$R2 >> 16 & 0xff] ^
+                      $S3[$R2 >> 24 & 0xff];
+                $t1 = $S0[$R3 >> 24 & 0xff] ^
+                      $S1[$R3       & 0xff] ^
+                      $S2[$R3 >>  8 & 0xff] ^
+                      $S3[$R3 >> 16 & 0xff];
+                $R1^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
+                $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
+                $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + ' . $K[--$ki] . ')') . ';
+            ';
+        }
+        $decrypt_block .= '
+            $in = pack("V4", ' . $K[0] . ' ^ $R2,
+                             ' . $K[1] . ' ^ $R3,
+                             ' . $K[2] . ' ^ $R0,
+                             ' . $K[3] . ' ^ $R1);
+        ';
+
+        $this->inline_crypt = $this->createInlineCryptFunction(
+            [
+               'init_crypt'    => $init_crypt,
+               'init_encrypt'  => '',
+               'init_decrypt'  => '',
+               'encrypt_block' => $encrypt_block,
+               'decrypt_block' => $decrypt_block
+            ]
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/BadConfigurationException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/BadConfigurationException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/BadConfigurationException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * BadConfigurationException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * BadConfigurationException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BadConfigurationException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/BadDecryptionException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/BadDecryptionException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/BadDecryptionException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * BadDecryptionException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * BadDecryptionException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BadDecryptionException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/BadModeException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/BadModeException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/BadModeException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * BadModeException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * BadModeException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BadModeException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/ConnectionClosedException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/ConnectionClosedException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/ConnectionClosedException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * ConnectionClosedException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * ConnectionClosedException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class ConnectionClosedException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/FileNotFoundException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/FileNotFoundException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/FileNotFoundException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * FileNotFoundException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * FileNotFoundException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class FileNotFoundException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/InconsistentSetupException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/InconsistentSetupException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/InconsistentSetupException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * InconsistentSetupException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * InconsistentSetupException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class InconsistentSetupException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/InsufficientSetupException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/InsufficientSetupException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/InsufficientSetupException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * InsufficientSetupException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * InsufficientSetupException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class InsufficientSetupException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/InvalidPacketLengthException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/InvalidPacketLengthException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/InvalidPacketLengthException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,10 @@
+<?php
+
+namespace phpseclib3\Exception;
+
+/**
+ * Indicates an absent or malformed packet length header
+ */
+class InvalidPacketLengthException extends ConnectionClosedException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/NoKeyLoadedException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/NoKeyLoadedException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/NoKeyLoadedException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * NoKeyLoadedException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * NoKeyLoadedException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class NoKeyLoadedException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/NoSupportedAlgorithmsException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/NoSupportedAlgorithmsException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/NoSupportedAlgorithmsException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * NoSupportedAlgorithmsException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * NoSupportedAlgorithmsException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class NoSupportedAlgorithmsException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/TimeoutException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/TimeoutException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/TimeoutException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,10 @@
+<?php
+
+namespace phpseclib3\Exception;
+
+/**
+ * Indicates a timeout awaiting server response
+ */
+class TimeoutException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/UnableToConnectException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/UnableToConnectException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/UnableToConnectException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * UnableToConnectException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * UnableToConnectException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class UnableToConnectException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedAlgorithmException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedAlgorithmException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedAlgorithmException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * UnsupportedAlgorithmException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * UnsupportedAlgorithmException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class UnsupportedAlgorithmException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedCurveException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedCurveException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedCurveException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * UnsupportedCurveException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * UnsupportedCurveException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class UnsupportedCurveException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedFormatException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedFormatException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedFormatException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * UnsupportedFormatException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * UnsupportedFormatException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class UnsupportedFormatException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedOperationException.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedOperationException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Exception/UnsupportedOperationException.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * UnsupportedOperationException
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Exception;
+
+/**
+ * UnsupportedOperationException
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class UnsupportedOperationException extends \RuntimeException
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ANSI.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ANSI.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ANSI.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,551 @@
+<?php
+
+/**
+ * Pure-PHP ANSI Decoder
+ *
+ * PHP version 5
+ *
+ * If you call read() in \phpseclib3\Net\SSH2 you may get {@link http://en.wikipedia.org/wiki/ANSI_escape_code ANSI escape codes} back.
+ * They'd look like chr(0x1B) . '[00m' or whatever (0x1B = ESC).  They tell a
+ * {@link http://en.wikipedia.org/wiki/Terminal_emulator terminal emulator} how to format the characters, what
+ * color to display them in, etc. \phpseclib3\File\ANSI is a {@link http://en.wikipedia.org/wiki/VT100 VT100} terminal emulator.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File;
+
+/**
+ * Pure-PHP ANSI Decoder
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class ANSI
+{
+    /**
+     * Max Width
+     *
+     * @var int
+     */
+    private $max_x;
+
+    /**
+     * Max Height
+     *
+     * @var int
+     */
+    private $max_y;
+
+    /**
+     * Max History
+     *
+     * @var int
+     */
+    private $max_history;
+
+    /**
+     * History
+     *
+     * @var array
+     */
+    private $history;
+
+    /**
+     * History Attributes
+     *
+     * @var array
+     */
+    private $history_attrs;
+
+    /**
+     * Current Column
+     *
+     * @var int
+     */
+    private $x;
+
+    /**
+     * Current Row
+     *
+     * @var int
+     */
+    private $y;
+
+    /**
+     * Old Column
+     *
+     * @var int
+     */
+    private $old_x;
+
+    /**
+     * Old Row
+     *
+     * @var int
+     */
+    private $old_y;
+
+    /**
+     * An empty attribute cell
+     *
+     * @var object
+     */
+    private $base_attr_cell;
+
+    /**
+     * The current attribute cell
+     *
+     * @var object
+     */
+    private $attr_cell;
+
+    /**
+     * An empty attribute row
+     *
+     * @var array
+     */
+    private $attr_row;
+
+    /**
+     * The current screen text
+     *
+     * @var list<string>
+     */
+    private $screen;
+
+    /**
+     * The current screen attributes
+     *
+     * @var array
+     */
+    private $attrs;
+
+    /**
+     * Current ANSI code
+     *
+     * @var string
+     */
+    private $ansi;
+
+    /**
+     * Tokenization
+     *
+     * @var array
+     */
+    private $tokenization;
+
+    /**
+     * Default Constructor.
+     *
+     * @return ANSI
+     */
+    public function __construct()
+    {
+        $attr_cell = new \stdClass();
+        $attr_cell->bold = false;
+        $attr_cell->underline = false;
+        $attr_cell->blink = false;
+        $attr_cell->background = 'black';
+        $attr_cell->foreground = 'white';
+        $attr_cell->reverse = false;
+        $this->base_attr_cell = clone $attr_cell;
+        $this->attr_cell = clone $attr_cell;
+
+        $this->setHistory(200);
+        $this->setDimensions(80, 24);
+    }
+
+    /**
+     * Set terminal width and height
+     *
+     * Resets the screen as well
+     *
+     * @param int $x
+     * @param int $y
+     */
+    public function setDimensions($x, $y)
+    {
+        $this->max_x = $x - 1;
+        $this->max_y = $y - 1;
+        $this->x = $this->y = 0;
+        $this->history = $this->history_attrs = [];
+        $this->attr_row = array_fill(0, $this->max_x + 2, $this->base_attr_cell);
+        $this->screen = array_fill(0, $this->max_y + 1, '');
+        $this->attrs = array_fill(0, $this->max_y + 1, $this->attr_row);
+        $this->ansi = '';
+    }
+
+    /**
+     * Set the number of lines that should be logged past the terminal height
+     *
+     * @param int $history
+     */
+    public function setHistory($history)
+    {
+        $this->max_history = $history;
+    }
+
+    /**
+     * Load a string
+     *
+     * @param string $source
+     */
+    public function loadString($source)
+    {
+        $this->setDimensions($this->max_x + 1, $this->max_y + 1);
+        $this->appendString($source);
+    }
+
+    /**
+     * Appdend a string
+     *
+     * @param string $source
+     */
+    public function appendString($source)
+    {
+        $this->tokenization = [''];
+        for ($i = 0; $i < strlen($source); $i++) {
+            if (strlen($this->ansi)) {
+                $this->ansi .= $source[$i];
+                $chr = ord($source[$i]);
+                // http://en.wikipedia.org/wiki/ANSI_escape_code#Sequence_elements
+                // single character CSI's not currently supported
+                switch (true) {
+                    case $this->ansi == "\x1B=":
+                        $this->ansi = '';
+                        continue 2;
+                    case strlen($this->ansi) == 2 && $chr >= 64 && $chr <= 95 && $chr != ord('['):
+                    case strlen($this->ansi) > 2 && $chr >= 64 && $chr <= 126:
+                        break;
+                    default:
+                        continue 2;
+                }
+                $this->tokenization[] = $this->ansi;
+                $this->tokenization[] = '';
+                // http://ascii-table.com/ansi-escape-sequences-vt-100.php
+                switch ($this->ansi) {
+                    case "\x1B[H": // Move cursor to upper left corner
+                        $this->old_x = $this->x;
+                        $this->old_y = $this->y;
+                        $this->x = $this->y = 0;
+                        break;
+                    case "\x1B[J": // Clear screen from cursor down
+                        $this->history = array_merge($this->history, array_slice(array_splice($this->screen, $this->y + 1), 0, $this->old_y));
+                        $this->screen = array_merge($this->screen, array_fill($this->y, $this->max_y, ''));
+
+                        $this->history_attrs = array_merge($this->history_attrs, array_slice(array_splice($this->attrs, $this->y + 1), 0, $this->old_y));
+                        $this->attrs = array_merge($this->attrs, array_fill($this->y, $this->max_y, $this->attr_row));
+
+                        if (count($this->history) == $this->max_history) {
+                            array_shift($this->history);
+                            array_shift($this->history_attrs);
+                        }
+                        // fall-through
+                    case "\x1B[K": // Clear screen from cursor right
+                        $this->screen[$this->y] = substr($this->screen[$this->y], 0, $this->x);
+
+                        array_splice($this->attrs[$this->y], $this->x + 1, $this->max_x - $this->x, array_fill($this->x, $this->max_x - ($this->x - 1), $this->base_attr_cell));
+                        break;
+                    case "\x1B[2K": // Clear entire line
+                        $this->screen[$this->y] = str_repeat(' ', $this->x);
+                        $this->attrs[$this->y] = $this->attr_row;
+                        break;
+                    case "\x1B[?1h": // set cursor key to application
+                    case "\x1B[?25h": // show the cursor
+                    case "\x1B(B": // set united states g0 character set
+                        break;
+                    case "\x1BE": // Move to next line
+                        $this->newLine();
+                        $this->x = 0;
+                        break;
+                    default:
+                        switch (true) {
+                            case preg_match('#\x1B\[(\d+)B#', $this->ansi, $match): // Move cursor down n lines
+                                $this->old_y = $this->y;
+                                $this->y += (int) $match[1];
+                                break;
+                            case preg_match('#\x1B\[(\d+);(\d+)H#', $this->ansi, $match): // Move cursor to screen location v,h
+                                $this->old_x = $this->x;
+                                $this->old_y = $this->y;
+                                $this->x = $match[2] - 1;
+                                $this->y = (int) $match[1] - 1;
+                                break;
+                            case preg_match('#\x1B\[(\d+)C#', $this->ansi, $match): // Move cursor right n lines
+                                $this->old_x = $this->x;
+                                $this->x += $match[1];
+                                break;
+                            case preg_match('#\x1B\[(\d+)D#', $this->ansi, $match): // Move cursor left n lines
+                                $this->old_x = $this->x;
+                                $this->x -= $match[1];
+                                if ($this->x < 0) {
+                                    $this->x = 0;
+                                }
+                                break;
+                            case preg_match('#\x1B\[(\d+);(\d+)r#', $this->ansi, $match): // Set top and bottom lines of a window
+                                break;
+                            case preg_match('#\x1B\[(\d*(?:;\d*)*)m#', $this->ansi, $match): // character attributes
+                                $attr_cell = &$this->attr_cell;
+                                $mods = explode(';', $match[1]);
+                                foreach ($mods as $mod) {
+                                    switch ($mod) {
+                                        case '':
+                                        case '0': // Turn off character attributes
+                                            $attr_cell = clone $this->base_attr_cell;
+                                            break;
+                                        case '1': // Turn bold mode on
+                                            $attr_cell->bold = true;
+                                            break;
+                                        case '4': // Turn underline mode on
+                                            $attr_cell->underline = true;
+                                            break;
+                                        case '5': // Turn blinking mode on
+                                            $attr_cell->blink = true;
+                                            break;
+                                        case '7': // Turn reverse video on
+                                            $attr_cell->reverse = !$attr_cell->reverse;
+                                            $temp = $attr_cell->background;
+                                            $attr_cell->background = $attr_cell->foreground;
+                                            $attr_cell->foreground = $temp;
+                                            break;
+                                        default: // set colors
+                                            //$front = $attr_cell->reverse ? &$attr_cell->background : &$attr_cell->foreground;
+                                            $front = &$attr_cell->{ $attr_cell->reverse ? 'background' : 'foreground' };
+                                            //$back = $attr_cell->reverse ? &$attr_cell->foreground : &$attr_cell->background;
+                                            $back = &$attr_cell->{ $attr_cell->reverse ? 'foreground' : 'background' };
+                                            switch ($mod) {
+                                                // @codingStandardsIgnoreStart
+                                                case '30': $front = 'black'; break;
+                                                case '31': $front = 'red'; break;
+                                                case '32': $front = 'green'; break;
+                                                case '33': $front = 'yellow'; break;
+                                                case '34': $front = 'blue'; break;
+                                                case '35': $front = 'magenta'; break;
+                                                case '36': $front = 'cyan'; break;
+                                                case '37': $front = 'white'; break;
+
+                                                case '40': $back = 'black'; break;
+                                                case '41': $back = 'red'; break;
+                                                case '42': $back = 'green'; break;
+                                                case '43': $back = 'yellow'; break;
+                                                case '44': $back = 'blue'; break;
+                                                case '45': $back = 'magenta'; break;
+                                                case '46': $back = 'cyan'; break;
+                                                case '47': $back = 'white'; break;
+                                                // @codingStandardsIgnoreEnd
+
+                                                default:
+                                                    //user_error('Unsupported attribute: ' . $mod);
+                                                    $this->ansi = '';
+                                                    break 2;
+                                            }
+                                    }
+                                }
+                                break;
+                            default:
+                                //user_error("{$this->ansi} is unsupported\r\n");
+                        }
+                }
+                $this->ansi = '';
+                continue;
+            }
+
+            $this->tokenization[count($this->tokenization) - 1] .= $source[$i];
+            switch ($source[$i]) {
+                case "\r":
+                    $this->x = 0;
+                    break;
+                case "\n":
+                    $this->newLine();
+                    break;
+                case "\x08": // backspace
+                    if ($this->x) {
+                        $this->x--;
+                        $this->attrs[$this->y][$this->x] = clone $this->base_attr_cell;
+                        $this->screen[$this->y] = substr_replace(
+                            $this->screen[$this->y],
+                            $source[$i],
+                            $this->x,
+                            1
+                        );
+                    }
+                    break;
+                case "\x0F": // shift
+                    break;
+                case "\x1B": // start ANSI escape code
+                    $this->tokenization[count($this->tokenization) - 1] = substr($this->tokenization[count($this->tokenization) - 1], 0, -1);
+                    //if (!strlen($this->tokenization[count($this->tokenization) - 1])) {
+                    //    array_pop($this->tokenization);
+                    //}
+                    $this->ansi .= "\x1B";
+                    break;
+                default:
+                    $this->attrs[$this->y][$this->x] = clone $this->attr_cell;
+                    if ($this->x > strlen($this->screen[$this->y])) {
+                        $this->screen[$this->y] = str_repeat(' ', $this->x);
+                    }
+                    $this->screen[$this->y] = substr_replace(
+                        $this->screen[$this->y],
+                        $source[$i],
+                        $this->x,
+                        1
+                    );
+
+                    if ($this->x > $this->max_x) {
+                        $this->x = 0;
+                        $this->newLine();
+                    } else {
+                        $this->x++;
+                    }
+            }
+        }
+    }
+
+    /**
+     * Add a new line
+     *
+     * Also update the $this->screen and $this->history buffers
+     *
+     */
+    private function newLine()
+    {
+        //if ($this->y < $this->max_y) {
+        //    $this->y++;
+        //}
+
+        while ($this->y >= $this->max_y) {
+            $this->history = array_merge($this->history, [array_shift($this->screen)]);
+            $this->screen[] = '';
+
+            $this->history_attrs = array_merge($this->history_attrs, [array_shift($this->attrs)]);
+            $this->attrs[] = $this->attr_row;
+
+            if (count($this->history) >= $this->max_history) {
+                array_shift($this->history);
+                array_shift($this->history_attrs);
+            }
+
+            $this->y--;
+        }
+        $this->y++;
+    }
+
+    /**
+     * Returns the current coordinate without preformating
+     *
+     * @param \stdClass $last_attr
+     * @param \stdClass $cur_attr
+     * @param string $char
+     * @return string
+     */
+    private function processCoordinate(\stdClass $last_attr, \stdClass $cur_attr, $char)
+    {
+        $output = '';
+
+        if ($last_attr != $cur_attr) {
+            $close = $open = '';
+            if ($last_attr->foreground != $cur_attr->foreground) {
+                if ($cur_attr->foreground != 'white') {
+                    $open .= '<span style="color: ' . $cur_attr->foreground . '">';
+                }
+                if ($last_attr->foreground != 'white') {
+                    $close = '</span>' . $close;
+                }
+            }
+            if ($last_attr->background != $cur_attr->background) {
+                if ($cur_attr->background != 'black') {
+                    $open .= '<span style="background: ' . $cur_attr->background . '">';
+                }
+                if ($last_attr->background != 'black') {
+                    $close = '</span>' . $close;
+                }
+            }
+            if ($last_attr->bold != $cur_attr->bold) {
+                if ($cur_attr->bold) {
+                    $open .= '<b>';
+                } else {
+                    $close = '</b>' . $close;
+                }
+            }
+            if ($last_attr->underline != $cur_attr->underline) {
+                if ($cur_attr->underline) {
+                    $open .= '<u>';
+                } else {
+                    $close = '</u>' . $close;
+                }
+            }
+            if ($last_attr->blink != $cur_attr->blink) {
+                if ($cur_attr->blink) {
+                    $open .= '<blink>';
+                } else {
+                    $close = '</blink>' . $close;
+                }
+            }
+            $output .= $close . $open;
+        }
+
+        $output .= htmlspecialchars($char);
+
+        return $output;
+    }
+
+    /**
+     * Returns the current screen without preformating
+     *
+     * @return string
+     */
+    private function getScreenHelper()
+    {
+        $output = '';
+        $last_attr = $this->base_attr_cell;
+        for ($i = 0; $i <= $this->max_y; $i++) {
+            for ($j = 0; $j <= $this->max_x; $j++) {
+                $cur_attr = $this->attrs[$i][$j];
+                $output .= $this->processCoordinate($last_attr, $cur_attr, isset($this->screen[$i][$j]) ? $this->screen[$i][$j] : '');
+                $last_attr = $this->attrs[$i][$j];
+            }
+            $output .= "\r\n";
+        }
+        $output = substr($output, 0, -2);
+        // close any remaining open tags
+        $output .= $this->processCoordinate($last_attr, $this->base_attr_cell, '');
+        return rtrim($output);
+    }
+
+    /**
+     * Returns the current screen
+     *
+     * @return string
+     */
+    public function getScreen()
+    {
+        return '<pre width="' . ($this->max_x + 1) . '" style="color: white; background: black">' . $this->getScreenHelper() . '</pre>';
+    }
+
+    /**
+     * Returns the current screen and the x previous lines
+     *
+     * @return string
+     */
+    public function getHistory()
+    {
+        $scrollback = '';
+        $last_attr = $this->base_attr_cell;
+        for ($i = 0; $i < count($this->history); $i++) {
+            for ($j = 0; $j <= $this->max_x + 1; $j++) {
+                $cur_attr = $this->history_attrs[$i][$j];
+                $scrollback .= $this->processCoordinate($last_attr, $cur_attr, isset($this->history[$i][$j]) ? $this->history[$i][$j] : '');
+                $last_attr = $this->history_attrs[$i][$j];
+            }
+            $scrollback .= "\r\n";
+        }
+        $base_attr_cell = $this->base_attr_cell;
+        $this->base_attr_cell = $last_attr;
+        $scrollback .= $this->getScreen();
+        $this->base_attr_cell = $base_attr_cell;
+
+        return '<pre width="' . ($this->max_x + 1) . '" style="color: white; background: black">' . $scrollback . '</span></pre>';
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1513 @@
+<?php
+
+/**
+ * Pure-PHP ASN.1 Parser
+ *
+ * PHP version 5
+ *
+ * ASN.1 provides the semantics for data encoded using various schemes.  The most commonly
+ * utilized scheme is DER or the "Distinguished Encoding Rules".  PEM's are base64 encoded
+ * DER blobs.
+ *
+ * \phpseclib3\File\ASN1 decodes and encodes DER formatted messages and places them in a semantic context.
+ *
+ * Uses the 1988 ASN.1 syntax.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\File\ASN1\Element;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP ASN.1 Parser
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ASN1
+{
+    // Tag Classes
+    // http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=12
+    const CLASS_UNIVERSAL        = 0;
+    const CLASS_APPLICATION      = 1;
+    const CLASS_CONTEXT_SPECIFIC = 2;
+    const CLASS_PRIVATE          = 3;
+
+    // Tag Classes
+    // http://www.obj-sys.com/asn1tutorial/node124.html
+    const TYPE_BOOLEAN           = 1;
+    const TYPE_INTEGER           = 2;
+    const TYPE_BIT_STRING        = 3;
+    const TYPE_OCTET_STRING      = 4;
+    const TYPE_NULL              = 5;
+    const TYPE_OBJECT_IDENTIFIER = 6;
+    //const TYPE_OBJECT_DESCRIPTOR = 7;
+    //const TYPE_INSTANCE_OF       = 8; // EXTERNAL
+    const TYPE_REAL              = 9;
+    const TYPE_ENUMERATED        = 10;
+    //const TYPE_EMBEDDED          = 11;
+    const TYPE_UTF8_STRING       = 12;
+    //const TYPE_RELATIVE_OID      = 13;
+    const TYPE_SEQUENCE          = 16; // SEQUENCE OF
+    const TYPE_SET               = 17; // SET OF
+
+    // More Tag Classes
+    // http://www.obj-sys.com/asn1tutorial/node10.html
+    const TYPE_NUMERIC_STRING   = 18;
+    const TYPE_PRINTABLE_STRING = 19;
+    const TYPE_TELETEX_STRING   = 20; // T61String
+    const TYPE_VIDEOTEX_STRING  = 21;
+    const TYPE_IA5_STRING       = 22;
+    const TYPE_UTC_TIME         = 23;
+    const TYPE_GENERALIZED_TIME = 24;
+    const TYPE_GRAPHIC_STRING   = 25;
+    const TYPE_VISIBLE_STRING   = 26; // ISO646String
+    const TYPE_GENERAL_STRING   = 27;
+    const TYPE_UNIVERSAL_STRING = 28;
+    //const TYPE_CHARACTER_STRING = 29;
+    const TYPE_BMP_STRING       = 30;
+
+    // Tag Aliases
+    // These tags are kinda place holders for other tags.
+    const TYPE_CHOICE = -1;
+    const TYPE_ANY    = -2;
+
+    /**
+     * ASN.1 object identifiers
+     *
+     * @var array
+     * @link http://en.wikipedia.org/wiki/Object_identifier
+     */
+    private static $oids = [];
+
+    /**
+     * ASN.1 object identifier reverse mapping
+     *
+     * @var array
+     */
+    private static $reverseOIDs = [];
+
+    /**
+     * Default date format
+     *
+     * @var string
+     * @link http://php.net/class.datetime
+     */
+    private static $format = 'D, d M Y H:i:s O';
+
+    /**
+     * Filters
+     *
+     * If the mapping type is self::TYPE_ANY what do we actually encode it as?
+     *
+     * @var array
+     * @see self::encode_der()
+     */
+    private static $filters;
+
+    /**
+     * Current Location of most recent ASN.1 encode process
+     *
+     * Useful for debug purposes
+     *
+     * @var array
+     * @see self::encode_der()
+     */
+    private static $location;
+
+    /**
+     * DER Encoded String
+     *
+     * In case we need to create ASN1\Element object's..
+     *
+     * @var string
+     * @see self::decodeDER()
+     */
+    private static $encoded;
+
+    /**
+     * Type mapping table for the ANY type.
+     *
+     * Structured or unknown types are mapped to a \phpseclib3\File\ASN1\Element.
+     * Unambiguous types get the direct mapping (int/real/bool).
+     * Others are mapped as a choice, with an extra indexing level.
+     *
+     * @var array
+     */
+    const ANY_MAP = [
+        self::TYPE_BOOLEAN              => true,
+        self::TYPE_INTEGER              => true,
+        self::TYPE_BIT_STRING           => 'bitString',
+        self::TYPE_OCTET_STRING         => 'octetString',
+        self::TYPE_NULL                 => 'null',
+        self::TYPE_OBJECT_IDENTIFIER    => 'objectIdentifier',
+        self::TYPE_REAL                 => true,
+        self::TYPE_ENUMERATED           => 'enumerated',
+        self::TYPE_UTF8_STRING          => 'utf8String',
+        self::TYPE_NUMERIC_STRING       => 'numericString',
+        self::TYPE_PRINTABLE_STRING     => 'printableString',
+        self::TYPE_TELETEX_STRING       => 'teletexString',
+        self::TYPE_VIDEOTEX_STRING      => 'videotexString',
+        self::TYPE_IA5_STRING           => 'ia5String',
+        self::TYPE_UTC_TIME             => 'utcTime',
+        self::TYPE_GENERALIZED_TIME     => 'generalTime',
+        self::TYPE_GRAPHIC_STRING       => 'graphicString',
+        self::TYPE_VISIBLE_STRING       => 'visibleString',
+        self::TYPE_GENERAL_STRING       => 'generalString',
+        self::TYPE_UNIVERSAL_STRING     => 'universalString',
+        //self::TYPE_CHARACTER_STRING     => 'characterString',
+        self::TYPE_BMP_STRING           => 'bmpString'
+    ];
+
+    /**
+     * String type to character size mapping table.
+     *
+     * Non-convertable types are absent from this table.
+     * size == 0 indicates variable length encoding.
+     *
+     * @var array
+     */
+    const STRING_TYPE_SIZE = [
+        self::TYPE_UTF8_STRING      => 0,
+        self::TYPE_BMP_STRING       => 2,
+        self::TYPE_UNIVERSAL_STRING => 4,
+        self::TYPE_PRINTABLE_STRING => 1,
+        self::TYPE_TELETEX_STRING   => 1,
+        self::TYPE_IA5_STRING       => 1,
+        self::TYPE_VISIBLE_STRING   => 1,
+    ];
+
+    /**
+     * Parse BER-encoding
+     *
+     * Serves a similar purpose to openssl's asn1parse
+     *
+     * @param Element|string $encoded
+     * @return ?array
+     */
+    public static function decodeBER($encoded)
+    {
+        if ($encoded instanceof Element) {
+            $encoded = $encoded->element;
+        }
+
+        self::$encoded = $encoded;
+
+        $decoded = self::decode_ber($encoded);
+        if ($decoded === false) {
+            return null;
+        }
+
+        return [$decoded];
+    }
+
+    /**
+     * Parse BER-encoding (Helper function)
+     *
+     * Sometimes we want to get the BER encoding of a particular tag.  $start lets us do that without having to reencode.
+     * $encoded is passed by reference for the recursive calls done for self::TYPE_BIT_STRING and
+     * self::TYPE_OCTET_STRING. In those cases, the indefinite length is used.
+     *
+     * @param string $encoded
+     * @param int $start
+     * @param int $encoded_pos
+     * @return array|bool
+     */
+    private static function decode_ber($encoded, $start = 0, $encoded_pos = 0)
+    {
+        $current = ['start' => $start];
+
+        if (!isset($encoded[$encoded_pos])) {
+            return false;
+        }
+        $type = ord($encoded[$encoded_pos++]);
+        $startOffset = 1;
+
+        $constructed = ($type >> 5) & 1;
+
+        $tag = $type & 0x1F;
+        if ($tag == 0x1F) {
+            $tag = 0;
+            // process septets (since the eighth bit is ignored, it's not an octet)
+            do {
+                if (!isset($encoded[$encoded_pos])) {
+                    return false;
+                }
+                $temp = ord($encoded[$encoded_pos++]);
+                $startOffset++;
+                $loop = $temp >> 7;
+                $tag <<= 7;
+                $temp &= 0x7F;
+                // "bits 7 to 1 of the first subsequent octet shall not all be zero"
+                if ($startOffset == 2 && $temp == 0) {
+                    return false;
+                }
+                $tag |= $temp;
+            } while ($loop);
+        }
+
+        $start += $startOffset;
+
+        // Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
+        if (!isset($encoded[$encoded_pos])) {
+            return false;
+        }
+        $length = ord($encoded[$encoded_pos++]);
+        $start++;
+        if ($length == 0x80) { // indefinite length
+            // "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
+            //  immediately available." -- paragraph 8.1.3.2.c
+            $length = strlen($encoded) - $encoded_pos;
+        } elseif ($length & 0x80) { // definite length, long form
+            // technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
+            // support it up to four.
+            $length &= 0x7F;
+            $temp = substr($encoded, $encoded_pos, $length);
+            $encoded_pos += $length;
+            // tags of indefinte length don't really have a header length; this length includes the tag
+            $current += ['headerlength' => $length + 2];
+            $start += $length;
+            extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
+            /** @var integer $length */
+        } else {
+            $current += ['headerlength' => 2];
+        }
+
+        if ($length > (strlen($encoded) - $encoded_pos)) {
+            return false;
+        }
+
+        $content = substr($encoded, $encoded_pos, $length);
+        $content_pos = 0;
+
+        // at this point $length can be overwritten. it's only accurate for definite length things as is
+
+        /* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
+           built-in types. It defines an application-independent data type that must be distinguishable from all other
+           data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
+           have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
+           a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
+           alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
+           data type; the term CONTEXT-SPECIFIC does not appear.
+
+             -- http://www.obj-sys.com/asn1tutorial/node12.html */
+        $class = ($type >> 6) & 3;
+        switch ($class) {
+            case self::CLASS_APPLICATION:
+            case self::CLASS_PRIVATE:
+            case self::CLASS_CONTEXT_SPECIFIC:
+                if (!$constructed) {
+                    return [
+                        'type'     => $class,
+                        'constant' => $tag,
+                        'content'  => $content,
+                        'length'   => $length + $start - $current['start']
+                    ] + $current;
+                }
+
+                $newcontent = [];
+                $remainingLength = $length;
+                while ($remainingLength > 0) {
+                    $temp = self::decode_ber($content, $start, $content_pos);
+                    if ($temp === false) {
+                        break;
+                    }
+                    $length = $temp['length'];
+                    // end-of-content octets - see paragraph 8.1.5
+                    if (substr($content, $content_pos + $length, 2) == "\0\0") {
+                        $length += 2;
+                        $start += $length;
+                        $newcontent[] = $temp;
+                        break;
+                    }
+                    $start += $length;
+                    $remainingLength -= $length;
+                    $newcontent[] = $temp;
+                    $content_pos += $length;
+                }
+
+                return [
+                    'type'     => $class,
+                    'constant' => $tag,
+                    // the array encapsulation is for BC with the old format
+                    'content'  => $newcontent,
+                    // the only time when $content['headerlength'] isn't defined is when the length is indefinite.
+                    // the absence of $content['headerlength'] is how we know if something is indefinite or not.
+                    // technically, it could be defined to be 2 and then another indicator could be used but whatever.
+                    'length'   => $start - $current['start']
+                ] + $current;
+        }
+
+        $current += ['type' => $tag];
+
+        // decode UNIVERSAL tags
+        switch ($tag) {
+            case self::TYPE_BOOLEAN:
+                // "The contents octets shall consist of a single octet." -- paragraph 8.2.1
+                if ($constructed || strlen($content) != 1) {
+                    return false;
+                }
+                $current['content'] = (bool) ord($content[$content_pos]);
+                break;
+            case self::TYPE_INTEGER:
+            case self::TYPE_ENUMERATED:
+                if ($constructed) {
+                    return false;
+                }
+                $current['content'] = new BigInteger(substr($content, $content_pos), -256);
+                break;
+            case self::TYPE_REAL: // not currently supported
+                return false;
+            case self::TYPE_BIT_STRING:
+                // The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
+                // the number of unused bits in the final subsequent octet. The number shall be in the range zero to
+                // seven.
+                if (!$constructed) {
+                    $current['content'] = substr($content, $content_pos);
+                } else {
+                    $temp = self::decode_ber($content, $start, $content_pos);
+                    if ($temp === false) {
+                        return false;
+                    }
+                    $length -= (strlen($content) - $content_pos);
+                    $last = count($temp) - 1;
+                    for ($i = 0; $i < $last; $i++) {
+                        // all subtags should be bit strings
+                        if ($temp[$i]['type'] != self::TYPE_BIT_STRING) {
+                            return false;
+                        }
+                        $current['content'] .= substr($temp[$i]['content'], 1);
+                    }
+                    // all subtags should be bit strings
+                    if ($temp[$last]['type'] != self::TYPE_BIT_STRING) {
+                        return false;
+                    }
+                    $current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
+                }
+                break;
+            case self::TYPE_OCTET_STRING:
+                if (!$constructed) {
+                    $current['content'] = substr($content, $content_pos);
+                } else {
+                    $current['content'] = '';
+                    $length = 0;
+                    while (substr($content, $content_pos, 2) != "\0\0") {
+                        $temp = self::decode_ber($content, $length + $start, $content_pos);
+                        if ($temp === false) {
+                            return false;
+                        }
+                        $content_pos += $temp['length'];
+                        // all subtags should be octet strings
+                        if ($temp['type'] != self::TYPE_OCTET_STRING) {
+                            return false;
+                        }
+                        $current['content'] .= $temp['content'];
+                        $length += $temp['length'];
+                    }
+                    if (substr($content, $content_pos, 2) == "\0\0") {
+                        $length += 2; // +2 for the EOC
+                    }
+                }
+                break;
+            case self::TYPE_NULL:
+                // "The contents octets shall not contain any octets." -- paragraph 8.8.2
+                if ($constructed || strlen($content)) {
+                    return false;
+                }
+                break;
+            case self::TYPE_SEQUENCE:
+            case self::TYPE_SET:
+                if (!$constructed) {
+                    return false;
+                }
+                $offset = 0;
+                $current['content'] = [];
+                $content_len = strlen($content);
+                while ($content_pos < $content_len) {
+                    // if indefinite length construction was used and we have an end-of-content string next
+                    // see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
+                    if (!isset($current['headerlength']) && substr($content, $content_pos, 2) == "\0\0") {
+                        $length = $offset + 2; // +2 for the EOC
+                        break 2;
+                    }
+                    $temp = self::decode_ber($content, $start + $offset, $content_pos);
+                    if ($temp === false) {
+                        return false;
+                    }
+                    $content_pos += $temp['length'];
+                    $current['content'][] = $temp;
+                    $offset += $temp['length'];
+                }
+                break;
+            case self::TYPE_OBJECT_IDENTIFIER:
+                if ($constructed) {
+                    return false;
+                }
+                $current['content'] = self::decodeOID(substr($content, $content_pos));
+                if ($current['content'] === false) {
+                    return false;
+                }
+                break;
+            /* Each character string type shall be encoded as if it had been declared:
+               [UNIVERSAL x] IMPLICIT OCTET STRING
+
+                 -- X.690-0207.pdf#page=23 (paragraph 8.21.3)
+
+               Per that, we're not going to do any validation.  If there are any illegal characters in the string,
+               we don't really care */
+            case self::TYPE_NUMERIC_STRING:
+                // 0,1,2,3,4,5,6,7,8,9, and space
+            case self::TYPE_PRINTABLE_STRING:
+                // Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
+                // hyphen, full stop, solidus, colon, equal sign, question mark
+            case self::TYPE_TELETEX_STRING:
+                // The Teletex character set in CCITT's T61, space, and delete
+                // see http://en.wikipedia.org/wiki/Teletex#Character_sets
+            case self::TYPE_VIDEOTEX_STRING:
+                // The Videotex character set in CCITT's T.100 and T.101, space, and delete
+            case self::TYPE_VISIBLE_STRING:
+                // Printing character sets of international ASCII, and space
+            case self::TYPE_IA5_STRING:
+                // International Alphabet 5 (International ASCII)
+            case self::TYPE_GRAPHIC_STRING:
+                // All registered G sets, and space
+            case self::TYPE_GENERAL_STRING:
+                // All registered C and G sets, space and delete
+            case self::TYPE_UTF8_STRING:
+                // ????
+            case self::TYPE_BMP_STRING:
+                if ($constructed) {
+                    return false;
+                }
+                $current['content'] = substr($content, $content_pos);
+                break;
+            case self::TYPE_UTC_TIME:
+            case self::TYPE_GENERALIZED_TIME:
+                if ($constructed) {
+                    return false;
+                }
+                $current['content'] = self::decodeTime(substr($content, $content_pos), $tag);
+                break;
+            default:
+                return false;
+        }
+
+        $start += $length;
+
+        // ie. length is the length of the full TLV encoding - it's not just the length of the value
+        return $current + ['length' => $start - $current['start']];
+    }
+
+    /**
+     * ASN.1 Map
+     *
+     * Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
+     *
+     * "Special" mappings may be applied on a per tag-name basis via $special.
+     *
+     * @param array $decoded
+     * @param array $mapping
+     * @param array $special
+     * @return array|bool|Element|string|null
+     */
+    public static function asn1map(array $decoded, $mapping, $special = [])
+    {
+        if (isset($mapping['explicit']) && is_array($decoded['content'])) {
+            $decoded = $decoded['content'][0];
+        }
+
+        switch (true) {
+            case $mapping['type'] == self::TYPE_ANY:
+                $intype = $decoded['type'];
+                // !isset(self::ANY_MAP[$intype]) produces a fatal error on PHP 5.6
+                if (isset($decoded['constant']) || !array_key_exists($intype, self::ANY_MAP) || (ord(self::$encoded[$decoded['start']]) & 0x20)) {
+                    return new Element(substr(self::$encoded, $decoded['start'], $decoded['length']));
+                }
+                $inmap = self::ANY_MAP[$intype];
+                if (is_string($inmap)) {
+                    return [$inmap => self::asn1map($decoded, ['type' => $intype] + $mapping, $special)];
+                }
+                break;
+            case $mapping['type'] == self::TYPE_CHOICE:
+                foreach ($mapping['children'] as $key => $option) {
+                    switch (true) {
+                        case isset($option['constant']) && $option['constant'] == $decoded['constant']:
+                        case !isset($option['constant']) && $option['type'] == $decoded['type']:
+                            $value = self::asn1map($decoded, $option, $special);
+                            break;
+                        case !isset($option['constant']) && $option['type'] == self::TYPE_CHOICE:
+                            $v = self::asn1map($decoded, $option, $special);
+                            if (isset($v)) {
+                                $value = $v;
+                            }
+                    }
+                    if (isset($value)) {
+                        if (isset($special[$key])) {
+                            $value = $special[$key]($value);
+                        }
+                        return [$key => $value];
+                    }
+                }
+                return null;
+            case isset($mapping['implicit']):
+            case isset($mapping['explicit']):
+            case $decoded['type'] == $mapping['type']:
+                break;
+            default:
+                // if $decoded['type'] and $mapping['type'] are both strings, but different types of strings,
+                // let it through
+                switch (true) {
+                    case $decoded['type'] < 18: // self::TYPE_NUMERIC_STRING == 18
+                    case $decoded['type'] > 30: // self::TYPE_BMP_STRING == 30
+                    case $mapping['type'] < 18:
+                    case $mapping['type'] > 30:
+                        return null;
+                }
+        }
+
+        if (isset($mapping['implicit'])) {
+            $decoded['type'] = $mapping['type'];
+        }
+
+        switch ($decoded['type']) {
+            case self::TYPE_SEQUENCE:
+                $map = [];
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $child = $mapping['children'];
+                    foreach ($decoded['content'] as $content) {
+                        if (($map[] = self::asn1map($content, $child, $special)) === null) {
+                            return null;
+                        }
+                    }
+
+                    return $map;
+                }
+
+                $n = count($decoded['content']);
+                $i = 0;
+
+                foreach ($mapping['children'] as $key => $child) {
+                    $maymatch = $i < $n; // Match only existing input.
+                    if ($maymatch) {
+                        $temp = $decoded['content'][$i];
+
+                        if ($child['type'] != self::TYPE_CHOICE) {
+                            // Get the mapping and input class & constant.
+                            $childClass = $tempClass = self::CLASS_UNIVERSAL;
+                            $constant = null;
+                            if (isset($temp['constant'])) {
+                                $tempClass = $temp['type'];
+                            }
+                            if (isset($child['class'])) {
+                                $childClass = $child['class'];
+                                $constant = $child['cast'];
+                            } elseif (isset($child['constant'])) {
+                                $childClass = self::CLASS_CONTEXT_SPECIFIC;
+                                $constant = $child['constant'];
+                            }
+
+                            if (isset($constant) && isset($temp['constant'])) {
+                                // Can only match if constants and class match.
+                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
+                            } else {
+                                // Can only match if no constant expected and type matches or is generic.
+                                $maymatch = !isset($child['constant']) && array_search($child['type'], [$temp['type'], self::TYPE_ANY, self::TYPE_CHOICE]) !== false;
+                            }
+                        }
+                    }
+
+                    if ($maymatch) {
+                        // Attempt submapping.
+                        $candidate = self::asn1map($temp, $child, $special);
+                        $maymatch = $candidate !== null;
+                    }
+
+                    if ($maymatch) {
+                        // Got the match: use it.
+                        if (isset($special[$key])) {
+                            $candidate = $special[$key]($candidate);
+                        }
+                        $map[$key] = $candidate;
+                        $i++;
+                    } elseif (isset($child['default'])) {
+                        $map[$key] = $child['default'];
+                    } elseif (!isset($child['optional'])) {
+                        return null; // Syntax error.
+                    }
+                }
+
+                // Fail mapping if all input items have not been consumed.
+                return $i < $n ? null : $map;
+
+            // the main diff between sets and sequences is the encapsulation of the foreach in another for loop
+            case self::TYPE_SET:
+                $map = [];
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $child = $mapping['children'];
+                    foreach ($decoded['content'] as $content) {
+                        if (($map[] = self::asn1map($content, $child, $special)) === null) {
+                            return null;
+                        }
+                    }
+
+                    return $map;
+                }
+
+                for ($i = 0; $i < count($decoded['content']); $i++) {
+                    $temp = $decoded['content'][$i];
+                    $tempClass = self::CLASS_UNIVERSAL;
+                    if (isset($temp['constant'])) {
+                        $tempClass = $temp['type'];
+                    }
+
+                    foreach ($mapping['children'] as $key => $child) {
+                        if (isset($map[$key])) {
+                            continue;
+                        }
+                        $maymatch = true;
+                        if ($child['type'] != self::TYPE_CHOICE) {
+                            $childClass = self::CLASS_UNIVERSAL;
+                            $constant = null;
+                            if (isset($child['class'])) {
+                                $childClass = $child['class'];
+                                $constant = $child['cast'];
+                            } elseif (isset($child['constant'])) {
+                                $childClass = self::CLASS_CONTEXT_SPECIFIC;
+                                $constant = $child['constant'];
+                            }
+
+                            if (isset($constant) && isset($temp['constant'])) {
+                                // Can only match if constants and class match.
+                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
+                            } else {
+                                // Can only match if no constant expected and type matches or is generic.
+                                $maymatch = !isset($child['constant']) && array_search($child['type'], [$temp['type'], self::TYPE_ANY, self::TYPE_CHOICE]) !== false;
+                            }
+                        }
+
+                        if ($maymatch) {
+                            // Attempt submapping.
+                            $candidate = self::asn1map($temp, $child, $special);
+                            $maymatch = $candidate !== null;
+                        }
+
+                        if (!$maymatch) {
+                            break;
+                        }
+
+                        // Got the match: use it.
+                        if (isset($special[$key])) {
+                            $candidate = $special[$key]($candidate);
+                        }
+                        $map[$key] = $candidate;
+                        break;
+                    }
+                }
+
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!isset($map[$key])) {
+                        if (isset($child['default'])) {
+                            $map[$key] = $child['default'];
+                        } elseif (!isset($child['optional'])) {
+                            return null;
+                        }
+                    }
+                }
+                return $map;
+            case self::TYPE_OBJECT_IDENTIFIER:
+                return isset(self::$oids[$decoded['content']]) ? self::$oids[$decoded['content']] : $decoded['content'];
+            case self::TYPE_UTC_TIME:
+            case self::TYPE_GENERALIZED_TIME:
+                // for explicitly tagged optional stuff
+                if (is_array($decoded['content'])) {
+                    $decoded['content'] = $decoded['content'][0]['content'];
+                }
+                // for implicitly tagged optional stuff
+                // in theory, doing isset($mapping['implicit']) would work but malformed certs do exist
+                // in the wild that OpenSSL decodes without issue so we'll support them as well
+                if (!is_object($decoded['content'])) {
+                    $decoded['content'] = self::decodeTime($decoded['content'], $decoded['type']);
+                }
+                return $decoded['content'] ? $decoded['content']->format(self::$format) : false;
+            case self::TYPE_BIT_STRING:
+                if (isset($mapping['mapping'])) {
+                    $offset = ord($decoded['content'][0]);
+                    $size = (strlen($decoded['content']) - 1) * 8 - $offset;
+                    /*
+                       From X.680-0207.pdf#page=46 (21.7):
+
+                       "When a "NamedBitList" is used in defining a bitstring type ASN.1 encoding rules are free to add (or remove)
+                        arbitrarily any trailing 0 bits to (or from) values that are being encoded or decoded. Application designers should
+                        therefore ensure that different semantics are not associated with such values which differ only in the number of trailing
+                        0 bits."
+                    */
+                    $bits = count($mapping['mapping']) == $size ? [] : array_fill(0, count($mapping['mapping']) - $size, false);
+                    for ($i = strlen($decoded['content']) - 1; $i > 0; $i--) {
+                        $current = ord($decoded['content'][$i]);
+                        for ($j = $offset; $j < 8; $j++) {
+                            $bits[] = (bool) ($current & (1 << $j));
+                        }
+                        $offset = 0;
+                    }
+                    $values = [];
+                    $map = array_reverse($mapping['mapping']);
+                    foreach ($map as $i => $value) {
+                        if ($bits[$i]) {
+                            $values[] = $value;
+                        }
+                    }
+                    return $values;
+                }
+                // fall-through
+            case self::TYPE_OCTET_STRING:
+                return $decoded['content'];
+            case self::TYPE_NULL:
+                return '';
+            case self::TYPE_BOOLEAN:
+            case self::TYPE_NUMERIC_STRING:
+            case self::TYPE_PRINTABLE_STRING:
+            case self::TYPE_TELETEX_STRING:
+            case self::TYPE_VIDEOTEX_STRING:
+            case self::TYPE_IA5_STRING:
+            case self::TYPE_GRAPHIC_STRING:
+            case self::TYPE_VISIBLE_STRING:
+            case self::TYPE_GENERAL_STRING:
+            case self::TYPE_UNIVERSAL_STRING:
+            case self::TYPE_UTF8_STRING:
+            case self::TYPE_BMP_STRING:
+                return $decoded['content'];
+            case self::TYPE_INTEGER:
+            case self::TYPE_ENUMERATED:
+                $temp = $decoded['content'];
+                if (isset($mapping['implicit'])) {
+                    $temp = new BigInteger($decoded['content'], -256);
+                }
+                if (isset($mapping['mapping'])) {
+                    $temp = (int) $temp->toString();
+                    return isset($mapping['mapping'][$temp]) ?
+                        $mapping['mapping'][$temp] :
+                        false;
+                }
+                return $temp;
+        }
+    }
+
+    /**
+     * DER-decode the length
+     *
+     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
+     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
+     *
+     * @param string $string
+     * @return int
+     */
+    public static function decodeLength(&$string)
+    {
+        $length = ord(Strings::shift($string));
+        if ($length & 0x80) { // definite length, long form
+            $length &= 0x7F;
+            $temp = Strings::shift($string, $length);
+            list(, $length) = unpack('N', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4));
+        }
+        return $length;
+    }
+
+    /**
+     * ASN.1 Encode
+     *
+     * DER-encodes an ASN.1 semantic mapping ($mapping).  Some libraries would probably call this function
+     * an ASN.1 compiler.
+     *
+     * "Special" mappings can be applied via $special.
+     *
+     * @param Element|string|array $source
+     * @param array $mapping
+     * @param array $special
+     * @return string
+     */
+    public static function encodeDER($source, $mapping, $special = [])
+    {
+        self::$location = [];
+        return self::encode_der($source, $mapping, null, $special);
+    }
+
+    /**
+     * ASN.1 Encode (Helper function)
+     *
+     * @param Element|string|array|null $source
+     * @param array $mapping
+     * @param int $idx
+     * @param array $special
+     * @return string
+     */
+    private static function encode_der($source, array $mapping, $idx = null, array $special = [])
+    {
+        if ($source instanceof Element) {
+            return $source->element;
+        }
+
+        // do not encode (implicitly optional) fields with value set to default
+        if (isset($mapping['default']) && $source === $mapping['default']) {
+            return '';
+        }
+
+        if (isset($idx)) {
+            if (isset($special[$idx])) {
+                $source = $special[$idx]($source);
+            }
+            self::$location[] = $idx;
+        }
+
+        $tag = $mapping['type'];
+
+        switch ($tag) {
+            case self::TYPE_SET:    // Children order is not important, thus process in sequence.
+            case self::TYPE_SEQUENCE:
+                $tag |= 0x20; // set the constructed bit
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $value = [];
+                    $child = $mapping['children'];
+
+                    foreach ($source as $content) {
+                        $temp = self::encode_der($content, $child, null, $special);
+                        if ($temp === false) {
+                            return false;
+                        }
+                        $value[] = $temp;
+                    }
+                    /* "The encodings of the component values of a set-of value shall appear in ascending order, the encodings being compared
+                        as octet strings with the shorter components being padded at their trailing end with 0-octets.
+                        NOTE - The padding octets are for comparison purposes only and do not appear in the encodings."
+
+                       -- sec 11.6 of http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf  */
+                    if ($mapping['type'] == self::TYPE_SET) {
+                        sort($value);
+                    }
+                    $value = implode('', $value);
+                    break;
+                }
+
+                $value = '';
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!array_key_exists($key, $source)) {
+                        if (!isset($child['optional'])) {
+                            return false;
+                        }
+                        continue;
+                    }
+
+                    $temp = self::encode_der($source[$key], $child, $key, $special);
+                    if ($temp === false) {
+                        return false;
+                    }
+
+                    // An empty child encoding means it has been optimized out.
+                    // Else we should have at least one tag byte.
+                    if ($temp === '') {
+                        continue;
+                    }
+
+                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
+                    if (isset($child['constant'])) {
+                        /*
+                           From X.680-0207.pdf#page=58 (30.6):
+
+                           "The tagging construction specifies explicit tagging if any of the following holds:
+                            ...
+                            c) the "Tag Type" alternative is used and the value of "TagDefault" for the module is IMPLICIT TAGS or
+                            AUTOMATIC TAGS, but the type defined by "Type" is an untagged choice type, an untagged open type, or
+                            an untagged "DummyReference" (see ITU-T Rec. X.683 | ISO/IEC 8824-4, 8.3)."
+                         */
+                        if (isset($child['explicit']) || $child['type'] == self::TYPE_CHOICE) {
+                            $subtag = chr((self::CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
+                            $temp = $subtag . self::encodeLength(strlen($temp)) . $temp;
+                        } else {
+                            $subtag = chr((self::CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
+                            $temp = $subtag . substr($temp, 1);
+                        }
+                    }
+                    $value .= $temp;
+                }
+                break;
+            case self::TYPE_CHOICE:
+                $temp = false;
+
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!isset($source[$key])) {
+                        continue;
+                    }
+
+                    $temp = self::encode_der($source[$key], $child, $key, $special);
+                    if ($temp === false) {
+                        return false;
+                    }
+
+                    // An empty child encoding means it has been optimized out.
+                    // Else we should have at least one tag byte.
+                    if ($temp === '') {
+                        continue;
+                    }
+
+                    $tag = ord($temp[0]);
+
+                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
+                    if (isset($child['constant'])) {
+                        if (isset($child['explicit']) || $child['type'] == self::TYPE_CHOICE) {
+                            $subtag = chr((self::CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
+                            $temp = $subtag . self::encodeLength(strlen($temp)) . $temp;
+                        } else {
+                            $subtag = chr((self::CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
+                            $temp = $subtag . substr($temp, 1);
+                        }
+                    }
+                }
+
+                if (isset($idx)) {
+                    array_pop(self::$location);
+                }
+
+                if ($temp && isset($mapping['cast'])) {
+                    $temp[0] = chr(($mapping['class'] << 6) | ($tag & 0x20) | $mapping['cast']);
+                }
+
+                return $temp;
+            case self::TYPE_INTEGER:
+            case self::TYPE_ENUMERATED:
+                if (!isset($mapping['mapping'])) {
+                    if (is_numeric($source)) {
+                        $source = new BigInteger($source);
+                    }
+                    $value = $source->toBytes(true);
+                } else {
+                    $value = array_search($source, $mapping['mapping']);
+                    if ($value === false) {
+                        return false;
+                    }
+                    $value = new BigInteger($value);
+                    $value = $value->toBytes(true);
+                }
+                if (!strlen($value)) {
+                    $value = chr(0);
+                }
+                break;
+            case self::TYPE_UTC_TIME:
+            case self::TYPE_GENERALIZED_TIME:
+                $format = $mapping['type'] == self::TYPE_UTC_TIME ? 'y' : 'Y';
+                $format .= 'mdHis';
+                // if $source does _not_ include timezone information within it then assume that the timezone is GMT
+                $date = new \DateTime($source, new \DateTimeZone('GMT'));
+                // if $source _does_ include timezone information within it then convert the time to GMT
+                $date->setTimezone(new \DateTimeZone('GMT'));
+                $value = $date->format($format) . 'Z';
+                break;
+            case self::TYPE_BIT_STRING:
+                if (isset($mapping['mapping'])) {
+                    $bits = array_fill(0, count($mapping['mapping']), 0);
+                    $size = 0;
+                    for ($i = 0; $i < count($mapping['mapping']); $i++) {
+                        if (in_array($mapping['mapping'][$i], $source)) {
+                            $bits[$i] = 1;
+                            $size = $i;
+                        }
+                    }
+
+                    if (isset($mapping['min']) && $mapping['min'] >= 1 && $size < $mapping['min']) {
+                        $size = $mapping['min'] - 1;
+                    }
+
+                    $offset = 8 - (($size + 1) & 7);
+                    $offset = $offset !== 8 ? $offset : 0;
+
+                    $value = chr($offset);
+
+                    for ($i = $size + 1; $i < count($mapping['mapping']); $i++) {
+                        unset($bits[$i]);
+                    }
+
+                    $bits = implode('', array_pad($bits, $size + $offset + 1, 0));
+                    $bytes = explode(' ', rtrim(chunk_split($bits, 8, ' ')));
+                    foreach ($bytes as $byte) {
+                        $value .= chr(bindec($byte));
+                    }
+
+                    break;
+                }
+                // fall-through
+            case self::TYPE_OCTET_STRING:
+                /* The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
+                   the number of unused bits in the final subsequent octet. The number shall be in the range zero to seven.
+
+                   -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=16 */
+                $value = $source;
+                break;
+            case self::TYPE_OBJECT_IDENTIFIER:
+                $value = self::encodeOID($source);
+                break;
+            case self::TYPE_ANY:
+                $loc = self::$location;
+                if (isset($idx)) {
+                    array_pop(self::$location);
+                }
+
+                switch (true) {
+                    case !isset($source):
+                        return self::encode_der(null, ['type' => self::TYPE_NULL] + $mapping, null, $special);
+                    case is_int($source):
+                    case $source instanceof BigInteger:
+                        return self::encode_der($source, ['type' => self::TYPE_INTEGER] + $mapping, null, $special);
+                    case is_float($source):
+                        return self::encode_der($source, ['type' => self::TYPE_REAL] + $mapping, null, $special);
+                    case is_bool($source):
+                        return self::encode_der($source, ['type' => self::TYPE_BOOLEAN] + $mapping, null, $special);
+                    case is_array($source) && count($source) == 1:
+                        $typename = implode('', array_keys($source));
+                        $outtype = array_search($typename, self::ANY_MAP, true);
+                        if ($outtype !== false) {
+                            return self::encode_der($source[$typename], ['type' => $outtype] + $mapping, null, $special);
+                        }
+                }
+
+                $filters = self::$filters;
+                foreach ($loc as $part) {
+                    if (!isset($filters[$part])) {
+                        $filters = false;
+                        break;
+                    }
+                    $filters = $filters[$part];
+                }
+                if ($filters === false) {
+                    throw new \RuntimeException('No filters defined for ' . implode('/', $loc));
+                }
+                return self::encode_der($source, $filters + $mapping, null, $special);
+            case self::TYPE_NULL:
+                $value = '';
+                break;
+            case self::TYPE_NUMERIC_STRING:
+            case self::TYPE_TELETEX_STRING:
+            case self::TYPE_PRINTABLE_STRING:
+            case self::TYPE_UNIVERSAL_STRING:
+            case self::TYPE_UTF8_STRING:
+            case self::TYPE_BMP_STRING:
+            case self::TYPE_IA5_STRING:
+            case self::TYPE_VISIBLE_STRING:
+            case self::TYPE_VIDEOTEX_STRING:
+            case self::TYPE_GRAPHIC_STRING:
+            case self::TYPE_GENERAL_STRING:
+                $value = $source;
+                break;
+            case self::TYPE_BOOLEAN:
+                $value = $source ? "\xFF" : "\x00";
+                break;
+            default:
+                throw new \RuntimeException('Mapping provides no type definition for ' . implode('/', self::$location));
+        }
+
+        if (isset($idx)) {
+            array_pop(self::$location);
+        }
+
+        if (isset($mapping['cast'])) {
+            if (isset($mapping['explicit']) || $mapping['type'] == self::TYPE_CHOICE) {
+                $value = chr($tag) . self::encodeLength(strlen($value)) . $value;
+                $tag = ($mapping['class'] << 6) | 0x20 | $mapping['cast'];
+            } else {
+                $tag = ($mapping['class'] << 6) | (ord($temp[0]) & 0x20) | $mapping['cast'];
+            }
+        }
+
+        return chr($tag) . self::encodeLength(strlen($value)) . $value;
+    }
+
+    /**
+     * BER-decode the OID
+     *
+     * Called by _decode_ber()
+     *
+     * @param string $content
+     * @return string
+     */
+    public static function decodeOID($content)
+    {
+        static $eighty;
+        if (!$eighty) {
+            $eighty = new BigInteger(80);
+        }
+
+        $oid = [];
+        $pos = 0;
+        $len = strlen($content);
+        // see https://github.com/openjdk/jdk/blob/2deb318c9f047ec5a4b160d66a4b52f93688ec42/src/java.base/share/classes/sun/security/util/ObjectIdentifier.java#L55
+        if ($len > 4096) {
+            //throw new \RuntimeException("Object identifier size is limited to 4096 bytes ($len bytes present)");
+            return false;
+        }
+
+        if (ord($content[$len - 1]) & 0x80) {
+            return false;
+        }
+
+        $n = new BigInteger();
+        while ($pos < $len) {
+            $temp = ord($content[$pos++]);
+            $n = $n->bitwise_leftShift(7);
+            $n = $n->bitwise_or(new BigInteger($temp & 0x7F));
+            if (~$temp & 0x80) {
+                $oid[] = $n;
+                $n = new BigInteger();
+            }
+        }
+        $part1 = array_shift($oid);
+        $first = floor(ord($content[0]) / 40);
+        /*
+          "This packing of the first two object identifier components recognizes that only three values are allocated from the root
+           node, and at most 39 subsequent values from nodes reached by X = 0 and X = 1."
+
+          -- https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=22
+        */
+        if ($first <= 2) { // ie. 0 <= ord($content[0]) < 120 (0x78)
+            array_unshift($oid, ord($content[0]) % 40);
+            array_unshift($oid, $first);
+        } else {
+            array_unshift($oid, $part1->subtract($eighty));
+            array_unshift($oid, 2);
+        }
+
+        return implode('.', $oid);
+    }
+
+    /**
+     * DER-encode the OID
+     *
+     * Called by _encode_der()
+     *
+     * @param string $source
+     * @return string
+     */
+    public static function encodeOID($source)
+    {
+        static $mask, $zero, $forty;
+        if (!$mask) {
+            $mask = new BigInteger(0x7F);
+            $zero = new BigInteger();
+            $forty = new BigInteger(40);
+        }
+
+        if (!preg_match('#(?:\d+\.)+#', $source)) {
+            $oid = isset(self::$reverseOIDs[$source]) ? self::$reverseOIDs[$source] : false;
+        } else {
+            $oid = $source;
+        }
+        if ($oid === false) {
+            throw new \RuntimeException('Invalid OID');
+        }
+
+        $parts = explode('.', $oid);
+        $part1 = array_shift($parts);
+        $part2 = array_shift($parts);
+
+        $first = new BigInteger($part1);
+        $first = $first->multiply($forty);
+        $first = $first->add(new BigInteger($part2));
+
+        array_unshift($parts, $first->toString());
+
+        $value = '';
+        foreach ($parts as $part) {
+            if (!$part) {
+                $temp = "\0";
+            } else {
+                $temp = '';
+                $part = new BigInteger($part);
+                while (!$part->equals($zero)) {
+                    $submask = $part->bitwise_and($mask);
+                    $submask->setPrecision(8);
+                    $temp = (chr(0x80) | $submask->toBytes()) . $temp;
+                    $part = $part->bitwise_rightShift(7);
+                }
+                $temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F);
+            }
+            $value .= $temp;
+        }
+
+        return $value;
+    }
+
+    /**
+     * BER-decode the time
+     *
+     * Called by _decode_ber() and in the case of implicit tags asn1map().
+     *
+     * @param string $content
+     * @param int $tag
+     * @return \DateTime|false
+     */
+    private static function decodeTime($content, $tag)
+    {
+        /* UTCTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
+           http://www.obj-sys.com/asn1tutorial/node15.html
+
+           GeneralizedTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
+           http://www.obj-sys.com/asn1tutorial/node14.html */
+
+        $format = 'YmdHis';
+
+        if ($tag == self::TYPE_UTC_TIME) {
+            // https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=28 says "the seconds
+            // element shall always be present" but none-the-less I've seen X509 certs where it isn't and if the
+            // browsers parse it phpseclib ought to too
+            if (preg_match('#^(\d{10})(Z|[+-]\d{4})$#', $content, $matches)) {
+                $content = $matches[1] . '00' . $matches[2];
+            }
+            $prefix = substr($content, 0, 2) >= 50 ? '19' : '20';
+            $content = $prefix . $content;
+        } elseif (strpos($content, '.') !== false) {
+            $format .= '.u';
+        }
+
+        if ($content[strlen($content) - 1] == 'Z') {
+            $content = substr($content, 0, -1) . '+0000';
+        }
+
+        if (strpos($content, '-') !== false || strpos($content, '+') !== false) {
+            $format .= 'O';
+        }
+
+        // error supression isn't necessary as of PHP 7.0:
+        // http://php.net/manual/en/migration70.other-changes.php
+        return @\DateTime::createFromFormat($format, $content);
+    }
+
+    /**
+     * Set the time format
+     *
+     * Sets the time / date format for asn1map().
+     *
+     * @param string $format
+     */
+    public static function setTimeFormat($format)
+    {
+        self::$format = $format;
+    }
+
+    /**
+     * Load OIDs
+     *
+     * Load the relevant OIDs for a particular ASN.1 semantic mapping.
+     * Previously loaded OIDs are retained.
+     *
+     * @param array $oids
+     */
+    public static function loadOIDs(array $oids)
+    {
+        self::$reverseOIDs += $oids;
+        self::$oids = array_flip(self::$reverseOIDs);
+    }
+
+    /**
+     * Set filters
+     *
+     * See \phpseclib3\File\X509, etc, for an example.
+     * Previously loaded filters are not retained.
+     *
+     * @param array $filters
+     */
+    public static function setFilters(array $filters)
+    {
+        self::$filters = $filters;
+    }
+
+    /**
+     * String type conversion
+     *
+     * This is a lazy conversion, dealing only with character size.
+     * No real conversion table is used.
+     *
+     * @param string $in
+     * @param int $from
+     * @param int $to
+     * @return string
+     */
+    public static function convert($in, $from = self::TYPE_UTF8_STRING, $to = self::TYPE_UTF8_STRING)
+    {
+        // isset(self::STRING_TYPE_SIZE[$from] returns a fatal error on PHP 5.6
+        if (!array_key_exists($from, self::STRING_TYPE_SIZE) || !array_key_exists($to, self::STRING_TYPE_SIZE)) {
+            return false;
+        }
+        $insize = self::STRING_TYPE_SIZE[$from];
+        $outsize = self::STRING_TYPE_SIZE[$to];
+        $inlength = strlen($in);
+        $out = '';
+
+        for ($i = 0; $i < $inlength;) {
+            if ($inlength - $i < $insize) {
+                return false;
+            }
+
+            // Get an input character as a 32-bit value.
+            $c = ord($in[$i++]);
+            switch (true) {
+                case $insize == 4:
+                    $c = ($c << 8) | ord($in[$i++]);
+                    $c = ($c << 8) | ord($in[$i++]);
+                    // fall-through
+                case $insize == 2:
+                    $c = ($c << 8) | ord($in[$i++]);
+                    // fall-through
+                case $insize == 1:
+                    break;
+                case ($c & 0x80) == 0x00:
+                    break;
+                case ($c & 0x40) == 0x00:
+                    return false;
+                default:
+                    $bit = 6;
+                    do {
+                        if ($bit > 25 || $i >= $inlength || (ord($in[$i]) & 0xC0) != 0x80) {
+                            return false;
+                        }
+                        $c = ($c << 6) | (ord($in[$i++]) & 0x3F);
+                        $bit += 5;
+                        $mask = 1 << $bit;
+                    } while ($c & $bit);
+                    $c &= $mask - 1;
+                    break;
+            }
+
+            // Convert and append the character to output string.
+            $v = '';
+            switch (true) {
+                case $outsize == 4:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    // fall-through
+                case $outsize == 2:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    // fall-through
+                case $outsize == 1:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    if ($c) {
+                        return false;
+                    }
+                    break;
+                case ($c & (PHP_INT_SIZE == 8 ? 0x80000000 : (1 << 31))) != 0:
+                    return false;
+                case $c >= 0x04000000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x04000000;
+                    // fall-through
+                case $c >= 0x00200000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00200000;
+                    // fall-through
+                case $c >= 0x00010000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00010000;
+                    // fall-through
+                case $c >= 0x00000800:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00000800;
+                    // fall-through
+                case $c >= 0x00000080:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x000000C0;
+                    // fall-through
+                default:
+                    $v .= chr($c);
+                    break;
+            }
+            $out .= strrev($v);
+        }
+        return $out;
+    }
+
+    /**
+     * Extract raw BER from Base64 encoding
+     *
+     * @param string $str
+     * @return string
+     */
+    public static function extractBER($str)
+    {
+        /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them
+         * above and beyond the ceritificate.
+         * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line:
+         *
+         * Bag Attributes
+         *     localKeyID: 01 00 00 00
+         * subject=/O=organization/OU=org unit/CN=common name
+         * issuer=/O=organization/CN=common name
+         */
+        if (strlen($str) > ini_get('pcre.backtrack_limit')) {
+            $temp = $str;
+        } else {
+            $temp = preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1);
+            $temp = preg_replace('#-+END.*[\r\n ]*.*#ms', '', $temp, 1);
+        }
+        // remove new lines
+        $temp = str_replace(["\r", "\n", ' '], '', $temp);
+        // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
+        $temp = preg_replace('#^-+[^-]+-+|-+[^-]+-+$#', '', $temp);
+        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? Strings::base64_decode($temp) : false;
+        return $temp != false ? $temp : $str;
+    }
+
+    /**
+     * DER-encode the length
+     *
+     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
+     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
+     *
+     * @param int $length
+     * @return string
+     */
+    public static function encodeLength($length)
+    {
+        if ($length <= 0x7F) {
+            return chr($length);
+        }
+
+        $temp = ltrim(pack('N', $length), chr(0));
+        return pack('Ca*', 0x80 | strlen($temp), $temp);
+    }
+
+    /**
+     * Returns the OID corresponding to a name
+     *
+     * What's returned in the associative array returned by loadX509() (or load*()) is either a name or an OID if
+     * no OID to name mapping is available. The problem with this is that what may be an unmapped OID in one version
+     * of phpseclib may not be unmapped in the next version, so apps that are looking at this OID may not be able
+     * to work from version to version.
+     *
+     * This method will return the OID if a name is passed to it and if no mapping is avialable it'll assume that
+     * what's being passed to it already is an OID and return that instead. A few examples.
+     *
+     * getOID('2.16.840.1.101.3.4.2.1') == '2.16.840.1.101.3.4.2.1'
+     * getOID('id-sha256') == '2.16.840.1.101.3.4.2.1'
+     * getOID('zzz') == 'zzz'
+     *
+     * @param string $name
+     * @return string
+     */
+    public static function getOID($name)
+    {
+        return isset(self::$reverseOIDs[$name]) ? self::$reverseOIDs[$name] : $name;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Element.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Element.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Element.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * ASN.1 Raw Element
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1;
+
+/**
+ * ASN.1 Raw Element
+ *
+ * An ASN.1 ANY mapping will return an ASN1\Element object. Use of this object
+ * will also bypass the normal encoding rules in ASN1::encodeDER()
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Element
+{
+    /**
+     * Raw element value
+     *
+     * @var string
+     */
+    public $element;
+
+    /**
+     * Constructor
+     *
+     * @param string $encoded
+     * @return Element
+     */
+    public function __construct($encoded)
+    {
+        $this->element = $encoded;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AccessDescription.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AccessDescription.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AccessDescription.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * AccessDescription
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AccessDescription
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AccessDescription
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'accessMethod' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'accessLocation' => GeneralName::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AdministrationDomainName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AdministrationDomainName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AdministrationDomainName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * AdministrationDomainName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AdministrationDomainName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AdministrationDomainName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        // if class isn't present it's assumed to be \phpseclib3\File\ASN1::CLASS_UNIVERSAL or
+        // (if constant is present) \phpseclib3\File\ASN1::CLASS_CONTEXT_SPECIFIC
+        'class' => ASN1::CLASS_APPLICATION,
+        'cast' => 2,
+        'children' => [
+            'numeric' => ['type' => ASN1::TYPE_NUMERIC_STRING],
+            'printable' => ['type' => ASN1::TYPE_PRINTABLE_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AlgorithmIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AlgorithmIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AlgorithmIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * AlgorithmIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AlgorithmIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AlgorithmIdentifier
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'algorithm' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'parameters' => [
+                'type' => ASN1::TYPE_ANY,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AnotherName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AnotherName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AnotherName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * AnotherName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AnotherName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AnotherName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'type-id' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'value' => [
+                'type' => ASN1::TYPE_ANY,
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attribute.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Attribute
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Attribute
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Attribute
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'type' => AttributeType::MAP,
+            'value' => [
+                'type' => ASN1::TYPE_SET,
+                'min' => 1,
+                'max' => -1,
+                'children' => AttributeValue::MAP
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeType.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeType.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeType.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * AttributeType
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AttributeType
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AttributeType
+{
+    const MAP = ['type' => ASN1::TYPE_OBJECT_IDENTIFIER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeTypeAndValue.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeTypeAndValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeTypeAndValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * AttributeTypeAndValue
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AttributeTypeAndValue
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AttributeTypeAndValue
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'type' => AttributeType::MAP,
+            'value' => AttributeValue::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeValue.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AttributeValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * AttributeValue
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AttributeValue
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AttributeValue
+{
+    const MAP = ['type' => ASN1::TYPE_ANY];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attributes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Attributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Attributes
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Attributes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Attributes
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SET,
+        'min' => 1,
+        'max' => -1,
+        'children' => Attribute::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityInfoAccessSyntax.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityInfoAccessSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityInfoAccessSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * AuthorityInfoAccessSyntax
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AuthorityInfoAccessSyntax
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AuthorityInfoAccessSyntax
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => AccessDescription::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityKeyIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityKeyIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/AuthorityKeyIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * AuthorityKeyIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * AuthorityKeyIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class AuthorityKeyIdentifier
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'keyIdentifier' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + KeyIdentifier::MAP,
+            'authorityCertIssuer' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + GeneralNames::MAP,
+            'authorityCertSerialNumber' => [
+                'constant' => 2,
+                'optional' => true,
+                'implicit' => true
+            ] + CertificateSerialNumber::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BaseDistance.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BaseDistance.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BaseDistance.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * BaseDistance
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * BaseDistance
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BaseDistance
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BasicConstraints.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BasicConstraints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BasicConstraints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * BasicConstraints
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * BasicConstraints
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BasicConstraints
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'cA' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'optional' => true,
+                'default' => false
+            ],
+            'pathLenConstraint' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttribute.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * BuiltInDomainDefinedAttribute
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * BuiltInDomainDefinedAttribute
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BuiltInDomainDefinedAttribute
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'type' => ['type' => ASN1::TYPE_PRINTABLE_STRING],
+            'value' => ['type' => ASN1::TYPE_PRINTABLE_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttributes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInDomainDefinedAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * BuiltInDomainDefinedAttributes
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * BuiltInDomainDefinedAttributes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BuiltInDomainDefinedAttributes
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => 4, // ub-domain-defined-attributes
+        'children' => BuiltInDomainDefinedAttribute::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInStandardAttributes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInStandardAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/BuiltInStandardAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * BuiltInStandardAttributes
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * BuiltInStandardAttributes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BuiltInStandardAttributes
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'country-name' => ['optional' => true] + CountryName::MAP,
+            'administration-domain-name' => ['optional' => true] + AdministrationDomainName::MAP,
+            'network-address' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + NetworkAddress::MAP,
+            'terminal-identifier' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + TerminalIdentifier::MAP,
+            'private-domain-name' => [
+                'constant' => 2,
+                'optional' => true,
+                'explicit' => true
+            ] + PrivateDomainName::MAP,
+            'organization-name' => [
+                'constant' => 3,
+                'optional' => true,
+                'implicit' => true
+            ] + OrganizationName::MAP,
+            'numeric-user-identifier' => [
+                'constant' => 4,
+                'optional' => true,
+                'implicit' => true
+            ] + NumericUserIdentifier::MAP,
+            'personal-name' => [
+                'constant' => 5,
+                'optional' => true,
+                'implicit' => true
+            ] + PersonalName::MAP,
+            'organizational-unit-names' => [
+                'constant' => 6,
+                'optional' => true,
+                'implicit' => true
+            ] + OrganizationalUnitNames::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CPSuri.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CPSuri.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CPSuri.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * CPSuri
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CPSuri
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CPSuri
+{
+    const MAP = ['type' => ASN1::TYPE_IA5_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLDistributionPoints.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLDistributionPoints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLDistributionPoints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * CRLDistributionPoints
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CRLDistributionPoints
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CRLDistributionPoints
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => DistributionPoint::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLNumber.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLNumber.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLNumber.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * CRLNumber
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CRLNumber
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CRLNumber
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLReason.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLReason.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CRLReason.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * CRLReason
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CRLReason
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CRLReason
+{
+    const MAP = [
+        'type' => ASN1::TYPE_ENUMERATED,
+        'mapping' => [
+            'unspecified',
+            'keyCompromise',
+            'cACompromise',
+            'affiliationChanged',
+            'superseded',
+            'cessationOfOperation',
+            'certificateHold',
+            // Value 7 is not used.
+            8 => 'removeFromCRL',
+            'privilegeWithdrawn',
+            'aACompromise'
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertPolicyId.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertPolicyId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertPolicyId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * CertPolicyId
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertPolicyId
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertPolicyId
+{
+    const MAP = ['type' => ASN1::TYPE_OBJECT_IDENTIFIER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Certificate.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Certificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Certificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Certificate
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Certificate
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Certificate
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'tbsCertificate' => TBSCertificate::MAP,
+            'signatureAlgorithm' => AlgorithmIdentifier::MAP,
+            'signature' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateIssuer.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateIssuer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateIssuer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * CertificateIssuer
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+/**
+ * CertificateIssuer
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificateIssuer
+{
+    const MAP = GeneralNames::MAP;
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateList.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateList.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateList.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * CertificateList
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertificateList
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificateList
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'tbsCertList' => TBSCertList::MAP,
+            'signatureAlgorithm' => AlgorithmIdentifier::MAP,
+            'signature' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificatePolicies.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificatePolicies.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificatePolicies.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * CertificatePolicies
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertificatePolicies
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificatePolicies
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => PolicyInformation::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateSerialNumber.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateSerialNumber.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificateSerialNumber.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * CertificateSerialNumber
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertificateSerialNumber
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificateSerialNumber
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequest.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequest.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequest.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * CertificationRequest
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertificationRequest
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificationRequest
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'certificationRequestInfo' => CertificationRequestInfo::MAP,
+            'signatureAlgorithm' => AlgorithmIdentifier::MAP,
+            'signature' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequestInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequestInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CertificationRequestInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * CertificationRequestInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CertificationRequestInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CertificationRequestInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => ['v1']
+            ],
+            'subject' => Name::MAP,
+            'subjectPKInfo' => SubjectPublicKeyInfo::MAP,
+            'attributes' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + Attributes::MAP,
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Characteristic_two.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Characteristic_two.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Characteristic_two.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Characteristic_two
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Characteristic_two
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Characteristic_two
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'm' => ['type' => ASN1::TYPE_INTEGER], // field size 2**m
+            'basis' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'parameters' => [
+                'type' => ASN1::TYPE_ANY,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CountryName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CountryName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/CountryName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * CountryName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * CountryName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class CountryName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        // if class isn't present it's assumed to be \phpseclib3\File\ASN1::CLASS_UNIVERSAL or
+        // (if constant is present) \phpseclib3\File\ASN1::CLASS_CONTEXT_SPECIFIC
+        'class' => ASN1::CLASS_APPLICATION,
+        'cast' => 1,
+        'children' => [
+            'x121-dcc-code' => ['type' => ASN1::TYPE_NUMERIC_STRING],
+            'iso-3166-alpha2-code' => ['type' => ASN1::TYPE_PRINTABLE_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Curve.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Curve.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Curve.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Curve
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Curve
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Curve
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'a' => FieldElement::MAP,
+            'b' => FieldElement::MAP,
+            'seed' => [
+                'type' => ASN1::TYPE_BIT_STRING,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DHParameter.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DHParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DHParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * DHParameter
+ *
+ * From: https://www.teletrust.de/fileadmin/files/oid/oid_pkcs-3v1-4.pdf#page=6
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DHParameter
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DHParameter
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'prime' => ['type' => ASN1::TYPE_INTEGER],
+            'base' => ['type' => ASN1::TYPE_INTEGER],
+            'privateValueLength' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAParams.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAParams.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAParams.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * DSAParams
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DSAParams
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DSAParams
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'p' => ['type' => ASN1::TYPE_INTEGER],
+            'q' => ['type' => ASN1::TYPE_INTEGER],
+            'g' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * DSAPrivateKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DSAPrivateKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DSAPrivateKey
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => ['type' => ASN1::TYPE_INTEGER],
+            'p' => ['type' => ASN1::TYPE_INTEGER],
+            'q' => ['type' => ASN1::TYPE_INTEGER],
+            'g' => ['type' => ASN1::TYPE_INTEGER],
+            'y' => ['type' => ASN1::TYPE_INTEGER],
+            'x' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DSAPublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * DSAPublicKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DSAPublicKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DSAPublicKey
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DigestInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DigestInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DigestInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * DigestInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DigestInfo
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DigestInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'digestAlgorithm' => AlgorithmIdentifier::MAP,
+            'digest' => ['type' => ASN1::TYPE_OCTET_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DirectoryString.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DirectoryString.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DirectoryString.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * DirectoryString
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DirectoryString
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DirectoryString
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'teletexString' => ['type' => ASN1::TYPE_TELETEX_STRING],
+            'printableString' => ['type' => ASN1::TYPE_PRINTABLE_STRING],
+            'universalString' => ['type' => ASN1::TYPE_UNIVERSAL_STRING],
+            'utf8String' => ['type' => ASN1::TYPE_UTF8_STRING],
+            'bmpString' => ['type' => ASN1::TYPE_BMP_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DisplayText.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DisplayText.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DisplayText.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * DisplayText
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DisplayText
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DisplayText
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'ia5String' => ['type' => ASN1::TYPE_IA5_STRING],
+            'visibleString' => ['type' => ASN1::TYPE_VISIBLE_STRING],
+            'bmpString' => ['type' => ASN1::TYPE_BMP_STRING],
+            'utf8String' => ['type' => ASN1::TYPE_UTF8_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPoint.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * DistributionPoint
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DistributionPoint
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DistributionPoint
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'distributionPoint' => [
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true
+            ] + DistributionPointName::MAP,
+            'reasons' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + ReasonFlags::MAP,
+            'cRLIssuer' => [
+                'constant' => 2,
+                'optional' => true,
+                'implicit' => true
+            ] + GeneralNames::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPointName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPointName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DistributionPointName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * DistributionPointName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DistributionPointName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DistributionPointName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'fullName' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + GeneralNames::MAP,
+            'nameRelativeToCRLIssuer' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + RelativeDistinguishedName::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DssSigValue.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DssSigValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/DssSigValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * DssSigValue
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * DssSigValue
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DssSigValue
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'r' => ['type' => ASN1::TYPE_INTEGER],
+            's' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECParameters.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECParameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECParameters.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * ECParameters
+ *
+ * From: https://tools.ietf.org/html/rfc5915
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ECParameters
+ *
+ *  ECParameters ::= CHOICE {
+ *    namedCurve         OBJECT IDENTIFIER
+ *    -- implicitCurve   NULL
+ *    -- specifiedCurve  SpecifiedECDomain
+ *  }
+ *    -- implicitCurve and specifiedCurve MUST NOT be used in PKIX.
+ *    -- Details for SpecifiedECDomain can be found in [X9.62].
+ *    -- Any future additions to this CHOICE should be coordinated
+ *    -- with ANSI X9.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ECParameters
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'namedCurve' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'implicitCurve' => ['type' => ASN1::TYPE_NULL],
+            'specifiedCurve' => SpecifiedECDomain::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPoint.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * ECPoint
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ECPoint
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ECPoint
+{
+    const MAP = ['type' => ASN1::TYPE_OCTET_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ECPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * ECPrivateKey
+ *
+ * From: https://tools.ietf.org/html/rfc5915
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ECPrivateKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ECPrivateKey
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => [1 => 'ecPrivkeyVer1']
+            ],
+            'privateKey' => ['type' => ASN1::TYPE_OCTET_STRING],
+            'parameters' => [
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true
+            ] + ECParameters::MAP,
+            'publicKey' => [
+                'type' => ASN1::TYPE_BIT_STRING,
+                'constant' => 1,
+                'optional' => true,
+                'explicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EDIPartyName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EDIPartyName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EDIPartyName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * EDIPartyName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * EDIPartyName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EDIPartyName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'nameAssigner' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + DirectoryString::MAP,
+            // partyName is technically required but \phpseclib3\File\ASN1 doesn't currently support non-optional constants and
+            // setting it to optional gets the job done in any event.
+            'partyName' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + DirectoryString::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EcdsaSigValue.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EcdsaSigValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EcdsaSigValue.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * EcdsaSigValue
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * EcdsaSigValue
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EcdsaSigValue
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'r' => ['type' => ASN1::TYPE_INTEGER],
+            's' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedData.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedData.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedData.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * EncryptedData
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * EncryptedData
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EncryptedData
+{
+    const MAP = ['type' => ASN1::TYPE_OCTET_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedPrivateKeyInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedPrivateKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/EncryptedPrivateKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * EncryptedPrivateKeyInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * EncryptedPrivateKeyInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EncryptedPrivateKeyInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'encryptionAlgorithm' => AlgorithmIdentifier::MAP,
+            'encryptedData' => EncryptedData::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtKeyUsageSyntax.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtKeyUsageSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtKeyUsageSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * ExtKeyUsageSyntax
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ExtKeyUsageSyntax
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ExtKeyUsageSyntax
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => KeyPurposeId::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extension.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extension.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extension.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * Extension
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Extension
+ *
+ * A certificate using system MUST reject the certificate if it encounters
+ * a critical extension it does not recognize; however, a non-critical
+ * extension may be ignored if it is not recognized.
+ *
+ * http://tools.ietf.org/html/rfc5280#section-4.2
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Extension
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'extnId' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'critical' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'optional' => true,
+                'default' => false
+            ],
+            'extnValue' => ['type' => ASN1::TYPE_OCTET_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttribute.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttribute.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * ExtensionAttribute
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ExtensionAttribute
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ExtensionAttribute
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'extension-attribute-type' => [
+                'type' => ASN1::TYPE_PRINTABLE_STRING,
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'extension-attribute-value' => [
+                'type' => ASN1::TYPE_ANY,
+                'constant' => 1,
+                'optional' => true,
+                'explicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttributes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ExtensionAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * ExtensionAttributes
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ExtensionAttributes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ExtensionAttributes
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SET,
+        'min' => 1,
+        'max' => 256, // ub-extension-attributes
+        'children' => ExtensionAttribute::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extensions.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extensions.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Extensions.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Extensions
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Extensions
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Extensions
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        // technically, it's MAX, but we'll assume anything < 0 is MAX
+        'max' => -1,
+        // if 'children' isn't an array then 'min' and 'max' must be defined
+        'children' => Extension::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldElement.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldElement.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldElement.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * FieldElement
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * FieldElement
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class FieldElement
+{
+    const MAP = ['type' => ASN1::TYPE_OCTET_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldID.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldID.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/FieldID.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * FieldID
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * FieldID
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class FieldID
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'fieldType' => ['type' => ASN1::TYPE_OBJECT_IDENTIFIER],
+            'parameters' => [
+                'type' => ASN1::TYPE_ANY,
+                'optional' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,80 @@
+<?php
+
+/**
+ * GeneralName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * GeneralName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class GeneralName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'otherName' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + AnotherName::MAP,
+            'rfc822Name' => [
+                'type' => ASN1::TYPE_IA5_STRING,
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'dNSName' => [
+                'type' => ASN1::TYPE_IA5_STRING,
+                'constant' => 2,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'x400Address' => [
+                'constant' => 3,
+                'optional' => true,
+                'implicit' => true
+            ] + ORAddress::MAP,
+            'directoryName' => [
+                'constant' => 4,
+                'optional' => true,
+                'explicit' => true
+            ] + Name::MAP,
+            'ediPartyName' => [
+                'constant' => 5,
+                'optional' => true,
+                'implicit' => true
+            ] + EDIPartyName::MAP,
+            'uniformResourceIdentifier' => [
+                'type' => ASN1::TYPE_IA5_STRING,
+                'constant' => 6,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'iPAddress' => [
+                'type' => ASN1::TYPE_OCTET_STRING,
+                'constant' => 7,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'registeredID' => [
+                'type' => ASN1::TYPE_OBJECT_IDENTIFIER,
+                'constant' => 8,
+                'optional' => true,
+                'implicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralNames.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralNames.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralNames.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * GeneralNames
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * GeneralNames
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class GeneralNames
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => GeneralName::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtree.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtree.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtree.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * GeneralSubtree
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * GeneralSubtree
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class GeneralSubtree
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'base' => GeneralName::MAP,
+            'minimum' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true,
+                'default' => '0'
+            ] + BaseDistance::MAP,
+            'maximum' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true,
+            ] + BaseDistance::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtrees.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtrees.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/GeneralSubtrees.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * GeneralSubtrees
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * GeneralSubtrees
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class GeneralSubtrees
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => GeneralSubtree::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HashAlgorithm.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HashAlgorithm.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HashAlgorithm.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * HashAglorithm
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+/**
+ * HashAglorithm
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class HashAlgorithm
+{
+    const MAP = AlgorithmIdentifier::MAP;
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HoldInstructionCode.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HoldInstructionCode.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/HoldInstructionCode.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * HoldInstructionCode
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * HoldInstructionCode
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class HoldInstructionCode
+{
+    const MAP = ['type' => ASN1::TYPE_OBJECT_IDENTIFIER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/InvalidityDate.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/InvalidityDate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/InvalidityDate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * InvalidityDate
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * InvalidityDate
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class InvalidityDate
+{
+    const MAP = ['type' => ASN1::TYPE_GENERALIZED_TIME];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuerAltName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuerAltName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuerAltName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * IssuerAltName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+/**
+ * IssuerAltName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class IssuerAltName
+{
+    const MAP = GeneralNames::MAP;
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuingDistributionPoint.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuingDistributionPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/IssuingDistributionPoint.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * IssuingDistributionPoint
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * IssuingDistributionPoint
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class IssuingDistributionPoint
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'distributionPoint' => [
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true
+            ] + DistributionPointName::MAP,
+            'onlyContainsUserCerts' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'constant' => 1,
+                'optional' => true,
+                'default' => false,
+                'implicit' => true
+            ],
+            'onlyContainsCACerts' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'constant' => 2,
+                'optional' => true,
+                'default' => false,
+                'implicit' => true
+            ],
+            'onlySomeReasons' => [
+                'constant' => 3,
+                'optional' => true,
+                'implicit' => true
+            ] + ReasonFlags::MAP,
+            'indirectCRL' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'constant' => 4,
+                'optional' => true,
+                'default' => false,
+                'implicit' => true
+            ],
+            'onlyContainsAttributeCerts' => [
+                'type' => ASN1::TYPE_BOOLEAN,
+                'constant' => 5,
+                'optional' => true,
+                'default' => false,
+                'implicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * KeyIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * KeyIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class KeyIdentifier
+{
+    const MAP = ['type' => ASN1::TYPE_OCTET_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyPurposeId.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyPurposeId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyPurposeId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * KeyPurposeId
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * KeyPurposeId
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class KeyPurposeId
+{
+    const MAP = ['type' => ASN1::TYPE_OBJECT_IDENTIFIER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyUsage.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyUsage.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/KeyUsage.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * KeyUsage
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * KeyUsage
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class KeyUsage
+{
+    const MAP = [
+        'type' => ASN1::TYPE_BIT_STRING,
+        'mapping' => [
+            'digitalSignature',
+            'nonRepudiation',
+            'keyEncipherment',
+            'dataEncipherment',
+            'keyAgreement',
+            'keyCertSign',
+            'cRLSign',
+            'encipherOnly',
+            'decipherOnly'
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/MaskGenAlgorithm.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/MaskGenAlgorithm.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/MaskGenAlgorithm.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * MaskGenAglorithm
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+/**
+ * MaskGenAglorithm
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class MaskGenAlgorithm
+{
+    const MAP = AlgorithmIdentifier::MAP;
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Name.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Name.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Name.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Name
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Name
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Name
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'rdnSequence' => RDNSequence::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NameConstraints.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NameConstraints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NameConstraints.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * NameConstraints
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * NameConstraints
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class NameConstraints
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'permittedSubtrees' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + GeneralSubtrees::MAP,
+            'excludedSubtrees' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + GeneralSubtrees::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NetworkAddress.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NetworkAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NetworkAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * NetworkAddress
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * NetworkAddress
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class NetworkAddress
+{
+    const MAP = ['type' => ASN1::TYPE_NUMERIC_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NoticeReference.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NoticeReference.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NoticeReference.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * NoticeReference
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * NoticeReference
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class NoticeReference
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'organization' => DisplayText::MAP,
+            'noticeNumbers' => [
+                'type' => ASN1::TYPE_SEQUENCE,
+                'min' => 1,
+                'max' => 200,
+                'children' => ['type' => ASN1::TYPE_INTEGER]
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NumericUserIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NumericUserIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/NumericUserIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * NumericUserIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * NumericUserIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class NumericUserIdentifier
+{
+    const MAP = ['type' => ASN1::TYPE_NUMERIC_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ORAddress.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ORAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ORAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * ORAddress
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ORAddress
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ORAddress
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'built-in-standard-attributes' => BuiltInStandardAttributes::MAP,
+            'built-in-domain-defined-attributes' => ['optional' => true] + BuiltInDomainDefinedAttributes::MAP,
+            'extension-attributes' => ['optional' => true] + ExtensionAttributes::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OneAsymmetricKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OneAsymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OneAsymmetricKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * OneAsymmetricKey
+ *
+ * See https://tools.ietf.org/html/rfc5958
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * OneAsymmetricKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OneAsymmetricKey
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => ['v1', 'v2']
+            ],
+            'privateKeyAlgorithm' => AlgorithmIdentifier::MAP,
+            'privateKey' => PrivateKey::MAP,
+            'attributes' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + Attributes::MAP,
+            'publicKey' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + PublicKey::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * OrganizationName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * OrganizationName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OrganizationName
+{
+    const MAP = ['type' => ASN1::TYPE_PRINTABLE_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationalUnitNames.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationalUnitNames.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OrganizationalUnitNames.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * OrganizationalUnitNames
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * OrganizationalUnitNames
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OrganizationalUnitNames
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => 4, // ub-organizational-units
+        'children' => ['type' => ASN1::TYPE_PRINTABLE_STRING]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * OtherPrimeInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * OtherPrimeInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OtherPrimeInfo
+{
+    // version must be multi if otherPrimeInfos present
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'prime' => ['type' => ASN1::TYPE_INTEGER],      // ri
+            'exponent' => ['type' => ASN1::TYPE_INTEGER],   // di
+            'coefficient' => ['type' => ASN1::TYPE_INTEGER] // ti
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfos.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfos.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/OtherPrimeInfos.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * OtherPrimeInfos
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * OtherPrimeInfos
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OtherPrimeInfos
+{
+    // version must be multi if otherPrimeInfos present
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => OtherPrimeInfo::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBEParameter.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBEParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBEParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * PBEParameter
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PBEParameter
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PBEParameter
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'salt' => ['type' => ASN1::TYPE_OCTET_STRING],
+            'iterationCount' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBES2params.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBES2params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBES2params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * PBES2params
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PBES2params
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PBES2params
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'keyDerivationFunc' => AlgorithmIdentifier::MAP,
+            'encryptionScheme' => AlgorithmIdentifier::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBKDF2params.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBKDF2params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBKDF2params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * PBKDF2params
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PBKDF2params
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PBKDF2params
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            // technically, this is a CHOICE in RFC2898 but the other "choice" is, currently, more of a placeholder
+            // in the RFC
+            'salt' => ['type' => ASN1::TYPE_OCTET_STRING],
+            'iterationCount' => ['type' => ASN1::TYPE_INTEGER],
+            'keyLength' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'optional' => true
+            ],
+            'prf' => AlgorithmIdentifier::MAP + ['optional' => true]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBMAC1params.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBMAC1params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PBMAC1params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * PBMAC1params
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PBMAC1params
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PBMAC1params
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'keyDerivationFunc' => AlgorithmIdentifier::MAP,
+            'messageAuthScheme' => AlgorithmIdentifier::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PKCS9String.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PKCS9String.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PKCS9String.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PKCS9String
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PKCS9String
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PKCS9String
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'ia5String' => ['type' => ASN1::TYPE_IA5_STRING],
+            'directoryString' => DirectoryString::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Pentanomial.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Pentanomial.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Pentanomial.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Pentanomial
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Pentanomial
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Pentanomial
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'k1' => ['type' => ASN1::TYPE_INTEGER], // k1 > 0
+            'k2' => ['type' => ASN1::TYPE_INTEGER], // k2 > k1
+            'k3' => ['type' => ASN1::TYPE_INTEGER], // k3 > h2
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PersonalName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PersonalName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PersonalName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * PersonalName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PersonalName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PersonalName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SET,
+        'children' => [
+            'surname' => [
+                'type' => ASN1::TYPE_PRINTABLE_STRING,
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'given-name' => [
+                'type' => ASN1::TYPE_PRINTABLE_STRING,
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'initials' => [
+                'type' => ASN1::TYPE_PRINTABLE_STRING,
+                'constant' => 2,
+                'optional' => true,
+                'implicit' => true
+            ],
+            'generation-qualifier' => [
+                'type' => ASN1::TYPE_PRINTABLE_STRING,
+                'constant' => 3,
+                'optional' => true,
+                'implicit' => true
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyInformation.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyInformation.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyInformation.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * PolicyInformation
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PolicyInformation
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PolicyInformation
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'policyIdentifier' => CertPolicyId::MAP,
+            'policyQualifiers' => [
+                'type' => ASN1::TYPE_SEQUENCE,
+                'min' => 0,
+                'max' => -1,
+                'optional' => true,
+                'children' => PolicyQualifierInfo::MAP
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyMappings.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyMappings.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyMappings.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * PolicyMappings
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PolicyMappings
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PolicyMappings
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => [
+            'type' => ASN1::TYPE_SEQUENCE,
+            'children' => [
+                'issuerDomainPolicy' => CertPolicyId::MAP,
+                'subjectDomainPolicy' => CertPolicyId::MAP
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierId.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierId.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * PolicyQualifierId
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PolicyQualifierId
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PolicyQualifierId
+{
+    const MAP = ['type' => ASN1::TYPE_OBJECT_IDENTIFIER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PolicyQualifierInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PolicyQualifierInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PolicyQualifierInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PolicyQualifierInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'policyQualifierId' => PolicyQualifierId::MAP,
+            'qualifier' => ['type' => ASN1::TYPE_ANY]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PostalAddress.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PostalAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PostalAddress.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PostalAddress
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PostalAddress
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PostalAddress
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'optional' => true,
+        'min' => 1,
+        'max' => -1,
+        'children' => DirectoryString::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Prime_p.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Prime_p.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Prime_p.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Prime_p
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Prime_p
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Prime_p
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateDomainName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateDomainName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateDomainName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PrivateDomainName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PrivateDomainName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PrivateDomainName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'numeric' => ['type' => ASN1::TYPE_NUMERIC_STRING],
+            'printable' => ['type' => ASN1::TYPE_PRINTABLE_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * PrivateKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PrivateKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PrivateKey
+{
+    const MAP = ['type' => ASN1::TYPE_OCTET_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * PrivateKeyInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PrivateKeyInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PrivateKeyInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => ['v1']
+            ],
+            'privateKeyAlgorithm' => AlgorithmIdentifier::MAP,
+            'privateKey' => PrivateKey::MAP,
+            'attributes' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true
+            ] + Attributes::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyUsagePeriod.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyUsagePeriod.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PrivateKeyUsagePeriod.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * PrivateKeyUsagePeriod
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PrivateKeyUsagePeriod
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PrivateKeyUsagePeriod
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'notBefore' => [
+                'constant' => 0,
+                'optional' => true,
+                'implicit' => true,
+                'type' => ASN1::TYPE_GENERALIZED_TIME],
+            'notAfter' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true,
+                'type' => ASN1::TYPE_GENERALIZED_TIME]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * PublicKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PublicKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PublicKey
+{
+    const MAP = ['type' => ASN1::TYPE_BIT_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyAndChallenge.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyAndChallenge.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyAndChallenge.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PublicKeyAndChallenge
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PublicKeyAndChallenge
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PublicKeyAndChallenge
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'spki' => SubjectPublicKeyInfo::MAP,
+            'challenge' => ['type' => ASN1::TYPE_IA5_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/PublicKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * PublicKeyInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * PublicKeyInfo
+ *
+ * this format is not formally defined anywhere but is none-the-less the form you
+ * get when you do "openssl rsa -in private.pem -outform PEM -pubout"
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PublicKeyInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'publicKeyAlgorithm' => AlgorithmIdentifier::MAP,
+            'publicKey' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RC2CBCParameter.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RC2CBCParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RC2CBCParameter.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * RC2CBCParameter
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RC2CBCParameter
+ *
+ * from https://tools.ietf.org/html/rfc2898#appendix-A.3
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RC2CBCParameter
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'rc2ParametersVersion' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'optional' => true
+            ],
+            'iv' => ['type' => ASN1::TYPE_OCTET_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RDNSequence.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RDNSequence.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RDNSequence.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * RDNSequence
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RDNSequence
+ *
+ * In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare,
+ * but they can be useful at times when either there is no unique attribute in the entry or you
+ * want to ensure that the entry's DN contains some useful identifying information.
+ *
+ * - https://www.opends.org/wiki/page/DefinitionRelativeDistinguishedName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RDNSequence
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        // RDNSequence does not define a min or a max, which means it doesn't have one
+        'min' => 0,
+        'max' => -1,
+        'children' => RelativeDistinguishedName::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPrivateKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPrivateKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * RSAPrivateKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RSAPrivateKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RSAPrivateKey
+{
+    // version must be multi if otherPrimeInfos present
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => ['two-prime', 'multi']
+            ],
+            'modulus' => ['type' => ASN1::TYPE_INTEGER],         // n
+            'publicExponent' => ['type' => ASN1::TYPE_INTEGER],  // e
+            'privateExponent' => ['type' => ASN1::TYPE_INTEGER], // d
+            'prime1' => ['type' => ASN1::TYPE_INTEGER],          // p
+            'prime2' => ['type' => ASN1::TYPE_INTEGER],          // q
+            'exponent1' => ['type' => ASN1::TYPE_INTEGER],       // d mod (p-1)
+            'exponent2' => ['type' => ASN1::TYPE_INTEGER],       // d mod (q-1)
+            'coefficient' => ['type' => ASN1::TYPE_INTEGER],     // (inverse of q) mod p
+            'otherPrimeInfos' => OtherPrimeInfos::MAP + ['optional' => true]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPublicKey.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSAPublicKey.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * RSAPublicKey
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RSAPublicKey
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RSAPublicKey
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'modulus' => ['type' => ASN1::TYPE_INTEGER],
+            'publicExponent' => ['type' => ASN1::TYPE_INTEGER]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSASSA_PSS_params.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSASSA_PSS_params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RSASSA_PSS_params.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * RSASSA_PSS_params
+ *
+ * As defined in https://tools.ietf.org/html/rfc4055#section-3.1
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RSASSA_PSS_params
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RSASSA_PSS_params
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'hashAlgorithm' => [
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true,
+                //'default'  => 'sha1Identifier'
+            ] + HashAlgorithm::MAP,
+            'maskGenAlgorithm' => [
+                'constant' => 1,
+                'optional' => true,
+                'explicit' => true,
+                //'default'  => 'mgf1SHA1Identifier'
+            ] + MaskGenAlgorithm::MAP,
+            'saltLength' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'constant' => 2,
+                'optional' => true,
+                'explicit' => true,
+                'default' => 20
+            ],
+            'trailerField' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'constant' => 3,
+                'optional' => true,
+                'explicit' => true,
+                'default' => 1
+            ]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ReasonFlags.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ReasonFlags.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/ReasonFlags.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * ReasonFlags
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * ReasonFlags
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class ReasonFlags
+{
+    const MAP = [
+        'type' => ASN1::TYPE_BIT_STRING,
+        'mapping' => [
+            'unused',
+            'keyCompromise',
+            'cACompromise',
+            'affiliationChanged',
+            'superseded',
+            'cessationOfOperation',
+            'certificateHold',
+            'privilegeWithdrawn',
+            'aACompromise'
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RelativeDistinguishedName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RelativeDistinguishedName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RelativeDistinguishedName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * RelativeDistinguishedName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RelativeDistinguishedName
+ *
+ * In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare,
+ * but they can be useful at times when either there is no unique attribute in the entry or you
+ * want to ensure that the entry's DN contains some useful identifying information.
+ *
+ * - https://www.opends.org/wiki/page/DefinitionRelativeDistinguishedName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RelativeDistinguishedName
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SET,
+        'min' => 1,
+        'max' => -1,
+        'children' => AttributeTypeAndValue::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RevokedCertificate.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RevokedCertificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/RevokedCertificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * RevokedCertificate
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * RevokedCertificate
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class RevokedCertificate
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'userCertificate' => CertificateSerialNumber::MAP,
+            'revocationDate' => Time::MAP,
+            'crlEntryExtensions' => [
+                'optional' => true
+            ] + Extensions::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SignedPublicKeyAndChallenge.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SignedPublicKeyAndChallenge.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SignedPublicKeyAndChallenge.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * SignedPublicKeyAndChallenge
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * SignedPublicKeyAndChallenge
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SignedPublicKeyAndChallenge
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'publicKeyAndChallenge' => PublicKeyAndChallenge::MAP,
+            'signatureAlgorithm' => AlgorithmIdentifier::MAP,
+            'signature' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SpecifiedECDomain.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SpecifiedECDomain.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SpecifiedECDomain.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * SpecifiedECDomain
+ *
+ * From: http://www.secg.org/sec1-v2.pdf#page=109
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * SpecifiedECDomain
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SpecifiedECDomain
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => [1 => 'ecdpVer1', 'ecdpVer2', 'ecdpVer3']
+            ],
+            'fieldID' => FieldID::MAP,
+            'curve' => Curve::MAP,
+            'base' => ECPoint::MAP,
+            'order' => ['type' => ASN1::TYPE_INTEGER],
+            'cofactor' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'optional' => true
+            ],
+            'hash' => ['optional' => true] + HashAlgorithm::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectAltName.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectAltName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectAltName.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * SubjectAltName
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+/**
+ * SubjectAltName
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SubjectAltName
+{
+    const MAP = GeneralNames::MAP;
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectDirectoryAttributes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectDirectoryAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectDirectoryAttributes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * SubjectDirectoryAttributes
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * SubjectDirectoryAttributes
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SubjectDirectoryAttributes
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => Attribute::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectInfoAccessSyntax.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectInfoAccessSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectInfoAccessSyntax.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * SubjectInfoAccessSyntax
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * SubjectInfoAccessSyntax
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SubjectInfoAccessSyntax
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'min' => 1,
+        'max' => -1,
+        'children' => AccessDescription::MAP
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectPublicKeyInfo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectPublicKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/SubjectPublicKeyInfo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * SubjectPublicKeyInfo
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * SubjectPublicKeyInfo
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class SubjectPublicKeyInfo
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'algorithm' => AlgorithmIdentifier::MAP,
+            'subjectPublicKey' => ['type' => ASN1::TYPE_BIT_STRING]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertList.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertList.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertList.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * TBSCertList
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * TBSCertList
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class TBSCertList
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'mapping' => ['v1', 'v2'],
+                'optional' => true,
+                'default' => 'v1'
+            ],
+            'signature' => AlgorithmIdentifier::MAP,
+            'issuer' => Name::MAP,
+            'thisUpdate' => Time::MAP,
+            'nextUpdate' => [
+                'optional' => true
+            ] + Time::MAP,
+            'revokedCertificates' => [
+                'type' => ASN1::TYPE_SEQUENCE,
+                'optional' => true,
+                'min' => 0,
+                'max' => -1,
+                'children' => RevokedCertificate::MAP
+            ],
+            'crlExtensions' => [
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true
+            ] + Extensions::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertificate.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TBSCertificate.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * TBSCertificate
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * TBSCertificate
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class TBSCertificate
+{
+    // assert($TBSCertificate['children']['signature'] == $Certificate['children']['signatureAlgorithm'])
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            // technically, default implies optional, but we'll define it as being optional, none-the-less, just to
+            // reenforce that fact
+            'version' => [
+                'type' => ASN1::TYPE_INTEGER,
+                'constant' => 0,
+                'optional' => true,
+                'explicit' => true,
+                'mapping' => ['v1', 'v2', 'v3'],
+                'default' => 'v1'
+            ],
+            'serialNumber' => CertificateSerialNumber::MAP,
+            'signature' => AlgorithmIdentifier::MAP,
+            'issuer' => Name::MAP,
+            'validity' => Validity::MAP,
+            'subject' => Name::MAP,
+            'subjectPublicKeyInfo' => SubjectPublicKeyInfo::MAP,
+            // implicit means that the T in the TLV structure is to be rewritten, regardless of the type
+            'issuerUniqueID' => [
+                'constant' => 1,
+                'optional' => true,
+                'implicit' => true
+            ] + UniqueIdentifier::MAP,
+            'subjectUniqueID' => [
+                'constant' => 2,
+                'optional' => true,
+                'implicit' => true
+            ] + UniqueIdentifier::MAP,
+            // <http://tools.ietf.org/html/rfc2459#page-74> doesn't use the EXPLICIT keyword but if
+            // it's not IMPLICIT, it's EXPLICIT
+            'extensions' => [
+                'constant' => 3,
+                'optional' => true,
+                'explicit' => true
+            ] + Extensions::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TerminalIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TerminalIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/TerminalIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * TerminalIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * TerminalIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class TerminalIdentifier
+{
+    const MAP = ['type' => ASN1::TYPE_PRINTABLE_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Time.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Time.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Time.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Time
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Time
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Time
+{
+    const MAP = [
+        'type' => ASN1::TYPE_CHOICE,
+        'children' => [
+            'utcTime' => ['type' => ASN1::TYPE_UTC_TIME],
+            'generalTime' => ['type' => ASN1::TYPE_GENERALIZED_TIME]
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Trinomial.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Trinomial.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Trinomial.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Trinomial
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Trinomial
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Trinomial
+{
+    const MAP = ['type' => ASN1::TYPE_INTEGER];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UniqueIdentifier.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UniqueIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UniqueIdentifier.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * UniqueIdentifier
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * UniqueIdentifier
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class UniqueIdentifier
+{
+    const MAP = ['type' => ASN1::TYPE_BIT_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UserNotice.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UserNotice.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/UserNotice.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * UserNotice
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * UserNotice
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class UserNotice
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'noticeRef' => [
+                'optional' => true,
+                'implicit' => true
+            ] + NoticeReference::MAP,
+            'explicitText' => [
+                'optional' => true,
+                'implicit' => true
+            ] + DisplayText::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Validity.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Validity.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/Validity.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Validity
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * Validity
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Validity
+{
+    const MAP = [
+        'type' => ASN1::TYPE_SEQUENCE,
+        'children' => [
+            'notBefore' => Time::MAP,
+            'notAfter' => Time::MAP
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_ca_policy_url.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_ca_policy_url.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_ca_policy_url.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * netscape_ca_policy_url
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * netscape_ca_policy_url
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class netscape_ca_policy_url
+{
+    const MAP = ['type' => ASN1::TYPE_IA5_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_cert_type.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_cert_type.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_cert_type.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * netscape_cert_type
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * netscape_cert_type
+ *
+ * mapping is from <http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html>
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class netscape_cert_type
+{
+    const MAP = [
+        'type' => ASN1::TYPE_BIT_STRING,
+        'mapping' => [
+            'SSLClient',
+            'SSLServer',
+            'Email',
+            'ObjectSigning',
+            'Reserved',
+            'SSLCA',
+            'EmailCA',
+            'ObjectSigningCA'
+        ]
+    ];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_comment.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_comment.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/ASN1/Maps/netscape_comment.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * netscape_comment
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2016 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File\ASN1\Maps;
+
+use phpseclib3\File\ASN1;
+
+/**
+ * netscape_comment
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class netscape_comment
+{
+    const MAP = ['type' => ASN1::TYPE_IA5_STRING];
+}
Index: vendor/phpseclib/phpseclib/phpseclib/File/X509.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/File/X509.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/File/X509.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,4006 @@
+<?php
+
+/**
+ * Pure-PHP X.509 Parser
+ *
+ * PHP version 5
+ *
+ * Encode and decode X.509 certificates.
+ *
+ * The extensions are from {@link http://tools.ietf.org/html/rfc5280 RFC5280} and
+ * {@link http://web.archive.org/web/19961027104704/http://www3.netscape.com/eng/security/cert-exts.html Netscape Certificate Extensions}.
+ *
+ * Note that loading an X.509 certificate and resaving it may invalidate the signature.  The reason being that the signature is based on a
+ * portion of the certificate that contains optional parameters with default values.  ie. if the parameter isn't there the default value is
+ * used.  Problem is, if the parameter is there and it just so happens to have the default value there are two ways that that parameter can
+ * be encoded.  It can be encoded explicitly or left out all together.  This would effect the signature value and thus may invalidate the
+ * the certificate all together unless the certificate is re-signed.
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\File;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\PrivateKey;
+use phpseclib3\Crypt\Common\PublicKey;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\EC;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\PublicKeyLoader;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Crypt\RSA\Formats\Keys\PSS;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\File\ASN1\Element;
+use phpseclib3\File\ASN1\Maps;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Pure-PHP X.509 Parser
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class X509
+{
+    /**
+     * Flag to only accept signatures signed by certificate authorities
+     *
+     * Not really used anymore but retained all the same to suppress E_NOTICEs from old installs
+     *
+     */
+    const VALIDATE_SIGNATURE_BY_CA = 1;
+
+    /**
+     * Return internal array representation
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_ARRAY = 0;
+    /**
+     * Return string
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_STRING = 1;
+    /**
+     * Return ASN.1 name string
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_ASN1 = 2;
+    /**
+     * Return OpenSSL compatible array
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_OPENSSL = 3;
+    /**
+     * Return canonical ASN.1 RDNs string
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_CANON = 4;
+    /**
+     * Return name hash for file indexing
+     *
+     * @see \phpseclib3\File\X509::getDN()
+     */
+    const DN_HASH = 5;
+
+    /**
+     * Save as PEM
+     *
+     * ie. a base64-encoded PEM with a header and a footer
+     *
+     * @see \phpseclib3\File\X509::saveX509()
+     * @see \phpseclib3\File\X509::saveCSR()
+     * @see \phpseclib3\File\X509::saveCRL()
+     */
+    const FORMAT_PEM = 0;
+    /**
+     * Save as DER
+     *
+     * @see \phpseclib3\File\X509::saveX509()
+     * @see \phpseclib3\File\X509::saveCSR()
+     * @see \phpseclib3\File\X509::saveCRL()
+     */
+    const FORMAT_DER = 1;
+    /**
+     * Save as a SPKAC
+     *
+     * @see \phpseclib3\File\X509::saveX509()
+     * @see \phpseclib3\File\X509::saveCSR()
+     * @see \phpseclib3\File\X509::saveCRL()
+     *
+     * Only works on CSRs. Not currently supported.
+     */
+    const FORMAT_SPKAC = 2;
+    /**
+     * Auto-detect the format
+     *
+     * Used only by the load*() functions
+     *
+     * @see \phpseclib3\File\X509::saveX509()
+     * @see \phpseclib3\File\X509::saveCSR()
+     * @see \phpseclib3\File\X509::saveCRL()
+     */
+    const FORMAT_AUTO_DETECT = 3;
+
+    /**
+     * Attribute value disposition.
+     * If disposition is >= 0, this is the index of the target value.
+     */
+    const ATTR_ALL = -1; // All attribute values (array).
+    const ATTR_APPEND = -2; // Add a value.
+    const ATTR_REPLACE = -3; // Clear first, then add a value.
+
+    /**
+     * Distinguished Name
+     *
+     * @var array
+     */
+    private $dn;
+
+    /**
+     * Public key
+     *
+     * @var string|PublicKey
+     */
+    private $publicKey;
+
+    /**
+     * Private key
+     *
+     * @var string|PrivateKey
+     */
+    private $privateKey;
+
+    /**
+     * The certificate authorities
+     *
+     * @var array
+     */
+    private $CAs = [];
+
+    /**
+     * The currently loaded certificate
+     *
+     * @var array
+     */
+    private $currentCert;
+
+    /**
+     * The signature subject
+     *
+     * There's no guarantee \phpseclib3\File\X509 is going to re-encode an X.509 cert in the same way it was originally
+     * encoded so we take save the portion of the original cert that the signature would have made for.
+     *
+     * @var string
+     */
+    private $signatureSubject;
+
+    /**
+     * Certificate Start Date
+     *
+     * @var string
+     */
+    private $startDate;
+
+    /**
+     * Certificate End Date
+     *
+     * @var string|Element
+     */
+    private $endDate;
+
+    /**
+     * Serial Number
+     *
+     * @var string
+     */
+    private $serialNumber;
+
+    /**
+     * Key Identifier
+     *
+     * See {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.1 RFC5280#section-4.2.1.1} and
+     * {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.2 RFC5280#section-4.2.1.2}.
+     *
+     * @var string
+     */
+    private $currentKeyIdentifier;
+
+    /**
+     * CA Flag
+     *
+     * @var bool
+     */
+    private $caFlag = false;
+
+    /**
+     * SPKAC Challenge
+     *
+     * @var string
+     */
+    private $challenge;
+
+    /**
+     * @var array
+     */
+    private $extensionValues = [];
+
+    /**
+     * OIDs loaded
+     *
+     * @var bool
+     */
+    private static $oidsLoaded = false;
+
+    /**
+     * Recursion Limit
+     *
+     * @var int
+     */
+    private static $recur_limit = 5;
+
+    /**
+     * URL fetch flag
+     *
+     * @var bool
+     */
+    private static $disable_url_fetch = false;
+
+    /**
+     * @var array
+     */
+    private static $extensions = [];
+
+    /**
+     * @var ?array
+     */
+    private $ipAddresses = null;
+
+    /**
+     * @var ?array
+     */
+    private $domains = null;
+
+    /**
+     * Default Constructor.
+     *
+     * @return X509
+     */
+    public function __construct()
+    {
+        // Explicitly Tagged Module, 1988 Syntax
+        // http://tools.ietf.org/html/rfc5280#appendix-A.1
+
+        if (!self::$oidsLoaded) {
+            // OIDs from RFC5280 and those RFCs mentioned in RFC5280#section-4.1.1.2
+            ASN1::loadOIDs([
+                //'id-pkix' => '1.3.6.1.5.5.7',
+                //'id-pe' => '1.3.6.1.5.5.7.1',
+                //'id-qt' => '1.3.6.1.5.5.7.2',
+                //'id-kp' => '1.3.6.1.5.5.7.3',
+                //'id-ad' => '1.3.6.1.5.5.7.48',
+                'id-qt-cps' => '1.3.6.1.5.5.7.2.1',
+                'id-qt-unotice' => '1.3.6.1.5.5.7.2.2',
+                'id-ad-ocsp' => '1.3.6.1.5.5.7.48.1',
+                'id-ad-caIssuers' => '1.3.6.1.5.5.7.48.2',
+                'id-ad-timeStamping' => '1.3.6.1.5.5.7.48.3',
+                'id-ad-caRepository' => '1.3.6.1.5.5.7.48.5',
+                //'id-at' => '2.5.4',
+                'id-at-name' => '2.5.4.41',
+                'id-at-surname' => '2.5.4.4',
+                'id-at-givenName' => '2.5.4.42',
+                'id-at-initials' => '2.5.4.43',
+                'id-at-generationQualifier' => '2.5.4.44',
+                'id-at-commonName' => '2.5.4.3',
+                'id-at-localityName' => '2.5.4.7',
+                'id-at-stateOrProvinceName' => '2.5.4.8',
+                'id-at-organizationName' => '2.5.4.10',
+                'id-at-organizationalUnitName' => '2.5.4.11',
+                'id-at-title' => '2.5.4.12',
+                'id-at-description' => '2.5.4.13',
+                'id-at-dnQualifier' => '2.5.4.46',
+                'id-at-countryName' => '2.5.4.6',
+                'id-at-serialNumber' => '2.5.4.5',
+                'id-at-pseudonym' => '2.5.4.65',
+                'id-at-postalCode' => '2.5.4.17',
+                'id-at-streetAddress' => '2.5.4.9',
+                'id-at-uniqueIdentifier' => '2.5.4.45',
+                'id-at-role' => '2.5.4.72',
+                'id-at-postalAddress' => '2.5.4.16',
+                'jurisdictionOfIncorporationCountryName' => '1.3.6.1.4.1.311.60.2.1.3',
+                'jurisdictionOfIncorporationStateOrProvinceName' => '1.3.6.1.4.1.311.60.2.1.2',
+                'jurisdictionLocalityName' => '1.3.6.1.4.1.311.60.2.1.1',
+                'id-at-businessCategory' => '2.5.4.15',
+
+                //'id-domainComponent' => '0.9.2342.19200300.100.1.25',
+                //'pkcs-9' => '1.2.840.113549.1.9',
+                'pkcs-9-at-emailAddress' => '1.2.840.113549.1.9.1',
+                //'id-ce' => '2.5.29',
+                'id-ce-authorityKeyIdentifier' => '2.5.29.35',
+                'id-ce-subjectKeyIdentifier' => '2.5.29.14',
+                'id-ce-keyUsage' => '2.5.29.15',
+                'id-ce-privateKeyUsagePeriod' => '2.5.29.16',
+                'id-ce-certificatePolicies' => '2.5.29.32',
+                //'anyPolicy' => '2.5.29.32.0',
+
+                'id-ce-policyMappings' => '2.5.29.33',
+
+                'id-ce-subjectAltName' => '2.5.29.17',
+                'id-ce-issuerAltName' => '2.5.29.18',
+                'id-ce-subjectDirectoryAttributes' => '2.5.29.9',
+                'id-ce-basicConstraints' => '2.5.29.19',
+                'id-ce-nameConstraints' => '2.5.29.30',
+                'id-ce-policyConstraints' => '2.5.29.36',
+                'id-ce-cRLDistributionPoints' => '2.5.29.31',
+                'id-ce-extKeyUsage' => '2.5.29.37',
+                //'anyExtendedKeyUsage' => '2.5.29.37.0',
+                'id-kp-serverAuth' => '1.3.6.1.5.5.7.3.1',
+                'id-kp-clientAuth' => '1.3.6.1.5.5.7.3.2',
+                'id-kp-codeSigning' => '1.3.6.1.5.5.7.3.3',
+                'id-kp-emailProtection' => '1.3.6.1.5.5.7.3.4',
+                'id-kp-timeStamping' => '1.3.6.1.5.5.7.3.8',
+                'id-kp-OCSPSigning' => '1.3.6.1.5.5.7.3.9',
+                'id-ce-inhibitAnyPolicy' => '2.5.29.54',
+                'id-ce-freshestCRL' => '2.5.29.46',
+                'id-pe-authorityInfoAccess' => '1.3.6.1.5.5.7.1.1',
+                'id-pe-subjectInfoAccess' => '1.3.6.1.5.5.7.1.11',
+                'id-ce-cRLNumber' => '2.5.29.20',
+                'id-ce-issuingDistributionPoint' => '2.5.29.28',
+                'id-ce-deltaCRLIndicator' => '2.5.29.27',
+                'id-ce-cRLReasons' => '2.5.29.21',
+                'id-ce-certificateIssuer' => '2.5.29.29',
+                'id-ce-holdInstructionCode' => '2.5.29.23',
+                //'holdInstruction' => '1.2.840.10040.2',
+                'id-holdinstruction-none' => '1.2.840.10040.2.1',
+                'id-holdinstruction-callissuer' => '1.2.840.10040.2.2',
+                'id-holdinstruction-reject' => '1.2.840.10040.2.3',
+                'id-ce-invalidityDate' => '2.5.29.24',
+
+                'rsaEncryption' => '1.2.840.113549.1.1.1',
+                'md2WithRSAEncryption' => '1.2.840.113549.1.1.2',
+                'md5WithRSAEncryption' => '1.2.840.113549.1.1.4',
+                'sha1WithRSAEncryption' => '1.2.840.113549.1.1.5',
+                'sha224WithRSAEncryption' => '1.2.840.113549.1.1.14',
+                'sha256WithRSAEncryption' => '1.2.840.113549.1.1.11',
+                'sha384WithRSAEncryption' => '1.2.840.113549.1.1.12',
+                'sha512WithRSAEncryption' => '1.2.840.113549.1.1.13',
+
+                'id-ecPublicKey' => '1.2.840.10045.2.1',
+                'ecdsa-with-SHA1' => '1.2.840.10045.4.1',
+                // from https://tools.ietf.org/html/rfc5758#section-3.2
+                'ecdsa-with-SHA224' => '1.2.840.10045.4.3.1',
+                'ecdsa-with-SHA256' => '1.2.840.10045.4.3.2',
+                'ecdsa-with-SHA384' => '1.2.840.10045.4.3.3',
+                'ecdsa-with-SHA512' => '1.2.840.10045.4.3.4',
+
+                'id-dsa' => '1.2.840.10040.4.1',
+                'id-dsa-with-sha1' => '1.2.840.10040.4.3',
+                // from https://tools.ietf.org/html/rfc5758#section-3.1
+                'id-dsa-with-sha224' => '2.16.840.1.101.3.4.3.1',
+                'id-dsa-with-sha256' => '2.16.840.1.101.3.4.3.2',
+
+                // from https://tools.ietf.org/html/rfc8410:
+                'id-Ed25519' => '1.3.101.112',
+                'id-Ed448' => '1.3.101.113',
+
+                'id-RSASSA-PSS' => '1.2.840.113549.1.1.10',
+
+                //'id-sha224' => '2.16.840.1.101.3.4.2.4',
+                //'id-sha256' => '2.16.840.1.101.3.4.2.1',
+                //'id-sha384' => '2.16.840.1.101.3.4.2.2',
+                //'id-sha512' => '2.16.840.1.101.3.4.2.3',
+                //'id-GostR3411-94-with-GostR3410-94' => '1.2.643.2.2.4',
+                //'id-GostR3411-94-with-GostR3410-2001' => '1.2.643.2.2.3',
+                //'id-GostR3410-2001' => '1.2.643.2.2.20',
+                //'id-GostR3410-94' => '1.2.643.2.2.19',
+                // Netscape Object Identifiers from "Netscape Certificate Extensions"
+                'netscape' => '2.16.840.1.113730',
+                'netscape-cert-extension' => '2.16.840.1.113730.1',
+                'netscape-cert-type' => '2.16.840.1.113730.1.1',
+                'netscape-comment' => '2.16.840.1.113730.1.13',
+                'netscape-ca-policy-url' => '2.16.840.1.113730.1.8',
+                // the following are X.509 extensions not supported by phpseclib
+                'id-pe-logotype' => '1.3.6.1.5.5.7.1.12',
+                'entrustVersInfo' => '1.2.840.113533.7.65.0',
+                'verisignPrivate' => '2.16.840.1.113733.1.6.9',
+                // for Certificate Signing Requests
+                // see http://tools.ietf.org/html/rfc2985
+                'pkcs-9-at-unstructuredName' => '1.2.840.113549.1.9.2', // PKCS #9 unstructured name
+                'pkcs-9-at-challengePassword' => '1.2.840.113549.1.9.7', // Challenge password for certificate revocations
+                'pkcs-9-at-extensionRequest' => '1.2.840.113549.1.9.14' // Certificate extension request
+            ]);
+        }
+    }
+
+    /**
+     * Load X.509 certificate
+     *
+     * Returns an associative array describing the X.509 cert or a false if the cert failed to load
+     *
+     * @param array|string $cert
+     * @param int $mode
+     * @return mixed
+     */
+    public function loadX509($cert, $mode = self::FORMAT_AUTO_DETECT)
+    {
+        if (is_array($cert) && isset($cert['tbsCertificate'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            $this->dn = $cert['tbsCertificate']['subject'];
+            if (!isset($this->dn)) {
+                return false;
+            }
+            $this->currentCert = $cert;
+
+            $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
+            $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;
+
+            unset($this->signatureSubject);
+
+            return $cert;
+        }
+
+        if ($mode != self::FORMAT_DER) {
+            $newcert = ASN1::extractBER($cert);
+            if ($mode == self::FORMAT_PEM && $cert == $newcert) {
+                return false;
+            }
+            $cert = $newcert;
+        }
+
+        if ($cert === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $decoded = ASN1::decodeBER($cert);
+
+        if ($decoded) {
+            $x509 = ASN1::asn1map($decoded[0], Maps\Certificate::MAP);
+        }
+        if (!isset($x509) || $x509 === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($cert, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        if ($this->isSubArrayValid($x509, 'tbsCertificate/extensions')) {
+            $this->mapInExtensions($x509, 'tbsCertificate/extensions');
+        }
+        $this->mapInDNs($x509, 'tbsCertificate/issuer/rdnSequence');
+        $this->mapInDNs($x509, 'tbsCertificate/subject/rdnSequence');
+
+        $key = $x509['tbsCertificate']['subjectPublicKeyInfo'];
+        $key = ASN1::encodeDER($key, Maps\SubjectPublicKeyInfo::MAP);
+        $x509['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'] =
+            "-----BEGIN PUBLIC KEY-----\r\n" .
+            chunk_split(base64_encode($key), 64) .
+            "-----END PUBLIC KEY-----";
+
+        $this->currentCert = $x509;
+        $this->dn = $x509['tbsCertificate']['subject'];
+
+        $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
+        $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;
+
+        return $x509;
+    }
+
+    /**
+     * Save X.509 certificate
+     *
+     * @param array $cert
+     * @param int $format optional
+     * @return string
+     */
+    public function saveX509(array $cert, $format = self::FORMAT_PEM)
+    {
+        if (!is_array($cert) || !isset($cert['tbsCertificate'])) {
+            return false;
+        }
+
+        switch (true) {
+            // "case !$a: case !$b: break; default: whatever();" is the same thing as "if ($a && $b) whatever()"
+            case !($algorithm = $this->subArray($cert, 'tbsCertificate/subjectPublicKeyInfo/algorithm/algorithm')):
+            case is_object($cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
+                break;
+            default:
+                $cert['tbsCertificate']['subjectPublicKeyInfo'] = new Element(
+                    base64_decode(preg_replace('#-.+-|[\r\n]#', '', $cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']))
+                );
+        }
+
+        if ($algorithm == 'rsaEncryption') {
+            $cert['signatureAlgorithm']['parameters'] = null;
+            $cert['tbsCertificate']['signature']['parameters'] = null;
+        }
+
+        $filters = [];
+        $type_utf8_string = ['type' => ASN1::TYPE_UTF8_STRING];
+        $filters['tbsCertificate']['signature']['parameters'] = $type_utf8_string;
+        $filters['tbsCertificate']['signature']['issuer']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['issuer']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['subject']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['parameters'] = $type_utf8_string;
+        $filters['signatureAlgorithm']['parameters'] = $type_utf8_string;
+        $filters['authorityCertIssuer']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+        //$filters['policyQualifiers']['qualifier'] = $type_utf8_string;
+        $filters['distributionPoint']['fullName']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+
+        foreach (self::$extensions as $extension) {
+            $filters['tbsCertificate']['extensions'][] = $extension;
+        }
+
+        /* in the case of policyQualifiers/qualifier, the type has to be \phpseclib3\File\ASN1::TYPE_IA5_STRING.
+           \phpseclib3\File\ASN1::TYPE_PRINTABLE_STRING will cause OpenSSL's X.509 parser to spit out random
+           characters.
+         */
+        $filters['policyQualifiers']['qualifier']
+            = ['type' => ASN1::TYPE_IA5_STRING];
+
+        ASN1::setFilters($filters);
+
+        $this->mapOutExtensions($cert, 'tbsCertificate/extensions');
+        $this->mapOutDNs($cert, 'tbsCertificate/issuer/rdnSequence');
+        $this->mapOutDNs($cert, 'tbsCertificate/subject/rdnSequence');
+
+        $cert = ASN1::encodeDER($cert, Maps\Certificate::MAP);
+
+        switch ($format) {
+            case self::FORMAT_DER:
+                return $cert;
+            // case self::FORMAT_PEM:
+            default:
+                return "-----BEGIN CERTIFICATE-----\r\n" . chunk_split(Strings::base64_encode($cert), 64) . '-----END CERTIFICATE-----';
+        }
+    }
+
+    /**
+     * Map extension values from octet string to extension-specific internal
+     *   format.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapInExtensions(array &$root, $path)
+    {
+        $extensions = &$this->subArrayUnchecked($root, $path);
+
+        if ($extensions) {
+            for ($i = 0; $i < count($extensions); $i++) {
+                $id = $extensions[$i]['extnId'];
+                $value = &$extensions[$i]['extnValue'];
+                /* [extnValue] contains the DER encoding of an ASN.1 value
+                   corresponding to the extension type identified by extnID */
+                $map = $this->getMapping($id);
+                if (!is_bool($map)) {
+                    $decoder = $id == 'id-ce-nameConstraints' ?
+                        [static::class, 'decodeNameConstraintIP'] :
+                        [static::class, 'decodeIP'];
+                    $decoded = ASN1::decodeBER($value);
+                    if (!$decoded) {
+                        continue;
+                    }
+                    $mapped = ASN1::asn1map($decoded[0], $map, ['iPAddress' => $decoder]);
+                    $value = $mapped === false ? $decoded[0] : $mapped;
+
+                    if ($id == 'id-ce-certificatePolicies') {
+                        for ($j = 0; $j < count($value); $j++) {
+                            if (!isset($value[$j]['policyQualifiers'])) {
+                                continue;
+                            }
+                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
+                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
+                                $map = $this->getMapping($subid);
+                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
+                                if ($map !== false) {
+                                    $decoded = ASN1::decodeBER($subvalue);
+                                    if (!$decoded) {
+                                        continue;
+                                    }
+                                    $mapped = ASN1::asn1map($decoded[0], $map);
+                                    $subvalue = $mapped === false ? $decoded[0] : $mapped;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map extension values from extension-specific internal format to
+     *   octet string.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapOutExtensions(array &$root, $path)
+    {
+        $extensions = &$this->subArray($root, $path, !empty($this->extensionValues));
+
+        foreach ($this->extensionValues as $id => $data) {
+            extract($data);
+            $newext = [
+                'extnId' => $id,
+                'extnValue' => $value,
+                'critical' => $critical
+            ];
+            if ($replace) {
+                foreach ($extensions as $key => $value) {
+                    if ($value['extnId'] == $id) {
+                        $extensions[$key] = $newext;
+                        continue 2;
+                    }
+                }
+            }
+            $extensions[] = $newext;
+        }
+
+        if (is_array($extensions)) {
+            $size = count($extensions);
+            for ($i = 0; $i < $size; $i++) {
+                if ($extensions[$i] instanceof Element) {
+                    continue;
+                }
+
+                $id = $extensions[$i]['extnId'];
+                $value = &$extensions[$i]['extnValue'];
+
+                switch ($id) {
+                    case 'id-ce-certificatePolicies':
+                        for ($j = 0; $j < count($value); $j++) {
+                            if (!isset($value[$j]['policyQualifiers'])) {
+                                continue;
+                            }
+                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
+                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
+                                $map = $this->getMapping($subid);
+                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
+                                if ($map !== false) {
+                                    // by default \phpseclib3\File\ASN1 will try to render qualifier as a \phpseclib3\File\ASN1::TYPE_IA5_STRING since it's
+                                    // actual type is \phpseclib3\File\ASN1::TYPE_ANY
+                                    $subvalue = new Element(ASN1::encodeDER($subvalue, $map));
+                                }
+                            }
+                        }
+                        break;
+                    case 'id-ce-authorityKeyIdentifier': // use 00 as the serial number instead of an empty string
+                        if (isset($value['authorityCertSerialNumber'])) {
+                            if ($value['authorityCertSerialNumber']->toBytes() == '') {
+                                $temp = chr((ASN1::CLASS_CONTEXT_SPECIFIC << 6) | 2) . "\1\0";
+                                $value['authorityCertSerialNumber'] = new Element($temp);
+                            }
+                        }
+                }
+
+                /* [extnValue] contains the DER encoding of an ASN.1 value
+                   corresponding to the extension type identified by extnID */
+                $map = $this->getMapping($id);
+                if (is_bool($map)) {
+                    if (!$map) {
+                        //user_error($id . ' is not a currently supported extension');
+                        unset($extensions[$i]);
+                    }
+                } else {
+                    $value = ASN1::encodeDER($value, $map, ['iPAddress' => [static::class, 'encodeIP']]);
+                }
+            }
+        }
+    }
+
+    /**
+     * Map attribute values from ANY type to attribute-specific internal
+     *   format.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapInAttributes(&$root, $path)
+    {
+        $attributes = &$this->subArray($root, $path);
+
+        if (is_array($attributes)) {
+            for ($i = 0; $i < count($attributes); $i++) {
+                $id = $attributes[$i]['type'];
+                /* $value contains the DER encoding of an ASN.1 value
+                   corresponding to the attribute type identified by type */
+                $map = $this->getMapping($id);
+                if (is_array($attributes[$i]['value'])) {
+                    $values = &$attributes[$i]['value'];
+                    for ($j = 0; $j < count($values); $j++) {
+                        $value = ASN1::encodeDER($values[$j], Maps\AttributeValue::MAP);
+                        $decoded = ASN1::decodeBER($value);
+                        if (!is_bool($map)) {
+                            if (!$decoded) {
+                                continue;
+                            }
+                            $mapped = ASN1::asn1map($decoded[0], $map);
+                            if ($mapped !== false) {
+                                $values[$j] = $mapped;
+                            }
+                            if ($id == 'pkcs-9-at-extensionRequest' && $this->isSubArrayValid($values, $j)) {
+                                $this->mapInExtensions($values, $j);
+                            }
+                        } elseif ($map) {
+                            $values[$j] = $value;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map attribute values from attribute-specific internal format to
+     *   ANY type.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapOutAttributes(&$root, $path)
+    {
+        $attributes = &$this->subArray($root, $path);
+
+        if (is_array($attributes)) {
+            $size = count($attributes);
+            for ($i = 0; $i < $size; $i++) {
+                /* [value] contains the DER encoding of an ASN.1 value
+                   corresponding to the attribute type identified by type */
+                $id = $attributes[$i]['type'];
+                $map = $this->getMapping($id);
+                if ($map === false) {
+                    //user_error($id . ' is not a currently supported attribute', E_USER_NOTICE);
+                    unset($attributes[$i]);
+                } elseif (is_array($attributes[$i]['value'])) {
+                    $values = &$attributes[$i]['value'];
+                    for ($j = 0; $j < count($values); $j++) {
+                        switch ($id) {
+                            case 'pkcs-9-at-extensionRequest':
+                                $this->mapOutExtensions($values, $j);
+                                break;
+                        }
+
+                        if (!is_bool($map)) {
+                            $temp = ASN1::encodeDER($values[$j], $map);
+                            $decoded = ASN1::decodeBER($temp);
+                            if (!$decoded) {
+                                continue;
+                            }
+                            $values[$j] = ASN1::asn1map($decoded[0], Maps\AttributeValue::MAP);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map DN values from ANY type to DN-specific internal
+     *   format.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapInDNs(array &$root, $path)
+    {
+        $dns = &$this->subArray($root, $path);
+
+        if (is_array($dns)) {
+            for ($i = 0; $i < count($dns); $i++) {
+                for ($j = 0; $j < count($dns[$i]); $j++) {
+                    $type = $dns[$i][$j]['type'];
+                    $value = &$dns[$i][$j]['value'];
+                    if (is_object($value) && $value instanceof Element) {
+                        $map = $this->getMapping($type);
+                        if (!is_bool($map)) {
+                            $decoded = ASN1::decodeBER($value);
+                            if (!$decoded) {
+                                continue;
+                            }
+                            $value = ASN1::asn1map($decoded[0], $map);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map DN values from DN-specific internal format to
+     *   ANY type.
+     *
+     * @param array $root (by reference)
+     * @param string $path
+     */
+    private function mapOutDNs(array &$root, $path)
+    {
+        $dns = &$this->subArray($root, $path);
+
+        if (is_array($dns)) {
+            $size = count($dns);
+            for ($i = 0; $i < $size; $i++) {
+                for ($j = 0; $j < count($dns[$i]); $j++) {
+                    $type = $dns[$i][$j]['type'];
+                    $value = &$dns[$i][$j]['value'];
+                    if (is_object($value) && $value instanceof Element) {
+                        continue;
+                    }
+
+                    $map = $this->getMapping($type);
+                    if (!is_bool($map)) {
+                        $value = new Element(ASN1::encodeDER($value, $map));
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Associate an extension ID to an extension mapping
+     *
+     * @param string $extnId
+     * @return mixed
+     */
+    private function getMapping($extnId)
+    {
+        if (!is_string($extnId)) { // eg. if it's a \phpseclib3\File\ASN1\Element object
+            return true;
+        }
+
+        if (isset(self::$extensions[$extnId])) {
+            return self::$extensions[$extnId];
+        }
+
+        switch ($extnId) {
+            case 'id-ce-keyUsage':
+                return Maps\KeyUsage::MAP;
+            case 'id-ce-basicConstraints':
+                return Maps\BasicConstraints::MAP;
+            case 'id-ce-subjectKeyIdentifier':
+                return Maps\KeyIdentifier::MAP;
+            case 'id-ce-cRLDistributionPoints':
+                return Maps\CRLDistributionPoints::MAP;
+            case 'id-ce-authorityKeyIdentifier':
+                return Maps\AuthorityKeyIdentifier::MAP;
+            case 'id-ce-certificatePolicies':
+                return Maps\CertificatePolicies::MAP;
+            case 'id-ce-extKeyUsage':
+                return Maps\ExtKeyUsageSyntax::MAP;
+            case 'id-pe-authorityInfoAccess':
+                return Maps\AuthorityInfoAccessSyntax::MAP;
+            case 'id-ce-subjectAltName':
+                return Maps\SubjectAltName::MAP;
+            case 'id-ce-subjectDirectoryAttributes':
+                return Maps\SubjectDirectoryAttributes::MAP;
+            case 'id-ce-privateKeyUsagePeriod':
+                return Maps\PrivateKeyUsagePeriod::MAP;
+            case 'id-ce-issuerAltName':
+                return Maps\IssuerAltName::MAP;
+            case 'id-ce-policyMappings':
+                return Maps\PolicyMappings::MAP;
+            case 'id-ce-nameConstraints':
+                return Maps\NameConstraints::MAP;
+
+            case 'netscape-cert-type':
+                return Maps\netscape_cert_type::MAP;
+            case 'netscape-comment':
+                return Maps\netscape_comment::MAP;
+            case 'netscape-ca-policy-url':
+                return Maps\netscape_ca_policy_url::MAP;
+
+            // since id-qt-cps isn't a constructed type it will have already been decoded as a string by the time it gets
+            // back around to asn1map() and we don't want it decoded again.
+            //case 'id-qt-cps':
+            //    return Maps\CPSuri::MAP;
+            case 'id-qt-unotice':
+                return Maps\UserNotice::MAP;
+
+            // the following OIDs are unsupported but we don't want them to give notices when calling saveX509().
+            case 'id-pe-logotype': // http://www.ietf.org/rfc/rfc3709.txt
+            case 'entrustVersInfo':
+            // http://support.microsoft.com/kb/287547
+            case '1.3.6.1.4.1.311.20.2': // szOID_ENROLL_CERTTYPE_EXTENSION
+            case '1.3.6.1.4.1.311.21.1': // szOID_CERTSRV_CA_VERSION
+            // "SET Secure Electronic Transaction Specification"
+            // http://www.maithean.com/docs/set_bk3.pdf
+            case '2.23.42.7.0': // id-set-hashedRootKey
+            // "Certificate Transparency"
+            // https://tools.ietf.org/html/rfc6962
+            case '1.3.6.1.4.1.11129.2.4.2':
+            // "Qualified Certificate statements"
+            // https://tools.ietf.org/html/rfc3739#section-3.2.6
+            case '1.3.6.1.5.5.7.1.3':
+                return true;
+
+            // CSR attributes
+            case 'pkcs-9-at-unstructuredName':
+                return Maps\PKCS9String::MAP;
+            case 'pkcs-9-at-challengePassword':
+                return Maps\DirectoryString::MAP;
+            case 'pkcs-9-at-extensionRequest':
+                return Maps\Extensions::MAP;
+
+            // CRL extensions.
+            case 'id-ce-cRLNumber':
+                return Maps\CRLNumber::MAP;
+            case 'id-ce-deltaCRLIndicator':
+                return Maps\CRLNumber::MAP;
+            case 'id-ce-issuingDistributionPoint':
+                return Maps\IssuingDistributionPoint::MAP;
+            case 'id-ce-freshestCRL':
+                return Maps\CRLDistributionPoints::MAP;
+            case 'id-ce-cRLReasons':
+                return Maps\CRLReason::MAP;
+            case 'id-ce-invalidityDate':
+                return Maps\InvalidityDate::MAP;
+            case 'id-ce-certificateIssuer':
+                return Maps\CertificateIssuer::MAP;
+            case 'id-ce-holdInstructionCode':
+                return Maps\HoldInstructionCode::MAP;
+            case 'id-at-postalAddress':
+                return Maps\PostalAddress::MAP;
+        }
+
+        return false;
+    }
+
+    /**
+     * Load an X.509 certificate as a certificate authority
+     *
+     * @param string $cert
+     * @return bool
+     */
+    public function loadCA($cert)
+    {
+        $olddn = $this->dn;
+        $oldcert = $this->currentCert;
+        $oldsigsubj = $this->signatureSubject;
+        $oldkeyid = $this->currentKeyIdentifier;
+
+        $cert = $this->loadX509($cert);
+        if (!$cert) {
+            $this->dn = $olddn;
+            $this->currentCert = $oldcert;
+            $this->signatureSubject = $oldsigsubj;
+            $this->currentKeyIdentifier = $oldkeyid;
+
+            return false;
+        }
+
+        /* From RFC5280 "PKIX Certificate and CRL Profile":
+
+           If the keyUsage extension is present, then the subject public key
+           MUST NOT be used to verify signatures on certificates or CRLs unless
+           the corresponding keyCertSign or cRLSign bit is set. */
+        //$keyUsage = $this->getExtension('id-ce-keyUsage');
+        //if ($keyUsage && !in_array('keyCertSign', $keyUsage)) {
+        //    return false;
+        //}
+
+        /* From RFC5280 "PKIX Certificate and CRL Profile":
+
+           The cA boolean indicates whether the certified public key may be used
+           to verify certificate signatures.  If the cA boolean is not asserted,
+           then the keyCertSign bit in the key usage extension MUST NOT be
+           asserted.  If the basic constraints extension is not present in a
+           version 3 certificate, or the extension is present but the cA boolean
+           is not asserted, then the certified public key MUST NOT be used to
+           verify certificate signatures. */
+        //$basicConstraints = $this->getExtension('id-ce-basicConstraints');
+        //if (!$basicConstraints || !$basicConstraints['cA']) {
+        //    return false;
+        //}
+
+        $this->CAs[] = $cert;
+
+        $this->dn = $olddn;
+        $this->currentCert = $oldcert;
+        $this->signatureSubject = $oldsigsubj;
+
+        return true;
+    }
+
+    /**
+     * Validate an X.509 certificate against a URL
+     *
+     * From RFC2818 "HTTP over TLS":
+     *
+     * Matching is performed using the matching rules specified by
+     * [RFC2459].  If more than one identity of a given type is present in
+     * the certificate (e.g., more than one dNSName name, a match in any one
+     * of the set is considered acceptable.) Names may contain the wildcard
+     * character * which is considered to match any single domain name
+     * component or component fragment. E.g., *.a.com matches foo.a.com but
+     * not bar.foo.a.com. f*.com matches foo.com but not bar.com.
+     *
+     * @param string $url
+     * @return bool
+     */
+    public function validateURL($url)
+    {
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+
+        $components = parse_url($url);
+        if (!isset($components['host'])) {
+            return false;
+        }
+
+        if ($names = $this->getExtension('id-ce-subjectAltName')) {
+            foreach ($names as $name) {
+                foreach ($name as $key => $value) {
+                    $value = preg_quote($value);
+                    $value = str_replace('\*', '[^.]*', $value);
+                    switch ($key) {
+                        case 'dNSName':
+                            /* From RFC2818 "HTTP over TLS":
+
+                               If a subjectAltName extension of type dNSName is present, that MUST
+                               be used as the identity. Otherwise, the (most specific) Common Name
+                               field in the Subject field of the certificate MUST be used. Although
+                               the use of the Common Name is existing practice, it is deprecated and
+                               Certification Authorities are encouraged to use the dNSName instead. */
+                            if (preg_match('#^' . $value . '$#', $components['host'])) {
+                                return true;
+                            }
+                            break;
+                        case 'iPAddress':
+                            /* From RFC2818 "HTTP over TLS":
+
+                               In some cases, the URI is specified as an IP address rather than a
+                               hostname. In this case, the iPAddress subjectAltName must be present
+                               in the certificate and must exactly match the IP in the URI. */
+                            if (preg_match('#(?:\d{1-3}\.){4}#', $components['host'] . '.') && preg_match('#^' . $value . '$#', $components['host'])) {
+                                return true;
+                            }
+                    }
+                }
+            }
+            return false;
+        }
+
+        if ($value = $this->getDNProp('id-at-commonName')) {
+            $value = str_replace(['.', '*'], ['\.', '[^.]*'], $value[0]);
+            return preg_match('#^' . $value . '$#', $components['host']) === 1;
+        }
+
+        return false;
+    }
+
+    /**
+     * Validate a date
+     *
+     * If $date isn't defined it is assumed to be the current date.
+     *
+     * @param \DateTimeInterface|string $date optional
+     * @return bool
+     */
+    public function validateDate($date = null)
+    {
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+
+        if (!isset($date)) {
+            $date = new \DateTimeImmutable('now', new \DateTimeZone(@date_default_timezone_get()));
+        }
+
+        $notBefore = $this->currentCert['tbsCertificate']['validity']['notBefore'];
+        $notBefore = isset($notBefore['generalTime']) ? $notBefore['generalTime'] : $notBefore['utcTime'];
+
+        $notAfter = $this->currentCert['tbsCertificate']['validity']['notAfter'];
+        $notAfter = isset($notAfter['generalTime']) ? $notAfter['generalTime'] : $notAfter['utcTime'];
+
+        if (is_string($date)) {
+            $date = new \DateTimeImmutable($date, new \DateTimeZone(@date_default_timezone_get()));
+        }
+
+        $notBefore = new \DateTimeImmutable($notBefore, new \DateTimeZone(@date_default_timezone_get()));
+        $notAfter = new \DateTimeImmutable($notAfter, new \DateTimeZone(@date_default_timezone_get()));
+
+        return $date >= $notBefore && $date <= $notAfter;
+    }
+
+    /**
+     * Fetches a URL
+     *
+     * @param string $url
+     * @return bool|string
+     */
+    private static function fetchURL($url)
+    {
+        if (self::$disable_url_fetch) {
+            return false;
+        }
+
+        $parts = parse_url($url);
+        $data = '';
+        switch ($parts['scheme']) {
+            case 'http':
+                $fsock = @fsockopen($parts['host'], isset($parts['port']) ? $parts['port'] : 80);
+                if (!$fsock) {
+                    return false;
+                }
+                $path = $parts['path'];
+                if (isset($parts['query'])) {
+                    $path .= '?' . $parts['query'];
+                }
+                fputs($fsock, "GET $path HTTP/1.0\r\n");
+                fputs($fsock, "Host: $parts[host]\r\n\r\n");
+                $line = fgets($fsock, 1024);
+                if (strlen($line) < 3) {
+                    return false;
+                }
+                preg_match('#HTTP/1.\d (\d{3})#', $line, $temp);
+                if ($temp[1] != '200') {
+                    return false;
+                }
+
+                // skip the rest of the headers in the http response
+                while (!feof($fsock) && fgets($fsock, 1024) != "\r\n") {
+                }
+
+                while (!feof($fsock)) {
+                    $temp = fread($fsock, 1024);
+                    if ($temp === false) {
+                        return false;
+                    }
+                    $data .= $temp;
+                }
+
+                break;
+            //case 'ftp':
+            //case 'ldap':
+            //default:
+        }
+
+        return $data;
+    }
+
+    /**
+     * Validates an intermediate cert as identified via authority info access extension
+     *
+     * See https://tools.ietf.org/html/rfc4325 for more info
+     *
+     * @param bool $caonly
+     * @param int $count
+     * @return bool
+     */
+    private function testForIntermediate($caonly, $count)
+    {
+        $opts = $this->getExtension('id-pe-authorityInfoAccess');
+        if (!is_array($opts)) {
+            return false;
+        }
+        foreach ($opts as $opt) {
+            if ($opt['accessMethod'] == 'id-ad-caIssuers') {
+                // accessLocation is a GeneralName. GeneralName fields support stuff like email addresses, IP addresses, LDAP,
+                // etc, but we're only supporting URI's. URI's and LDAP are the only thing https://tools.ietf.org/html/rfc4325
+                // discusses
+                if (isset($opt['accessLocation']['uniformResourceIdentifier'])) {
+                    $url = $opt['accessLocation']['uniformResourceIdentifier'];
+                    break;
+                }
+            }
+        }
+
+        if (!isset($url)) {
+            return false;
+        }
+
+        $cert = static::fetchURL($url);
+        if (!is_string($cert)) {
+            return false;
+        }
+
+        $parent = new static();
+        $parent->CAs = $this->CAs;
+        /*
+         "Conforming applications that support HTTP or FTP for accessing
+          certificates MUST be able to accept .cer files and SHOULD be able
+          to accept .p7c files." -- https://tools.ietf.org/html/rfc4325
+
+         A .p7c file is 'a "certs-only" CMS message as specified in RFC 2797"
+
+         These are currently unsupported
+        */
+        if (!is_array($parent->loadX509($cert))) {
+            return false;
+        }
+
+        if (!$parent->validateSignatureCountable($caonly, ++$count)) {
+            return false;
+        }
+
+        $this->CAs[] = $parent->currentCert;
+        //$this->loadCA($cert);
+
+        return true;
+    }
+
+    /**
+     * Validate a signature
+     *
+     * Works on X.509 certs, CSR's and CRL's.
+     * Returns true if the signature is verified, false if it is not correct or null on error
+     *
+     * By default returns false for self-signed certs. Call validateSignature(false) to make this support
+     * self-signed.
+     *
+     * The behavior of this function is inspired by {@link http://php.net/openssl-verify openssl_verify}.
+     *
+     * @param bool $caonly optional
+     * @return mixed
+     */
+    public function validateSignature($caonly = true)
+    {
+        return $this->validateSignatureCountable($caonly, 0);
+    }
+
+    /**
+     * Validate a signature
+     *
+     * Performs said validation whilst keeping track of how many times validation method is called
+     *
+     * @param bool $caonly
+     * @param int $count
+     * @return mixed
+     */
+    private function validateSignatureCountable($caonly, $count)
+    {
+        if (!is_array($this->currentCert) || !isset($this->signatureSubject)) {
+            return null;
+        }
+
+        if ($count == self::$recur_limit) {
+            return false;
+        }
+
+        /* TODO:
+           "emailAddress attribute values are not case-sensitive (e.g., "subscriber@example.com" is the same as "SUBSCRIBER@EXAMPLE.COM")."
+            -- http://tools.ietf.org/html/rfc5280#section-4.1.2.6
+
+           implement pathLenConstraint in the id-ce-basicConstraints extension */
+
+        switch (true) {
+            case isset($this->currentCert['tbsCertificate']):
+                // self-signed cert
+                switch (true) {
+                    case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $this->currentCert['tbsCertificate']['subject']:
+                    case defined('FILE_X509_IGNORE_TYPE') && $this->getIssuerDN(self::DN_STRING) === $this->getDN(self::DN_STRING):
+                        $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                        $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier');
+                        switch (true) {
+                            case !is_array($authorityKey):
+                            case !$subjectKeyID:
+                            case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                $signingCert = $this->currentCert; // working cert
+                        }
+                }
+
+                if (!empty($this->CAs)) {
+                    for ($i = 0; $i < count($this->CAs); $i++) {
+                        // even if the cert is a self-signed one we still want to see if it's a CA;
+                        // if not, we'll conditionally return an error
+                        $ca = $this->CAs[$i];
+                        switch (true) {
+                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']:
+                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(self::DN_STRING, $this->currentCert['tbsCertificate']['issuer']) === $this->getDN(self::DN_STRING, $ca['tbsCertificate']['subject']):
+                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                                switch (true) {
+                                    case !is_array($authorityKey):
+                                    case !$subjectKeyID:
+                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
+                                            break 2; // serial mismatch - check other ca
+                                        }
+                                        $signingCert = $ca; // working cert
+                                        break 3;
+                                }
+                        }
+                    }
+                    if (count($this->CAs) == $i && $caonly) {
+                        return $this->testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
+                    }
+                } elseif (!isset($signingCert) || $caonly) {
+                    return $this->testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
+                }
+                return $this->validateSignatureHelper(
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr($this->currentCert['signature'], 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->validateSignatureHelper(
+                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['algorithm']['algorithm'],
+                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr($this->currentCert['signature'], 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['publicKeyAndChallenge']):
+                return $this->validateSignatureHelper(
+                    $this->currentCert['publicKeyAndChallenge']['spki']['algorithm']['algorithm'],
+                    $this->currentCert['publicKeyAndChallenge']['spki']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr($this->currentCert['signature'], 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['tbsCertList']):
+                if (!empty($this->CAs)) {
+                    for ($i = 0; $i < count($this->CAs); $i++) {
+                        $ca = $this->CAs[$i];
+                        switch (true) {
+                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertList']['issuer'] === $ca['tbsCertificate']['subject']:
+                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(self::DN_STRING, $this->currentCert['tbsCertList']['issuer']) === $this->getDN(self::DN_STRING, $ca['tbsCertificate']['subject']):
+                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                                switch (true) {
+                                    case !is_array($authorityKey):
+                                    case !$subjectKeyID:
+                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
+                                            break 2; // serial mismatch - check other ca
+                                        }
+                                        $signingCert = $ca; // working cert
+                                        break 3;
+                                }
+                        }
+                    }
+                }
+                if (!isset($signingCert)) {
+                    return false;
+                }
+                return $this->validateSignatureHelper(
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr($this->currentCert['signature'], 1),
+                    $this->signatureSubject
+                );
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Validates a signature
+     *
+     * Returns true if the signature is verified and false if it is not correct.
+     * If the algorithms are unsupposed an exception is thrown.
+     *
+     * @param string $publicKeyAlgorithm
+     * @param string $publicKey
+     * @param string $signatureAlgorithm
+     * @param string $signature
+     * @param string $signatureSubject
+     * @throws UnsupportedAlgorithmException if the algorithm is unsupported
+     * @return bool
+     */
+    private function validateSignatureHelper($publicKeyAlgorithm, $publicKey, $signatureAlgorithm, $signature, $signatureSubject)
+    {
+        switch ($publicKeyAlgorithm) {
+            case 'id-RSASSA-PSS':
+                $key = RSA::loadFormat('PSS', $publicKey);
+                break;
+            case 'rsaEncryption':
+                $key = RSA::loadFormat('PKCS8', $publicKey);
+                switch ($signatureAlgorithm) {
+                    case 'id-RSASSA-PSS':
+                        break;
+                    case 'md2WithRSAEncryption':
+                    case 'md5WithRSAEncryption':
+                    case 'sha1WithRSAEncryption':
+                    case 'sha224WithRSAEncryption':
+                    case 'sha256WithRSAEncryption':
+                    case 'sha384WithRSAEncryption':
+                    case 'sha512WithRSAEncryption':
+                        $key = $key
+                            ->withHash(preg_replace('#WithRSAEncryption$#', '', $signatureAlgorithm))
+                            ->withPadding(RSA::SIGNATURE_PKCS1);
+                        break;
+                    default:
+                        throw new UnsupportedAlgorithmException('Signature algorithm unsupported');
+                }
+                break;
+            case 'id-Ed25519':
+            case 'id-Ed448':
+                $key = EC::loadFormat('PKCS8', $publicKey);
+                break;
+            case 'id-ecPublicKey':
+                $key = EC::loadFormat('PKCS8', $publicKey);
+                switch ($signatureAlgorithm) {
+                    case 'ecdsa-with-SHA1':
+                    case 'ecdsa-with-SHA224':
+                    case 'ecdsa-with-SHA256':
+                    case 'ecdsa-with-SHA384':
+                    case 'ecdsa-with-SHA512':
+                        $key = $key
+                            ->withHash(preg_replace('#^ecdsa-with-#', '', strtolower($signatureAlgorithm)));
+                        break;
+                    default:
+                        throw new UnsupportedAlgorithmException('Signature algorithm unsupported');
+                }
+                break;
+            case 'id-dsa':
+                $key = DSA::loadFormat('PKCS8', $publicKey);
+                switch ($signatureAlgorithm) {
+                    case 'id-dsa-with-sha1':
+                    case 'id-dsa-with-sha224':
+                    case 'id-dsa-with-sha256':
+                        $key = $key
+                            ->withHash(preg_replace('#^id-dsa-with-#', '', strtolower($signatureAlgorithm)));
+                        break;
+                    default:
+                        throw new UnsupportedAlgorithmException('Signature algorithm unsupported');
+                }
+                break;
+            default:
+                throw new UnsupportedAlgorithmException('Public key algorithm unsupported');
+        }
+
+        return $key->verify($signatureSubject, $signature);
+    }
+
+    /**
+     * Sets the recursion limit
+     *
+     * When validating a signature it may be necessary to download intermediate certs from URI's.
+     * An intermediate cert that linked to itself would result in an infinite loop so to prevent
+     * that we set a recursion limit. A negative number means that there is no recursion limit.
+     *
+     * @param int $count
+     */
+    public static function setRecurLimit($count)
+    {
+        self::$recur_limit = $count;
+    }
+
+    /**
+     * Prevents URIs from being automatically retrieved
+     *
+     */
+    public static function disableURLFetch()
+    {
+        self::$disable_url_fetch = true;
+    }
+
+    /**
+     * Allows URIs to be automatically retrieved
+     *
+     */
+    public static function enableURLFetch()
+    {
+        self::$disable_url_fetch = false;
+    }
+
+    /**
+     * Decodes an IP address
+     *
+     * Takes in a base64 encoded "blob" and returns a human readable IP address
+     *
+     * @param string $ip
+     * @return string
+     */
+    public static function decodeIP($ip)
+    {
+        return inet_ntop($ip);
+    }
+
+    /**
+     * Decodes an IP address in a name constraints extension
+     *
+     * Takes in a base64 encoded "blob" and returns a human readable IP address / mask
+     *
+     * @param string $ip
+     * @return array
+     */
+    public static function decodeNameConstraintIP($ip)
+    {
+        $size = strlen($ip) >> 1;
+        $mask = substr($ip, $size);
+        $ip = substr($ip, 0, $size);
+        return [inet_ntop($ip), inet_ntop($mask)];
+    }
+
+    /**
+     * Encodes an IP address
+     *
+     * Takes a human readable IP address into a base64-encoded "blob"
+     *
+     * @param string|array $ip
+     * @return string
+     */
+    public static function encodeIP($ip)
+    {
+        return is_string($ip) ?
+            inet_pton($ip) :
+            inet_pton($ip[0]) . inet_pton($ip[1]);
+    }
+
+    /**
+     * "Normalizes" a Distinguished Name property
+     *
+     * @param string $propName
+     * @return mixed
+     */
+    private function translateDNProp($propName)
+    {
+        switch (strtolower($propName)) {
+            case 'jurisdictionofincorporationcountryname':
+            case 'jurisdictioncountryname':
+            case 'jurisdictionc':
+                return 'jurisdictionOfIncorporationCountryName';
+            case 'jurisdictionofincorporationstateorprovincename':
+            case 'jurisdictionstateorprovincename':
+            case 'jurisdictionst':
+                return 'jurisdictionOfIncorporationStateOrProvinceName';
+            case 'jurisdictionlocalityname':
+            case 'jurisdictionl':
+                return 'jurisdictionLocalityName';
+            case 'id-at-businesscategory':
+            case 'businesscategory':
+                return 'id-at-businessCategory';
+            case 'id-at-countryname':
+            case 'countryname':
+            case 'c':
+                return 'id-at-countryName';
+            case 'id-at-organizationname':
+            case 'organizationname':
+            case 'o':
+                return 'id-at-organizationName';
+            case 'id-at-dnqualifier':
+            case 'dnqualifier':
+                return 'id-at-dnQualifier';
+            case 'id-at-commonname':
+            case 'commonname':
+            case 'cn':
+                return 'id-at-commonName';
+            case 'id-at-stateorprovincename':
+            case 'stateorprovincename':
+            case 'state':
+            case 'province':
+            case 'provincename':
+            case 'st':
+                return 'id-at-stateOrProvinceName';
+            case 'id-at-localityname':
+            case 'localityname':
+            case 'l':
+                return 'id-at-localityName';
+            case 'id-emailaddress':
+            case 'emailaddress':
+                return 'pkcs-9-at-emailAddress';
+            case 'id-at-serialnumber':
+            case 'serialnumber':
+                return 'id-at-serialNumber';
+            case 'id-at-postalcode':
+            case 'postalcode':
+                return 'id-at-postalCode';
+            case 'id-at-streetaddress':
+            case 'streetaddress':
+                return 'id-at-streetAddress';
+            case 'id-at-name':
+            case 'name':
+                return 'id-at-name';
+            case 'id-at-givenname':
+            case 'givenname':
+                return 'id-at-givenName';
+            case 'id-at-surname':
+            case 'surname':
+            case 'sn':
+                return 'id-at-surname';
+            case 'id-at-initials':
+            case 'initials':
+                return 'id-at-initials';
+            case 'id-at-generationqualifier':
+            case 'generationqualifier':
+                return 'id-at-generationQualifier';
+            case 'id-at-organizationalunitname':
+            case 'organizationalunitname':
+            case 'ou':
+                return 'id-at-organizationalUnitName';
+            case 'id-at-pseudonym':
+            case 'pseudonym':
+                return 'id-at-pseudonym';
+            case 'id-at-title':
+            case 'title':
+                return 'id-at-title';
+            case 'id-at-description':
+            case 'description':
+                return 'id-at-description';
+            case 'id-at-role':
+            case 'role':
+                return 'id-at-role';
+            case 'id-at-uniqueidentifier':
+            case 'uniqueidentifier':
+            case 'x500uniqueidentifier':
+                return 'id-at-uniqueIdentifier';
+            case 'postaladdress':
+            case 'id-at-postaladdress':
+                return 'id-at-postalAddress';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Set a Distinguished Name property
+     *
+     * @param string $propName
+     * @param mixed $propValue
+     * @param string $type optional
+     * @return bool
+     */
+    public function setDNProp($propName, $propValue, $type = 'utf8String')
+    {
+        if (empty($this->dn)) {
+            $this->dn = ['rdnSequence' => []];
+        }
+
+        if (($propName = $this->translateDNProp($propName)) === false) {
+            return false;
+        }
+
+        foreach ((array) $propValue as $v) {
+            if (!is_array($v) && isset($type)) {
+                $v = [$type => $v];
+            }
+            $this->dn['rdnSequence'][] = [
+                [
+                    'type' => $propName,
+                    'value' => $v
+                ]
+            ];
+        }
+
+        return true;
+    }
+
+    /**
+     * Remove Distinguished Name properties
+     *
+     * @param string $propName
+     */
+    public function removeDNProp($propName)
+    {
+        if (empty($this->dn)) {
+            return;
+        }
+
+        if (($propName = $this->translateDNProp($propName)) === false) {
+            return;
+        }
+
+        $dn = &$this->dn['rdnSequence'];
+        $size = count($dn);
+        for ($i = 0; $i < $size; $i++) {
+            if ($dn[$i][0]['type'] == $propName) {
+                unset($dn[$i]);
+            }
+        }
+
+        $dn = array_values($dn);
+        // fix for https://bugs.php.net/75433 affecting PHP 7.2
+        if (!isset($dn[0])) {
+            $dn = array_splice($dn, 0, 0);
+        }
+    }
+
+    /**
+     * Get Distinguished Name properties
+     *
+     * @param string $propName
+     * @param array $dn optional
+     * @param bool $withType optional
+     * @return mixed
+     */
+    public function getDNProp($propName, array $dn = null, $withType = false)
+    {
+        if (!isset($dn)) {
+            $dn = $this->dn;
+        }
+
+        if (empty($dn)) {
+            return false;
+        }
+
+        if (($propName = $this->translateDNProp($propName)) === false) {
+            return false;
+        }
+
+        $filters = [];
+        $filters['value'] = ['type' => ASN1::TYPE_UTF8_STRING];
+        ASN1::setFilters($filters);
+        $this->mapOutDNs($dn, 'rdnSequence');
+        $dn = $dn['rdnSequence'];
+        $result = [];
+        for ($i = 0; $i < count($dn); $i++) {
+            if ($dn[$i][0]['type'] == $propName) {
+                $v = $dn[$i][0]['value'];
+                if (!$withType) {
+                    if (is_array($v)) {
+                        foreach ($v as $type => $s) {
+                            $type = array_search($type, ASN1::ANY_MAP);
+                            if ($type !== false && array_key_exists($type, ASN1::STRING_TYPE_SIZE)) {
+                                $s = ASN1::convert($s, $type);
+                                if ($s !== false) {
+                                    $v = $s;
+                                    break;
+                                }
+                            }
+                        }
+                        if (is_array($v)) {
+                            $v = array_pop($v); // Always strip data type.
+                        }
+                    } elseif (is_object($v) && $v instanceof Element) {
+                        $map = $this->getMapping($propName);
+                        if (!is_bool($map)) {
+                            $decoded = ASN1::decodeBER($v);
+                            if (!$decoded) {
+                                return false;
+                            }
+                            $v = ASN1::asn1map($decoded[0], $map);
+                        }
+                    }
+                }
+                $result[] = $v;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Set a Distinguished Name
+     *
+     * @param mixed $dn
+     * @param bool $merge optional
+     * @param string $type optional
+     * @return bool
+     */
+    public function setDN($dn, $merge = false, $type = 'utf8String')
+    {
+        if (!$merge) {
+            $this->dn = null;
+        }
+
+        if (is_array($dn)) {
+            if (isset($dn['rdnSequence'])) {
+                $this->dn = $dn; // No merge here.
+                return true;
+            }
+
+            // handles stuff generated by openssl_x509_parse()
+            foreach ($dn as $prop => $value) {
+                if (!$this->setDNProp($prop, $value, $type)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        // handles everything else
+        $results = preg_split('#((?:^|, *|/)(?:C=|O=|OU=|CN=|L=|ST=|SN=|postalCode=|streetAddress=|emailAddress=|serialNumber=|organizationalUnitName=|title=|description=|role=|x500UniqueIdentifier=|postalAddress=))#', $dn, -1, PREG_SPLIT_DELIM_CAPTURE);
+        for ($i = 1; $i < count($results); $i += 2) {
+            $prop = trim($results[$i], ', =/');
+            $value = $results[$i + 1];
+            if (!$this->setDNProp($prop, $value, $type)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificates subject
+     *
+     * @param mixed $format optional
+     * @param array $dn optional
+     * @return array|bool|string
+     */
+    public function getDN($format = self::DN_ARRAY, array $dn = null)
+    {
+        if (!isset($dn)) {
+            $dn = isset($this->currentCert['tbsCertList']) ? $this->currentCert['tbsCertList']['issuer'] : $this->dn;
+        }
+
+        switch ((int) $format) {
+            case self::DN_ARRAY:
+                return $dn;
+            case self::DN_ASN1:
+                $filters = [];
+                $filters['rdnSequence']['value'] = ['type' => ASN1::TYPE_UTF8_STRING];
+                ASN1::setFilters($filters);
+                $this->mapOutDNs($dn, 'rdnSequence');
+                return ASN1::encodeDER($dn, Maps\Name::MAP);
+            case self::DN_CANON:
+                //  No SEQUENCE around RDNs and all string values normalized as
+                // trimmed lowercase UTF-8 with all spacing as one blank.
+                // constructed RDNs will not be canonicalized
+                $filters = [];
+                $filters['value'] = ['type' => ASN1::TYPE_UTF8_STRING];
+                ASN1::setFilters($filters);
+                $result = '';
+                $this->mapOutDNs($dn, 'rdnSequence');
+                foreach ($dn['rdnSequence'] as $rdn) {
+                    foreach ($rdn as $i => $attr) {
+                        $attr = &$rdn[$i];
+                        if (is_array($attr['value'])) {
+                            foreach ($attr['value'] as $type => $v) {
+                                $type = array_search($type, ASN1::ANY_MAP, true);
+                                if ($type !== false && array_key_exists($type, ASN1::STRING_TYPE_SIZE)) {
+                                    $v = ASN1::convert($v, $type);
+                                    if ($v !== false) {
+                                        $v = preg_replace('/\s+/', ' ', $v);
+                                        $attr['value'] = strtolower(trim($v));
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    $result .= ASN1::encodeDER($rdn, Maps\RelativeDistinguishedName::MAP);
+                }
+                return $result;
+            case self::DN_HASH:
+                $dn = $this->getDN(self::DN_CANON, $dn);
+                $hash = new Hash('sha1');
+                $hash = $hash->hash($dn);
+                extract(unpack('Vhash', $hash));
+                return strtolower(Strings::bin2hex(pack('N', $hash)));
+        }
+
+        // Default is to return a string.
+        $start = true;
+        $output = '';
+
+        $result = [];
+        $filters = [];
+        $filters['rdnSequence']['value'] = ['type' => ASN1::TYPE_UTF8_STRING];
+        ASN1::setFilters($filters);
+        $this->mapOutDNs($dn, 'rdnSequence');
+
+        foreach ($dn['rdnSequence'] as $field) {
+            $prop = $field[0]['type'];
+            $value = $field[0]['value'];
+
+            $delim = ', ';
+            switch ($prop) {
+                case 'id-at-countryName':
+                    $desc = 'C';
+                    break;
+                case 'id-at-stateOrProvinceName':
+                    $desc = 'ST';
+                    break;
+                case 'id-at-organizationName':
+                    $desc = 'O';
+                    break;
+                case 'id-at-organizationalUnitName':
+                    $desc = 'OU';
+                    break;
+                case 'id-at-commonName':
+                    $desc = 'CN';
+                    break;
+                case 'id-at-localityName':
+                    $desc = 'L';
+                    break;
+                case 'id-at-surname':
+                    $desc = 'SN';
+                    break;
+                case 'id-at-uniqueIdentifier':
+                    $delim = '/';
+                    $desc = 'x500UniqueIdentifier';
+                    break;
+                case 'id-at-postalAddress':
+                    $delim = '/';
+                    $desc = 'postalAddress';
+                    break;
+                default:
+                    $delim = '/';
+                    $desc = preg_replace('#.+-([^-]+)$#', '$1', $prop);
+            }
+
+            if (!$start) {
+                $output .= $delim;
+            }
+            if (is_array($value)) {
+                foreach ($value as $type => $v) {
+                    $type = array_search($type, ASN1::ANY_MAP, true);
+                    if ($type !== false && array_key_exists($type, ASN1::STRING_TYPE_SIZE)) {
+                        $v = ASN1::convert($v, $type);
+                        if ($v !== false) {
+                            $value = $v;
+                            break;
+                        }
+                    }
+                }
+                if (is_array($value)) {
+                    $value = array_pop($value); // Always strip data type.
+                }
+            } elseif (is_object($value) && $value instanceof Element) {
+                $callback = function ($x) {
+                    return '\x' . bin2hex($x[0]);
+                };
+                $value = strtoupper(preg_replace_callback('#[^\x20-\x7E]#', $callback, $value->element));
+            }
+            $output .= $desc . '=' . $value;
+            $result[$desc] = isset($result[$desc]) ?
+                array_merge((array) $result[$desc], [$value]) :
+                $value;
+            $start = false;
+        }
+
+        return $format == self::DN_OPENSSL ? $result : $output;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificate/crl issuer
+     *
+     * @param int $format optional
+     * @return mixed
+     */
+    public function getIssuerDN($format = self::DN_ARRAY)
+    {
+        switch (true) {
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDN($format, $this->currentCert['tbsCertificate']['issuer']);
+            case isset($this->currentCert['tbsCertList']):
+                return $this->getDN($format, $this->currentCert['tbsCertList']['issuer']);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificate/csr subject
+     * Alias of getDN()
+     *
+     * @param int $format optional
+     * @return mixed
+     */
+    public function getSubjectDN($format = self::DN_ARRAY)
+    {
+        switch (true) {
+            case !empty($this->dn):
+                return $this->getDN($format);
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDN($format, $this->currentCert['tbsCertificate']['subject']);
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->getDN($format, $this->currentCert['certificationRequestInfo']['subject']);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get an individual Distinguished Name property for a certificate/crl issuer
+     *
+     * @param string $propName
+     * @param bool $withType optional
+     * @return mixed
+     */
+    public function getIssuerDNProp($propName, $withType = false)
+    {
+        switch (true) {
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['issuer'], $withType);
+            case isset($this->currentCert['tbsCertList']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertList']['issuer'], $withType);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get an individual Distinguished Name property for a certificate/csr subject
+     *
+     * @param string $propName
+     * @param bool $withType optional
+     * @return mixed
+     */
+    public function getSubjectDNProp($propName, $withType = false)
+    {
+        switch (true) {
+            case !empty($this->dn):
+                return $this->getDNProp($propName, null, $withType);
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['subject'], $withType);
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->getDNProp($propName, $this->currentCert['certificationRequestInfo']['subject'], $withType);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the certificate chain for the current cert
+     *
+     * @return mixed
+     */
+    public function getChain()
+    {
+        $chain = [$this->currentCert];
+
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+        while (true) {
+            $currentCert = $chain[count($chain) - 1];
+            for ($i = 0; $i < count($this->CAs); $i++) {
+                $ca = $this->CAs[$i];
+                if ($currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']) {
+                    $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier', $currentCert);
+                    $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                    switch (true) {
+                        case !is_array($authorityKey):
+                        case is_array($authorityKey) && isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                            if ($currentCert === $ca) {
+                                break 3;
+                            }
+                            $chain[] = $ca;
+                            break 2;
+                    }
+                }
+            }
+            if ($i == count($this->CAs)) {
+                break;
+            }
+        }
+        foreach ($chain as $key => $value) {
+            $chain[$key] = new X509();
+            $chain[$key]->loadX509($value);
+        }
+        return $chain;
+    }
+
+    /**
+     * Returns the current cert
+     *
+     * @return array|bool
+     */
+    public function &getCurrentCert()
+    {
+        return $this->currentCert;
+    }
+
+    /**
+     * Set public key
+     *
+     * Key needs to be a \phpseclib3\Crypt\RSA object
+     *
+     * @param PublicKey $key
+     * @return void
+     */
+    public function setPublicKey(PublicKey $key)
+    {
+        $this->publicKey = $key;
+    }
+
+    /**
+     * Set private key
+     *
+     * Key needs to be a \phpseclib3\Crypt\RSA object
+     *
+     * @param PrivateKey $key
+     */
+    public function setPrivateKey(PrivateKey $key)
+    {
+        $this->privateKey = $key;
+    }
+
+    /**
+     * Set challenge
+     *
+     * Used for SPKAC CSR's
+     *
+     * @param string $challenge
+     */
+    public function setChallenge($challenge)
+    {
+        $this->challenge = $challenge;
+    }
+
+    /**
+     * Gets the public key
+     *
+     * Returns a \phpseclib3\Crypt\RSA object or a false.
+     *
+     * @return mixed
+     */
+    public function getPublicKey()
+    {
+        if (isset($this->publicKey)) {
+            return $this->publicKey;
+        }
+
+        if (isset($this->currentCert) && is_array($this->currentCert)) {
+            $paths = [
+                'tbsCertificate/subjectPublicKeyInfo',
+                'certificationRequestInfo/subjectPKInfo',
+                'publicKeyAndChallenge/spki'
+            ];
+            foreach ($paths as $path) {
+                $keyinfo = $this->subArray($this->currentCert, $path);
+                if (!empty($keyinfo)) {
+                    break;
+                }
+            }
+        }
+        if (empty($keyinfo)) {
+            return false;
+        }
+
+        $key = $keyinfo['subjectPublicKey'];
+
+        switch ($keyinfo['algorithm']['algorithm']) {
+            case 'id-RSASSA-PSS':
+                return RSA::loadFormat('PSS', $key);
+            case 'rsaEncryption':
+                return RSA::loadFormat('PKCS8', $key)->withPadding(RSA::SIGNATURE_PKCS1);
+            case 'id-ecPublicKey':
+            case 'id-Ed25519':
+            case 'id-Ed448':
+                return EC::loadFormat('PKCS8', $key);
+            case 'id-dsa':
+                return DSA::loadFormat('PKCS8', $key);
+        }
+
+        return false;
+    }
+
+    /**
+     * Load a Certificate Signing Request
+     *
+     * @param string $csr
+     * @param int $mode
+     * @return mixed
+     */
+    public function loadCSR($csr, $mode = self::FORMAT_AUTO_DETECT)
+    {
+        if (is_array($csr) && isset($csr['certificationRequestInfo'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            unset($this->signatureSubject);
+            $this->dn = $csr['certificationRequestInfo']['subject'];
+            if (!isset($this->dn)) {
+                return false;
+            }
+
+            $this->currentCert = $csr;
+            return $csr;
+        }
+
+        // see http://tools.ietf.org/html/rfc2986
+
+        if ($mode != self::FORMAT_DER) {
+            $newcsr = ASN1::extractBER($csr);
+            if ($mode == self::FORMAT_PEM && $csr == $newcsr) {
+                return false;
+            }
+            $csr = $newcsr;
+        }
+        $orig = $csr;
+
+        if ($csr === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $decoded = ASN1::decodeBER($csr);
+
+        if (!$decoded) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $csr = ASN1::asn1map($decoded[0], Maps\CertificationRequest::MAP);
+        if (!isset($csr) || $csr === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->mapInAttributes($csr, 'certificationRequestInfo/attributes');
+        $this->mapInDNs($csr, 'certificationRequestInfo/subject/rdnSequence');
+
+        $this->dn = $csr['certificationRequestInfo']['subject'];
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $key = $csr['certificationRequestInfo']['subjectPKInfo'];
+        $key = ASN1::encodeDER($key, Maps\SubjectPublicKeyInfo::MAP);
+        $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'] =
+            "-----BEGIN PUBLIC KEY-----\r\n" .
+            chunk_split(base64_encode($key), 64) .
+            "-----END PUBLIC KEY-----";
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $csr;
+
+        $this->publicKey = null;
+        $this->publicKey = $this->getPublicKey();
+
+        return $csr;
+    }
+
+    /**
+     * Save CSR request
+     *
+     * @param array $csr
+     * @param int $format optional
+     * @return string
+     */
+    public function saveCSR(array $csr, $format = self::FORMAT_PEM)
+    {
+        if (!is_array($csr) || !isset($csr['certificationRequestInfo'])) {
+            return false;
+        }
+
+        switch (true) {
+            case !($algorithm = $this->subArray($csr, 'certificationRequestInfo/subjectPKInfo/algorithm/algorithm')):
+            case is_object($csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
+                break;
+            default:
+                $csr['certificationRequestInfo']['subjectPKInfo'] = new Element(
+                    base64_decode(preg_replace('#-.+-|[\r\n]#', '', $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']))
+                );
+        }
+
+        $filters = [];
+        $filters['certificationRequestInfo']['subject']['rdnSequence']['value']
+            = ['type' => ASN1::TYPE_UTF8_STRING];
+
+        ASN1::setFilters($filters);
+
+        $this->mapOutDNs($csr, 'certificationRequestInfo/subject/rdnSequence');
+        $this->mapOutAttributes($csr, 'certificationRequestInfo/attributes');
+        $csr = ASN1::encodeDER($csr, Maps\CertificationRequest::MAP);
+
+        switch ($format) {
+            case self::FORMAT_DER:
+                return $csr;
+            // case self::FORMAT_PEM:
+            default:
+                return "-----BEGIN CERTIFICATE REQUEST-----\r\n" . chunk_split(Strings::base64_encode($csr), 64) . '-----END CERTIFICATE REQUEST-----';
+        }
+    }
+
+    /**
+     * Load a SPKAC CSR
+     *
+     * SPKAC's are produced by the HTML5 keygen element:
+     *
+     * https://developer.mozilla.org/en-US/docs/HTML/Element/keygen
+     *
+     * @param string $spkac
+     * @return mixed
+     */
+    public function loadSPKAC($spkac)
+    {
+        if (is_array($spkac) && isset($spkac['publicKeyAndChallenge'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            unset($this->signatureSubject);
+            $this->currentCert = $spkac;
+            return $spkac;
+        }
+
+        // see http://www.w3.org/html/wg/drafts/html/master/forms.html#signedpublickeyandchallenge
+
+        // OpenSSL produces SPKAC's that are preceded by the string SPKAC=
+        $temp = preg_replace('#(?:SPKAC=)|[ \r\n\\\]#', '', $spkac);
+        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? Strings::base64_decode($temp) : false;
+        if ($temp != false) {
+            $spkac = $temp;
+        }
+        $orig = $spkac;
+
+        if ($spkac === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $decoded = ASN1::decodeBER($spkac);
+
+        if (!$decoded) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $spkac = ASN1::asn1map($decoded[0], Maps\SignedPublicKeyAndChallenge::MAP);
+
+        if (!isset($spkac) || !is_array($spkac)) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $key = $spkac['publicKeyAndChallenge']['spki'];
+        $key = ASN1::encodeDER($key, Maps\SubjectPublicKeyInfo::MAP);
+        $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey'] =
+            "-----BEGIN PUBLIC KEY-----\r\n" .
+            chunk_split(base64_encode($key), 64) .
+            "-----END PUBLIC KEY-----";
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $spkac;
+
+        $this->publicKey = null;
+        $this->publicKey = $this->getPublicKey();
+
+        return $spkac;
+    }
+
+    /**
+     * Save a SPKAC CSR request
+     *
+     * @param array $spkac
+     * @param int $format optional
+     * @return string
+     */
+    public function saveSPKAC(array $spkac, $format = self::FORMAT_PEM)
+    {
+        if (!is_array($spkac) || !isset($spkac['publicKeyAndChallenge'])) {
+            return false;
+        }
+
+        $algorithm = $this->subArray($spkac, 'publicKeyAndChallenge/spki/algorithm/algorithm');
+        switch (true) {
+            case !$algorithm:
+            case is_object($spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']):
+                break;
+            default:
+                $spkac['publicKeyAndChallenge']['spki'] = new Element(
+                    base64_decode(preg_replace('#-.+-|[\r\n]#', '', $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']))
+                );
+        }
+
+        $spkac = ASN1::encodeDER($spkac, Maps\SignedPublicKeyAndChallenge::MAP);
+
+        switch ($format) {
+            case self::FORMAT_DER:
+                return $spkac;
+            // case self::FORMAT_PEM:
+            default:
+                // OpenSSL's implementation of SPKAC requires the SPKAC be preceded by SPKAC= and since there are pretty much
+                // no other SPKAC decoders phpseclib will use that same format
+                return 'SPKAC=' . Strings::base64_encode($spkac);
+        }
+    }
+
+    /**
+     * Load a Certificate Revocation List
+     *
+     * @param string $crl
+     * @param int $mode
+     * @return mixed
+     */
+    public function loadCRL($crl, $mode = self::FORMAT_AUTO_DETECT)
+    {
+        if (is_array($crl) && isset($crl['tbsCertList'])) {
+            $this->currentCert = $crl;
+            unset($this->signatureSubject);
+            return $crl;
+        }
+
+        if ($mode != self::FORMAT_DER) {
+            $newcrl = ASN1::extractBER($crl);
+            if ($mode == self::FORMAT_PEM && $crl == $newcrl) {
+                return false;
+            }
+            $crl = $newcrl;
+        }
+        $orig = $crl;
+
+        if ($crl === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $decoded = ASN1::decodeBER($crl);
+
+        if (!$decoded) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $crl = ASN1::asn1map($decoded[0], Maps\CertificateList::MAP);
+        if (!isset($crl) || $crl === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $this->mapInDNs($crl, 'tbsCertList/issuer/rdnSequence');
+        if ($this->isSubArrayValid($crl, 'tbsCertList/crlExtensions')) {
+            $this->mapInExtensions($crl, 'tbsCertList/crlExtensions');
+        }
+        if ($this->isSubArrayValid($crl, 'tbsCertList/revokedCertificates')) {
+            $rclist_ref = &$this->subArrayUnchecked($crl, 'tbsCertList/revokedCertificates');
+            if ($rclist_ref) {
+                $rclist = $crl['tbsCertList']['revokedCertificates'];
+                foreach ($rclist as $i => $extension) {
+                    if ($this->isSubArrayValid($rclist, "$i/crlEntryExtensions")) {
+                        $this->mapInExtensions($rclist_ref, "$i/crlEntryExtensions");
+                    }
+                }
+            }
+        }
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $crl;
+
+        return $crl;
+    }
+
+    /**
+     * Save Certificate Revocation List.
+     *
+     * @param array $crl
+     * @param int $format optional
+     * @return string
+     */
+    public function saveCRL(array $crl, $format = self::FORMAT_PEM)
+    {
+        if (!is_array($crl) || !isset($crl['tbsCertList'])) {
+            return false;
+        }
+
+        $filters = [];
+        $filters['tbsCertList']['issuer']['rdnSequence']['value']
+            = ['type' => ASN1::TYPE_UTF8_STRING];
+        $filters['tbsCertList']['signature']['parameters']
+            = ['type' => ASN1::TYPE_UTF8_STRING];
+        $filters['signatureAlgorithm']['parameters']
+            = ['type' => ASN1::TYPE_UTF8_STRING];
+
+        if (empty($crl['tbsCertList']['signature']['parameters'])) {
+            $filters['tbsCertList']['signature']['parameters']
+                = ['type' => ASN1::TYPE_NULL];
+        }
+
+        if (empty($crl['signatureAlgorithm']['parameters'])) {
+            $filters['signatureAlgorithm']['parameters']
+                = ['type' => ASN1::TYPE_NULL];
+        }
+
+        ASN1::setFilters($filters);
+
+        $this->mapOutDNs($crl, 'tbsCertList/issuer/rdnSequence');
+        $this->mapOutExtensions($crl, 'tbsCertList/crlExtensions');
+        $rclist = &$this->subArray($crl, 'tbsCertList/revokedCertificates');
+        if (is_array($rclist)) {
+            foreach ($rclist as $i => $extension) {
+                $this->mapOutExtensions($rclist, "$i/crlEntryExtensions");
+            }
+        }
+
+        $crl = ASN1::encodeDER($crl, Maps\CertificateList::MAP);
+
+        switch ($format) {
+            case self::FORMAT_DER:
+                return $crl;
+            // case self::FORMAT_PEM:
+            default:
+                return "-----BEGIN X509 CRL-----\r\n" . chunk_split(Strings::base64_encode($crl), 64) . '-----END X509 CRL-----';
+        }
+    }
+
+    /**
+     * Helper function to build a time field according to RFC 3280 section
+     *  - 4.1.2.5 Validity
+     *  - 5.1.2.4 This Update
+     *  - 5.1.2.5 Next Update
+     *  - 5.1.2.6 Revoked Certificates
+     * by choosing utcTime iff year of date given is before 2050 and generalTime else.
+     *
+     * @param string $date in format date('D, d M Y H:i:s O')
+     * @return array|Element
+     */
+    private function timeField($date)
+    {
+        if ($date instanceof Element) {
+            return $date;
+        }
+        $dateObj = new \DateTimeImmutable($date, new \DateTimeZone('GMT'));
+        $year = $dateObj->format('Y'); // the same way ASN1.php parses this
+        if ($year < 2050) {
+            return ['utcTime' => $date];
+        } else {
+            return ['generalTime' => $date];
+        }
+    }
+
+    /**
+     * Sign an X.509 certificate
+     *
+     * $issuer's private key needs to be loaded.
+     * $subject can be either an existing X.509 cert (if you want to resign it),
+     * a CSR or something with the DN and public key explicitly set.
+     *
+     * @return mixed
+     */
+    public function sign(X509 $issuer, X509 $subject)
+    {
+        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
+            return false;
+        }
+
+        if (isset($subject->publicKey) && !($subjectPublicKey = $subject->formatSubjectPublicKey())) {
+            return false;
+        }
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
+        $signatureAlgorithm = self::identifySignatureAlgorithm($issuer->privateKey);
+
+        if (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertificate'])) {
+            $this->currentCert = $subject->currentCert;
+            $this->currentCert['tbsCertificate']['signature'] = $signatureAlgorithm;
+            $this->currentCert['signatureAlgorithm'] = $signatureAlgorithm;
+
+            if (!empty($this->startDate)) {
+                $this->currentCert['tbsCertificate']['validity']['notBefore'] = $this->timeField($this->startDate);
+            }
+            if (!empty($this->endDate)) {
+                $this->currentCert['tbsCertificate']['validity']['notAfter'] = $this->timeField($this->endDate);
+            }
+            if (!empty($this->serialNumber)) {
+                $this->currentCert['tbsCertificate']['serialNumber'] = $this->serialNumber;
+            }
+            if (!empty($subject->dn)) {
+                $this->currentCert['tbsCertificate']['subject'] = $subject->dn;
+            }
+            if (!empty($subject->publicKey)) {
+                $this->currentCert['tbsCertificate']['subjectPublicKeyInfo'] = $subjectPublicKey;
+            }
+            $this->removeExtension('id-ce-authorityKeyIdentifier');
+            if (isset($subject->domains)) {
+                $this->removeExtension('id-ce-subjectAltName');
+            }
+        } elseif (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertList'])) {
+            return false;
+        } else {
+            if (!isset($subject->publicKey)) {
+                return false;
+            }
+
+            $startDate = new \DateTimeImmutable('now', new \DateTimeZone(@date_default_timezone_get()));
+            $startDate = !empty($this->startDate) ? $this->startDate : $startDate->format('D, d M Y H:i:s O');
+
+            $endDate = new \DateTimeImmutable('+1 year', new \DateTimeZone(@date_default_timezone_get()));
+            $endDate = !empty($this->endDate) ? $this->endDate : $endDate->format('D, d M Y H:i:s O');
+
+            /* "The serial number MUST be a positive integer"
+               "Conforming CAs MUST NOT use serialNumber values longer than 20 octets."
+                -- https://tools.ietf.org/html/rfc5280#section-4.1.2.2
+
+               for the integer to be positive the leading bit needs to be 0 hence the
+               application of a bitmap
+            */
+            $serialNumber = !empty($this->serialNumber) ?
+                $this->serialNumber :
+                new BigInteger(Random::string(20) & ("\x7F" . str_repeat("\xFF", 19)), 256);
+
+            $this->currentCert = [
+                'tbsCertificate' =>
+                    [
+                        'version' => 'v3',
+                        'serialNumber' => $serialNumber, // $this->setSerialNumber()
+                        'signature' => $signatureAlgorithm,
+                        'issuer' => false, // this is going to be overwritten later
+                        'validity' => [
+                            'notBefore' => $this->timeField($startDate), // $this->setStartDate()
+                            'notAfter' => $this->timeField($endDate)   // $this->setEndDate()
+                        ],
+                        'subject' => $subject->dn,
+                        'subjectPublicKeyInfo' => $subjectPublicKey
+                    ],
+                    'signatureAlgorithm' => $signatureAlgorithm,
+                    'signature'          => false // this is going to be overwritten later
+            ];
+
+            // Copy extensions from CSR.
+            $csrexts = $subject->getAttribute('pkcs-9-at-extensionRequest', 0);
+
+            if (!empty($csrexts)) {
+                $this->currentCert['tbsCertificate']['extensions'] = $csrexts;
+            }
+        }
+
+        $this->currentCert['tbsCertificate']['issuer'] = $issuer->dn;
+
+        if (isset($issuer->currentKeyIdentifier)) {
+            $this->setExtension('id-ce-authorityKeyIdentifier', [
+                    //'authorityCertIssuer' => array(
+                    //    array(
+                    //        'directoryName' => $issuer->dn
+                    //    )
+                    //),
+                    'keyIdentifier' => $issuer->currentKeyIdentifier
+                ]);
+            //$extensions = &$this->currentCert['tbsCertificate']['extensions'];
+            //if (isset($issuer->serialNumber)) {
+            //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
+            //}
+            //unset($extensions);
+        }
+
+        if (isset($subject->currentKeyIdentifier)) {
+            $this->setExtension('id-ce-subjectKeyIdentifier', $subject->currentKeyIdentifier);
+        }
+
+        $altName = [];
+
+        if (isset($subject->domains) && count($subject->domains)) {
+            $altName = array_map(['\phpseclib3\File\X509', 'dnsName'], $subject->domains);
+        }
+
+        if (isset($subject->ipAddresses) && count($subject->ipAddresses)) {
+            // should an IP address appear as the CN if no domain name is specified? idk
+            //$ips = count($subject->domains) ? $subject->ipAddresses : array_slice($subject->ipAddresses, 1);
+            $ipAddresses = [];
+            foreach ($subject->ipAddresses as $ipAddress) {
+                $encoded = $subject->ipAddress($ipAddress);
+                if ($encoded !== false) {
+                    $ipAddresses[] = $encoded;
+                }
+            }
+            if (count($ipAddresses)) {
+                $altName = array_merge($altName, $ipAddresses);
+            }
+        }
+
+        if (!empty($altName)) {
+            $this->setExtension('id-ce-subjectAltName', $altName);
+        }
+
+        if ($this->caFlag) {
+            $keyUsage = $this->getExtension('id-ce-keyUsage');
+            if (!$keyUsage) {
+                $keyUsage = [];
+            }
+
+            $this->setExtension(
+                'id-ce-keyUsage',
+                array_values(array_unique(array_merge($keyUsage, ['cRLSign', 'keyCertSign'])))
+            );
+
+            $basicConstraints = $this->getExtension('id-ce-basicConstraints');
+            if (!$basicConstraints) {
+                $basicConstraints = [];
+            }
+
+            $this->setExtension(
+                'id-ce-basicConstraints',
+                array_merge(['cA' => true], $basicConstraints),
+                true
+            );
+
+            if (!isset($subject->currentKeyIdentifier)) {
+                $this->setExtension('id-ce-subjectKeyIdentifier', $this->computeKeyIdentifier($this->currentCert), false, false);
+            }
+        }
+
+        // resync $this->signatureSubject
+        // save $tbsCertificate in case there are any \phpseclib3\File\ASN1\Element objects in it
+        $tbsCertificate = $this->currentCert['tbsCertificate'];
+        $this->loadX509($this->saveX509($this->currentCert));
+
+        $result = $this->currentCert;
+        $this->currentCert['signature'] = $result['signature'] = "\0" . $issuer->privateKey->sign($this->signatureSubject);
+        $result['tbsCertificate'] = $tbsCertificate;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a CSR
+     *
+     * @return mixed
+     */
+    public function signCSR()
+    {
+        if (!is_object($this->privateKey) || empty($this->dn)) {
+            return false;
+        }
+
+        $origPublicKey = $this->publicKey;
+        $this->publicKey = $this->privateKey->getPublicKey();
+        $publicKey = $this->formatSubjectPublicKey();
+        $this->publicKey = $origPublicKey;
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
+        $signatureAlgorithm = self::identifySignatureAlgorithm($this->privateKey);
+
+        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['certificationRequestInfo'])) {
+            $this->currentCert['signatureAlgorithm'] = $signatureAlgorithm;
+            if (!empty($this->dn)) {
+                $this->currentCert['certificationRequestInfo']['subject'] = $this->dn;
+            }
+            $this->currentCert['certificationRequestInfo']['subjectPKInfo'] = $publicKey;
+        } else {
+            $this->currentCert = [
+                'certificationRequestInfo' =>
+                    [
+                        'version' => 'v1',
+                        'subject' => $this->dn,
+                        'subjectPKInfo' => $publicKey
+                    ],
+                    'signatureAlgorithm' => $signatureAlgorithm,
+                    'signature'          => false // this is going to be overwritten later
+            ];
+        }
+
+        // resync $this->signatureSubject
+        // save $certificationRequestInfo in case there are any \phpseclib3\File\ASN1\Element objects in it
+        $certificationRequestInfo = $this->currentCert['certificationRequestInfo'];
+        $this->loadCSR($this->saveCSR($this->currentCert));
+
+        $result = $this->currentCert;
+        $this->currentCert['signature'] = $result['signature'] = "\0" . $this->privateKey->sign($this->signatureSubject);
+        $result['certificationRequestInfo'] = $certificationRequestInfo;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a SPKAC
+     *
+     * @return mixed
+     */
+    public function signSPKAC()
+    {
+        if (!is_object($this->privateKey)) {
+            return false;
+        }
+
+        $origPublicKey = $this->publicKey;
+        $this->publicKey = $this->privateKey->getPublicKey();
+        $publicKey = $this->formatSubjectPublicKey();
+        $this->publicKey = $origPublicKey;
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
+        $signatureAlgorithm = self::identifySignatureAlgorithm($this->privateKey);
+
+        // re-signing a SPKAC seems silly but since everything else supports re-signing why not?
+        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['publicKeyAndChallenge'])) {
+            $this->currentCert['signatureAlgorithm'] = $signatureAlgorithm;
+            $this->currentCert['publicKeyAndChallenge']['spki'] = $publicKey;
+            if (!empty($this->challenge)) {
+                // the bitwise AND ensures that the output is a valid IA5String
+                $this->currentCert['publicKeyAndChallenge']['challenge'] = $this->challenge & str_repeat("\x7F", strlen($this->challenge));
+            }
+        } else {
+            $this->currentCert = [
+                'publicKeyAndChallenge' =>
+                    [
+                        'spki' => $publicKey,
+                        // quoting <https://developer.mozilla.org/en-US/docs/Web/HTML/Element/keygen>,
+                        // "A challenge string that is submitted along with the public key. Defaults to an empty string if not specified."
+                        // both Firefox and OpenSSL ("openssl spkac -key private.key") behave this way
+                        // we could alternatively do this instead if we ignored the specs:
+                        // Random::string(8) & str_repeat("\x7F", 8)
+                        'challenge' => !empty($this->challenge) ? $this->challenge : ''
+                    ],
+                    'signatureAlgorithm' => $signatureAlgorithm,
+                    'signature'          => false // this is going to be overwritten later
+            ];
+        }
+
+        // resync $this->signatureSubject
+        // save $publicKeyAndChallenge in case there are any \phpseclib3\File\ASN1\Element objects in it
+        $publicKeyAndChallenge = $this->currentCert['publicKeyAndChallenge'];
+        $this->loadSPKAC($this->saveSPKAC($this->currentCert));
+
+        $result = $this->currentCert;
+        $this->currentCert['signature'] = $result['signature'] = "\0" . $this->privateKey->sign($this->signatureSubject);
+        $result['publicKeyAndChallenge'] = $publicKeyAndChallenge;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a CRL
+     *
+     * $issuer's private key needs to be loaded.
+     *
+     * @return mixed
+     */
+    public function signCRL(X509 $issuer, X509 $crl)
+    {
+        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
+            return false;
+        }
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
+        $signatureAlgorithm = self::identifySignatureAlgorithm($issuer->privateKey);
+
+        $thisUpdate = new \DateTimeImmutable('now', new \DateTimeZone(@date_default_timezone_get()));
+        $thisUpdate = !empty($this->startDate) ? $this->startDate : $thisUpdate->format('D, d M Y H:i:s O');
+
+        if (isset($crl->currentCert) && is_array($crl->currentCert) && isset($crl->currentCert['tbsCertList'])) {
+            $this->currentCert = $crl->currentCert;
+            $this->currentCert['tbsCertList']['signature'] = $signatureAlgorithm;
+            $this->currentCert['signatureAlgorithm'] = $signatureAlgorithm;
+        } else {
+            $this->currentCert = [
+                'tbsCertList' =>
+                    [
+                        'version' => 'v2',
+                        'signature' => $signatureAlgorithm,
+                        'issuer' => false, // this is going to be overwritten later
+                        'thisUpdate' => $this->timeField($thisUpdate) // $this->setStartDate()
+                    ],
+                    'signatureAlgorithm' => $signatureAlgorithm,
+                    'signature'          => false // this is going to be overwritten later
+            ];
+        }
+
+        $tbsCertList = &$this->currentCert['tbsCertList'];
+        $tbsCertList['issuer'] = $issuer->dn;
+        $tbsCertList['thisUpdate'] = $this->timeField($thisUpdate);
+
+        if (!empty($this->endDate)) {
+            $tbsCertList['nextUpdate'] = $this->timeField($this->endDate); // $this->setEndDate()
+        } else {
+            unset($tbsCertList['nextUpdate']);
+        }
+
+        if (!empty($this->serialNumber)) {
+            $crlNumber = $this->serialNumber;
+        } else {
+            $crlNumber = $this->getExtension('id-ce-cRLNumber');
+            // "The CRL number is a non-critical CRL extension that conveys a
+            //  monotonically increasing sequence number for a given CRL scope and
+            //  CRL issuer.  This extension allows users to easily determine when a
+            //  particular CRL supersedes another CRL."
+            // -- https://tools.ietf.org/html/rfc5280#section-5.2.3
+            $crlNumber = $crlNumber !== false ? $crlNumber->add(new BigInteger(1)) : null;
+        }
+
+        $this->removeExtension('id-ce-authorityKeyIdentifier');
+        $this->removeExtension('id-ce-issuerAltName');
+
+        // Be sure version >= v2 if some extension found.
+        $version = isset($tbsCertList['version']) ? $tbsCertList['version'] : 0;
+        if (!$version) {
+            if (!empty($tbsCertList['crlExtensions'])) {
+                $version = 'v2'; // v2.
+            } elseif (!empty($tbsCertList['revokedCertificates'])) {
+                foreach ($tbsCertList['revokedCertificates'] as $cert) {
+                    if (!empty($cert['crlEntryExtensions'])) {
+                        $version = 'v2'; // v2.
+                    }
+                }
+            }
+
+            if ($version) {
+                $tbsCertList['version'] = $version;
+            }
+        }
+
+        // Store additional extensions.
+        if (!empty($tbsCertList['version'])) { // At least v2.
+            if (!empty($crlNumber)) {
+                $this->setExtension('id-ce-cRLNumber', $crlNumber);
+            }
+
+            if (isset($issuer->currentKeyIdentifier)) {
+                $this->setExtension('id-ce-authorityKeyIdentifier', [
+                        //'authorityCertIssuer' => array(
+                        //    ]
+                        //        'directoryName' => $issuer->dn
+                        //    ]
+                        //),
+                        'keyIdentifier' => $issuer->currentKeyIdentifier
+                    ]);
+                //$extensions = &$tbsCertList['crlExtensions'];
+                //if (isset($issuer->serialNumber)) {
+                //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
+                //}
+                //unset($extensions);
+            }
+
+            $issuerAltName = $this->getExtension('id-ce-subjectAltName', $issuer->currentCert);
+
+            if ($issuerAltName !== false) {
+                $this->setExtension('id-ce-issuerAltName', $issuerAltName);
+            }
+        }
+
+        if (empty($tbsCertList['revokedCertificates'])) {
+            unset($tbsCertList['revokedCertificates']);
+        }
+
+        unset($tbsCertList);
+
+        // resync $this->signatureSubject
+        // save $tbsCertList in case there are any \phpseclib3\File\ASN1\Element objects in it
+        $tbsCertList = $this->currentCert['tbsCertList'];
+        $this->loadCRL($this->saveCRL($this->currentCert));
+
+        $result = $this->currentCert;
+        $this->currentCert['signature'] = $result['signature'] = "\0" . $issuer->privateKey->sign($this->signatureSubject);
+        $result['tbsCertList'] = $tbsCertList;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Identify signature algorithm from key settings
+     *
+     * @param PrivateKey $key
+     * @throws UnsupportedAlgorithmException if the algorithm is unsupported
+     * @return array
+     */
+    private static function identifySignatureAlgorithm(PrivateKey $key)
+    {
+        if ($key instanceof RSA) {
+            if ($key->getPadding() & RSA::SIGNATURE_PSS) {
+                $r = PSS::load($key->withPassword()->toString('PSS'));
+                return [
+                    'algorithm' => 'id-RSASSA-PSS',
+                    'parameters' => PSS::savePSSParams($r)
+                ];
+            }
+            switch ($key->getHash()) {
+                case 'md2':
+                case 'md5':
+                case 'sha1':
+                case 'sha224':
+                case 'sha256':
+                case 'sha384':
+                case 'sha512':
+                    return ['algorithm' => $key->getHash() . 'WithRSAEncryption'];
+            }
+            throw new UnsupportedAlgorithmException('The only supported hash algorithms for RSA are: md2, md5, sha1, sha224, sha256, sha384, sha512');
+        }
+
+        if ($key instanceof DSA) {
+            switch ($key->getHash()) {
+                case 'sha1':
+                case 'sha224':
+                case 'sha256':
+                    return ['algorithm' => 'id-dsa-with-' . $key->getHash()];
+            }
+            throw new UnsupportedAlgorithmException('The only supported hash algorithms for DSA are: sha1, sha224, sha256');
+        }
+
+        if ($key instanceof EC) {
+            switch ($key->getCurve()) {
+                case 'Ed25519':
+                case 'Ed448':
+                    return ['algorithm' => 'id-' . $key->getCurve()];
+            }
+            switch ($key->getHash()) {
+                case 'sha1':
+                case 'sha224':
+                case 'sha256':
+                case 'sha384':
+                case 'sha512':
+                    return ['algorithm' => 'ecdsa-with-' . strtoupper($key->getHash())];
+            }
+            throw new UnsupportedAlgorithmException('The only supported hash algorithms for EC are: sha1, sha224, sha256, sha384, sha512');
+        }
+
+        throw new UnsupportedAlgorithmException('The only supported public key classes are: RSA, DSA, EC');
+    }
+
+    /**
+     * Set certificate start date
+     *
+     * @param \DateTimeInterface|string $date
+     */
+    public function setStartDate($date)
+    {
+        if (!is_object($date) || !($date instanceof \DateTimeInterface)) {
+            $date = new \DateTimeImmutable($date, new \DateTimeZone(@date_default_timezone_get()));
+        }
+
+        $this->startDate = $date->format('D, d M Y H:i:s O');
+    }
+
+    /**
+     * Set certificate end date
+     *
+     * @param \DateTimeInterface|string $date
+     */
+    public function setEndDate($date)
+    {
+        /*
+          To indicate that a certificate has no well-defined expiration date,
+          the notAfter SHOULD be assigned the GeneralizedTime value of
+          99991231235959Z.
+
+          -- http://tools.ietf.org/html/rfc5280#section-4.1.2.5
+        */
+        if (is_string($date) && strtolower($date) === 'lifetime') {
+            $temp = '99991231235959Z';
+            $temp = chr(ASN1::TYPE_GENERALIZED_TIME) . ASN1::encodeLength(strlen($temp)) . $temp;
+            $this->endDate = new Element($temp);
+        } else {
+            if (!is_object($date) || !($date instanceof \DateTimeInterface)) {
+                $date = new \DateTimeImmutable($date, new \DateTimeZone(@date_default_timezone_get()));
+            }
+
+            $this->endDate = $date->format('D, d M Y H:i:s O');
+        }
+    }
+
+    /**
+     * Set Serial Number
+     *
+     * @param string $serial
+     * @param int $base optional
+     */
+    public function setSerialNumber($serial, $base = -256)
+    {
+        $this->serialNumber = new BigInteger($serial, $base);
+    }
+
+    /**
+     * Turns the certificate into a certificate authority
+     *
+     */
+    public function makeCA()
+    {
+        $this->caFlag = true;
+    }
+
+    /**
+     * Check for validity of subarray
+     *
+     * This is intended for use in conjunction with _subArrayUnchecked(),
+     * implementing the checks included in _subArray() but without copying
+     * a potentially large array by passing its reference by-value to is_array().
+     *
+     * @param array $root
+     * @param string $path
+     * @return boolean
+     */
+    private function isSubArrayValid(array $root, $path)
+    {
+        if (!is_array($root)) {
+            return false;
+        }
+
+        foreach (explode('/', $path) as $i) {
+            if (!is_array($root)) {
+                return false;
+            }
+
+            if (!isset($root[$i])) {
+                return true;
+            }
+
+            $root = $root[$i];
+        }
+
+        return true;
+    }
+
+    /**
+     * Get a reference to a subarray
+     *
+     * This variant of _subArray() does no is_array() checking,
+     * so $root should be checked with _isSubArrayValid() first.
+     *
+     * This is here for performance reasons:
+     * Passing a reference (i.e. $root) by-value (i.e. to is_array())
+     * creates a copy. If $root is an especially large array, this is expensive.
+     *
+     * @param array $root
+     * @param string $path  absolute path with / as component separator
+     * @param bool $create optional
+     * @return array|false
+     */
+    private function &subArrayUnchecked(array &$root, $path, $create = false)
+    {
+        $false = false;
+
+        foreach (explode('/', $path) as $i) {
+            if (!isset($root[$i])) {
+                if (!$create) {
+                    return $false;
+                }
+
+                $root[$i] = [];
+            }
+
+            $root = &$root[$i];
+        }
+
+        return $root;
+    }
+
+    /**
+     * Get a reference to a subarray
+     *
+     * @param array $root
+     * @param string $path  absolute path with / as component separator
+     * @param bool $create optional
+     * @return array|false
+     */
+    private function &subArray(array &$root = null, $path, $create = false)
+    {
+        $false = false;
+
+        if (!is_array($root)) {
+            return $false;
+        }
+
+        foreach (explode('/', $path) as $i) {
+            if (!is_array($root)) {
+                return $false;
+            }
+
+            if (!isset($root[$i])) {
+                if (!$create) {
+                    return $false;
+                }
+
+                $root[$i] = [];
+            }
+
+            $root = &$root[$i];
+        }
+
+        return $root;
+    }
+
+    /**
+     * Get a reference to an extension subarray
+     *
+     * @param array $root
+     * @param string $path optional absolute path with / as component separator
+     * @param bool $create optional
+     * @return array|false
+     */
+    private function &extensions(array &$root = null, $path = null, $create = false)
+    {
+        if (!isset($root)) {
+            $root = $this->currentCert;
+        }
+
+        switch (true) {
+            case !empty($path):
+            case !is_array($root):
+                break;
+            case isset($root['tbsCertificate']):
+                $path = 'tbsCertificate/extensions';
+                break;
+            case isset($root['tbsCertList']):
+                $path = 'tbsCertList/crlExtensions';
+                break;
+            case isset($root['certificationRequestInfo']):
+                $pth = 'certificationRequestInfo/attributes';
+                $attributes = &$this->subArray($root, $pth, $create);
+
+                if (is_array($attributes)) {
+                    foreach ($attributes as $key => $value) {
+                        if ($value['type'] == 'pkcs-9-at-extensionRequest') {
+                            $path = "$pth/$key/value/0";
+                            break 2;
+                        }
+                    }
+                    if ($create) {
+                        $key = count($attributes);
+                        $attributes[] = ['type' => 'pkcs-9-at-extensionRequest', 'value' => []];
+                        $path = "$pth/$key/value/0";
+                    }
+                }
+                break;
+        }
+
+        $extensions = &$this->subArray($root, $path, $create);
+
+        if (!is_array($extensions)) {
+            $false = false;
+            return $false;
+        }
+
+        return $extensions;
+    }
+
+    /**
+     * Remove an Extension
+     *
+     * @param string $id
+     * @param string $path optional
+     * @return bool
+     */
+    private function removeExtensionHelper($id, $path = null)
+    {
+        $extensions = &$this->extensions($this->currentCert, $path);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        $result = false;
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                unset($extensions[$key]);
+                $result = true;
+            }
+        }
+
+        $extensions = array_values($extensions);
+        // fix for https://bugs.php.net/75433 affecting PHP 7.2
+        if (!isset($extensions[0])) {
+            $extensions = array_splice($extensions, 0, 0);
+        }
+        return $result;
+    }
+
+    /**
+     * Get an Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $id
+     * @param array $cert optional
+     * @param string $path optional
+     * @return mixed
+     */
+    private function getExtensionHelper($id, array $cert = null, $path = null)
+    {
+        $extensions = $this->extensions($cert, $path);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                return $value['extnValue'];
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all extensions in use
+     *
+     * @param array $cert optional
+     * @param string $path optional
+     * @return array
+     */
+    private function getExtensionsHelper(array $cert = null, $path = null)
+    {
+        $exts = $this->extensions($cert, $path);
+        $extensions = [];
+
+        if (is_array($exts)) {
+            foreach ($exts as $extension) {
+                $extensions[] = $extension['extnId'];
+            }
+        }
+
+        return $extensions;
+    }
+
+    /**
+     * Set an Extension
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @param string $path optional
+     * @return bool
+     */
+    private function setExtensionHelper($id, $value, $critical = false, $replace = true, $path = null)
+    {
+        $extensions = &$this->extensions($this->currentCert, $path, true);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        $newext = ['extnId'  => $id, 'critical' => $critical, 'extnValue' => $value];
+
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                if (!$replace) {
+                    return false;
+                }
+
+                $extensions[$key] = $newext;
+                return true;
+            }
+        }
+
+        $extensions[] = $newext;
+        return true;
+    }
+
+    /**
+     * Remove a certificate, CSR or CRL Extension
+     *
+     * @param string $id
+     * @return bool
+     */
+    public function removeExtension($id)
+    {
+        return $this->removeExtensionHelper($id);
+    }
+
+    /**
+     * Get a certificate, CSR or CRL Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $id
+     * @param array $cert optional
+     * @param string $path
+     * @return mixed
+     */
+    public function getExtension($id, array $cert = null, $path = null)
+    {
+        return $this->getExtensionHelper($id, $cert, $path);
+    }
+
+    /**
+     * Returns a list of all extensions in use in certificate, CSR or CRL
+     *
+     * @param array $cert optional
+     * @param string $path optional
+     * @return array
+     */
+    public function getExtensions(array $cert = null, $path = null)
+    {
+        return $this->getExtensionsHelper($cert, $path);
+    }
+
+    /**
+     * Set a certificate, CSR or CRL Extension
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @return bool
+     */
+    public function setExtension($id, $value, $critical = false, $replace = true)
+    {
+        return $this->setExtensionHelper($id, $value, $critical, $replace);
+    }
+
+    /**
+     * Remove a CSR attribute.
+     *
+     * @param string $id
+     * @param int $disposition optional
+     * @return bool
+     */
+    public function removeAttribute($id, $disposition = self::ATTR_ALL)
+    {
+        $attributes = &$this->subArray($this->currentCert, 'certificationRequestInfo/attributes');
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        $result = false;
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == self::ATTR_APPEND:
+                    case $disposition == self::ATTR_REPLACE:
+                        return false;
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    case $disposition == self::ATTR_ALL:
+                    case $n == 1:
+                        unset($attributes[$key]);
+                        $result = true;
+                        break;
+                    default:
+                        unset($attributes[$key]['value'][$disposition]);
+                        $attributes[$key]['value'] = array_values($attributes[$key]['value']);
+                        $result = true;
+                        break;
+                }
+                if ($result && $disposition != self::ATTR_ALL) {
+                    break;
+                }
+            }
+        }
+
+        $attributes = array_values($attributes);
+        return $result;
+    }
+
+    /**
+     * Get a CSR attribute
+     *
+     * Returns the attribute if it exists and false if not
+     *
+     * @param string $id
+     * @param int $disposition optional
+     * @param array $csr optional
+     * @return mixed
+     */
+    public function getAttribute($id, $disposition = self::ATTR_ALL, array $csr = null)
+    {
+        if (empty($csr)) {
+            $csr = $this->currentCert;
+        }
+
+        $attributes = $this->subArray($csr, 'certificationRequestInfo/attributes');
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == self::ATTR_APPEND:
+                    case $disposition == self::ATTR_REPLACE:
+                        return false;
+                    case $disposition == self::ATTR_ALL:
+                        return $attribute['value'];
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    default:
+                        return $attribute['value'][$disposition];
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all CSR attributes in use
+     *
+     * @param array $csr optional
+     * @return array
+     */
+    public function getAttributes(array $csr = null)
+    {
+        if (empty($csr)) {
+            $csr = $this->currentCert;
+        }
+
+        $attributes = $this->subArray($csr, 'certificationRequestInfo/attributes');
+        $attrs = [];
+
+        if (is_array($attributes)) {
+            foreach ($attributes as $attribute) {
+                $attrs[] = $attribute['type'];
+            }
+        }
+
+        return $attrs;
+    }
+
+    /**
+     * Set a CSR attribute
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param int $disposition optional
+     * @return bool
+     */
+    public function setAttribute($id, $value, $disposition = self::ATTR_ALL)
+    {
+        $attributes = &$this->subArray($this->currentCert, 'certificationRequestInfo/attributes', true);
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        switch ($disposition) {
+            case self::ATTR_REPLACE:
+                $disposition = self::ATTR_APPEND;
+                // fall-through
+            case self::ATTR_ALL:
+                $this->removeAttribute($id);
+                break;
+        }
+
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == self::ATTR_APPEND:
+                        $last = $key;
+                        break;
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    default:
+                        $attributes[$key]['value'][$disposition] = $value;
+                        return true;
+                }
+            }
+        }
+
+        switch (true) {
+            case $disposition >= 0:
+                return false;
+            case isset($last):
+                $attributes[$last]['value'][] = $value;
+                break;
+            default:
+                $attributes[] = ['type' => $id, 'value' => $disposition == self::ATTR_ALL ? $value : [$value]];
+                break;
+        }
+
+        return true;
+    }
+
+    /**
+     * Sets the subject key identifier
+     *
+     * This is used by the id-ce-authorityKeyIdentifier and the id-ce-subjectKeyIdentifier extensions.
+     *
+     * @param string $value
+     */
+    public function setKeyIdentifier($value)
+    {
+        if (empty($value)) {
+            unset($this->currentKeyIdentifier);
+        } else {
+            $this->currentKeyIdentifier = $value;
+        }
+    }
+
+    /**
+     * Compute a public key identifier.
+     *
+     * Although key identifiers may be set to any unique value, this function
+     * computes key identifiers from public key according to the two
+     * recommended methods (4.2.1.2 RFC 3280).
+     * Highly polymorphic: try to accept all possible forms of key:
+     * - Key object
+     * - \phpseclib3\File\X509 object with public or private key defined
+     * - Certificate or CSR array
+     * - \phpseclib3\File\ASN1\Element object
+     * - PEM or DER string
+     *
+     * @param mixed $key optional
+     * @param int $method optional
+     * @return string binary key identifier
+     */
+    public function computeKeyIdentifier($key = null, $method = 1)
+    {
+        if (is_null($key)) {
+            $key = $this;
+        }
+
+        switch (true) {
+            case is_string($key):
+                break;
+            case is_array($key) && isset($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
+                return $this->computeKeyIdentifier($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'], $method);
+            case is_array($key) && isset($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
+                return $this->computeKeyIdentifier($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'], $method);
+            case !is_object($key):
+                return false;
+            case $key instanceof Element:
+                // Assume the element is a bitstring-packed key.
+                $decoded = ASN1::decodeBER($key->element);
+                if (!$decoded) {
+                    return false;
+                }
+                $raw = ASN1::asn1map($decoded[0], ['type' => ASN1::TYPE_BIT_STRING]);
+                if (empty($raw)) {
+                    return false;
+                }
+                // If the key is private, compute identifier from its corresponding public key.
+                $key = PublicKeyLoader::load($raw);
+                if ($key instanceof PrivateKey) {  // If private.
+                    return $this->computeKeyIdentifier($key, $method);
+                }
+                $key = $raw; // Is a public key.
+                break;
+            case $key instanceof X509:
+                if (isset($key->publicKey)) {
+                    return $this->computeKeyIdentifier($key->publicKey, $method);
+                }
+                if (isset($key->privateKey)) {
+                    return $this->computeKeyIdentifier($key->privateKey, $method);
+                }
+                if (isset($key->currentCert['tbsCertificate']) || isset($key->currentCert['certificationRequestInfo'])) {
+                    return $this->computeKeyIdentifier($key->currentCert, $method);
+                }
+                return false;
+            default: // Should be a key object (i.e.: \phpseclib3\Crypt\RSA).
+                $key = $key->getPublicKey();
+                break;
+        }
+
+        // If in PEM format, convert to binary.
+        $key = ASN1::extractBER($key);
+
+        // Now we have the key string: compute its sha-1 sum.
+        $hash = new Hash('sha1');
+        $hash = $hash->hash($key);
+
+        if ($method == 2) {
+            $hash = substr($hash, -8);
+            $hash[0] = chr((ord($hash[0]) & 0x0F) | 0x40);
+        }
+
+        return $hash;
+    }
+
+    /**
+     * Format a public key as appropriate
+     *
+     * @return array|false
+     */
+    private function formatSubjectPublicKey()
+    {
+        $format = $this->publicKey instanceof RSA && ($this->publicKey->getPadding() & RSA::SIGNATURE_PSS) ?
+            'PSS' :
+            'PKCS8';
+
+        $publicKey = base64_decode(preg_replace('#-.+-|[\r\n]#', '', $this->publicKey->toString($format)));
+
+        $decoded = ASN1::decodeBER($publicKey);
+        if (!$decoded) {
+            return false;
+        }
+        $mapped = ASN1::asn1map($decoded[0], Maps\SubjectPublicKeyInfo::MAP);
+        if (!is_array($mapped)) {
+            return false;
+        }
+
+        $mapped['subjectPublicKey'] = $this->publicKey->toString($format);
+
+        return $mapped;
+    }
+
+    /**
+     * Set the domain name's which the cert is to be valid for
+     *
+     * @param mixed ...$domains
+     * @return void
+     */
+    public function setDomain(...$domains)
+    {
+        $this->domains = $domains;
+        $this->removeDNProp('id-at-commonName');
+        $this->setDNProp('id-at-commonName', $this->domains[0]);
+    }
+
+    /**
+     * Set the IP Addresses's which the cert is to be valid for
+     *
+     * @param mixed[] ...$ipAddresses
+     */
+    public function setIPAddress(...$ipAddresses)
+    {
+        $this->ipAddresses = $ipAddresses;
+        /*
+        if (!isset($this->domains)) {
+            $this->removeDNProp('id-at-commonName');
+            $this->setDNProp('id-at-commonName', $this->ipAddresses[0]);
+        }
+        */
+    }
+
+    /**
+     * Helper function to build domain array
+     *
+     * @param string $domain
+     * @return array
+     */
+    private static function dnsName($domain)
+    {
+        return ['dNSName' => $domain];
+    }
+
+    /**
+     * Helper function to build IP Address array
+     *
+     * (IPv6 is not currently supported)
+     *
+     * @param string $address
+     * @return array
+     */
+    private function iPAddress($address)
+    {
+        return ['iPAddress' => $address];
+    }
+
+    /**
+     * Get the index of a revoked certificate.
+     *
+     * @param array $rclist
+     * @param string $serial
+     * @param bool $create optional
+     * @return int|false
+     */
+    private function revokedCertificate(array &$rclist, $serial, $create = false)
+    {
+        $serial = new BigInteger($serial);
+
+        foreach ($rclist as $i => $rc) {
+            if (!($serial->compare($rc['userCertificate']))) {
+                return $i;
+            }
+        }
+
+        if (!$create) {
+            return false;
+        }
+
+        $i = count($rclist);
+        $revocationDate = new \DateTimeImmutable('now', new \DateTimeZone(@date_default_timezone_get()));
+        $rclist[] = ['userCertificate' => $serial,
+                          'revocationDate'  => $this->timeField($revocationDate->format('D, d M Y H:i:s O'))];
+        return $i;
+    }
+
+    /**
+     * Revoke a certificate.
+     *
+     * @param string $serial
+     * @param string $date optional
+     * @return bool
+     */
+    public function revoke($serial, $date = null)
+    {
+        if (isset($this->currentCert['tbsCertList'])) {
+            if (is_array($rclist = &$this->subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
+                if ($this->revokedCertificate($rclist, $serial) === false) { // If not yet revoked
+                    if (($i = $this->revokedCertificate($rclist, $serial, true)) !== false) {
+                        if (!empty($date)) {
+                            $rclist[$i]['revocationDate'] = $this->timeField($date);
+                        }
+
+                        return true;
+                    }
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Unrevoke a certificate.
+     *
+     * @param string $serial
+     * @return bool
+     */
+    public function unrevoke($serial)
+    {
+        if (is_array($rclist = &$this->subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->revokedCertificate($rclist, $serial)) !== false) {
+                unset($rclist[$i]);
+                $rclist = array_values($rclist);
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get a revoked certificate.
+     *
+     * @param string $serial
+     * @return mixed
+     */
+    public function getRevoked($serial)
+    {
+        if (is_array($rclist = $this->subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->revokedCertificate($rclist, $serial)) !== false) {
+                return $rclist[$i];
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * List revoked certificates
+     *
+     * @param array $crl optional
+     * @return array|bool
+     */
+    public function listRevoked(array $crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (!isset($crl['tbsCertList'])) {
+            return false;
+        }
+
+        $result = [];
+
+        if (is_array($rclist = $this->subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            foreach ($rclist as $rc) {
+                $result[] = $rc['userCertificate']->toString();
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Remove a Revoked Certificate Extension
+     *
+     * @param string $serial
+     * @param string $id
+     * @return bool
+     */
+    public function removeRevokedCertificateExtension($serial, $id)
+    {
+        if (is_array($rclist = &$this->subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->revokedCertificate($rclist, $serial)) !== false) {
+                return $this->removeExtensionHelper($id, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get a Revoked Certificate Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $serial
+     * @param string $id
+     * @param array $crl optional
+     * @return mixed
+     */
+    public function getRevokedCertificateExtension($serial, $id, array $crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (is_array($rclist = $this->subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->revokedCertificate($rclist, $serial)) !== false) {
+                return $this->getExtension($id, $crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all extensions in use for a given revoked certificate
+     *
+     * @param string $serial
+     * @param array $crl optional
+     * @return array|bool
+     */
+    public function getRevokedCertificateExtensions($serial, array $crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (is_array($rclist = $this->subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->revokedCertificate($rclist, $serial)) !== false) {
+                return $this->getExtensions($crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Set a Revoked Certificate Extension
+     *
+     * @param string $serial
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @return bool
+     */
+    public function setRevokedCertificateExtension($serial, $id, $value, $critical = false, $replace = true)
+    {
+        if (isset($this->currentCert['tbsCertList'])) {
+            if (is_array($rclist = &$this->subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
+                if (($i = $this->revokedCertificate($rclist, $serial, true)) !== false) {
+                    return $this->setExtensionHelper($id, $value, $critical, $replace, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Register the mapping for a custom/unsupported extension.
+     *
+     * @param string $id
+     * @param array $mapping
+     */
+    public static function registerExtension($id, array $mapping)
+    {
+        if (isset(self::$extensions[$id]) && self::$extensions[$id] !== $mapping) {
+            throw new \RuntimeException(
+                'Extension ' . $id . ' has already been defined with a different mapping.'
+            );
+        }
+
+        self::$extensions[$id] = $mapping;
+    }
+
+    /**
+     * Register the mapping for a custom/unsupported extension.
+     *
+     * @param string $id
+     *
+     * @return array|null
+     */
+    public static function getRegisteredExtension($id)
+    {
+        return isset(self::$extensions[$id]) ? self::$extensions[$id] : null;
+    }
+
+    /**
+     * Register the mapping for a custom/unsupported extension.
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical
+     * @param bool $replace
+     */
+    public function setExtensionValue($id, $value, $critical = false, $replace = false)
+    {
+        $this->extensionValues[$id] = compact('critical', 'replace', 'value');
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,892 @@
+<?php
+
+/**
+ * Pure-PHP arbitrary precision integer arithmetic library.
+ *
+ * Supports base-2, base-10, base-16, and base-256 numbers.  Uses the GMP or BCMath extensions, if available,
+ * and an internal implementation, otherwise.
+ *
+ * PHP version 5 and 7
+ *
+ * Here's an example of how to use this library:
+ * <code>
+ * <?php
+ *    $a = new \phpseclib3\Math\BigInteger(2);
+ *    $b = new \phpseclib3\Math\BigInteger(3);
+ *
+ *    $c = $a->add($b);
+ *
+ *    echo $c->toString(); // outputs 5
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math;
+
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Math\BigInteger\Engines\Engine;
+
+/**
+ * Pure-PHP arbitrary precision integer arithmetic library. Supports base-2, base-10, base-16, and base-256
+ * numbers.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BigInteger implements \JsonSerializable
+{
+    /**
+     * Main Engine
+     *
+     * @var class-string<Engine>
+     */
+    private static $mainEngine;
+
+    /**
+     * Selected Engines
+     *
+     * @var list<string>
+     */
+    private static $engines;
+
+    /**
+     * The actual BigInteger object
+     *
+     * @var object
+     */
+    private $value;
+
+    /**
+     * Mode independent value used for serialization.
+     *
+     * @see self::__sleep()
+     * @see self::__wakeup()
+     * @var string
+     */
+    private $hex;
+
+    /**
+     * Precision (used only for serialization)
+     *
+     * @see self::__sleep()
+     * @see self::__wakeup()
+     * @var int
+     */
+    private $precision;
+
+    /**
+     * Sets engine type.
+     *
+     * Throws an exception if the type is invalid
+     *
+     * @param string $main
+     * @param list<string> $modexps optional
+     * @return void
+     */
+    public static function setEngine($main, array $modexps = ['DefaultEngine'])
+    {
+        self::$engines = [];
+
+        $fqmain = 'phpseclib3\\Math\\BigInteger\\Engines\\' . $main;
+        if (!class_exists($fqmain) || !method_exists($fqmain, 'isValidEngine')) {
+            throw new \InvalidArgumentException("$main is not a valid engine");
+        }
+        if (!$fqmain::isValidEngine()) {
+            throw new BadConfigurationException("$main is not setup correctly on this system");
+        }
+        /** @var class-string<Engine> $fqmain */
+        self::$mainEngine = $fqmain;
+
+        $found = false;
+        foreach ($modexps as $modexp) {
+            try {
+                $fqmain::setModExpEngine($modexp);
+                $found = true;
+                break;
+            } catch (\Exception $e) {
+            }
+        }
+
+        if (!$found) {
+            throw new BadConfigurationException("No valid modular exponentiation engine found for $main");
+        }
+
+        self::$engines = [$main, $modexp];
+    }
+
+    /**
+     * Returns the engine type
+     *
+     * @return string[]
+     */
+    public static function getEngine()
+    {
+        self::initialize_static_variables();
+
+        return self::$engines;
+    }
+
+    /**
+     * Initialize static variables
+     */
+    private static function initialize_static_variables()
+    {
+        if (!isset(self::$mainEngine)) {
+            $engines = [
+                ['GMP', ['DefaultEngine']],
+                ['PHP64', ['OpenSSL']],
+                ['BCMath', ['OpenSSL']],
+                ['PHP32', ['OpenSSL']],
+                ['PHP64', ['DefaultEngine']],
+                ['PHP32', ['DefaultEngine']]
+            ];
+
+            foreach ($engines as $engine) {
+                try {
+                    self::setEngine($engine[0], $engine[1]);
+                    return;
+                } catch (\Exception $e) {
+                }
+            }
+
+            throw new \UnexpectedValueException('No valid BigInteger found. This is only possible when JIT is enabled on Windows and neither the GMP or BCMath extensions are available so either disable JIT or install GMP / BCMath');
+        }
+    }
+
+    /**
+     * Converts base-2, base-10, base-16, and binary strings (base-256) to BigIntegers.
+     *
+     * If the second parameter - $base - is negative, then it will be assumed that the number's are encoded using
+     * two's compliment.  The sole exception to this is -10, which is treated the same as 10 is.
+     *
+     * @param string|int|Engine $x Base-10 number or base-$base number if $base set.
+     * @param int $base
+     */
+    public function __construct($x = 0, $base = 10)
+    {
+        self::initialize_static_variables();
+
+        if ($x instanceof self::$mainEngine) {
+            $this->value = clone $x;
+        } elseif ($x instanceof Engine) {
+            $this->value = new static("$x");
+            $this->value->setPrecision($x->getPrecision());
+        } else {
+            $this->value = new self::$mainEngine($x, $base);
+        }
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * @return string
+     */
+    public function toString()
+    {
+        return $this->value->toString();
+    }
+
+    /**
+     *  __toString() magic method
+     */
+    public function __toString()
+    {
+        return (string)$this->value;
+    }
+
+    /**
+     *  __debugInfo() magic method
+     *
+     * Will be called, automatically, when print_r() or var_dump() are called
+     */
+    public function __debugInfo()
+    {
+        return $this->value->__debugInfo();
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBytes($twos_compliment = false)
+    {
+        return $this->value->toBytes($twos_compliment);
+    }
+
+    /**
+     * Converts a BigInteger to a hex string (eg. base-16).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toHex($twos_compliment = false)
+    {
+        return $this->value->toHex($twos_compliment);
+    }
+
+    /**
+     * Converts a BigInteger to a bit string (eg. base-2).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBits($twos_compliment = false)
+    {
+        return $this->value->toBits($twos_compliment);
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * @param BigInteger $y
+     * @return BigInteger
+     */
+    public function add(BigInteger $y)
+    {
+        return new static($this->value->add($y->value));
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * @param BigInteger $y
+     * @return BigInteger
+     */
+    public function subtract(BigInteger $y)
+    {
+        return new static($this->value->subtract($y->value));
+    }
+
+    /**
+     * Multiplies two BigIntegers
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    public function multiply(BigInteger $x)
+    {
+        return new static($this->value->multiply($x->value));
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    $a = new \phpseclib3\Math\BigInteger('10');
+     *    $b = new \phpseclib3\Math\BigInteger('20');
+     *
+     *    list($quotient, $remainder) = $a->divide($b);
+     *
+     *    echo $quotient->toString(); // outputs 0
+     *    echo "\r\n";
+     *    echo $remainder->toString(); // outputs 10
+     * ?>
+     * </code>
+     *
+     * @param BigInteger $y
+     * @return BigInteger[]
+     */
+    public function divide(BigInteger $y)
+    {
+        list($q, $r) = $this->value->divide($y->value);
+        return [
+            new static($q),
+            new static($r)
+        ];
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * @param BigInteger $n
+     * @return BigInteger
+     */
+    public function modInverse(BigInteger $n)
+    {
+        return new static($this->value->modInverse($n->value));
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * @param BigInteger $n
+     * @return BigInteger[]
+     */
+    public function extendedGCD(BigInteger $n)
+    {
+        extract($this->value->extendedGCD($n->value));
+        /**
+         * @var BigInteger $gcd
+         * @var BigInteger $x
+         * @var BigInteger $y
+         */
+        return [
+            'gcd' => new static($gcd),
+            'x' => new static($x),
+            'y' => new static($y)
+        ];
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * @param BigInteger $n
+     * @return BigInteger
+     */
+    public function gcd(BigInteger $n)
+    {
+        return new static($this->value->gcd($n->value));
+    }
+
+    /**
+     * Absolute value.
+     *
+     * @return BigInteger
+     */
+    public function abs()
+    {
+        return new static($this->value->abs());
+    }
+
+    /**
+     * Set Precision
+     *
+     * Some bitwise operations give different results depending on the precision being used.  Examples include left
+     * shift, not, and rotates.
+     *
+     * @param int $bits
+     */
+    public function setPrecision($bits)
+    {
+        $this->value->setPrecision($bits);
+    }
+
+    /**
+     * Get Precision
+     *
+     * Returns the precision if it exists, false if it doesn't
+     *
+     * @return int|bool
+     */
+    public function getPrecision()
+    {
+        return $this->value->getPrecision();
+    }
+
+    /**
+     * Serialize
+     *
+     * Will be called, automatically, when serialize() is called on a BigInteger object.
+     *
+     * __sleep() / __wakeup() have been around since PHP 4.0
+     *
+     * \Serializable was introduced in PHP 5.1 and deprecated in PHP 8.1:
+     * https://wiki.php.net/rfc/phase_out_serializable
+     *
+     * __serialize() / __unserialize() were introduced in PHP 7.4:
+     * https://wiki.php.net/rfc/custom_object_serialization
+     *
+     * @return array
+     */
+    public function __sleep()
+    {
+        $this->hex = $this->toHex(true);
+        $vars = ['hex'];
+        if ($this->getPrecision() > 0) {
+            $vars[] = 'precision';
+        }
+        return $vars;
+    }
+
+    /**
+     * Serialize
+     *
+     * Will be called, automatically, when unserialize() is called on a BigInteger object.
+     */
+    public function __wakeup()
+    {
+        $temp = new static($this->hex, -16);
+        $this->value = $temp->value;
+        if ($this->precision > 0) {
+            // recalculate $this->bitmask
+            $this->setPrecision($this->precision);
+        }
+    }
+
+    /**
+     * JSON Serialize
+     *
+     * Will be called, automatically, when json_encode() is called on a BigInteger object.
+     *
+     * @return array{hex: string, precision?: int]
+     */
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize()
+    {
+        $result = ['hex' => $this->toHex(true)];
+        if ($this->precision > 0) {
+            $result['precision'] = $this->getPrecision();
+        }
+        return $result;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BigInteger $e
+     * @param BigInteger $n
+     * @return BigInteger
+     */
+    public function powMod(BigInteger $e, BigInteger $n)
+    {
+        return new static($this->value->powMod($e->value, $n->value));
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BigInteger $e
+     * @param BigInteger $n
+     * @return BigInteger
+     */
+    public function modPow(BigInteger $e, BigInteger $n)
+    {
+        return new static($this->value->modPow($e->value, $n->value));
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this
+     * is demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
+     *
+     * @param BigInteger $y
+     * @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @see self::equals()
+     */
+    public function compare(BigInteger $y)
+    {
+        return $this->value->compare($y->value);
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use BigInteger::compare()
+     *
+     * @param BigInteger $x
+     * @return bool
+     */
+    public function equals(BigInteger $x)
+    {
+        return $this->value->equals($x->value);
+    }
+
+    /**
+     * Logical Not
+     *
+     * @return BigInteger
+     */
+    public function bitwise_not()
+    {
+        return new static($this->value->bitwise_not());
+    }
+
+    /**
+     * Logical And
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    public function bitwise_and(BigInteger $x)
+    {
+        return new static($this->value->bitwise_and($x->value));
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    public function bitwise_or(BigInteger $x)
+    {
+        return new static($this->value->bitwise_or($x->value));
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param BigInteger $x
+     * @return BigInteger
+     */
+    public function bitwise_xor(BigInteger $x)
+    {
+        return new static($this->value->bitwise_xor($x->value));
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
+     *
+     * @param int $shift
+     * @return BigInteger
+     */
+    public function bitwise_rightShift($shift)
+    {
+        return new static($this->value->bitwise_rightShift($shift));
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
+     *
+     * @param int $shift
+     * @return BigInteger
+     */
+    public function bitwise_leftShift($shift)
+    {
+        return new static($this->value->bitwise_leftShift($shift));
+    }
+
+    /**
+     * Logical Left Rotate
+     *
+     * Instead of the top x bits being dropped they're appended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return BigInteger
+     */
+    public function bitwise_leftRotate($shift)
+    {
+        return new static($this->value->bitwise_leftRotate($shift));
+    }
+
+    /**
+     * Logical Right Rotate
+     *
+     * Instead of the bottom x bits being dropped they're prepended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return BigInteger
+     */
+    public function bitwise_rightRotate($shift)
+    {
+        return new static($this->value->bitwise_rightRotate($shift));
+    }
+
+    /**
+     * Returns the smallest and largest n-bit number
+     *
+     * @param int $bits
+     * @return BigInteger[]
+     */
+    public static function minMaxBits($bits)
+    {
+        self::initialize_static_variables();
+
+        $class = self::$mainEngine;
+        extract($class::minMaxBits($bits));
+        /** @var BigInteger $min
+         * @var BigInteger $max
+         */
+        return [
+            'min' => new static($min),
+            'max' => new static($max)
+        ];
+    }
+
+    /**
+     * Return the size of a BigInteger in bits
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return $this->value->getLength();
+    }
+
+    /**
+     * Return the size of a BigInteger in bytes
+     *
+     * @return int
+     */
+    public function getLengthInBytes()
+    {
+        return $this->value->getLengthInBytes();
+    }
+
+    /**
+     * Generates a random number of a certain size
+     *
+     * Bit length is equal to $size
+     *
+     * @param int $size
+     * @return BigInteger
+     */
+    public static function random($size)
+    {
+        self::initialize_static_variables();
+
+        $class = self::$mainEngine;
+        return new static($class::random($size));
+    }
+
+    /**
+     * Generates a random prime number of a certain size
+     *
+     * Bit length is equal to $size
+     *
+     * @param int $size
+     * @return BigInteger
+     */
+    public static function randomPrime($size)
+    {
+        self::initialize_static_variables();
+
+        $class = self::$mainEngine;
+        return new static($class::randomPrime($size));
+    }
+
+    /**
+     * Generate a random prime number between a range
+     *
+     * If there's not a prime within the given range, false will be returned.
+     *
+     * @param BigInteger $min
+     * @param BigInteger $max
+     * @return false|BigInteger
+     */
+    public static function randomRangePrime(BigInteger $min, BigInteger $max)
+    {
+        $class = self::$mainEngine;
+        return new static($class::randomRangePrime($min->value, $max->value));
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param BigInteger $min
+     * @param BigInteger $max
+     * @return BigInteger
+     */
+    public static function randomRange(BigInteger $min, BigInteger $max)
+    {
+        $class = self::$mainEngine;
+        return new static($class::randomRange($min->value, $max->value));
+    }
+
+    /**
+     * Checks a numer to see if it's prime
+     *
+     * Assuming the $t parameter is not set, this function has an error rate of 2**-80.  The main motivation for the
+     * $t parameter is distributability.  BigInteger::randomPrime() can be distributed across multiple pageloads
+     * on a website instead of just one.
+     *
+     * @param int|bool $t
+     * @return bool
+     */
+    public function isPrime($t = false)
+    {
+        return $this->value->isPrime($t);
+    }
+
+    /**
+     * Calculates the nth root of a biginteger.
+     *
+     * Returns the nth root of a positive biginteger, where n defaults to 2
+     *
+     * @param int $n optional
+     * @return BigInteger
+     */
+    public function root($n = 2)
+    {
+        return new static($this->value->root($n));
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param BigInteger $n
+     * @return BigInteger
+     */
+    public function pow(BigInteger $n)
+    {
+        return new static($this->value->pow($n->value));
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param BigInteger ...$nums
+     * @return BigInteger
+     */
+    public static function min(BigInteger ...$nums)
+    {
+        $class = self::$mainEngine;
+        $nums = array_map(function ($num) {
+            return $num->value;
+        }, $nums);
+        return new static($class::min(...$nums));
+    }
+
+    /**
+     * Return the maximum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param BigInteger ...$nums
+     * @return BigInteger
+     */
+    public static function max(BigInteger ...$nums)
+    {
+        $class = self::$mainEngine;
+        $nums = array_map(function ($num) {
+            return $num->value;
+        }, $nums);
+        return new static($class::max(...$nums));
+    }
+
+    /**
+     * Tests BigInteger to see if it is between two integers, inclusive
+     *
+     * @param BigInteger $min
+     * @param BigInteger $max
+     * @return bool
+     */
+    public function between(BigInteger $min, BigInteger $max)
+    {
+        return $this->value->between($min->value, $max->value);
+    }
+
+    /**
+     * Clone
+     */
+    public function __clone()
+    {
+        $this->value = clone $this->value;
+    }
+
+    /**
+     * Is Odd?
+     *
+     * @return bool
+     */
+    public function isOdd()
+    {
+        return $this->value->isOdd();
+    }
+
+    /**
+     * Tests if a bit is set
+     *
+     * @param int $x
+     * @return bool
+     */
+    public function testBit($x)
+    {
+        return $this->value->testBit($x);
+    }
+
+    /**
+     * Is Negative?
+     *
+     * @return bool
+     */
+    public function isNegative()
+    {
+        return $this->value->isNegative();
+    }
+
+    /**
+     * Negate
+     *
+     * Given $k, returns -$k
+     *
+     * @return BigInteger
+     */
+    public function negate()
+    {
+        return new static($this->value->negate());
+    }
+
+    /**
+     * Scan for 1 and right shift by that amount
+     *
+     * ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
+     *
+     * @param BigInteger $r
+     * @return int
+     */
+    public static function scan1divide(BigInteger $r)
+    {
+        $class = self::$mainEngine;
+        return $class::scan1divide($r->value);
+    }
+
+    /**
+     * Create Recurring Modulo Function
+     *
+     * Sometimes it may be desirable to do repeated modulos with the same number outside of
+     * modular exponentiation
+     *
+     * @return callable
+     */
+    public function createRecurringModuloFunction()
+    {
+        $func = $this->value->createRecurringModuloFunction();
+        return function (BigInteger $x) use ($func) {
+            return new static($func($x->value));
+        };
+    }
+
+    /**
+     * Bitwise Split
+     *
+     * Splits BigInteger's into chunks of $split bits
+     *
+     * @param int $split
+     * @return BigInteger[]
+     */
+    public function bitwise_split($split)
+    {
+        return array_map(function ($val) {
+            return new static($val);
+        }, $this->value->bitwise_split($split));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,697 @@
+<?php
+
+/**
+ * BCMath BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\BadConfigurationException;
+
+/**
+ * BCMath Engine.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BCMath extends Engine
+{
+    /**
+     * Can Bitwise operations be done fast?
+     *
+     * @see parent::bitwise_leftRotate()
+     * @see parent::bitwise_rightRotate()
+     */
+    const FAST_BITWISE = false;
+
+    /**
+     * Engine Directory
+     *
+     * @see parent::setModExpEngine
+     */
+    const ENGINE_DIR = 'BCMath';
+
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     * @see parent::__construct()
+     */
+    public static function isValidEngine()
+    {
+        return extension_loaded('bcmath');
+    }
+
+    /**
+     * Default constructor
+     *
+     * @param mixed $x integer Base-10 number or base-$base number if $base set.
+     * @param int $base
+     * @see parent::__construct()
+     */
+    public function __construct($x = 0, $base = 10)
+    {
+        if (!isset(static::$isValidEngine[static::class])) {
+            static::$isValidEngine[static::class] = self::isValidEngine();
+        }
+        if (!static::$isValidEngine[static::class]) {
+            throw new BadConfigurationException('BCMath is not setup correctly on this system');
+        }
+
+        $this->value = '0';
+
+        parent::__construct($x, $base);
+    }
+
+    /**
+     * Initialize a BCMath BigInteger Engine instance
+     *
+     * @param int $base
+     * @see parent::__construct()
+     */
+    protected function initialize($base)
+    {
+        switch (abs($base)) {
+            case 256:
+                // round $len to the nearest 4
+                $len = (strlen($this->value) + 3) & ~3;
+
+                $x = str_pad($this->value, $len, chr(0), STR_PAD_LEFT);
+
+                $this->value = '0';
+                for ($i = 0; $i < $len; $i += 4) {
+                    $this->value = bcmul($this->value, '4294967296', 0); // 4294967296 == 2**32
+                    $this->value = bcadd(
+                        $this->value,
+                        0x1000000 * ord($x[$i]) + ((ord($x[$i + 1]) << 16) | (ord(
+                            $x[$i + 2]
+                        ) << 8) | ord($x[$i + 3])),
+                        0
+                    );
+                }
+
+                if ($this->is_negative) {
+                    $this->value = '-' . $this->value;
+                }
+                break;
+            case 16:
+                $x = (strlen($this->value) & 1) ? '0' . $this->value : $this->value;
+                $temp = new self(Strings::hex2bin($x), 256);
+                $this->value = $this->is_negative ? '-' . $temp->value : $temp->value;
+                $this->is_negative = false;
+                break;
+            case 10:
+                // explicitly casting $x to a string is necessary, here, since doing $x[0] on -1 yields different
+                // results then doing it on '-1' does (modInverse does $x[0])
+                $this->value = $this->value === '-' ? '0' : (string)$this->value;
+        }
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * @return string
+     */
+    public function toString()
+    {
+        if ($this->value === '0') {
+            return '0';
+        }
+
+        return ltrim($this->value, '0');
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBytes($twos_compliment = false)
+    {
+        if ($twos_compliment) {
+            return $this->toBytesHelper();
+        }
+
+        $value = '';
+        $current = $this->value;
+
+        if ($current[0] == '-') {
+            $current = substr($current, 1);
+        }
+
+        while (bccomp($current, '0', 0) > 0) {
+            $temp = bcmod($current, '16777216');
+            $value = chr($temp >> 16) . chr($temp >> 8) . chr($temp) . $value;
+            $current = bcdiv($current, '16777216', 0);
+        }
+
+        return $this->precision > 0 ?
+            substr(str_pad($value, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
+            ltrim($value, chr(0));
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * @param BCMath $y
+     * @return BCMath
+     */
+    public function add(BCMath $y)
+    {
+        $temp = new self();
+        $temp->value = bcadd($this->value, $y->value);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * @param BCMath $y
+     * @return BCMath
+     */
+    public function subtract(BCMath $y)
+    {
+        $temp = new self();
+        $temp->value = bcsub($this->value, $y->value);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Multiplies two BigIntegers.
+     *
+     * @param BCMath $x
+     * @return BCMath
+     */
+    public function multiply(BCMath $x)
+    {
+        $temp = new self();
+        $temp->value = bcmul($this->value, $x->value);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * @param BCMath $y
+     * @return array{static, static}
+     */
+    public function divide(BCMath $y)
+    {
+        $quotient = new self();
+        $remainder = new self();
+
+        $quotient->value = bcdiv($this->value, $y->value, 0);
+        $remainder->value = bcmod($this->value, $y->value);
+
+        if ($remainder->value[0] == '-') {
+            $remainder->value = bcadd($remainder->value, $y->value[0] == '-' ? substr($y->value, 1) : $y->value, 0);
+        }
+
+        return [$this->normalize($quotient), $this->normalize($remainder)];
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * @param BCMath $n
+     * @return false|BCMath
+     */
+    public function modInverse(BCMath $n)
+    {
+        return $this->modInverseHelper($n);
+    }
+
+    /**
+     * Calculates the greatest common divisor and Bezout's identity.
+     *
+     * Say you have 693 and 609.  The GCD is 21.  Bezout's identity states that there exist integers x and y such that
+     * 693*x + 609*y == 21.  In point of fact, there are actually an infinite number of x and y combinations and which
+     * combination is returned is dependent upon which mode is in use.  See
+     * {@link http://en.wikipedia.org/wiki/B%C3%A9zout%27s_identity Bezout's identity - Wikipedia} for more information.
+     *
+     * @param BCMath $n
+     * @return array{gcd: static, x: static, y: static}
+     */
+    public function extendedGCD(BCMath $n)
+    {
+        // it might be faster to use the binary xGCD algorithim here, as well, but (1) that algorithim works
+        // best when the base is a power of 2 and (2) i don't think it'd make much difference, anyway.  as is,
+        // the basic extended euclidean algorithim is what we're using.
+
+        $u = $this->value;
+        $v = $n->value;
+
+        $a = '1';
+        $b = '0';
+        $c = '0';
+        $d = '1';
+
+        while (bccomp($v, '0', 0) != 0) {
+            $q = bcdiv($u, $v, 0);
+
+            $temp = $u;
+            $u = $v;
+            $v = bcsub($temp, bcmul($v, $q, 0), 0);
+
+            $temp = $a;
+            $a = $c;
+            $c = bcsub($temp, bcmul($a, $q, 0), 0);
+
+            $temp = $b;
+            $b = $d;
+            $d = bcsub($temp, bcmul($b, $q, 0), 0);
+        }
+
+        return [
+            'gcd' => $this->normalize(new static($u)),
+            'x' => $this->normalize(new static($a)),
+            'y' => $this->normalize(new static($b))
+        ];
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * @param BCMath $n
+     * @return BCMath
+     */
+    public function gcd(BCMath $n)
+    {
+        extract($this->extendedGCD($n));
+        /** @var BCMath $gcd */
+        return $gcd;
+    }
+
+    /**
+     * Absolute value.
+     *
+     * @return BCMath
+     */
+    public function abs()
+    {
+        $temp = new static();
+        $temp->value = strlen($this->value) && $this->value[0] == '-' ?
+            substr($this->value, 1) :
+            $this->value;
+
+        return $temp;
+    }
+
+    /**
+     * Logical And
+     *
+     * @param BCMath $x
+     * @return BCMath
+     */
+    public function bitwise_and(BCMath $x)
+    {
+        return $this->bitwiseAndHelper($x);
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param BCMath $x
+     * @return BCMath
+     */
+    public function bitwise_or(BCMath $x)
+    {
+        return $this->bitwiseOrHelper($x);
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param BCMath $x
+     * @return BCMath
+     */
+    public function bitwise_xor(BCMath $x)
+    {
+        return $this->bitwiseXorHelper($x);
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
+     *
+     * @param int $shift
+     * @return BCMath
+     */
+    public function bitwise_rightShift($shift)
+    {
+        $temp = new static();
+        $temp->value = bcdiv($this->value, bcpow('2', $shift, 0), 0);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
+     *
+     * @param int $shift
+     * @return BCMath
+     */
+    public function bitwise_leftShift($shift)
+    {
+        $temp = new static();
+        $temp->value = bcmul($this->value, bcpow('2', $shift, 0), 0);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this
+     * is demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
+     *
+     * @param BCMath $y
+     * @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @see self::equals()
+     */
+    public function compare(BCMath $y)
+    {
+        return bccomp($this->value, $y->value, 0);
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use BigInteger::compare()
+     *
+     * @param BCMath $x
+     * @return bool
+     */
+    public function equals(BCMath $x)
+    {
+        return $this->value == $x->value;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BCMath $e
+     * @param BCMath $n
+     * @return BCMath
+     */
+    public function modPow(BCMath $e, BCMath $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Alias for modPow().
+     *
+     * @param BCMath $e
+     * @param BCMath $n
+     * @return BCMath
+     */
+    public function powMod(BCMath $e, BCMath $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BCMath $e
+     * @param BCMath $n
+     * @return BCMath
+     */
+    protected function powModInner(BCMath $e, BCMath $n)
+    {
+        try {
+            $class = static::$modexpEngine[static::class];
+            return $class::powModHelper($this, $e, $n, static::class);
+        } catch (\Exception $err) {
+            return BCMath\DefaultEngine::powModHelper($this, $e, $n, static::class);
+        }
+    }
+
+    /**
+     * Normalize
+     *
+     * Removes leading zeros and truncates (if necessary) to maintain the appropriate precision
+     *
+     * @param BCMath $result
+     * @return BCMath
+     */
+    protected function normalize(BCMath $result)
+    {
+        $result->precision = $this->precision;
+        $result->bitmask = $this->bitmask;
+
+        if ($result->bitmask !== false) {
+            $result->value = bcmod($result->value, $result->bitmask->value);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Generate a random prime number between a range
+     *
+     * If there's not a prime within the given range, false will be returned.
+     *
+     * @param BCMath $min
+     * @param BCMath $max
+     * @return false|BCMath
+     */
+    public static function randomRangePrime(BCMath $min, BCMath $max)
+    {
+        return self::randomRangePrimeOuter($min, $max);
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param BCMath $min
+     * @param BCMath $max
+     * @return BCMath
+     */
+    public static function randomRange(BCMath $min, BCMath $max)
+    {
+        return self::randomRangeHelper($min, $max);
+    }
+
+    /**
+     * Make the current number odd
+     *
+     * If the current number is odd it'll be unchanged.  If it's even, one will be added to it.
+     *
+     * @see self::randomPrime()
+     */
+    protected function make_odd()
+    {
+        if (!$this->isOdd()) {
+            $this->value = bcadd($this->value, '1');
+        }
+    }
+
+    /**
+     * Test the number against small primes.
+     *
+     * @see self::isPrime()
+     */
+    protected function testSmallPrimes()
+    {
+        if ($this->value === '1') {
+            return false;
+        }
+        if ($this->value === '2') {
+            return true;
+        }
+        if ($this->value[strlen($this->value) - 1] % 2 == 0) {
+            return false;
+        }
+
+        $value = $this->value;
+
+        foreach (self::PRIMES as $prime) {
+            $r = bcmod($this->value, $prime);
+            if ($r == '0') {
+                return $this->value == $prime;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Scan for 1 and right shift by that amount
+     *
+     * ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
+     *
+     * @param BCMath $r
+     * @return int
+     * @see self::isPrime()
+     */
+    public static function scan1divide(BCMath $r)
+    {
+        $r_value = &$r->value;
+        $s = 0;
+        // if $n was 1, $r would be 0 and this would be an infinite loop, hence our $this->equals(static::$one[static::class]) check earlier
+        while ($r_value[strlen($r_value) - 1] % 2 == 0) {
+            $r_value = bcdiv($r_value, '2', 0);
+            ++$s;
+        }
+
+        return $s;
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param BCMath $n
+     * @return BCMath
+     */
+    public function pow(BCMath $n)
+    {
+        $temp = new self();
+        $temp->value = bcpow($this->value, $n->value);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param BCMath ...$nums
+     * @return BCMath
+     */
+    public static function min(BCMath ...$nums)
+    {
+        return self::minHelper($nums);
+    }
+
+    /**
+     * Return the maximum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param BCMath ...$nums
+     * @return BCMath
+     */
+    public static function max(BCMath ...$nums)
+    {
+        return self::maxHelper($nums);
+    }
+
+    /**
+     * Tests BigInteger to see if it is between two integers, inclusive
+     *
+     * @param BCMath $min
+     * @param BCMath $max
+     * @return bool
+     */
+    public function between(BCMath $min, BCMath $max)
+    {
+        return $this->compare($min) >= 0 && $this->compare($max) <= 0;
+    }
+
+    /**
+     * Set Bitmask
+     *
+     * @param int $bits
+     * @return Engine
+     * @see self::setPrecision()
+     */
+    protected static function setBitmask($bits)
+    {
+        $temp = parent::setBitmask($bits);
+        return $temp->add(static::$one[static::class]);
+    }
+
+    /**
+     * Is Odd?
+     *
+     * @return bool
+     */
+    public function isOdd()
+    {
+        return $this->value[strlen($this->value) - 1] % 2 == 1;
+    }
+
+    /**
+     * Tests if a bit is set
+     *
+     * @return bool
+     */
+    public function testBit($x)
+    {
+        return bccomp(
+            bcmod($this->value, bcpow('2', $x + 1, 0)),
+            bcpow('2', $x, 0),
+            0
+        ) >= 0;
+    }
+
+    /**
+     * Is Negative?
+     *
+     * @return bool
+     */
+    public function isNegative()
+    {
+        return strlen($this->value) && $this->value[0] == '-';
+    }
+
+    /**
+     * Negate
+     *
+     * Given $k, returns -$k
+     *
+     * @return BCMath
+     */
+    public function negate()
+    {
+        $temp = clone $this;
+
+        if (!strlen($temp->value)) {
+            return $temp;
+        }
+
+        $temp->value = $temp->value[0] == '-' ?
+            substr($this->value, 1) :
+            '-' . $this->value;
+
+        return $temp;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Base.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,110 @@
+<?php
+
+/**
+ * Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath;
+
+/**
+ * Sliding Window Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Base extends BCMath
+{
+    /**
+     * Cache constants
+     *
+     * $cache[self::VARIABLE] tells us whether or not the cached data is still valid.
+     *
+     */
+    const VARIABLE = 0;
+    /**
+     * $cache[self::DATA] contains the cached data.
+     *
+     */
+    const DATA = 1;
+
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return static::class != __CLASS__;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BCMath $x
+     * @param BCMath $e
+     * @param BCMath $n
+     * @param string $class
+     * @return BCMath
+     */
+    protected static function powModHelper(BCMath $x, BCMath $e, BCMath $n, $class)
+    {
+        if (empty($e->value)) {
+            $temp = new $class();
+            $temp->value = '1';
+            return $x->normalize($temp);
+        }
+
+        return $x->normalize(static::slidingWindow($x, $e, $n, $class));
+    }
+
+    /**
+     * Modular reduction preparation
+     *
+     * @param string $x
+     * @param string $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return string
+     */
+    protected static function prepareReduce($x, $n, $class)
+    {
+        return static::reduce($x, $n);
+    }
+
+    /**
+     * Modular multiply
+     *
+     * @param string $x
+     * @param string $y
+     * @param string $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return string
+     */
+    protected static function multiplyReduce($x, $y, $n, $class)
+    {
+        return static::reduce(bcmul($x, $y), $n);
+    }
+
+    /**
+     * Modular square
+     *
+     * @param string $x
+     * @param string $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return string
+     */
+    protected static function squareReduce($x, $n, $class)
+    {
+        return static::reduce(bcmul($x, $x), $n);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/BuiltIn.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/BuiltIn.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/BuiltIn.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * Built-In BCMath Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath;
+
+/**
+ * Built-In BCMath Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class BuiltIn extends BCMath
+{
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param BCMath $x
+     * @param BCMath $e
+     * @param BCMath $n
+     * @return BCMath
+     */
+    protected static function powModHelper(BCMath $x, BCMath $e, BCMath $n)
+    {
+        $temp = new BCMath();
+        $temp->value = bcpowmod($x->value, $e->value, $n->value);
+
+        return $x->normalize($temp);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/DefaultEngine.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * BCMath Default Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath\Reductions\Barrett;
+
+/**
+ * PHP Default Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DefaultEngine extends Barrett
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/OpenSSL.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath;
+
+use phpseclib3\Math\BigInteger\Engines\OpenSSL as Progenitor;
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSL extends Progenitor
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/Barrett.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/Barrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/Barrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,187 @@
+<?php
+
+/**
+ * BCMath Barrett Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath\Base;
+
+/**
+ * PHP Barrett Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Barrett extends Base
+{
+    /**
+     * Cache constants
+     *
+     * $cache[self::VARIABLE] tells us whether or not the cached data is still valid.
+     *
+     */
+    const VARIABLE = 0;
+    /**
+     * $cache[self::DATA] contains the cached data.
+     *
+     */
+    const DATA = 1;
+
+    /**
+     * Barrett Modular Reduction
+     *
+     * See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=14 HAC 14.3.3} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=165 MPM 6.2.5} for more information.  Modified slightly,
+     * so as not to require negative numbers (initially, this script didn't support negative numbers).
+     *
+     * Employs "folding", as described at
+     * {@link http://www.cosic.esat.kuleuven.be/publications/thesis-149.pdf#page=66 thesis-149.pdf#page=66}.  To quote from
+     * it, "the idea [behind folding] is to find a value x' such that x (mod m) = x' (mod m), with x' being smaller than x."
+     *
+     * Unfortunately, the "Barrett Reduction with Folding" algorithm described in thesis-149.pdf is not, as written, all that
+     * usable on account of (1) its not using reasonable radix points as discussed in
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=162 MPM 6.2.2} and (2) the fact that, even with reasonable
+     * radix points, it only works when there are an even number of digits in the denominator.  The reason for (2) is that
+     * (x >> 1) + (x >> 1) != x / 2 + x / 2.  If x is even, they're the same, but if x is odd, they're not.  See the in-line
+     * comments for details.
+     *
+     * @param string $n
+     * @param string $m
+     * @return string
+     */
+    protected static function reduce($n, $m)
+    {
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        $m_length = strlen($m);
+
+        if (strlen($n) >= 2 * $m_length) {
+            return bcmod($n, $m);
+        }
+
+        // if (m.length >> 1) + 2 <= m.length then m is too small and n can't be reduced
+        if ($m_length < 5) {
+            return self::regularBarrett($n, $m);
+        }
+        // n = 2 * m.length
+
+        if (($key = array_search($m, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $m;
+
+            $lhs = '1' . str_repeat('0', $m_length + ($m_length >> 1));
+            $u = bcdiv($lhs, $m, 0);
+            $m1 = bcsub($lhs, bcmul($u, $m));
+
+            $cache[self::DATA][] = [
+                'u' => $u, // m.length >> 1 (technically (m.length >> 1) + 1)
+                'm1' => $m1 // m.length
+            ];
+        } else {
+            extract($cache[self::DATA][$key]);
+        }
+
+        $cutoff = $m_length + ($m_length >> 1);
+
+        $lsd = substr($n, -$cutoff);
+        $msd = substr($n, 0, -$cutoff);
+
+        $temp = bcmul($msd, $m1); // m.length + (m.length >> 1)
+        $n = bcadd($lsd, $temp); // m.length + (m.length >> 1) + 1 (so basically we're adding two same length numbers)
+        //if ($m_length & 1) {
+        //    return self::regularBarrett($n, $m);
+        //}
+
+        // (m.length + (m.length >> 1) + 1) - (m.length - 1) == (m.length >> 1) + 2
+        $temp = substr($n, 0, -$m_length + 1);
+        // if even: ((m.length >> 1) + 2) + (m.length >> 1) == m.length + 2
+        // if odd:  ((m.length >> 1) + 2) + (m.length >> 1) == (m.length - 1) + 2 == m.length + 1
+        $temp = bcmul($temp, $u);
+        // if even: (m.length + 2) - ((m.length >> 1) + 1) = m.length - (m.length >> 1) + 1
+        // if odd:  (m.length + 1) - ((m.length >> 1) + 1) = m.length - (m.length >> 1)
+        $temp = substr($temp, 0, -($m_length >> 1) - 1);
+        // if even: (m.length - (m.length >> 1) + 1) + m.length = 2 * m.length - (m.length >> 1) + 1
+        // if odd:  (m.length - (m.length >> 1)) + m.length     = 2 * m.length - (m.length >> 1)
+        $temp = bcmul($temp, $m);
+
+        // at this point, if m had an odd number of digits, we'd be subtracting a 2 * m.length - (m.length >> 1) digit
+        // number from a m.length + (m.length >> 1) + 1 digit number.  ie. there'd be an extra digit and the while loop
+        // following this comment would loop a lot (hence our calling _regularBarrett() in that situation).
+
+        $result = bcsub($n, $temp);
+
+        //if (bccomp($result, '0') < 0) {
+        if ($result[0] == '-') {
+            $temp = '1' . str_repeat('0', $m_length + 1);
+            $result = bcadd($result, $temp);
+        }
+
+        while (bccomp($result, $m) >= 0) {
+            $result = bcsub($result, $m);
+        }
+
+        return $result;
+    }
+
+    /**
+     * (Regular) Barrett Modular Reduction
+     *
+     * For numbers with more than four digits BigInteger::_barrett() is faster.  The difference between that and this
+     * is that this function does not fold the denominator into a smaller form.
+     *
+     * @param string $x
+     * @param string $n
+     * @return string
+     */
+    private static function regularBarrett($x, $n)
+    {
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        $n_length = strlen($n);
+
+        if (strlen($x) > 2 * $n_length) {
+            return bcmod($x, $n);
+        }
+
+        if (($key = array_search($n, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $n;
+            $lhs = '1' . str_repeat('0', 2 * $n_length);
+            $cache[self::DATA][] = bcdiv($lhs, $n, 0);
+        }
+
+        $temp = substr($x, 0, -$n_length + 1);
+        $temp = bcmul($temp, $cache[self::DATA][$key]);
+        $temp = substr($temp, 0, -$n_length - 1);
+
+        $r1 = substr($x, -$n_length - 1);
+        $r2 = substr(bcmul($temp, $n), -$n_length - 1);
+        $result = bcsub($r1, $r2);
+
+        //if (bccomp($result, '0') < 0) {
+        if ($result[0] == '-') {
+            $q = '1' . str_repeat('0', $n_length + 1);
+            $result = bcadd($result, $q);
+        }
+
+        while (bccomp($result, $n) >= 0) {
+            $result = bcsub($result, $n);
+        }
+
+        return $result;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,108 @@
+<?php
+
+/**
+ * BCMath Dynamic Barrett Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\BCMath\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\BCMath;
+use phpseclib3\Math\BigInteger\Engines\BCMath\Base;
+
+/**
+ * PHP Barrett Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EvalBarrett extends Base
+{
+    /**
+     * Custom Reduction Function
+     *
+     * @see self::generateCustomReduction
+     */
+    private static $custom_reduction;
+
+    /**
+     * Barrett Modular Reduction
+     *
+     * This calls a dynamically generated loop unrolled function that's specific to a given modulo.
+     * Array lookups are avoided as are if statements testing for how many bits the host OS supports, etc.
+     *
+     * @param string $n
+     * @param string $m
+     * @return string
+     */
+    protected static function reduce($n, $m)
+    {
+        $inline = self::$custom_reduction;
+        return $inline($n);
+    }
+
+    /**
+     * Generate Custom Reduction
+     *
+     * @param BCMath $m
+     * @param string $class
+     * @return callable|void
+     */
+    protected static function generateCustomReduction(BCMath $m, $class)
+    {
+        $m_length = strlen($m);
+
+        if ($m_length < 5) {
+            $code = 'return bcmod($x, $n);';
+            eval('$func = function ($n) { ' . $code . '};');
+            self::$custom_reduction = $func;
+            return;
+        }
+
+        $lhs = '1' . str_repeat('0', $m_length + ($m_length >> 1));
+        $u = bcdiv($lhs, $m, 0);
+        $m1 = bcsub($lhs, bcmul($u, $m));
+
+        $cutoff = $m_length + ($m_length >> 1);
+
+        $m = "'$m'";
+        $u = "'$u'";
+        $m1 = "'$m1'";
+
+        $code = '
+            $lsd = substr($n, -' . $cutoff . ');
+            $msd = substr($n, 0, -' . $cutoff . ');
+
+            $temp = bcmul($msd, ' . $m1 . ');
+            $n = bcadd($lsd, $temp);
+
+            $temp = substr($n, 0, ' . (-$m_length + 1) . ');
+            $temp = bcmul($temp, ' . $u . ');
+            $temp = substr($temp, 0, ' . (-($m_length >> 1) - 1) . ');
+            $temp = bcmul($temp, ' . $m . ');
+
+            $result = bcsub($n, $temp);
+
+            if ($result[0] == \'-\') {
+                $temp = \'1' . str_repeat('0', $m_length + 1) . '\';
+                $result = bcadd($result, $temp);
+            }
+
+            while (bccomp($result, ' . $m . ') >= 0) {
+                $result = bcsub($result, ' . $m . ');
+            }
+
+            return $result;';
+
+        eval('$func = function ($n) { ' . $code . '};');
+
+        self::$custom_reduction = $func;
+
+        return $func;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/Engine.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/Engine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/Engine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1299 @@
+<?php
+
+/**
+ * Base BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * Base Engine.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Engine implements \JsonSerializable
+{
+    /* final protected */ const PRIMES = [
+        3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,  43,  47,  53,  59,
+        61,  67,  71,  73,  79,  83,  89,  97,  101, 103, 107, 109, 113, 127, 131, 137,
+        139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227,
+        229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313,
+        317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419,
+        421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509,
+        521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617,
+        619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727,
+        733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829,
+        839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947,
+        953, 967, 971, 977, 983, 991, 997,
+    ];
+
+    /**
+     * BigInteger(0)
+     *
+     * @var array<class-string<static>, static>
+     */
+    protected static $zero = [];
+
+    /**
+     * BigInteger(1)
+     *
+     * @var array<class-string<static>, static>
+     */
+    protected static $one  = [];
+
+    /**
+     * BigInteger(2)
+     *
+     * @var array<class-string<static>, static>
+     */
+    protected static $two = [];
+
+    /**
+     * Modular Exponentiation Engine
+     *
+     * @var array<class-string<static>, class-string<static>>
+     */
+    protected static $modexpEngine;
+
+    /**
+     * Engine Validity Flag
+     *
+     * @var array<class-string<static>, bool>
+     */
+    protected static $isValidEngine;
+
+    /**
+     * Holds the BigInteger's value
+     *
+     * @var \GMP|string|array|int
+     */
+    protected $value;
+
+    /**
+     * Holds the BigInteger's sign
+     *
+     * @var bool
+     */
+    protected $is_negative;
+
+    /**
+     * Precision
+     *
+     * @see static::setPrecision()
+     * @var int
+     */
+    protected $precision = -1;
+
+    /**
+     * Precision Bitmask
+     *
+     * @see static::setPrecision()
+     * @var static|false
+     */
+    protected $bitmask = false;
+
+    /**
+     * Recurring Modulo Function
+     *
+     * @var callable
+     */
+    protected $reduce;
+
+    /**
+     * Mode independent value used for serialization.
+     *
+     * @see self::__sleep()
+     * @see self::__wakeup()
+     * @var string
+     */
+    protected $hex;
+
+    /**
+     * Default constructor
+     *
+     * @param int|numeric-string $x integer Base-10 number or base-$base number if $base set.
+     * @param int $base
+     */
+    public function __construct($x = 0, $base = 10)
+    {
+        if (!array_key_exists(static::class, static::$zero)) {
+            static::$zero[static::class] = null; // Placeholder to prevent infinite loop.
+            static::$zero[static::class] = new static(0);
+            static::$one[static::class] = new static(1);
+            static::$two[static::class] = new static(2);
+        }
+
+        // '0' counts as empty() but when the base is 256 '0' is equal to ord('0') or 48
+        // '0' is the only value like this per http://php.net/empty
+        if (empty($x) && (abs($base) != 256 || $x !== '0')) {
+            return;
+        }
+
+        switch ($base) {
+            case -256:
+            case 256:
+                if ($base == -256 && (ord($x[0]) & 0x80)) {
+                    $this->value = ~$x;
+                    $this->is_negative = true;
+                } else {
+                    $this->value = $x;
+                    $this->is_negative = false;
+                }
+
+                $this->initialize($base);
+
+                if ($this->is_negative) {
+                    $temp = $this->add(new static('-1'));
+                    $this->value = $temp->value;
+                }
+                break;
+            case -16:
+            case 16:
+                if ($base > 0 && $x[0] == '-') {
+                    $this->is_negative = true;
+                    $x = substr($x, 1);
+                }
+
+                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#s', '$1', $x);
+
+                $is_negative = false;
+                if ($base < 0 && hexdec($x[0]) >= 8) {
+                    $this->is_negative = $is_negative = true;
+                    $x = Strings::bin2hex(~Strings::hex2bin($x));
+                }
+
+                $this->value = $x;
+                $this->initialize($base);
+
+                if ($is_negative) {
+                    $temp = $this->add(new static('-1'));
+                    $this->value = $temp->value;
+                }
+                break;
+            case -10:
+            case 10:
+                // (?<!^)(?:-).*: find any -'s that aren't at the beginning and then any characters that follow that
+                // (?<=^|-)0*: find any 0's that are preceded by the start of the string or by a - (ie. octals)
+                // [^-0-9].*: find any non-numeric characters and then any characters that follow that
+                $this->value = preg_replace('#(?<!^)(?:-).*|(?<=^|-)0*|[^-0-9].*#s', '', $x);
+                if (!strlen($this->value) || $this->value == '-') {
+                    $this->value = '0';
+                }
+                $this->initialize($base);
+                break;
+            case -2:
+            case 2:
+                if ($base > 0 && $x[0] == '-') {
+                    $this->is_negative = true;
+                    $x = substr($x, 1);
+                }
+
+                $x = preg_replace('#^([01]*).*#s', '$1', $x);
+
+                $temp = new static(Strings::bits2bin($x), 128 * $base); // ie. either -16 or +16
+                $this->value = $temp->value;
+                if ($temp->is_negative) {
+                    $this->is_negative = true;
+                }
+
+                break;
+            default:
+                // base not supported, so we'll let $this == 0
+        }
+    }
+
+    /**
+     * Sets engine type.
+     *
+     * Throws an exception if the type is invalid
+     *
+     * @param class-string<Engine> $engine
+     */
+    public static function setModExpEngine($engine)
+    {
+        $fqengine = '\\phpseclib3\\Math\\BigInteger\\Engines\\' . static::ENGINE_DIR . '\\' . $engine;
+        if (!class_exists($fqengine) || !method_exists($fqengine, 'isValidEngine')) {
+            throw new \InvalidArgumentException("$engine is not a valid engine");
+        }
+        if (!$fqengine::isValidEngine()) {
+            throw new BadConfigurationException("$engine is not setup correctly on this system");
+        }
+        static::$modexpEngine[static::class] = $fqengine;
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     * @return string
+     */
+    protected function toBytesHelper()
+    {
+        $comparison = $this->compare(new static());
+        if ($comparison == 0) {
+            return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+        }
+
+        $temp = $comparison < 0 ? $this->add(new static(1)) : $this;
+        $bytes = $temp->toBytes();
+
+        if (!strlen($bytes)) { // eg. if the number we're trying to convert is -1
+            $bytes = chr(0);
+        }
+
+        if (ord($bytes[0]) & 0x80) {
+            $bytes = chr(0) . $bytes;
+        }
+
+        return $comparison < 0 ? ~$bytes : $bytes;
+    }
+
+    /**
+     * Converts a BigInteger to a hex string (eg. base-16).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toHex($twos_compliment = false)
+    {
+        return Strings::bin2hex($this->toBytes($twos_compliment));
+    }
+
+    /**
+     * Converts a BigInteger to a bit string (eg. base-2).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBits($twos_compliment = false)
+    {
+        $hex = $this->toBytes($twos_compliment);
+        $bits = Strings::bin2bits($hex);
+
+        $result = $this->precision > 0 ? substr($bits, -$this->precision) : ltrim($bits, '0');
+
+        if ($twos_compliment && $this->compare(new static()) > 0 && $this->precision <= 0) {
+            return '0' . $result;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * {@internal See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=21 HAC 14.64} for more information.}
+     *
+     * @param Engine $n
+     * @return static|false
+     */
+    protected function modInverseHelper(Engine $n)
+    {
+        // $x mod -$n == $x mod $n.
+        $n = $n->abs();
+
+        if ($this->compare(static::$zero[static::class]) < 0) {
+            $temp = $this->abs();
+            $temp = $temp->modInverse($n);
+            return $this->normalize($n->subtract($temp));
+        }
+
+        extract($this->extendedGCD($n));
+        /**
+         * @var Engine $gcd
+         * @var Engine $x
+         */
+
+        if (!$gcd->equals(static::$one[static::class])) {
+            return false;
+        }
+
+        $x = $x->compare(static::$zero[static::class]) < 0 ? $x->add($n) : $x;
+
+        return $this->compare(static::$zero[static::class]) < 0 ? $this->normalize($n->subtract($x)) : $this->normalize($x);
+    }
+
+    /**
+     * Serialize
+     *
+     * Will be called, automatically, when serialize() is called on a BigInteger object.
+     *
+     * @return array
+     */
+    public function __sleep()
+    {
+        $this->hex = $this->toHex(true);
+        $vars = ['hex'];
+        if ($this->precision > 0) {
+            $vars[] = 'precision';
+        }
+        return $vars;
+    }
+
+    /**
+     * Serialize
+     *
+     * Will be called, automatically, when unserialize() is called on a BigInteger object.
+     *
+     * @return void
+     */
+    public function __wakeup()
+    {
+        $temp = new static($this->hex, -16);
+        $this->value = $temp->value;
+        $this->is_negative = $temp->is_negative;
+        if ($this->precision > 0) {
+            // recalculate $this->bitmask
+            $this->setPrecision($this->precision);
+        }
+    }
+
+    /**
+     * JSON Serialize
+     *
+     * Will be called, automatically, when json_encode() is called on a BigInteger object.
+     *
+     * @return array{hex: string, precision?: int]
+     */
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize()
+    {
+        $result = ['hex' => $this->toHex(true)];
+        if ($this->precision > 0) {
+            $result['precision'] = $this->precision;
+        }
+        return $result;
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->toString();
+    }
+
+    /**
+     *  __debugInfo() magic method
+     *
+     * Will be called, automatically, when print_r() or var_dump() are called
+     *
+     * @return array
+     */
+    public function __debugInfo()
+    {
+        $result = [
+            'value' => '0x' . $this->toHex(true),
+            'engine' => basename(static::class)
+        ];
+        return $this->precision > 0 ? $result + ['precision' => $this->precision] : $result;
+    }
+
+    /**
+     * Set Precision
+     *
+     * Some bitwise operations give different results depending on the precision being used.  Examples include left
+     * shift, not, and rotates.
+     *
+     * @param int $bits
+     */
+    public function setPrecision($bits)
+    {
+        if ($bits < 1) {
+            $this->precision = -1;
+            $this->bitmask = false;
+
+            return;
+        }
+        $this->precision = $bits;
+        $this->bitmask = static::setBitmask($bits);
+
+        $temp = $this->normalize($this);
+        $this->value = $temp->value;
+    }
+
+    /**
+     * Get Precision
+     *
+     * Returns the precision if it exists, -1 if it doesn't
+     *
+     * @return int
+     */
+    public function getPrecision()
+    {
+        return $this->precision;
+    }
+
+    /**
+     * Set Bitmask
+     * @return static
+     * @param int $bits
+     * @see self::setPrecision()
+     */
+    protected static function setBitmask($bits)
+    {
+        return new static(chr((1 << ($bits & 0x7)) - 1) . str_repeat(chr(0xFF), $bits >> 3), 256);
+    }
+
+    /**
+     * Logical Not
+     *
+     * @return Engine|string
+     */
+    public function bitwise_not()
+    {
+        // calculuate "not" without regard to $this->precision
+        // (will always result in a smaller number.  ie. ~1 isn't 1111 1110 - it's 0)
+        $temp = $this->toBytes();
+        if ($temp == '') {
+            return $this->normalize(static::$zero[static::class]);
+        }
+        $pre_msb = decbin(ord($temp[0]));
+        $temp = ~$temp;
+        $msb = decbin(ord($temp[0]));
+        if (strlen($msb) == 8) {
+            $msb = substr($msb, strpos($msb, '0'));
+        }
+        $temp[0] = chr(bindec($msb));
+
+        // see if we need to add extra leading 1's
+        $current_bits = strlen($pre_msb) + 8 * strlen($temp) - 8;
+        $new_bits = $this->precision - $current_bits;
+        if ($new_bits <= 0) {
+            return $this->normalize(new static($temp, 256));
+        }
+
+        // generate as many leading 1's as we need to.
+        $leading_ones = chr((1 << ($new_bits & 0x7)) - 1) . str_repeat(chr(0xFF), $new_bits >> 3);
+
+        self::base256_lshift($leading_ones, $current_bits);
+
+        $temp = str_pad($temp, strlen($leading_ones), chr(0), STR_PAD_LEFT);
+
+        return $this->normalize(new static($leading_ones | $temp, 256));
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts binary strings $shift bits, essentially multiplying by 2**$shift.
+     *
+     * @param string $x
+     * @param int $shift
+     * @return void
+     */
+    protected static function base256_lshift(&$x, $shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_bytes = $shift >> 3; // eg. floor($shift/8)
+        $shift &= 7; // eg. $shift % 8
+
+        $carry = 0;
+        for ($i = strlen($x) - 1; $i >= 0; --$i) {
+            $temp = ord($x[$i]) << $shift | $carry;
+            $x[$i] = chr($temp);
+            $carry = $temp >> 8;
+        }
+        $carry = ($carry != 0) ? chr($carry) : '';
+        $x = $carry . $x . str_repeat(chr(0), $num_bytes);
+    }
+
+    /**
+     * Logical Left Rotate
+     *
+     * Instead of the top x bits being dropped they're appended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return Engine
+     */
+    public function bitwise_leftRotate($shift)
+    {
+        $bits = $this->toBytes();
+
+        if ($this->precision > 0) {
+            $precision = $this->precision;
+            if (static::FAST_BITWISE) {
+                $mask = $this->bitmask->toBytes();
+            } else {
+                $mask = $this->bitmask->subtract(new static(1));
+                $mask = $mask->toBytes();
+            }
+        } else {
+            $temp = ord($bits[0]);
+            for ($i = 0; $temp >> $i; ++$i) {
+            }
+            $precision = 8 * strlen($bits) - 8 + $i;
+            $mask = chr((1 << ($precision & 0x7)) - 1) . str_repeat(chr(0xFF), $precision >> 3);
+        }
+
+        if ($shift < 0) {
+            $shift += $precision;
+        }
+        $shift %= $precision;
+
+        if (!$shift) {
+            return clone $this;
+        }
+
+        $left = $this->bitwise_leftShift($shift);
+        $left = $left->bitwise_and(new static($mask, 256));
+        $right = $this->bitwise_rightShift($precision - $shift);
+        $result = static::FAST_BITWISE ? $left->bitwise_or($right) : $left->add($right);
+        return $this->normalize($result);
+    }
+
+    /**
+     * Logical Right Rotate
+     *
+     * Instead of the bottom x bits being dropped they're prepended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return Engine
+     */
+    public function bitwise_rightRotate($shift)
+    {
+        return $this->bitwise_leftRotate(-$shift);
+    }
+
+    /**
+     * Returns the smallest and largest n-bit number
+     *
+     * @param int $bits
+     * @return array{min: static, max: static}
+     */
+    public static function minMaxBits($bits)
+    {
+        $bytes = $bits >> 3;
+        $min = str_repeat(chr(0), $bytes);
+        $max = str_repeat(chr(0xFF), $bytes);
+        $msb = $bits & 7;
+        if ($msb) {
+            $min = chr(1 << ($msb - 1)) . $min;
+            $max = chr((1 << $msb) - 1) . $max;
+        } else {
+            $min[0] = chr(0x80);
+        }
+        return [
+            'min' => new static($min, 256),
+            'max' => new static($max, 256)
+        ];
+    }
+
+    /**
+     * Return the size of a BigInteger in bits
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return strlen($this->toBits());
+    }
+
+    /**
+     * Return the size of a BigInteger in bytes
+     *
+     * @return int
+     */
+    public function getLengthInBytes()
+    {
+        return (int) ceil($this->getLength() / 8);
+    }
+
+    /**
+     * Performs some pre-processing for powMod
+     *
+     * @param Engine $e
+     * @param Engine $n
+     * @return static|false
+     */
+    protected function powModOuter(Engine $e, Engine $n)
+    {
+        $n = $this->bitmask !== false && $this->bitmask->compare($n) < 0 ? $this->bitmask : $n->abs();
+
+        if ($e->compare(new static()) < 0) {
+            $e = $e->abs();
+
+            $temp = $this->modInverse($n);
+            if ($temp === false) {
+                return false;
+            }
+
+            return $this->normalize($temp->powModInner($e, $n));
+        }
+
+        if ($this->compare($n) > 0) {
+            list(, $temp) = $this->divide($n);
+            return $temp->powModInner($e, $n);
+        }
+
+        return $this->powModInner($e, $n);
+    }
+
+    /**
+     * Sliding Window k-ary Modular Exponentiation
+     *
+     * Based on {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=27 HAC 14.85} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=210 MPM 7.7}.  In a departure from those algorithims,
+     * however, this function performs a modular reduction after every multiplication and squaring operation.
+     * As such, this function has the same preconditions that the reductions being used do.
+     *
+     * @template T of Engine
+     * @param Engine $x
+     * @param Engine $e
+     * @param Engine $n
+     * @param class-string<T> $class
+     * @return T
+     */
+    protected static function slidingWindow(Engine $x, Engine $e, Engine $n, $class)
+    {
+        static $window_ranges = [7, 25, 81, 241, 673, 1793]; // from BigInteger.java's oddModPow function
+        //static $window_ranges = [0, 7, 36, 140, 450, 1303, 3529]; // from MPM 7.3.1
+
+        $e_bits = $e->toBits();
+        $e_length = strlen($e_bits);
+
+        // calculate the appropriate window size.
+        // $window_size == 3 if $window_ranges is between 25 and 81, for example.
+        for ($i = 0, $window_size = 1; $i < count($window_ranges) && $e_length > $window_ranges[$i]; ++$window_size, ++$i) {
+        }
+
+        $n_value = $n->value;
+
+        if (method_exists(static::class, 'generateCustomReduction')) {
+            static::generateCustomReduction($n, $class);
+        }
+
+        // precompute $this^0 through $this^$window_size
+        $powers = [];
+        $powers[1] = static::prepareReduce($x->value, $n_value, $class);
+        $powers[2] = static::squareReduce($powers[1], $n_value, $class);
+
+        // we do every other number since substr($e_bits, $i, $j+1) (see below) is supposed to end
+        // in a 1.  ie. it's supposed to be odd.
+        $temp = 1 << ($window_size - 1);
+        for ($i = 1; $i < $temp; ++$i) {
+            $i2 = $i << 1;
+            $powers[$i2 + 1] = static::multiplyReduce($powers[$i2 - 1], $powers[2], $n_value, $class);
+        }
+
+        $result = new $class(1);
+        $result = static::prepareReduce($result->value, $n_value, $class);
+
+        for ($i = 0; $i < $e_length;) {
+            if (!$e_bits[$i]) {
+                $result = static::squareReduce($result, $n_value, $class);
+                ++$i;
+            } else {
+                for ($j = $window_size - 1; $j > 0; --$j) {
+                    if (!empty($e_bits[$i + $j])) {
+                        break;
+                    }
+                }
+
+                // eg. the length of substr($e_bits, $i, $j + 1)
+                for ($k = 0; $k <= $j; ++$k) {
+                    $result = static::squareReduce($result, $n_value, $class);
+                }
+
+                $result = static::multiplyReduce($result, $powers[bindec(substr($e_bits, $i, $j + 1))], $n_value, $class);
+
+                $i += $j + 1;
+            }
+        }
+
+        $temp = new $class();
+        $temp->value = static::reduce($result, $n_value, $class);
+
+        return $temp;
+    }
+
+    /**
+     * Generates a random number of a certain size
+     *
+     * Bit length is equal to $size
+     *
+     * @param int $size
+     * @return Engine
+     */
+    public static function random($size)
+    {
+        extract(static::minMaxBits($size));
+        /**
+         * @var BigInteger $min
+         * @var BigInteger $max
+         */
+        return static::randomRange($min, $max);
+    }
+
+    /**
+     * Generates a random prime number of a certain size
+     *
+     * Bit length is equal to $size
+     *
+     * @param int $size
+     * @return Engine
+     */
+    public static function randomPrime($size)
+    {
+        extract(static::minMaxBits($size));
+        /**
+         * @var static $min
+         * @var static $max
+         */
+        return static::randomRangePrime($min, $max);
+    }
+
+    /**
+     * Performs some pre-processing for randomRangePrime
+     *
+     * @param Engine $min
+     * @param Engine $max
+     * @return static|false
+     */
+    protected static function randomRangePrimeOuter(Engine $min, Engine $max)
+    {
+        $compare = $max->compare($min);
+
+        if (!$compare) {
+            return $min->isPrime() ? $min : false;
+        } elseif ($compare < 0) {
+            // if $min is bigger then $max, swap $min and $max
+            $temp = $max;
+            $max = $min;
+            $min = $temp;
+        }
+
+        $length = $max->getLength();
+        if ($length > 8196) {
+            throw new \RuntimeException("Generation of random prime numbers larger than 8196 has been disabled ($length)");
+        }
+
+        $x = static::randomRange($min, $max);
+
+        return static::randomRangePrimeInner($x, $min, $max);
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param Engine $min
+     * @param Engine $max
+     * @return Engine
+     */
+    protected static function randomRangeHelper(Engine $min, Engine $max)
+    {
+        $compare = $max->compare($min);
+
+        if (!$compare) {
+            return $min;
+        } elseif ($compare < 0) {
+            // if $min is bigger then $max, swap $min and $max
+            $temp = $max;
+            $max = $min;
+            $min = $temp;
+        }
+
+        if (!isset(static::$one[static::class])) {
+            static::$one[static::class] = new static(1);
+        }
+
+        $max = $max->subtract($min->subtract(static::$one[static::class]));
+
+        $size = strlen(ltrim($max->toBytes(), chr(0)));
+
+        /*
+            doing $random % $max doesn't work because some numbers will be more likely to occur than others.
+            eg. if $max is 140 and $random's max is 255 then that'd mean both $random = 5 and $random = 145
+            would produce 5 whereas the only value of random that could produce 139 would be 139. ie.
+            not all numbers would be equally likely. some would be more likely than others.
+
+            creating a whole new random number until you find one that is within the range doesn't work
+            because, for sufficiently small ranges, the likelihood that you'd get a number within that range
+            would be pretty small. eg. with $random's max being 255 and if your $max being 1 the probability
+            would be pretty high that $random would be greater than $max.
+
+            phpseclib works around this using the technique described here:
+
+            http://crypto.stackexchange.com/questions/5708/creating-a-small-number-from-a-cryptographically-secure-random-string
+        */
+        $random_max = new static(chr(1) . str_repeat("\0", $size), 256);
+        $random = new static(Random::string($size), 256);
+
+        list($max_multiple) = $random_max->divide($max);
+        $max_multiple = $max_multiple->multiply($max);
+
+        while ($random->compare($max_multiple) >= 0) {
+            $random = $random->subtract($max_multiple);
+            $random_max = $random_max->subtract($max_multiple);
+            $random = $random->bitwise_leftShift(8);
+            $random = $random->add(new static(Random::string(1), 256));
+            $random_max = $random_max->bitwise_leftShift(8);
+            list($max_multiple) = $random_max->divide($max);
+            $max_multiple = $max_multiple->multiply($max);
+        }
+        list(, $random) = $random->divide($max);
+
+        return $random->add($min);
+    }
+
+    /**
+     * Performs some post-processing for randomRangePrime
+     *
+     * @param Engine $x
+     * @param Engine $min
+     * @param Engine $max
+     * @return static|false
+     */
+    protected static function randomRangePrimeInner(Engine $x, Engine $min, Engine $max)
+    {
+        if (!isset(static::$two[static::class])) {
+            static::$two[static::class] = new static('2');
+        }
+
+        $x->make_odd();
+        if ($x->compare($max) > 0) {
+            // if $x > $max then $max is even and if $min == $max then no prime number exists between the specified range
+            if ($min->equals($max)) {
+                return false;
+            }
+            $x = clone $min;
+            $x->make_odd();
+        }
+
+        $initial_x = clone $x;
+
+        while (true) {
+            if ($x->isPrime()) {
+                return $x;
+            }
+
+            $x = $x->add(static::$two[static::class]);
+
+            if ($x->compare($max) > 0) {
+                $x = clone $min;
+                if ($x->equals(static::$two[static::class])) {
+                    return $x;
+                }
+                $x->make_odd();
+            }
+
+            if ($x->equals($initial_x)) {
+                return false;
+            }
+        }
+    }
+
+    /**
+     * Sets the $t parameter for primality testing
+     *
+     * @return int
+     */
+    protected function setupIsPrime()
+    {
+        $length = $this->getLengthInBytes();
+
+        // see HAC 4.49 "Note (controlling the error probability)"
+        // @codingStandardsIgnoreStart
+             if ($length >= 163) { $t =  2; } // floor(1300 / 8)
+        else if ($length >= 106) { $t =  3; } // floor( 850 / 8)
+        else if ($length >= 81 ) { $t =  4; } // floor( 650 / 8)
+        else if ($length >= 68 ) { $t =  5; } // floor( 550 / 8)
+        else if ($length >= 56 ) { $t =  6; } // floor( 450 / 8)
+        else if ($length >= 50 ) { $t =  7; } // floor( 400 / 8)
+        else if ($length >= 43 ) { $t =  8; } // floor( 350 / 8)
+        else if ($length >= 37 ) { $t =  9; } // floor( 300 / 8)
+        else if ($length >= 31 ) { $t = 12; } // floor( 250 / 8)
+        else if ($length >= 25 ) { $t = 15; } // floor( 200 / 8)
+        else if ($length >= 18 ) { $t = 18; } // floor( 150 / 8)
+        else                     { $t = 27; }
+        // @codingStandardsIgnoreEnd
+
+        return $t;
+    }
+
+    /**
+     * Tests Primality
+     *
+     * Uses the {@link http://en.wikipedia.org/wiki/Miller%E2%80%93Rabin_primality_test Miller-Rabin primality test}.
+     * See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap4.pdf#page=8 HAC 4.24} for more info.
+     *
+     * @param int $t
+     * @return bool
+     */
+    protected function testPrimality($t)
+    {
+        if (!$this->testSmallPrimes()) {
+            return false;
+        }
+
+        $n   = clone $this;
+        $n_1 = $n->subtract(static::$one[static::class]);
+        $n_2 = $n->subtract(static::$two[static::class]);
+
+        $r = clone $n_1;
+        $s = static::scan1divide($r);
+
+        for ($i = 0; $i < $t; ++$i) {
+            $a = static::randomRange(static::$two[static::class], $n_2);
+            $y = $a->modPow($r, $n);
+
+            if (!$y->equals(static::$one[static::class]) && !$y->equals($n_1)) {
+                for ($j = 1; $j < $s && !$y->equals($n_1); ++$j) {
+                    $y = $y->modPow(static::$two[static::class], $n);
+                    if ($y->equals(static::$one[static::class])) {
+                        return false;
+                    }
+                }
+
+                if (!$y->equals($n_1)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks a numer to see if it's prime
+     *
+     * Assuming the $t parameter is not set, this function has an error rate of 2**-80.  The main motivation for the
+     * $t parameter is distributability.  BigInteger::randomPrime() can be distributed across multiple pageloads
+     * on a website instead of just one.
+     *
+     * @param int|bool $t
+     * @return bool
+     */
+    public function isPrime($t = false)
+    {
+        // OpenSSL limits RSA keys to 16384 bits. The length of an RSA key is equal to the length of the modulo, which is
+        // produced by multiplying the primes p and q by one another. The largest number two 8196 bit primes can produce is
+        // a 16384 bit number so, basically, 8196 bit primes are the largest OpenSSL will generate and if that's the largest
+        // that it'll generate it also stands to reason that that's the largest you'll be able to test primality on
+        $length = $this->getLength();
+        if ($length > 8196) {
+            throw new \RuntimeException("Primality testing is not supported for numbers larger than 8196 bits ($length)");
+        }
+
+        if (!$t) {
+            $t = $this->setupIsPrime();
+        }
+        return $this->testPrimality($t);
+    }
+
+    /**
+     * Performs a few preliminary checks on root
+     *
+     * @param int $n
+     * @return Engine
+     */
+    protected function rootHelper($n)
+    {
+        if ($n < 1) {
+            return clone static::$zero[static::class];
+        } // we want positive exponents
+        if ($this->compare(static::$one[static::class]) < 0) {
+            return clone static::$zero[static::class];
+        } // we want positive numbers
+        if ($this->compare(static::$two[static::class]) < 0) {
+            return clone static::$one[static::class];
+        } // n-th root of 1 or 2 is 1
+
+        return $this->rootInner($n);
+    }
+
+    /**
+     * Calculates the nth root of a biginteger.
+     *
+     * Returns the nth root of a positive biginteger, where n defaults to 2
+     *
+     * {@internal This function is based off of {@link http://mathforum.org/library/drmath/view/52605.html this page} and {@link http://stackoverflow.com/questions/11242920/calculating-nth-root-with-bcmath-in-php this stackoverflow question}.}
+     *
+     * @param int $n
+     * @return Engine
+     */
+    protected function rootInner($n)
+    {
+        $n = new static($n);
+
+        // g is our guess number
+        $g = static::$two[static::class];
+        // while (g^n < num) g=g*2
+        while ($g->pow($n)->compare($this) < 0) {
+            $g = $g->multiply(static::$two[static::class]);
+        }
+        // if (g^n==num) num is a power of 2, we're lucky, end of job
+        // == 0 bccomp(bcpow($g, $n), $n->value)==0
+        if ($g->pow($n)->equals($this) > 0) {
+            $root = $g;
+            return $this->normalize($root);
+        }
+
+        // if we're here num wasn't a power of 2 :(
+        $og = $g; // og means original guess and here is our upper bound
+        $g = $g->divide(static::$two[static::class])[0]; // g is set to be our lower bound
+        $step = $og->subtract($g)->divide(static::$two[static::class])[0]; // step is the half of upper bound - lower bound
+        $g = $g->add($step); // we start at lower bound + step , basically in the middle of our interval
+
+        // while step>1
+
+        while ($step->compare(static::$one[static::class]) == 1) {
+            $guess = $g->pow($n);
+            $step = $step->divide(static::$two[static::class])[0];
+            $comp = $guess->compare($this); // compare our guess with real number
+            switch ($comp) {
+                case -1: // if guess is lower we add the new step
+                    $g = $g->add($step);
+                    break;
+                case 1: // if guess is higher we sub the new step
+                    $g = $g->subtract($step);
+                    break;
+                case 0: // if guess is exactly the num we're done, we return the value
+                    $root = $g;
+                    break 2;
+            }
+        }
+
+        if ($comp == 1) {
+            $g = $g->subtract($step);
+        }
+
+        // whatever happened, g is the closest guess we can make so return it
+        $root = $g;
+
+        return $this->normalize($root);
+    }
+
+    /**
+     * Calculates the nth root of a biginteger.
+     *
+     * @param int $n
+     * @return Engine
+     */
+    public function root($n = 2)
+    {
+        return $this->rootHelper($n);
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param array $nums
+     * @return Engine
+     */
+    protected static function minHelper(array $nums)
+    {
+        if (count($nums) == 1) {
+            return $nums[0];
+        }
+        $min = $nums[0];
+        for ($i = 1; $i < count($nums); $i++) {
+            $min = $min->compare($nums[$i]) > 0 ? $nums[$i] : $min;
+        }
+        return $min;
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param array $nums
+     * @return Engine
+     */
+    protected static function maxHelper(array $nums)
+    {
+        if (count($nums) == 1) {
+            return $nums[0];
+        }
+        $max = $nums[0];
+        for ($i = 1; $i < count($nums); $i++) {
+            $max = $max->compare($nums[$i]) < 0 ? $nums[$i] : $max;
+        }
+        return $max;
+    }
+
+    /**
+     * Create Recurring Modulo Function
+     *
+     * Sometimes it may be desirable to do repeated modulos with the same number outside of
+     * modular exponentiation
+     *
+     * @return callable
+     */
+    public function createRecurringModuloFunction()
+    {
+        $class = static::class;
+
+        $fqengine = !method_exists(static::$modexpEngine[static::class], 'reduce') ?
+            '\\phpseclib3\\Math\\BigInteger\\Engines\\' . static::ENGINE_DIR . '\\DefaultEngine' :
+            static::$modexpEngine[static::class];
+        if (method_exists($fqengine, 'generateCustomReduction')) {
+            $func = $fqengine::generateCustomReduction($this, static::class);
+            return eval('return function(' . static::class . ' $x) use ($func, $class) {
+                $r = new $class();
+                $r->value = $func($x->value);
+                return $r;
+            };');
+        }
+        $n = $this->value;
+        return eval('return function(' . static::class . ' $x) use ($n, $fqengine, $class) {
+            $r = new $class();
+            $r->value = $fqengine::reduce($x->value, $n, $class);
+            return $r;
+        };');
+    }
+
+    /**
+     * Calculates the greatest common divisor and Bezout's identity.
+     *
+     * @param Engine $n
+     * @return array{gcd: Engine, x: Engine, y: Engine}
+     */
+    protected function extendedGCDHelper(Engine $n)
+    {
+        $u = clone $this;
+        $v = clone $n;
+
+        $one = new static(1);
+        $zero = new static();
+
+        $a = clone $one;
+        $b = clone $zero;
+        $c = clone $zero;
+        $d = clone $one;
+
+        while (!$v->equals($zero)) {
+            list($q) = $u->divide($v);
+
+            $temp = $u;
+            $u = $v;
+            $v = $temp->subtract($v->multiply($q));
+
+            $temp = $a;
+            $a = $c;
+            $c = $temp->subtract($a->multiply($q));
+
+            $temp = $b;
+            $b = $d;
+            $d = $temp->subtract($b->multiply($q));
+        }
+
+        return [
+            'gcd' => $u,
+            'x' => $a,
+            'y' => $b
+        ];
+    }
+
+    /**
+     * Bitwise Split
+     *
+     * Splits BigInteger's into chunks of $split bits
+     *
+     * @param int $split
+     * @return Engine[]
+     */
+    public function bitwise_split($split)
+    {
+        if ($split < 1) {
+            throw new \RuntimeException('Offset must be greater than 1');
+        }
+
+        $mask = static::$one[static::class]->bitwise_leftShift($split)->subtract(static::$one[static::class]);
+
+        $num = clone $this;
+
+        $vals = [];
+        while (!$num->equals(static::$zero[static::class])) {
+            $vals[] = $num->bitwise_and($mask);
+            $num = $num->bitwise_rightShift($split);
+        }
+
+        return array_reverse($vals);
+    }
+
+    /**
+     * Logical And
+     *
+     * @param Engine $x
+     * @return Engine
+     */
+    protected function bitwiseAndHelper(Engine $x)
+    {
+        $left = $this->toBytes(true);
+        $right = $x->toBytes(true);
+
+        $length = max(strlen($left), strlen($right));
+
+        $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+        $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+
+        return $this->normalize(new static($left & $right, -256));
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param Engine $x
+     * @return Engine
+     */
+    protected function bitwiseOrHelper(Engine $x)
+    {
+        $left = $this->toBytes(true);
+        $right = $x->toBytes(true);
+
+        $length = max(strlen($left), strlen($right));
+
+        $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+        $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+
+        return $this->normalize(new static($left | $right, -256));
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param Engine $x
+     * @return Engine
+     */
+    protected function bitwiseXorHelper(Engine $x)
+    {
+        $left = $this->toBytes(true);
+        $right = $x->toBytes(true);
+
+        $length = max(strlen($left), strlen($right));
+
+
+        $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+        $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+        return $this->normalize(new static($left ^ $right, -256));
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,694 @@
+<?php
+
+/**
+ * GMP BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+use phpseclib3\Exception\BadConfigurationException;
+
+/**
+ * GMP Engine.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class GMP extends Engine
+{
+    /**
+     * Can Bitwise operations be done fast?
+     *
+     * @see parent::bitwise_leftRotate()
+     * @see parent::bitwise_rightRotate()
+     */
+    const FAST_BITWISE = true;
+
+    /**
+     * Engine Directory
+     *
+     * @see parent::setModExpEngine
+     */
+    const ENGINE_DIR = 'GMP';
+
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     * @see parent::__construct()
+     */
+    public static function isValidEngine()
+    {
+        return extension_loaded('gmp');
+    }
+
+    /**
+     * Default constructor
+     *
+     * @param mixed $x integer Base-10 number or base-$base number if $base set.
+     * @param int $base
+     * @see parent::__construct()
+     */
+    public function __construct($x = 0, $base = 10)
+    {
+        if (!isset(static::$isValidEngine[static::class])) {
+            static::$isValidEngine[static::class] = self::isValidEngine();
+        }
+        if (!static::$isValidEngine[static::class]) {
+            throw new BadConfigurationException('GMP is not setup correctly on this system');
+        }
+
+        if ($x instanceof \GMP) {
+            $this->value = $x;
+            return;
+        }
+
+        $this->value = gmp_init(0);
+
+        parent::__construct($x, $base);
+    }
+
+    /**
+     * Initialize a GMP BigInteger Engine instance
+     *
+     * @param int $base
+     * @see parent::__construct()
+     */
+    protected function initialize($base)
+    {
+        switch (abs($base)) {
+            case 256:
+                $this->value = gmp_import($this->value);
+                if ($this->is_negative) {
+                    $this->value = -$this->value;
+                }
+                break;
+            case 16:
+                $temp = $this->is_negative ? '-0x' . $this->value : '0x' . $this->value;
+                $this->value = gmp_init($temp);
+                break;
+            case 10:
+                $this->value = gmp_init(isset($this->value) ? $this->value : '0');
+        }
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * @return string
+     */
+    public function toString()
+    {
+        return (string)$this->value;
+    }
+
+    /**
+     * Converts a BigInteger to a bit string (eg. base-2).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBits($twos_compliment = false)
+    {
+        $hex = $this->toHex($twos_compliment);
+
+        $bits = gmp_strval(gmp_init($hex, 16), 2);
+
+        if ($this->precision > 0) {
+            $bits = substr($bits, -$this->precision);
+        }
+
+        if ($twos_compliment && $this->compare(new static()) > 0 && $this->precision <= 0) {
+            return '0' . $bits;
+        }
+
+        return $bits;
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBytes($twos_compliment = false)
+    {
+        if ($twos_compliment) {
+            return $this->toBytesHelper();
+        }
+
+        if (gmp_cmp($this->value, gmp_init(0)) == 0) {
+            return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+        }
+
+        $temp = gmp_export($this->value);
+
+        return $this->precision > 0 ?
+            substr(str_pad($temp, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
+            ltrim($temp, chr(0));
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * @param GMP $y
+     * @return GMP
+     */
+    public function add(GMP $y)
+    {
+        $temp = new self();
+        $temp->value = $this->value + $y->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * @param GMP $y
+     * @return GMP
+     */
+    public function subtract(GMP $y)
+    {
+        $temp = new self();
+        $temp->value = $this->value - $y->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Multiplies two BigIntegers.
+     *
+     * @param GMP $x
+     * @return GMP
+     */
+    public function multiply(GMP $x)
+    {
+        $temp = new self();
+        $temp->value = $this->value * $x->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * @param GMP $y
+     * @return array{GMP, GMP}
+     */
+    public function divide(GMP $y)
+    {
+        $quotient = new self();
+        $remainder = new self();
+
+        list($quotient->value, $remainder->value) = gmp_div_qr($this->value, $y->value);
+
+        if (gmp_sign($remainder->value) < 0) {
+            $remainder->value = $remainder->value + gmp_abs($y->value);
+        }
+
+        return [$this->normalize($quotient), $this->normalize($remainder)];
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this
+     * is demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
+     *
+     * @param GMP $y
+     * @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @see self::equals()
+     */
+    public function compare(GMP $y)
+    {
+        $r = gmp_cmp($this->value, $y->value);
+        if ($r < -1) {
+            $r = -1;
+        }
+        if ($r > 1) {
+            $r = 1;
+        }
+        return $r;
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use BigInteger::compare()
+     *
+     * @param GMP $x
+     * @return bool
+     */
+    public function equals(GMP $x)
+    {
+        return $this->value == $x->value;
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * @param GMP $n
+     * @return false|GMP
+     */
+    public function modInverse(GMP $n)
+    {
+        $temp = new self();
+        $temp->value = gmp_invert($this->value, $n->value);
+
+        return $temp->value === false ? false : $this->normalize($temp);
+    }
+
+    /**
+     * Calculates the greatest common divisor and Bezout's identity.
+     *
+     * Say you have 693 and 609.  The GCD is 21.  Bezout's identity states that there exist integers x and y such that
+     * 693*x + 609*y == 21.  In point of fact, there are actually an infinite number of x and y combinations and which
+     * combination is returned is dependent upon which mode is in use.  See
+     * {@link http://en.wikipedia.org/wiki/B%C3%A9zout%27s_identity Bezout's identity - Wikipedia} for more information.
+     *
+     * @param GMP $n
+     * @return GMP[]
+     */
+    public function extendedGCD(GMP $n)
+    {
+        extract(gmp_gcdext($this->value, $n->value));
+
+        return [
+            'gcd' => $this->normalize(new self($g)),
+            'x' => $this->normalize(new self($s)),
+            'y' => $this->normalize(new self($t))
+        ];
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * @param GMP $n
+     * @return GMP
+     */
+    public function gcd(GMP $n)
+    {
+        $r = gmp_gcd($this->value, $n->value);
+        return $this->normalize(new self($r));
+    }
+
+    /**
+     * Absolute value.
+     *
+     * @return GMP
+     */
+    public function abs()
+    {
+        $temp = new self();
+        $temp->value = gmp_abs($this->value);
+
+        return $temp;
+    }
+
+    /**
+     * Logical And
+     *
+     * @param GMP $x
+     * @return GMP
+     */
+    public function bitwise_and(GMP $x)
+    {
+        $temp = new self();
+        $temp->value = $this->value & $x->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param GMP $x
+     * @return GMP
+     */
+    public function bitwise_or(GMP $x)
+    {
+        $temp = new self();
+        $temp->value = $this->value | $x->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param GMP $x
+     * @return GMP
+     */
+    public function bitwise_xor(GMP $x)
+    {
+        $temp = new self();
+        $temp->value = $this->value ^ $x->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
+     *
+     * @param int $shift
+     * @return GMP
+     */
+    public function bitwise_rightShift($shift)
+    {
+        // 0xFFFFFFFF >> 2 == -1 (on 32-bit systems)
+        // gmp_init('0xFFFFFFFF') >> 2 == gmp_init('0x3FFFFFFF')
+
+        $temp = new self();
+        $temp->value = $this->value >> $shift;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
+     *
+     * @param int $shift
+     * @return GMP
+     */
+    public function bitwise_leftShift($shift)
+    {
+        $temp = new self();
+        $temp->value = $this->value << $shift;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param GMP $e
+     * @param GMP $n
+     * @return GMP
+     */
+    public function modPow(GMP $e, GMP $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Alias for modPow().
+     *
+     * @param GMP $e
+     * @param GMP $n
+     * @return GMP
+     */
+    public function powMod(GMP $e, GMP $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param GMP $e
+     * @param GMP $n
+     * @return GMP
+     */
+    protected function powModInner(GMP $e, GMP $n)
+    {
+        $class = static::$modexpEngine[static::class];
+        return $class::powModHelper($this, $e, $n);
+    }
+
+    /**
+     * Normalize
+     *
+     * Removes leading zeros and truncates (if necessary) to maintain the appropriate precision
+     *
+     * @param GMP $result
+     * @return GMP
+     */
+    protected function normalize(GMP $result)
+    {
+        $result->precision = $this->precision;
+        $result->bitmask = $this->bitmask;
+
+        if ($result->bitmask !== false) {
+            $flip = $result->value < 0;
+            if ($flip) {
+                $result->value = -$result->value;
+            }
+            $result->value = $result->value & $result->bitmask->value;
+            if ($flip) {
+                $result->value = -$result->value;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Performs some post-processing for randomRangePrime
+     *
+     * @param Engine $x
+     * @param Engine $min
+     * @param Engine $max
+     * @return GMP
+     */
+    protected static function randomRangePrimeInner(Engine $x, Engine $min, Engine $max)
+    {
+        $p = gmp_nextprime($x->value);
+
+        if ($p <= $max->value) {
+            return new self($p);
+        }
+
+        if ($min->value != $x->value) {
+            $x = new self($x->value - 1);
+        }
+
+        return self::randomRangePrime($min, $x);
+    }
+
+    /**
+     * Generate a random prime number between a range
+     *
+     * If there's not a prime within the given range, false will be returned.
+     *
+     * @param GMP $min
+     * @param GMP $max
+     * @return false|GMP
+     */
+    public static function randomRangePrime(GMP $min, GMP $max)
+    {
+        return self::randomRangePrimeOuter($min, $max);
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param GMP $min
+     * @param GMP $max
+     * @return GMP
+     */
+    public static function randomRange(GMP $min, GMP $max)
+    {
+        return self::randomRangeHelper($min, $max);
+    }
+
+    /**
+     * Make the current number odd
+     *
+     * If the current number is odd it'll be unchanged.  If it's even, one will be added to it.
+     *
+     * @see self::randomPrime()
+     */
+    protected function make_odd()
+    {
+        gmp_setbit($this->value, 0);
+    }
+
+    /**
+     * Tests Primality
+     *
+     * @param int $t
+     * @return bool
+     */
+    protected function testPrimality($t)
+    {
+        return gmp_prob_prime($this->value, $t) != 0;
+    }
+
+    /**
+     * Calculates the nth root of a biginteger.
+     *
+     * Returns the nth root of a positive biginteger, where n defaults to 2
+     *
+     * @param int $n
+     * @return GMP
+     */
+    protected function rootInner($n)
+    {
+        $root = new self();
+        $root->value = gmp_root($this->value, $n);
+        return $this->normalize($root);
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param GMP $n
+     * @return GMP
+     */
+    public function pow(GMP $n)
+    {
+        $temp = new self();
+        $temp->value = $this->value ** $n->value;
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param GMP ...$nums
+     * @return GMP
+     */
+    public static function min(GMP ...$nums)
+    {
+        return self::minHelper($nums);
+    }
+
+    /**
+     * Return the maximum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param GMP ...$nums
+     * @return GMP
+     */
+    public static function max(GMP ...$nums)
+    {
+        return self::maxHelper($nums);
+    }
+
+    /**
+     * Tests BigInteger to see if it is between two integers, inclusive
+     *
+     * @param GMP $min
+     * @param GMP $max
+     * @return bool
+     */
+    public function between(GMP $min, GMP $max)
+    {
+        return $this->compare($min) >= 0 && $this->compare($max) <= 0;
+    }
+
+    /**
+     * Create Recurring Modulo Function
+     *
+     * Sometimes it may be desirable to do repeated modulos with the same number outside of
+     * modular exponentiation
+     *
+     * @return callable
+     */
+    public function createRecurringModuloFunction()
+    {
+        $temp = $this->value;
+        return function (GMP $x) use ($temp) {
+            return new GMP($x->value % $temp);
+        };
+    }
+
+    /**
+     * Scan for 1 and right shift by that amount
+     *
+     * ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
+     *
+     * @param GMP $r
+     * @return int
+     */
+    public static function scan1divide(GMP $r)
+    {
+        $s = gmp_scan1($r->value, 0);
+        $r->value >>= $s;
+        return $s;
+    }
+
+    /**
+     * Is Odd?
+     *
+     * @return bool
+     */
+    public function isOdd()
+    {
+        return gmp_testbit($this->value, 0);
+    }
+
+    /**
+     * Tests if a bit is set
+     *
+     * @return bool
+     */
+    public function testBit($x)
+    {
+        return gmp_testbit($this->value, $x);
+    }
+
+    /**
+     * Is Negative?
+     *
+     * @return bool
+     */
+    public function isNegative()
+    {
+        return gmp_sign($this->value) == -1;
+    }
+
+    /**
+     * Negate
+     *
+     * Given $k, returns -$k
+     *
+     * @return GMP
+     */
+    public function negate()
+    {
+        $temp = clone $this;
+        $temp->value = -$this->value;
+
+        return $temp;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP/DefaultEngine.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/GMP/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * GMP Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\GMP;
+
+use phpseclib3\Math\BigInteger\Engines\GMP;
+
+/**
+ * GMP Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DefaultEngine extends GMP
+{
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param GMP $x
+     * @param GMP $e
+     * @param GMP $n
+     * @return GMP
+     */
+    protected static function powModHelper(GMP $x, GMP $e, GMP $n)
+    {
+        $temp = new GMP();
+        $temp->value = gmp_powm($x->value, $e->value, $n->value);
+
+        return $x->normalize($temp);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/OpenSSL.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+use phpseclib3\Crypt\RSA\Formats\Keys\PKCS8;
+use phpseclib3\Math\BigInteger;
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSL
+{
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return extension_loaded('openssl') && static::class != __CLASS__;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param Engine $x
+     * @param Engine $e
+     * @param Engine $n
+     * @return Engine
+     */
+    public static function powModHelper(Engine $x, Engine $e, Engine $n)
+    {
+        if ($n->getLengthInBytes() < 31 || $n->getLengthInBytes() > 16384) {
+            throw new \OutOfRangeException('Only modulo between 31 and 16384 bits are accepted');
+        }
+
+        $key = PKCS8::savePublicKey(
+            new BigInteger($n),
+            new BigInteger($e)
+        );
+
+        $plaintext = str_pad($x->toBytes(), $n->getLengthInBytes(), "\0", STR_PAD_LEFT);
+
+        // this is easily prone to failure. if the modulo is a multiple of 2 or 3 or whatever it
+        // won't work and you'll get a "failure: error:0906D06C:PEM routines:PEM_read_bio:no start line"
+        // error. i suppose, for even numbers, we could do what PHP\Montgomery.php does, but then what
+        // about odd numbers divisible by 3, by 5, etc?
+        if (!openssl_public_encrypt($plaintext, $result, $key, OPENSSL_NO_PADDING)) {
+            throw new \UnexpectedValueException(openssl_error_string());
+        }
+
+        $class = get_class($x);
+        return new $class($result, 256);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,1357 @@
+<?php
+
+/**
+ * Pure-PHP BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\BadConfigurationException;
+
+/**
+ * Pure-PHP Engine.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PHP extends Engine
+{
+    /**#@+
+     * Array constants
+     *
+     * Rather than create a thousands and thousands of new BigInteger objects in repeated function calls to add() and
+     * multiply() or whatever, we'll just work directly on arrays, taking them in as parameters and returning them.
+     *
+     */
+    /**
+     * $result[self::VALUE] contains the value.
+     */
+    const VALUE = 0;
+    /**
+     * $result[self::SIGN] contains the sign.
+     */
+    const SIGN = 1;
+    /**#@-*/
+
+    /**
+     * Karatsuba Cutoff
+     *
+     * At what point do we switch between Karatsuba multiplication and schoolbook long multiplication?
+     *
+     */
+    const KARATSUBA_CUTOFF = 25;
+
+    /**
+     * Can Bitwise operations be done fast?
+     *
+     * @see parent::bitwise_leftRotate()
+     * @see parent::bitwise_rightRotate()
+     */
+    const FAST_BITWISE = true;
+
+    /**
+     * Engine Directory
+     *
+     * @see parent::setModExpEngine
+     */
+    const ENGINE_DIR = 'PHP';
+
+    /**
+     * Default constructor
+     *
+     * @param mixed $x integer Base-10 number or base-$base number if $base set.
+     * @param int $base
+     * @return PHP
+     * @see parent::__construct()
+     */
+    public function __construct($x = 0, $base = 10)
+    {
+        if (!isset(static::$isValidEngine[static::class])) {
+            static::$isValidEngine[static::class] = static::isValidEngine();
+        }
+        if (!static::$isValidEngine[static::class]) {
+            throw new BadConfigurationException(static::class . ' is not setup correctly on this system');
+        }
+
+        $this->value = [];
+        parent::__construct($x, $base);
+    }
+
+    /**
+     * Initialize a PHP BigInteger Engine instance
+     *
+     * @param int $base
+     * @see parent::__construct()
+     */
+    protected function initialize($base)
+    {
+        switch (abs($base)) {
+            case 16:
+                $x = (strlen($this->value) & 1) ? '0' . $this->value : $this->value;
+                $temp = new static(Strings::hex2bin($x), 256);
+                $this->value = $temp->value;
+                break;
+            case 10:
+                $temp = new static();
+
+                $multiplier = new static();
+                $multiplier->value = [static::MAX10];
+
+                $x = $this->value;
+
+                if ($x[0] == '-') {
+                    $this->is_negative = true;
+                    $x = substr($x, 1);
+                }
+
+                $x = str_pad(
+                    $x,
+                    strlen($x) + ((static::MAX10LEN - 1) * strlen($x)) % static::MAX10LEN,
+                    0,
+                    STR_PAD_LEFT
+                );
+                while (strlen($x)) {
+                    $temp = $temp->multiply($multiplier);
+                    $temp = $temp->add(new static($this->int2bytes(substr($x, 0, static::MAX10LEN)), 256));
+                    $x = substr($x, static::MAX10LEN);
+                }
+
+                $this->value = $temp->value;
+        }
+    }
+
+    /**
+     * Pads strings so that unpack may be used on them
+     *
+     * @param string $str
+     * @return string
+     */
+    protected function pad($str)
+    {
+        $length = strlen($str);
+
+        $pad = 4 - (strlen($str) % 4);
+
+        return str_pad($str, $length + $pad, "\0", STR_PAD_LEFT);
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * @return string
+     */
+    public function toString()
+    {
+        if (!count($this->value)) {
+            return '0';
+        }
+
+        $temp = clone $this;
+        $temp->bitmask = false;
+        $temp->is_negative = false;
+
+        $divisor = new static();
+        $divisor->value = [static::MAX10];
+        $result = '';
+        while (count($temp->value)) {
+            list($temp, $mod) = $temp->divide($divisor);
+            $result = str_pad(
+                isset($mod->value[0]) ? $mod->value[0] : '',
+                static::MAX10LEN,
+                '0',
+                STR_PAD_LEFT
+            ) . $result;
+        }
+        $result = ltrim($result, '0');
+        if (empty($result)) {
+            $result = '0';
+        }
+
+        if ($this->is_negative) {
+            $result = '-' . $result;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * @param bool $twos_compliment
+     * @return string
+     */
+    public function toBytes($twos_compliment = false)
+    {
+        if ($twos_compliment) {
+            return $this->toBytesHelper();
+        }
+
+        if (!count($this->value)) {
+            return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+        }
+
+        $result = $this->bitwise_small_split(8);
+        $result = implode('', array_map('chr', $result));
+
+        return $this->precision > 0 ?
+            str_pad(
+                substr($result, -(($this->precision + 7) >> 3)),
+                ($this->precision + 7) >> 3,
+                chr(0),
+                STR_PAD_LEFT
+            ) :
+            $result;
+    }
+
+    /**
+     * Performs addition.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     */
+    protected static function addHelper(array $x_value, $x_negative, array $y_value, $y_negative)
+    {
+        $x_size = count($x_value);
+        $y_size = count($y_value);
+
+        if ($x_size == 0) {
+            return [
+                self::VALUE => $y_value,
+                self::SIGN => $y_negative
+            ];
+        } elseif ($y_size == 0) {
+            return [
+                self::VALUE => $x_value,
+                self::SIGN => $x_negative
+            ];
+        }
+
+        // subtract, if appropriate
+        if ($x_negative != $y_negative) {
+            if ($x_value == $y_value) {
+                return [
+                    self::VALUE => [],
+                    self::SIGN => false
+                ];
+            }
+
+            $temp = self::subtractHelper($x_value, false, $y_value, false);
+            $temp[self::SIGN] = self::compareHelper($x_value, false, $y_value, false) > 0 ?
+                $x_negative : $y_negative;
+
+            return $temp;
+        }
+
+        if ($x_size < $y_size) {
+            $size = $x_size;
+            $value = $y_value;
+        } else {
+            $size = $y_size;
+            $value = $x_value;
+        }
+
+        $value[count($value)] = 0; // just in case the carry adds an extra digit
+
+        $carry = 0;
+        for ($i = 0, $j = 1; $j < $size; $i += 2, $j += 2) {
+            //$sum = $x_value[$j] * static::BASE_FULL + $x_value[$i] + $y_value[$j] * static::BASE_FULL + $y_value[$i] + $carry;
+            $sum = ($x_value[$j] + $y_value[$j]) * static::BASE_FULL + $x_value[$i] + $y_value[$i] + $carry;
+            $carry = $sum >= static::MAX_DIGIT2; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
+            $sum = $carry ? $sum - static::MAX_DIGIT2 : $sum;
+
+            $temp = static::BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);
+
+            $value[$i] = (int)($sum - static::BASE_FULL * $temp); // eg. a faster alternative to fmod($sum, 0x4000000)
+            $value[$j] = $temp;
+        }
+
+        if ($j == $size) { // ie. if $y_size is odd
+            $sum = $x_value[$i] + $y_value[$i] + $carry;
+            $carry = $sum >= static::BASE_FULL;
+            $value[$i] = $carry ? $sum - static::BASE_FULL : $sum;
+            ++$i; // ie. let $i = $j since we've just done $value[$i]
+        }
+
+        if ($carry) {
+            for (; $value[$i] == static::MAX_DIGIT; ++$i) {
+                $value[$i] = 0;
+            }
+            ++$value[$i];
+        }
+
+        return [
+            self::VALUE => self::trim($value),
+            self::SIGN => $x_negative
+        ];
+    }
+
+    /**
+     * Performs subtraction.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     */
+    public static function subtractHelper(array $x_value, $x_negative, array $y_value, $y_negative)
+    {
+        $x_size = count($x_value);
+        $y_size = count($y_value);
+
+        if ($x_size == 0) {
+            return [
+                self::VALUE => $y_value,
+                self::SIGN => !$y_negative
+            ];
+        } elseif ($y_size == 0) {
+            return [
+                self::VALUE => $x_value,
+                self::SIGN => $x_negative
+            ];
+        }
+
+        // add, if appropriate (ie. -$x - +$y or +$x - -$y)
+        if ($x_negative != $y_negative) {
+            $temp = self::addHelper($x_value, false, $y_value, false);
+            $temp[self::SIGN] = $x_negative;
+
+            return $temp;
+        }
+
+        $diff = self::compareHelper($x_value, $x_negative, $y_value, $y_negative);
+
+        if (!$diff) {
+            return [
+                self::VALUE => [],
+                self::SIGN => false
+            ];
+        }
+
+        // switch $x and $y around, if appropriate.
+        if ((!$x_negative && $diff < 0) || ($x_negative && $diff > 0)) {
+            $temp = $x_value;
+            $x_value = $y_value;
+            $y_value = $temp;
+
+            $x_negative = !$x_negative;
+
+            $x_size = count($x_value);
+            $y_size = count($y_value);
+        }
+
+        // at this point, $x_value should be at least as big as - if not bigger than - $y_value
+
+        $carry = 0;
+        for ($i = 0, $j = 1; $j < $y_size; $i += 2, $j += 2) {
+            $sum = ($x_value[$j] - $y_value[$j]) * static::BASE_FULL + $x_value[$i] - $y_value[$i] - $carry;
+
+            $carry = $sum < 0; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
+            $sum = $carry ? $sum + static::MAX_DIGIT2 : $sum;
+
+            $temp = static::BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);
+
+            $x_value[$i] = (int)($sum - static::BASE_FULL * $temp);
+            $x_value[$j] = $temp;
+        }
+
+        if ($j == $y_size) { // ie. if $y_size is odd
+            $sum = $x_value[$i] - $y_value[$i] - $carry;
+            $carry = $sum < 0;
+            $x_value[$i] = $carry ? $sum + static::BASE_FULL : $sum;
+            ++$i;
+        }
+
+        if ($carry) {
+            for (; !$x_value[$i]; ++$i) {
+                $x_value[$i] = static::MAX_DIGIT;
+            }
+            --$x_value[$i];
+        }
+
+        return [
+            self::VALUE => self::trim($x_value),
+            self::SIGN => $x_negative
+        ];
+    }
+
+    /**
+     * Performs multiplication.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     */
+    protected static function multiplyHelper(array $x_value, $x_negative, array $y_value, $y_negative)
+    {
+        //if ( $x_value == $y_value ) {
+        //    return [
+        //        self::VALUE => self::square($x_value),
+        //        self::SIGN => $x_sign != $y_value
+        //    ];
+        //}
+
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return [
+                self::VALUE => [],
+                self::SIGN => false
+            ];
+        }
+
+        return [
+            self::VALUE => min($x_length, $y_length) < 2 * self::KARATSUBA_CUTOFF ?
+                self::trim(self::regularMultiply($x_value, $y_value)) :
+                self::trim(self::karatsuba($x_value, $y_value)),
+            self::SIGN => $x_negative != $y_negative
+        ];
+    }
+
+    /**
+     * Performs Karatsuba multiplication on two BigIntegers
+     *
+     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=120 MPM 5.2.3}.
+     *
+     * @param array $x_value
+     * @param array $y_value
+     * @return array
+     */
+    private static function karatsuba(array $x_value, array $y_value)
+    {
+        $m = min(count($x_value) >> 1, count($y_value) >> 1);
+
+        if ($m < self::KARATSUBA_CUTOFF) {
+            return self::regularMultiply($x_value, $y_value);
+        }
+
+        $x1 = array_slice($x_value, $m);
+        $x0 = array_slice($x_value, 0, $m);
+        $y1 = array_slice($y_value, $m);
+        $y0 = array_slice($y_value, 0, $m);
+
+        $z2 = self::karatsuba($x1, $y1);
+        $z0 = self::karatsuba($x0, $y0);
+
+        $z1 = self::addHelper($x1, false, $x0, false);
+        $temp = self::addHelper($y1, false, $y0, false);
+        $z1 = self::karatsuba($z1[self::VALUE], $temp[self::VALUE]);
+        $temp = self::addHelper($z2, false, $z0, false);
+        $z1 = self::subtractHelper($z1, false, $temp[self::VALUE], false);
+
+        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
+        $z1[self::VALUE] = array_merge(array_fill(0, $m, 0), $z1[self::VALUE]);
+
+        $xy = self::addHelper($z2, false, $z1[self::VALUE], $z1[self::SIGN]);
+        $xy = self::addHelper($xy[self::VALUE], $xy[self::SIGN], $z0, false);
+
+        return $xy[self::VALUE];
+    }
+
+    /**
+     * Performs long multiplication on two BigIntegers
+     *
+     * Modeled after 'multiply' in MutableBigInteger.java.
+     *
+     * @param array $x_value
+     * @param array $y_value
+     * @return array
+     */
+    protected static function regularMultiply(array $x_value, array $y_value)
+    {
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return [];
+        }
+
+        $product_value = self::array_repeat(0, $x_length + $y_length);
+
+        // the following for loop could be removed if the for loop following it
+        // (the one with nested for loops) initially set $i to 0, but
+        // doing so would also make the result in one set of unnecessary adds,
+        // since on the outermost loops first pass, $product->value[$k] is going
+        // to always be 0
+
+        $carry = 0;
+        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0
+            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
+            $carry = static::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $product_value[$j] = (int)($temp - static::BASE_FULL * $carry);
+        }
+
+        $product_value[$j] = $carry;
+
+        // the above for loop is what the previous comment was talking about.  the
+        // following for loop is the "one with nested for loops"
+        for ($i = 1; $i < $y_length; ++$i) {
+            $carry = 0;
+
+            for ($j = 0, $k = $i; $j < $x_length; ++$j, ++$k) {
+                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
+                $carry = static::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $product_value[$k] = (int)($temp - static::BASE_FULL * $carry);
+            }
+
+            $product_value[$k] = $carry;
+        }
+
+        return $product_value;
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * @return array{static, static}
+     * @internal This function is based off of
+     *     {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=9 HAC 14.20}.
+     */
+    protected function divideHelper(PHP $y)
+    {
+        if (count($y->value) == 1) {
+            list($q, $r) = $this->divide_digit($this->value, $y->value[0]);
+            $quotient = new static();
+            $remainder = new static();
+            $quotient->value = $q;
+            $remainder->value = [$r];
+            $quotient->is_negative = $this->is_negative != $y->is_negative;
+            return [$this->normalize($quotient), $this->normalize($remainder)];
+        }
+
+        $x = clone $this;
+        $y = clone $y;
+
+        $x_sign = $x->is_negative;
+        $y_sign = $y->is_negative;
+
+        $x->is_negative = $y->is_negative = false;
+
+        $diff = $x->compare($y);
+
+        if (!$diff) {
+            $temp = new static();
+            $temp->value = [1];
+            $temp->is_negative = $x_sign != $y_sign;
+            return [$this->normalize($temp), $this->normalize(static::$zero[static::class])];
+        }
+
+        if ($diff < 0) {
+            // if $x is negative, "add" $y.
+            if ($x_sign) {
+                $x = $y->subtract($x);
+            }
+            return [$this->normalize(static::$zero[static::class]), $this->normalize($x)];
+        }
+
+        // normalize $x and $y as described in HAC 14.23 / 14.24
+        $msb = $y->value[count($y->value) - 1];
+        for ($shift = 0; !($msb & static::MSB); ++$shift) {
+            $msb <<= 1;
+        }
+        $x->lshift($shift);
+        $y->lshift($shift);
+        $y_value = &$y->value;
+
+        $x_max = count($x->value) - 1;
+        $y_max = count($y->value) - 1;
+
+        $quotient = new static();
+        $quotient_value = &$quotient->value;
+        $quotient_value = self::array_repeat(0, $x_max - $y_max + 1);
+
+        static $temp, $lhs, $rhs;
+        if (!isset($temp)) {
+            $temp = new static();
+            $lhs = new static();
+            $rhs = new static();
+        }
+        if (static::class != get_class($temp)) {
+            $temp = new static();
+            $lhs = new static();
+            $rhs = new static();
+        }
+        $temp_value = &$temp->value;
+        $rhs_value =  &$rhs->value;
+
+        // $temp = $y << ($x_max - $y_max-1) in base 2**26
+        $temp_value = array_merge(self::array_repeat(0, $x_max - $y_max), $y_value);
+
+        while ($x->compare($temp) >= 0) {
+            // calculate the "common residue"
+            ++$quotient_value[$x_max - $y_max];
+            $x = $x->subtract($temp);
+            $x_max = count($x->value) - 1;
+        }
+
+        for ($i = $x_max; $i >= $y_max + 1; --$i) {
+            $x_value = &$x->value;
+            $x_window = [
+                isset($x_value[$i]) ? $x_value[$i] : 0,
+                isset($x_value[$i - 1]) ? $x_value[$i - 1] : 0,
+                isset($x_value[$i - 2]) ? $x_value[$i - 2] : 0
+            ];
+            $y_window = [
+                $y_value[$y_max],
+                ($y_max > 0) ? $y_value[$y_max - 1] : 0
+            ];
+
+            $q_index = $i - $y_max - 1;
+            if ($x_window[0] == $y_window[0]) {
+                $quotient_value[$q_index] = static::MAX_DIGIT;
+            } else {
+                $quotient_value[$q_index] = self::safe_divide(
+                    $x_window[0] * static::BASE_FULL + $x_window[1],
+                    $y_window[0]
+                );
+            }
+
+            $temp_value = [$y_window[1], $y_window[0]];
+
+            $lhs->value = [$quotient_value[$q_index]];
+            $lhs = $lhs->multiply($temp);
+
+            $rhs_value = [$x_window[2], $x_window[1], $x_window[0]];
+
+            while ($lhs->compare($rhs) > 0) {
+                --$quotient_value[$q_index];
+
+                $lhs->value = [$quotient_value[$q_index]];
+                $lhs = $lhs->multiply($temp);
+            }
+
+            $adjust = self::array_repeat(0, $q_index);
+            $temp_value = [$quotient_value[$q_index]];
+            $temp = $temp->multiply($y);
+            $temp_value = &$temp->value;
+            if (count($temp_value)) {
+                $temp_value = array_merge($adjust, $temp_value);
+            }
+
+            $x = $x->subtract($temp);
+
+            if ($x->compare(static::$zero[static::class]) < 0) {
+                $temp_value = array_merge($adjust, $y_value);
+                $x = $x->add($temp);
+
+                --$quotient_value[$q_index];
+            }
+
+            $x_max = count($x_value) - 1;
+        }
+
+        // unnormalize the remainder
+        $x->rshift($shift);
+
+        $quotient->is_negative = $x_sign != $y_sign;
+
+        // calculate the "common residue", if appropriate
+        if ($x_sign) {
+            $y->rshift($shift);
+            $x = $y->subtract($x);
+        }
+
+        return [$this->normalize($quotient), $this->normalize($x)];
+    }
+
+    /**
+     * Divides a BigInteger by a regular integer
+     *
+     * abc / x = a00 / x + b0 / x + c / x
+     *
+     * @param array $dividend
+     * @param int $divisor
+     * @return array
+     */
+    private static function divide_digit(array $dividend, $divisor)
+    {
+        $carry = 0;
+        $result = [];
+
+        for ($i = count($dividend) - 1; $i >= 0; --$i) {
+            $temp = static::BASE_FULL * $carry + $dividend[$i];
+            $result[$i] = self::safe_divide($temp, $divisor);
+            $carry = (int)($temp - $divisor * $result[$i]);
+        }
+
+        return [$result, $carry];
+    }
+
+    /**
+     * Single digit division
+     *
+     * Even if int64 is being used the division operator will return a float64 value
+     * if the dividend is not evenly divisible by the divisor. Since a float64 doesn't
+     * have the precision of int64 this is a problem so, when int64 is being used,
+     * we'll guarantee that the dividend is divisible by first subtracting the remainder.
+     *
+     * @param int $x
+     * @param int $y
+     * @return int
+     */
+    private static function safe_divide($x, $y)
+    {
+        if (static::BASE === 26) {
+            return (int)($x / $y);
+        }
+
+        // static::BASE === 31
+        /** @var int */
+        return ($x - ($x % $y)) / $y;
+    }
+
+    /**
+     * Convert an array / boolean to a PHP BigInteger object
+     *
+     * @param array $arr
+     * @return static
+     */
+    protected function convertToObj(array $arr)
+    {
+        $result = new static();
+        $result->value = $arr[self::VALUE];
+        $result->is_negative = $arr[self::SIGN];
+
+        return $this->normalize($result);
+    }
+
+    /**
+     * Normalize
+     *
+     * Removes leading zeros and truncates (if necessary) to maintain the appropriate precision
+     *
+     * @param PHP $result
+     * @return static
+     */
+    protected function normalize(PHP $result)
+    {
+        $result->precision = $this->precision;
+        $result->bitmask = $this->bitmask;
+
+        $value = &$result->value;
+
+        if (!count($value)) {
+            $result->is_negative = false;
+            return $result;
+        }
+
+        $value = static::trim($value);
+
+        if (!empty($result->bitmask->value)) {
+            $length = min(count($value), count($result->bitmask->value));
+            $value = array_slice($value, 0, $length);
+
+            for ($i = 0; $i < $length; ++$i) {
+                $value[$i] = $value[$i] & $result->bitmask->value[$i];
+            }
+
+            $value = static::trim($value);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return int
+     * @see static::compare()
+     */
+    protected static function compareHelper(array $x_value, $x_negative, array $y_value, $y_negative)
+    {
+        if ($x_negative != $y_negative) {
+            return (!$x_negative && $y_negative) ? 1 : -1;
+        }
+
+        $result = $x_negative ? -1 : 1;
+
+        if (count($x_value) != count($y_value)) {
+            return (count($x_value) > count($y_value)) ? $result : -$result;
+        }
+        $size = max(count($x_value), count($y_value));
+
+        $x_value = array_pad($x_value, $size, 0);
+        $y_value = array_pad($y_value, $size, 0);
+
+        for ($i = count($x_value) - 1; $i >= 0; --$i) {
+            if ($x_value[$i] != $y_value[$i]) {
+                return ($x_value[$i] > $y_value[$i]) ? $result : -$result;
+            }
+        }
+
+        return 0;
+    }
+
+    /**
+     * Absolute value.
+     *
+     * @return PHP
+     */
+    public function abs()
+    {
+        $temp = new static();
+        $temp->value = $this->value;
+
+        return $temp;
+    }
+
+    /**
+     * Trim
+     *
+     * Removes leading zeros
+     *
+     * @param list<static> $value
+     * @return list<static>
+     */
+    protected static function trim(array $value)
+    {
+        for ($i = count($value) - 1; $i >= 0; --$i) {
+            if ($value[$i]) {
+                break;
+            }
+            unset($value[$i]);
+        }
+
+        return $value;
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
+     *
+     * @param int $shift
+     * @return PHP
+     */
+    public function bitwise_rightShift($shift)
+    {
+        $temp = new static();
+
+        // could just replace lshift with this, but then all lshift() calls would need to be rewritten
+        // and I don't want to do that...
+        $temp->value = $this->value;
+        $temp->rshift($shift);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
+     *
+     * @param int $shift
+     * @return PHP
+     */
+    public function bitwise_leftShift($shift)
+    {
+        $temp = new static();
+        // could just replace _rshift with this, but then all _lshift() calls would need to be rewritten
+        // and I don't want to do that...
+        $temp->value = $this->value;
+        $temp->lshift($shift);
+
+        return $this->normalize($temp);
+    }
+
+    /**
+     * Converts 32-bit integers to bytes.
+     *
+     * @param int $x
+     * @return string
+     */
+    private static function int2bytes($x)
+    {
+        return ltrim(pack('N', $x), chr(0));
+    }
+
+    /**
+     * Array Repeat
+     *
+     * @param int $input
+     * @param int $multiplier
+     * @return array
+     */
+    protected static function array_repeat($input, $multiplier)
+    {
+        return $multiplier ? array_fill(0, $multiplier, $input) : [];
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits.
+     *
+     * @param int $shift
+     */
+    protected function lshift($shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_digits = (int)($shift / static::BASE);
+        $shift %= static::BASE;
+        $shift = 1 << $shift;
+
+        $carry = 0;
+
+        for ($i = 0; $i < count($this->value); ++$i) {
+            $temp = $this->value[$i] * $shift + $carry;
+            $carry = static::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $this->value[$i] = (int)($temp - $carry * static::BASE_FULL);
+        }
+
+        if ($carry) {
+            $this->value[count($this->value)] = $carry;
+        }
+
+        while ($num_digits--) {
+            array_unshift($this->value, 0);
+        }
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits.
+     *
+     * @param int $shift
+     */
+    protected function rshift($shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_digits = (int)($shift / static::BASE);
+        $shift %= static::BASE;
+        $carry_shift = static::BASE - $shift;
+        $carry_mask = (1 << $shift) - 1;
+
+        if ($num_digits) {
+            $this->value = array_slice($this->value, $num_digits);
+        }
+
+        $carry = 0;
+
+        for ($i = count($this->value) - 1; $i >= 0; --$i) {
+            $temp = $this->value[$i] >> $shift | $carry;
+            $carry = ($this->value[$i] & $carry_mask) << $carry_shift;
+            $this->value[$i] = $temp;
+        }
+
+        $this->value = static::trim($this->value);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param PHP $e
+     * @param PHP $n
+     * @return PHP
+     */
+    protected function powModInner(PHP $e, PHP $n)
+    {
+        try {
+            $class = static::$modexpEngine[static::class];
+            return $class::powModHelper($this, $e, $n, static::class);
+        } catch (\Exception $err) {
+            return PHP\DefaultEngine::powModHelper($this, $e, $n, static::class);
+        }
+    }
+
+    /**
+     * Performs squaring
+     *
+     * @param list<static> $x
+     * @return list<static>
+     */
+    protected static function square(array $x)
+    {
+        return count($x) < 2 * self::KARATSUBA_CUTOFF ?
+            self::trim(self::baseSquare($x)) :
+            self::trim(self::karatsubaSquare($x));
+    }
+
+    /**
+     * Performs traditional squaring on two BigIntegers
+     *
+     * Squaring can be done faster than multiplying a number by itself can be.  See
+     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=7 HAC 14.2.4} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=141 MPM 5.3} for more information.
+     *
+     * @param array $value
+     * @return array
+     */
+    protected static function baseSquare(array $value)
+    {
+        if (empty($value)) {
+            return [];
+        }
+        $square_value = self::array_repeat(0, 2 * count($value));
+
+        for ($i = 0, $max_index = count($value) - 1; $i <= $max_index; ++$i) {
+            $i2 = $i << 1;
+
+            $temp = $square_value[$i2] + $value[$i] * $value[$i];
+            $carry = static::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $square_value[$i2] = (int)($temp - static::BASE_FULL * $carry);
+
+            // note how we start from $i+1 instead of 0 as we do in multiplication.
+            for ($j = $i + 1, $k = $i2 + 1; $j <= $max_index; ++$j, ++$k) {
+                $temp = $square_value[$k] + 2 * $value[$j] * $value[$i] + $carry;
+                $carry = static::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $square_value[$k] = (int)($temp - static::BASE_FULL * $carry);
+            }
+
+            // the following line can yield values larger 2**15.  at this point, PHP should switch
+            // over to floats.
+            $square_value[$i + $max_index + 1] = $carry;
+        }
+
+        return $square_value;
+    }
+
+    /**
+     * Performs Karatsuba "squaring" on two BigIntegers
+     *
+     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=151 MPM 5.3.4}.
+     *
+     * @param array $value
+     * @return array
+     */
+    protected static function karatsubaSquare(array $value)
+    {
+        $m = count($value) >> 1;
+
+        if ($m < self::KARATSUBA_CUTOFF) {
+            return self::baseSquare($value);
+        }
+
+        $x1 = array_slice($value, $m);
+        $x0 = array_slice($value, 0, $m);
+
+        $z2 = self::karatsubaSquare($x1);
+        $z0 = self::karatsubaSquare($x0);
+
+        $z1 = self::addHelper($x1, false, $x0, false);
+        $z1 = self::karatsubaSquare($z1[self::VALUE]);
+        $temp = self::addHelper($z2, false, $z0, false);
+        $z1 = self::subtractHelper($z1, false, $temp[self::VALUE], false);
+
+        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
+        $z1[self::VALUE] = array_merge(array_fill(0, $m, 0), $z1[self::VALUE]);
+
+        $xx = self::addHelper($z2, false, $z1[self::VALUE], $z1[self::SIGN]);
+        $xx = self::addHelper($xx[self::VALUE], $xx[self::SIGN], $z0, false);
+
+        return $xx[self::VALUE];
+    }
+
+    /**
+     * Make the current number odd
+     *
+     * If the current number is odd it'll be unchanged.  If it's even, one will be added to it.
+     *
+     * @see self::randomPrime()
+     */
+    protected function make_odd()
+    {
+        $this->value[0] |= 1;
+    }
+
+    /**
+     * Test the number against small primes.
+     *
+     * @see self::isPrime()
+     */
+    protected function testSmallPrimes()
+    {
+        if ($this->value == [1]) {
+            return false;
+        }
+        if ($this->value == [2]) {
+            return true;
+        }
+        if (~$this->value[0] & 1) {
+            return false;
+        }
+
+        $value = $this->value;
+        foreach (static::PRIMES as $prime) {
+            list(, $r) = self::divide_digit($value, $prime);
+            if (!$r) {
+                return count($value) == 1 && $value[0] == $prime;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Scan for 1 and right shift by that amount
+     *
+     * ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
+     *
+     * @param PHP $r
+     * @return int
+     * @see self::isPrime()
+     */
+    public static function scan1divide(PHP $r)
+    {
+        $r_value = &$r->value;
+        for ($i = 0, $r_length = count($r_value); $i < $r_length; ++$i) {
+            $temp = ~$r_value[$i] & static::MAX_DIGIT;
+            for ($j = 1; ($temp >> $j) & 1; ++$j) {
+            }
+            if ($j <= static::BASE) {
+                break;
+            }
+        }
+        $s = static::BASE * $i + $j;
+        $r->rshift($s);
+        return $s;
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param PHP $n
+     * @return PHP
+     */
+    protected function powHelper(PHP $n)
+    {
+        if ($n->compare(static::$zero[static::class]) == 0) {
+            return new static(1);
+        } // n^0 = 1
+
+        $temp = clone $this;
+        while (!$n->equals(static::$one[static::class])) {
+            $temp = $temp->multiply($this);
+            $n = $n->subtract(static::$one[static::class]);
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Is Odd?
+     *
+     * @return bool
+     */
+    public function isOdd()
+    {
+        return (bool)($this->value[0] & 1);
+    }
+
+    /**
+     * Tests if a bit is set
+     *
+     * @return bool
+     */
+    public function testBit($x)
+    {
+        $digit = (int) floor($x / static::BASE);
+        $bit = $x % static::BASE;
+
+        if (!isset($this->value[$digit])) {
+            return false;
+        }
+
+        return (bool)($this->value[$digit] & (1 << $bit));
+    }
+
+    /**
+     * Is Negative?
+     *
+     * @return bool
+     */
+    public function isNegative()
+    {
+        return $this->is_negative;
+    }
+
+    /**
+     * Negate
+     *
+     * Given $k, returns -$k
+     *
+     * @return static
+     */
+    public function negate()
+    {
+        $temp = clone $this;
+        $temp->is_negative = !$temp->is_negative;
+
+        return $temp;
+    }
+
+    /**
+     * Bitwise Split
+     *
+     * Splits BigInteger's into chunks of $split bits
+     *
+     * @param int $split
+     * @return list<static>
+     */
+    public function bitwise_split($split)
+    {
+        if ($split < 1) {
+            throw new \RuntimeException('Offset must be greater than 1');
+        }
+
+        $width = (int)($split / static::BASE);
+        if (!$width) {
+            $arr = $this->bitwise_small_split($split);
+            return array_map(function ($digit) {
+                $temp = new static();
+                $temp->value = $digit != 0 ? [$digit] : [];
+                return $temp;
+            }, $arr);
+        }
+
+        $vals = [];
+        $val = $this->value;
+
+        $i = $overflow = 0;
+        $len = count($val);
+        while ($i < $len) {
+            $digit = [];
+            if (!$overflow) {
+                $digit = array_slice($val, $i, $width);
+                $i += $width;
+                $overflow = $split % static::BASE;
+                if ($overflow) {
+                    $mask = (1 << $overflow) - 1;
+                    $temp = isset($val[$i]) ? $val[$i] : 0;
+                    $digit[] = $temp & $mask;
+                }
+            } else {
+                $remaining = static::BASE - $overflow;
+                $tempsplit = $split - $remaining;
+                $tempwidth = (int)($tempsplit / static::BASE + 1);
+                $digit = array_slice($val, $i, $tempwidth);
+                $i += $tempwidth;
+                $tempoverflow = $tempsplit % static::BASE;
+                if ($tempoverflow) {
+                    $tempmask = (1 << $tempoverflow) - 1;
+                    $temp = isset($val[$i]) ? $val[$i] : 0;
+                    $digit[] = $temp & $tempmask;
+                }
+                $newbits = 0;
+                for ($j = count($digit) - 1; $j >= 0; $j--) {
+                    $temp = $digit[$j] & $mask;
+                    $digit[$j] = ($digit[$j] >> $overflow) | ($newbits << $remaining);
+                    $newbits = $temp;
+                }
+                $overflow = $tempoverflow;
+                $mask = $tempmask;
+            }
+            $temp = new static();
+            $temp->value = static::trim($digit);
+            $vals[] = $temp;
+        }
+
+        return array_reverse($vals);
+    }
+
+    /**
+     * Bitwise Split where $split < static::BASE
+     *
+     * @param int $split
+     * @return list<int>
+     */
+    private function bitwise_small_split($split)
+    {
+        $vals = [];
+        $val = $this->value;
+
+        $mask = (1 << $split) - 1;
+
+        $i = $overflow = 0;
+        $len = count($val);
+        $val[] = 0;
+        $remaining = static::BASE;
+        while ($i != $len) {
+            $digit = $val[$i] & $mask;
+            $val[$i] >>= $split;
+            if (!$overflow) {
+                $remaining -= $split;
+                $overflow = $split <= $remaining ? 0 : $split - $remaining;
+
+                if (!$remaining) {
+                    $i++;
+                    $remaining = static::BASE;
+                    $overflow = 0;
+                }
+            } elseif (++$i != $len) {
+                $tempmask = (1 << $overflow) - 1;
+                $digit |= ($val[$i] & $tempmask) << $remaining;
+                $val[$i] >>= $overflow;
+                $remaining = static::BASE - $overflow;
+                $overflow = $split <= $remaining ? 0 : $split - $remaining;
+            }
+
+            $vals[] = $digit;
+        }
+
+        while ($vals[count($vals) - 1] == 0) {
+            unset($vals[count($vals) - 1]);
+        }
+
+        return array_reverse($vals);
+    }
+
+    /**
+     * @return bool
+     */
+    protected static function testJITOnWindows()
+    {
+        // see https://github.com/php/php-src/issues/11917
+        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' && function_exists('opcache_get_status') && PHP_VERSION_ID < 80213 && !defined('PHPSECLIB_ALLOW_JIT')) {
+            $status = opcache_get_status();
+            if ($status && isset($status['jit']) && $status['jit']['enabled'] && $status['jit']['on']) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Return the size of a BigInteger in bits
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        $max = count($this->value) - 1;
+        return $max != -1 ?
+            $max * static::BASE + intval(ceil(log($this->value[$max] + 1, 2))) :
+            0;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Base.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Base.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,143 @@
+<?php
+
+/**
+ * PHP Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP;
+
+use phpseclib3\Math\BigInteger\Engines\PHP;
+
+/**
+ * PHP Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Base extends PHP
+{
+    /**
+     * Cache constants
+     *
+     * $cache[self::VARIABLE] tells us whether or not the cached data is still valid.
+     *
+     */
+    const VARIABLE = 0;
+    /**
+     * $cache[self::DATA] contains the cached data.
+     *
+     */
+    const DATA = 1;
+
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return static::class != __CLASS__;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * The most naive approach to modular exponentiation has very unreasonable requirements, and
+     * and although the approach involving repeated squaring does vastly better, it, too, is impractical
+     * for our purposes.  The reason being that division - by far the most complicated and time-consuming
+     * of the basic operations (eg. +,-,*,/) - occurs multiple times within it.
+     *
+     * Modular reductions resolve this issue.  Although an individual modular reduction takes more time
+     * then an individual division, when performed in succession (with the same modulo), they're a lot faster.
+     *
+     * The two most commonly used modular reductions are Barrett and Montgomery reduction.  Montgomery reduction,
+     * although faster, only works when the gcd of the modulo and of the base being used is 1.  In RSA, when the
+     * base is a power of two, the modulo - a product of two primes - is always going to have a gcd of 1 (because
+     * the product of two odd numbers is odd), but what about when RSA isn't used?
+     *
+     * In contrast, Barrett reduction has no such constraint.  As such, some bigint implementations perform a
+     * Barrett reduction after every operation in the modpow function.  Others perform Barrett reductions when the
+     * modulo is even and Montgomery reductions when the modulo is odd.  BigInteger.java's modPow method, however,
+     * uses a trick involving the Chinese Remainder Theorem to factor the even modulo into two numbers - one odd and
+     * the other, a power of two - and recombine them, later.  This is the method that this modPow function uses.
+     * {@link http://islab.oregonstate.edu/papers/j34monex.pdf Montgomery Reduction with Even Modulus} elaborates.
+     *
+     * @param PHP $x
+     * @param PHP $e
+     * @param PHP $n
+     * @param string $class
+     * @return PHP
+     */
+    protected static function powModHelper(PHP $x, PHP $e, PHP $n, $class)
+    {
+        if (empty($e->value)) {
+            $temp = new $class();
+            $temp->value = [1];
+            return $x->normalize($temp);
+        }
+
+        if ($e->value == [1]) {
+            list(, $temp) = $x->divide($n);
+            return $x->normalize($temp);
+        }
+
+        if ($e->value == [2]) {
+            $temp = new $class();
+            $temp->value = $class::square($x->value);
+            list(, $temp) = $temp->divide($n);
+            return $x->normalize($temp);
+        }
+
+        return $x->normalize(static::slidingWindow($x, $e, $n, $class));
+    }
+
+    /**
+     * Modular reduction preparation
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return array
+     */
+    protected static function prepareReduce(array $x, array $n, $class)
+    {
+        return static::reduce($x, $n, $class);
+    }
+
+    /**
+     * Modular multiply
+     *
+     * @param array $x
+     * @param array $y
+     * @param array $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return array
+     */
+    protected static function multiplyReduce(array $x, array $y, array $n, $class)
+    {
+        $temp = $class::multiplyHelper($x, false, $y, false);
+        return static::reduce($temp[self::VALUE], $n, $class);
+    }
+
+    /**
+     * Modular square
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @see self::slidingWindow()
+     * @return array
+     */
+    protected static function squareReduce(array $x, array $n, $class)
+    {
+        return static::reduce($class::square($x), $n, $class);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/DefaultEngine.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/DefaultEngine.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * PHP Default Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP;
+
+use phpseclib3\Math\BigInteger\Engines\PHP\Reductions\EvalBarrett;
+
+/**
+ * PHP Default Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class DefaultEngine extends EvalBarrett
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Montgomery.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP;
+
+use phpseclib3\Math\BigInteger\Engines\Engine;
+use phpseclib3\Math\BigInteger\Engines\PHP;
+use phpseclib3\Math\BigInteger\Engines\PHP\Reductions\PowerOfTwo;
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Montgomery extends Base
+{
+    /**
+     * Test for engine validity
+     *
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return static::class != __CLASS__;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @template T of Engine
+     * @param Engine $x
+     * @param Engine $e
+     * @param Engine $n
+     * @param class-string<T> $class
+     * @return T
+     */
+    protected static function slidingWindow(Engine $x, Engine $e, Engine $n, $class)
+    {
+        // is the modulo odd?
+        if ($n->value[0] & 1) {
+            return parent::slidingWindow($x, $e, $n, $class);
+        }
+        // if it's not, it's even
+
+        // find the lowest set bit (eg. the max pow of 2 that divides $n)
+        for ($i = 0; $i < count($n->value); ++$i) {
+            if ($n->value[$i]) {
+                $temp = decbin($n->value[$i]);
+                $j = strlen($temp) - strrpos($temp, '1') - 1;
+                $j += $class::BASE * $i;
+                break;
+            }
+        }
+        // at this point, 2^$j * $n/(2^$j) == $n
+
+        $mod1 = clone $n;
+        $mod1->rshift($j);
+        $mod2 = new $class();
+        $mod2->value = [1];
+        $mod2->lshift($j);
+
+        $part1 = $mod1->value != [1] ? parent::slidingWindow($x, $e, $mod1, $class) : new $class();
+        $part2 = PowerOfTwo::slidingWindow($x, $e, $mod2, $class);
+
+        $y1 = $mod2->modInverse($mod1);
+        $y2 = $mod1->modInverse($mod2);
+
+        $result = $part1->multiply($mod2);
+        $result = $result->multiply($y1);
+
+        $temp = $part2->multiply($mod1);
+        $temp = $temp->multiply($y2);
+
+        $result = $result->add($temp);
+        list(, $result) = $result->divide($n);
+
+        return $result;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/OpenSSL.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/OpenSSL.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP;
+
+use phpseclib3\Math\BigInteger\Engines\OpenSSL as Progenitor;
+
+/**
+ * OpenSSL Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class OpenSSL extends Progenitor
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Barrett.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Barrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Barrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,281 @@
+<?php
+
+/**
+ * PHP Barrett Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP;
+use phpseclib3\Math\BigInteger\Engines\PHP\Base;
+
+/**
+ * PHP Barrett Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Barrett extends Base
+{
+    /**
+     * Barrett Modular Reduction
+     *
+     * See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=14 HAC 14.3.3} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=165 MPM 6.2.5} for more information.  Modified slightly,
+     * so as not to require negative numbers (initially, this script didn't support negative numbers).
+     *
+     * Employs "folding", as described at
+     * {@link http://www.cosic.esat.kuleuven.be/publications/thesis-149.pdf#page=66 thesis-149.pdf#page=66}.  To quote from
+     * it, "the idea [behind folding] is to find a value x' such that x (mod m) = x' (mod m), with x' being smaller than x."
+     *
+     * Unfortunately, the "Barrett Reduction with Folding" algorithm described in thesis-149.pdf is not, as written, all that
+     * usable on account of (1) its not using reasonable radix points as discussed in
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=162 MPM 6.2.2} and (2) the fact that, even with reasonable
+     * radix points, it only works when there are an even number of digits in the denominator.  The reason for (2) is that
+     * (x >> 1) + (x >> 1) != x / 2 + x / 2.  If x is even, they're the same, but if x is odd, they're not.  See the in-line
+     * comments for details.
+     *
+     * @param array $n
+     * @param array $m
+     * @param class-string<PHP> $class
+     * @return array
+     */
+    protected static function reduce(array $n, array $m, $class)
+    {
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        $m_length = count($m);
+
+        // if (self::compareHelper($n, $static::square($m)) >= 0) {
+        if (count($n) >= 2 * $m_length) {
+            $lhs = new $class();
+            $rhs = new $class();
+            $lhs->value = $n;
+            $rhs->value = $m;
+            list(, $temp) = $lhs->divide($rhs);
+            return $temp->value;
+        }
+
+        // if (m.length >> 1) + 2 <= m.length then m is too small and n can't be reduced
+        if ($m_length < 5) {
+            return self::regularBarrett($n, $m, $class);
+        }
+        // n = 2 * m.length
+
+        if (($key = array_search($m, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $m;
+
+            $lhs = new $class();
+            $lhs_value = &$lhs->value;
+            $lhs_value = self::array_repeat(0, $m_length + ($m_length >> 1));
+            $lhs_value[] = 1;
+            $rhs = new $class();
+            $rhs->value = $m;
+
+            list($u, $m1) = $lhs->divide($rhs);
+            $u = $u->value;
+            $m1 = $m1->value;
+
+            $cache[self::DATA][] = [
+                'u' => $u, // m.length >> 1 (technically (m.length >> 1) + 1)
+                'm1' => $m1 // m.length
+            ];
+        } else {
+            extract($cache[self::DATA][$key]);
+        }
+
+        $cutoff = $m_length + ($m_length >> 1);
+        $lsd = array_slice($n, 0, $cutoff); // m.length + (m.length >> 1)
+        $msd = array_slice($n, $cutoff);    // m.length >> 1
+
+        $lsd = self::trim($lsd);
+        $temp = $class::multiplyHelper($msd, false, $m1, false); // m.length + (m.length >> 1)
+        $n = $class::addHelper($lsd, false, $temp[self::VALUE], false); // m.length + (m.length >> 1) + 1 (so basically we're adding two same length numbers)
+        //if ($m_length & 1) {
+        //    return self::regularBarrett($n[self::VALUE], $m, $class);
+        //}
+
+        // (m.length + (m.length >> 1) + 1) - (m.length - 1) == (m.length >> 1) + 2
+        $temp = array_slice($n[self::VALUE], $m_length - 1);
+        // if even: ((m.length >> 1) + 2) + (m.length >> 1) == m.length + 2
+        // if odd:  ((m.length >> 1) + 2) + (m.length >> 1) == (m.length - 1) + 2 == m.length + 1
+        $temp = $class::multiplyHelper($temp, false, $u, false);
+        // if even: (m.length + 2) - ((m.length >> 1) + 1) = m.length - (m.length >> 1) + 1
+        // if odd:  (m.length + 1) - ((m.length >> 1) + 1) = m.length - (m.length >> 1)
+        $temp = array_slice($temp[self::VALUE], ($m_length >> 1) + 1);
+        // if even: (m.length - (m.length >> 1) + 1) + m.length = 2 * m.length - (m.length >> 1) + 1
+        // if odd:  (m.length - (m.length >> 1)) + m.length     = 2 * m.length - (m.length >> 1)
+        $temp = $class::multiplyHelper($temp, false, $m, false);
+
+        // at this point, if m had an odd number of digits, we'd be subtracting a 2 * m.length - (m.length >> 1) digit
+        // number from a m.length + (m.length >> 1) + 1 digit number.  ie. there'd be an extra digit and the while loop
+        // following this comment would loop a lot (hence our calling _regularBarrett() in that situation).
+
+        $result = $class::subtractHelper($n[self::VALUE], false, $temp[self::VALUE], false);
+
+        while (self::compareHelper($result[self::VALUE], $result[self::SIGN], $m, false) >= 0) {
+            $result = $class::subtractHelper($result[self::VALUE], $result[self::SIGN], $m, false);
+        }
+
+        return $result[self::VALUE];
+    }
+
+    /**
+     * (Regular) Barrett Modular Reduction
+     *
+     * For numbers with more than four digits BigInteger::_barrett() is faster.  The difference between that and this
+     * is that this function does not fold the denominator into a smaller form.
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    private static function regularBarrett(array $x, array $n, $class)
+    {
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        $n_length = count($n);
+
+        if (count($x) > 2 * $n_length) {
+            $lhs = new $class();
+            $rhs = new $class();
+            $lhs->value = $x;
+            $rhs->value = $n;
+            list(, $temp) = $lhs->divide($rhs);
+            return $temp->value;
+        }
+
+        if (($key = array_search($n, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $n;
+            $lhs = new $class();
+            $lhs_value = &$lhs->value;
+            $lhs_value = self::array_repeat(0, 2 * $n_length);
+            $lhs_value[] = 1;
+            $rhs = new $class();
+            $rhs->value = $n;
+            list($temp, ) = $lhs->divide($rhs); // m.length
+            $cache[self::DATA][] = $temp->value;
+        }
+
+        // 2 * m.length - (m.length - 1) = m.length + 1
+        $temp = array_slice($x, $n_length - 1);
+        // (m.length + 1) + m.length = 2 * m.length + 1
+        $temp = $class::multiplyHelper($temp, false, $cache[self::DATA][$key], false);
+        // (2 * m.length + 1) - (m.length - 1) = m.length + 2
+        $temp = array_slice($temp[self::VALUE], $n_length + 1);
+
+        // m.length + 1
+        $result = array_slice($x, 0, $n_length + 1);
+        // m.length + 1
+        $temp = self::multiplyLower($temp, false, $n, false, $n_length + 1, $class);
+        // $temp == array_slice($class::regularMultiply($temp, false, $n, false)->value, 0, $n_length + 1)
+
+        if (self::compareHelper($result, false, $temp[self::VALUE], $temp[self::SIGN]) < 0) {
+            $corrector_value = self::array_repeat(0, $n_length + 1);
+            $corrector_value[count($corrector_value)] = 1;
+            $result = $class::addHelper($result, false, $corrector_value, false);
+            $result = $result[self::VALUE];
+        }
+
+        // at this point, we're subtracting a number with m.length + 1 digits from another number with m.length + 1 digits
+        $result = $class::subtractHelper($result, false, $temp[self::VALUE], $temp[self::SIGN]);
+        while (self::compareHelper($result[self::VALUE], $result[self::SIGN], $n, false) > 0) {
+            $result = $class::subtractHelper($result[self::VALUE], $result[self::SIGN], $n, false);
+        }
+
+        return $result[self::VALUE];
+    }
+
+    /**
+     * Performs long multiplication up to $stop digits
+     *
+     * If you're going to be doing array_slice($product->value, 0, $stop), some cycles can be saved.
+     *
+     * @see self::regularBarrett()
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @param int $stop
+     * @param string $class
+     * @return array
+     */
+    private static function multiplyLower(array $x_value, $x_negative, array $y_value, $y_negative, $stop, $class)
+    {
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return [
+                self::VALUE => [],
+                self::SIGN => false
+            ];
+        }
+
+        if ($x_length < $y_length) {
+            $temp = $x_value;
+            $x_value = $y_value;
+            $y_value = $temp;
+
+            $x_length = count($x_value);
+            $y_length = count($y_value);
+        }
+
+        $product_value = self::array_repeat(0, $x_length + $y_length);
+
+        // the following for loop could be removed if the for loop following it
+        // (the one with nested for loops) initially set $i to 0, but
+        // doing so would also make the result in one set of unnecessary adds,
+        // since on the outermost loops first pass, $product->value[$k] is going
+        // to always be 0
+
+        $carry = 0;
+
+        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0, $k = $i
+            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
+            $carry = $class::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $product_value[$j] = (int) ($temp - $class::BASE_FULL * $carry);
+        }
+
+        if ($j < $stop) {
+            $product_value[$j] = $carry;
+        }
+
+        // the above for loop is what the previous comment was talking about.  the
+        // following for loop is the "one with nested for loops"
+
+        for ($i = 1; $i < $y_length; ++$i) {
+            $carry = 0;
+
+            for ($j = 0, $k = $i; $j < $x_length && $k < $stop; ++$j, ++$k) {
+                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
+                $carry = $class::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $product_value[$k] = (int) ($temp - $class::BASE_FULL * $carry);
+            }
+
+            if ($k < $stop) {
+                $product_value[$k] = $carry;
+            }
+        }
+
+        return [
+            self::VALUE => self::trim($product_value),
+            self::SIGN => $x_negative != $y_negative
+        ];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Classic.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Classic.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Classic.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * PHP Classic Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP\Base;
+
+/**
+ * PHP Classic Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Classic extends Base
+{
+    /**
+     * Regular Division
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    protected static function reduce(array $x, array $n, $class)
+    {
+        $lhs = new $class();
+        $lhs->value = $x;
+        $rhs = new $class();
+        $rhs->value = $n;
+        list(, $temp) = $lhs->divide($rhs);
+        return $temp->value;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,484 @@
+<?php
+
+/**
+ * PHP Dynamic Barrett Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP;
+use phpseclib3\Math\BigInteger\Engines\PHP\Base;
+
+/**
+ * PHP Dynamic Barrett Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class EvalBarrett extends Base
+{
+    /**
+     * Custom Reduction Function
+     *
+     * @see self::generateCustomReduction
+     */
+    private static $custom_reduction;
+
+    /**
+     * Barrett Modular Reduction
+     *
+     * This calls a dynamically generated loop unrolled function that's specific to a given modulo.
+     * Array lookups are avoided as are if statements testing for how many bits the host OS supports, etc.
+     *
+     * @param array $n
+     * @param array $m
+     * @param string $class
+     * @return array
+     */
+    protected static function reduce(array $n, array $m, $class)
+    {
+        $inline = self::$custom_reduction;
+        return $inline($n);
+    }
+
+    /**
+     * Generate Custom Reduction
+     *
+     * @param PHP $m
+     * @param string $class
+     * @return callable
+     */
+    protected static function generateCustomReduction(PHP $m, $class)
+    {
+        $m_length = count($m->value);
+
+        if ($m_length < 5) {
+            $code = '
+                $lhs = new ' . $class . '();
+                $lhs->value = $x;
+                $rhs = new ' . $class . '();
+                $rhs->value = [' .
+                implode(',', array_map(self::class . '::float2string', $m->value)) . '];
+                list(, $temp) = $lhs->divide($rhs);
+                return $temp->value;
+            ';
+            eval('$func = function ($x) { ' . $code . '};');
+            self::$custom_reduction = $func;
+            //self::$custom_reduction = \Closure::bind($func, $m, $class);
+            return $func;
+        }
+
+        $lhs = new $class();
+        $lhs_value = &$lhs->value;
+
+        $lhs_value = self::array_repeat(0, $m_length + ($m_length >> 1));
+        $lhs_value[] = 1;
+        $rhs = new $class();
+
+        list($u, $m1) = $lhs->divide($m);
+
+        if ($class::BASE != 26) {
+            $u = $u->value;
+        } else {
+            $lhs_value = self::array_repeat(0, 2 * $m_length);
+            $lhs_value[] = 1;
+            $rhs = new $class();
+
+            list($u) = $lhs->divide($m);
+            $u = $u->value;
+        }
+
+        $m = $m->value;
+        $m1 = $m1->value;
+
+        $cutoff = count($m) + (count($m) >> 1);
+
+        $code = '
+            if (count($n) >= ' . (2 * count($m)) . ') {
+                $lhs = new ' . $class . '();
+                $rhs = new ' . $class . '();
+                $lhs->value = $n;
+                $rhs->value = [' .
+                implode(',', array_map(self::class . '::float2string', $m)) . '];
+                list(, $temp) = $lhs->divide($rhs);
+                return $temp->value;
+            }
+
+            $lsd = array_slice($n, 0, ' . $cutoff . ');
+            $msd = array_slice($n, ' . $cutoff . ');';
+
+        $code .= self::generateInlineTrim('msd');
+        $code .= self::generateInlineMultiply('msd', $m1, 'temp', $class);
+        $code .= self::generateInlineAdd('lsd', 'temp', 'n', $class);
+
+        $code .= '$temp = array_slice($n, ' . (count($m) - 1) . ');';
+        $code .= self::generateInlineMultiply('temp', $u, 'temp2', $class);
+        $code .= self::generateInlineTrim('temp2');
+
+        $code .= $class::BASE == 26 ?
+            '$temp = array_slice($temp2, ' . (count($m) + 1) . ');' :
+            '$temp = array_slice($temp2, ' . ((count($m) >> 1) + 1) . ');';
+        $code .= self::generateInlineMultiply('temp', $m, 'temp2', $class);
+        $code .= self::generateInlineTrim('temp2');
+
+        /*
+        if ($class::BASE == 26) {
+            $code.= '$n = array_slice($n, 0, ' . (count($m) + 1) . ');
+                     $temp2 = array_slice($temp2, 0, ' . (count($m) + 1) . ');';
+        }
+        */
+
+        $code .= self::generateInlineSubtract2('n', 'temp2', 'temp', $class);
+
+        $subcode = self::generateInlineSubtract1('temp', $m, 'temp2', $class);
+        $subcode .= '$temp = $temp2;';
+
+        $code .= self::generateInlineCompare($m, 'temp', $subcode);
+
+        $code .= 'return $temp;';
+
+        eval('$func = function ($n) { ' . $code . '};');
+
+        self::$custom_reduction = $func;
+
+        return $func;
+
+        //self::$custom_reduction = \Closure::bind($func, $m, $class);
+    }
+
+    /**
+     * Inline Trim
+     *
+     * Removes leading zeros
+     *
+     * @param string $name
+     * @return string
+     */
+    private static function generateInlineTrim($name)
+    {
+        return '
+            for ($i = count($' . $name . ') - 1; $i >= 0; --$i) {
+                if ($' . $name . '[$i]) {
+                    break;
+                }
+                unset($' . $name . '[$i]);
+            }';
+    }
+
+    /**
+     * Inline Multiply (unknown, known)
+     *
+     * @param string $input
+     * @param array $arr
+     * @param string $output
+     * @param string $class
+     * @return string
+     */
+    private static function generateInlineMultiply($input, array $arr, $output, $class)
+    {
+        if (!count($arr)) {
+            return 'return [];';
+        }
+
+        $regular = '
+            $length = count($' . $input . ');
+            if (!$length) {
+                $' . $output . ' = [];
+            }else{
+            $' . $output . ' = array_fill(0, $length + ' . count($arr) . ', 0);
+            $carry = 0;';
+
+        for ($i = 0; $i < count($arr); $i++) {
+            $regular .= '
+                $subtemp = $' . $input . '[0] * ' . $arr[$i];
+            $regular .= $i ? ' + $carry;' : ';';
+
+            $regular .= '$carry = ';
+            $regular .= $class::BASE === 26 ?
+            'intval($subtemp / 0x4000000);' :
+            '$subtemp >> 31;';
+            $regular .=
+            '$' . $output . '[' . $i . '] = ';
+            if ($class::BASE === 26) {
+                $regular .= '(int) (';
+            }
+            $regular .= '$subtemp - ' . $class::BASE_FULL . ' * $carry';
+            $regular .= $class::BASE === 26 ? ');' : ';';
+        }
+
+        $regular .= '$' . $output . '[' . count($arr) . '] = $carry;';
+
+        $regular .= '
+            for ($i = 1; $i < $length; ++$i) {';
+
+        for ($j = 0; $j < count($arr); $j++) {
+            $regular .= $j ? '$k++;' : '$k = $i;';
+            $regular .= '
+                $subtemp = $' . $output . '[$k] + $' . $input . '[$i] * ' . $arr[$j];
+            $regular .= $j ? ' + $carry;' : ';';
+
+            $regular .= '$carry = ';
+            $regular .= $class::BASE === 26 ?
+                'intval($subtemp / 0x4000000);' :
+                '$subtemp >> 31;';
+            $regular .=
+                '$' . $output . '[$k] = ';
+            if ($class::BASE === 26) {
+                $regular .= '(int) (';
+            }
+            $regular .= '$subtemp - ' . $class::BASE_FULL . ' * $carry';
+            $regular .= $class::BASE === 26 ? ');' : ';';
+        }
+
+        $regular .= '$' . $output . '[++$k] = $carry; $carry = 0;';
+
+        $regular .= '}}';
+
+        //if (count($arr) < 2 * self::KARATSUBA_CUTOFF) {
+        //}
+
+        return $regular;
+    }
+
+    /**
+     * Inline Addition
+     *
+     * @param string $x
+     * @param string $y
+     * @param string $result
+     * @param string $class
+     * @return string
+     */
+    private static function generateInlineAdd($x, $y, $result, $class)
+    {
+        $code = '
+            $length = max(count($' . $x . '), count($' . $y . '));
+            $' . $result . ' = array_pad($' . $x . ', $length + 1, 0);
+            $_' . $y . ' = array_pad($' . $y . ', $length, 0);
+            $carry = 0;
+            for ($i = 0, $j = 1; $j < $length; $i+=2, $j+=2) {
+                $sum = ($' . $result . '[$j] + $_' . $y . '[$j]) * ' . $class::BASE_FULL . '
+                           + $' . $result . '[$i] + $_' . $y . '[$i] +
+                           $carry;
+                $carry = $sum >= ' . self::float2string($class::MAX_DIGIT2) . ';
+                $sum = $carry ? $sum - ' . self::float2string($class::MAX_DIGIT2) . ' : $sum;';
+
+            $code .= $class::BASE === 26 ?
+                '$upper = intval($sum / 0x4000000); $' . $result . '[$i] = (int) ($sum - ' . $class::BASE_FULL . ' * $upper);' :
+                '$upper = $sum >> 31; $' . $result . '[$i] = $sum - ' . $class::BASE_FULL . ' * $upper;';
+            $code .= '
+                $' . $result . '[$j] = $upper;
+            }
+            if ($j == $length) {
+                $sum = $' . $result . '[$i] + $_' . $y . '[$i] + $carry;
+                $carry = $sum >= ' . self::float2string($class::BASE_FULL) . ';
+                $' . $result . '[$i] = $carry ? $sum - ' . self::float2string($class::BASE_FULL) . ' : $sum;
+                ++$i;
+            }
+            if ($carry) {
+                for (; $' . $result . '[$i] == ' . $class::MAX_DIGIT . '; ++$i) {
+                    $' . $result . '[$i] = 0;
+                }
+                ++$' . $result . '[$i];
+            }';
+            $code .= self::generateInlineTrim($result);
+
+            return $code;
+    }
+
+    /**
+     * Inline Subtraction 2
+     *
+     * For when $known is more digits than $unknown. This is the harder use case to optimize for.
+     *
+     * @param string $known
+     * @param string $unknown
+     * @param string $result
+     * @param string $class
+     * @return string
+     */
+    private static function generateInlineSubtract2($known, $unknown, $result, $class)
+    {
+        $code = '
+            $' . $result . ' = $' . $known . ';
+            $carry = 0;
+            $size = count($' . $unknown . ');
+            for ($i = 0, $j = 1; $j < $size; $i+= 2, $j+= 2) {
+                $sum = ($' . $known . '[$j] - $' . $unknown . '[$j]) * ' . $class::BASE_FULL . ' + $' . $known . '[$i]
+                    - $' . $unknown . '[$i]
+                    - $carry;
+                $carry = $sum < 0;
+                if ($carry) {
+                    $sum+= ' . self::float2string($class::MAX_DIGIT2) . ';
+                }
+                $subtemp = ';
+        $code .= $class::BASE === 26 ?
+            'intval($sum / 0x4000000);' :
+            '$sum >> 31;';
+        $code .= '$' . $result . '[$i] = ';
+        if ($class::BASE === 26) {
+            $code .= '(int) (';
+        }
+        $code .= '$sum - ' . $class::BASE_FULL . ' * $subtemp';
+        if ($class::BASE === 26) {
+            $code .= ')';
+        }
+        $code .= ';
+                $' . $result . '[$j] = $subtemp;
+            }
+            if ($j == $size) {
+                $sum = $' . $known . '[$i] - $' . $unknown . '[$i] - $carry;
+                $carry = $sum < 0;
+                $' . $result . '[$i] = $carry ? $sum + ' . $class::BASE_FULL . ' : $sum;
+                ++$i;
+            }
+
+            if ($carry) {
+                for (; !$' . $result . '[$i]; ++$i) {
+                    $' . $result . '[$i] = ' . $class::MAX_DIGIT . ';
+                }
+                --$' . $result . '[$i];
+            }';
+
+        $code .= self::generateInlineTrim($result);
+
+        return $code;
+    }
+
+    /**
+     * Inline Subtraction 1
+     *
+     * For when $unknown is more digits than $known. This is the easier use case to optimize for.
+     *
+     * @param string $unknown
+     * @param array $known
+     * @param string $result
+     * @param string $class
+     * @return string
+     */
+    private static function generateInlineSubtract1($unknown, array $known, $result, $class)
+    {
+        $code = '$' . $result . ' = $' . $unknown . ';';
+        for ($i = 0, $j = 1; $j < count($known); $i += 2, $j += 2) {
+            $code .= '$sum = $' . $unknown . '[' . $j . '] * ' . $class::BASE_FULL . ' + $' . $unknown . '[' . $i . '] - ';
+            $code .= self::float2string($known[$j] * $class::BASE_FULL + $known[$i]);
+            if ($i != 0) {
+                $code .= ' - $carry';
+            }
+
+            $code .= ';
+                if ($carry = $sum < 0) {
+                    $sum+= ' . self::float2string($class::MAX_DIGIT2) . ';
+                }
+                $subtemp = ';
+            $code .= $class::BASE === 26 ?
+                'intval($sum / 0x4000000);' :
+                '$sum >> 31;';
+            $code .= '
+                $' . $result . '[' . $i . '] = ';
+            if ($class::BASE === 26) {
+                $code .= ' (int) (';
+            }
+            $code .= '$sum - ' . $class::BASE_FULL . ' * $subtemp';
+            if ($class::BASE === 26) {
+                $code .= ')';
+            }
+            $code .= ';
+                $' . $result . '[' . $j . '] = $subtemp;';
+        }
+
+        $code .= '$i = ' . $i . ';';
+
+        if ($j == count($known)) {
+            $code .= '
+                $sum = $' . $unknown . '[' . $i . '] - ' . $known[$i] . ' - $carry;
+                $carry = $sum < 0;
+                $' . $result . '[' . $i . '] = $carry ? $sum + ' . $class::BASE_FULL . ' : $sum;
+                ++$i;';
+        }
+
+        $code .= '
+            if ($carry) {
+                for (; !$' . $result . '[$i]; ++$i) {
+                    $' . $result . '[$i] = ' . $class::MAX_DIGIT . ';
+                }
+                --$' . $result . '[$i];
+            }';
+        $code .= self::generateInlineTrim($result);
+
+        return $code;
+    }
+
+    /**
+     * Inline Comparison
+     *
+     * If $unknown >= $known then loop
+     *
+     * @param array $known
+     * @param string $unknown
+     * @param string $subcode
+     * @return string
+     */
+    private static function generateInlineCompare(array $known, $unknown, $subcode)
+    {
+        $uniqid = uniqid();
+        $code = 'loop_' . $uniqid . ':
+            $clength = count($' . $unknown . ');
+            switch (true) {
+                case $clength < ' . count($known) . ':
+                    goto end_' . $uniqid . ';
+                case $clength > ' . count($known) . ':';
+        for ($i = count($known) - 1; $i >= 0; $i--) {
+            $code .= '
+                case $' . $unknown . '[' . $i . '] > ' . $known[$i] . ':
+                    goto subcode_' . $uniqid . ';
+                case $' . $unknown . '[' . $i . '] < ' . $known[$i] . ':
+                    goto end_' . $uniqid . ';';
+        }
+        $code .= '
+                default:
+                    // do subcode
+            }
+
+            subcode_' . $uniqid . ':' . $subcode . '
+            goto loop_' . $uniqid . ';
+
+            end_' . $uniqid . ':';
+
+        return $code;
+    }
+
+    /**
+     * Convert a float to a string
+     *
+     * If you do echo floatval(pow(2, 52)) you'll get 4.6116860184274E+18. It /can/ be displayed without a loss of
+     * precision but displayed in this way there will be precision loss, hence the need for this method.
+     *
+     * @param int|float $num
+     * @return string
+     */
+    private static function float2string($num)
+    {
+        if (!is_float($num)) {
+            return (string) $num;
+        }
+
+        if ($num < 0) {
+            return '-' . self::float2string(abs($num));
+        }
+
+        $temp = '';
+        while ($num) {
+            $temp = fmod($num, 10) . $temp;
+            $num = floor($num / 10);
+        }
+
+        return $temp;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Montgomery.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/Montgomery.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,126 @@
+<?php
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP\Montgomery as Progenitor;
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Montgomery extends Progenitor
+{
+    /**
+     * Prepare a number for use in Montgomery Modular Reductions
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    protected static function prepareReduce(array $x, array $n, $class)
+    {
+        $lhs = new $class();
+        $lhs->value = array_merge(self::array_repeat(0, count($n)), $x);
+        $rhs = new $class();
+        $rhs->value = $n;
+
+        list(, $temp) = $lhs->divide($rhs);
+        return $temp->value;
+    }
+
+    /**
+     * Montgomery Multiply
+     *
+     * Interleaves the montgomery reduction and long multiplication algorithms together as described in
+     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=13 HAC 14.36}
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    protected static function reduce(array $x, array $n, $class)
+    {
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        if (($key = array_search($n, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $x;
+            $cache[self::DATA][] = self::modInverse67108864($n, $class);
+        }
+
+        $k = count($n);
+
+        $result = [self::VALUE => $x];
+
+        for ($i = 0; $i < $k; ++$i) {
+            $temp = $result[self::VALUE][$i] * $cache[self::DATA][$key];
+            $temp = $temp - $class::BASE_FULL * ($class::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $class::regularMultiply([$temp], $n);
+            $temp = array_merge(self::array_repeat(0, $i), $temp);
+            $result = $class::addHelper($result[self::VALUE], false, $temp, false);
+        }
+
+        $result[self::VALUE] = array_slice($result[self::VALUE], $k);
+
+        if (self::compareHelper($result, false, $n, false) >= 0) {
+            $result = $class::subtractHelper($result[self::VALUE], false, $n, false);
+        }
+
+        return $result[self::VALUE];
+    }
+
+    /**
+     * Modular Inverse of a number mod 2**26 (eg. 67108864)
+     *
+     * Based off of the bnpInvDigit function implemented and justified in the following URL:
+     *
+     * {@link http://www-cs-students.stanford.edu/~tjw/jsbn/jsbn.js}
+     *
+     * The following URL provides more info:
+     *
+     * {@link http://groups.google.com/group/sci.crypt/msg/7a137205c1be7d85}
+     *
+     * As for why we do all the bitmasking...  strange things can happen when converting from floats to ints. For
+     * instance, on some computers, var_dump((int) -4294967297) yields int(-1) and on others, it yields
+     * int(-2147483648).  To avoid problems stemming from this, we use bitmasks to guarantee that ints aren't
+     * auto-converted to floats.  The outermost bitmask is present because without it, there's no guarantee that
+     * the "residue" returned would be the so-called "common residue".  We use fmod, in the last step, because the
+     * maximum possible $x is 26 bits and the maximum $result is 16 bits.  Thus, we have to be able to handle up to
+     * 40 bits, which only 64-bit floating points will support.
+     *
+     * Thanks to Pedro Gimeno Fortea for input!
+     *
+     * @param array $x
+     * @param string $class
+     * @return int
+     */
+    protected static function modInverse67108864(array $x, $class) // 2**26 == 67,108,864
+    {
+        $x = -$x[0];
+        $result = $x & 0x3; // x**-1 mod 2**2
+        $result = ($result * (2 - $x * $result)) & 0xF; // x**-1 mod 2**4
+        $result = ($result * (2 - ($x & 0xFF) * $result))  & 0xFF; // x**-1 mod 2**8
+        $result = ($result * ((2 - ($x & 0xFFFF) * $result) & 0xFFFF)) & 0xFFFF; // x**-1 mod 2**16
+        $result = $class::BASE == 26 ?
+            fmod($result * (2 - fmod($x * $result, $class::BASE_FULL)), $class::BASE_FULL) : // x**-1 mod 2**26
+            ($result * (2 - ($x * $result) % $class::BASE_FULL)) % $class::BASE_FULL;
+        return $result & $class::MAX_DIGIT;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/MontgomeryMult.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/MontgomeryMult.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/MontgomeryMult.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine with interleaved multiplication
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP;
+
+/**
+ * PHP Montgomery Modular Exponentiation Engine with interleaved multiplication
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class MontgomeryMult extends Montgomery
+{
+    /**
+     * Montgomery Multiply
+     *
+     * Interleaves the montgomery reduction and long multiplication algorithms together as described in
+     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=13 HAC 14.36}
+     *
+     * @see self::_prepMontgomery()
+     * @see self::_montgomery()
+     * @param array $x
+     * @param array $y
+     * @param array $m
+     * @param class-string<PHP> $class
+     * @return array
+     */
+    public static function multiplyReduce(array $x, array $y, array $m, $class)
+    {
+        // the following code, although not callable, can be run independently of the above code
+        // although the above code performed better in my benchmarks the following could might
+        // perform better under different circumstances. in lieu of deleting it it's just been
+        // made uncallable
+
+        static $cache = [
+            self::VARIABLE => [],
+            self::DATA => []
+        ];
+
+        if (($key = array_search($m, $cache[self::VARIABLE])) === false) {
+            $key = count($cache[self::VARIABLE]);
+            $cache[self::VARIABLE][] = $m;
+            $cache[self::DATA][] = self::modInverse67108864($m, $class);
+        }
+
+        $n = max(count($x), count($y), count($m));
+        $x = array_pad($x, $n, 0);
+        $y = array_pad($y, $n, 0);
+        $m = array_pad($m, $n, 0);
+        $a = [self::VALUE => self::array_repeat(0, $n + 1)];
+        for ($i = 0; $i < $n; ++$i) {
+            $temp = $a[self::VALUE][0] + $x[$i] * $y[0];
+            $temp = $temp - $class::BASE_FULL * ($class::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $temp * $cache[self::DATA][$key];
+            $temp = $temp - $class::BASE_FULL * ($class::BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $class::addHelper($class::regularMultiply([$x[$i]], $y), false, $class::regularMultiply([$temp], $m), false);
+            $a = $class::addHelper($a[self::VALUE], false, $temp[self::VALUE], false);
+            $a[self::VALUE] = array_slice($a[self::VALUE], 1);
+        }
+        if (self::compareHelper($a[self::VALUE], false, $m, false) >= 0) {
+            $a = $class::subtractHelper($a[self::VALUE], false, $m, false);
+        }
+        return $a[self::VALUE];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/PowerOfTwo.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/PowerOfTwo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP/Reductions/PowerOfTwo.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * PHP Power of Two Modular Exponentiation Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions;
+
+use phpseclib3\Math\BigInteger\Engines\PHP\Base;
+
+/**
+ * PHP Power Of Two Modular Exponentiation Engine
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class PowerOfTwo extends Base
+{
+    /**
+     * Prepare a number for use in Montgomery Modular Reductions
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    protected static function prepareReduce(array $x, array $n, $class)
+    {
+        return self::reduce($x, $n, $class);
+    }
+
+    /**
+     * Power Of Two Reduction
+     *
+     * @param array $x
+     * @param array $n
+     * @param string $class
+     * @return array
+     */
+    protected static function reduce(array $x, array $n, $class)
+    {
+        $lhs = new $class();
+        $lhs->value = $x;
+        $rhs = new $class();
+        $rhs->value = $n;
+
+        $temp = new $class();
+        $temp->value = [1];
+
+        $result = $lhs->bitwise_and($rhs->subtract($temp));
+        return $result->value;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP32.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP32.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP32.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,371 @@
+<?php
+
+/**
+ * Pure-PHP 32-bit BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+/**
+ * Pure-PHP 32-bit Engine.
+ *
+ * Uses 64-bit floats if int size is 4 bits
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class PHP32 extends PHP
+{
+    // Constants used by PHP.php
+    const BASE = 26;
+    const BASE_FULL = 0x4000000;
+    const MAX_DIGIT = 0x3FFFFFF;
+    const MSB = 0x2000000;
+
+    /**
+     * MAX10 in greatest MAX10LEN satisfying
+     * MAX10 = 10**MAX10LEN <= 2**BASE.
+     */
+    const MAX10 = 10000000;
+
+    /**
+     * MAX10LEN in greatest MAX10LEN satisfying
+     * MAX10 = 10**MAX10LEN <= 2**BASE.
+     */
+    const MAX10LEN = 7;
+    const MAX_DIGIT2 = 4503599627370496;
+
+    /**
+     * Initialize a PHP32 BigInteger Engine instance
+     *
+     * @param int $base
+     * @see parent::initialize()
+     */
+    protected function initialize($base)
+    {
+        if ($base != 256 && $base != -256) {
+            return parent::initialize($base);
+        }
+
+        $val = $this->value;
+        $this->value = [];
+        $vals = &$this->value;
+        $i = strlen($val);
+        if (!$i) {
+            return;
+        }
+
+        while (true) {
+            $i -= 4;
+            if ($i < 0) {
+                if ($i == -4) {
+                    break;
+                }
+                $val = substr($val, 0, 4 + $i);
+                $val = str_pad($val, 4, "\0", STR_PAD_LEFT);
+                if ($val == "\0\0\0\0") {
+                    break;
+                }
+                $i = 0;
+            }
+            list(, $digit) = unpack('N', substr($val, $i, 4));
+            if ($digit < 0) {
+                $digit += 0xFFFFFFFF + 1;
+            }
+            $step = count($vals) & 3;
+            if ($step) {
+                $digit = (int) floor($digit / pow(2, 2 * $step));
+            }
+            if ($step != 3) {
+                $digit = (int) fmod($digit, static::BASE_FULL);
+                $i++;
+            }
+            $vals[] = $digit;
+        }
+        while (end($vals) === 0) {
+            array_pop($vals);
+        }
+        reset($vals);
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see parent::__construct()
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return PHP_INT_SIZE >= 4 && !self::testJITOnWindows();
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * @param PHP32 $y
+     * @return PHP32
+     */
+    public function add(PHP32 $y)
+    {
+        $temp = self::addHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * @param PHP32 $y
+     * @return PHP32
+     */
+    public function subtract(PHP32 $y)
+    {
+        $temp = self::subtractHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Multiplies two BigIntegers.
+     *
+     * @param PHP32 $y
+     * @return PHP32
+     */
+    public function multiply(PHP32 $y)
+    {
+        $temp = self::multiplyHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * @param PHP32 $y
+     * @return array{PHP32, PHP32}
+     */
+    public function divide(PHP32 $y)
+    {
+        return $this->divideHelper($y);
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     * @param PHP32 $n
+     * @return false|PHP32
+     */
+    public function modInverse(PHP32 $n)
+    {
+        return $this->modInverseHelper($n);
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     * @param PHP32 $n
+     * @return PHP32[]
+     */
+    public function extendedGCD(PHP32 $n)
+    {
+        return $this->extendedGCDHelper($n);
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * @param PHP32 $n
+     * @return PHP32
+     */
+    public function gcd(PHP32 $n)
+    {
+        return $this->extendedGCD($n)['gcd'];
+    }
+
+    /**
+     * Logical And
+     *
+     * @param PHP32 $x
+     * @return PHP32
+     */
+    public function bitwise_and(PHP32 $x)
+    {
+        return $this->bitwiseAndHelper($x);
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param PHP32 $x
+     * @return PHP32
+     */
+    public function bitwise_or(PHP32 $x)
+    {
+        return $this->bitwiseOrHelper($x);
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param PHP32 $x
+     * @return PHP32
+     */
+    public function bitwise_xor(PHP32 $x)
+    {
+        return $this->bitwiseXorHelper($x);
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this is
+     * demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
+     *
+     * @param PHP32 $y
+     * @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @see self::equals()
+     */
+    public function compare(PHP32 $y)
+    {
+        return $this->compareHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use BigInteger::compare()
+     *
+     * @param PHP32 $x
+     * @return bool
+     */
+    public function equals(PHP32 $x)
+    {
+        return $this->value === $x->value && $this->is_negative == $x->is_negative;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param PHP32 $e
+     * @param PHP32 $n
+     * @return PHP32
+     */
+    public function modPow(PHP32 $e, PHP32 $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Alias for modPow().
+     *
+     * @param PHP32 $e
+     * @param PHP32 $n
+     * @return PHP32
+     */
+    public function powMod(PHP32 $e, PHP32 $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Generate a random prime number between a range
+     *
+     * If there's not a prime within the given range, false will be returned.
+     *
+     * @param PHP32 $min
+     * @param PHP32 $max
+     * @return false|PHP32
+     */
+    public static function randomRangePrime(PHP32 $min, PHP32 $max)
+    {
+        return self::randomRangePrimeOuter($min, $max);
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param PHP32 $min
+     * @param PHP32 $max
+     * @return PHP32
+     */
+    public static function randomRange(PHP32 $min, PHP32 $max)
+    {
+        return self::randomRangeHelper($min, $max);
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param PHP32 $n
+     * @return PHP32
+     */
+    public function pow(PHP32 $n)
+    {
+        return $this->powHelper($n);
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param PHP32 ...$nums
+     * @return PHP32
+     */
+    public static function min(PHP32 ...$nums)
+    {
+        return self::minHelper($nums);
+    }
+
+    /**
+     * Return the maximum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param PHP32 ...$nums
+     * @return PHP32
+     */
+    public static function max(PHP32 ...$nums)
+    {
+        return self::maxHelper($nums);
+    }
+
+    /**
+     * Tests BigInteger to see if it is between two integers, inclusive
+     *
+     * @param PHP32 $min
+     * @param PHP32 $max
+     * @return bool
+     */
+    public function between(PHP32 $min, PHP32 $max)
+    {
+        return $this->compare($min) >= 0 && $this->compare($max) <= 0;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP64.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP64.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BigInteger/Engines/PHP64.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,372 @@
+<?php
+
+/**
+ * Pure-PHP 64-bit BigInteger Engine
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math\BigInteger\Engines;
+
+/**
+ * Pure-PHP 64-bit Engine.
+ *
+ * Uses 64-bit integers if int size is 8 bits
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class PHP64 extends PHP
+{
+    // Constants used by PHP.php
+    const BASE = 31;
+    const BASE_FULL = 0x80000000;
+    const MAX_DIGIT = 0x7FFFFFFF;
+    const MSB = 0x40000000;
+
+    /**
+     * MAX10 in greatest MAX10LEN satisfying
+     * MAX10 = 10**MAX10LEN <= 2**BASE.
+     */
+    const MAX10 = 1000000000;
+
+    /**
+     * MAX10LEN in greatest MAX10LEN satisfying
+     * MAX10 = 10**MAX10LEN <= 2**BASE.
+     */
+    const MAX10LEN = 9;
+    const MAX_DIGIT2 = 4611686018427387904;
+
+    /**
+     * Initialize a PHP64 BigInteger Engine instance
+     *
+     * @param int $base
+     * @see parent::initialize()
+     */
+    protected function initialize($base)
+    {
+        if ($base != 256 && $base != -256) {
+            return parent::initialize($base);
+        }
+
+        $val = $this->value;
+        $this->value = [];
+        $vals = &$this->value;
+        $i = strlen($val);
+        if (!$i) {
+            return;
+        }
+
+        while (true) {
+            $i -= 4;
+            if ($i < 0) {
+                if ($i == -4) {
+                    break;
+                }
+                $val = substr($val, 0, 4 + $i);
+                $val = str_pad($val, 4, "\0", STR_PAD_LEFT);
+                if ($val == "\0\0\0\0") {
+                    break;
+                }
+                $i = 0;
+            }
+            list(, $digit) = unpack('N', substr($val, $i, 4));
+            $step = count($vals) & 7;
+            if (!$step) {
+                $digit &= static::MAX_DIGIT;
+                $i++;
+            } else {
+                $shift = 8 - $step;
+                $digit >>= $shift;
+                $shift = 32 - $shift;
+                $digit &= (1 << $shift) - 1;
+                $temp = $i > 0 ? ord($val[$i - 1]) : 0;
+                $digit |= ($temp << $shift) & 0x7F000000;
+            }
+            $vals[] = $digit;
+        }
+        while (end($vals) === 0) {
+            array_pop($vals);
+        }
+        reset($vals);
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see parent::__construct()
+     * @return bool
+     */
+    public static function isValidEngine()
+    {
+        return PHP_INT_SIZE >= 8 && !self::testJITOnWindows();
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * @param PHP64 $y
+     * @return PHP64
+     */
+    public function add(PHP64 $y)
+    {
+        $temp = self::addHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * @param PHP64 $y
+     * @return PHP64
+     */
+    public function subtract(PHP64 $y)
+    {
+        $temp = self::subtractHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Multiplies two BigIntegers.
+     *
+     * @param PHP64 $y
+     * @return PHP64
+     */
+    public function multiply(PHP64 $y)
+    {
+        $temp = self::multiplyHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        return $this->convertToObj($temp);
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * @param PHP64 $y
+     * @return array{PHP64, PHP64}
+     */
+    public function divide(PHP64 $y)
+    {
+        return $this->divideHelper($y);
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     * @param PHP64 $n
+     * @return false|PHP64
+     */
+    public function modInverse(PHP64 $n)
+    {
+        return $this->modInverseHelper($n);
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     * @param PHP64 $n
+     * @return PHP64[]
+     */
+    public function extendedGCD(PHP64 $n)
+    {
+        return $this->extendedGCDHelper($n);
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * @param PHP64 $n
+     * @return PHP64
+     */
+    public function gcd(PHP64 $n)
+    {
+        return $this->extendedGCD($n)['gcd'];
+    }
+
+    /**
+     * Logical And
+     *
+     * @param PHP64 $x
+     * @return PHP64
+     */
+    public function bitwise_and(PHP64 $x)
+    {
+        return $this->bitwiseAndHelper($x);
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param PHP64 $x
+     * @return PHP64
+     */
+    public function bitwise_or(PHP64 $x)
+    {
+        return $this->bitwiseOrHelper($x);
+    }
+
+    /**
+     * Logical Exclusive Or
+     *
+     * @param PHP64 $x
+     * @return PHP64
+     */
+    public function bitwise_xor(PHP64 $x)
+    {
+        return $this->bitwiseXorHelper($x);
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this is
+     * demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
+     *
+     * @param PHP64 $y
+     * @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @see self::equals()
+     */
+    public function compare(PHP64 $y)
+    {
+        return parent::compareHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use BigInteger::compare()
+     *
+     * @param PHP64 $x
+     * @return bool
+     */
+    public function equals(PHP64 $x)
+    {
+        return $this->value === $x->value && $this->is_negative == $x->is_negative;
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * @param PHP64 $e
+     * @param PHP64 $n
+     * @return PHP64
+     */
+    public function modPow(PHP64 $e, PHP64 $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Alias for modPow().
+     *
+     * @param PHP64 $e
+     * @param PHP64 $n
+     * @return PHP64|false
+     */
+    public function powMod(PHP64 $e, PHP64 $n)
+    {
+        return $this->powModOuter($e, $n);
+    }
+
+    /**
+     * Generate a random prime number between a range
+     *
+     * If there's not a prime within the given range, false will be returned.
+     *
+     * @param PHP64 $min
+     * @param PHP64 $max
+     * @return false|PHP64
+     */
+    public static function randomRangePrime(PHP64 $min, PHP64 $max)
+    {
+        return self::randomRangePrimeOuter($min, $max);
+    }
+
+    /**
+     * Generate a random number between a range
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * BigInteger::randomRange($min, $max)
+     * BigInteger::randomRange($max, $min)
+     *
+     * @param PHP64 $min
+     * @param PHP64 $max
+     * @return PHP64
+     */
+    public static function randomRange(PHP64 $min, PHP64 $max)
+    {
+        return self::randomRangeHelper($min, $max);
+    }
+
+    /**
+     * Performs exponentiation.
+     *
+     * @param PHP64 $n
+     * @return PHP64
+     */
+    public function pow(PHP64 $n)
+    {
+        return $this->powHelper($n);
+    }
+
+    /**
+     * Return the minimum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param PHP64 ...$nums
+     * @return PHP64
+     */
+    public static function min(PHP64 ...$nums)
+    {
+        return self::minHelper($nums);
+    }
+
+    /**
+     * Return the maximum BigInteger between an arbitrary number of BigIntegers.
+     *
+     * @param PHP64 ...$nums
+     * @return PHP64
+     */
+    public static function max(PHP64 ...$nums)
+    {
+        return self::maxHelper($nums);
+    }
+
+    /**
+     * Tests BigInteger to see if it is between two integers, inclusive
+     *
+     * @param PHP64 $min
+     * @param PHP64 $max
+     * @return bool
+     */
+    public function between(PHP64 $min, PHP64 $max)
+    {
+        return $this->compare($min) >= 0 && $this->compare($max) <= 0;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,203 @@
+<?php
+
+/**
+ * Binary Finite Fields
+ *
+ * Utilizes the factory design pattern
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BinaryField\Integer;
+use phpseclib3\Math\Common\FiniteField;
+
+/**
+ * Binary Finite Fields
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class BinaryField extends FiniteField
+{
+    /**
+     * Instance Counter
+     *
+     * @var int
+     */
+    private static $instanceCounter = 0;
+
+    /**
+     * Keeps track of current instance
+     *
+     * @var int
+     */
+    protected $instanceID;
+
+    /** @var BigInteger */
+    private $randomMax;
+
+    /**
+     * Default constructor
+     */
+    public function __construct(...$indices)
+    {
+        $m = array_shift($indices);
+        if ($m > 571) {
+            /* sect571r1 and sect571k1 are the largest binary curves that https://www.secg.org/sec2-v2.pdf defines
+               altho theoretically there may be legit reasons to use binary finite fields with larger degrees
+               imposing a limit on the maximum size is both reasonable and precedented. in particular,
+               http://tools.ietf.org/html/rfc4253#section-6.1 (The Secure Shell (SSH) Transport Layer Protocol) says
+               "implementations SHOULD check that the packet length is reasonable in order for the implementation to
+                avoid denial of service and/or buffer overflow attacks" */
+            throw new \OutOfBoundsException('Degrees larger than 571 are not supported');
+        }
+        $val = str_repeat('0', $m) . '1';
+        foreach ($indices as $index) {
+            $val[$index] = '1';
+        }
+        $modulo = static::base2ToBase256(strrev($val));
+
+        $mStart = 2 * $m - 2;
+        $t = ceil($m / 8);
+        $finalMask = chr((1 << ($m % 8)) - 1);
+        if ($finalMask == "\0") {
+            $finalMask = "\xFF";
+        }
+        $bitLen = $mStart + 1;
+        $pad = ceil($bitLen / 8);
+        $h = $bitLen & 7;
+        $h = $h ? 8 - $h : 0;
+
+        $r = rtrim(substr($val, 0, -1), '0');
+        $u = [static::base2ToBase256(strrev($r))];
+        for ($i = 1; $i < 8; $i++) {
+            $u[] = static::base2ToBase256(strrev(str_repeat('0', $i) . $r));
+        }
+
+        // implements algorithm 2.40 (in section 2.3.5) in "Guide to Elliptic Curve Cryptography"
+        // with W = 8
+        $reduce = function ($c) use ($u, $mStart, $m, $t, $finalMask, $pad, $h) {
+            $c = str_pad($c, $pad, "\0", STR_PAD_LEFT);
+            for ($i = $mStart; $i >= $m;) {
+                $g = $h >> 3;
+                $mask = $h & 7;
+                $mask = $mask ? 1 << (7 - $mask) : 0x80;
+                for (; $mask > 0; $mask >>= 1, $i--, $h++) {
+                    if (ord($c[$g]) & $mask) {
+                        $temp = $i - $m;
+                        $j = $temp >> 3;
+                        $k = $temp & 7;
+                        $t1 = $j ? substr($c, 0, -$j) : $c;
+                        $length = strlen($t1);
+                        if ($length) {
+                            $t2 = str_pad($u[$k], $length, "\0", STR_PAD_LEFT);
+                            $temp = $t1 ^ $t2;
+                            $c = $j ? substr_replace($c, $temp, 0, $length) : $temp;
+                        }
+                    }
+                }
+            }
+            $c = substr($c, -$t);
+            if (strlen($c) == $t) {
+                $c[0] = $c[0] & $finalMask;
+            }
+            return ltrim($c, "\0");
+        };
+
+        $this->instanceID = self::$instanceCounter++;
+        Integer::setModulo($this->instanceID, $modulo);
+        Integer::setRecurringModuloFunction($this->instanceID, $reduce);
+
+        $this->randomMax = new BigInteger($modulo, 2);
+    }
+
+    /**
+     * Returns an instance of a dynamically generated PrimeFieldInteger class
+     *
+     * @param string $num
+     * @return Integer
+     */
+    public function newInteger($num)
+    {
+        return new Integer($this->instanceID, $num instanceof BigInteger ? $num->toBytes() : $num);
+    }
+
+    /**
+     * Returns an integer on the finite field between one and the prime modulo
+     *
+     * @return Integer
+     */
+    public function randomInteger()
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        return new Integer($this->instanceID, BigInteger::randomRange($one, $this->randomMax)->toBytes());
+    }
+
+    /**
+     * Returns the length of the modulo in bytes
+     *
+     * @return int
+     */
+    public function getLengthInBytes()
+    {
+        return strlen(Integer::getModulo($this->instanceID));
+    }
+
+    /**
+     * Returns the length of the modulo in bits
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return strlen(Integer::getModulo($this->instanceID)) << 3;
+    }
+
+    /**
+     * Converts a base-2 string to a base-256 string
+     *
+     * @param string $x
+     * @param int|null $size
+     * @return string
+     */
+    public static function base2ToBase256($x, $size = null)
+    {
+        $str = Strings::bits2bin($x);
+
+        $pad = strlen($x) >> 3;
+        if (strlen($x) & 3) {
+            $pad++;
+        }
+        $str = str_pad($str, $pad, "\0", STR_PAD_LEFT);
+        if (isset($size)) {
+            $str = str_pad($str, $size, "\0", STR_PAD_LEFT);
+        }
+
+        return $str;
+    }
+
+    /**
+     * Converts a base-256 string to a base-2 string
+     *
+     * @param string $x
+     * @return string
+     */
+    public static function base256ToBase2($x)
+    {
+        if (function_exists('gmp_import')) {
+            return gmp_strval(gmp_import($x), 2);
+        }
+
+        return Strings::bin2bits($x);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField/Integer.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/BinaryField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,516 @@
+<?php
+
+/**
+ * Binary Finite Fields
+ *
+ * In a binary finite field numbers are actually polynomial equations. If you
+ * represent the number as a sequence of bits you get a sequence of 1's or 0's.
+ * These 1's or 0's represent the coefficients of the x**n, where n is the
+ * location of the given bit. When you add numbers over a binary finite field
+ * the result should have a coefficient of 1 or 0 as well. Hence addition
+ * and subtraction become the same operation as XOR.
+ * eg. 1 + 1 + 1 == 3 % 2 == 1 or 0 - 1 == -1 % 2 == 1
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math\BinaryField;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\BinaryField;
+use phpseclib3\Math\Common\FiniteField\Integer as Base;
+
+/**
+ * Binary Finite Fields
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Integer extends Base
+{
+    /**
+     * Holds the BinaryField's value
+     *
+     * @var string
+     */
+    protected $value;
+
+    /**
+     * Keeps track of current instance
+     *
+     * @var int
+     */
+    protected $instanceID;
+
+    /**
+     * Holds the PrimeField's modulo
+     *
+     * @var array<int, string>
+     */
+    protected static $modulo;
+
+    /**
+     * Holds a pre-generated function to perform modulo reductions
+     *
+     * @var callable[]
+     */
+    protected static $reduce;
+
+    /**
+     * Default constructor
+     */
+    public function __construct($instanceID, $num = '')
+    {
+        $this->instanceID = $instanceID;
+        if (!strlen($num)) {
+            $this->value = '';
+        } else {
+            $reduce = static::$reduce[$instanceID];
+            $this->value = $reduce($num);
+        }
+    }
+
+    /**
+     * Set the modulo for a given instance
+     * @param int $instanceID
+     * @param string $modulo
+     */
+    public static function setModulo($instanceID, $modulo)
+    {
+        static::$modulo[$instanceID] = $modulo;
+    }
+
+    /**
+     * Set the modulo for a given instance
+     */
+    public static function setRecurringModuloFunction($instanceID, callable $function)
+    {
+        static::$reduce[$instanceID] = $function;
+    }
+
+    /**
+     * Tests a parameter to see if it's of the right instance
+     *
+     * Throws an exception if the incorrect class is being utilized
+     */
+    private static function checkInstance(self $x, self $y)
+    {
+        if ($x->instanceID != $y->instanceID) {
+            throw new \UnexpectedValueException('The instances of the two BinaryField\Integer objects do not match');
+        }
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * @return bool
+     */
+    public function equals(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        return $this->value == $x->value;
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * @return int
+     */
+    public function compare(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        $a = $this->value;
+        $b = $x->value;
+
+        $length = max(strlen($a), strlen($b));
+
+        $a = str_pad($a, $length, "\0", STR_PAD_LEFT);
+        $b = str_pad($b, $length, "\0", STR_PAD_LEFT);
+
+        return strcmp($a, $b);
+    }
+
+    /**
+     * Returns the degree of the polynomial
+     *
+     * @param string $x
+     * @return int
+     */
+    private static function deg($x)
+    {
+        $x = ltrim($x, "\0");
+        $xbit = decbin(ord($x[0]));
+        $xlen = $xbit == '0' ? 0 : strlen($xbit);
+        $len = strlen($x);
+        if (!$len) {
+            return -1;
+        }
+        return 8 * strlen($x) - 9 + $xlen;
+    }
+
+    /**
+     * Perform polynomial division
+     *
+     * @return string[]
+     * @link https://en.wikipedia.org/wiki/Polynomial_greatest_common_divisor#Euclidean_division
+     */
+    private static function polynomialDivide($x, $y)
+    {
+        // in wikipedia's description of the algorithm, lc() is the leading coefficient. over a binary field that's
+        // always going to be 1.
+
+        $q = chr(0);
+        $d = static::deg($y);
+        $r = $x;
+        while (($degr = static::deg($r)) >= $d) {
+            $s = '1' . str_repeat('0', $degr - $d);
+            $s = BinaryField::base2ToBase256($s);
+            $length = max(strlen($s), strlen($q));
+            $q = !isset($q) ? $s :
+                str_pad($q, $length, "\0", STR_PAD_LEFT) ^
+                str_pad($s, $length, "\0", STR_PAD_LEFT);
+            $s = static::polynomialMultiply($s, $y);
+            $length = max(strlen($r), strlen($s));
+            $r = str_pad($r, $length, "\0", STR_PAD_LEFT) ^
+                 str_pad($s, $length, "\0", STR_PAD_LEFT);
+        }
+
+        return [ltrim($q, "\0"), ltrim($r, "\0")];
+    }
+
+    /**
+     * Perform polynomial multiplation in the traditional way
+     *
+     * @return string
+     * @link https://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplication
+     */
+    private static function regularPolynomialMultiply($x, $y)
+    {
+        $precomputed = [ltrim($x, "\0")];
+        $x = strrev(BinaryField::base256ToBase2($x));
+        $y = strrev(BinaryField::base256ToBase2($y));
+        if (strlen($x) == strlen($y)) {
+            $length = strlen($x);
+        } else {
+            $length = max(strlen($x), strlen($y));
+            $x = str_pad($x, $length, '0');
+            $y = str_pad($y, $length, '0');
+        }
+        $result = str_repeat('0', 2 * $length - 1);
+        $result = BinaryField::base2ToBase256($result);
+        $size = strlen($result);
+        $x = strrev($x);
+
+        // precompute left shift 1 through 7
+        for ($i = 1; $i < 8; $i++) {
+            $precomputed[$i] = BinaryField::base2ToBase256($x . str_repeat('0', $i));
+        }
+        for ($i = 0; $i < strlen($y); $i++) {
+            if ($y[$i] == '1') {
+                $temp = $precomputed[$i & 7] . str_repeat("\0", $i >> 3);
+                $result ^= str_pad($temp, $size, "\0", STR_PAD_LEFT);
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Perform polynomial multiplation
+     *
+     * Uses karatsuba multiplication to reduce x-bit multiplications to a series of 32-bit multiplications
+     *
+     * @return string
+     * @link https://en.wikipedia.org/wiki/Karatsuba_algorithm
+     */
+    private static function polynomialMultiply($x, $y)
+    {
+        if (strlen($x) == strlen($y)) {
+            $length = strlen($x);
+        } else {
+            $length = max(strlen($x), strlen($y));
+            $x = str_pad($x, $length, "\0", STR_PAD_LEFT);
+            $y = str_pad($y, $length, "\0", STR_PAD_LEFT);
+        }
+
+        switch (true) {
+            case PHP_INT_SIZE == 8 && $length <= 4:
+                return $length != 4 ?
+                    self::subMultiply(str_pad($x, 4, "\0", STR_PAD_LEFT), str_pad($y, 4, "\0", STR_PAD_LEFT)) :
+                    self::subMultiply($x, $y);
+            case PHP_INT_SIZE == 4 || $length > 32:
+                return self::regularPolynomialMultiply($x, $y);
+        }
+
+        $m = $length >> 1;
+
+        $x1 = substr($x, 0, -$m);
+        $x0 = substr($x, -$m);
+        $y1 = substr($y, 0, -$m);
+        $y0 = substr($y, -$m);
+
+        $z2 = self::polynomialMultiply($x1, $y1);
+        $z0 = self::polynomialMultiply($x0, $y0);
+        $z1 = self::polynomialMultiply(
+            self::subAdd2($x1, $x0),
+            self::subAdd2($y1, $y0)
+        );
+
+        $z1 = self::subAdd3($z1, $z2, $z0);
+
+        $xy = self::subAdd3(
+            $z2 . str_repeat("\0", 2 * $m),
+            $z1 . str_repeat("\0", $m),
+            $z0
+        );
+
+        return ltrim($xy, "\0");
+    }
+
+    /**
+     * Perform polynomial multiplication on 2x 32-bit numbers, returning
+     * a 64-bit number
+     *
+     * @param string $x
+     * @param string $y
+     * @return string
+     * @link https://www.bearssl.org/constanttime.html#ghash-for-gcm
+     */
+    private static function subMultiply($x, $y)
+    {
+        $x = unpack('N', $x)[1];
+        $y = unpack('N', $y)[1];
+
+        $x0 = $x & 0x11111111;
+        $x1 = $x & 0x22222222;
+        $x2 = $x & 0x44444444;
+        $x3 = $x & 0x88888888;
+
+        $y0 = $y & 0x11111111;
+        $y1 = $y & 0x22222222;
+        $y2 = $y & 0x44444444;
+        $y3 = $y & 0x88888888;
+
+        $z0 = ($x0 * $y0) ^ ($x1 * $y3) ^ ($x2 * $y2) ^ ($x3 * $y1);
+        $z1 = ($x0 * $y1) ^ ($x1 * $y0) ^ ($x2 * $y3) ^ ($x3 * $y2);
+        $z2 = ($x0 * $y2) ^ ($x1 * $y1) ^ ($x2 * $y0) ^ ($x3 * $y3);
+        $z3 = ($x0 * $y3) ^ ($x1 * $y2) ^ ($x2 * $y1) ^ ($x3 * $y0);
+
+        $z0 &= 0x1111111111111111;
+        $z1 &= 0x2222222222222222;
+        $z2 &= 0x4444444444444444;
+        $z3 &= -8608480567731124088; // 0x8888888888888888 gets interpreted as a float
+
+        $z = $z0 | $z1 | $z2 | $z3;
+
+        return pack('J', $z);
+    }
+
+    /**
+     * Adds two numbers
+     *
+     * @param string $x
+     * @param string $y
+     * @return string
+     */
+    private static function subAdd2($x, $y)
+    {
+        $length = max(strlen($x), strlen($y));
+        $x = str_pad($x, $length, "\0", STR_PAD_LEFT);
+        $y = str_pad($y, $length, "\0", STR_PAD_LEFT);
+        return $x ^ $y;
+    }
+
+    /**
+     * Adds three numbers
+     *
+     * @param string $x
+     * @param string $y
+     * @return string
+     */
+    private static function subAdd3($x, $y, $z)
+    {
+        $length = max(strlen($x), strlen($y), strlen($z));
+        $x = str_pad($x, $length, "\0", STR_PAD_LEFT);
+        $y = str_pad($y, $length, "\0", STR_PAD_LEFT);
+        $z = str_pad($z, $length, "\0", STR_PAD_LEFT);
+        return $x ^ $y ^ $z;
+    }
+
+    /**
+     * Adds two BinaryFieldIntegers.
+     *
+     * @return static
+     */
+    public function add(self $y)
+    {
+        static::checkInstance($this, $y);
+
+        $length = strlen(static::$modulo[$this->instanceID]);
+
+        $x = str_pad($this->value, $length, "\0", STR_PAD_LEFT);
+        $y = str_pad($y->value, $length, "\0", STR_PAD_LEFT);
+
+        return new static($this->instanceID, $x ^ $y);
+    }
+
+    /**
+     * Subtracts two BinaryFieldIntegers.
+     *
+     * @return static
+     */
+    public function subtract(self $x)
+    {
+        return $this->add($x);
+    }
+
+    /**
+     * Multiplies two BinaryFieldIntegers.
+     *
+     * @return static
+     */
+    public function multiply(self $y)
+    {
+        static::checkInstance($this, $y);
+
+        return new static($this->instanceID, static::polynomialMultiply($this->value, $y->value));
+    }
+
+    /**
+     * Returns the modular inverse of a BinaryFieldInteger
+     *
+     * @return static
+     */
+    public function modInverse()
+    {
+        $remainder0 = static::$modulo[$this->instanceID];
+        $remainder1 = $this->value;
+
+        if ($remainder1 == '') {
+            return new static($this->instanceID);
+        }
+
+        $aux0 = "\0";
+        $aux1 = "\1";
+        while ($remainder1 != "\1") {
+            list($q, $r) = static::polynomialDivide($remainder0, $remainder1);
+            $remainder0 = $remainder1;
+            $remainder1 = $r;
+            // the auxiliary in row n is given by the sum of the auxiliary in
+            // row n-2 and the product of the quotient and the auxiliary in row
+            // n-1
+            $temp = static::polynomialMultiply($aux1, $q);
+            $aux = str_pad($aux0, strlen($temp), "\0", STR_PAD_LEFT) ^
+                   str_pad($temp, strlen($aux0), "\0", STR_PAD_LEFT);
+            $aux0 = $aux1;
+            $aux1 = $aux;
+        }
+
+        $temp = new static($this->instanceID);
+        $temp->value = ltrim($aux1, "\0");
+        return $temp;
+    }
+
+    /**
+     * Divides two PrimeFieldIntegers.
+     *
+     * @return static
+     */
+    public function divide(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        $x = $x->modInverse();
+        return $this->multiply($x);
+    }
+
+    /**
+     * Negate
+     *
+     * A negative number can be written as 0-12. With modulos, 0 is the same thing as the modulo
+     * so 0-12 is the same thing as modulo-12
+     *
+     * @return object
+     */
+    public function negate()
+    {
+        $x = str_pad($this->value, strlen(static::$modulo[$this->instanceID]), "\0", STR_PAD_LEFT);
+
+        return new static($this->instanceID, $x ^ static::$modulo[$this->instanceID]);
+    }
+
+    /**
+     * Returns the modulo
+     *
+     * @return string
+     */
+    public static function getModulo($instanceID)
+    {
+        return static::$modulo[$instanceID];
+    }
+
+    /**
+     * Converts an Integer to a byte string (eg. base-256).
+     *
+     * @return string
+     */
+    public function toBytes()
+    {
+        return str_pad($this->value, strlen(static::$modulo[$this->instanceID]), "\0", STR_PAD_LEFT);
+    }
+
+    /**
+     * Converts an Integer to a hex string (eg. base-16).
+     *
+     * @return string
+     */
+    public function toHex()
+    {
+        return Strings::bin2hex($this->toBytes());
+    }
+
+    /**
+     * Converts an Integer to a bit string (eg. base-2).
+     *
+     * @return string
+     */
+    public function toBits()
+    {
+        //return str_pad(BinaryField::base256ToBase2($this->value), strlen(static::$modulo[$this->instanceID]), '0', STR_PAD_LEFT);
+        return BinaryField::base256ToBase2($this->value);
+    }
+
+    /**
+     * Converts an Integer to a BigInteger
+     *
+     * @return string
+     */
+    public function toBigInteger()
+    {
+        return new BigInteger($this->value, 256);
+    }
+
+    /**
+     *  __toString() magic method
+     *
+     */
+    public function __toString()
+    {
+        return (string) $this->toBigInteger();
+    }
+
+    /**
+     *  __debugInfo() magic method
+     *
+     */
+    public function __debugInfo()
+    {
+        return ['value' => $this->toHex()];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Finite Fields Base Class
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math\Common;
+
+/**
+ * Finite Fields
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class FiniteField
+{
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField/Integer.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/Common/FiniteField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Finite Field Integer Base Class
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math\Common\FiniteField;
+
+/**
+ * Finite Field Integer
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+abstract class Integer implements \JsonSerializable
+{
+    /**
+     * JSON Serialize
+     *
+     * Will be called, automatically, when json_encode() is called on a BigInteger object.
+     *
+     * PHP Serialize isn't supported because unserializing would require the factory be
+     * serialized as well and that just sounds like too much
+     *
+     * @return array{hex: string}
+     */
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize()
+    {
+        return ['hex' => $this->toHex(true)];
+    }
+
+    /**
+     * Converts an Integer to a hex string (eg. base-16).
+     *
+     * @return string
+     */
+    abstract public function toHex();
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * Prime Finite Fields
+ *
+ * Utilizes the factory design pattern
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://pear.php.net/package/Math_BigInteger
+ */
+
+namespace phpseclib3\Math;
+
+use phpseclib3\Math\Common\FiniteField;
+use phpseclib3\Math\PrimeField\Integer;
+
+/**
+ * Prime Finite Fields
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class PrimeField extends FiniteField
+{
+    /**
+     * Instance Counter
+     *
+     * @var int
+     */
+    private static $instanceCounter = 0;
+
+    /**
+     * Keeps track of current instance
+     *
+     * @var int
+     */
+    protected $instanceID;
+
+    /**
+     * Default constructor
+     */
+    public function __construct(BigInteger $modulo)
+    {
+        if (!$modulo->isPrime()) {
+            throw new \UnexpectedValueException('PrimeField requires a prime number be passed to the constructor');
+        }
+
+        $this->instanceID = self::$instanceCounter++;
+        Integer::setModulo($this->instanceID, $modulo);
+        Integer::setRecurringModuloFunction($this->instanceID, $modulo->createRecurringModuloFunction());
+    }
+
+    /**
+     * Use a custom defined modular reduction function
+     *
+     * @return void
+     */
+    public function setReduction(\Closure $func)
+    {
+        $this->reduce = $func->bindTo($this, $this);
+    }
+
+    /**
+     * Returns an instance of a dynamically generated PrimeFieldInteger class
+     *
+     * @return Integer
+     */
+    public function newInteger(BigInteger $num)
+    {
+        return new Integer($this->instanceID, $num);
+    }
+
+    /**
+     * Returns an integer on the finite field between one and the prime modulo
+     *
+     * @return Integer
+     */
+    public function randomInteger()
+    {
+        static $one;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+        }
+
+        return new Integer($this->instanceID, BigInteger::randomRange($one, Integer::getModulo($this->instanceID)));
+    }
+
+    /**
+     * Returns the length of the modulo in bytes
+     *
+     * @return int
+     */
+    public function getLengthInBytes()
+    {
+        return Integer::getModulo($this->instanceID)->getLengthInBytes();
+    }
+
+    /**
+     * Returns the length of the modulo in bits
+     *
+     * @return int
+     */
+    public function getLength()
+    {
+        return Integer::getModulo($this->instanceID)->getLength();
+    }
+
+    /**
+     *  Destructor
+     */
+    public function __destruct()
+    {
+        Integer::cleanupCache($this->instanceID);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField/Integer.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Math/PrimeField/Integer.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,419 @@
+<?php
+
+/**
+ * Prime Finite Fields
+ *
+ * PHP version 5 and 7
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2017 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+namespace phpseclib3\Math\PrimeField;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\Math\Common\FiniteField\Integer as Base;
+
+/**
+ * Prime Finite Fields
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Integer extends Base
+{
+    /**
+     * Holds the PrimeField's value
+     *
+     * @var BigInteger
+     */
+    protected $value;
+
+    /**
+     * Keeps track of current instance
+     *
+     * @var int
+     */
+    protected $instanceID;
+
+    /**
+     * Holds the PrimeField's modulo
+     *
+     * @var array<int, BigInteger>
+     */
+    protected static $modulo;
+
+    /**
+     * Holds a pre-generated function to perform modulo reductions
+     *
+     * @var array<int, callable(BigInteger):BigInteger>
+     */
+    protected static $reduce;
+
+    /**
+     * Zero
+     *
+     * @var BigInteger
+     */
+    protected static $zero;
+
+    /**
+     * Default constructor
+     *
+     * @param int $instanceID
+     */
+    public function __construct($instanceID, BigInteger $num = null)
+    {
+        $this->instanceID = $instanceID;
+        if (!isset($num)) {
+            $this->value = clone static::$zero[static::class];
+        } else {
+            $reduce = static::$reduce[$instanceID];
+            $this->value = $reduce($num);
+        }
+    }
+
+    /**
+     * Set the modulo for a given instance
+     *
+     * @param int $instanceID
+     * @return void
+     */
+    public static function setModulo($instanceID, BigInteger $modulo)
+    {
+        static::$modulo[$instanceID] = $modulo;
+    }
+
+    /**
+     * Set the modulo for a given instance
+     *
+     * @param int $instanceID
+     * @return void
+     */
+    public static function setRecurringModuloFunction($instanceID, callable $function)
+    {
+        static::$reduce[$instanceID] = $function;
+        if (!isset(static::$zero[static::class])) {
+            static::$zero[static::class] = new BigInteger();
+        }
+    }
+
+    /**
+     * Delete the modulo for a given instance
+     */
+    public static function cleanupCache($instanceID)
+    {
+        unset(static::$modulo[$instanceID]);
+        unset(static::$reduce[$instanceID]);
+    }
+
+    /**
+     * Returns the modulo
+     *
+     * @param int $instanceID
+     * @return BigInteger
+     */
+    public static function getModulo($instanceID)
+    {
+        return static::$modulo[$instanceID];
+    }
+
+    /**
+     * Tests a parameter to see if it's of the right instance
+     *
+     * Throws an exception if the incorrect class is being utilized
+     *
+     * @return void
+     */
+    public static function checkInstance(self $x, self $y)
+    {
+        if ($x->instanceID != $y->instanceID) {
+            throw new \UnexpectedValueException('The instances of the two PrimeField\Integer objects do not match');
+        }
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * @return bool
+     */
+    public function equals(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        return $this->value->equals($x->value);
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * @return int
+     */
+    public function compare(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        return $this->value->compare($x->value);
+    }
+
+    /**
+     * Adds two PrimeFieldIntegers.
+     *
+     * @return static
+     */
+    public function add(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        $temp = new static($this->instanceID);
+        $temp->value = $this->value->add($x->value);
+        if ($temp->value->compare(static::$modulo[$this->instanceID]) >= 0) {
+            $temp->value = $temp->value->subtract(static::$modulo[$this->instanceID]);
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Subtracts two PrimeFieldIntegers.
+     *
+     * @return static
+     */
+    public function subtract(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        $temp = new static($this->instanceID);
+        $temp->value = $this->value->subtract($x->value);
+        if ($temp->value->isNegative()) {
+            $temp->value = $temp->value->add(static::$modulo[$this->instanceID]);
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Multiplies two PrimeFieldIntegers.
+     *
+     * @return static
+     */
+    public function multiply(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        return new static($this->instanceID, $this->value->multiply($x->value));
+    }
+
+    /**
+     * Divides two PrimeFieldIntegers.
+     *
+     * @return static
+     */
+    public function divide(self $x)
+    {
+        static::checkInstance($this, $x);
+
+        $denominator = $x->value->modInverse(static::$modulo[$this->instanceID]);
+        return new static($this->instanceID, $this->value->multiply($denominator));
+    }
+
+    /**
+     * Performs power operation on a PrimeFieldInteger.
+     *
+     * @return static
+     */
+    public function pow(BigInteger $x)
+    {
+        $temp = new static($this->instanceID);
+        $temp->value = $this->value->powMod($x, static::$modulo[$this->instanceID]);
+
+        return $temp;
+    }
+
+    /**
+     * Calculates the square root
+     *
+     * @link https://en.wikipedia.org/wiki/Tonelli%E2%80%93Shanks_algorithm
+     * @return static|false
+     */
+    public function squareRoot()
+    {
+        static $one, $two;
+        if (!isset($one)) {
+            $one = new BigInteger(1);
+            $two = new BigInteger(2);
+        }
+        $reduce = static::$reduce[$this->instanceID];
+        $p_1 = static::$modulo[$this->instanceID]->subtract($one);
+        $q = clone $p_1;
+        $s = BigInteger::scan1divide($q);
+        list($pow) = $p_1->divide($two);
+        for ($z = $one; !$z->equals(static::$modulo[$this->instanceID]); $z = $z->add($one)) {
+            $temp = $z->powMod($pow, static::$modulo[$this->instanceID]);
+            if ($temp->equals($p_1)) {
+                break;
+            }
+        }
+
+        $m = new BigInteger($s);
+        $c = $z->powMod($q, static::$modulo[$this->instanceID]);
+        $t = $this->value->powMod($q, static::$modulo[$this->instanceID]);
+        list($temp) = $q->add($one)->divide($two);
+        $r = $this->value->powMod($temp, static::$modulo[$this->instanceID]);
+
+        while (!$t->equals($one)) {
+            for ($i = clone $one; $i->compare($m) < 0; $i = $i->add($one)) {
+                if ($t->powMod($two->pow($i), static::$modulo[$this->instanceID])->equals($one)) {
+                    break;
+                }
+            }
+
+            if ($i->compare($m) == 0) {
+                return false;
+            }
+            $b = $c->powMod($two->pow($m->subtract($i)->subtract($one)), static::$modulo[$this->instanceID]);
+            $m = $i;
+            $c = $reduce($b->multiply($b));
+            $t = $reduce($t->multiply($c));
+            $r = $reduce($r->multiply($b));
+        }
+
+        return new static($this->instanceID, $r);
+    }
+
+    /**
+     * Is Odd?
+     *
+     * @return bool
+     */
+    public function isOdd()
+    {
+        return $this->value->isOdd();
+    }
+
+    /**
+     * Negate
+     *
+     * A negative number can be written as 0-12. With modulos, 0 is the same thing as the modulo
+     * so 0-12 is the same thing as modulo-12
+     *
+     * @return static
+     */
+    public function negate()
+    {
+        return new static($this->instanceID, static::$modulo[$this->instanceID]->subtract($this->value));
+    }
+
+    /**
+     * Converts an Integer to a byte string (eg. base-256).
+     *
+     * @return string
+     */
+    public function toBytes()
+    {
+        if (isset(static::$modulo[$this->instanceID])) {
+            $length = static::$modulo[$this->instanceID]->getLengthInBytes();
+            return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
+        }
+        return $this->value->toBytes();
+    }
+
+    /**
+     * Converts an Integer to a hex string (eg. base-16).
+     *
+     * @return string
+     */
+    public function toHex()
+    {
+        return Strings::bin2hex($this->toBytes());
+    }
+
+    /**
+     * Converts an Integer to a bit string (eg. base-2).
+     *
+     * @return string
+     */
+    public function toBits()
+    {
+        // return $this->value->toBits();
+        static $length;
+        if (!isset($length)) {
+            $length = static::$modulo[$this->instanceID]->getLength();
+        }
+
+        return str_pad($this->value->toBits(), $length, '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * Returns the w-ary non-adjacent form (wNAF)
+     *
+     * @param int $w optional
+     * @return array<int, int>
+     */
+    public function getNAF($w = 1)
+    {
+        $w++;
+
+        $mask = new BigInteger((1 << $w) - 1);
+        $sub = new BigInteger(1 << $w);
+        //$sub = new BigInteger(1 << ($w - 1));
+        $d = $this->toBigInteger();
+        $d_i = [];
+
+        $i = 0;
+        while ($d->compare(static::$zero[static::class]) > 0) {
+            if ($d->isOdd()) {
+                // start mods
+
+                $bigInteger = $d->testBit($w - 1) ?
+                    $d->bitwise_and($mask)->subtract($sub) :
+                    //$sub->subtract($d->bitwise_and($mask)) :
+                    $d->bitwise_and($mask);
+                // end mods
+                $d = $d->subtract($bigInteger);
+                $d_i[$i] = (int) $bigInteger->toString();
+            } else {
+                $d_i[$i] = 0;
+            }
+            $shift = !$d->equals(static::$zero[static::class]) && $d->bitwise_and($mask)->equals(static::$zero[static::class]) ? $w : 1; // $w or $w + 1?
+            $d = $d->bitwise_rightShift($shift);
+            while (--$shift > 0) {
+                $d_i[++$i] = 0;
+            }
+            $i++;
+        }
+
+        return $d_i;
+    }
+
+    /**
+     * Converts an Integer to a BigInteger
+     *
+     * @return BigInteger
+     */
+    public function toBigInteger()
+    {
+        return clone $this->value;
+    }
+
+    /**
+     *  __toString() magic method
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return (string) $this->value;
+    }
+
+    /**
+     *  __debugInfo() magic method
+     *
+     * @return array
+     */
+    public function __debugInfo()
+    {
+        return ['value' => $this->toHex()];
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Net/SFTP.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Net/SFTP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Net/SFTP.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,3695 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SFTP.
+ *
+ * PHP version 5
+ *
+ * Supports SFTPv2/3/4/5/6. Defaults to v3.
+ *
+ * The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $sftp = new \phpseclib3\Net\SFTP('www.domain.tld');
+ *    if (!$sftp->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $sftp->pwd() . "\r\n";
+ *    $sftp->put('filename.ext', 'hello, world!');
+ *    print_r($sftp->nlist());
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Net;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\FileNotFoundException;
+
+/**
+ * Pure-PHP implementations of SFTP.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class SFTP extends SSH2
+{
+    /**
+     * SFTP channel constant
+     *
+     * \phpseclib3\Net\SSH2::exec() uses 0 and \phpseclib3\Net\SSH2::read() / \phpseclib3\Net\SSH2::write() use 1.
+     *
+     * @see \phpseclib3\Net\SSH2::send_channel_packet()
+     * @see \phpseclib3\Net\SSH2::get_channel_packet()
+     */
+    const CHANNEL = 0x100;
+
+    /**
+     * Reads data from a local file.
+     *
+     * @see \phpseclib3\Net\SFTP::put()
+     */
+    const SOURCE_LOCAL_FILE = 1;
+    /**
+     * Reads data from a string.
+     *
+     * @see \phpseclib3\Net\SFTP::put()
+     */
+    // this value isn't really used anymore but i'm keeping it reserved for historical reasons
+    const SOURCE_STRING = 2;
+    /**
+     * Reads data from callback:
+     * function callback($length) returns string to proceed, null for EOF
+     *
+     * @see \phpseclib3\Net\SFTP::put()
+     */
+    const SOURCE_CALLBACK = 16;
+    /**
+     * Resumes an upload
+     *
+     * @see \phpseclib3\Net\SFTP::put()
+     */
+    const RESUME = 4;
+    /**
+     * Append a local file to an already existing remote file
+     *
+     * @see \phpseclib3\Net\SFTP::put()
+     */
+    const RESUME_START = 8;
+
+    /**
+     * Packet Types
+     *
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $packet_types = [];
+
+    /**
+     * Status Codes
+     *
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $status_codes = [];
+
+    /** @var array<int, string> */
+    private static $attributes;
+
+    /** @var array<int, string> */
+    private static $open_flags;
+
+    /** @var array<int, string> */
+    private static $open_flags5;
+
+    /** @var array<int, string> */
+    private static $file_types;
+
+    /**
+     * The Request ID
+     *
+     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
+     * concurrent actions, so it's somewhat academic, here.
+     *
+     * @var boolean
+     * @see self::_send_sftp_packet()
+     */
+    private $use_request_id = false;
+
+    /**
+     * The Packet Type
+     *
+     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
+     * concurrent actions, so it's somewhat academic, here.
+     *
+     * @var int
+     * @see self::_get_sftp_packet()
+     */
+    private $packet_type = -1;
+
+    /**
+     * Packet Buffer
+     *
+     * @var string
+     * @see self::_get_sftp_packet()
+     */
+    private $packet_buffer = '';
+
+    /**
+     * Extensions supported by the server
+     *
+     * @var array
+     * @see self::_initChannel()
+     */
+    private $extensions = [];
+
+    /**
+     * Server SFTP version
+     *
+     * @var int
+     * @see self::_initChannel()
+     */
+    private $version;
+
+    /**
+     * Default Server SFTP version
+     *
+     * @var int
+     * @see self::_initChannel()
+     */
+    private $defaultVersion;
+
+    /**
+     * Preferred SFTP version
+     *
+     * @var int
+     * @see self::_initChannel()
+     */
+    private $preferredVersion = 3;
+
+    /**
+     * Current working directory
+     *
+     * @var string|bool
+     * @see self::realpath()
+     * @see self::chdir()
+     */
+    private $pwd = false;
+
+    /**
+     * Packet Type Log
+     *
+     * @see self::getLog()
+     * @var array
+     */
+    private $packet_type_log = [];
+
+    /**
+     * Packet Log
+     *
+     * @see self::getLog()
+     * @var array
+     */
+    private $packet_log = [];
+
+    /**
+     * Real-time log file pointer
+     *
+     * @see self::_append_log()
+     * @var resource|closed-resource
+     */
+    private $realtime_log_file;
+
+    /**
+     * Real-time log file size
+     *
+     * @see self::_append_log()
+     * @var int
+     */
+    private $realtime_log_size;
+
+    /**
+     * Real-time log file wrap boolean
+     *
+     * @see self::_append_log()
+     * @var bool
+     */
+    private $realtime_log_wrap;
+
+    /**
+     * Current log size
+     *
+     * Should never exceed self::LOG_MAX_SIZE
+     *
+     * @var int
+     */
+    private $log_size;
+
+    /**
+     * Error information
+     *
+     * @see self::getSFTPErrors()
+     * @see self::getLastSFTPError()
+     * @var array
+     */
+    private $sftp_errors = [];
+
+    /**
+     * Stat Cache
+     *
+     * Rather than always having to open a directory and close it immediately there after to see if a file is a directory
+     * we'll cache the results.
+     *
+     * @see self::_update_stat_cache()
+     * @see self::_remove_from_stat_cache()
+     * @see self::_query_stat_cache()
+     * @var array
+     */
+    private $stat_cache = [];
+
+    /**
+     * Max SFTP Packet Size
+     *
+     * @see self::__construct()
+     * @see self::get()
+     * @var int
+     */
+    private $max_sftp_packet;
+
+    /**
+     * Stat Cache Flag
+     *
+     * @see self::disableStatCache()
+     * @see self::enableStatCache()
+     * @var bool
+     */
+    private $use_stat_cache = true;
+
+    /**
+     * Sort Options
+     *
+     * @see self::_comparator()
+     * @see self::setListOrder()
+     * @var array
+     */
+    protected $sortOptions = [];
+
+    /**
+     * Canonicalization Flag
+     *
+     * Determines whether or not paths should be canonicalized before being
+     * passed on to the remote server.
+     *
+     * @see self::enablePathCanonicalization()
+     * @see self::disablePathCanonicalization()
+     * @see self::realpath()
+     * @var bool
+     */
+    private $canonicalize_paths = true;
+
+    /**
+     * Request Buffers
+     *
+     * @see self::_get_sftp_packet()
+     * @var array
+     */
+    private $requestBuffer = [];
+
+    /**
+     * Preserve timestamps on file downloads / uploads
+     *
+     * @see self::get()
+     * @see self::put()
+     * @var bool
+     */
+    private $preserveTime = false;
+
+    /**
+     * Arbitrary Length Packets Flag
+     *
+     * Determines whether or not packets of any length should be allowed,
+     * in cases where the server chooses the packet length (such as
+     * directory listings). By default, packets are only allowed to be
+     * 256 * 1024 bytes (SFTP_MAX_MSG_LENGTH from OpenSSH's sftp-common.h)
+     *
+     * @see self::enableArbitraryLengthPackets()
+     * @see self::_get_sftp_packet()
+     * @var bool
+     */
+    private $allow_arbitrary_length_packets = false;
+
+    /**
+     * Was the last packet due to the channels being closed or not?
+     *
+     * @see self::get()
+     * @see self::get_sftp_packet()
+     * @var bool
+     */
+    private $channel_close = false;
+
+    /**
+     * Has the SFTP channel been partially negotiated?
+     *
+     * @var bool
+     */
+    private $partial_init = false;
+
+    /**
+     * Default Constructor.
+     *
+     * Connects to an SFTP server
+     *
+     * $host can either be a string, representing the host, or a stream resource.
+     *
+     * @param mixed $host
+     * @param int $port
+     * @param int $timeout
+     */
+    public function __construct($host, $port = 22, $timeout = 10)
+    {
+        parent::__construct($host, $port, $timeout);
+
+        $this->max_sftp_packet = 1 << 15;
+
+        if (empty(self::$packet_types)) {
+            self::$packet_types = [
+                1  => 'NET_SFTP_INIT',
+                2  => 'NET_SFTP_VERSION',
+                3  => 'NET_SFTP_OPEN',
+                4  => 'NET_SFTP_CLOSE',
+                5  => 'NET_SFTP_READ',
+                6  => 'NET_SFTP_WRITE',
+                7  => 'NET_SFTP_LSTAT',
+                9  => 'NET_SFTP_SETSTAT',
+                10 => 'NET_SFTP_FSETSTAT',
+                11 => 'NET_SFTP_OPENDIR',
+                12 => 'NET_SFTP_READDIR',
+                13 => 'NET_SFTP_REMOVE',
+                14 => 'NET_SFTP_MKDIR',
+                15 => 'NET_SFTP_RMDIR',
+                16 => 'NET_SFTP_REALPATH',
+                17 => 'NET_SFTP_STAT',
+                18 => 'NET_SFTP_RENAME',
+                19 => 'NET_SFTP_READLINK',
+                20 => 'NET_SFTP_SYMLINK',
+                21 => 'NET_SFTP_LINK',
+
+                101 => 'NET_SFTP_STATUS',
+                102 => 'NET_SFTP_HANDLE',
+                103 => 'NET_SFTP_DATA',
+                104 => 'NET_SFTP_NAME',
+                105 => 'NET_SFTP_ATTRS',
+
+                200 => 'NET_SFTP_EXTENDED',
+                201 => 'NET_SFTP_EXTENDED_REPLY'
+            ];
+            self::$status_codes = [
+                0 => 'NET_SFTP_STATUS_OK',
+                1 => 'NET_SFTP_STATUS_EOF',
+                2 => 'NET_SFTP_STATUS_NO_SUCH_FILE',
+                3 => 'NET_SFTP_STATUS_PERMISSION_DENIED',
+                4 => 'NET_SFTP_STATUS_FAILURE',
+                5 => 'NET_SFTP_STATUS_BAD_MESSAGE',
+                6 => 'NET_SFTP_STATUS_NO_CONNECTION',
+                7 => 'NET_SFTP_STATUS_CONNECTION_LOST',
+                8 => 'NET_SFTP_STATUS_OP_UNSUPPORTED',
+                9 => 'NET_SFTP_STATUS_INVALID_HANDLE',
+                10 => 'NET_SFTP_STATUS_NO_SUCH_PATH',
+                11 => 'NET_SFTP_STATUS_FILE_ALREADY_EXISTS',
+                12 => 'NET_SFTP_STATUS_WRITE_PROTECT',
+                13 => 'NET_SFTP_STATUS_NO_MEDIA',
+                14 => 'NET_SFTP_STATUS_NO_SPACE_ON_FILESYSTEM',
+                15 => 'NET_SFTP_STATUS_QUOTA_EXCEEDED',
+                16 => 'NET_SFTP_STATUS_UNKNOWN_PRINCIPAL',
+                17 => 'NET_SFTP_STATUS_LOCK_CONFLICT',
+                18 => 'NET_SFTP_STATUS_DIR_NOT_EMPTY',
+                19 => 'NET_SFTP_STATUS_NOT_A_DIRECTORY',
+                20 => 'NET_SFTP_STATUS_INVALID_FILENAME',
+                21 => 'NET_SFTP_STATUS_LINK_LOOP',
+                22 => 'NET_SFTP_STATUS_CANNOT_DELETE',
+                23 => 'NET_SFTP_STATUS_INVALID_PARAMETER',
+                24 => 'NET_SFTP_STATUS_FILE_IS_A_DIRECTORY',
+                25 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_CONFLICT',
+                26 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_REFUSED',
+                27 => 'NET_SFTP_STATUS_DELETE_PENDING',
+                28 => 'NET_SFTP_STATUS_FILE_CORRUPT',
+                29 => 'NET_SFTP_STATUS_OWNER_INVALID',
+                30 => 'NET_SFTP_STATUS_GROUP_INVALID',
+                31 => 'NET_SFTP_STATUS_NO_MATCHING_BYTE_RANGE_LOCK'
+            ];
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-7.1
+            // the order, in this case, matters quite a lot - see \phpseclib3\Net\SFTP::_parseAttributes() to understand why
+            self::$attributes = [
+                0x00000001 => 'NET_SFTP_ATTR_SIZE',
+                0x00000002 => 'NET_SFTP_ATTR_UIDGID',          // defined in SFTPv3, removed in SFTPv4+
+                0x00000080 => 'NET_SFTP_ATTR_OWNERGROUP',      // defined in SFTPv4+
+                0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',
+                0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',
+                0x00000010 => 'NET_SFTP_ATTR_CREATETIME',      // SFTPv4+
+                0x00000020 => 'NET_SFTP_ATTR_MODIFYTIME',
+                0x00000040 => 'NET_SFTP_ATTR_ACL',
+                0x00000100 => 'NET_SFTP_ATTR_SUBSECOND_TIMES',
+                0x00000200 => 'NET_SFTP_ATTR_BITS',            // SFTPv5+
+                0x00000400 => 'NET_SFTP_ATTR_ALLOCATION_SIZE', // SFTPv6+
+                0x00000800 => 'NET_SFTP_ATTR_TEXT_HINT',
+                0x00001000 => 'NET_SFTP_ATTR_MIME_TYPE',
+                0x00002000 => 'NET_SFTP_ATTR_LINK_COUNT',
+                0x00004000 => 'NET_SFTP_ATTR_UNTRANSLATED_NAME',
+                0x00008000 => 'NET_SFTP_ATTR_CTIME',
+                // 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers
+                // yields inconsistent behavior depending on how php is compiled.  so we left shift -1 (which, in
+                // two's compliment, consists of all 1 bits) by 31.  on 64-bit systems this'll yield 0xFFFFFFFF80000000.
+                // that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.
+                (PHP_INT_SIZE == 4 ? (-1 << 31) : 0x80000000) => 'NET_SFTP_ATTR_EXTENDED'
+            ];
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3
+            // the flag definitions change somewhat in SFTPv5+.  if SFTPv5+ support is added to this library, maybe name
+            // the array for that $this->open5_flags and similarly alter the constant names.
+            self::$open_flags = [
+                0x00000001 => 'NET_SFTP_OPEN_READ',
+                0x00000002 => 'NET_SFTP_OPEN_WRITE',
+                0x00000004 => 'NET_SFTP_OPEN_APPEND',
+                0x00000008 => 'NET_SFTP_OPEN_CREATE',
+                0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',
+                0x00000020 => 'NET_SFTP_OPEN_EXCL',
+                0x00000040 => 'NET_SFTP_OPEN_TEXT' // defined in SFTPv4
+            ];
+            // SFTPv5+ changed the flags up:
+            // https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-8.1.1.3
+            self::$open_flags5 = [
+                // when SSH_FXF_ACCESS_DISPOSITION is a 3 bit field that controls how the file is opened
+                0x00000000 => 'NET_SFTP_OPEN_CREATE_NEW',
+                0x00000001 => 'NET_SFTP_OPEN_CREATE_TRUNCATE',
+                0x00000002 => 'NET_SFTP_OPEN_OPEN_EXISTING',
+                0x00000003 => 'NET_SFTP_OPEN_OPEN_OR_CREATE',
+                0x00000004 => 'NET_SFTP_OPEN_TRUNCATE_EXISTING',
+                // the rest of the flags are not supported
+                0x00000008 => 'NET_SFTP_OPEN_APPEND_DATA', // "the offset field of SS_FXP_WRITE requests is ignored"
+                0x00000010 => 'NET_SFTP_OPEN_APPEND_DATA_ATOMIC',
+                0x00000020 => 'NET_SFTP_OPEN_TEXT_MODE',
+                0x00000040 => 'NET_SFTP_OPEN_BLOCK_READ',
+                0x00000080 => 'NET_SFTP_OPEN_BLOCK_WRITE',
+                0x00000100 => 'NET_SFTP_OPEN_BLOCK_DELETE',
+                0x00000200 => 'NET_SFTP_OPEN_BLOCK_ADVISORY',
+                0x00000400 => 'NET_SFTP_OPEN_NOFOLLOW',
+                0x00000800 => 'NET_SFTP_OPEN_DELETE_ON_CLOSE',
+                0x00001000 => 'NET_SFTP_OPEN_ACCESS_AUDIT_ALARM_INFO',
+                0x00002000 => 'NET_SFTP_OPEN_ACCESS_BACKUP',
+                0x00004000 => 'NET_SFTP_OPEN_BACKUP_STREAM',
+                0x00008000 => 'NET_SFTP_OPEN_OVERRIDE_OWNER',
+            ];
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
+            // see \phpseclib3\Net\SFTP::_parseLongname() for an explanation
+            self::$file_types = [
+                1 => 'NET_SFTP_TYPE_REGULAR',
+                2 => 'NET_SFTP_TYPE_DIRECTORY',
+                3 => 'NET_SFTP_TYPE_SYMLINK',
+                4 => 'NET_SFTP_TYPE_SPECIAL',
+                5 => 'NET_SFTP_TYPE_UNKNOWN',
+                // the following types were first defined for use in SFTPv5+
+                // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
+                6 => 'NET_SFTP_TYPE_SOCKET',
+                7 => 'NET_SFTP_TYPE_CHAR_DEVICE',
+                8 => 'NET_SFTP_TYPE_BLOCK_DEVICE',
+                9 => 'NET_SFTP_TYPE_FIFO'
+            ];
+            self::define_array(
+                self::$packet_types,
+                self::$status_codes,
+                self::$attributes,
+                self::$open_flags,
+                self::$open_flags5,
+                self::$file_types
+            );
+        }
+
+        if (!defined('NET_SFTP_QUEUE_SIZE')) {
+            define('NET_SFTP_QUEUE_SIZE', 32);
+        }
+        if (!defined('NET_SFTP_UPLOAD_QUEUE_SIZE')) {
+            define('NET_SFTP_UPLOAD_QUEUE_SIZE', 1024);
+        }
+    }
+
+    /**
+     * Check a few things before SFTP functions are called
+     *
+     * @return bool
+     */
+    private function precheck()
+    {
+        if (!($this->bitmap & SSH2::MASK_LOGIN)) {
+            return false;
+        }
+
+        if ($this->pwd === false) {
+            return $this->init_sftp_connection();
+        }
+
+        return true;
+    }
+
+    /**
+     * Partially initialize an SFTP connection
+     *
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    private function partial_init_sftp_connection()
+    {
+        $response = $this->open_channel(self::CHANNEL, true);
+        if ($response === true && $this->isTimeout()) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2(
+            'CNsbs',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[self::CHANNEL],
+            'subsystem',
+            true,
+            'sftp'
+        );
+        $this->send_binary_packet($packet);
+
+        $this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $response = $this->get_channel_packet(self::CHANNEL, true);
+        if ($response === false) {
+            // from PuTTY's psftp.exe
+            $command = "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n" .
+                       "test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n" .
+                       "exec sftp-server";
+            // we don't do $this->exec($command, false) because exec() operates on a different channel and plus the SSH_MSG_CHANNEL_OPEN that exec() does
+            // is redundant
+            $packet = Strings::packSSH2(
+                'CNsCs',
+                NET_SSH2_MSG_CHANNEL_REQUEST,
+                $this->server_channels[self::CHANNEL],
+                'exec',
+                1,
+                $command
+            );
+            $this->send_binary_packet($packet);
+
+            $this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+            $response = $this->get_channel_packet(self::CHANNEL, true);
+            if ($response === false) {
+                return false;
+            }
+        } elseif ($response === true && $this->isTimeout()) {
+            return false;
+        }
+
+        $this->channel_status[self::CHANNEL] = NET_SSH2_MSG_CHANNEL_DATA;
+        $this->send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3");
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_VERSION) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_VERSION. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        $this->use_request_id = true;
+
+        list($this->defaultVersion) = Strings::unpackSSH2('N', $response);
+        while (!empty($response)) {
+            list($key, $value) = Strings::unpackSSH2('ss', $response);
+            $this->extensions[$key] = $value;
+        }
+
+        $this->partial_init = true;
+
+        return true;
+    }
+
+    /**
+     * (Re)initializes the SFTP channel
+     *
+     * @return bool
+     */
+    private function init_sftp_connection()
+    {
+        if (!$this->partial_init && !$this->partial_init_sftp_connection()) {
+            return false;
+        }
+
+        /*
+         A Note on SFTPv4/5/6 support:
+         <http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.1> states the following:
+
+         "If the client wishes to interoperate with servers that support noncontiguous version
+          numbers it SHOULD send '3'"
+
+         Given that the server only sends its version number after the client has already done so, the above
+         seems to be suggesting that v3 should be the default version.  This makes sense given that v3 is the
+         most popular.
+
+         <http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.5> states the following;
+
+         "If the server did not send the "versions" extension, or the version-from-list was not included, the
+          server MAY send a status response describing the failure, but MUST then close the channel without
+          processing any further requests."
+
+         So what do you do if you have a client whose initial SSH_FXP_INIT packet says it implements v3 and
+         a server whose initial SSH_FXP_VERSION reply says it implements v4 and only v4?  If it only implements
+         v4, the "versions" extension is likely not going to have been sent so version re-negotiation as discussed
+         in draft-ietf-secsh-filexfer-13 would be quite impossible.  As such, what \phpseclib3\Net\SFTP would do is close the
+         channel and reopen it with a new and updated SSH_FXP_INIT packet.
+        */
+        $this->version = $this->defaultVersion;
+        if (isset($this->extensions['versions']) && (!$this->preferredVersion || $this->preferredVersion != $this->version)) {
+            $versions = explode(',', $this->extensions['versions']);
+            $supported = [6, 5, 4];
+            if ($this->preferredVersion) {
+                $supported = array_diff($supported, [$this->preferredVersion]);
+                array_unshift($supported, $this->preferredVersion);
+            }
+            foreach ($supported as $ver) {
+                if (in_array($ver, $versions)) {
+                    if ($ver === $this->version) {
+                        break;
+                    }
+                    $this->version = (int) $ver;
+                    $packet = Strings::packSSH2('ss', 'version-select', "$ver");
+                    $this->send_sftp_packet(NET_SFTP_EXTENDED, $packet);
+                    $response = $this->get_sftp_packet();
+                    if ($this->packet_type != NET_SFTP_STATUS) {
+                        throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                            . 'Got packet type: ' . $this->packet_type);
+                    }
+                    list($status) = Strings::unpackSSH2('N', $response);
+                    if ($status != NET_SFTP_STATUS_OK) {
+                        $this->logError($response, $status);
+                        throw new \UnexpectedValueException('Expected NET_SFTP_STATUS_OK. '
+                            . ' Got ' . $status);
+                    }
+                    break;
+                }
+            }
+        }
+
+        /*
+         SFTPv4+ defines a 'newline' extension.  SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
+         however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
+         not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
+         one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
+         'newline@vandyke.com' would.
+        */
+        /*
+        if (isset($this->extensions['newline@vandyke.com'])) {
+            $this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
+            unset($this->extensions['newline@vandyke.com']);
+        }
+        */
+        if ($this->version < 2 || $this->version > 6) {
+            return false;
+        }
+
+        $this->pwd = true;
+        try {
+            $this->pwd = $this->realpath('.');
+        } catch (\UnexpectedValueException $e) {
+            if (!$this->canonicalize_paths) {
+                throw $e;
+            }
+            $this->canonicalize_paths = false;
+            $this->reset_sftp();
+            return $this->init_sftp_connection();
+        }
+
+        $this->update_stat_cache($this->pwd, []);
+
+        return true;
+    }
+
+    /**
+     * Disable the stat cache
+     *
+     */
+    public function disableStatCache()
+    {
+        $this->use_stat_cache = false;
+    }
+
+    /**
+     * Enable the stat cache
+     *
+     */
+    public function enableStatCache()
+    {
+        $this->use_stat_cache = true;
+    }
+
+    /**
+     * Clear the stat cache
+     *
+     */
+    public function clearStatCache()
+    {
+        $this->stat_cache = [];
+    }
+
+    /**
+     * Enable path canonicalization
+     *
+     */
+    public function enablePathCanonicalization()
+    {
+        $this->canonicalize_paths = true;
+    }
+
+    /**
+     * Disable path canonicalization
+     *
+     * If this is enabled then $sftp->pwd() will not return the canonicalized absolute path
+     *
+     */
+    public function disablePathCanonicalization()
+    {
+        $this->canonicalize_paths = false;
+    }
+
+    /**
+     * Enable arbitrary length packets
+     *
+     */
+    public function enableArbitraryLengthPackets()
+    {
+        $this->allow_arbitrary_length_packets = true;
+    }
+
+    /**
+     * Disable arbitrary length packets
+     *
+     */
+    public function disableArbitraryLengthPackets()
+    {
+        $this->allow_arbitrary_length_packets = false;
+    }
+
+    /**
+     * Returns the current directory name
+     *
+     * @return string|bool
+     */
+    public function pwd()
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        return $this->pwd;
+    }
+
+    /**
+     * Logs errors
+     *
+     * @param string $response
+     * @param int $status
+     */
+    private function logError($response, $status = -1)
+    {
+        if ($status == -1) {
+            list($status) = Strings::unpackSSH2('N', $response);
+        }
+
+        $error = self::$status_codes[$status];
+
+        if ($this->version > 2) {
+            list($message) = Strings::unpackSSH2('s', $response);
+            $this->sftp_errors[] = "$error: $message";
+        } else {
+            $this->sftp_errors[] = $error;
+        }
+    }
+
+    /**
+     * Canonicalize the Server-Side Path Name
+     *
+     * SFTP doesn't provide a mechanism by which the current working directory can be changed, so we'll emulate it.  Returns
+     * the absolute (canonicalized) path.
+     *
+     * If canonicalize_paths has been disabled using disablePathCanonicalization(), $path is returned as-is.
+     *
+     * @see self::chdir()
+     * @see self::disablePathCanonicalization()
+     * @param string $path
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return mixed
+     */
+    public function realpath($path)
+    {
+        if ($this->precheck() === false) {
+            return false;
+        }
+
+        if (!$this->canonicalize_paths) {
+            if ($this->pwd === true) {
+                return '.';
+            }
+            if (!strlen($path) || $path[0] != '/') {
+                $path = $this->pwd . '/' . $path;
+            }
+            $parts = explode('/', $path);
+            $afterPWD = $beforePWD = [];
+            foreach ($parts as $part) {
+                switch ($part) {
+                    //case '': // some SFTP servers /require/ double /'s. see https://github.com/phpseclib/phpseclib/pull/1137
+                    case '.':
+                        break;
+                    case '..':
+                        if (!empty($afterPWD)) {
+                            array_pop($afterPWD);
+                        } else {
+                            $beforePWD[] = '..';
+                        }
+                        break;
+                    default:
+                        $afterPWD[] = $part;
+                }
+            }
+            $beforePWD = count($beforePWD) ? implode('/', $beforePWD) : '.';
+            return $beforePWD . '/' . implode('/', $afterPWD);
+        }
+
+        if ($this->pwd === true) {
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
+            $this->send_sftp_packet(NET_SFTP_REALPATH, Strings::packSSH2('s', $path));
+
+            $response = $this->get_sftp_packet();
+            switch ($this->packet_type) {
+                case NET_SFTP_NAME:
+                    // although SSH_FXP_NAME is implemented differently in SFTPv3 than it is in SFTPv4+, the following
+                    // should work on all SFTP versions since the only part of the SSH_FXP_NAME packet the following looks
+                    // at is the first part and that part is defined the same in SFTP versions 3 through 6.
+                    list(, $filename) = Strings::unpackSSH2('Ns', $response);
+                    return $filename;
+                case NET_SFTP_STATUS:
+                    $this->logError($response);
+                    return false;
+                default:
+                    throw new \UnexpectedValueException('Expected NET_SFTP_NAME or NET_SFTP_STATUS. '
+                                                      . 'Got packet type: ' . $this->packet_type);
+            }
+        }
+
+        if (!strlen($path) || $path[0] != '/') {
+            $path = $this->pwd . '/' . $path;
+        }
+
+        $path = explode('/', $path);
+        $new = [];
+        foreach ($path as $dir) {
+            if (!strlen($dir)) {
+                continue;
+            }
+            switch ($dir) {
+                case '..':
+                    array_pop($new);
+                    // fall-through
+                case '.':
+                    break;
+                default:
+                    $new[] = $dir;
+            }
+        }
+
+        return '/' . implode('/', $new);
+    }
+
+    /**
+     * Changes the current directory
+     *
+     * @param string $dir
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    public function chdir($dir)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        // assume current dir if $dir is empty
+        if ($dir === '') {
+            $dir = './';
+        // suffix a slash if needed
+        } elseif ($dir[strlen($dir) - 1] != '/') {
+            $dir .= '/';
+        }
+
+        $dir = $this->realpath($dir);
+
+        // confirm that $dir is, in fact, a valid directory
+        if ($this->use_stat_cache && is_array($this->query_stat_cache($dir))) {
+            $this->pwd = $dir;
+            return true;
+        }
+
+        // we could do a stat on the alleged $dir to see if it's a directory but that doesn't tell us
+        // the currently logged in user has the appropriate permissions or not. maybe you could see if
+        // the file's uid / gid match the currently logged in user's uid / gid but how there's no easy
+        // way to get those with SFTP
+
+        $this->send_sftp_packet(NET_SFTP_OPENDIR, Strings::packSSH2('s', $dir));
+
+        // see \phpseclib3\Net\SFTP::nlist() for a more thorough explanation of the following
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS' .
+                                                    'Got packet type: ' . $this->packet_type);
+        }
+
+        if (!$this->close_handle($handle)) {
+            return false;
+        }
+
+        $this->update_stat_cache($dir, []);
+
+        $this->pwd = $dir;
+        return true;
+    }
+
+    /**
+     * Returns a list of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @return array|false
+     */
+    public function nlist($dir = '.', $recursive = false)
+    {
+        return $this->nlist_helper($dir, $recursive, '');
+    }
+
+    /**
+     * Helper method for nlist
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @param string $relativeDir
+     * @return array|false
+     */
+    private function nlist_helper($dir, $recursive, $relativeDir)
+    {
+        $files = $this->readlist($dir, false);
+
+        // If we get an int back, then that is an "unexpected" status.
+        // We do not have a file list, so return false.
+        if (is_int($files)) {
+            return false;
+        }
+
+        if (!$recursive || $files === false) {
+            return $files;
+        }
+
+        $result = [];
+        foreach ($files as $value) {
+            if ($value == '.' || $value == '..') {
+                $result[] = $relativeDir . $value;
+                continue;
+            }
+            if (is_array($this->query_stat_cache($this->realpath($dir . '/' . $value)))) {
+                $temp = $this->nlist_helper($dir . '/' . $value, true, $relativeDir . $value . '/');
+                $temp = is_array($temp) ? $temp : [];
+                $result = array_merge($result, $temp);
+            } else {
+                $result[] = $relativeDir . $value;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Returns a detailed list of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @return array|false
+     */
+    public function rawlist($dir = '.', $recursive = false)
+    {
+        $files = $this->readlist($dir, true);
+
+        // If we get an int back, then that is an "unexpected" status.
+        // We do not have a file list, so return false.
+        if (is_int($files)) {
+            return false;
+        }
+
+        if (!$recursive || $files === false) {
+            return $files;
+        }
+
+        static $depth = 0;
+
+        foreach ($files as $key => $value) {
+            if ($depth != 0 && $key == '..') {
+                unset($files[$key]);
+                continue;
+            }
+            $is_directory = false;
+            if ($key != '.' && $key != '..') {
+                if ($this->use_stat_cache) {
+                    $is_directory = is_array($this->query_stat_cache($this->realpath($dir . '/' . $key)));
+                } else {
+                    $stat = $this->lstat($dir . '/' . $key);
+                    $is_directory = $stat && $stat['type'] === NET_SFTP_TYPE_DIRECTORY;
+                }
+            }
+
+            if ($is_directory) {
+                $depth++;
+                $files[$key] = $this->rawlist($dir . '/' . $key, true);
+                $depth--;
+            } else {
+                $files[$key] = (object) $value;
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * Reads a list, be it detailed or not, of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $raw
+     * @return array|false
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     */
+    private function readlist($dir, $raw = true)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $dir = $this->realpath($dir . '/');
+        if ($dir === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.2
+        $this->send_sftp_packet(NET_SFTP_OPENDIR, Strings::packSSH2('s', $dir));
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.2
+                // since 'handle' is the last field in the SSH_FXP_HANDLE packet, we'll just remove the first four bytes that
+                // represent the length of the string and leave it at that
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                list($status) = Strings::unpackSSH2('N', $response);
+                $this->logError($response, $status);
+                return $status;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+
+        $this->update_stat_cache($dir, []);
+
+        $contents = [];
+        while (true) {
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.2
+            // why multiple SSH_FXP_READDIR packets would be sent when the response to a single one can span arbitrarily many
+            // SSH_MSG_CHANNEL_DATA messages is not known to me.
+            $this->send_sftp_packet(NET_SFTP_READDIR, Strings::packSSH2('s', $handle));
+
+            $response = $this->get_sftp_packet();
+            switch ($this->packet_type) {
+                case NET_SFTP_NAME:
+                    list($count) = Strings::unpackSSH2('N', $response);
+                    for ($i = 0; $i < $count; $i++) {
+                        list($shortname) = Strings::unpackSSH2('s', $response);
+                        // SFTPv4 "removed the long filename from the names structure-- it can now be
+                        //         built from information available in the attrs structure."
+                        if ($this->version < 4) {
+                            list($longname) = Strings::unpackSSH2('s', $response);
+                        }
+                        $attributes = $this->parseAttributes($response);
+                        if (!isset($attributes['type']) && $this->version < 4) {
+                            $fileType = $this->parseLongname($longname);
+                            if ($fileType) {
+                                $attributes['type'] = $fileType;
+                            }
+                        }
+                        $contents[$shortname] = $attributes + ['filename' => $shortname];
+
+                        if (isset($attributes['type']) && $attributes['type'] == NET_SFTP_TYPE_DIRECTORY && ($shortname != '.' && $shortname != '..')) {
+                            $this->update_stat_cache($dir . '/' . $shortname, []);
+                        } else {
+                            if ($shortname == '..') {
+                                $temp = $this->realpath($dir . '/..') . '/.';
+                            } else {
+                                $temp = $dir . '/' . $shortname;
+                            }
+                            $this->update_stat_cache($temp, (object) ['lstat' => $attributes]);
+                        }
+                        // SFTPv6 has an optional boolean end-of-list field, but we'll ignore that, since the
+                        // final SSH_FXP_STATUS packet should tell us that, already.
+                    }
+                    break;
+                case NET_SFTP_STATUS:
+                    list($status) = Strings::unpackSSH2('N', $response);
+                    if ($status != NET_SFTP_STATUS_EOF) {
+                        $this->logError($response, $status);
+                        return $status;
+                    }
+                    break 2;
+                default:
+                    throw new \UnexpectedValueException('Expected NET_SFTP_NAME or NET_SFTP_STATUS. '
+                                                      . 'Got packet type: ' . $this->packet_type);
+            }
+        }
+
+        if (!$this->close_handle($handle)) {
+            return false;
+        }
+
+        if (count($this->sortOptions)) {
+            uasort($contents, [&$this, 'comparator']);
+        }
+
+        return $raw ? $contents : array_map('strval', array_keys($contents));
+    }
+
+    /**
+     * Compares two rawlist entries using parameters set by setListOrder()
+     *
+     * Intended for use with uasort()
+     *
+     * @param array $a
+     * @param array $b
+     * @return int
+     */
+    private function comparator(array $a, array $b)
+    {
+        switch (true) {
+            case $a['filename'] === '.' || $b['filename'] === '.':
+                if ($a['filename'] === $b['filename']) {
+                    return 0;
+                }
+                return $a['filename'] === '.' ? -1 : 1;
+            case $a['filename'] === '..' || $b['filename'] === '..':
+                if ($a['filename'] === $b['filename']) {
+                    return 0;
+                }
+                return $a['filename'] === '..' ? -1 : 1;
+            case isset($a['type']) && $a['type'] === NET_SFTP_TYPE_DIRECTORY:
+                if (!isset($b['type'])) {
+                    return 1;
+                }
+                if ($b['type'] !== $a['type']) {
+                    return -1;
+                }
+                break;
+            case isset($b['type']) && $b['type'] === NET_SFTP_TYPE_DIRECTORY:
+                return 1;
+        }
+        foreach ($this->sortOptions as $sort => $order) {
+            if (!isset($a[$sort]) || !isset($b[$sort])) {
+                if (isset($a[$sort])) {
+                    return -1;
+                }
+                if (isset($b[$sort])) {
+                    return 1;
+                }
+                return 0;
+            }
+            switch ($sort) {
+                case 'filename':
+                    $result = strcasecmp($a['filename'], $b['filename']);
+                    if ($result) {
+                        return $order === SORT_DESC ? -$result : $result;
+                    }
+                    break;
+                case 'mode':
+                    $a[$sort] &= 07777;
+                    $b[$sort] &= 07777;
+                    // fall-through
+                default:
+                    if ($a[$sort] === $b[$sort]) {
+                        break;
+                    }
+                    return $order === SORT_ASC ? $a[$sort] - $b[$sort] : $b[$sort] - $a[$sort];
+            }
+        }
+    }
+
+    /**
+     * Defines how nlist() and rawlist() will be sorted - if at all.
+     *
+     * If sorting is enabled directories and files will be sorted independently with
+     * directories appearing before files in the resultant array that is returned.
+     *
+     * Any parameter returned by stat is a valid sort parameter for this function.
+     * Filename comparisons are case insensitive.
+     *
+     * Examples:
+     *
+     * $sftp->setListOrder('filename', SORT_ASC);
+     * $sftp->setListOrder('size', SORT_DESC, 'filename', SORT_ASC);
+     * $sftp->setListOrder(true);
+     *    Separates directories from files but doesn't do any sorting beyond that
+     * $sftp->setListOrder();
+     *    Don't do any sort of sorting
+     *
+     * @param string ...$args
+     */
+    public function setListOrder(...$args)
+    {
+        $this->sortOptions = [];
+        if (empty($args)) {
+            return;
+        }
+        $len = count($args) & 0x7FFFFFFE;
+        for ($i = 0; $i < $len; $i += 2) {
+            $this->sortOptions[$args[$i]] = $args[$i + 1];
+        }
+        if (!count($this->sortOptions)) {
+            $this->sortOptions = ['bogus' => true];
+        }
+    }
+
+    /**
+     * Save files / directories to cache
+     *
+     * @param string $path
+     * @param mixed $value
+     */
+    private function update_stat_cache($path, $value)
+    {
+        if ($this->use_stat_cache === false) {
+            return;
+        }
+
+        // preg_replace('#^/|/(?=/)|/$#', '', $dir) == str_replace('//', '/', trim($path, '/'))
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        $max = count($dirs) - 1;
+        foreach ($dirs as $i => $dir) {
+            // if $temp is an object that means one of two things.
+            //  1. a file was deleted and changed to a directory behind phpseclib's back
+            //  2. it's a symlink. when lstat is done it's unclear what it's a symlink to
+            if (is_object($temp)) {
+                $temp = [];
+            }
+            if (!isset($temp[$dir])) {
+                $temp[$dir] = [];
+            }
+            if ($i === $max) {
+                if (is_object($temp[$dir]) && is_object($value)) {
+                    if (!isset($value->stat) && isset($temp[$dir]->stat)) {
+                        $value->stat = $temp[$dir]->stat;
+                    }
+                    if (!isset($value->lstat) && isset($temp[$dir]->lstat)) {
+                        $value->lstat = $temp[$dir]->lstat;
+                    }
+                }
+                $temp[$dir] = $value;
+                break;
+            }
+            $temp = &$temp[$dir];
+        }
+    }
+
+    /**
+     * Remove files / directories from cache
+     *
+     * @param string $path
+     * @return bool
+     */
+    private function remove_from_stat_cache($path)
+    {
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        $max = count($dirs) - 1;
+        foreach ($dirs as $i => $dir) {
+            if (!is_array($temp)) {
+                return false;
+            }
+            if ($i === $max) {
+                unset($temp[$dir]);
+                return true;
+            }
+            if (!isset($temp[$dir])) {
+                return false;
+            }
+            $temp = &$temp[$dir];
+        }
+    }
+
+    /**
+     * Checks cache for path
+     *
+     * Mainly used by file_exists
+     *
+     * @param string $path
+     * @return mixed
+     */
+    private function query_stat_cache($path)
+    {
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        foreach ($dirs as $dir) {
+            if (!is_array($temp)) {
+                return null;
+            }
+            if (!isset($temp[$dir])) {
+                return null;
+            }
+            $temp = &$temp[$dir];
+        }
+        return $temp;
+    }
+
+    /**
+     * Returns general information about a file.
+     *
+     * Returns an array on success and false otherwise.
+     *
+     * @param string $filename
+     * @return array|false
+     */
+    public function stat($filename)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $filename = $this->realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if ($this->use_stat_cache) {
+            $result = $this->query_stat_cache($filename);
+            if (is_array($result) && isset($result['.']) && isset($result['.']->stat)) {
+                return $result['.']->stat;
+            }
+            if (is_object($result) && isset($result->stat)) {
+                return $result->stat;
+            }
+        }
+
+        $stat = $this->stat_helper($filename, NET_SFTP_STAT);
+        if ($stat === false) {
+            $this->remove_from_stat_cache($filename);
+            return false;
+        }
+        if (isset($stat['type'])) {
+            if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                $filename .= '/.';
+            }
+            $this->update_stat_cache($filename, (object) ['stat' => $stat]);
+            return $stat;
+        }
+
+        $pwd = $this->pwd;
+        $stat['type'] = $this->chdir($filename) ?
+            NET_SFTP_TYPE_DIRECTORY :
+            NET_SFTP_TYPE_REGULAR;
+        $this->pwd = $pwd;
+
+        if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+            $filename .= '/.';
+        }
+        $this->update_stat_cache($filename, (object) ['stat' => $stat]);
+
+        return $stat;
+    }
+
+    /**
+     * Returns general information about a file or symbolic link.
+     *
+     * Returns an array on success and false otherwise.
+     *
+     * @param string $filename
+     * @return array|false
+     */
+    public function lstat($filename)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $filename = $this->realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if ($this->use_stat_cache) {
+            $result = $this->query_stat_cache($filename);
+            if (is_array($result) && isset($result['.']) && isset($result['.']->lstat)) {
+                return $result['.']->lstat;
+            }
+            if (is_object($result) && isset($result->lstat)) {
+                return $result->lstat;
+            }
+        }
+
+        $lstat = $this->stat_helper($filename, NET_SFTP_LSTAT);
+        if ($lstat === false) {
+            $this->remove_from_stat_cache($filename);
+            return false;
+        }
+        if (isset($lstat['type'])) {
+            if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                $filename .= '/.';
+            }
+            $this->update_stat_cache($filename, (object) ['lstat' => $lstat]);
+            return $lstat;
+        }
+
+        $stat = $this->stat_helper($filename, NET_SFTP_STAT);
+
+        if ($lstat != $stat) {
+            $lstat = array_merge($lstat, ['type' => NET_SFTP_TYPE_SYMLINK]);
+            $this->update_stat_cache($filename, (object) ['lstat' => $lstat]);
+            return $stat;
+        }
+
+        $pwd = $this->pwd;
+        $lstat['type'] = $this->chdir($filename) ?
+            NET_SFTP_TYPE_DIRECTORY :
+            NET_SFTP_TYPE_REGULAR;
+        $this->pwd = $pwd;
+
+        if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+            $filename .= '/.';
+        }
+        $this->update_stat_cache($filename, (object) ['lstat' => $lstat]);
+
+        return $lstat;
+    }
+
+    /**
+     * Returns general information about a file or symbolic link
+     *
+     * Determines information without calling \phpseclib3\Net\SFTP::realpath().
+     * The second parameter can be either NET_SFTP_STAT or NET_SFTP_LSTAT.
+     *
+     * @param string $filename
+     * @param int $type
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return array|false
+     */
+    private function stat_helper($filename, $type)
+    {
+        // SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
+        $packet = Strings::packSSH2('s', $filename);
+        $this->send_sftp_packet($type, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_ATTRS:
+                return $this->parseAttributes($response);
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                return false;
+        }
+
+        throw new \UnexpectedValueException('Expected NET_SFTP_ATTRS or NET_SFTP_STATUS. '
+                                          . 'Got packet type: ' . $this->packet_type);
+    }
+
+    /**
+     * Truncates a file to a given length
+     *
+     * @param string $filename
+     * @param int $new_size
+     * @return bool
+     */
+    public function truncate($filename, $new_size)
+    {
+        $attr = Strings::packSSH2('NQ', NET_SFTP_ATTR_SIZE, $new_size);
+
+        return $this->setstat($filename, $attr, false);
+    }
+
+    /**
+     * Sets access and modification time of file.
+     *
+     * If the file does not exist, it will be created.
+     *
+     * @param string $filename
+     * @param int $time
+     * @param int $atime
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    public function touch($filename, $time = null, $atime = null)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $filename = $this->realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if (!isset($time)) {
+            $time = time();
+        }
+        if (!isset($atime)) {
+            $atime = $time;
+        }
+
+        $attr = $this->version < 4 ?
+            pack('N3', NET_SFTP_ATTR_ACCESSTIME, $atime, $time) :
+            Strings::packSSH2('NQ2', NET_SFTP_ATTR_ACCESSTIME | NET_SFTP_ATTR_MODIFYTIME, $atime, $time);
+
+        $packet = Strings::packSSH2('s', $filename);
+        $packet .= $this->version >= 5 ?
+            pack('N2', 0, NET_SFTP_OPEN_OPEN_EXISTING) :
+            pack('N', NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE | NET_SFTP_OPEN_EXCL);
+        $packet .= $attr;
+
+        $this->send_sftp_packet(NET_SFTP_OPEN, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return $this->close_handle(substr($response, 4));
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                break;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+
+        return $this->setstat($filename, $attr, false);
+    }
+
+    /**
+     * Changes file or directory owner
+     *
+     * $uid should be an int for SFTPv3 and a string for SFTPv4+. Ideally the string
+     * would be of the form "user@dns_domain" but it does not need to be.
+     * `$sftp->getSupportedVersions()['version']` will return the specific version
+     * that's being used.
+     *
+     * Returns true on success or false on error.
+     *
+     * @param string $filename
+     * @param int|string $uid
+     * @param bool $recursive
+     * @return bool
+     */
+    public function chown($filename, $uid, $recursive = false)
+    {
+        /*
+         quoting <https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.5>,
+
+         "To avoid a representation that is tied to a particular underlying
+          implementation at the client or server, the use of UTF-8 strings has
+          been chosen.  The string should be of the form "user@dns_domain".
+          This will allow for a client and server that do not use the same
+          local representation the ability to translate to a common syntax that
+          can be interpreted by both.  In the case where there is no
+          translation available to the client or server, the attribute value
+          must be constructed without the "@"."
+
+         phpseclib _could_ auto append the dns_domain to $uid BUT what if it shouldn't
+         have one? phpseclib would have no way of knowing so rather than guess phpseclib
+         will just use whatever value the user provided
+       */
+
+        $attr = $this->version < 4 ?
+            // quoting <http://www.kernel.org/doc/man-pages/online/pages/man2/chown.2.html>,
+            // "if the owner or group is specified as -1, then that ID is not changed"
+            pack('N3', NET_SFTP_ATTR_UIDGID, $uid, -1) :
+            // quoting <https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.5>,
+            // "If either the owner or group field is zero length, the field should be
+            //  considered absent, and no change should be made to that specific field
+            //  during a modification operation"
+            Strings::packSSH2('Nss', NET_SFTP_ATTR_OWNERGROUP, $uid, '');
+
+        return $this->setstat($filename, $attr, $recursive);
+    }
+
+    /**
+     * Changes file or directory group
+     *
+     * $gid should be an int for SFTPv3 and a string for SFTPv4+. Ideally the string
+     * would be of the form "user@dns_domain" but it does not need to be.
+     * `$sftp->getSupportedVersions()['version']` will return the specific version
+     * that's being used.
+     *
+     * Returns true on success or false on error.
+     *
+     * @param string $filename
+     * @param int|string $gid
+     * @param bool $recursive
+     * @return bool
+     */
+    public function chgrp($filename, $gid, $recursive = false)
+    {
+        $attr = $this->version < 4 ?
+            pack('N3', NET_SFTP_ATTR_UIDGID, -1, $gid) :
+            Strings::packSSH2('Nss', NET_SFTP_ATTR_OWNERGROUP, '', $gid);
+
+        return $this->setstat($filename, $attr, $recursive);
+    }
+
+    /**
+     * Set permissions on a file.
+     *
+     * Returns the new file permissions on success or false on error.
+     * If $recursive is true than this just returns true or false.
+     *
+     * @param int $mode
+     * @param string $filename
+     * @param bool $recursive
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return mixed
+     */
+    public function chmod($mode, $filename, $recursive = false)
+    {
+        if (is_string($mode) && is_int($filename)) {
+            $temp = $mode;
+            $mode = $filename;
+            $filename = $temp;
+        }
+
+        $attr = pack('N2', NET_SFTP_ATTR_PERMISSIONS, $mode & 07777);
+        if (!$this->setstat($filename, $attr, $recursive)) {
+            return false;
+        }
+        if ($recursive) {
+            return true;
+        }
+
+        $filename = $this->realpath($filename);
+        // rather than return what the permissions *should* be, we'll return what they actually are.  this will also
+        // tell us if the file actually exists.
+        // incidentally, SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
+        $packet = pack('Na*', strlen($filename), $filename);
+        $this->send_sftp_packet(NET_SFTP_STAT, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_ATTRS:
+                $attrs = $this->parseAttributes($response);
+                return $attrs['mode'];
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                return false;
+        }
+
+        throw new \UnexpectedValueException('Expected NET_SFTP_ATTRS or NET_SFTP_STATUS. '
+                                          . 'Got packet type: ' . $this->packet_type);
+    }
+
+    /**
+     * Sets information about a file
+     *
+     * @param string $filename
+     * @param string $attr
+     * @param bool $recursive
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    private function setstat($filename, $attr, $recursive)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $filename = $this->realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        $this->remove_from_stat_cache($filename);
+
+        if ($recursive) {
+            $i = 0;
+            $result = $this->setstat_recursive($filename, $attr, $i);
+            $this->read_put_responses($i);
+            return $result;
+        }
+
+        $packet = Strings::packSSH2('s', $filename);
+        $packet .= $this->version >= 4 ?
+            pack('a*Ca*', substr($attr, 0, 4), NET_SFTP_TYPE_UNKNOWN, substr($attr, 4)) :
+            $attr;
+        $this->send_sftp_packet(NET_SFTP_SETSTAT, $packet);
+
+        /*
+         "Because some systems must use separate system calls to set various attributes, it is possible that a failure
+          response will be returned, but yet some of the attributes may be have been successfully modified.  If possible,
+          servers SHOULD avoid this situation; however, clients MUST be aware that this is possible."
+
+          -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.6
+        */
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Recursively sets information on directories on the SFTP server
+     *
+     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
+     *
+     * @param string $path
+     * @param string $attr
+     * @param int $i
+     * @return bool
+     */
+    private function setstat_recursive($path, $attr, &$i)
+    {
+        if (!$this->read_put_responses($i)) {
+            return false;
+        }
+        $i = 0;
+        $entries = $this->readlist($path, true);
+
+        if ($entries === false || is_int($entries)) {
+            return $this->setstat($path, $attr, false);
+        }
+
+        // normally $entries would have at least . and .. but it might not if the directories
+        // permissions didn't allow reading
+        if (empty($entries)) {
+            return false;
+        }
+
+        unset($entries['.'], $entries['..']);
+        foreach ($entries as $filename => $props) {
+            if (!isset($props['type'])) {
+                return false;
+            }
+
+            $temp = $path . '/' . $filename;
+            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                if (!$this->setstat_recursive($temp, $attr, $i)) {
+                    return false;
+                }
+            } else {
+                $packet = Strings::packSSH2('s', $temp);
+                $packet .= $this->version >= 4 ?
+                    pack('Ca*', NET_SFTP_TYPE_UNKNOWN, $attr) :
+                    $attr;
+                $this->send_sftp_packet(NET_SFTP_SETSTAT, $packet);
+
+                $i++;
+
+                if ($i >= NET_SFTP_QUEUE_SIZE) {
+                    if (!$this->read_put_responses($i)) {
+                        return false;
+                    }
+                    $i = 0;
+                }
+            }
+        }
+
+        $packet = Strings::packSSH2('s', $path);
+        $packet .= $this->version >= 4 ?
+            pack('Ca*', NET_SFTP_TYPE_UNKNOWN, $attr) :
+            $attr;
+        $this->send_sftp_packet(NET_SFTP_SETSTAT, $packet);
+
+        $i++;
+
+        if ($i >= NET_SFTP_QUEUE_SIZE) {
+            if (!$this->read_put_responses($i)) {
+                return false;
+            }
+            $i = 0;
+        }
+
+        return true;
+    }
+
+    /**
+     * Return the target of a symbolic link
+     *
+     * @param string $link
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return mixed
+     */
+    public function readlink($link)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $link = $this->realpath($link);
+
+        $this->send_sftp_packet(NET_SFTP_READLINK, Strings::packSSH2('s', $link));
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_NAME:
+                break;
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_NAME or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($count) = Strings::unpackSSH2('N', $response);
+        // the file isn't a symlink
+        if (!$count) {
+            return false;
+        }
+
+        list($filename) = Strings::unpackSSH2('s', $response);
+
+        return $filename;
+    }
+
+    /**
+     * Create a symlink
+     *
+     * symlink() creates a symbolic link to the existing target with the specified name link.
+     *
+     * @param string $target
+     * @param string $link
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    public function symlink($target, $link)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        //$target = $this->realpath($target);
+        $link = $this->realpath($link);
+
+        /* quoting https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-09#section-12.1 :
+
+           Changed the SYMLINK packet to be LINK and give it the ability to
+           create hard links.  Also change it's packet number because many
+           implementation implemented SYMLINK with the arguments reversed.
+           Hopefully the new argument names make it clear which way is which.
+        */
+        if ($this->version == 6) {
+            $type = NET_SFTP_LINK;
+            $packet = Strings::packSSH2('ssC', $link, $target, 1);
+        } else {
+            $type = NET_SFTP_SYMLINK;
+            /* quoting http://bxr.su/OpenBSD/usr.bin/ssh/PROTOCOL#347 :
+
+               3.1. sftp: Reversal of arguments to SSH_FXP_SYMLINK
+
+               When OpenSSH's sftp-server was implemented, the order of the arguments
+               to the SSH_FXP_SYMLINK method was inadvertently reversed. Unfortunately,
+               the reversal was not noticed until the server was widely deployed. Since
+               fixing this to follow the specification would cause incompatibility, the
+               current order was retained. For correct operation, clients should send
+               SSH_FXP_SYMLINK as follows:
+
+                   uint32      id
+                   string      targetpath
+                   string      linkpath */
+            $packet = substr($this->server_identifier, 0, 15) == 'SSH-2.0-OpenSSH' ?
+                Strings::packSSH2('ss', $target, $link) :
+                Strings::packSSH2('ss', $link, $target);
+        }
+        $this->send_sftp_packet($type, $packet);
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Creates a directory.
+     *
+     * @param string $dir
+     * @param int $mode
+     * @param bool $recursive
+     * @return bool
+     */
+    public function mkdir($dir, $mode = -1, $recursive = false)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $dir = $this->realpath($dir);
+
+        if ($recursive) {
+            $dirs = explode('/', preg_replace('#/(?=/)|/$#', '', $dir));
+            if (empty($dirs[0])) {
+                array_shift($dirs);
+                $dirs[0] = '/' . $dirs[0];
+            }
+            for ($i = 0; $i < count($dirs); $i++) {
+                $temp = array_slice($dirs, 0, $i + 1);
+                $temp = implode('/', $temp);
+                $result = $this->mkdir_helper($temp, $mode);
+            }
+            return $result;
+        }
+
+        return $this->mkdir_helper($dir, $mode);
+    }
+
+    /**
+     * Helper function for directory creation
+     *
+     * @param string $dir
+     * @param int $mode
+     * @return bool
+     */
+    private function mkdir_helper($dir, $mode)
+    {
+        // send SSH_FXP_MKDIR without any attributes (that's what the \0\0\0\0 is doing)
+        $this->send_sftp_packet(NET_SFTP_MKDIR, Strings::packSSH2('s', $dir) . "\0\0\0\0");
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        if ($mode !== -1) {
+            $this->chmod($mode, $dir);
+        }
+
+        return true;
+    }
+
+    /**
+     * Removes a directory.
+     *
+     * @param string $dir
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return bool
+     */
+    public function rmdir($dir)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $dir = $this->realpath($dir);
+        if ($dir === false) {
+            return false;
+        }
+
+        $this->send_sftp_packet(NET_SFTP_RMDIR, Strings::packSSH2('s', $dir));
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED?
+            $this->logError($response, $status);
+            return false;
+        }
+
+        $this->remove_from_stat_cache($dir);
+        // the following will do a soft delete, which would be useful if you deleted a file
+        // and then tried to do a stat on the deleted file. the above, in contrast, does
+        // a hard delete
+        //$this->update_stat_cache($dir, false);
+
+        return true;
+    }
+
+    /**
+     * Uploads a file to the SFTP server.
+     *
+     * By default, \phpseclib3\Net\SFTP::put() does not read from the local filesystem.  $data is dumped directly into $remote_file.
+     * So, for example, if you set $data to 'filename.ext' and then do \phpseclib3\Net\SFTP::get(), you will get a file, twelve bytes
+     * long, containing 'filename.ext' as its contents.
+     *
+     * Setting $mode to self::SOURCE_LOCAL_FILE will change the above behavior.  With self::SOURCE_LOCAL_FILE, $remote_file will
+     * contain as many bytes as filename.ext does on your local filesystem.  If your filename.ext is 1MB then that is how
+     * large $remote_file will be, as well.
+     *
+     * Setting $mode to self::SOURCE_CALLBACK will use $data as callback function, which gets only one parameter -- number
+     * of bytes to return, and returns a string if there is some data or null if there is no more data
+     *
+     * If $data is a resource then it'll be used as a resource instead.
+     *
+     * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
+     * care of that, yourself.
+     *
+     * $mode can take an additional two parameters - self::RESUME and self::RESUME_START. These are bitwise AND'd with
+     * $mode. So if you want to resume upload of a 300mb file on the local file system you'd set $mode to the following:
+     *
+     * self::SOURCE_LOCAL_FILE | self::RESUME
+     *
+     * If you wanted to simply append the full contents of a local file to the full contents of a remote file you'd replace
+     * self::RESUME with self::RESUME_START.
+     *
+     * If $mode & (self::RESUME | self::RESUME_START) then self::RESUME_START will be assumed.
+     *
+     * $start and $local_start give you more fine grained control over this process and take precident over self::RESUME
+     * when they're non-negative. ie. $start could let you write at the end of a file (like self::RESUME) or in the middle
+     * of one. $local_start could let you start your reading from the end of a file (like self::RESUME_START) or in the
+     * middle of one.
+     *
+     * Setting $local_start to > 0 or $mode | self::RESUME_START doesn't do anything unless $mode | self::SOURCE_LOCAL_FILE.
+     *
+     * {@internal ASCII mode for SFTPv4/5/6 can be supported by adding a new function - \phpseclib3\Net\SFTP::setMode().}
+     *
+     * @param string $remote_file
+     * @param string|resource $data
+     * @param int $mode
+     * @param int $start
+     * @param int $local_start
+     * @param callable|null $progressCallback
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @throws \BadFunctionCallException if you're uploading via a callback and the callback function is invalid
+     * @throws FileNotFoundException if you're uploading via a file and the file doesn't exist
+     * @return bool
+     */
+    public function put($remote_file, $data, $mode = self::SOURCE_STRING, $start = -1, $local_start = -1, $progressCallback = null)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $remote_file = $this->realpath($remote_file);
+        if ($remote_file === false) {
+            return false;
+        }
+
+        $this->remove_from_stat_cache($remote_file);
+
+        if ($this->version >= 5) {
+            $flags = NET_SFTP_OPEN_OPEN_OR_CREATE;
+        } else {
+            $flags = NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE;
+            // according to the SFTP specs, NET_SFTP_OPEN_APPEND should "force all writes to append data at the end of the file."
+            // in practice, it doesn't seem to do that.
+            //$flags|= ($mode & self::RESUME) ? NET_SFTP_OPEN_APPEND : NET_SFTP_OPEN_TRUNCATE;
+        }
+
+        if ($start >= 0) {
+            $offset = $start;
+        } elseif ($mode & (self::RESUME | self::RESUME_START)) {
+            // if NET_SFTP_OPEN_APPEND worked as it should _size() wouldn't need to be called
+            $stat = $this->stat($remote_file);
+            $offset = $stat !== false && $stat['size'] ? $stat['size'] : 0;
+        } else {
+            $offset = 0;
+            if ($this->version >= 5) {
+                $flags = NET_SFTP_OPEN_CREATE_TRUNCATE;
+            } else {
+                $flags |= NET_SFTP_OPEN_TRUNCATE;
+            }
+        }
+
+        $this->remove_from_stat_cache($remote_file);
+
+        $packet = Strings::packSSH2('s', $remote_file);
+        $packet .= $this->version >= 5 ?
+            pack('N3', 0, $flags, 0) :
+            pack('N2', $flags, 0);
+        $this->send_sftp_packet(NET_SFTP_OPEN, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                $this->logError($response);
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.3
+        $dataCallback = false;
+        switch (true) {
+            case $mode & self::SOURCE_CALLBACK:
+                if (!is_callable($data)) {
+                    throw new \BadFunctionCallException("\$data should be is_callable() if you specify SOURCE_CALLBACK flag");
+                }
+                $dataCallback = $data;
+                // do nothing
+                break;
+            case is_resource($data):
+                $mode = $mode & ~self::SOURCE_LOCAL_FILE;
+                $info = stream_get_meta_data($data);
+                if (isset($info['wrapper_type']) && $info['wrapper_type'] == 'PHP' && $info['stream_type'] == 'Input') {
+                    $fp = fopen('php://memory', 'w+');
+                    stream_copy_to_stream($data, $fp);
+                    rewind($fp);
+                } else {
+                    $fp = $data;
+                }
+                break;
+            case $mode & self::SOURCE_LOCAL_FILE:
+                if (!is_file($data)) {
+                    throw new FileNotFoundException("$data is not a valid file");
+                }
+                $fp = @fopen($data, 'rb');
+                if (!$fp) {
+                    return false;
+                }
+        }
+
+        if (isset($fp)) {
+            $stat = fstat($fp);
+            $size = !empty($stat) ? $stat['size'] : 0;
+
+            if ($local_start >= 0) {
+                fseek($fp, $local_start);
+                $size -= $local_start;
+            } elseif ($mode & self::RESUME) {
+                fseek($fp, $offset);
+                $size -= $offset;
+            }
+        } elseif ($dataCallback) {
+            $size = 0;
+        } else {
+            $size = strlen($data);
+        }
+
+        $sent = 0;
+        $size = $size < 0 ? ($size & 0x7FFFFFFF) + 0x80000000 : $size;
+
+        $sftp_packet_size = $this->max_sftp_packet;
+        // make the SFTP packet be exactly the SFTP packet size by including the bytes in the NET_SFTP_WRITE packets "header"
+        $sftp_packet_size -= strlen($handle) + 25;
+        $i = $j = 0;
+        while ($dataCallback || ($size === 0 || $sent < $size)) {
+            if ($dataCallback) {
+                $temp = $dataCallback($sftp_packet_size);
+                if (is_null($temp)) {
+                    break;
+                }
+            } else {
+                $temp = isset($fp) ? fread($fp, $sftp_packet_size) : substr($data, $sent, $sftp_packet_size);
+                if ($temp === false || $temp === '') {
+                    break;
+                }
+            }
+
+            $subtemp = $offset + $sent;
+            $packet = pack('Na*N3a*', strlen($handle), $handle, $subtemp / 4294967296, $subtemp, strlen($temp), $temp);
+            try {
+                $this->send_sftp_packet(NET_SFTP_WRITE, $packet, $j);
+            } catch (\Exception $e) {
+                if ($mode & self::SOURCE_LOCAL_FILE) {
+                    fclose($fp);
+                }
+                throw $e;
+            }
+            $sent += strlen($temp);
+            if (is_callable($progressCallback)) {
+                $progressCallback($sent);
+            }
+
+            $i++;
+            $j++;
+            if ($i == NET_SFTP_UPLOAD_QUEUE_SIZE) {
+                if (!$this->read_put_responses($i)) {
+                    $i = 0;
+                    break;
+                }
+                $i = 0;
+            }
+        }
+
+        $result = $this->close_handle($handle);
+
+        if (!$this->read_put_responses($i)) {
+            if ($mode & self::SOURCE_LOCAL_FILE) {
+                fclose($fp);
+            }
+            $this->close_handle($handle);
+            return false;
+        }
+
+        if ($mode & SFTP::SOURCE_LOCAL_FILE) {
+            if (isset($fp) && is_resource($fp)) {
+                fclose($fp);
+            }
+
+            if ($this->preserveTime) {
+                $stat = stat($data);
+                $attr = $this->version < 4 ?
+                    pack('N3', NET_SFTP_ATTR_ACCESSTIME, $stat['atime'], $stat['mtime']) :
+                    Strings::packSSH2('NQ2', NET_SFTP_ATTR_ACCESSTIME | NET_SFTP_ATTR_MODIFYTIME, $stat['atime'], $stat['mtime']);
+                if (!$this->setstat($remote_file, $attr, false)) {
+                    throw new \RuntimeException('Error setting file time');
+                }
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Reads multiple successive SSH_FXP_WRITE responses
+     *
+     * Sending an SSH_FXP_WRITE packet and immediately reading its response isn't as efficient as blindly sending out $i
+     * SSH_FXP_WRITEs, in succession, and then reading $i responses.
+     *
+     * @param int $i
+     * @return bool
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     */
+    private function read_put_responses($i)
+    {
+        while ($i--) {
+            $response = $this->get_sftp_packet();
+            if ($this->packet_type != NET_SFTP_STATUS) {
+                throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+            }
+
+            list($status) = Strings::unpackSSH2('N', $response);
+            if ($status != NET_SFTP_STATUS_OK) {
+                $this->logError($response, $status);
+                break;
+            }
+        }
+
+        return $i < 0;
+    }
+
+    /**
+     * Close handle
+     *
+     * @param string $handle
+     * @return bool
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     */
+    private function close_handle($handle)
+    {
+        $this->send_sftp_packet(NET_SFTP_CLOSE, pack('Na*', strlen($handle), $handle));
+
+        // "The client MUST release all resources associated with the handle regardless of the status."
+        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.3
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Downloads a file from the SFTP server.
+     *
+     * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
+     * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
+     * operation.
+     *
+     * $offset and $length can be used to download files in chunks.
+     *
+     * @param string $remote_file
+     * @param string|bool|resource|callable $local_file
+     * @param int $offset
+     * @param int $length
+     * @param callable|null $progressCallback
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @return string|bool
+     */
+    public function get($remote_file, $local_file = false, $offset = 0, $length = -1, $progressCallback = null)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $remote_file = $this->realpath($remote_file);
+        if ($remote_file === false) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2('s', $remote_file);
+        $packet .= $this->version >= 5 ?
+            pack('N3', 0, NET_SFTP_OPEN_OPEN_EXISTING, 0) :
+            pack('N2', NET_SFTP_OPEN_READ, 0);
+        $this->send_sftp_packet(NET_SFTP_OPEN, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                $this->logError($response);
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+
+        if (is_resource($local_file)) {
+            $fp = $local_file;
+            $stat = fstat($fp);
+            $res_offset = $stat['size'];
+        } else {
+            $res_offset = 0;
+            if ($local_file !== false && !is_callable($local_file)) {
+                $fp = fopen($local_file, 'wb');
+                if (!$fp) {
+                    return false;
+                }
+            } else {
+                $content = '';
+            }
+        }
+
+        $fclose_check = $local_file !== false && !is_callable($local_file) && !is_resource($local_file);
+
+        $start = $offset;
+        $read = 0;
+        while (true) {
+            $i = 0;
+
+            while ($i < NET_SFTP_QUEUE_SIZE && ($length < 0 || $read < $length)) {
+                $tempoffset = $start + $read;
+
+                $packet_size = $length > 0 ? min($this->max_sftp_packet, $length - $read) : $this->max_sftp_packet;
+
+                $packet = Strings::packSSH2('sN3', $handle, $tempoffset / 4294967296, $tempoffset, $packet_size);
+                try {
+                    $this->send_sftp_packet(NET_SFTP_READ, $packet, $i);
+                } catch (\Exception $e) {
+                    if ($fclose_check) {
+                        fclose($fp);
+                    }
+                    throw $e;
+                }
+                $packet = null;
+                $read += $packet_size;
+                $i++;
+            }
+
+            if (!$i) {
+                break;
+            }
+
+            $packets_sent = $i - 1;
+
+            $clear_responses = false;
+            while ($i > 0) {
+                $i--;
+
+                if ($clear_responses) {
+                    $this->get_sftp_packet($packets_sent - $i);
+                    continue;
+                } else {
+                    $response = $this->get_sftp_packet($packets_sent - $i);
+                }
+
+                switch ($this->packet_type) {
+                    case NET_SFTP_DATA:
+                        $temp = substr($response, 4);
+                        $offset += strlen($temp);
+                        if ($local_file === false) {
+                            $content .= $temp;
+                        } elseif (is_callable($local_file)) {
+                            $local_file($temp);
+                        } else {
+                            fputs($fp, $temp);
+                        }
+                        if (is_callable($progressCallback)) {
+                            call_user_func($progressCallback, $offset);
+                        }
+                        $temp = null;
+                        break;
+                    case NET_SFTP_STATUS:
+                        // could, in theory, return false if !strlen($content) but we'll hold off for the time being
+                        $this->logError($response);
+                        $clear_responses = true; // don't break out of the loop yet, so we can read the remaining responses
+                        break;
+                    default:
+                        if ($fclose_check) {
+                            fclose($fp);
+                        }
+                        if ($this->channel_close) {
+                            $this->partial_init = false;
+                            $this->init_sftp_connection();
+                            return false;
+                        } else {
+                            throw new \UnexpectedValueException('Expected NET_SFTP_DATA or NET_SFTP_STATUS. '
+                                                              . 'Got packet type: ' . $this->packet_type);
+                        }
+                }
+                $response = null;
+            }
+
+            if ($clear_responses) {
+                break;
+            }
+        }
+
+        if ($fclose_check) {
+            fclose($fp);
+
+            if ($this->preserveTime) {
+                $stat = $this->stat($remote_file);
+                touch($local_file, $stat['mtime'], $stat['atime']);
+            }
+        }
+
+        if (!$this->close_handle($handle)) {
+            return false;
+        }
+
+        // if $content isn't set that means a file was written to
+        return isset($content) ? $content : true;
+    }
+
+    /**
+     * Deletes a file on the SFTP server.
+     *
+     * @param string $path
+     * @param bool $recursive
+     * @return bool
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     */
+    public function delete($path, $recursive = true)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        if (is_object($path)) {
+            // It's an object. Cast it as string before we check anything else.
+            $path = (string) $path;
+        }
+
+        if (!is_string($path) || $path == '') {
+            return false;
+        }
+
+        $path = $this->realpath($path);
+        if ($path === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
+        $this->send_sftp_packet(NET_SFTP_REMOVE, pack('Na*', strlen($path), $path));
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            if (!$recursive) {
+                return false;
+            }
+
+            $i = 0;
+            $result = $this->delete_recursive($path, $i);
+            $this->read_put_responses($i);
+            return $result;
+        }
+
+        $this->remove_from_stat_cache($path);
+
+        return true;
+    }
+
+    /**
+     * Recursively deletes directories on the SFTP server
+     *
+     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
+     *
+     * @param string $path
+     * @param int $i
+     * @return bool
+     */
+    private function delete_recursive($path, &$i)
+    {
+        if (!$this->read_put_responses($i)) {
+            return false;
+        }
+        $i = 0;
+        $entries = $this->readlist($path, true);
+
+        // The folder does not exist at all, so we cannot delete it.
+        if ($entries === NET_SFTP_STATUS_NO_SUCH_FILE) {
+            return false;
+        }
+
+        // Normally $entries would have at least . and .. but it might not if the directories
+        // permissions didn't allow reading. If this happens then default to an empty list of files.
+        if ($entries === false || is_int($entries)) {
+            $entries = [];
+        }
+
+        unset($entries['.'], $entries['..']);
+        foreach ($entries as $filename => $props) {
+            if (!isset($props['type'])) {
+                return false;
+            }
+
+            $temp = $path . '/' . $filename;
+            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                if (!$this->delete_recursive($temp, $i)) {
+                    return false;
+                }
+            } else {
+                $this->send_sftp_packet(NET_SFTP_REMOVE, Strings::packSSH2('s', $temp));
+                $this->remove_from_stat_cache($temp);
+
+                $i++;
+
+                if ($i >= NET_SFTP_QUEUE_SIZE) {
+                    if (!$this->read_put_responses($i)) {
+                        return false;
+                    }
+                    $i = 0;
+                }
+            }
+        }
+
+        $this->send_sftp_packet(NET_SFTP_RMDIR, Strings::packSSH2('s', $path));
+        $this->remove_from_stat_cache($path);
+
+        $i++;
+
+        if ($i >= NET_SFTP_QUEUE_SIZE) {
+            if (!$this->read_put_responses($i)) {
+                return false;
+            }
+            $i = 0;
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks whether a file or directory exists
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function file_exists($path)
+    {
+        if ($this->use_stat_cache) {
+            if (!$this->precheck()) {
+                return false;
+            }
+
+            $path = $this->realpath($path);
+
+            $result = $this->query_stat_cache($path);
+
+            if (isset($result)) {
+                // return true if $result is an array or if it's an stdClass object
+                return $result !== false;
+            }
+        }
+
+        return $this->stat($path) !== false;
+    }
+
+    /**
+     * Tells whether the filename is a directory
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_dir($path)
+    {
+        $result = $this->get_stat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_DIRECTORY;
+    }
+
+    /**
+     * Tells whether the filename is a regular file
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_file($path)
+    {
+        $result = $this->get_stat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_REGULAR;
+    }
+
+    /**
+     * Tells whether the filename is a symbolic link
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_link($path)
+    {
+        $result = $this->get_lstat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_SYMLINK;
+    }
+
+    /**
+     * Tells whether a file exists and is readable
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_readable($path)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2('sNN', $this->realpath($path), NET_SFTP_OPEN_READ, 0);
+        $this->send_sftp_packet(NET_SFTP_OPEN, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return true;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected NET_SFTP_HANDLE or NET_SFTP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+    }
+
+    /**
+     * Tells whether the filename is writable
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_writable($path)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2('sNN', $this->realpath($path), NET_SFTP_OPEN_WRITE, 0);
+        $this->send_sftp_packet(NET_SFTP_OPEN, $packet);
+
+        $response = $this->get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return true;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                return false;
+            default:
+                throw new \UnexpectedValueException('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS. '
+                                                  . 'Got packet type: ' . $this->packet_type);
+        }
+    }
+
+    /**
+     * Tells whether the filename is writeable
+     *
+     * Alias of is_writable
+     *
+     * @param string $path
+     * @return bool
+     */
+    public function is_writeable($path)
+    {
+        return $this->is_writable($path);
+    }
+
+    /**
+     * Gets last access time of file
+     *
+     * @param string $path
+     * @return mixed
+     */
+    public function fileatime($path)
+    {
+        return $this->get_stat_cache_prop($path, 'atime');
+    }
+
+    /**
+     * Gets file modification time
+     *
+     * @param string $path
+     * @return mixed
+     */
+    public function filemtime($path)
+    {
+        return $this->get_stat_cache_prop($path, 'mtime');
+    }
+
+    /**
+     * Gets file permissions
+     *
+     * @param string $path
+     * @return mixed
+     */
+    public function fileperms($path)
+    {
+        return $this->get_stat_cache_prop($path, 'mode');
+    }
+
+    /**
+     * Gets file owner
+     *
+     * @param string $path
+     * @return mixed
+     */
+    public function fileowner($path)
+    {
+        return $this->get_stat_cache_prop($path, 'uid');
+    }
+
+    /**
+     * Gets file group
+     *
+     * @param string $path
+     * @return mixed
+     */
+    public function filegroup($path)
+    {
+        return $this->get_stat_cache_prop($path, 'gid');
+    }
+
+    /**
+     * Recursively go through rawlist() output to get the total filesize
+     *
+     * @return int
+     */
+    private static function recursiveFilesize(array $files)
+    {
+        $size = 0;
+        foreach ($files as $name => $file) {
+            if ($name == '.' || $name == '..') {
+                continue;
+            }
+            $size += is_array($file) ?
+                self::recursiveFilesize($file) :
+                $file->size;
+        }
+        return $size;
+    }
+
+    /**
+     * Gets file size
+     *
+     * @param string $path
+     * @param bool $recursive
+     * @return mixed
+     */
+    public function filesize($path, $recursive = false)
+    {
+        return !$recursive || $this->filetype($path) != 'dir' ?
+            $this->get_stat_cache_prop($path, 'size') :
+            self::recursiveFilesize($this->rawlist($path, true));
+    }
+
+    /**
+     * Gets file type
+     *
+     * @param string $path
+     * @return string|false
+     */
+    public function filetype($path)
+    {
+        $type = $this->get_stat_cache_prop($path, 'type');
+        if ($type === false) {
+            return false;
+        }
+
+        switch ($type) {
+            case NET_SFTP_TYPE_BLOCK_DEVICE:
+                return 'block';
+            case NET_SFTP_TYPE_CHAR_DEVICE:
+                return 'char';
+            case NET_SFTP_TYPE_DIRECTORY:
+                return 'dir';
+            case NET_SFTP_TYPE_FIFO:
+                return 'fifo';
+            case NET_SFTP_TYPE_REGULAR:
+                return 'file';
+            case NET_SFTP_TYPE_SYMLINK:
+                return 'link';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Return a stat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @return mixed
+     */
+    private function get_stat_cache_prop($path, $prop)
+    {
+        return $this->get_xstat_cache_prop($path, $prop, 'stat');
+    }
+
+    /**
+     * Return an lstat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @return mixed
+     */
+    private function get_lstat_cache_prop($path, $prop)
+    {
+        return $this->get_xstat_cache_prop($path, $prop, 'lstat');
+    }
+
+    /**
+     * Return a stat or lstat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @param string $type
+     * @return mixed
+     */
+    private function get_xstat_cache_prop($path, $prop, $type)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        if ($this->use_stat_cache) {
+            $path = $this->realpath($path);
+
+            $result = $this->query_stat_cache($path);
+
+            if (is_object($result) && isset($result->$type)) {
+                return $result->{$type}[$prop];
+            }
+        }
+
+        $result = $this->$type($path);
+
+        if ($result === false || !isset($result[$prop])) {
+            return false;
+        }
+
+        return $result[$prop];
+    }
+
+    /**
+     * Renames a file or a directory on the SFTP server.
+     *
+     * If the file already exists this will return false
+     *
+     * @param string $oldname
+     * @param string $newname
+     * @return bool
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     */
+    public function rename($oldname, $newname)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $oldname = $this->realpath($oldname);
+        $newname = $this->realpath($newname);
+        if ($oldname === false || $newname === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
+        $packet = Strings::packSSH2('ss', $oldname, $newname);
+        if ($this->version >= 5) {
+            /* quoting https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-05#section-6.5 ,
+
+               'flags' is 0 or a combination of:
+
+                   SSH_FXP_RENAME_OVERWRITE  0x00000001
+                   SSH_FXP_RENAME_ATOMIC     0x00000002
+                   SSH_FXP_RENAME_NATIVE     0x00000004
+
+               (none of these are currently supported) */
+            $packet .= "\0\0\0\0";
+        }
+        $this->send_sftp_packet(NET_SFTP_RENAME, $packet);
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        // don't move the stat cache entry over since this operation could very well change the
+        // atime and mtime attributes
+        //$this->update_stat_cache($newname, $this->query_stat_cache($oldname));
+        $this->remove_from_stat_cache($oldname);
+        $this->remove_from_stat_cache($newname);
+
+        return true;
+    }
+
+    /**
+     * Parse Time
+     *
+     * See '7.7.  Times' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * @param string $key
+     * @param int $flags
+     * @param string $response
+     * @return array
+     */
+    private function parseTime($key, $flags, &$response)
+    {
+        $attr = [];
+        list($attr[$key]) = Strings::unpackSSH2('Q', $response);
+        if ($flags & NET_SFTP_ATTR_SUBSECOND_TIMES) {
+            list($attr[$key . '-nseconds']) = Strings::unpackSSH2('N', $response);
+        }
+        return $attr;
+    }
+
+    /**
+     * Parse Attributes
+     *
+     * See '7.  File Attributes' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * @param string $response
+     * @return array
+     */
+    protected function parseAttributes(&$response)
+    {
+        if ($this->version >= 4) {
+            list($flags, $attr['type']) = Strings::unpackSSH2('NC', $response);
+        } else {
+            list($flags) = Strings::unpackSSH2('N', $response);
+        }
+
+        foreach (self::$attributes as $key => $value) {
+            switch ($flags & $key) {
+                case NET_SFTP_ATTR_UIDGID:
+                    if ($this->version > 3) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_CREATETIME:
+                case NET_SFTP_ATTR_MODIFYTIME:
+                case NET_SFTP_ATTR_ACL:
+                case NET_SFTP_ATTR_OWNERGROUP:
+                case NET_SFTP_ATTR_SUBSECOND_TIMES:
+                    if ($this->version < 4) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_BITS:
+                    if ($this->version < 5) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_ALLOCATION_SIZE:
+                case NET_SFTP_ATTR_TEXT_HINT:
+                case NET_SFTP_ATTR_MIME_TYPE:
+                case NET_SFTP_ATTR_LINK_COUNT:
+                case NET_SFTP_ATTR_UNTRANSLATED_NAME:
+                case NET_SFTP_ATTR_CTIME:
+                    if ($this->version < 6) {
+                        continue 2;
+                    }
+            }
+            switch ($flags & $key) {
+                case NET_SFTP_ATTR_SIZE:             // 0x00000001
+                    // The size attribute is defined as an unsigned 64-bit integer.
+                    // The following will use floats on 32-bit platforms, if necessary.
+                    // As can be seen in the BigInteger class, floats are generally
+                    // IEEE 754 binary64 "double precision" on such platforms and
+                    // as such can represent integers of at least 2^50 without loss
+                    // of precision. Interpreted in filesize, 2^50 bytes = 1024 TiB.
+                    list($attr['size']) = Strings::unpackSSH2('Q', $response);
+                    break;
+                case NET_SFTP_ATTR_UIDGID: // 0x00000002 (SFTPv3 only)
+                    list($attr['uid'], $attr['gid']) = Strings::unpackSSH2('NN', $response);
+                    break;
+                case NET_SFTP_ATTR_PERMISSIONS: // 0x00000004
+                    list($attr['mode']) = Strings::unpackSSH2('N', $response);
+                    $fileType = $this->parseMode($attr['mode']);
+                    if ($this->version < 4 && $fileType !== false) {
+                        $attr += ['type' => $fileType];
+                    }
+                    break;
+                case NET_SFTP_ATTR_ACCESSTIME: // 0x00000008
+                    if ($this->version >= 4) {
+                        $attr += $this->parseTime('atime', $flags, $response);
+                        break;
+                    }
+                    list($attr['atime'], $attr['mtime']) = Strings::unpackSSH2('NN', $response);
+                    break;
+                case NET_SFTP_ATTR_CREATETIME:       // 0x00000010 (SFTPv4+)
+                    $attr += $this->parseTime('createtime', $flags, $response);
+                    break;
+                case NET_SFTP_ATTR_MODIFYTIME:       // 0x00000020
+                    $attr += $this->parseTime('mtime', $flags, $response);
+                    break;
+                case NET_SFTP_ATTR_ACL:              // 0x00000040
+                    // access control list
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-04#section-5.7
+                    // currently unsupported
+                    list($count) = Strings::unpackSSH2('N', $response);
+                    for ($i = 0; $i < $count; $i++) {
+                        list($type, $flag, $mask, $who) = Strings::unpackSSH2('N3s', $result);
+                    }
+                    break;
+                case NET_SFTP_ATTR_OWNERGROUP:       // 0x00000080
+                    list($attr['owner'], $attr['$group']) = Strings::unpackSSH2('ss', $response);
+                    break;
+                case NET_SFTP_ATTR_SUBSECOND_TIMES:  // 0x00000100
+                    break;
+                case NET_SFTP_ATTR_BITS:             // 0x00000200 (SFTPv5+)
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-05#section-5.8
+                    // currently unsupported
+                    // tells if you file is:
+                    // readonly, system, hidden, case inensitive, archive, encrypted, compressed, sparse
+                    // append only, immutable, sync
+                    list($attrib_bits, $attrib_bits_valid) = Strings::unpackSSH2('N2', $response);
+                    // if we were actually gonna implement the above it ought to be
+                    // $attr['attrib-bits'] and $attr['attrib-bits-valid']
+                    // eg. - instead of _
+                    break;
+                case NET_SFTP_ATTR_ALLOCATION_SIZE:  // 0x00000400 (SFTPv6+)
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.4
+                    // represents the number of bytes that the file consumes on the disk. will
+                    // usually be larger than the 'size' field
+                    list($attr['allocation-size']) = Strings::unpackSSH2('Q', $response);
+                    break;
+                case NET_SFTP_ATTR_TEXT_HINT:        // 0x00000800
+                    // https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.10
+                    // currently unsupported
+                    // tells if file is "known text", "guessed text", "known binary", "guessed binary"
+                    list($text_hint) = Strings::unpackSSH2('C', $response);
+                    // the above should be $attr['text-hint']
+                    break;
+                case NET_SFTP_ATTR_MIME_TYPE:        // 0x00001000
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.11
+                    list($attr['mime-type']) = Strings::unpackSSH2('s', $response);
+                    break;
+                case NET_SFTP_ATTR_LINK_COUNT:       // 0x00002000
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.12
+                    list($attr['link-count']) = Strings::unpackSSH2('N', $response);
+                    break;
+                case NET_SFTP_ATTR_UNTRANSLATED_NAME:// 0x00004000
+                    // see https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-13#section-7.13
+                    list($attr['untranslated-name']) = Strings::unpackSSH2('s', $response);
+                    break;
+                case NET_SFTP_ATTR_CTIME:            // 0x00008000
+                    // 'ctime' contains the last time the file attributes were changed.  The
+                    // exact meaning of this field depends on the server.
+                    $attr += $this->parseTime('ctime', $flags, $response);
+                    break;
+                case NET_SFTP_ATTR_EXTENDED: // 0x80000000
+                    list($count) = Strings::unpackSSH2('N', $response);
+                    for ($i = 0; $i < $count; $i++) {
+                        list($key, $value) = Strings::unpackSSH2('ss', $response);
+                        $attr[$key] = $value;
+                    }
+            }
+        }
+        return $attr;
+    }
+
+    /**
+     * Attempt to identify the file type
+     *
+     * Quoting the SFTP RFC, "Implementations MUST NOT send bits that are not defined" but they seem to anyway
+     *
+     * @param int $mode
+     * @return int
+     */
+    private function parseMode($mode)
+    {
+        // values come from http://lxr.free-electrons.com/source/include/uapi/linux/stat.h#L12
+        // see, also, http://linux.die.net/man/2/stat
+        switch ($mode & 0170000) {// ie. 1111 0000 0000 0000
+            case 0000000: // no file type specified - figure out the file type using alternative means
+                return false;
+            case 0040000:
+                return NET_SFTP_TYPE_DIRECTORY;
+            case 0100000:
+                return NET_SFTP_TYPE_REGULAR;
+            case 0120000:
+                return NET_SFTP_TYPE_SYMLINK;
+            // new types introduced in SFTPv5+
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
+            case 0010000: // named pipe (fifo)
+                return NET_SFTP_TYPE_FIFO;
+            case 0020000: // character special
+                return NET_SFTP_TYPE_CHAR_DEVICE;
+            case 0060000: // block special
+                return NET_SFTP_TYPE_BLOCK_DEVICE;
+            case 0140000: // socket
+                return NET_SFTP_TYPE_SOCKET;
+            case 0160000: // whiteout
+                // "SPECIAL should be used for files that are of
+                //  a known type which cannot be expressed in the protocol"
+                return NET_SFTP_TYPE_SPECIAL;
+            default:
+                return NET_SFTP_TYPE_UNKNOWN;
+        }
+    }
+
+    /**
+     * Parse Longname
+     *
+     * SFTPv3 doesn't provide any easy way of identifying a file type.  You could try to open
+     * a file as a directory and see if an error is returned or you could try to parse the
+     * SFTPv3-specific longname field of the SSH_FXP_NAME packet.  That's what this function does.
+     * The result is returned using the
+     * {@link http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2 SFTPv4 type constants}.
+     *
+     * If the longname is in an unrecognized format bool(false) is returned.
+     *
+     * @param string $longname
+     * @return mixed
+     */
+    private function parseLongname($longname)
+    {
+        // http://en.wikipedia.org/wiki/Unix_file_types
+        // http://en.wikipedia.org/wiki/Filesystem_permissions#Notation_of_traditional_Unix_permissions
+        if (preg_match('#^[^/]([r-][w-][xstST-]){3}#', $longname)) {
+            switch ($longname[0]) {
+                case '-':
+                    return NET_SFTP_TYPE_REGULAR;
+                case 'd':
+                    return NET_SFTP_TYPE_DIRECTORY;
+                case 'l':
+                    return NET_SFTP_TYPE_SYMLINK;
+                default:
+                    return NET_SFTP_TYPE_SPECIAL;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Sends SFTP Packets
+     *
+     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * @param int $type
+     * @param string $data
+     * @param int $request_id
+     * @see self::_get_sftp_packet()
+     * @see self::send_channel_packet()
+     * @return void
+     */
+    private function send_sftp_packet($type, $data, $request_id = 1)
+    {
+        // in SSH2.php the timeout is cumulative per function call. eg. exec() will
+        // timeout after 10s. but for SFTP.php it's cumulative per packet
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+
+        $packet = $this->use_request_id ?
+            pack('NCNa*', strlen($data) + 5, $type, $request_id, $data) :
+            pack('NCa*', strlen($data) + 1, $type, $data);
+
+        $start = microtime(true);
+        $this->send_channel_packet(self::CHANNEL, $packet);
+        $stop = microtime(true);
+
+        if (defined('NET_SFTP_LOGGING')) {
+            $packet_type = '-> ' . self::$packet_types[$type] .
+                           ' (' . round($stop - $start, 4) . 's)';
+            $this->append_log($packet_type, $data);
+        }
+    }
+
+    /**
+     * Resets the SFTP channel for re-use
+     */
+    private function reset_sftp()
+    {
+        $this->use_request_id = false;
+        $this->pwd = false;
+        $this->requestBuffer = [];
+        $this->partial_init = false;
+    }
+
+    /**
+     * Resets a connection for re-use
+     */
+    protected function reset_connection()
+    {
+        parent::reset_connection();
+        $this->reset_sftp();
+    }
+
+    /**
+     * Receives SFTP Packets
+     *
+     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * Incidentally, the number of SSH_MSG_CHANNEL_DATA messages has no bearing on the number of SFTP packets present.
+     * There can be one SSH_MSG_CHANNEL_DATA messages containing two SFTP packets or there can be two SSH_MSG_CHANNEL_DATA
+     * messages containing one SFTP packet.
+     *
+     * @see self::_send_sftp_packet()
+     * @return string
+     */
+    private function get_sftp_packet($request_id = null)
+    {
+        $this->channel_close = false;
+
+        if (isset($request_id) && isset($this->requestBuffer[$request_id])) {
+            $this->packet_type = $this->requestBuffer[$request_id]['packet_type'];
+            $temp = $this->requestBuffer[$request_id]['packet'];
+            unset($this->requestBuffer[$request_id]);
+            return $temp;
+        }
+
+        // in SSH2.php the timeout is cumulative per function call. eg. exec() will
+        // timeout after 10s. but for SFTP.php it's cumulative per packet
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+
+        $start = microtime(true);
+
+        // SFTP packet length
+        while (strlen($this->packet_buffer) < 4) {
+            $temp = $this->get_channel_packet(self::CHANNEL, true);
+            if ($temp === true) {
+                if ($this->channel_status[self::CHANNEL] === NET_SSH2_MSG_CHANNEL_CLOSE) {
+                    $this->channel_close = true;
+                }
+                $this->packet_type = false;
+                $this->packet_buffer = '';
+                return false;
+            }
+            $this->packet_buffer .= $temp;
+        }
+        if (strlen($this->packet_buffer) < 4) {
+            throw new \RuntimeException('Packet is too small');
+        }
+        extract(unpack('Nlength', Strings::shift($this->packet_buffer, 4)));
+        /** @var integer $length */
+
+        $tempLength = $length;
+        $tempLength -= strlen($this->packet_buffer);
+
+        // 256 * 1024 is what SFTP_MAX_MSG_LENGTH is set to in OpenSSH's sftp-common.h
+        if (!$this->allow_arbitrary_length_packets && !$this->use_request_id && $tempLength > 256 * 1024) {
+            throw new \RuntimeException('Invalid Size');
+        }
+
+        // SFTP packet type and data payload
+        while ($tempLength > 0) {
+            $temp = $this->get_channel_packet(self::CHANNEL, true);
+            if ($temp === true) {
+                if ($this->channel_status[self::CHANNEL] === NET_SSH2_MSG_CHANNEL_CLOSE) {
+                    $this->channel_close = true;
+                }
+                $this->packet_type = false;
+                $this->packet_buffer = '';
+                return false;
+            }
+            $this->packet_buffer .= $temp;
+            $tempLength -= strlen($temp);
+        }
+
+        $stop = microtime(true);
+
+        $this->packet_type = ord(Strings::shift($this->packet_buffer));
+
+        if ($this->use_request_id) {
+            extract(unpack('Npacket_id', Strings::shift($this->packet_buffer, 4))); // remove the request id
+            $length -= 5; // account for the request id and the packet type
+        } else {
+            $length -= 1; // account for the packet type
+        }
+
+        $packet = Strings::shift($this->packet_buffer, $length);
+
+        if (defined('NET_SFTP_LOGGING')) {
+            $packet_type = '<- ' . self::$packet_types[$this->packet_type] .
+                           ' (' . round($stop - $start, 4) . 's)';
+            $this->append_log($packet_type, $packet);
+        }
+
+        if (isset($request_id) && $this->use_request_id && $packet_id != $request_id) {
+            $this->requestBuffer[$packet_id] = [
+                'packet_type' => $this->packet_type,
+                'packet' => $packet
+            ];
+            return $this->get_sftp_packet($request_id);
+        }
+
+        return $packet;
+    }
+
+    /**
+     * Logs data packets
+     *
+     * Makes sure that only the last 1MB worth of packets will be logged
+     *
+     * @param string $message_number
+     * @param string $message
+     */
+    private function append_log($message_number, $message)
+    {
+        $this->append_log_helper(
+            NET_SFTP_LOGGING,
+            $message_number,
+            $message,
+            $this->packet_type_log,
+            $this->packet_log,
+            $this->log_size,
+            $this->realtime_log_file,
+            $this->realtime_log_wrap,
+            $this->realtime_log_size
+        );
+    }
+
+    /**
+     * Returns a log of the packets that have been sent and received.
+     *
+     * Returns a string if NET_SFTP_LOGGING == self::LOG_COMPLEX, an array if NET_SFTP_LOGGING == self::LOG_SIMPLE and false if !defined('NET_SFTP_LOGGING')
+     *
+     * @return array|string|false
+     */
+    public function getSFTPLog()
+    {
+        if (!defined('NET_SFTP_LOGGING')) {
+            return false;
+        }
+
+        switch (NET_SFTP_LOGGING) {
+            case self::LOG_COMPLEX:
+                return $this->format_log($this->packet_log, $this->packet_type_log);
+                break;
+            //case self::LOG_SIMPLE:
+            default:
+                return $this->packet_type_log;
+        }
+    }
+
+    /**
+     * Returns all errors on the SFTP layer
+     *
+     * @return array
+     */
+    public function getSFTPErrors()
+    {
+        return $this->sftp_errors;
+    }
+
+    /**
+     * Returns the last error on the SFTP layer
+     *
+     * @return string
+     */
+    public function getLastSFTPError()
+    {
+        return count($this->sftp_errors) ? $this->sftp_errors[count($this->sftp_errors) - 1] : '';
+    }
+
+    /**
+     * Get supported SFTP versions
+     *
+     * @return array
+     */
+    public function getSupportedVersions()
+    {
+        if (!($this->bitmap & SSH2::MASK_LOGIN)) {
+            return false;
+        }
+
+        if (!$this->partial_init) {
+            $this->partial_init_sftp_connection();
+        }
+
+        $temp = ['version' => $this->defaultVersion];
+        if (isset($this->extensions['versions'])) {
+            $temp['extensions'] = $this->extensions['versions'];
+        }
+        return $temp;
+    }
+
+    /**
+     * Get supported SFTP extensions
+     *
+     * @return array
+     */
+    public function getSupportedExtensions()
+    {
+        if (!($this->bitmap & SSH2::MASK_LOGIN)) {
+            return false;
+        }
+
+        if (!$this->partial_init) {
+            $this->partial_init_sftp_connection();
+        }
+
+        return $this->extensions;
+    }
+
+    /**
+     * Get supported SFTP versions
+     *
+     * @return int|false
+     */
+    public function getNegotiatedVersion()
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        return $this->version;
+    }
+
+    /**
+     * Set preferred version
+     *
+     * If you're preferred version isn't supported then the highest supported
+     * version of SFTP will be utilized. Set to null or false or int(0) to
+     * unset the preferred version
+     *
+     * @param int $version
+     */
+    public function setPreferredVersion($version)
+    {
+        $this->preferredVersion = $version;
+    }
+
+    /**
+     * Disconnect
+     *
+     * @param int $reason
+     * @return false
+     */
+    protected function disconnect_helper($reason)
+    {
+        $this->pwd = false;
+        return parent::disconnect_helper($reason);
+    }
+
+    /**
+     * Enable Date Preservation
+     *
+     */
+    public function enableDatePreservation()
+    {
+        $this->preserveTime = true;
+    }
+
+    /**
+     * Disable Date Preservation
+     *
+     */
+    public function disableDatePreservation()
+    {
+        $this->preserveTime = false;
+    }
+
+    /**
+     * POSIX Rename
+     *
+     * Where rename() fails "if there already exists a file with the name specified by newpath"
+     * (draft-ietf-secsh-filexfer-02#section-6.5), posix_rename() overwrites the existing file in an atomic fashion.
+     * ie. "there is no observable instant in time where the name does not refer to either the old or the new file"
+     * (draft-ietf-secsh-filexfer-13#page-39).
+     *
+     * @param string $oldname
+     * @param string $newname
+     * @return bool
+     */
+    public function posix_rename($oldname, $newname)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        $oldname = $this->realpath($oldname);
+        $newname = $this->realpath($newname);
+        if ($oldname === false || $newname === false) {
+            return false;
+        }
+
+        if ($this->version >= 5) {
+            $packet = Strings::packSSH2('ssN', $oldname, $newname, 2); // 2 = SSH_FXP_RENAME_ATOMIC
+            $this->send_sftp_packet(NET_SFTP_RENAME, $packet);
+        } elseif (isset($this->extensions['posix-rename@openssh.com']) && $this->extensions['posix-rename@openssh.com'] === '1') {
+            $packet = Strings::packSSH2('sss', 'posix-rename@openssh.com', $oldname, $newname);
+            $this->send_sftp_packet(NET_SFTP_EXTENDED, $packet);
+        } else {
+            throw new \RuntimeException(
+                "Extension 'posix-rename@openssh.com' is not supported by the server. " .
+                "Call getSupportedVersions() to see a list of supported extension"
+            );
+        }
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            throw new \UnexpectedValueException('Expected NET_SFTP_STATUS. '
+                                              . 'Got packet type: ' . $this->packet_type);
+        }
+
+        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+        list($status) = Strings::unpackSSH2('N', $response);
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->logError($response, $status);
+            return false;
+        }
+
+        // don't move the stat cache entry over since this operation could very well change the
+        // atime and mtime attributes
+        //$this->update_stat_cache($newname, $this->query_stat_cache($oldname));
+        $this->remove_from_stat_cache($oldname);
+        $this->remove_from_stat_cache($newname);
+
+        return true;
+    }
+
+    /**
+     * Returns general information about a file system.
+     *
+     * The function statvfs() returns information about a mounted filesystem.
+     * @see https://man7.org/linux/man-pages/man3/statvfs.3.html
+     *
+     * @param string $path
+     * @return false|array{bsize: int, frsize: int, blocks: int, bfree: int, bavail: int, files: int, ffree: int, favail: int, fsid: int, flag: int, namemax: int}
+     */
+    public function statvfs($path)
+    {
+        if (!$this->precheck()) {
+            return false;
+        }
+
+        if (!isset($this->extensions['statvfs@openssh.com']) || $this->extensions['statvfs@openssh.com'] !== '2') {
+            throw new \RuntimeException(
+                "Extension 'statvfs@openssh.com' is not supported by the server. " .
+                "Call getSupportedVersions() to see a list of supported extension"
+            );
+        }
+
+        $realpath = $this->realpath($path);
+        if ($realpath === false) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2('ss', 'statvfs@openssh.com', $realpath);
+        $this->send_sftp_packet(NET_SFTP_EXTENDED, $packet);
+
+        $response = $this->get_sftp_packet();
+        if ($this->packet_type !== NET_SFTP_EXTENDED_REPLY) {
+            throw new \UnexpectedValueException(
+                'Expected SSH_FXP_EXTENDED_REPLY. '
+                . 'Got packet type: ' . $this->packet_type
+            );
+        }
+
+        /**
+         * These requests return a SSH_FXP_STATUS reply on failure. On success they
+         * return the following SSH_FXP_EXTENDED_REPLY reply:
+         *
+         * uint32        id
+         * uint64        f_bsize     file system block size
+         * uint64        f_frsize     fundamental fs block size
+         * uint64        f_blocks     number of blocks (unit f_frsize)
+         * uint64        f_bfree      free blocks in file system
+         * uint64        f_bavail     free blocks for non-root
+         * uint64        f_files      total file inodes
+         * uint64        f_ffree      free file inodes
+         * uint64        f_favail     free file inodes for to non-root
+         * uint64        f_fsid       file system id
+         * uint64        f_flag       bit mask of f_flag values
+         * uint64        f_namemax    maximum filename length
+         */
+        return array_combine(
+            ['bsize', 'frsize', 'blocks', 'bfree', 'bavail', 'files', 'ffree', 'favail', 'fsid', 'flag', 'namemax'],
+            Strings::unpackSSH2('QQQQQQQQQQQ', $response)
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Net/SFTP/Stream.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Net/SFTP/Stream.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Net/SFTP/Stream.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,756 @@
+<?php
+
+/**
+ * SFTP Stream Wrapper
+ *
+ * Creates an sftp:// protocol handler that can be used with, for example, fopen(), dir(), etc.
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2013 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Net\SFTP;
+
+use phpseclib3\Crypt\Common\PrivateKey;
+use phpseclib3\Net\SFTP;
+use phpseclib3\Net\SSH2;
+
+/**
+ * SFTP Stream Wrapper
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Stream
+{
+    /**
+     * SFTP instances
+     *
+     * Rather than re-create the connection we re-use instances if possible
+     *
+     * @var array
+     */
+    public static $instances;
+
+    /**
+     * SFTP instance
+     *
+     * @var object
+     */
+    private $sftp;
+
+    /**
+     * Path
+     *
+     * @var string
+     */
+    private $path;
+
+    /**
+     * Mode
+     *
+     * @var string
+     */
+    private $mode;
+
+    /**
+     * Position
+     *
+     * @var int
+     */
+    private $pos;
+
+    /**
+     * Size
+     *
+     * @var int
+     */
+    private $size;
+
+    /**
+     * Directory entries
+     *
+     * @var array
+     */
+    private $entries;
+
+    /**
+     * EOF flag
+     *
+     * @var bool
+     */
+    private $eof;
+
+    /**
+     * Context resource
+     *
+     * Technically this needs to be publicly accessible so PHP can set it directly
+     *
+     * @var resource
+     */
+    public $context;
+
+    /**
+     * Notification callback function
+     *
+     * @var callable
+     */
+    private $notification;
+
+    /**
+     * Registers this class as a URL wrapper.
+     *
+     * @param string $protocol The wrapper name to be registered.
+     * @return bool True on success, false otherwise.
+     */
+    public static function register($protocol = 'sftp')
+    {
+        if (in_array($protocol, stream_get_wrappers(), true)) {
+            return false;
+        }
+        return stream_wrapper_register($protocol, get_called_class());
+    }
+
+    /**
+     * The Constructor
+     *
+     */
+    public function __construct()
+    {
+        if (defined('NET_SFTP_STREAM_LOGGING')) {
+            echo "__construct()\r\n";
+        }
+    }
+
+    /**
+     * Path Parser
+     *
+     * Extract a path from a URI and actually connect to an SSH server if appropriate
+     *
+     * If "notification" is set as a context parameter the message code for successful login is
+     * NET_SSH2_MSG_USERAUTH_SUCCESS. For a failed login it's NET_SSH2_MSG_USERAUTH_FAILURE.
+     *
+     * @param string $path
+     * @return string
+     */
+    protected function parse_path($path)
+    {
+        $orig = $path;
+        extract(parse_url($path) + ['port' => 22]);
+        if (isset($query)) {
+            $path .= '?' . $query;
+        } elseif (preg_match('/(\?|\?#)$/', $orig)) {
+            $path .= '?';
+        }
+        if (isset($fragment)) {
+            $path .= '#' . $fragment;
+        } elseif ($orig[strlen($orig) - 1] == '#') {
+            $path .= '#';
+        }
+
+        if (!isset($host)) {
+            return false;
+        }
+
+        if (isset($this->context)) {
+            $context = stream_context_get_params($this->context);
+            if (isset($context['notification'])) {
+                $this->notification = $context['notification'];
+            }
+        }
+
+        if (preg_match('/^{[a-z0-9]+}$/i', $host)) {
+            $host = SSH2::getConnectionByResourceId($host);
+            if ($host === false) {
+                return false;
+            }
+            $this->sftp = $host;
+        } else {
+            if (isset($this->context)) {
+                $context = stream_context_get_options($this->context);
+            }
+            if (isset($context[$scheme]['session'])) {
+                $sftp = $context[$scheme]['session'];
+            }
+            if (isset($context[$scheme]['sftp'])) {
+                $sftp = $context[$scheme]['sftp'];
+            }
+            if (isset($sftp) && $sftp instanceof SFTP) {
+                $this->sftp = $sftp;
+                return $path;
+            }
+            if (isset($context[$scheme]['username'])) {
+                $user = $context[$scheme]['username'];
+            }
+            if (isset($context[$scheme]['password'])) {
+                $pass = $context[$scheme]['password'];
+            }
+            if (isset($context[$scheme]['privkey']) && $context[$scheme]['privkey'] instanceof PrivateKey) {
+                $pass = $context[$scheme]['privkey'];
+            }
+
+            if (!isset($user) || !isset($pass)) {
+                return false;
+            }
+
+            // casting $pass to a string is necessary in the event that it's a \phpseclib3\Crypt\RSA object
+            if (isset(self::$instances[$host][$port][$user][(string) $pass])) {
+                $this->sftp = self::$instances[$host][$port][$user][(string) $pass];
+            } else {
+                $this->sftp = new SFTP($host, $port);
+                $this->sftp->disableStatCache();
+                if (isset($this->notification) && is_callable($this->notification)) {
+                    /* if !is_callable($this->notification) we could do this:
+
+                       user_error('fopen(): failed to call user notifier', E_USER_WARNING);
+
+                       the ftp wrapper gives errors like that when the notifier isn't callable.
+                       i've opted not to do that, however, since the ftp wrapper gives the line
+                       on which the fopen occurred as the line number - not the line that the
+                       user_error is on.
+                    */
+                    call_user_func($this->notification, STREAM_NOTIFY_CONNECT, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
+                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_REQUIRED, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
+                    if (!$this->sftp->login($user, $pass)) {
+                        call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_ERR, 'Login Failure', NET_SSH2_MSG_USERAUTH_FAILURE, 0, 0);
+                        return false;
+                    }
+                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_INFO, 'Login Success', NET_SSH2_MSG_USERAUTH_SUCCESS, 0, 0);
+                } else {
+                    if (!$this->sftp->login($user, $pass)) {
+                        return false;
+                    }
+                }
+                self::$instances[$host][$port][$user][(string) $pass] = $this->sftp;
+            }
+        }
+
+        return $path;
+    }
+
+    /**
+     * Opens file or URL
+     *
+     * @param string $path
+     * @param string $mode
+     * @param int $options
+     * @param string $opened_path
+     * @return bool
+     */
+    private function _stream_open($path, $mode, $options, &$opened_path)
+    {
+        $path = $this->parse_path($path);
+
+        if ($path === false) {
+            return false;
+        }
+        $this->path = $path;
+
+        $this->size = $this->sftp->filesize($path);
+        $this->mode = preg_replace('#[bt]$#', '', $mode);
+        $this->eof = false;
+
+        if ($this->size === false) {
+            if ($this->mode[0] == 'r') {
+                return false;
+            } else {
+                $this->sftp->touch($path);
+                $this->size = 0;
+            }
+        } else {
+            switch ($this->mode[0]) {
+                case 'x':
+                    return false;
+                case 'w':
+                    $this->sftp->truncate($path, 0);
+                    $this->size = 0;
+            }
+        }
+
+        $this->pos = $this->mode[0] != 'a' ? 0 : $this->size;
+
+        return true;
+    }
+
+    /**
+     * Read from stream
+     *
+     * @param int $count
+     * @return mixed
+     */
+    private function _stream_read($count)
+    {
+        switch ($this->mode) {
+            case 'w':
+            case 'a':
+            case 'x':
+            case 'c':
+                return false;
+        }
+
+        // commented out because some files - eg. /dev/urandom - will say their size is 0 when in fact it's kinda infinite
+        //if ($this->pos >= $this->size) {
+        //    $this->eof = true;
+        //    return false;
+        //}
+
+        $result = $this->sftp->get($this->path, false, $this->pos, $count);
+        if (isset($this->notification) && is_callable($this->notification)) {
+            if ($result === false) {
+                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
+                return 0;
+            }
+            // seems that PHP calls stream_read in 8k chunks
+            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($result), $this->size);
+        }
+
+        if (empty($result)) { // ie. false or empty string
+            $this->eof = true;
+            return false;
+        }
+        $this->pos += strlen($result);
+
+        return $result;
+    }
+
+    /**
+     * Write to stream
+     *
+     * @param string $data
+     * @return int|false
+     */
+    private function _stream_write($data)
+    {
+        switch ($this->mode) {
+            case 'r':
+                return false;
+        }
+
+        $result = $this->sftp->put($this->path, $data, SFTP::SOURCE_STRING, $this->pos);
+        if (isset($this->notification) && is_callable($this->notification)) {
+            if (!$result) {
+                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
+                return 0;
+            }
+            // seems that PHP splits up strings into 8k blocks before calling stream_write
+            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($data), strlen($data));
+        }
+
+        if ($result === false) {
+            return false;
+        }
+        $this->pos += strlen($data);
+        if ($this->pos > $this->size) {
+            $this->size = $this->pos;
+        }
+        $this->eof = false;
+        return strlen($data);
+    }
+
+    /**
+     * Retrieve the current position of a stream
+     *
+     * @return int
+     */
+    private function _stream_tell()
+    {
+        return $this->pos;
+    }
+
+    /**
+     * Tests for end-of-file on a file pointer
+     *
+     * In my testing there are four classes functions that normally effect the pointer:
+     * fseek, fputs  / fwrite, fgets / fread and ftruncate.
+     *
+     * Only fgets / fread, however, results in feof() returning true. do fputs($fp, 'aaa') on a blank file and feof()
+     * will return false. do fread($fp, 1) and feof() will then return true. do fseek($fp, 10) on ablank file and feof()
+     * will return false. do fread($fp, 1) and feof() will then return true.
+     *
+     * @return bool
+     */
+    private function _stream_eof()
+    {
+        return $this->eof;
+    }
+
+    /**
+     * Seeks to specific location in a stream
+     *
+     * @param int $offset
+     * @param int $whence
+     * @return bool
+     */
+    private function _stream_seek($offset, $whence)
+    {
+        switch ($whence) {
+            case SEEK_SET:
+                if ($offset < 0) {
+                    return false;
+                }
+                break;
+            case SEEK_CUR:
+                $offset += $this->pos;
+                break;
+            case SEEK_END:
+                $offset += $this->size;
+        }
+
+        $this->pos = $offset;
+        $this->eof = false;
+        return true;
+    }
+
+    /**
+     * Change stream options
+     *
+     * @param string $path
+     * @param int $option
+     * @param mixed $var
+     * @return bool
+     */
+    private function _stream_metadata($path, $option, $var)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        // stream_metadata was introduced in PHP 5.4.0 but as of 5.4.11 the constants haven't been defined
+        // see http://www.php.net/streamwrapper.stream-metadata and https://bugs.php.net/64246
+        //     and https://github.com/php/php-src/blob/master/main/php_streams.h#L592
+        switch ($option) {
+            case 1: // PHP_STREAM_META_TOUCH
+                $time = isset($var[0]) ? $var[0] : null;
+                $atime = isset($var[1]) ? $var[1] : null;
+                return $this->sftp->touch($path, $time, $atime);
+            case 2: // PHP_STREAM_OWNER_NAME
+            case 3: // PHP_STREAM_GROUP_NAME
+                return false;
+            case 4: // PHP_STREAM_META_OWNER
+                return $this->sftp->chown($path, $var);
+            case 5: // PHP_STREAM_META_GROUP
+                return $this->sftp->chgrp($path, $var);
+            case 6: // PHP_STREAM_META_ACCESS
+                return $this->sftp->chmod($path, $var) !== false;
+        }
+    }
+
+    /**
+     * Retrieve the underlaying resource
+     *
+     * @param int $cast_as
+     * @return resource
+     */
+    private function _stream_cast($cast_as)
+    {
+        return $this->sftp->fsock;
+    }
+
+    /**
+     * Advisory file locking
+     *
+     * @param int $operation
+     * @return bool
+     */
+    private function _stream_lock($operation)
+    {
+        return false;
+    }
+
+    /**
+     * Renames a file or directory
+     *
+     * Attempts to rename oldname to newname, moving it between directories if necessary.
+     * If newname exists, it will be overwritten.  This is a departure from what \phpseclib3\Net\SFTP
+     * does.
+     *
+     * @param string $path_from
+     * @param string $path_to
+     * @return bool
+     */
+    private function _rename($path_from, $path_to)
+    {
+        $path1 = parse_url($path_from);
+        $path2 = parse_url($path_to);
+        unset($path1['path'], $path2['path']);
+        if ($path1 != $path2) {
+            return false;
+        }
+
+        $path_from = $this->parse_path($path_from);
+        $path_to = parse_url($path_to);
+        if ($path_from === false) {
+            return false;
+        }
+
+        $path_to = $path_to['path']; // the $component part of parse_url() was added in PHP 5.1.2
+        // "It is an error if there already exists a file with the name specified by newpath."
+        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-6.5
+        if (!$this->sftp->rename($path_from, $path_to)) {
+            if ($this->sftp->stat($path_to)) {
+                return $this->sftp->delete($path_to, true) && $this->sftp->rename($path_from, $path_to);
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Open directory handle
+     *
+     * The only $options is "whether or not to enforce safe_mode (0x04)". Since safe mode was deprecated in 5.3 and
+     * removed in 5.4 I'm just going to ignore it.
+     *
+     * Also, nlist() is the best that this function is realistically going to be able to do. When an SFTP client
+     * sends a SSH_FXP_READDIR packet you don't generally get info on just one file but on multiple files. Quoting
+     * the SFTP specs:
+     *
+     *    The SSH_FXP_NAME response has the following format:
+     *
+     *        uint32     id
+     *        uint32     count
+     *        repeats count times:
+     *                string     filename
+     *                string     longname
+     *                ATTRS      attrs
+     *
+     * @param string $path
+     * @param int $options
+     * @return bool
+     */
+    private function _dir_opendir($path, $options)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+        $this->pos = 0;
+        $this->entries = $this->sftp->nlist($path);
+        return $this->entries !== false;
+    }
+
+    /**
+     * Read entry from directory handle
+     *
+     * @return mixed
+     */
+    private function _dir_readdir()
+    {
+        if (isset($this->entries[$this->pos])) {
+            return $this->entries[$this->pos++];
+        }
+        return false;
+    }
+
+    /**
+     * Rewind directory handle
+     *
+     * @return bool
+     */
+    private function _dir_rewinddir()
+    {
+        $this->pos = 0;
+        return true;
+    }
+
+    /**
+     * Close directory handle
+     *
+     * @return bool
+     */
+    private function _dir_closedir()
+    {
+        return true;
+    }
+
+    /**
+     * Create a directory
+     *
+     * Only valid $options is STREAM_MKDIR_RECURSIVE
+     *
+     * @param string $path
+     * @param int $mode
+     * @param int $options
+     * @return bool
+     */
+    private function _mkdir($path, $mode, $options)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->mkdir($path, $mode, $options & STREAM_MKDIR_RECURSIVE);
+    }
+
+    /**
+     * Removes a directory
+     *
+     * Only valid $options is STREAM_MKDIR_RECURSIVE per <http://php.net/streamwrapper.rmdir>, however,
+     * <http://php.net/rmdir>  does not have a $recursive parameter as mkdir() does so I don't know how
+     * STREAM_MKDIR_RECURSIVE is supposed to be set. Also, when I try it out with rmdir() I get 8 as
+     * $options. What does 8 correspond to?
+     *
+     * @param string $path
+     * @param int $options
+     * @return bool
+     */
+    private function _rmdir($path, $options)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->rmdir($path);
+    }
+
+    /**
+     * Flushes the output
+     *
+     * See <http://php.net/fflush>. Always returns true because \phpseclib3\Net\SFTP doesn't cache stuff before writing
+     *
+     * @return bool
+     */
+    private function _stream_flush()
+    {
+        return true;
+    }
+
+    /**
+     * Retrieve information about a file resource
+     *
+     * @return mixed
+     */
+    private function _stream_stat()
+    {
+        $results = $this->sftp->stat($this->path);
+        if ($results === false) {
+            return false;
+        }
+        return $results;
+    }
+
+    /**
+     * Delete a file
+     *
+     * @param string $path
+     * @return bool
+     */
+    private function _unlink($path)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->delete($path, false);
+    }
+
+    /**
+     * Retrieve information about a file
+     *
+     * Ignores the STREAM_URL_STAT_QUIET flag because the entirety of \phpseclib3\Net\SFTP\Stream is quiet by default
+     * might be worthwhile to reconstruct bits 12-16 (ie. the file type) if mode doesn't have them but we'll
+     * cross that bridge when and if it's reached
+     *
+     * @param string $path
+     * @param int $flags
+     * @return mixed
+     */
+    private function _url_stat($path, $flags)
+    {
+        $path = $this->parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        $results = $flags & STREAM_URL_STAT_LINK ? $this->sftp->lstat($path) : $this->sftp->stat($path);
+        if ($results === false) {
+            return false;
+        }
+
+        return $results;
+    }
+
+    /**
+     * Truncate stream
+     *
+     * @param int $new_size
+     * @return bool
+     */
+    private function _stream_truncate($new_size)
+    {
+        if (!$this->sftp->truncate($this->path, $new_size)) {
+            return false;
+        }
+
+        $this->eof = false;
+        $this->size = $new_size;
+
+        return true;
+    }
+
+    /**
+     * Change stream options
+     *
+     * STREAM_OPTION_WRITE_BUFFER isn't supported for the same reason stream_flush isn't.
+     * The other two aren't supported because of limitations in \phpseclib3\Net\SFTP.
+     *
+     * @param int $option
+     * @param int $arg1
+     * @param int $arg2
+     * @return bool
+     */
+    private function _stream_set_option($option, $arg1, $arg2)
+    {
+        return false;
+    }
+
+    /**
+     * Close an resource
+     *
+     */
+    private function _stream_close()
+    {
+    }
+
+    /**
+     * __call Magic Method
+     *
+     * When you're utilizing an SFTP stream you're not calling the methods in this class directly - PHP is calling them for you.
+     * Which kinda begs the question... what methods is PHP calling and what parameters is it passing to them? This function
+     * lets you figure that out.
+     *
+     * If NET_SFTP_STREAM_LOGGING is defined all calls will be output on the screen and then (regardless of whether or not
+     * NET_SFTP_STREAM_LOGGING is enabled) the parameters will be passed through to the appropriate method.
+     *
+     * @param string $name
+     * @param array $arguments
+     * @return mixed
+     */
+    public function __call($name, array $arguments)
+    {
+        if (defined('NET_SFTP_STREAM_LOGGING')) {
+            echo $name . '(';
+            $last = count($arguments) - 1;
+            foreach ($arguments as $i => $argument) {
+                var_export($argument);
+                if ($i != $last) {
+                    echo ',';
+                }
+            }
+            echo ")\r\n";
+        }
+        $name = '_' . $name;
+        if (!method_exists($this, $name)) {
+            return false;
+        }
+        return $this->$name(...$arguments);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,5437 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SSHv2.
+ *
+ * PHP version 5
+ *
+ * Here are some examples of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $ssh = new \phpseclib3\Net\SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('pwd');
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $key = \phpseclib3\Crypt\PublicKeyLoader::load('...', '(optional) password');
+ *
+ *    $ssh = new \phpseclib3\Net\SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', $key)) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->read('username@username:~$');
+ *    $ssh->write("ls -la\n");
+ *    echo $ssh->read('username@username:~$');
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Net;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Blowfish;
+use phpseclib3\Crypt\ChaCha20;
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\Crypt\Common\PrivateKey;
+use phpseclib3\Crypt\Common\PublicKey;
+use phpseclib3\Crypt\Common\SymmetricKey;
+use phpseclib3\Crypt\DH;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\EC;
+use phpseclib3\Crypt\Hash;
+use phpseclib3\Crypt\Random;
+use phpseclib3\Crypt\RC4;
+use phpseclib3\Crypt\Rijndael;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Crypt\TripleDES; // Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
+use phpseclib3\Crypt\Twofish;
+use phpseclib3\Exception\ConnectionClosedException;
+use phpseclib3\Exception\InsufficientSetupException;
+use phpseclib3\Exception\InvalidPacketLengthException;
+use phpseclib3\Exception\NoSupportedAlgorithmsException;
+use phpseclib3\Exception\TimeoutException;
+use phpseclib3\Exception\UnableToConnectException;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\Exception\UnsupportedCurveException;
+use phpseclib3\Math\BigInteger;
+use phpseclib3\System\SSH\Agent;
+
+/**
+ * Pure-PHP implementation of SSHv2.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class SSH2
+{
+    /**#@+
+     * Compression Types
+     *
+     */
+    /**
+     * No compression
+     */
+    const NET_SSH2_COMPRESSION_NONE = 1;
+    /**
+     * zlib compression
+     */
+    const NET_SSH2_COMPRESSION_ZLIB = 2;
+    /**
+     * zlib@openssh.com
+     */
+    const NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH = 3;
+    /**#@-*/
+
+    // Execution Bitmap Masks
+    const MASK_CONSTRUCTOR   = 0x00000001;
+    const MASK_CONNECTED     = 0x00000002;
+    const MASK_LOGIN_REQ     = 0x00000004;
+    const MASK_LOGIN         = 0x00000008;
+    const MASK_SHELL         = 0x00000010;
+    const MASK_DISCONNECT    = 0x00000020;
+
+    /*
+     * Channel constants
+     *
+     * RFC4254 refers not to client and server channels but rather to sender and recipient channels.  we don't refer
+     * to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with
+     * a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a
+     * recipient channel.  at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel
+     * would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snippet:
+     *     The 'recipient channel' is the channel number given in the original
+     *     open request, and 'sender channel' is the channel number allocated by
+     *     the other side.
+     *
+     * @see \phpseclib3\Net\SSH2::send_channel_packet()
+     * @see \phpseclib3\Net\SSH2::get_channel_packet()
+     */
+    const CHANNEL_EXEC          = 1; // PuTTy uses 0x100
+    const CHANNEL_SHELL         = 2;
+    const CHANNEL_SUBSYSTEM     = 3;
+    const CHANNEL_AGENT_FORWARD = 4;
+    const CHANNEL_KEEP_ALIVE    = 5;
+
+    /**
+     * Returns the message numbers
+     *
+     * @see \phpseclib3\Net\SSH2::getLog()
+     */
+    const LOG_SIMPLE = 1;
+    /**
+     * Returns the message content
+     *
+     * @see \phpseclib3\Net\SSH2::getLog()
+     */
+    const LOG_COMPLEX = 2;
+    /**
+     * Outputs the content real-time
+     */
+    const LOG_REALTIME = 3;
+    /**
+     * Dumps the content real-time to a file
+     */
+    const LOG_REALTIME_FILE = 4;
+    /**
+     * Outputs the message numbers real-time
+     */
+    const LOG_SIMPLE_REALTIME = 5;
+    /**
+     * Make sure that the log never gets larger than this
+     *
+     * @see \phpseclib3\Net\SSH2::getLog()
+     */
+    const LOG_MAX_SIZE = 1048576; // 1024 * 1024
+
+    /**
+     * Returns when a string matching $expect exactly is found
+     *
+     * @see \phpseclib3\Net\SSH2::read()
+     */
+    const READ_SIMPLE = 1;
+    /**
+     * Returns when a string matching the regular expression $expect is found
+     *
+     * @see \phpseclib3\Net\SSH2::read()
+     */
+    const READ_REGEX = 2;
+    /**
+     * Returns whenever a data packet is received.
+     *
+     * Some data packets may only contain a single character so it may be necessary
+     * to call read() multiple times when using this option
+     *
+     * @see \phpseclib3\Net\SSH2::read()
+     */
+    const READ_NEXT = 3;
+
+    /**
+     * The SSH identifier
+     *
+     * @var string
+     */
+    private $identifier;
+
+    /**
+     * The Socket Object
+     *
+     * @var resource|closed-resource|null
+     */
+    public $fsock;
+
+    /**
+     * Execution Bitmap
+     *
+     * The bits that are set represent functions that have been called already.  This is used to determine
+     * if a requisite function has been successfully executed.  If not, an error should be thrown.
+     *
+     * @var int
+     */
+    protected $bitmap = 0;
+
+    /**
+     * Error information
+     *
+     * @see self::getErrors()
+     * @see self::getLastError()
+     * @var array
+     */
+    private $errors = [];
+
+    /**
+     * Server Identifier
+     *
+     * @see self::getServerIdentification()
+     * @var string|false
+     */
+    protected $server_identifier = false;
+
+    /**
+     * Key Exchange Algorithms
+     *
+     * @see self::getKexAlgorithims()
+     * @var array|false
+     */
+    private $kex_algorithms = false;
+
+    /**
+     * Key Exchange Algorithm
+     *
+     * @see self::getMethodsNegotiated()
+     * @var string|false
+     */
+    private $kex_algorithm = false;
+
+    /**
+     * Minimum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     */
+    private $kex_dh_group_size_min = 1536;
+
+    /**
+     * Preferred Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     */
+    private $kex_dh_group_size_preferred = 2048;
+
+    /**
+     * Maximum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     */
+    private $kex_dh_group_size_max = 4096;
+
+    /**
+     * Server Host Key Algorithms
+     *
+     * @see self::getServerHostKeyAlgorithms()
+     * @var array|false
+     */
+    private $server_host_key_algorithms = false;
+
+    /**
+     * Supported Private Key Algorithms
+     *
+     * In theory this should be the same as the Server Host Key Algorithms but, in practice,
+     * some servers (eg. Azure) will support rsa-sha2-512 as a server host key algorithm but
+     * not a private key algorithm
+     *
+     * @see self::privatekey_login()
+     * @var array|false
+     */
+    private $supported_private_key_algorithms = false;
+
+    /**
+     * Encryption Algorithms: Client to Server
+     *
+     * @see self::getEncryptionAlgorithmsClient2Server()
+     * @var array|false
+     */
+    private $encryption_algorithms_client_to_server = false;
+
+    /**
+     * Encryption Algorithms: Server to Client
+     *
+     * @see self::getEncryptionAlgorithmsServer2Client()
+     * @var array|false
+     */
+    private $encryption_algorithms_server_to_client = false;
+
+    /**
+     * MAC Algorithms: Client to Server
+     *
+     * @see self::getMACAlgorithmsClient2Server()
+     * @var array|false
+     */
+    private $mac_algorithms_client_to_server = false;
+
+    /**
+     * MAC Algorithms: Server to Client
+     *
+     * @see self::getMACAlgorithmsServer2Client()
+     * @var array|false
+     */
+    private $mac_algorithms_server_to_client = false;
+
+    /**
+     * Compression Algorithms: Client to Server
+     *
+     * @see self::getCompressionAlgorithmsClient2Server()
+     * @var array|false
+     */
+    private $compression_algorithms_client_to_server = false;
+
+    /**
+     * Compression Algorithms: Server to Client
+     *
+     * @see self::getCompressionAlgorithmsServer2Client()
+     * @var array|false
+     */
+    private $compression_algorithms_server_to_client = false;
+
+    /**
+     * Languages: Server to Client
+     *
+     * @see self::getLanguagesServer2Client()
+     * @var array|false
+     */
+    private $languages_server_to_client = false;
+
+    /**
+     * Languages: Client to Server
+     *
+     * @see self::getLanguagesClient2Server()
+     * @var array|false
+     */
+    private $languages_client_to_server = false;
+
+    /**
+     * Preferred Algorithms
+     *
+     * @see self::setPreferredAlgorithms()
+     * @var array
+     */
+    private $preferred = [];
+
+    /**
+     * Block Size for Server to Client Encryption
+     *
+     * "Note that the length of the concatenation of 'packet_length',
+     *  'padding_length', 'payload', and 'random padding' MUST be a multiple
+     *  of the cipher block size or 8, whichever is larger.  This constraint
+     *  MUST be enforced, even when using stream ciphers."
+     *
+     *  -- http://tools.ietf.org/html/rfc4253#section-6
+     *
+     * @see self::__construct()
+     * @see self::_send_binary_packet()
+     * @var int
+     */
+    private $encrypt_block_size = 8;
+
+    /**
+     * Block Size for Client to Server Encryption
+     *
+     * @see self::__construct()
+     * @see self::_get_binary_packet()
+     * @var int
+     */
+    private $decrypt_block_size = 8;
+
+    /**
+     * Server to Client Encryption Object
+     *
+     * @see self::_get_binary_packet()
+     * @var SymmetricKey|false
+     */
+    private $decrypt = false;
+
+    /**
+     * Decryption Algorithm Name
+     *
+     * @var string|null
+     */
+    private $decryptName;
+
+    /**
+     * Decryption Invocation Counter
+     *
+     * Used by GCM
+     *
+     * @var string|null
+     */
+    private $decryptInvocationCounter;
+
+    /**
+     * Fixed Part of Nonce
+     *
+     * Used by GCM
+     *
+     * @var string|null
+     */
+    private $decryptFixedPart;
+
+    /**
+     * Server to Client Length Encryption Object
+     *
+     * @see self::_get_binary_packet()
+     * @var object
+     */
+    private $lengthDecrypt = false;
+
+    /**
+     * Client to Server Encryption Object
+     *
+     * @see self::_send_binary_packet()
+     * @var SymmetricKey|false
+     */
+    private $encrypt = false;
+
+    /**
+     * Encryption Algorithm Name
+     *
+     * @var string|null
+     */
+    private $encryptName;
+
+    /**
+     * Encryption Invocation Counter
+     *
+     * Used by GCM
+     *
+     * @var string|null
+     */
+    private $encryptInvocationCounter;
+
+    /**
+     * Fixed Part of Nonce
+     *
+     * Used by GCM
+     *
+     * @var string|null
+     */
+    private $encryptFixedPart;
+
+    /**
+     * Client to Server Length Encryption Object
+     *
+     * @see self::_send_binary_packet()
+     * @var object
+     */
+    private $lengthEncrypt = false;
+
+    /**
+     * Client to Server HMAC Object
+     *
+     * @see self::_send_binary_packet()
+     * @var object
+     */
+    private $hmac_create = false;
+
+    /**
+     * Client to Server HMAC Name
+     *
+     * @var string|false
+     */
+    private $hmac_create_name;
+
+    /**
+     * Client to Server ETM
+     *
+     * @var int|false
+     */
+    private $hmac_create_etm;
+
+    /**
+     * Server to Client HMAC Object
+     *
+     * @see self::_get_binary_packet()
+     * @var object
+     */
+    private $hmac_check = false;
+
+    /**
+     * Server to Client HMAC Name
+     *
+     * @var string|false
+     */
+    private $hmac_check_name;
+
+    /**
+     * Server to Client ETM
+     *
+     * @var int|false
+     */
+    private $hmac_check_etm;
+
+    /**
+     * Size of server to client HMAC
+     *
+     * We need to know how big the HMAC will be for the server to client direction so that we know how many bytes to read.
+     * For the client to server side, the HMAC object will make the HMAC as long as it needs to be.  All we need to do is
+     * append it.
+     *
+     * @see self::_get_binary_packet()
+     * @var int
+     */
+    private $hmac_size = false;
+
+    /**
+     * Server Public Host Key
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     */
+    private $server_public_host_key;
+
+    /**
+     * Session identifier
+     *
+     * "The exchange hash H from the first key exchange is additionally
+     *  used as the session identifier, which is a unique identifier for
+     *  this connection."
+     *
+     *  -- http://tools.ietf.org/html/rfc4253#section-7.2
+     *
+     * @see self::_key_exchange()
+     * @var string
+     */
+    private $session_id = false;
+
+    /**
+     * Exchange hash
+     *
+     * The current exchange hash
+     *
+     * @see self::_key_exchange()
+     * @var string
+     */
+    private $exchange_hash = false;
+
+    /**
+     * Message Numbers
+     *
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $message_numbers = [];
+
+    /**
+     * Disconnection Message 'reason codes' defined in RFC4253
+     *
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $disconnect_reasons = [];
+
+    /**
+     * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254
+     *
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $channel_open_failure_reasons = [];
+
+    /**
+     * Terminal Modes
+     *
+     * @link http://tools.ietf.org/html/rfc4254#section-8
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $terminal_modes = [];
+
+    /**
+     * SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes
+     *
+     * @link http://tools.ietf.org/html/rfc4254#section-5.2
+     * @see self::__construct()
+     * @var array
+     * @access private
+     */
+    private static $channel_extended_data_type_codes = [];
+
+    /**
+     * Send Sequence Number
+     *
+     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
+     *
+     * @see self::_send_binary_packet()
+     * @var int
+     */
+    private $send_seq_no = 0;
+
+    /**
+     * Get Sequence Number
+     *
+     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
+     *
+     * @see self::_get_binary_packet()
+     * @var int
+     */
+    private $get_seq_no = 0;
+
+    /**
+     * Server Channels
+     *
+     * Maps client channels to server channels
+     *
+     * @see self::get_channel_packet()
+     * @see self::exec()
+     * @var array
+     */
+    protected $server_channels = [];
+
+    /**
+     * Channel Read Buffers
+     *
+     * If a client requests a packet from one channel but receives two packets from another those packets should
+     * be placed in a buffer
+     *
+     * @see self::get_channel_packet()
+     * @see self::exec()
+     * @var array
+     */
+    private $channel_buffers = [];
+
+    /**
+     * Channel Write Buffers
+     *
+     * If a client sends a packet and receives a timeout error mid-transmission, buffer the data written so it
+     * can be de-duplicated upon resuming write
+     *
+     * @see self::send_channel_packet()
+     * @var array
+     */
+    private $channel_buffers_write = [];
+
+    /**
+     * Channel Status
+     *
+     * Contains the type of the last sent message
+     *
+     * @see self::get_channel_packet()
+     * @var array
+     */
+    protected $channel_status = [];
+
+    /**
+     * The identifier of the interactive channel which was opened most recently
+     *
+     * @see self::getInteractiveChannelId()
+     * @var int
+     */
+    private $channel_id_last_interactive = 0;
+
+    /**
+     * Packet Size
+     *
+     * Maximum packet size indexed by channel
+     *
+     * @see self::send_channel_packet()
+     * @var array
+     */
+    private $packet_size_client_to_server = [];
+
+    /**
+     * Message Number Log
+     *
+     * @see self::getLog()
+     * @var array
+     */
+    private $message_number_log = [];
+
+    /**
+     * Message Log
+     *
+     * @see self::getLog()
+     * @var array
+     */
+    private $message_log = [];
+
+    /**
+     * The Window Size
+     *
+     * Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 2GB)
+     *
+     * @var int
+     * @see self::send_channel_packet()
+     * @see self::exec()
+     */
+    protected $window_size = 0x7FFFFFFF;
+
+    /**
+     * What we resize the window to
+     *
+     * When PuTTY resizes the window it doesn't add an additional 0x7FFFFFFF bytes - it adds 0x40000000 bytes.
+     * Some SFTP clients (GoAnywhere) don't support adding 0x7FFFFFFF to the window size after the fact so
+     * we'll just do what PuTTY does
+     *
+     * @var int
+     * @see self::_send_channel_packet()
+     * @see self::exec()
+     */
+    private $window_resize = 0x40000000;
+
+    /**
+     * Window size, server to client
+     *
+     * Window size indexed by channel
+     *
+     * @see self::send_channel_packet()
+     * @var array
+     */
+    protected $window_size_server_to_client = [];
+
+    /**
+     * Window size, client to server
+     *
+     * Window size indexed by channel
+     *
+     * @see self::get_channel_packet()
+     * @var array
+     */
+    private $window_size_client_to_server = [];
+
+    /**
+     * Server signature
+     *
+     * Verified against $this->session_id
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     */
+    private $signature = '';
+
+    /**
+     * Server signature format
+     *
+     * ssh-rsa or ssh-dss.
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     */
+    private $signature_format = '';
+
+    /**
+     * Interactive Buffer
+     *
+     * @see self::read()
+     * @var string
+     */
+    private $interactiveBuffer = '';
+
+    /**
+     * Current log size
+     *
+     * Should never exceed self::LOG_MAX_SIZE
+     *
+     * @see self::_send_binary_packet()
+     * @see self::_get_binary_packet()
+     * @var int
+     */
+    private $log_size;
+
+    /**
+     * Timeout
+     *
+     * @see self::setTimeout()
+     */
+    protected $timeout;
+
+    /**
+     * Current Timeout
+     *
+     * @see self::get_channel_packet()
+     */
+    protected $curTimeout;
+
+    /**
+     * Keep Alive Interval
+     *
+     * @see self::setKeepAlive()
+     */
+    private $keepAlive;
+
+    /**
+     * Real-time log file pointer
+     *
+     * @see self::_append_log()
+     * @var resource|closed-resource
+     */
+    private $realtime_log_file;
+
+    /**
+     * Real-time log file size
+     *
+     * @see self::_append_log()
+     * @var int
+     */
+    private $realtime_log_size;
+
+    /**
+     * Has the signature been validated?
+     *
+     * @see self::getServerPublicHostKey()
+     * @var bool
+     */
+    private $signature_validated = false;
+
+    /**
+     * Real-time log file wrap boolean
+     *
+     * @see self::_append_log()
+     * @var bool
+     */
+    private $realtime_log_wrap;
+
+    /**
+     * Flag to suppress stderr from output
+     *
+     * @see self::enableQuietMode()
+     */
+    private $quiet_mode = false;
+
+    /**
+     * Time of last read/write network activity
+     *
+     * @var float
+     */
+    private $last_packet = null;
+
+    /**
+     * Exit status returned from ssh if any
+     *
+     * @var int
+     */
+    private $exit_status;
+
+    /**
+     * Flag to request a PTY when using exec()
+     *
+     * @var bool
+     * @see self::enablePTY()
+     */
+    private $request_pty = false;
+
+    /**
+     * Contents of stdError
+     *
+     * @var string
+     */
+    private $stdErrorLog;
+
+    /**
+     * The Last Interactive Response
+     *
+     * @see self::_keyboard_interactive_process()
+     * @var string
+     */
+    private $last_interactive_response = '';
+
+    /**
+     * Keyboard Interactive Request / Responses
+     *
+     * @see self::_keyboard_interactive_process()
+     * @var array
+     */
+    private $keyboard_requests_responses = [];
+
+    /**
+     * Banner Message
+     *
+     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
+     * authentication may be relevant for getting legal protection."
+     *
+     * @see self::_filter()
+     * @see self::getBannerMessage()
+     * @var string
+     */
+    private $banner_message = '';
+
+    /**
+     * Did read() timeout or return normally?
+     *
+     * @see self::isTimeout()
+     * @var bool
+     */
+    protected $is_timeout = false;
+
+    /**
+     * Log Boundary
+     *
+     * @see self::_format_log()
+     * @var string
+     */
+    private $log_boundary = ':';
+
+    /**
+     * Log Long Width
+     *
+     * @see self::_format_log()
+     * @var int
+     */
+    private $log_long_width = 65;
+
+    /**
+     * Log Short Width
+     *
+     * @see self::_format_log()
+     * @var int
+     */
+    private $log_short_width = 16;
+
+    /**
+     * Hostname
+     *
+     * @see self::__construct()
+     * @see self::_connect()
+     * @var string
+     */
+    private $host;
+
+    /**
+     * Port Number
+     *
+     * @see self::__construct()
+     * @see self::_connect()
+     * @var int
+     */
+    private $port;
+
+    /**
+     * Number of columns for terminal window size
+     *
+     * @see self::getWindowColumns()
+     * @see self::setWindowColumns()
+     * @see self::setWindowSize()
+     * @var int
+     */
+    private $windowColumns = 80;
+
+    /**
+     * Number of columns for terminal window size
+     *
+     * @see self::getWindowRows()
+     * @see self::setWindowRows()
+     * @see self::setWindowSize()
+     * @var int
+     */
+    private $windowRows = 24;
+
+    /**
+     * Crypto Engine
+     *
+     * @see self::setCryptoEngine()
+     * @see self::_key_exchange()
+     * @var int
+     */
+    private static $crypto_engine = false;
+
+    /**
+     * A System_SSH_Agent for use in the SSH2 Agent Forwarding scenario
+     *
+     * @var Agent
+     */
+    private $agent;
+
+    /**
+     * Connection storage to replicates ssh2 extension functionality:
+     * {@link http://php.net/manual/en/wrappers.ssh2.php#refsect1-wrappers.ssh2-examples}
+     *
+     * @var array<string, SSH2|\WeakReference<SSH2>>
+     */
+    private static $connections;
+
+    /**
+     * Send the identification string first?
+     *
+     * @var bool
+     */
+    private $send_id_string_first = true;
+
+    /**
+     * Send the key exchange initiation packet first?
+     *
+     * @var bool
+     */
+    private $send_kex_first = true;
+
+    /**
+     * Some versions of OpenSSH incorrectly calculate the key size
+     *
+     * @var bool
+     */
+    private $bad_key_size_fix = false;
+
+    /**
+     * Should we try to re-connect to re-establish keys?
+     *
+     * @var bool
+     */
+    private $login_credentials_finalized = false;
+
+    /**
+     * Binary Packet Buffer
+     *
+     * @var object|null
+     */
+    private $binary_packet_buffer = null;
+
+    /**
+     * Preferred Signature Format
+     *
+     * @var string|false
+     */
+    protected $preferred_signature_format = false;
+
+    /**
+     * Authentication Credentials
+     *
+     * @var array
+     */
+    protected $auth = [];
+
+    /**
+     * Terminal
+     *
+     * @var string
+     */
+    private $term = 'vt100';
+
+    /**
+     * The authentication methods that may productively continue authentication.
+     *
+     * @see https://tools.ietf.org/html/rfc4252#section-5.1
+     * @var array|null
+     */
+    private $auth_methods_to_continue = null;
+
+    /**
+     * Compression method
+     *
+     * @var int
+     */
+    private $compress = self::NET_SSH2_COMPRESSION_NONE;
+
+    /**
+     * Decompression method
+     *
+     * @var int
+     */
+    private $decompress = self::NET_SSH2_COMPRESSION_NONE;
+
+    /**
+     * Compression context
+     *
+     * @var resource|false|null
+     */
+    private $compress_context;
+
+    /**
+     * Decompression context
+     *
+     * @var resource|object
+     */
+    private $decompress_context;
+
+    /**
+     * Regenerate Compression Context
+     *
+     * @var bool
+     */
+    private $regenerate_compression_context = false;
+
+    /**
+     * Regenerate Decompression Context
+     *
+     * @var bool
+     */
+    private $regenerate_decompression_context = false;
+
+    /**
+     * Smart multi-factor authentication flag
+     *
+     * @var bool
+     */
+    private $smartMFA = true;
+
+    /**
+     * How many channels are currently opened
+     *
+     * @var int
+     */
+    private $channelCount = 0;
+
+    /**
+     * Does the server support multiple channels? If not then error out
+     * when multiple channels are attempted to be opened
+     *
+     * @var bool
+     */
+    private $errorOnMultipleChannels;
+
+    /**
+     * Terrapin Countermeasure
+     *
+     * "During initial KEX, terminate the connection if any unexpected or out-of-sequence packet is received"
+     * -- https://github.com/openssh/openssh-portable/commit/1edb00c58f8a6875fad6a497aa2bacf37f9e6cd5
+     *
+     * @var int
+     */
+    private $extra_packets;
+
+    /**
+     * Default Constructor.
+     *
+     * $host can either be a string, representing the host, or a stream resource.
+     * If $host is a stream resource then $port doesn't do anything, altho $timeout
+     * still will be used
+     *
+     * @param mixed $host
+     * @param int $port
+     * @param int $timeout
+     * @see self::login()
+     */
+    public function __construct($host, $port = 22, $timeout = 10)
+    {
+        if (empty(self::$message_numbers)) {
+            self::$message_numbers = [
+                1 => 'NET_SSH2_MSG_DISCONNECT',
+                2 => 'NET_SSH2_MSG_IGNORE',
+                3 => 'NET_SSH2_MSG_UNIMPLEMENTED',
+                4 => 'NET_SSH2_MSG_DEBUG',
+                5 => 'NET_SSH2_MSG_SERVICE_REQUEST',
+                6 => 'NET_SSH2_MSG_SERVICE_ACCEPT',
+                7 => 'NET_SSH2_MSG_EXT_INFO', // RFC 8308
+                20 => 'NET_SSH2_MSG_KEXINIT',
+                21 => 'NET_SSH2_MSG_NEWKEYS',
+                30 => 'NET_SSH2_MSG_KEXDH_INIT',
+                31 => 'NET_SSH2_MSG_KEXDH_REPLY',
+                50 => 'NET_SSH2_MSG_USERAUTH_REQUEST',
+                51 => 'NET_SSH2_MSG_USERAUTH_FAILURE',
+                52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS',
+                53 => 'NET_SSH2_MSG_USERAUTH_BANNER',
+
+                80 => 'NET_SSH2_MSG_GLOBAL_REQUEST',
+                81 => 'NET_SSH2_MSG_REQUEST_SUCCESS',
+                82 => 'NET_SSH2_MSG_REQUEST_FAILURE',
+                90 => 'NET_SSH2_MSG_CHANNEL_OPEN',
+                91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION',
+                92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE',
+                93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST',
+                94 => 'NET_SSH2_MSG_CHANNEL_DATA',
+                95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA',
+                96 => 'NET_SSH2_MSG_CHANNEL_EOF',
+                97 => 'NET_SSH2_MSG_CHANNEL_CLOSE',
+                98 => 'NET_SSH2_MSG_CHANNEL_REQUEST',
+                99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS',
+                100 => 'NET_SSH2_MSG_CHANNEL_FAILURE'
+            ];
+            self::$disconnect_reasons = [
+                1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT',
+                2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR',
+                3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED',
+                4 => 'NET_SSH2_DISCONNECT_RESERVED',
+                5 => 'NET_SSH2_DISCONNECT_MAC_ERROR',
+                6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR',
+                7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE',
+                8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED',
+                9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE',
+                10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST',
+                11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION',
+                12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS',
+                13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER',
+                14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE',
+                15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME'
+            ];
+            self::$channel_open_failure_reasons = [
+                1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED'
+            ];
+            self::$terminal_modes = [
+                0 => 'NET_SSH2_TTY_OP_END'
+            ];
+            self::$channel_extended_data_type_codes = [
+                1 => 'NET_SSH2_EXTENDED_DATA_STDERR'
+            ];
+
+            self::define_array(
+                self::$message_numbers,
+                self::$disconnect_reasons,
+                self::$channel_open_failure_reasons,
+                self::$terminal_modes,
+                self::$channel_extended_data_type_codes,
+                [60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'],
+                [60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'],
+                [60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
+                      61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE'],
+                // RFC 4419 - diffie-hellman-group-exchange-sha{1,256}
+                [30 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST_OLD',
+                      31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP',
+                      32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT',
+                      33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY',
+                      34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST'],
+                // RFC 5656 - Elliptic Curves (for curve25519-sha256@libssh.org)
+                [30 => 'NET_SSH2_MSG_KEX_ECDH_INIT',
+                      31 => 'NET_SSH2_MSG_KEX_ECDH_REPLY']
+            );
+        }
+
+        /**
+         * Typehint is required due to a bug in Psalm: https://github.com/vimeo/psalm/issues/7508
+         * @var \WeakReference<SSH2>|SSH2
+         */
+        self::$connections[$this->getResourceId()] = class_exists('WeakReference')
+            ? \WeakReference::create($this)
+            : $this;
+
+        $this->timeout = $timeout;
+
+        if (is_resource($host)) {
+            $this->fsock = $host;
+            return;
+        }
+
+        if (Strings::is_stringable($host)) {
+            $this->host = $host;
+            $this->port = $port;
+        }
+    }
+
+    /**
+     * Set Crypto Engine Mode
+     *
+     * Possible $engine values:
+     * OpenSSL, mcrypt, Eval, PHP
+     *
+     * @param int $engine
+     */
+    public static function setCryptoEngine($engine)
+    {
+        self::$crypto_engine = $engine;
+    }
+
+    /**
+     * Send Identification String First
+     *
+     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
+     * both sides MUST send an identification string". It does not say which side sends it first. In
+     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     */
+    public function sendIdentificationStringFirst()
+    {
+        $this->send_id_string_first = true;
+    }
+
+    /**
+     * Send Identification String Last
+     *
+     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
+     * both sides MUST send an identification string". It does not say which side sends it first. In
+     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     */
+    public function sendIdentificationStringLast()
+    {
+        $this->send_id_string_first = false;
+    }
+
+    /**
+     * Send SSH_MSG_KEXINIT First
+     *
+     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
+     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
+     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     */
+    public function sendKEXINITFirst()
+    {
+        $this->send_kex_first = true;
+    }
+
+    /**
+     * Send SSH_MSG_KEXINIT Last
+     *
+     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
+     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
+     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     */
+    public function sendKEXINITLast()
+    {
+        $this->send_kex_first = false;
+    }
+
+    /**
+     * stream_select wrapper
+     *
+     * Quoting https://stackoverflow.com/a/14262151/569976,
+     * "The general approach to `EINTR` is to simply handle the error and retry the operation again"
+     *
+     * This wrapper does that loop
+     */
+    private static function stream_select(&$read, &$write, &$except, $seconds, $microseconds = null)
+    {
+        $remaining = $seconds + $microseconds / 1000000;
+        $start = microtime(true);
+        while (true) {
+            $result = @stream_select($read, $write, $except, $seconds, $microseconds);
+            if ($result !== false) {
+                return $result;
+            }
+            $elapsed = microtime(true) - $start;
+            $seconds = (int) ($remaining - floor($elapsed));
+            $microseconds = (int) (1000000 * ($remaining - $seconds));
+            if ($elapsed >= $remaining) {
+                return false;
+            }
+        }
+    }
+
+    /**
+     * Connect to an SSHv2 server
+     *
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @throws \RuntimeException on other errors
+     */
+    private function connect()
+    {
+        if ($this->bitmap & self::MASK_CONSTRUCTOR) {
+            return;
+        }
+
+        $this->bitmap |= self::MASK_CONSTRUCTOR;
+
+        $this->curTimeout = $this->timeout;
+
+        if (!is_resource($this->fsock)) {
+            $start = microtime(true);
+            // with stream_select a timeout of 0 means that no timeout takes place;
+            // with fsockopen a timeout of 0 means that you instantly timeout
+            // to resolve this incompatibility a timeout of 100,000 will be used for fsockopen if timeout is 0
+            $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout == 0 ? 100000 : $this->curTimeout);
+            if (!$this->fsock) {
+                $host = $this->host . ':' . $this->port;
+                throw new UnableToConnectException(rtrim("Cannot connect to $host. Error $errno. $errstr"));
+            }
+            $elapsed = microtime(true) - $start;
+
+            if ($this->curTimeout) {
+                $this->curTimeout -= $elapsed;
+                if ($this->curTimeout < 0) {
+                    throw new \RuntimeException('Connection timed out whilst attempting to open socket connection');
+                }
+            }
+
+            if (defined('NET_SSH2_LOGGING')) {
+                $this->append_log('(fsockopen took ' . round($elapsed, 4) . 's)', '');
+            }
+        }
+
+        $this->identifier = $this->generate_identifier();
+
+        if ($this->send_id_string_first) {
+            $start = microtime(true);
+            fputs($this->fsock, $this->identifier . "\r\n");
+            $elapsed = round(microtime(true) - $start, 4);
+            if (defined('NET_SSH2_LOGGING')) {
+                $this->append_log("-> (network: $elapsed)", $this->identifier . "\r\n");
+            }
+        }
+
+        /* According to the SSH2 specs,
+
+          "The server MAY send other lines of data before sending the version
+           string.  Each line SHOULD be terminated by a Carriage Return and Line
+           Feed.  Such lines MUST NOT begin with "SSH-", and SHOULD be encoded
+           in ISO-10646 UTF-8 [RFC3629] (language is not specified).  Clients
+           MUST be able to process such lines." */
+        $data = '';
+        $totalElapsed = 0;
+        while (!feof($this->fsock) && !preg_match('#(.*)^(SSH-(\d\.\d+).*)#ms', $data, $matches)) {
+            $line = '';
+            while (true) {
+                if ($this->curTimeout) {
+                    if ($this->curTimeout < 0) {
+                        throw new \RuntimeException('Connection timed out whilst receiving server identification string');
+                    }
+                    $read = [$this->fsock];
+                    $write = $except = null;
+                    $start = microtime(true);
+                    $sec = (int) floor($this->curTimeout);
+                    $usec = (int) (1000000 * ($this->curTimeout - $sec));
+                    if (static::stream_select($read, $write, $except, $sec, $usec) === false) {
+                        throw new \RuntimeException('Connection timed out whilst receiving server identification string');
+                    }
+                    $elapsed = microtime(true) - $start;
+                    $totalElapsed += $elapsed;
+                    $this->curTimeout -= $elapsed;
+                }
+
+                $temp = stream_get_line($this->fsock, 255, "\n");
+                if ($temp === false) {
+                    throw new \RuntimeException('Error reading SSH identification string; are you sure you\'re connecting to an SSH server?');
+                }
+
+                $line .= $temp;
+                if (strlen($temp) == 255) {
+                    continue;
+                }
+
+                $line .= "\n";
+
+                break;
+            }
+
+            $data .= $line;
+        }
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $this->append_log('<- (network: ' . round($totalElapsed, 4) . ')', $line);
+        }
+
+        if (feof($this->fsock)) {
+            $this->bitmap = 0;
+            throw new ConnectionClosedException('Connection closed by server; are you sure you\'re connected to an SSH server?');
+        }
+
+        $extra = $matches[1];
+
+        $this->server_identifier = trim($data, "\r\n");
+        if (strlen($extra)) {
+            $this->errors[] = $data;
+        }
+
+        if (version_compare($matches[3], '1.99', '<')) {
+            $this->bitmap = 0;
+            throw new UnableToConnectException("Cannot connect to SSH $matches[3] servers");
+        }
+
+        // Ubuntu's OpenSSH from 5.8 to 6.9 didn't work with multiple channels. see
+        // https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1334916 for more info.
+        // https://lists.ubuntu.com/archives/oneiric-changes/2011-July/005772.html discusses
+        // when consolekit was incorporated.
+        // https://marc.info/?l=openssh-unix-dev&m=163409903417589&w=2 discusses some of the
+        // issues with how Ubuntu incorporated consolekit
+        $pattern = '#^SSH-2\.0-OpenSSH_([\d.]+)[^ ]* Ubuntu-.*$#';
+        $match = preg_match($pattern, $this->server_identifier, $matches);
+        $match = $match && version_compare('5.8', $matches[1], '<=');
+        $match = $match && version_compare('6.9', $matches[1], '>=');
+        $this->errorOnMultipleChannels = $match;
+
+        if (!$this->send_id_string_first) {
+            $start = microtime(true);
+            fputs($this->fsock, $this->identifier . "\r\n");
+            $elapsed = round(microtime(true) - $start, 4);
+            if (defined('NET_SSH2_LOGGING')) {
+                $this->append_log("-> (network: $elapsed)", $this->identifier . "\r\n");
+            }
+        }
+
+        $this->last_packet = microtime(true);
+
+        if (!$this->send_kex_first) {
+            $response = $this->get_binary_packet_or_close(NET_SSH2_MSG_KEXINIT);
+            $this->key_exchange($response);
+        }
+
+        if ($this->send_kex_first) {
+            $this->key_exchange();
+        }
+
+        $this->bitmap |= self::MASK_CONNECTED;
+
+        return true;
+    }
+
+    /**
+     * Generates the SSH identifier
+     *
+     * You should overwrite this method in your own class if you want to use another identifier
+     *
+     * @return string
+     */
+    private function generate_identifier()
+    {
+        $identifier = 'SSH-2.0-phpseclib_3.0';
+
+        $ext = [];
+        if (extension_loaded('sodium')) {
+            $ext[] = 'libsodium';
+        }
+
+        if (extension_loaded('openssl')) {
+            $ext[] = 'openssl';
+        } elseif (extension_loaded('mcrypt')) {
+            $ext[] = 'mcrypt';
+        }
+
+        if (extension_loaded('gmp')) {
+            $ext[] = 'gmp';
+        } elseif (extension_loaded('bcmath')) {
+            $ext[] = 'bcmath';
+        }
+
+        if (!empty($ext)) {
+            $identifier .= ' (' . implode(', ', $ext) . ')';
+        }
+
+        return $identifier;
+    }
+
+    /**
+     * Key Exchange
+     *
+     * @return bool
+     * @param string|bool $kexinit_payload_server optional
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @throws \RuntimeException on other errors
+     * @throws NoSupportedAlgorithmsException when none of the algorithms phpseclib has loaded are compatible
+     */
+    private function key_exchange($kexinit_payload_server = false)
+    {
+        $preferred = $this->preferred;
+        $send_kex = true;
+
+        $kex_algorithms = isset($preferred['kex']) ?
+            $preferred['kex'] :
+            SSH2::getSupportedKEXAlgorithms();
+        $server_host_key_algorithms = isset($preferred['hostkey']) ?
+            $preferred['hostkey'] :
+            SSH2::getSupportedHostKeyAlgorithms();
+        $s2c_encryption_algorithms = isset($preferred['server_to_client']['crypt']) ?
+            $preferred['server_to_client']['crypt'] :
+            SSH2::getSupportedEncryptionAlgorithms();
+        $c2s_encryption_algorithms = isset($preferred['client_to_server']['crypt']) ?
+            $preferred['client_to_server']['crypt'] :
+            SSH2::getSupportedEncryptionAlgorithms();
+        $s2c_mac_algorithms = isset($preferred['server_to_client']['mac']) ?
+            $preferred['server_to_client']['mac'] :
+            SSH2::getSupportedMACAlgorithms();
+        $c2s_mac_algorithms = isset($preferred['client_to_server']['mac']) ?
+            $preferred['client_to_server']['mac'] :
+            SSH2::getSupportedMACAlgorithms();
+        $s2c_compression_algorithms = isset($preferred['server_to_client']['comp']) ?
+            $preferred['server_to_client']['comp'] :
+            SSH2::getSupportedCompressionAlgorithms();
+        $c2s_compression_algorithms = isset($preferred['client_to_server']['comp']) ?
+            $preferred['client_to_server']['comp'] :
+            SSH2::getSupportedCompressionAlgorithms();
+
+        $kex_algorithms = array_merge($kex_algorithms, ['ext-info-c', 'kex-strict-c-v00@openssh.com']);
+
+        // some SSH servers have buggy implementations of some of the above algorithms
+        switch (true) {
+            case $this->server_identifier == 'SSH-2.0-SSHD':
+            case substr($this->server_identifier, 0, 13) == 'SSH-2.0-DLINK':
+                if (!isset($preferred['server_to_client']['mac'])) {
+                    $s2c_mac_algorithms = array_values(array_diff(
+                        $s2c_mac_algorithms,
+                        ['hmac-sha1-96', 'hmac-md5-96']
+                    ));
+                }
+                if (!isset($preferred['client_to_server']['mac'])) {
+                    $c2s_mac_algorithms = array_values(array_diff(
+                        $c2s_mac_algorithms,
+                        ['hmac-sha1-96', 'hmac-md5-96']
+                    ));
+                }
+                break;
+            case substr($this->server_identifier, 0, 24) == 'SSH-2.0-TurboFTP_SERVER_':
+                if (!isset($preferred['server_to_client']['crypt'])) {
+                    $s2c_encryption_algorithms = array_values(array_diff(
+                        $s2c_encryption_algorithms,
+                        ['aes128-gcm@openssh.com', 'aes256-gcm@openssh.com']
+                    ));
+                }
+                if (!isset($preferred['client_to_server']['crypt'])) {
+                    $c2s_encryption_algorithms = array_values(array_diff(
+                        $c2s_encryption_algorithms,
+                        ['aes128-gcm@openssh.com', 'aes256-gcm@openssh.com']
+                    ));
+                }
+        }
+
+        $client_cookie = Random::string(16);
+
+        $kexinit_payload_client = pack('Ca*', NET_SSH2_MSG_KEXINIT, $client_cookie);
+        $kexinit_payload_client .= Strings::packSSH2(
+            'L10bN',
+            $kex_algorithms,
+            $server_host_key_algorithms,
+            $c2s_encryption_algorithms,
+            $s2c_encryption_algorithms,
+            $c2s_mac_algorithms,
+            $s2c_mac_algorithms,
+            $c2s_compression_algorithms,
+            $s2c_compression_algorithms,
+            [], // language, client to server
+            [], // language, server to client
+            false, // first_kex_packet_follows
+            0 // reserved for future extension
+        );
+
+        if ($kexinit_payload_server === false) {
+            $this->send_binary_packet($kexinit_payload_client);
+
+            $this->extra_packets = 0;
+            $kexinit_payload_server = $this->get_binary_packet_or_close(NET_SSH2_MSG_KEXINIT);
+            $send_kex = false;
+        }
+
+        $response = $kexinit_payload_server;
+        Strings::shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT)
+        $server_cookie = Strings::shift($response, 16);
+
+        list(
+            $this->kex_algorithms,
+            $this->server_host_key_algorithms,
+            $this->encryption_algorithms_client_to_server,
+            $this->encryption_algorithms_server_to_client,
+            $this->mac_algorithms_client_to_server,
+            $this->mac_algorithms_server_to_client,
+            $this->compression_algorithms_client_to_server,
+            $this->compression_algorithms_server_to_client,
+            $this->languages_client_to_server,
+            $this->languages_server_to_client,
+            $first_kex_packet_follows
+        ) = Strings::unpackSSH2('L10C', $response);
+        if (in_array('kex-strict-s-v00@openssh.com', $this->kex_algorithms)) {
+            if ($this->session_id === false && $this->extra_packets) {
+                throw new \UnexpectedValueException('Possible Terrapin Attack detected');
+            }
+        }
+
+        $this->supported_private_key_algorithms = $this->server_host_key_algorithms;
+
+        if ($send_kex) {
+            $this->send_binary_packet($kexinit_payload_client);
+        }
+
+        // we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange
+
+        // we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the
+        // diffie-hellman key exchange as fast as possible
+        $decrypt = self::array_intersect_first($s2c_encryption_algorithms, $this->encryption_algorithms_server_to_client);
+        if (!$decrypt || ($decryptKeyLength = $this->encryption_algorithm_to_key_size($decrypt)) === null) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible server to client encryption algorithms found');
+        }
+
+        $encrypt = self::array_intersect_first($c2s_encryption_algorithms, $this->encryption_algorithms_client_to_server);
+        if (!$encrypt || ($encryptKeyLength = $this->encryption_algorithm_to_key_size($encrypt)) === null) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible client to server encryption algorithms found');
+        }
+
+        // through diffie-hellman key exchange a symmetric key is obtained
+        $this->kex_algorithm = self::array_intersect_first($kex_algorithms, $this->kex_algorithms);
+        if ($this->kex_algorithm === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible key exchange algorithms found');
+        }
+
+        $server_host_key_algorithm = self::array_intersect_first($server_host_key_algorithms, $this->server_host_key_algorithms);
+        if ($server_host_key_algorithm === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible server host key algorithms found');
+        }
+
+        $mac_algorithm_out = self::array_intersect_first($c2s_mac_algorithms, $this->mac_algorithms_client_to_server);
+        if ($mac_algorithm_out === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible client to server message authentication algorithms found');
+        }
+
+        $mac_algorithm_in = self::array_intersect_first($s2c_mac_algorithms, $this->mac_algorithms_server_to_client);
+        if ($mac_algorithm_in === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible server to client message authentication algorithms found');
+        }
+
+        $compression_map = [
+            'none' => self::NET_SSH2_COMPRESSION_NONE,
+            'zlib' => self::NET_SSH2_COMPRESSION_ZLIB,
+            'zlib@openssh.com' => self::NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH
+        ];
+
+        $compression_algorithm_in = self::array_intersect_first($s2c_compression_algorithms, $this->compression_algorithms_server_to_client);
+        if ($compression_algorithm_in === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible server to client compression algorithms found');
+        }
+        $this->decompress = $compression_map[$compression_algorithm_in];
+
+        $compression_algorithm_out = self::array_intersect_first($c2s_compression_algorithms, $this->compression_algorithms_client_to_server);
+        if ($compression_algorithm_out === false) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+            throw new NoSupportedAlgorithmsException('No compatible client to server compression algorithms found');
+        }
+        $this->compress = $compression_map[$compression_algorithm_out];
+
+        switch ($this->kex_algorithm) {
+            case 'diffie-hellman-group15-sha512':
+            case 'diffie-hellman-group16-sha512':
+            case 'diffie-hellman-group17-sha512':
+            case 'diffie-hellman-group18-sha512':
+            case 'ecdh-sha2-nistp521':
+                $kexHash = new Hash('sha512');
+                break;
+            case 'ecdh-sha2-nistp384':
+                $kexHash = new Hash('sha384');
+                break;
+            case 'diffie-hellman-group-exchange-sha256':
+            case 'diffie-hellman-group14-sha256':
+            case 'ecdh-sha2-nistp256':
+            case 'curve25519-sha256@libssh.org':
+            case 'curve25519-sha256':
+                $kexHash = new Hash('sha256');
+                break;
+            default:
+                $kexHash = new Hash('sha1');
+        }
+
+        // Only relevant in diffie-hellman-group-exchange-sha{1,256}, otherwise empty.
+
+        $exchange_hash_rfc4419 = '';
+
+        if (strpos($this->kex_algorithm, 'curve25519-sha256') === 0 || strpos($this->kex_algorithm, 'ecdh-sha2-nistp') === 0) {
+            $curve = strpos($this->kex_algorithm, 'curve25519-sha256') === 0 ?
+                'Curve25519' :
+                substr($this->kex_algorithm, 10);
+            $ourPrivate = EC::createKey($curve);
+            $ourPublicBytes = $ourPrivate->getPublicKey()->getEncodedCoordinates();
+            $clientKexInitMessage = 'NET_SSH2_MSG_KEX_ECDH_INIT';
+            $serverKexReplyMessage = 'NET_SSH2_MSG_KEX_ECDH_REPLY';
+        } else {
+            if (strpos($this->kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
+                $dh_group_sizes_packed = pack(
+                    'NNN',
+                    $this->kex_dh_group_size_min,
+                    $this->kex_dh_group_size_preferred,
+                    $this->kex_dh_group_size_max
+                );
+                $packet = pack(
+                    'Ca*',
+                    NET_SSH2_MSG_KEXDH_GEX_REQUEST,
+                    $dh_group_sizes_packed
+                );
+                $this->send_binary_packet($packet);
+                $this->updateLogHistory('UNKNOWN (34)', 'NET_SSH2_MSG_KEXDH_GEX_REQUEST');
+
+                $response = $this->get_binary_packet_or_close(NET_SSH2_MSG_KEXDH_GEX_GROUP);
+                list($type, $primeBytes, $gBytes) = Strings::unpackSSH2('Css', $response);
+                $this->updateLogHistory('NET_SSH2_MSG_KEXDH_REPLY', 'NET_SSH2_MSG_KEXDH_GEX_GROUP');
+                $prime = new BigInteger($primeBytes, -256);
+                $g = new BigInteger($gBytes, -256);
+
+                $exchange_hash_rfc4419 = $dh_group_sizes_packed . Strings::packSSH2(
+                    'ss',
+                    $primeBytes,
+                    $gBytes
+                );
+
+                $params = DH::createParameters($prime, $g);
+                $clientKexInitMessage = 'NET_SSH2_MSG_KEXDH_GEX_INIT';
+                $serverKexReplyMessage = 'NET_SSH2_MSG_KEXDH_GEX_REPLY';
+            } else {
+                $params = DH::createParameters($this->kex_algorithm);
+                $clientKexInitMessage = 'NET_SSH2_MSG_KEXDH_INIT';
+                $serverKexReplyMessage = 'NET_SSH2_MSG_KEXDH_REPLY';
+            }
+
+            $keyLength = min($kexHash->getLengthInBytes(), max($encryptKeyLength, $decryptKeyLength));
+
+            $ourPrivate = DH::createKey($params, 16 * $keyLength); // 2 * 8 * $keyLength
+            $ourPublic = $ourPrivate->getPublicKey()->toBigInteger();
+            $ourPublicBytes = $ourPublic->toBytes(true);
+        }
+
+        $data = pack('CNa*', constant($clientKexInitMessage), strlen($ourPublicBytes), $ourPublicBytes);
+
+        $this->send_binary_packet($data);
+
+        switch ($clientKexInitMessage) {
+            case 'NET_SSH2_MSG_KEX_ECDH_INIT':
+                $this->updateLogHistory('NET_SSH2_MSG_KEXDH_INIT', 'NET_SSH2_MSG_KEX_ECDH_INIT');
+                break;
+            case 'NET_SSH2_MSG_KEXDH_GEX_INIT':
+                $this->updateLogHistory('UNKNOWN (32)', 'NET_SSH2_MSG_KEXDH_GEX_INIT');
+        }
+
+        $response = $this->get_binary_packet_or_close(constant($serverKexReplyMessage));
+
+        list(
+            $type,
+            $server_public_host_key,
+            $theirPublicBytes,
+            $this->signature
+        ) = Strings::unpackSSH2('Csss', $response);
+
+        switch ($serverKexReplyMessage) {
+            case 'NET_SSH2_MSG_KEX_ECDH_REPLY':
+                $this->updateLogHistory('NET_SSH2_MSG_KEXDH_REPLY', 'NET_SSH2_MSG_KEX_ECDH_REPLY');
+                break;
+            case 'NET_SSH2_MSG_KEXDH_GEX_REPLY':
+                $this->updateLogHistory('UNKNOWN (33)', 'NET_SSH2_MSG_KEXDH_GEX_REPLY');
+        }
+
+        $this->server_public_host_key = $server_public_host_key;
+        list($public_key_format) = Strings::unpackSSH2('s', $server_public_host_key);
+        if (strlen($this->signature) < 4) {
+            throw new \LengthException('The signature needs at least four bytes');
+        }
+        $temp = unpack('Nlength', substr($this->signature, 0, 4));
+        $this->signature_format = substr($this->signature, 4, $temp['length']);
+
+        $keyBytes = DH::computeSecret($ourPrivate, $theirPublicBytes);
+        if (($keyBytes & "\xFF\x80") === "\x00\x00") {
+            $keyBytes = substr($keyBytes, 1);
+        } elseif (($keyBytes[0] & "\x80") === "\x80") {
+            $keyBytes = "\0$keyBytes";
+        }
+
+        $this->exchange_hash = Strings::packSSH2(
+            's5',
+            $this->identifier,
+            $this->server_identifier,
+            $kexinit_payload_client,
+            $kexinit_payload_server,
+            $this->server_public_host_key
+        );
+        $this->exchange_hash .= $exchange_hash_rfc4419;
+        $this->exchange_hash .= Strings::packSSH2(
+            's3',
+            $ourPublicBytes,
+            $theirPublicBytes,
+            $keyBytes
+        );
+
+        $this->exchange_hash = $kexHash->hash($this->exchange_hash);
+
+        if ($this->session_id === false) {
+            $this->session_id = $this->exchange_hash;
+        }
+
+        switch ($server_host_key_algorithm) {
+            case 'rsa-sha2-256':
+            case 'rsa-sha2-512':
+            //case 'ssh-rsa':
+                $expected_key_format = 'ssh-rsa';
+                break;
+            default:
+                $expected_key_format = $server_host_key_algorithm;
+        }
+        if ($public_key_format != $expected_key_format || $this->signature_format != $server_host_key_algorithm) {
+            switch (true) {
+                case $this->signature_format == $server_host_key_algorithm:
+                case $server_host_key_algorithm != 'rsa-sha2-256' && $server_host_key_algorithm != 'rsa-sha2-512':
+                case $this->signature_format != 'ssh-rsa':
+                    $this->disconnect_helper(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+                    throw new \RuntimeException('Server Host Key Algorithm Mismatch (' . $this->signature_format . ' vs ' . $server_host_key_algorithm . ')');
+            }
+        }
+
+        $packet = pack('C', NET_SSH2_MSG_NEWKEYS);
+        $this->send_binary_packet($packet);
+        $response = $this->get_binary_packet_or_close(NET_SSH2_MSG_NEWKEYS);
+
+        if (in_array('kex-strict-s-v00@openssh.com', $this->kex_algorithms)) {
+            $this->get_seq_no = $this->send_seq_no = 0;
+        }
+
+        $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
+
+        $this->encrypt = self::encryption_algorithm_to_crypt_instance($encrypt);
+        if ($this->encrypt) {
+            if (self::$crypto_engine) {
+                $this->encrypt->setPreferredEngine(self::$crypto_engine);
+            }
+            if ($this->encrypt->getBlockLengthInBytes()) {
+                $this->encrypt_block_size = $this->encrypt->getBlockLengthInBytes();
+            }
+            $this->encrypt->disablePadding();
+
+            if ($this->encrypt->usesIV()) {
+                $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
+                while ($this->encrypt_block_size > strlen($iv)) {
+                    $iv .= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
+                }
+                $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size));
+            }
+
+            switch ($encrypt) {
+                case 'aes128-gcm@openssh.com':
+                case 'aes256-gcm@openssh.com':
+                    $nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
+                    $this->encryptFixedPart = substr($nonce, 0, 4);
+                    $this->encryptInvocationCounter = substr($nonce, 4, 8);
+                    // fall-through
+                case 'chacha20-poly1305@openssh.com':
+                    break;
+                default:
+                    $this->encrypt->enableContinuousBuffer();
+            }
+
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id);
+            while ($encryptKeyLength > strlen($key)) {
+                $key .= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            switch ($encrypt) {
+                case 'chacha20-poly1305@openssh.com':
+                    $encryptKeyLength = 32;
+                    $this->lengthEncrypt = self::encryption_algorithm_to_crypt_instance($encrypt);
+                    $this->lengthEncrypt->setKey(substr($key, 32, 32));
+            }
+            $this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
+            $this->encryptName = $encrypt;
+        }
+
+        $this->decrypt = self::encryption_algorithm_to_crypt_instance($decrypt);
+        if ($this->decrypt) {
+            if (self::$crypto_engine) {
+                $this->decrypt->setPreferredEngine(self::$crypto_engine);
+            }
+            if ($this->decrypt->getBlockLengthInBytes()) {
+                $this->decrypt_block_size = $this->decrypt->getBlockLengthInBytes();
+            }
+            $this->decrypt->disablePadding();
+
+            if ($this->decrypt->usesIV()) {
+                $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
+                while ($this->decrypt_block_size > strlen($iv)) {
+                    $iv .= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
+                }
+                $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size));
+            }
+
+            switch ($decrypt) {
+                case 'aes128-gcm@openssh.com':
+                case 'aes256-gcm@openssh.com':
+                    // see https://tools.ietf.org/html/rfc5647#section-7.1
+                    $nonce = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
+                    $this->decryptFixedPart = substr($nonce, 0, 4);
+                    $this->decryptInvocationCounter = substr($nonce, 4, 8);
+                    // fall-through
+                case 'chacha20-poly1305@openssh.com':
+                    break;
+                default:
+                    $this->decrypt->enableContinuousBuffer();
+            }
+
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id);
+            while ($decryptKeyLength > strlen($key)) {
+                $key .= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            switch ($decrypt) {
+                case 'chacha20-poly1305@openssh.com':
+                    $decryptKeyLength = 32;
+                    $this->lengthDecrypt = self::encryption_algorithm_to_crypt_instance($decrypt);
+                    $this->lengthDecrypt->setKey(substr($key, 32, 32));
+            }
+            $this->decrypt->setKey(substr($key, 0, $decryptKeyLength));
+            $this->decryptName = $decrypt;
+        }
+
+        /* The "arcfour128" algorithm is the RC4 cipher, as described in
+           [SCHNEIER], using a 128-bit key.  The first 1536 bytes of keystream
+           generated by the cipher MUST be discarded, and the first byte of the
+           first encrypted packet MUST be encrypted using the 1537th byte of
+           keystream.
+
+           -- http://tools.ietf.org/html/rfc4345#section-4 */
+        if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') {
+            $this->encrypt->encrypt(str_repeat("\0", 1536));
+        }
+        if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') {
+            $this->decrypt->decrypt(str_repeat("\0", 1536));
+        }
+
+        if (!$this->encrypt->usesNonce()) {
+            list($this->hmac_create, $createKeyLength) = self::mac_algorithm_to_hash_instance($mac_algorithm_out);
+        } else {
+            $this->hmac_create = new \stdClass();
+            $this->hmac_create_name = $mac_algorithm_out;
+            //$mac_algorithm_out = 'none';
+            $createKeyLength = 0;
+        }
+
+        if ($this->hmac_create instanceof Hash) {
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id);
+            while ($createKeyLength > strlen($key)) {
+                $key .= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            $this->hmac_create->setKey(substr($key, 0, $createKeyLength));
+            $this->hmac_create_name = $mac_algorithm_out;
+            $this->hmac_create_etm = preg_match('#-etm@openssh\.com$#', $mac_algorithm_out);
+        }
+
+        if (!$this->decrypt->usesNonce()) {
+            list($this->hmac_check, $checkKeyLength) = self::mac_algorithm_to_hash_instance($mac_algorithm_in);
+            $this->hmac_size = $this->hmac_check->getLengthInBytes();
+        } else {
+            $this->hmac_check = new \stdClass();
+            $this->hmac_check_name = $mac_algorithm_in;
+            //$mac_algorithm_in = 'none';
+            $checkKeyLength = 0;
+            $this->hmac_size = 0;
+        }
+
+        if ($this->hmac_check instanceof Hash) {
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id);
+            while ($checkKeyLength > strlen($key)) {
+                $key .= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            $this->hmac_check->setKey(substr($key, 0, $checkKeyLength));
+            $this->hmac_check_name = $mac_algorithm_in;
+            $this->hmac_check_etm = preg_match('#-etm@openssh\.com$#', $mac_algorithm_in);
+        }
+
+        $this->regenerate_compression_context = $this->regenerate_decompression_context = true;
+
+        return true;
+    }
+
+    /**
+     * Maps an encryption algorithm name to the number of key bytes.
+     *
+     * @param string $algorithm Name of the encryption algorithm
+     * @return int|null Number of bytes as an integer or null for unknown
+     */
+    private function encryption_algorithm_to_key_size($algorithm)
+    {
+        if ($this->bad_key_size_fix && self::bad_algorithm_candidate($algorithm)) {
+            return 16;
+        }
+
+        switch ($algorithm) {
+            case 'none':
+                return 0;
+            case 'aes128-gcm@openssh.com':
+            case 'aes128-cbc':
+            case 'aes128-ctr':
+            case 'arcfour':
+            case 'arcfour128':
+            case 'blowfish-cbc':
+            case 'blowfish-ctr':
+            case 'twofish128-cbc':
+            case 'twofish128-ctr':
+                return 16;
+            case '3des-cbc':
+            case '3des-ctr':
+            case 'aes192-cbc':
+            case 'aes192-ctr':
+            case 'twofish192-cbc':
+            case 'twofish192-ctr':
+                return 24;
+            case 'aes256-gcm@openssh.com':
+            case 'aes256-cbc':
+            case 'aes256-ctr':
+            case 'arcfour256':
+            case 'twofish-cbc':
+            case 'twofish256-cbc':
+            case 'twofish256-ctr':
+                return 32;
+            case 'chacha20-poly1305@openssh.com':
+                return 64;
+        }
+        return null;
+    }
+
+    /**
+     * Maps an encryption algorithm name to an instance of a subclass of
+     * \phpseclib3\Crypt\Common\SymmetricKey.
+     *
+     * @param string $algorithm Name of the encryption algorithm
+     * @return SymmetricKey|null
+     */
+    private static function encryption_algorithm_to_crypt_instance($algorithm)
+    {
+        switch ($algorithm) {
+            case '3des-cbc':
+                return new TripleDES('cbc');
+            case '3des-ctr':
+                return new TripleDES('ctr');
+            case 'aes256-cbc':
+            case 'aes192-cbc':
+            case 'aes128-cbc':
+                return new Rijndael('cbc');
+            case 'aes256-ctr':
+            case 'aes192-ctr':
+            case 'aes128-ctr':
+                return new Rijndael('ctr');
+            case 'blowfish-cbc':
+                return new Blowfish('cbc');
+            case 'blowfish-ctr':
+                return new Blowfish('ctr');
+            case 'twofish128-cbc':
+            case 'twofish192-cbc':
+            case 'twofish256-cbc':
+            case 'twofish-cbc':
+                return new Twofish('cbc');
+            case 'twofish128-ctr':
+            case 'twofish192-ctr':
+            case 'twofish256-ctr':
+                return new Twofish('ctr');
+            case 'arcfour':
+            case 'arcfour128':
+            case 'arcfour256':
+                return new RC4();
+            case 'aes128-gcm@openssh.com':
+            case 'aes256-gcm@openssh.com':
+                return new Rijndael('gcm');
+            case 'chacha20-poly1305@openssh.com':
+                return new ChaCha20();
+        }
+        return null;
+    }
+
+    /**
+     * Maps an encryption algorithm name to an instance of a subclass of
+     * \phpseclib3\Crypt\Hash.
+     *
+     * @param string $algorithm Name of the encryption algorithm
+     * @return array{Hash, int}|null
+     */
+    private static function mac_algorithm_to_hash_instance($algorithm)
+    {
+        switch ($algorithm) {
+            case 'umac-64@openssh.com':
+            case 'umac-64-etm@openssh.com':
+                return [new Hash('umac-64'), 16];
+            case 'umac-128@openssh.com':
+            case 'umac-128-etm@openssh.com':
+                return [new Hash('umac-128'), 16];
+            case 'hmac-sha2-512':
+            case 'hmac-sha2-512-etm@openssh.com':
+                return [new Hash('sha512'), 64];
+            case 'hmac-sha2-256':
+            case 'hmac-sha2-256-etm@openssh.com':
+                return [new Hash('sha256'), 32];
+            case 'hmac-sha1':
+            case 'hmac-sha1-etm@openssh.com':
+                return [new Hash('sha1'), 20];
+            case 'hmac-sha1-96':
+                return [new Hash('sha1-96'), 20];
+            case 'hmac-md5':
+                return [new Hash('md5'), 16];
+            case 'hmac-md5-96':
+                return [new Hash('md5-96'), 16];
+        }
+    }
+
+    /**
+     * Tests whether or not proposed algorithm has a potential for issues
+     *
+     * @link https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ssh2-aesctr-openssh.html
+     * @link https://bugzilla.mindrot.org/show_bug.cgi?id=1291
+     * @param string $algorithm Name of the encryption algorithm
+     * @return bool
+     */
+    private static function bad_algorithm_candidate($algorithm)
+    {
+        switch ($algorithm) {
+            case 'arcfour256':
+            case 'aes192-ctr':
+            case 'aes256-ctr':
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login
+     *
+     * The $password parameter can be a plaintext password, a \phpseclib3\Crypt\RSA|EC|DSA object, a \phpseclib3\System\SSH\Agent object or an array
+     *
+     * @param string $username
+     * @param string|PrivateKey|array[]|Agent|null ...$args
+     * @return bool
+     * @see self::_login()
+     */
+    public function login($username, ...$args)
+    {
+        if (!$this->login_credentials_finalized) {
+            $this->auth[] = func_get_args();
+        }
+
+        // try logging with 'none' as an authentication method first since that's what
+        // PuTTY does
+        if (substr($this->server_identifier, 0, 15) != 'SSH-2.0-CoreFTP' && $this->auth_methods_to_continue === null) {
+            if ($this->sublogin($username)) {
+                return true;
+            }
+            if (!count($args)) {
+                return false;
+            }
+        }
+        return $this->sublogin($username, ...$args);
+    }
+
+    /**
+     * Login Helper
+     *
+     * @param string $username
+     * @param string|PrivateKey|array[]|Agent|null ...$args
+     * @return bool
+     * @see self::_login_helper()
+     */
+    protected function sublogin($username, ...$args)
+    {
+        if (!($this->bitmap & self::MASK_CONSTRUCTOR)) {
+            $this->connect();
+        }
+
+        if (empty($args)) {
+            return $this->login_helper($username);
+        }
+
+        foreach ($args as $arg) {
+            switch (true) {
+                case $arg instanceof PublicKey:
+                    throw new \UnexpectedValueException('A PublicKey object was passed to the login method instead of a PrivateKey object');
+                case $arg instanceof PrivateKey:
+                case $arg instanceof Agent:
+                case is_array($arg):
+                case Strings::is_stringable($arg):
+                    break;
+                default:
+                    throw new \UnexpectedValueException('$password needs to either be an instance of \phpseclib3\Crypt\Common\PrivateKey, \System\SSH\Agent, an array or a string');
+            }
+        }
+
+        while (count($args)) {
+            if (!$this->auth_methods_to_continue || !$this->smartMFA) {
+                $newargs = $args;
+                $args = [];
+            } else {
+                $newargs = [];
+                foreach ($this->auth_methods_to_continue as $method) {
+                    switch ($method) {
+                        case 'publickey':
+                            foreach ($args as $key => $arg) {
+                                if ($arg instanceof PrivateKey || $arg instanceof Agent) {
+                                    $newargs[] = $arg;
+                                    unset($args[$key]);
+                                    break;
+                                }
+                            }
+                            break;
+                        case 'keyboard-interactive':
+                            $hasArray = $hasString = false;
+                            foreach ($args as $arg) {
+                                if ($hasArray || is_array($arg)) {
+                                    $hasArray = true;
+                                    break;
+                                }
+                                if ($hasString || Strings::is_stringable($arg)) {
+                                    $hasString = true;
+                                    break;
+                                }
+                            }
+                            if ($hasArray && $hasString) {
+                                foreach ($args as $key => $arg) {
+                                    if (is_array($arg)) {
+                                        $newargs[] = $arg;
+                                        break 2;
+                                    }
+                                }
+                            }
+                            // fall-through
+                        case 'password':
+                            foreach ($args as $key => $arg) {
+                                $newargs[] = $arg;
+                                unset($args[$key]);
+                                break;
+                            }
+                    }
+                }
+            }
+
+            if (!count($newargs)) {
+                return false;
+            }
+
+            foreach ($newargs as $arg) {
+                if ($this->login_helper($username, $arg)) {
+                    $this->login_credentials_finalized = true;
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Login Helper
+     *
+     * {@internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
+     *           by sending dummy SSH_MSG_IGNORE messages.}
+     *
+     * @param string $username
+     * @param string|AsymmetricKey|array[]|Agent|null ...$args
+     * @return bool
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @throws \RuntimeException on other errors
+     */
+    private function login_helper($username, $password = null)
+    {
+        if (!($this->bitmap & self::MASK_CONNECTED)) {
+            return false;
+        }
+
+        if (!($this->bitmap & self::MASK_LOGIN_REQ)) {
+            $packet = Strings::packSSH2('Cs', NET_SSH2_MSG_SERVICE_REQUEST, 'ssh-userauth');
+            $this->send_binary_packet($packet);
+
+            try {
+                $response = $this->get_binary_packet_or_close(NET_SSH2_MSG_SERVICE_ACCEPT);
+            } catch (InvalidPacketLengthException $e) {
+                // the first opportunity to encounter the "bad key size" error
+                if (!$this->bad_key_size_fix && $this->decryptName != null && self::bad_algorithm_candidate($this->decryptName)) {
+                    // bad_key_size_fix is only ever re-assigned to true here
+                    // retry the connection with that new setting but we'll
+                    // only try it once.
+                    $this->bad_key_size_fix = true;
+                    return $this->reconnect();
+                }
+                throw $e;
+            }
+
+            list($type) = Strings::unpackSSH2('C', $response);
+            list($service) = Strings::unpackSSH2('s', $response);
+
+            if ($service != 'ssh-userauth') {
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_PROTOCOL_ERROR);
+                throw new \UnexpectedValueException('Expected SSH_MSG_SERVICE_ACCEPT');
+            }
+            $this->bitmap |= self::MASK_LOGIN_REQ;
+        }
+
+        if (strlen($this->last_interactive_response)) {
+            return !Strings::is_stringable($password) && !is_array($password) ? false : $this->keyboard_interactive_process($password);
+        }
+
+        if ($password instanceof PrivateKey) {
+            return $this->privatekey_login($username, $password);
+        }
+
+        if ($password instanceof Agent) {
+            return $this->ssh_agent_login($username, $password);
+        }
+
+        if (is_array($password)) {
+            if ($this->keyboard_interactive_login($username, $password)) {
+                $this->bitmap |= self::MASK_LOGIN;
+                return true;
+            }
+            return false;
+        }
+
+        if (!isset($password)) {
+            $packet = Strings::packSSH2(
+                'Cs3',
+                NET_SSH2_MSG_USERAUTH_REQUEST,
+                $username,
+                'ssh-connection',
+                'none'
+            );
+
+            $this->send_binary_packet($packet);
+
+            $response = $this->get_binary_packet_or_close();
+
+            list($type) = Strings::unpackSSH2('C', $response);
+            switch ($type) {
+                case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                    $this->bitmap |= self::MASK_LOGIN;
+                    return true;
+                case NET_SSH2_MSG_USERAUTH_FAILURE:
+                    list($auth_methods) = Strings::unpackSSH2('L', $response);
+                    $this->auth_methods_to_continue = $auth_methods;
+                    // fall-through
+                default:
+                    return false;
+            }
+        }
+
+        $packet = Strings::packSSH2(
+            'Cs3bs',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            $username,
+            'ssh-connection',
+            'password',
+            false,
+            $password
+        );
+
+        // remove the username and password from the logged packet
+        if (!defined('NET_SSH2_LOGGING')) {
+            $logged = null;
+        } else {
+            $logged = Strings::packSSH2(
+                'Cs3bs',
+                NET_SSH2_MSG_USERAUTH_REQUEST,
+                $username,
+                'ssh-connection',
+                'password',
+                false,
+                'password'
+            );
+        }
+
+        $this->send_binary_packet($packet, $logged);
+
+        $response = $this->get_binary_packet_or_close();
+        list($type) = Strings::unpackSSH2('C', $response);
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed
+                $this->updateLogHistory('UNKNOWN (60)', 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ');
+
+                list($message) = Strings::unpackSSH2('s', $response);
+                $this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . $message;
+
+                return $this->disconnect_helper(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                // can we use keyboard-interactive authentication?  if not then either the login is bad or the server employees
+                // multi-factor authentication
+                list($auth_methods, $partial_success) = Strings::unpackSSH2('Lb', $response);
+                $this->auth_methods_to_continue = $auth_methods;
+                if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) {
+                    if ($this->keyboard_interactive_login($username, $password)) {
+                        $this->bitmap |= self::MASK_LOGIN;
+                        return true;
+                    }
+                    return false;
+                }
+                return false;
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                $this->bitmap |= self::MASK_LOGIN;
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login via keyboard-interactive authentication
+     *
+     * See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details.  This is not a full-featured keyboard-interactive authenticator.
+     *
+     * @param string $username
+     * @param string|array $password
+     * @return bool
+     */
+    private function keyboard_interactive_login($username, $password)
+    {
+        $packet = Strings::packSSH2(
+            'Cs5',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            $username,
+            'ssh-connection',
+            'keyboard-interactive',
+            '', // language tag
+            '' // submethods
+        );
+        $this->send_binary_packet($packet);
+
+        return $this->keyboard_interactive_process($password);
+    }
+
+    /**
+     * Handle the keyboard-interactive requests / responses.
+     *
+     * @param string|array ...$responses
+     * @return bool
+     * @throws \RuntimeException on connection error
+     */
+    private function keyboard_interactive_process(...$responses)
+    {
+        if (strlen($this->last_interactive_response)) {
+            $response = $this->last_interactive_response;
+        } else {
+            $orig = $response = $this->get_binary_packet_or_close();
+        }
+
+        list($type) = Strings::unpackSSH2('C', $response);
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_INFO_REQUEST:
+                list(
+                    , // name; may be empty
+                    , // instruction; may be empty
+                    , // language tag; may be empty
+                    $num_prompts
+                ) = Strings::unpackSSH2('s3N', $response);
+
+                for ($i = 0; $i < count($responses); $i++) {
+                    if (is_array($responses[$i])) {
+                        foreach ($responses[$i] as $key => $value) {
+                            $this->keyboard_requests_responses[$key] = $value;
+                        }
+                        unset($responses[$i]);
+                    }
+                }
+                $responses = array_values($responses);
+
+                if (isset($this->keyboard_requests_responses)) {
+                    for ($i = 0; $i < $num_prompts; $i++) {
+                        list(
+                            $prompt, // prompt - ie. "Password: "; must not be empty
+                            // echo
+                        ) = Strings::unpackSSH2('sC', $response);
+                        foreach ($this->keyboard_requests_responses as $key => $value) {
+                            if (substr($prompt, 0, strlen($key)) == $key) {
+                                $responses[] = $value;
+                                break;
+                            }
+                        }
+                    }
+                }
+
+                // see http://tools.ietf.org/html/rfc4256#section-3.2
+                if (strlen($this->last_interactive_response)) {
+                    $this->last_interactive_response = '';
+                } else {
+                    $this->updateLogHistory('UNKNOWN (60)', 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST');
+                }
+
+                if (!count($responses) && $num_prompts) {
+                    $this->last_interactive_response = $orig;
+                    return false;
+                }
+
+                /*
+                   After obtaining the requested information from the user, the client
+                   MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message.
+                */
+                // see http://tools.ietf.org/html/rfc4256#section-3.4
+                $packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses));
+                for ($i = 0; $i < count($responses); $i++) {
+                    $packet .= Strings::packSSH2('s', $responses[$i]);
+                    $logged .= Strings::packSSH2('s', 'dummy-answer');
+                }
+
+                $this->send_binary_packet($packet, $logged);
+
+                $this->updateLogHistory('UNKNOWN (61)', 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE');
+
+                /*
+                   After receiving the response, the server MUST send either an
+                   SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another
+                   SSH_MSG_USERAUTH_INFO_REQUEST message.
+                */
+                // maybe phpseclib should force close the connection after x request / responses?  unless something like that is done
+                // there could be an infinite loop of request / responses.
+                return $this->keyboard_interactive_process();
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                return true;
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                list($auth_methods) = Strings::unpackSSH2('L', $response);
+                $this->auth_methods_to_continue = $auth_methods;
+                return false;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login with an ssh-agent provided key
+     *
+     * @param string $username
+     * @param Agent $agent
+     * @return bool
+     */
+    private function ssh_agent_login($username, Agent $agent)
+    {
+        $this->agent = $agent;
+        $keys = $agent->requestIdentities();
+        $orig_algorithms = $this->supported_private_key_algorithms;
+        foreach ($keys as $key) {
+            if ($this->privatekey_login($username, $key)) {
+                return true;
+            }
+            $this->supported_private_key_algorithms = $orig_algorithms;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login with an RSA private key
+     *
+     * {@internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
+     *           by sending dummy SSH_MSG_IGNORE messages.}
+     *
+     * @param string $username
+     * @param PrivateKey $privatekey
+     * @return bool
+     * @throws \RuntimeException on connection error
+     */
+    private function privatekey_login($username, PrivateKey $privatekey)
+    {
+        $publickey = $privatekey->getPublicKey();
+
+        if ($publickey instanceof RSA) {
+            $privatekey = $privatekey->withPadding(RSA::SIGNATURE_PKCS1);
+            $algos = ['rsa-sha2-256', 'rsa-sha2-512', 'ssh-rsa'];
+            if (isset($this->preferred['hostkey'])) {
+                $algos = array_intersect($algos, $this->preferred['hostkey']);
+            }
+            $algo = self::array_intersect_first($algos, $this->supported_private_key_algorithms);
+            switch ($algo) {
+                case 'rsa-sha2-512':
+                    $hash = 'sha512';
+                    $signatureType = 'rsa-sha2-512';
+                    break;
+                case 'rsa-sha2-256':
+                    $hash = 'sha256';
+                    $signatureType = 'rsa-sha2-256';
+                    break;
+                //case 'ssh-rsa':
+                default:
+                    $hash = 'sha1';
+                    $signatureType = 'ssh-rsa';
+            }
+        } elseif ($publickey instanceof EC) {
+            $privatekey = $privatekey->withSignatureFormat('SSH2');
+            $curveName = $privatekey->getCurve();
+            switch ($curveName) {
+                case 'Ed25519':
+                    $hash = 'sha512';
+                    $signatureType = 'ssh-ed25519';
+                    break;
+                case 'secp256r1': // nistp256
+                    $hash = 'sha256';
+                    $signatureType = 'ecdsa-sha2-nistp256';
+                    break;
+                case 'secp384r1': // nistp384
+                    $hash = 'sha384';
+                    $signatureType = 'ecdsa-sha2-nistp384';
+                    break;
+                case 'secp521r1': // nistp521
+                    $hash = 'sha512';
+                    $signatureType = 'ecdsa-sha2-nistp521';
+                    break;
+                default:
+                    if (is_array($curveName)) {
+                        throw new UnsupportedCurveException('Specified Curves are not supported by SSH2');
+                    }
+                    throw new UnsupportedCurveException('Named Curve of ' . $curveName . ' is not supported by phpseclib3\'s SSH2 implementation');
+            }
+        } elseif ($publickey instanceof DSA) {
+            $privatekey = $privatekey->withSignatureFormat('SSH2');
+            $hash = 'sha1';
+            $signatureType = 'ssh-dss';
+        } else {
+            throw new UnsupportedAlgorithmException('Please use either an RSA key, an EC one or a DSA key');
+        }
+
+        $publickeyStr = $publickey->toString('OpenSSH', ['binary' => true]);
+
+        $part1 = Strings::packSSH2(
+            'Csss',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            $username,
+            'ssh-connection',
+            'publickey'
+        );
+        $part2 = Strings::packSSH2('ss', $signatureType, $publickeyStr);
+
+        $packet = $part1 . chr(0) . $part2;
+        $this->send_binary_packet($packet);
+
+        $response = $this->get_binary_packet_or_close(
+            NET_SSH2_MSG_USERAUTH_SUCCESS,
+            NET_SSH2_MSG_USERAUTH_FAILURE,
+            NET_SSH2_MSG_USERAUTH_PK_OK
+        );
+
+        list($type) = Strings::unpackSSH2('C', $response);
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                list($auth_methods) = Strings::unpackSSH2('L', $response);
+                if (in_array('publickey', $auth_methods) && substr($signatureType, 0, 9) == 'rsa-sha2-') {
+                    $this->supported_private_key_algorithms = array_diff($this->supported_private_key_algorithms, ['rsa-sha2-256', 'rsa-sha2-512']);
+                    return $this->privatekey_login($username, $privatekey);
+                }
+                $this->auth_methods_to_continue = $auth_methods;
+                $this->errors[] = 'SSH_MSG_USERAUTH_FAILURE';
+                return false;
+            case NET_SSH2_MSG_USERAUTH_PK_OK:
+                // we'll just take it on faith that the public key blob and the public key algorithm name are as
+                // they should be
+                $this->updateLogHistory('UNKNOWN (60)', 'NET_SSH2_MSG_USERAUTH_PK_OK');
+                break;
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                $this->bitmap |= self::MASK_LOGIN;
+                return true;
+        }
+
+        $packet = $part1 . chr(1) . $part2;
+        $privatekey = $privatekey->withHash($hash);
+        $signature = $privatekey->sign(Strings::packSSH2('s', $this->session_id) . $packet);
+        if ($publickey instanceof RSA) {
+            $signature = Strings::packSSH2('ss', $signatureType, $signature);
+        }
+        $packet .= Strings::packSSH2('s', $signature);
+
+        $this->send_binary_packet($packet);
+
+        $response = $this->get_binary_packet_or_close(
+            NET_SSH2_MSG_USERAUTH_SUCCESS,
+            NET_SSH2_MSG_USERAUTH_FAILURE
+        );
+
+        list($type) = Strings::unpackSSH2('C', $response);
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                // either the login is bad or the server employs multi-factor authentication
+                list($auth_methods) = Strings::unpackSSH2('L', $response);
+                $this->auth_methods_to_continue = $auth_methods;
+                return false;
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                $this->bitmap |= self::MASK_LOGIN;
+                return true;
+        }
+    }
+
+    /**
+     * Return the currently configured timeout
+     *
+     * @return int
+     */
+    public function getTimeout()
+    {
+        return $this->timeout;
+    }
+
+    /**
+     * Set Timeout
+     *
+     * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely.  setTimeout() makes it so it'll timeout.
+     * Setting $timeout to false or 0 will revert to the default socket timeout.
+     *
+     * @param mixed $timeout
+     */
+    public function setTimeout($timeout)
+    {
+        $this->timeout = $this->curTimeout = $timeout;
+    }
+
+    /**
+     * Set Keep Alive
+     *
+     * Sends an SSH2_MSG_IGNORE message every x seconds, if x is a positive non-zero number.
+     *
+     * @param int $interval
+     */
+    public function setKeepAlive($interval)
+    {
+        $this->keepAlive = $interval;
+    }
+
+    /**
+     * Get the output from stdError
+     *
+     */
+    public function getStdError()
+    {
+        return $this->stdErrorLog;
+    }
+
+    /**
+     * Execute Command
+     *
+     * If $callback is set to false then \phpseclib3\Net\SSH2::get_channel_packet(self::CHANNEL_EXEC) will need to be called manually.
+     * In all likelihood, this is not a feature you want to be taking advantage of.
+     *
+     * @param string $command
+     * @return string|bool
+     * @psalm-return ($callback is callable ? bool : string|bool)
+     * @throws \RuntimeException on connection error
+     */
+    public function exec($command, callable $callback = null)
+    {
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+        $this->stdErrorLog = '';
+
+        if (!$this->isAuthenticated()) {
+            return false;
+        }
+
+        //if ($this->isPTYOpen()) {
+        //    throw new \RuntimeException('If you want to run multiple exec()\'s you will need to disable (and re-enable if appropriate) a PTY for each one.');
+        //}
+
+        $this->open_channel(self::CHANNEL_EXEC);
+
+        if ($this->request_pty === true) {
+            $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
+            $packet = Strings::packSSH2(
+                'CNsCsN4s',
+                NET_SSH2_MSG_CHANNEL_REQUEST,
+                $this->server_channels[self::CHANNEL_EXEC],
+                'pty-req',
+                1,
+                $this->term,
+                $this->windowColumns,
+                $this->windowRows,
+                0,
+                0,
+                $terminal_modes
+            );
+
+            $this->send_binary_packet($packet);
+
+            $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST;
+            if (!$this->get_channel_packet(self::CHANNEL_EXEC)) {
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                throw new \RuntimeException('Unable to request pseudo-terminal');
+            }
+        }
+
+        // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things
+        // down.  the one place where it might be desirable is if you're doing something like \phpseclib3\Net\SSH2::exec('ping localhost &').
+        // with a pty-req SSH_MSG_CHANNEL_REQUEST, exec() will return immediately and the ping process will then
+        // then immediately terminate.  without such a request exec() will loop indefinitely.  the ping process won't end but
+        // neither will your script.
+
+        // although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by
+        // SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the
+        // "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA.  RFC4254#section-5.2 corroborates.
+        $packet = Strings::packSSH2(
+            'CNsCs',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[self::CHANNEL_EXEC],
+            'exec',
+            1,
+            $command
+        );
+        $this->send_binary_packet($packet);
+
+        $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        if (!$this->get_channel_packet(self::CHANNEL_EXEC)) {
+            return false;
+        }
+
+        $this->channel_status[self::CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        if ($this->request_pty === true) {
+            $this->channel_id_last_interactive = self::CHANNEL_EXEC;
+            return true;
+        }
+
+        $output = '';
+        while (true) {
+            $temp = $this->get_channel_packet(self::CHANNEL_EXEC);
+            switch (true) {
+                case $temp === true:
+                    return is_callable($callback) ? true : $output;
+                case $temp === false:
+                    return false;
+                default:
+                    if (is_callable($callback)) {
+                        if ($callback($temp) === true) {
+                            $this->close_channel(self::CHANNEL_EXEC);
+                            return true;
+                        }
+                    } else {
+                        $output .= $temp;
+                    }
+            }
+        }
+    }
+
+    /**
+     * How many channels are currently open?
+     *
+     * @return int
+     */
+    public function getOpenChannelCount()
+    {
+        return $this->channelCount;
+    }
+
+    /**
+     * Opens a channel
+     *
+     * @param string $channel
+     * @param bool $skip_extended
+     * @return bool
+     */
+    protected function open_channel($channel, $skip_extended = false)
+    {
+        if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_CLOSE) {
+            throw new \RuntimeException('Please close the channel (' . $channel . ') before trying to open it again');
+        }
+
+        $this->channelCount++;
+
+        if ($this->channelCount > 1 && $this->errorOnMultipleChannels) {
+            throw new \RuntimeException("Ubuntu's OpenSSH from 5.8 to 6.9 doesn't work with multiple channels");
+        }
+
+        // RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to
+        // be adjusted".  0x7FFFFFFF is, at 2GB, the max size.  technically, it should probably be decremented, but,
+        // honestly, if you're transferring more than 2GB, you probably shouldn't be using phpseclib, anyway.
+        // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
+        $this->window_size_server_to_client[$channel] = $this->window_size;
+        // 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy
+        // uses 0x4000, that's what will be used here, as well.
+        $packet_size = 0x4000;
+
+        $packet = Strings::packSSH2(
+            'CsN3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            'session',
+            $channel,
+            $this->window_size_server_to_client[$channel],
+            $packet_size
+        );
+
+        $this->send_binary_packet($packet);
+
+        $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        return $this->get_channel_packet($channel, $skip_extended);
+    }
+
+    /**
+     * Creates an interactive shell
+     *
+     * Returns bool(true) if the shell was opened.
+     * Returns bool(false) if the shell was already open.
+     *
+     * @see self::isShellOpen()
+     * @see self::read()
+     * @see self::write()
+     * @return bool
+     * @throws InsufficientSetupException if not authenticated
+     * @throws \UnexpectedValueException on receipt of unexpected packets
+     * @throws \RuntimeException on other errors
+     */
+    public function openShell()
+    {
+        if (!$this->isAuthenticated()) {
+            throw new InsufficientSetupException('Operation disallowed prior to login()');
+        }
+
+        $this->open_channel(self::CHANNEL_SHELL);
+
+        $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
+        $packet = Strings::packSSH2(
+            'CNsbsN4s',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[self::CHANNEL_SHELL],
+            'pty-req',
+            true, // want reply
+            $this->term,
+            $this->windowColumns,
+            $this->windowRows,
+            0,
+            0,
+            $terminal_modes
+        );
+
+        $this->send_binary_packet($packet);
+
+        $this->channel_status[self::CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        if (!$this->get_channel_packet(self::CHANNEL_SHELL)) {
+            throw new \RuntimeException('Unable to request pty');
+        }
+
+        $packet = Strings::packSSH2(
+            'CNsb',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[self::CHANNEL_SHELL],
+            'shell',
+            true // want reply
+        );
+        $this->send_binary_packet($packet);
+
+        $response = $this->get_channel_packet(self::CHANNEL_SHELL);
+        if ($response === false) {
+            throw new \RuntimeException('Unable to request shell');
+        }
+
+        $this->channel_status[self::CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        $this->channel_id_last_interactive = self::CHANNEL_SHELL;
+
+        $this->bitmap |= self::MASK_SHELL;
+
+        return true;
+    }
+
+    /**
+     * Return the channel to be used with read(), write(), and reset(), if none were specified
+     * @deprecated for lack of transparency in intended channel target, to be potentially replaced
+     *             with method which guarantees open-ness of all yielded channels and throws
+     *             error for multiple open channels
+     * @see self::read()
+     * @see self::write()
+     * @return int
+     */
+    private function get_interactive_channel()
+    {
+        switch (true) {
+            case $this->is_channel_status_data(self::CHANNEL_SUBSYSTEM):
+                return self::CHANNEL_SUBSYSTEM;
+            case $this->is_channel_status_data(self::CHANNEL_EXEC):
+                return self::CHANNEL_EXEC;
+            default:
+                return self::CHANNEL_SHELL;
+        }
+    }
+
+    /**
+     * Indicates the DATA status on the given channel
+     *
+     * @param int $channel The channel number to evaluate
+     * @return bool
+     */
+    private function is_channel_status_data($channel)
+    {
+        return isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA;
+    }
+
+    /**
+     * Return an available open channel
+     *
+     * @return int
+     */
+    private function get_open_channel()
+    {
+        $channel = self::CHANNEL_EXEC;
+        do {
+            if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_OPEN) {
+                return $channel;
+            }
+        } while ($channel++ < self::CHANNEL_SUBSYSTEM);
+
+        return false;
+    }
+
+    /**
+     * Request agent forwarding of remote server
+     *
+     * @return bool
+     */
+    public function requestAgentForwarding()
+    {
+        $request_channel = $this->get_open_channel();
+        if ($request_channel === false) {
+            return false;
+        }
+
+        $packet = Strings::packSSH2(
+            'CNsC',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[$request_channel],
+            'auth-agent-req@openssh.com',
+            1
+        );
+
+        $this->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $this->send_binary_packet($packet);
+
+        if (!$this->get_channel_packet($request_channel)) {
+            return false;
+        }
+
+        $this->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        return true;
+    }
+
+    /**
+     * Returns the output of an interactive shell
+     *
+     * Returns when there's a match for $expect, which can take the form of a string literal or,
+     * if $mode == self::READ_REGEX, a regular expression.
+     *
+     * If not specifying a channel, an open interactive channel will be selected, or, if there are
+     * no open channels, an interactive shell will be created. If there are multiple open
+     * interactive channels, a legacy behavior will apply in which channel selection prioritizes
+     * an active subsystem, the exec pty, and, lastly, the shell. If using multiple interactive
+     * channels, callers are discouraged from relying on this legacy behavior and should specify
+     * the intended channel.
+     *
+     * @see self::write()
+     * @param string $expect
+     * @param int $mode One of the self::READ_* constants
+     * @param int|null $channel Channel id returned by self::getInteractiveChannelId()
+     * @return string|bool|null
+     * @throws \RuntimeException on connection error
+     * @throws InsufficientSetupException on unexpected channel status, possibly due to closure
+     */
+    public function read($expect = '', $mode = self::READ_SIMPLE, $channel = null)
+    {
+        if (!$this->isAuthenticated()) {
+            throw new InsufficientSetupException('Operation disallowed prior to login()');
+        }
+
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+
+        if ($channel === null) {
+            $channel = $this->get_interactive_channel();
+        }
+
+        if (!$this->is_channel_status_data($channel) && empty($this->channel_buffers[$channel])) {
+            if ($channel != self::CHANNEL_SHELL) {
+                throw new InsufficientSetupException('Data is not available on channel');
+            } elseif (!$this->openShell()) {
+                throw new \RuntimeException('Unable to initiate an interactive shell session');
+            }
+        }
+
+        if ($mode == self::READ_NEXT) {
+            return $this->get_channel_packet($channel);
+        }
+
+        $match = $expect;
+        while (true) {
+            if ($mode == self::READ_REGEX) {
+                preg_match($expect, substr($this->interactiveBuffer, -1024), $matches);
+                $match = isset($matches[0]) ? $matches[0] : '';
+            }
+            $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
+            if ($pos !== false) {
+                return Strings::shift($this->interactiveBuffer, $pos + strlen($match));
+            }
+            $response = $this->get_channel_packet($channel);
+            if ($response === true) {
+                return Strings::shift($this->interactiveBuffer, strlen($this->interactiveBuffer));
+            }
+
+            $this->interactiveBuffer .= $response;
+        }
+    }
+
+    /**
+     * Inputs a command into an interactive shell.
+     *
+     * If not specifying a channel, an open interactive channel will be selected, or, if there are
+     * no open channels, an interactive shell will be created. If there are multiple open
+     * interactive channels, a legacy behavior will apply in which channel selection prioritizes
+     * an active subsystem, the exec pty, and, lastly, the shell. If using multiple interactive
+     * channels, callers are discouraged from relying on this legacy behavior and should specify
+     * the intended channel.
+     *
+     * @see SSH2::read()
+     * @param string $cmd
+     * @param int|null $channel Channel id returned by self::getInteractiveChannelId()
+     * @return void
+     * @throws \RuntimeException on connection error
+     * @throws InsufficientSetupException on unexpected channel status, possibly due to closure
+     * @throws TimeoutException if the write could not be completed within the requested self::setTimeout()
+     */
+    public function write($cmd, $channel = null)
+    {
+        if (!$this->isAuthenticated()) {
+            throw new InsufficientSetupException('Operation disallowed prior to login()');
+        }
+
+        if ($channel === null) {
+            $channel = $this->get_interactive_channel();
+        }
+
+        if (!$this->is_channel_status_data($channel)) {
+            if ($channel != self::CHANNEL_SHELL) {
+                throw new InsufficientSetupException('Data is not available on channel');
+            } elseif (!$this->openShell()) {
+                throw new \RuntimeException('Unable to initiate an interactive shell session');
+            }
+        }
+
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+        $this->send_channel_packet($channel, $cmd);
+    }
+
+    /**
+     * Start a subsystem.
+     *
+     * Right now only one subsystem at a time is supported. To support multiple subsystem's stopSubsystem() could accept
+     * a string that contained the name of the subsystem, but at that point, only one subsystem of each type could be opened.
+     * To support multiple subsystem's of the same name maybe it'd be best if startSubsystem() generated a new channel id and
+     * returns that and then that that was passed into stopSubsystem() but that'll be saved for a future date and implemented
+     * if there's sufficient demand for such a feature.
+     *
+     * @see self::stopSubsystem()
+     * @param string $subsystem
+     * @return bool
+     */
+    public function startSubsystem($subsystem)
+    {
+        $this->open_channel(self::CHANNEL_SUBSYSTEM);
+
+        $packet = Strings::packSSH2(
+            'CNsCs',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[self::CHANNEL_SUBSYSTEM],
+            'subsystem',
+            1,
+            $subsystem
+        );
+        $this->send_binary_packet($packet);
+
+        $this->channel_status[self::CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        if (!$this->get_channel_packet(self::CHANNEL_SUBSYSTEM)) {
+            return false;
+        }
+
+        $this->channel_status[self::CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        $this->channel_id_last_interactive = self::CHANNEL_SUBSYSTEM;
+
+        return true;
+    }
+
+    /**
+     * Stops a subsystem.
+     *
+     * @see self::startSubsystem()
+     * @return bool
+     */
+    public function stopSubsystem()
+    {
+        if ($this->isInteractiveChannelOpen(self::CHANNEL_SUBSYSTEM)) {
+            $this->close_channel(self::CHANNEL_SUBSYSTEM);
+        }
+        return true;
+    }
+
+    /**
+     * Closes a channel
+     *
+     * If read() timed out you might want to just close the channel and have it auto-restart on the next read() call
+     *
+     * If not specifying a channel, an open interactive channel will be selected. If there are
+     * multiple open interactive channels, a legacy behavior will apply in which channel selection
+     * prioritizes an active subsystem, the exec pty, and, lastly, the shell. If using multiple
+     * interactive channels, callers are discouraged from relying on this legacy behavior and
+     * should specify the intended channel.
+     *
+     * @param int|null $channel Channel id returned by self::getInteractiveChannelId()
+     * @return void
+     */
+    public function reset($channel = null)
+    {
+        if ($channel === null) {
+            $channel = $this->get_interactive_channel();
+        }
+        if ($this->isInteractiveChannelOpen($channel)) {
+            $this->close_channel($channel);
+        }
+    }
+
+    /**
+     * Is timeout?
+     *
+     * Did exec() or read() return because they timed out or because they encountered the end?
+     *
+     */
+    public function isTimeout()
+    {
+        return $this->is_timeout;
+    }
+
+    /**
+     * Disconnect
+     *
+     */
+    public function disconnect()
+    {
+        $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+        if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) {
+            fclose($this->realtime_log_file);
+        }
+        unset(self::$connections[$this->getResourceId()]);
+    }
+
+    /**
+     * Destructor.
+     *
+     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
+     * disconnect().
+     *
+     */
+    public function __destruct()
+    {
+        $this->disconnect();
+    }
+
+    /**
+     * Is the connection still active?
+     *
+     * $level has 3x possible values:
+     * 0 (default): phpseclib takes a passive approach to see if the connection is still active by calling feof()
+     *    on the socket
+     * 1: phpseclib takes an active approach to see if the connection is still active by sending an SSH_MSG_IGNORE
+     *    packet that doesn't require a response
+     * 2: phpseclib takes an active approach to see if the connection is still active by sending an SSH_MSG_CHANNEL_OPEN
+     *    packet and imediately trying to close that channel. some routers, in particular, however, will only let you
+     *    open one channel, so this approach could yield false positives
+     *
+     * @param int $level
+     * @return bool
+     */
+    public function isConnected($level = 0)
+    {
+        if (!is_int($level) || $level < 0 || $level > 2) {
+            throw new \InvalidArgumentException('$level must be 0, 1 or 2');
+        }
+
+        if ($level == 0) {
+            return ($this->bitmap & self::MASK_CONNECTED) && is_resource($this->fsock) && !feof($this->fsock);
+        }
+        try {
+            if ($level == 1) {
+                $this->send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
+            } else {
+                $this->open_channel(self::CHANNEL_KEEP_ALIVE);
+                $this->close_channel(self::CHANNEL_KEEP_ALIVE);
+            }
+            return true;
+        } catch (\Exception $e) {
+            return false;
+        }
+    }
+
+    /**
+     * Have you successfully been logged in?
+     *
+     * @return bool
+     */
+    public function isAuthenticated()
+    {
+        return (bool) ($this->bitmap & self::MASK_LOGIN);
+    }
+
+    /**
+     * Is the interactive shell active?
+     *
+     * @return bool
+     */
+    public function isShellOpen()
+    {
+        return $this->isInteractiveChannelOpen(self::CHANNEL_SHELL);
+    }
+
+    /**
+     * Is the exec pty active?
+     *
+     * @return bool
+     */
+    public function isPTYOpen()
+    {
+        return $this->isInteractiveChannelOpen(self::CHANNEL_EXEC);
+    }
+
+    /**
+     * Is the given interactive channel active?
+     *
+     * @param int $channel Channel id returned by self::getInteractiveChannelId()
+     * @return bool
+     */
+    public function isInteractiveChannelOpen($channel)
+    {
+        return $this->isAuthenticated() && $this->is_channel_status_data($channel);
+    }
+
+    /**
+     * Returns a channel identifier, presently of the last interactive channel opened, regardless of current status.
+     * Returns 0 if no interactive channel has been opened.
+     *
+     * @see self::isInteractiveChannelOpen()
+     * @return int
+     */
+    public function getInteractiveChannelId()
+    {
+        return $this->channel_id_last_interactive;
+    }
+
+    /**
+     * Pings a server connection, or tries to reconnect if the connection has gone down
+     *
+     * Inspired by http://php.net/manual/en/mysqli.ping.php
+     *
+     * @return bool
+     */
+    public function ping()
+    {
+        if (!$this->isAuthenticated()) {
+            if (!empty($this->auth)) {
+                return $this->reconnect();
+            }
+            return false;
+        }
+
+        try {
+            $this->open_channel(self::CHANNEL_KEEP_ALIVE);
+        } catch (\RuntimeException $e) {
+            return $this->reconnect();
+        }
+
+        $this->close_channel(self::CHANNEL_KEEP_ALIVE);
+        return true;
+    }
+
+    /**
+     * In situ reconnect method
+     *
+     * @return boolean
+     */
+    private function reconnect()
+    {
+        $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+        $this->connect();
+        foreach ($this->auth as $auth) {
+            $result = $this->login(...$auth);
+        }
+        return $result;
+    }
+
+    /**
+     * Resets a connection for re-use
+     */
+    protected function reset_connection()
+    {
+        if (is_resource($this->fsock) && get_resource_type($this->fsock) === 'stream') {
+            fclose($this->fsock);
+        }
+        $this->fsock = null;
+        $this->bitmap = 0;
+        $this->binary_packet_buffer = null;
+        $this->decrypt = $this->encrypt = false;
+        $this->decrypt_block_size = $this->encrypt_block_size = 8;
+        $this->hmac_check = $this->hmac_create = false;
+        $this->hmac_size = false;
+        $this->session_id = false;
+        $this->last_packet = null;
+        $this->get_seq_no = $this->send_seq_no = 0;
+        $this->channel_status = [];
+        $this->channel_id_last_interactive = 0;
+        $this->channel_buffers = [];
+        $this->channel_buffers_write = [];
+    }
+
+    /**
+     * @return int[] second and microsecond stream timeout options based on user-requested timeout and keep-alive, or the default socket timeout by default, which mirrors PHP socket streams.
+     */
+    private function get_stream_timeout()
+    {
+        $sec = ini_get('default_socket_timeout');
+        $usec = 0;
+        if ($this->curTimeout > 0) {
+            $sec = (int) floor($this->curTimeout);
+            $usec = (int) (1000000 * ($this->curTimeout - $sec));
+        }
+        if ($this->keepAlive > 0) {
+            $elapsed = microtime(true) - $this->last_packet;
+            $timeout = max($this->keepAlive - $elapsed, 0);
+            if (!$this->curTimeout || $timeout < $this->curTimeout) {
+                $sec = (int) floor($timeout);
+                $usec = (int) (1000000 * ($timeout - $sec));
+            }
+        }
+        return [$sec, $usec];
+    }
+
+    /**
+     * Retrieves the next packet with added timeout and type handling
+     *
+     * @param string $message_types Message types to enforce in response, closing if not met
+     * @return string
+     * @throws ConnectionClosedException If an error has occurred preventing read of the next packet
+     */
+    private function get_binary_packet_or_close(...$message_types)
+    {
+        try {
+            $packet = $this->get_binary_packet();
+            if (count($message_types) > 0 && !in_array(ord($packet[0]), $message_types)) {
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_PROTOCOL_ERROR);
+                throw new ConnectionClosedException('Bad message type. Expected: #'
+                    . implode(', #', $message_types) . '. Got: #' . ord($packet[0]));
+            }
+            return $packet;
+        } catch (TimeoutException $e) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+            throw new ConnectionClosedException('Connection closed due to timeout');
+        }
+    }
+
+    /**
+     * Gets Binary Packets
+     *
+     * See '6. Binary Packet Protocol' of rfc4253 for more info.
+     *
+     * @see self::_send_binary_packet()
+     * @return string
+     * @throws TimeoutException If user requested timeout was reached while waiting for next packet
+     * @throws ConnectionClosedException If an error has occurred preventing read of the next packet
+     */
+    private function get_binary_packet()
+    {
+        if (!is_resource($this->fsock)) {
+            throw new \InvalidArgumentException('fsock is not a resource.');
+        }
+        if ($this->binary_packet_buffer == null) {
+            // buffer the packet to permit continued reads across timeouts
+            $this->binary_packet_buffer = (object) [
+                'read_time' => 0, // the time to read the packet from the socket
+                'raw' => '', // the raw payload read from the socket
+                'plain' => '', // the packet in plain text, excluding packet_length header
+                'packet_length' => null, // the packet_length value pulled from the payload
+                'size' => $this->decrypt_block_size, // the total size of this packet to be read from the socket
+                                                     // initialize to read single block until packet_length is available
+            ];
+        }
+        $packet = $this->binary_packet_buffer;
+        while (strlen($packet->raw) < $packet->size) {
+            if (feof($this->fsock)) {
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_CONNECTION_LOST);
+                throw new ConnectionClosedException('Connection closed by server');
+            }
+            if ($this->curTimeout < 0) {
+                $this->is_timeout = true;
+                throw new TimeoutException('Timed out waiting for server');
+            }
+            $this->send_keep_alive();
+
+            list($sec, $usec) = $this->get_stream_timeout();
+            stream_set_timeout($this->fsock, $sec, $usec);
+            $start = microtime(true);
+            $raw = stream_get_contents($this->fsock, $packet->size - strlen($packet->raw));
+            $elapsed = microtime(true) - $start;
+            $packet->read_time += $elapsed;
+            if ($this->curTimeout > 0) {
+                $this->curTimeout -= $elapsed;
+            }
+            if ($raw === false) {
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_CONNECTION_LOST);
+                throw new ConnectionClosedException('Connection closed by server');
+            } elseif (!strlen($raw)) {
+                continue;
+            }
+            $packet->raw .= $raw;
+            if (!$packet->packet_length) {
+                $this->get_binary_packet_size($packet);
+            }
+        }
+
+        if (strlen($packet->raw) != $packet->size) {
+            throw new \RuntimeException('Size of packet was not expected length');
+        }
+        // destroy buffer as packet represents the entire payload and should be processed in full
+        $this->binary_packet_buffer = null;
+        // copy the raw payload, so as not to destroy original
+        $raw = $packet->raw;
+        if ($this->hmac_check instanceof Hash) {
+            $hmac = Strings::pop($raw, $this->hmac_size);
+        }
+        $packet_length_header_size = 4;
+        if ($this->decrypt) {
+            switch ($this->decryptName) {
+                case 'aes128-gcm@openssh.com':
+                case 'aes256-gcm@openssh.com':
+                    $this->decrypt->setNonce(
+                        $this->decryptFixedPart .
+                        $this->decryptInvocationCounter
+                    );
+                    Strings::increment_str($this->decryptInvocationCounter);
+                    $this->decrypt->setAAD(Strings::shift($raw, $packet_length_header_size));
+                    $this->decrypt->setTag(Strings::pop($raw, $this->decrypt_block_size));
+                    $packet->plain = $this->decrypt->decrypt($raw);
+                    break;
+                case 'chacha20-poly1305@openssh.com':
+                    // This should be impossible, but we are checking anyway to narrow the type for Psalm.
+                    if (!($this->decrypt instanceof ChaCha20)) {
+                        throw new \LogicException('$this->decrypt is not a ' . ChaCha20::class);
+                    }
+                    $this->decrypt->setNonce(pack('N2', 0, $this->get_seq_no));
+                    $this->decrypt->setCounter(0);
+                    // this is the same approach that's implemented in Salsa20::createPoly1305Key()
+                    // but we don't want to use the same AEAD construction that RFC8439 describes
+                    // for ChaCha20-Poly1305 so we won't rely on it (see Salsa20::poly1305())
+                    $this->decrypt->setPoly1305Key(
+                        $this->decrypt->encrypt(str_repeat("\0", 32))
+                    );
+                    $this->decrypt->setAAD(Strings::shift($raw, $packet_length_header_size));
+                    $this->decrypt->setCounter(1);
+                    $this->decrypt->setTag(Strings::pop($raw, 16));
+                    $packet->plain = $this->decrypt->decrypt($raw);
+                    break;
+                default:
+                    if (!$this->hmac_check instanceof Hash || !$this->hmac_check_etm) {
+                        // first block was already decrypted for contained packet_length header
+                        Strings::shift($raw, $this->decrypt_block_size);
+                        if (strlen($raw) > 0) {
+                            $packet->plain .= $this->decrypt->decrypt($raw);
+                        }
+                    } else {
+                        Strings::shift($raw, $packet_length_header_size);
+                        $packet->plain = $this->decrypt->decrypt($raw);
+                    }
+                    break;
+            }
+        } else {
+            Strings::shift($raw, $packet_length_header_size);
+            $packet->plain = $raw;
+        }
+        if ($this->hmac_check instanceof Hash) {
+            $reconstructed = !$this->hmac_check_etm ?
+                pack('Na*', $packet->packet_length, $packet->plain) :
+                substr($packet->raw, 0, -$this->hmac_size);
+            if (($this->hmac_check->getHash() & "\xFF\xFF\xFF\xFF") == 'umac') {
+                $this->hmac_check->setNonce("\0\0\0\0" . pack('N', $this->get_seq_no));
+                if ($hmac != $this->hmac_check->hash($reconstructed)) {
+                    $this->disconnect_helper(NET_SSH2_DISCONNECT_MAC_ERROR);
+                    throw new ConnectionClosedException('Invalid UMAC');
+                }
+            } else {
+                if ($hmac != $this->hmac_check->hash(pack('Na*', $this->get_seq_no, $reconstructed))) {
+                    $this->disconnect_helper(NET_SSH2_DISCONNECT_MAC_ERROR);
+                    throw new ConnectionClosedException('Invalid HMAC');
+                }
+            }
+        }
+        $padding_length = 0;
+        $payload = $packet->plain;
+        extract(unpack('Cpadding_length', Strings::shift($payload, 1)));
+        if ($padding_length > 0) {
+            Strings::pop($payload, $padding_length);
+        }
+        if (empty($payload)) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_PROTOCOL_ERROR);
+            throw new ConnectionClosedException('Plaintext is too short');
+        }
+
+        switch ($this->decompress) {
+            case self::NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH:
+                if (!$this->isAuthenticated()) {
+                    break;
+                }
+                // fall-through
+            case self::NET_SSH2_COMPRESSION_ZLIB:
+                if ($this->regenerate_decompression_context) {
+                    $this->regenerate_decompression_context = false;
+
+                    $cmf = ord($payload[0]);
+                    $cm = $cmf & 0x0F;
+                    if ($cm != 8) { // deflate
+                        user_error("Only CM = 8 ('deflate') is supported ($cm)");
+                    }
+                    $cinfo = ($cmf & 0xF0) >> 4;
+                    if ($cinfo > 7) {
+                        user_error("CINFO above 7 is not allowed ($cinfo)");
+                    }
+                    $windowSize = 1 << ($cinfo + 8);
+
+                    $flg = ord($payload[1]);
+                    //$fcheck = $flg && 0x0F;
+                    if ((($cmf << 8) | $flg) % 31) {
+                        user_error('fcheck failed');
+                    }
+                    $fdict = boolval($flg & 0x20);
+                    $flevel = ($flg & 0xC0) >> 6;
+
+                    $this->decompress_context = inflate_init(ZLIB_ENCODING_RAW, ['window' => $cinfo + 8]);
+                    $payload = substr($payload, 2);
+                }
+                if ($this->decompress_context) {
+                    $payload = inflate_add($this->decompress_context, $payload, ZLIB_PARTIAL_FLUSH);
+                }
+        }
+
+        $this->get_seq_no++;
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $current = microtime(true);
+            $message_number = isset(self::$message_numbers[ord($payload[0])]) ? self::$message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')';
+            $message_number = '<- ' . $message_number .
+                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($packet->read_time, 4) . 's)';
+            $this->append_log($message_number, $payload);
+        }
+        $this->last_packet = microtime(true);
+
+        return $this->filter($payload);
+    }
+
+    /**
+     * @param object $packet The packet object being constructed, passed by reference
+     *        The size, packet_length, and plain properties of this object may be modified in processing
+     * @throws InvalidPacketLengthException if the packet length header is invalid
+     */
+    private function get_binary_packet_size(&$packet)
+    {
+        $packet_length_header_size = 4;
+        if (strlen($packet->raw) < $packet_length_header_size) {
+            return;
+        }
+        $packet_length = 0;
+        $added_validation_length = 0; // indicates when the packet length header is included when validating packet length against block size
+        if ($this->decrypt) {
+            switch ($this->decryptName) {
+                case 'aes128-gcm@openssh.com':
+                case 'aes256-gcm@openssh.com':
+                    extract(unpack('Npacket_length', substr($packet->raw, 0, $packet_length_header_size)));
+                    $packet->size = $packet_length_header_size + $packet_length + $this->decrypt_block_size; // expect tag
+                    break;
+                case 'chacha20-poly1305@openssh.com':
+                    $this->lengthDecrypt->setNonce(pack('N2', 0, $this->get_seq_no));
+                    $packet_length_header = $this->lengthDecrypt->decrypt(substr($packet->raw, 0, $packet_length_header_size));
+                    extract(unpack('Npacket_length', $packet_length_header));
+                    $packet->size = $packet_length_header_size + $packet_length + 16; // expect tag
+                    break;
+                default:
+                    if (!$this->hmac_check instanceof Hash || !$this->hmac_check_etm) {
+                        if (strlen($packet->raw) < $this->decrypt_block_size) {
+                            return;
+                        }
+                        $packet->plain = $this->decrypt->decrypt(substr($packet->raw, 0, $this->decrypt_block_size));
+                        extract(unpack('Npacket_length', Strings::shift($packet->plain, $packet_length_header_size)));
+                        $packet->size = $packet_length_header_size + $packet_length;
+                        $added_validation_length = $packet_length_header_size;
+                    } else {
+                        extract(unpack('Npacket_length', substr($packet->raw, 0, $packet_length_header_size)));
+                        $packet->size = $packet_length_header_size + $packet_length;
+                    }
+                    break;
+            }
+        } else {
+            extract(unpack('Npacket_length', substr($packet->raw, 0, $packet_length_header_size)));
+            $packet->size = $packet_length_header_size + $packet_length;
+            $added_validation_length = $packet_length_header_size;
+        }
+        // quoting <http://tools.ietf.org/html/rfc4253#section-6.1>,
+        // "implementations SHOULD check that the packet length is reasonable"
+        // PuTTY uses 0x9000 as the actual max packet size and so to shall we
+        if (
+            $packet_length <= 0 || $packet_length > 0x9000
+            || ($packet_length + $added_validation_length) % $this->decrypt_block_size != 0
+        ) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_PROTOCOL_ERROR);
+            throw new InvalidPacketLengthException('Invalid packet length');
+        }
+        if ($this->hmac_check instanceof Hash) {
+            $packet->size += $this->hmac_size;
+        }
+        $packet->packet_length = $packet_length;
+    }
+
+    /**
+     * Filter Binary Packets
+     *
+     * Because some binary packets need to be ignored...
+     *
+     * @see self::_get_binary_packet()
+     * @param string $payload
+     * @return string
+     */
+    private function filter($payload)
+    {
+        switch (ord($payload[0])) {
+            case NET_SSH2_MSG_DISCONNECT:
+                Strings::shift($payload, 1);
+                list($reason_code, $message) = Strings::unpackSSH2('Ns', $payload);
+                $this->errors[] = 'SSH_MSG_DISCONNECT: ' . self::$disconnect_reasons[$reason_code] . "\r\n$message";
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_CONNECTION_LOST);
+                throw new ConnectionClosedException('Connection closed by server');
+            case NET_SSH2_MSG_IGNORE:
+                $this->extra_packets++;
+                $payload = $this->get_binary_packet();
+                break;
+            case NET_SSH2_MSG_DEBUG:
+                $this->extra_packets++;
+                Strings::shift($payload, 2); // second byte is "always_display"
+                list($message) = Strings::unpackSSH2('s', $payload);
+                $this->errors[] = "SSH_MSG_DEBUG: $message";
+                $payload = $this->get_binary_packet();
+                break;
+            case NET_SSH2_MSG_UNIMPLEMENTED:
+                break; // return payload
+            case NET_SSH2_MSG_KEXINIT:
+                // this is here for key re-exchanges after the initial key exchange
+                if ($this->session_id !== false) {
+                    if (!$this->key_exchange($payload)) {
+                        $this->disconnect_helper(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+                        throw new ConnectionClosedException('Key exchange failed');
+                    }
+                    $payload = $this->get_binary_packet();
+                }
+                break;
+            case NET_SSH2_MSG_EXT_INFO:
+                Strings::shift($payload, 1);
+                list($nr_extensions) = Strings::unpackSSH2('N', $payload);
+                for ($i = 0; $i < $nr_extensions; $i++) {
+                    list($extension_name, $extension_value) = Strings::unpackSSH2('ss', $payload);
+                    if ($extension_name == 'server-sig-algs') {
+                        $this->supported_private_key_algorithms = explode(',', $extension_value);
+                    }
+                }
+                $payload = $this->get_binary_packet();
+        }
+
+        // see http://tools.ietf.org/html/rfc4252#section-5.4; only called when the encryption has been activated and when we haven't already logged in
+        if (($this->bitmap & self::MASK_CONNECTED) && !$this->isAuthenticated() && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) {
+            Strings::shift($payload, 1);
+            list($this->banner_message) = Strings::unpackSSH2('s', $payload);
+            $payload = $this->get_binary_packet();
+        }
+
+        // only called when we've already logged in
+        if (($this->bitmap & self::MASK_CONNECTED) && $this->isAuthenticated()) {
+            switch (ord($payload[0])) {
+                case NET_SSH2_MSG_CHANNEL_REQUEST:
+                    if (strlen($payload) == 31) {
+                        extract(unpack('cpacket_type/Nchannel/Nlength', $payload));
+                        if (substr($payload, 9, $length) == 'keepalive@openssh.com' && isset($this->server_channels[$channel])) {
+                            if (ord(substr($payload, 9 + $length))) { // want reply
+                                $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_SUCCESS, $this->server_channels[$channel]));
+                            }
+                            $payload = $this->get_binary_packet();
+                        }
+                    }
+                    break;
+                case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4
+                    Strings::shift($payload, 1);
+                    list($request_name) = Strings::unpackSSH2('s', $payload);
+                    $this->errors[] = "SSH_MSG_GLOBAL_REQUEST: $request_name";
+                    $this->send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE));
+                    $payload = $this->get_binary_packet();
+                    break;
+                case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1
+                    Strings::shift($payload, 1);
+                    list($data, $server_channel) = Strings::unpackSSH2('sN', $payload);
+                    switch ($data) {
+                        case 'auth-agent':
+                        case 'auth-agent@openssh.com':
+                            if (isset($this->agent)) {
+                                $new_channel = self::CHANNEL_AGENT_FORWARD;
+
+                                list(
+                                    $remote_window_size,
+                                    $remote_maximum_packet_size
+                                ) = Strings::unpackSSH2('NN', $payload);
+
+                                $this->packet_size_client_to_server[$new_channel] = $remote_window_size;
+                                $this->window_size_server_to_client[$new_channel] = $remote_maximum_packet_size;
+                                $this->window_size_client_to_server[$new_channel] = $this->window_size;
+
+                                $packet_size = 0x4000;
+
+                                $packet = pack(
+                                    'CN4',
+                                    NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
+                                    $server_channel,
+                                    $new_channel,
+                                    $packet_size,
+                                    $packet_size
+                                );
+
+                                $this->server_channels[$new_channel] = $server_channel;
+                                $this->channel_status[$new_channel] = NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION;
+                                $this->send_binary_packet($packet);
+                            }
+                            break;
+                        default:
+                            $packet = Strings::packSSH2(
+                                'CN2ss',
+                                NET_SSH2_MSG_CHANNEL_OPEN_FAILURE,
+                                $server_channel,
+                                NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED,
+                                '', // description
+                                '' // language tag
+                            );
+                            $this->send_binary_packet($packet);
+                    }
+
+                    $payload = $this->get_binary_packet();
+                    break;
+            }
+        }
+
+        return $payload;
+    }
+
+    /**
+     * Enable Quiet Mode
+     *
+     * Suppress stderr from output
+     *
+     */
+    public function enableQuietMode()
+    {
+        $this->quiet_mode = true;
+    }
+
+    /**
+     * Disable Quiet Mode
+     *
+     * Show stderr in output
+     *
+     */
+    public function disableQuietMode()
+    {
+        $this->quiet_mode = false;
+    }
+
+    /**
+     * Returns whether Quiet Mode is enabled or not
+     *
+     * @see self::enableQuietMode()
+     * @see self::disableQuietMode()
+     * @return bool
+     */
+    public function isQuietModeEnabled()
+    {
+        return $this->quiet_mode;
+    }
+
+    /**
+     * Enable request-pty when using exec()
+     *
+     */
+    public function enablePTY()
+    {
+        $this->request_pty = true;
+    }
+
+    /**
+     * Disable request-pty when using exec()
+     *
+     */
+    public function disablePTY()
+    {
+        if ($this->isPTYOpen()) {
+            $this->close_channel(self::CHANNEL_EXEC);
+        }
+        $this->request_pty = false;
+    }
+
+    /**
+     * Returns whether request-pty is enabled or not
+     *
+     * @see self::enablePTY()
+     * @see self::disablePTY()
+     * @return bool
+     */
+    public function isPTYEnabled()
+    {
+        return $this->request_pty;
+    }
+
+    /**
+     * Gets channel data
+     *
+     * Returns the data as a string. bool(true) is returned if:
+     *
+     * - the server closes the channel
+     * - if the connection times out
+     * - if a window adjust packet is received on the given negated client channel
+     * - if the channel status is CHANNEL_OPEN and the response was CHANNEL_OPEN_CONFIRMATION
+     * - if the channel status is CHANNEL_REQUEST and the response was CHANNEL_SUCCESS
+     * - if the channel status is CHANNEL_CLOSE and the response was CHANNEL_CLOSE
+     *
+     * bool(false) is returned if:
+     *
+     * - if the channel status is CHANNEL_REQUEST and the response was CHANNEL_FAILURE
+     *
+     * @param int $client_channel Specifies the channel to return data for, and data received
+     *        on other channels is buffered. The respective negative value of a channel is
+     *        also supported for the case that the caller is awaiting adjustment of the data
+     *        window, and where data received on that respective channel is also buffered.
+     * @param bool $skip_extended
+     * @return mixed
+     * @throws \RuntimeException on connection error
+     */
+    protected function get_channel_packet($client_channel, $skip_extended = false)
+    {
+        if (!empty($this->channel_buffers[$client_channel])) {
+            switch ($this->channel_status[$client_channel]) {
+                case NET_SSH2_MSG_CHANNEL_REQUEST:
+                    foreach ($this->channel_buffers[$client_channel] as $i => $packet) {
+                        switch (ord($packet[0])) {
+                            case NET_SSH2_MSG_CHANNEL_SUCCESS:
+                            case NET_SSH2_MSG_CHANNEL_FAILURE:
+                                unset($this->channel_buffers[$client_channel][$i]);
+                                return substr($packet, 1);
+                        }
+                    }
+                    break;
+                default:
+                    return substr(array_shift($this->channel_buffers[$client_channel]), 1);
+            }
+        }
+
+        while (true) {
+            try {
+                $response = $this->get_binary_packet();
+            } catch (TimeoutException $e) {
+                return true;
+            }
+            list($type) = Strings::unpackSSH2('C', $response);
+            if (strlen($response) >= 4) {
+                list($channel) = Strings::unpackSSH2('N', $response);
+            }
+
+            // will not be setup yet on incoming channel open request
+            if (isset($channel) && isset($this->channel_status[$channel]) && isset($this->window_size_server_to_client[$channel])) {
+                $this->window_size_server_to_client[$channel] -= strlen($response);
+
+                // resize the window, if appropriate
+                if ($this->window_size_server_to_client[$channel] < 0) {
+                // PuTTY does something more analogous to the following:
+                //if ($this->window_size_server_to_client[$channel] < 0x3FFFFFFF) {
+                    $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_resize);
+                    $this->send_binary_packet($packet);
+                    $this->window_size_server_to_client[$channel] += $this->window_resize;
+                }
+
+                switch ($type) {
+                    case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST:
+                        list($window_size) = Strings::unpackSSH2('N', $response);
+                        $this->window_size_client_to_server[$channel] += $window_size;
+                        if ($channel == -$client_channel) {
+                            return true;
+                        }
+
+                        continue 2;
+                    case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
+                        /*
+                        if ($client_channel == self::CHANNEL_EXEC) {
+                            $this->send_channel_packet($client_channel, chr(0));
+                        }
+                        */
+                        // currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR
+                        list($data_type_code, $data) = Strings::unpackSSH2('Ns', $response);
+                        $this->stdErrorLog .= $data;
+                        if ($skip_extended || $this->quiet_mode) {
+                            continue 2;
+                        }
+                        if ($client_channel == $channel && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA) {
+                            return $data;
+                        }
+                        $this->channel_buffers[$channel][] = chr($type) . $data;
+
+                        continue 2;
+                    case NET_SSH2_MSG_CHANNEL_REQUEST:
+                        if ($this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_CLOSE) {
+                            continue 2;
+                        }
+                        list($value) = Strings::unpackSSH2('s', $response);
+                        switch ($value) {
+                            case 'exit-signal':
+                                list(
+                                    , // FALSE
+                                    $signal_name,
+                                    , // core dumped
+                                    $error_message
+                                ) = Strings::unpackSSH2('bsbs', $response);
+
+                                $this->errors[] = "SSH_MSG_CHANNEL_REQUEST (exit-signal): $signal_name";
+                                if (strlen($error_message)) {
+                                    $this->errors[count($this->errors) - 1] .= "\r\n$error_message";
+                                }
+
+                                $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
+                                $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
+
+                                $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF;
+
+                                continue 3;
+                            case 'exit-status':
+                                list(, $this->exit_status) = Strings::unpackSSH2('CN', $response);
+
+                                // "The client MAY ignore these messages."
+                                // -- http://tools.ietf.org/html/rfc4254#section-6.10
+
+                                continue 3;
+                            default:
+                                // "Some systems may not implement signals, in which case they SHOULD ignore this message."
+                                //  -- http://tools.ietf.org/html/rfc4254#section-6.9
+                                continue 3;
+                        }
+                }
+
+                switch ($this->channel_status[$channel]) {
+                    case NET_SSH2_MSG_CHANNEL_OPEN:
+                        switch ($type) {
+                            case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
+                                list(
+                                    $this->server_channels[$channel],
+                                    $window_size,
+                                    $this->packet_size_client_to_server[$channel]
+                                ) = Strings::unpackSSH2('NNN', $response);
+
+                                if ($window_size < 0) {
+                                    $window_size &= 0x7FFFFFFF;
+                                    $window_size += 0x80000000;
+                                }
+                                $this->window_size_client_to_server[$channel] = $window_size;
+                                $result = $client_channel == $channel ? true : $this->get_channel_packet($client_channel, $skip_extended);
+                                $this->on_channel_open();
+                                return $result;
+                            case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE:
+                                $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                                throw new \RuntimeException('Unable to open channel');
+                            default:
+                                if ($client_channel == $channel) {
+                                    $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                                    throw new \RuntimeException('Unexpected response to open request');
+                                }
+                                return $this->get_channel_packet($client_channel, $skip_extended);
+                        }
+                        break;
+                    case NET_SSH2_MSG_CHANNEL_REQUEST:
+                        switch ($type) {
+                            case NET_SSH2_MSG_CHANNEL_SUCCESS:
+                                return true;
+                            case NET_SSH2_MSG_CHANNEL_FAILURE:
+                                return false;
+                            case NET_SSH2_MSG_CHANNEL_DATA:
+                                list($data) = Strings::unpackSSH2('s', $response);
+                                $this->channel_buffers[$channel][] = chr($type) . $data;
+                                return $this->get_channel_packet($client_channel, $skip_extended);
+                            default:
+                                $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                                throw new \RuntimeException('Unable to fulfill channel request');
+                        }
+                    case NET_SSH2_MSG_CHANNEL_CLOSE:
+                        if ($client_channel == $channel && $type == NET_SSH2_MSG_CHANNEL_CLOSE) {
+                            return true;
+                        }
+                        return $this->get_channel_packet($client_channel, $skip_extended);
+                }
+            }
+
+            // ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA
+
+            switch ($type) {
+                case NET_SSH2_MSG_CHANNEL_DATA:
+                    /*
+                    if ($channel == self::CHANNEL_EXEC) {
+                        // SCP requires null packets, such as this, be sent.  further, in the case of the ssh.com SSH server
+                        // this actually seems to make things twice as fast.  more to the point, the message right after
+                        // SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise.
+                        // in OpenSSH it slows things down but only by a couple thousandths of a second.
+                        $this->send_channel_packet($channel, chr(0));
+                    }
+                    */
+                    list($data) = Strings::unpackSSH2('s', $response);
+
+                    if ($channel == self::CHANNEL_AGENT_FORWARD) {
+                        $agent_response = $this->agent->forwardData($data);
+                        if (!is_bool($agent_response)) {
+                            $this->send_channel_packet($channel, $agent_response);
+                        }
+                        break;
+                    }
+
+                    if ($client_channel == $channel) {
+                        return $data;
+                    }
+                    $this->channel_buffers[$channel][] = chr($type) . $data;
+                    break;
+                case NET_SSH2_MSG_CHANNEL_CLOSE:
+                    $this->curTimeout = 5;
+
+                    $this->close_channel_bitmap($channel);
+
+                    if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) {
+                        $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
+                    }
+
+                    $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
+                    $this->channelCount--;
+
+                    if ($client_channel == $channel) {
+                        return true;
+                    }
+                    // fall-through
+                case NET_SSH2_MSG_CHANNEL_EOF:
+                    break;
+                default:
+                    $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                    throw new \RuntimeException("Error reading channel data ($type)");
+            }
+        }
+    }
+
+    /**
+     * Sends Binary Packets
+     *
+     * See '6. Binary Packet Protocol' of rfc4253 for more info.
+     *
+     * @param string $data
+     * @param string $logged
+     * @see self::_get_binary_packet()
+     * @return void
+     */
+    protected function send_binary_packet($data, $logged = null)
+    {
+        if (!is_resource($this->fsock) || feof($this->fsock)) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_CONNECTION_LOST);
+            throw new ConnectionClosedException('Connection closed prematurely');
+        }
+
+        if (!isset($logged)) {
+            $logged = $data;
+        }
+
+        switch ($this->compress) {
+            case self::NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH:
+                if (!$this->isAuthenticated()) {
+                    break;
+                }
+                // fall-through
+            case self::NET_SSH2_COMPRESSION_ZLIB:
+                if (!$this->regenerate_compression_context) {
+                    $header = '';
+                } else {
+                    $this->regenerate_compression_context = false;
+                    $this->compress_context = deflate_init(ZLIB_ENCODING_RAW, ['window' => 15]);
+                    $header = "\x78\x9C";
+                }
+                if ($this->compress_context) {
+                    $data = $header . deflate_add($this->compress_context, $data, ZLIB_PARTIAL_FLUSH);
+                }
+        }
+
+        // 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9
+        $packet_length = strlen($data) + 9;
+        if ($this->encrypt && $this->encrypt->usesNonce()) {
+            $packet_length -= 4;
+        }
+        // round up to the nearest $this->encrypt_block_size
+        $packet_length += (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size;
+        // subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length
+        $padding_length = $packet_length - strlen($data) - 5;
+        switch (true) {
+            case $this->encrypt && $this->encrypt->usesNonce():
+            case $this->hmac_create instanceof Hash && $this->hmac_create_etm:
+                $padding_length += 4;
+                $packet_length += 4;
+        }
+
+        $padding = Random::string($padding_length);
+
+        // we subtract 4 from packet_length because the packet_length field isn't supposed to include itself
+        $packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding);
+
+        $hmac = '';
+        if ($this->hmac_create instanceof Hash && !$this->hmac_create_etm) {
+            if (($this->hmac_create->getHash() & "\xFF\xFF\xFF\xFF") == 'umac') {
+                $this->hmac_create->setNonce("\0\0\0\0" . pack('N', $this->send_seq_no));
+                $hmac = $this->hmac_create->hash($packet);
+            } else {
+                $hmac = $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet));
+            }
+        }
+
+        if ($this->encrypt) {
+            switch ($this->encryptName) {
+                case 'aes128-gcm@openssh.com':
+                case 'aes256-gcm@openssh.com':
+                    $this->encrypt->setNonce(
+                        $this->encryptFixedPart .
+                        $this->encryptInvocationCounter
+                    );
+                    Strings::increment_str($this->encryptInvocationCounter);
+                    $this->encrypt->setAAD($temp = ($packet & "\xFF\xFF\xFF\xFF"));
+                    $packet = $temp . $this->encrypt->encrypt(substr($packet, 4));
+                    break;
+                case 'chacha20-poly1305@openssh.com':
+                    // This should be impossible, but we are checking anyway to narrow the type for Psalm.
+                    if (!($this->encrypt instanceof ChaCha20)) {
+                        throw new \LogicException('$this->encrypt is not a ' . ChaCha20::class);
+                    }
+
+                    $nonce = pack('N2', 0, $this->send_seq_no);
+
+                    $this->encrypt->setNonce($nonce);
+                    $this->lengthEncrypt->setNonce($nonce);
+
+                    $length = $this->lengthEncrypt->encrypt($packet & "\xFF\xFF\xFF\xFF");
+
+                    $this->encrypt->setCounter(0);
+                    // this is the same approach that's implemented in Salsa20::createPoly1305Key()
+                    // but we don't want to use the same AEAD construction that RFC8439 describes
+                    // for ChaCha20-Poly1305 so we won't rely on it (see Salsa20::poly1305())
+                    $this->encrypt->setPoly1305Key(
+                        $this->encrypt->encrypt(str_repeat("\0", 32))
+                    );
+                    $this->encrypt->setAAD($length);
+                    $this->encrypt->setCounter(1);
+                    $packet = $length . $this->encrypt->encrypt(substr($packet, 4));
+                    break;
+                default:
+                    $packet = $this->hmac_create instanceof Hash && $this->hmac_create_etm ?
+                        ($packet & "\xFF\xFF\xFF\xFF") . $this->encrypt->encrypt(substr($packet, 4)) :
+                        $this->encrypt->encrypt($packet);
+            }
+        }
+
+        if ($this->hmac_create instanceof Hash && $this->hmac_create_etm) {
+            if (($this->hmac_create->getHash() & "\xFF\xFF\xFF\xFF") == 'umac') {
+                $this->hmac_create->setNonce("\0\0\0\0" . pack('N', $this->send_seq_no));
+                $hmac = $this->hmac_create->hash($packet);
+            } else {
+                $hmac = $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet));
+            }
+        }
+
+        $this->send_seq_no++;
+
+        $packet .= $this->encrypt && $this->encrypt->usesNonce() ? $this->encrypt->getTag() : $hmac;
+
+        $start = microtime(true);
+        $sent = @fputs($this->fsock, $packet);
+        $stop = microtime(true);
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $current = microtime(true);
+            $message_number = isset(self::$message_numbers[ord($logged[0])]) ? self::$message_numbers[ord($logged[0])] : 'UNKNOWN (' . ord($logged[0]) . ')';
+            $message_number = '-> ' . $message_number .
+                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
+            $this->append_log($message_number, $logged);
+        }
+        $this->last_packet = microtime(true);
+
+        if (strlen($packet) != $sent) {
+            $this->disconnect_helper(NET_SSH2_DISCONNECT_BY_APPLICATION);
+            $message = $sent === false ?
+                'Unable to write ' . strlen($packet) . ' bytes' :
+                "Only $sent of " . strlen($packet) . " bytes were sent";
+            throw new \RuntimeException($message);
+        }
+    }
+
+    /**
+     * Sends a keep-alive message, if keep-alive is enabled and interval is met
+     */
+    private function send_keep_alive()
+    {
+        if ($this->bitmap & self::MASK_CONNECTED) {
+            $elapsed = microtime(true) - $this->last_packet;
+            if ($this->keepAlive > 0 && $elapsed >= $this->keepAlive) {
+                $this->send_binary_packet(pack('CN', NET_SSH2_MSG_IGNORE, 0));
+            }
+        }
+    }
+
+    /**
+     * Logs data packets
+     *
+     * Makes sure that only the last 1MB worth of packets will be logged
+     *
+     * @param string $message_number
+     * @param string $message
+     */
+    private function append_log($message_number, $message)
+    {
+        $this->append_log_helper(
+            NET_SSH2_LOGGING,
+            $message_number,
+            $message,
+            $this->message_number_log,
+            $this->message_log,
+            $this->log_size,
+            $this->realtime_log_file,
+            $this->realtime_log_wrap,
+            $this->realtime_log_size
+        );
+    }
+
+    /**
+     * Logs data packet helper
+     *
+     * @param int $constant
+     * @param string $message_number
+     * @param string $message
+     * @param array &$message_number_log
+     * @param array &$message_log
+     * @param int &$log_size
+     * @param resource &$realtime_log_file
+     * @param bool &$realtime_log_wrap
+     * @param int &$realtime_log_size
+     */
+    protected function append_log_helper($constant, $message_number, $message, array &$message_number_log, array &$message_log, &$log_size, &$realtime_log_file, &$realtime_log_wrap, &$realtime_log_size)
+    {
+        // remove the byte identifying the message type from all but the first two messages (ie. the identification strings)
+        if (strlen($message_number) > 2) {
+            Strings::shift($message);
+        }
+
+        switch ($constant) {
+            // useful for benchmarks
+            case self::LOG_SIMPLE:
+                $message_number_log[] = $message_number;
+                break;
+            case self::LOG_SIMPLE_REALTIME:
+                echo $message_number;
+                echo PHP_SAPI == 'cli' ? "\r\n" : '<br>';
+                @flush();
+                @ob_flush();
+                break;
+            // the most useful log for SSH2
+            case self::LOG_COMPLEX:
+                $message_number_log[] = $message_number;
+                $log_size += strlen($message);
+                $message_log[] = $message;
+                while ($log_size > self::LOG_MAX_SIZE) {
+                    $log_size -= strlen(array_shift($message_log));
+                    array_shift($message_number_log);
+                }
+                break;
+            // dump the output out realtime; packets may be interspersed with non packets,
+            // passwords won't be filtered out and select other packets may not be correctly
+            // identified
+            case self::LOG_REALTIME:
+                switch (PHP_SAPI) {
+                    case 'cli':
+                        $start = $stop = "\r\n";
+                        break;
+                    default:
+                        $start = '<pre>';
+                        $stop = '</pre>';
+                }
+                echo $start . $this->format_log([$message], [$message_number]) . $stop;
+                @flush();
+                @ob_flush();
+                break;
+            // basically the same thing as self::LOG_REALTIME with the caveat that NET_SSH2_LOG_REALTIME_FILENAME
+            // needs to be defined and that the resultant log file will be capped out at self::LOG_MAX_SIZE.
+            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
+            // at the beginning of the file
+            case self::LOG_REALTIME_FILE:
+                if (!isset($realtime_log_file)) {
+                    // PHP doesn't seem to like using constants in fopen()
+                    $filename = NET_SSH2_LOG_REALTIME_FILENAME;
+                    $fp = fopen($filename, 'w');
+                    $realtime_log_file = $fp;
+                }
+                if (!is_resource($realtime_log_file)) {
+                    break;
+                }
+                $entry = $this->format_log([$message], [$message_number]);
+                if ($realtime_log_wrap) {
+                    $temp = "<<< START >>>\r\n";
+                    $entry .= $temp;
+                    fseek($realtime_log_file, ftell($realtime_log_file) - strlen($temp));
+                }
+                $realtime_log_size += strlen($entry);
+                if ($realtime_log_size > self::LOG_MAX_SIZE) {
+                    fseek($realtime_log_file, 0);
+                    $realtime_log_size = strlen($entry);
+                    $realtime_log_wrap = true;
+                }
+                fputs($realtime_log_file, $entry);
+        }
+    }
+
+    /**
+     * Sends channel data
+     *
+     * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate
+     *
+     * @param int $client_channel
+     * @param string $data
+     * @return void
+     */
+    protected function send_channel_packet($client_channel, $data)
+    {
+        if (
+            isset($this->channel_buffers_write[$client_channel])
+            && strpos($data, $this->channel_buffers_write[$client_channel]) === 0
+        ) {
+            // if buffer holds identical initial data content, resume send from the unmatched data portion
+            $data = substr($data, strlen($this->channel_buffers_write[$client_channel]));
+        } else {
+            $this->channel_buffers_write[$client_channel] = '';
+        }
+        while (strlen($data)) {
+            if (!$this->window_size_client_to_server[$client_channel]) {
+                // using an invalid channel will let the buffers be built up for the valid channels
+                $this->get_channel_packet(-$client_channel);
+                if ($this->isTimeout()) {
+                    throw new TimeoutException('Timed out waiting for server');
+                } elseif (!$this->window_size_client_to_server[$client_channel]) {
+                    throw new \RuntimeException('Data window was not adjusted');
+                }
+            }
+
+            /* The maximum amount of data allowed is determined by the maximum
+               packet size for the channel, and the current window size, whichever
+               is smaller.
+                 -- http://tools.ietf.org/html/rfc4254#section-5.2 */
+            $max_size = min(
+                $this->packet_size_client_to_server[$client_channel],
+                $this->window_size_client_to_server[$client_channel]
+            );
+
+            $temp = Strings::shift($data, $max_size);
+            $packet = Strings::packSSH2(
+                'CNs',
+                NET_SSH2_MSG_CHANNEL_DATA,
+                $this->server_channels[$client_channel],
+                $temp
+            );
+            $this->window_size_client_to_server[$client_channel] -= strlen($temp);
+            $this->send_binary_packet($packet);
+            $this->channel_buffers_write[$client_channel] .= $temp;
+        }
+        unset($this->channel_buffers_write[$client_channel]);
+    }
+
+    /**
+     * Closes and flushes a channel
+     *
+     * \phpseclib3\Net\SSH2 doesn't properly close most channels.  For exec() channels are normally closed by the server
+     * and for SFTP channels are presumably closed when the client disconnects.  This functions is intended
+     * for SCP more than anything.
+     *
+     * @param int $client_channel
+     * @param bool $want_reply
+     * @return void
+     */
+    private function close_channel($client_channel, $want_reply = false)
+    {
+        // see http://tools.ietf.org/html/rfc4254#section-5.3
+
+        $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
+
+        if (!$want_reply) {
+            $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
+        }
+
+        $this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
+        $this->channelCount--;
+
+        $this->curTimeout = 5;
+
+        while (!is_bool($this->get_channel_packet($client_channel))) {
+        }
+
+        if ($want_reply) {
+            $this->send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
+        }
+
+        $this->close_channel_bitmap($client_channel);
+    }
+
+    /**
+     * Maintains execution state bitmap in response to channel closure
+     *
+     * @param int $client_channel The channel number to maintain closure status of
+     * @return void
+     */
+    private function close_channel_bitmap($client_channel)
+    {
+        switch ($client_channel) {
+            case self::CHANNEL_SHELL:
+                // Shell status has been maintained in the bitmap for backwards
+                //  compatibility sake, but can be removed going forward
+                if ($this->bitmap & self::MASK_SHELL) {
+                    $this->bitmap &= ~self::MASK_SHELL;
+                }
+                break;
+        }
+    }
+
+    /**
+     * Disconnect
+     *
+     * @param int $reason
+     * @return false
+     */
+    protected function disconnect_helper($reason)
+    {
+        if ($this->bitmap & self::MASK_DISCONNECT) {
+            // Disregard subsequent disconnect requests
+            return false;
+        }
+        $this->bitmap |= self::MASK_DISCONNECT;
+        if ($this->isConnected()) {
+            $data = Strings::packSSH2('CNss', NET_SSH2_MSG_DISCONNECT, $reason, '', '');
+            try {
+                $this->send_binary_packet($data);
+            } catch (\Exception $e) {
+            }
+        }
+
+        $this->reset_connection();
+
+        return false;
+    }
+
+    /**
+     * Define Array
+     *
+     * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
+     * named constants from it, using the value as the name of the constant and the index as the value of the constant.
+     * If any of the constants that would be defined already exists, none of the constants will be defined.
+     *
+     * @param mixed[] ...$args
+     * @access protected
+     */
+    protected static function define_array(...$args)
+    {
+        foreach ($args as $arg) {
+            foreach ($arg as $key => $value) {
+                if (!defined($value)) {
+                    define($value, $key);
+                } else {
+                    break 2;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a log of the packets that have been sent and received.
+     *
+     * Returns a string if NET_SSH2_LOGGING == self::LOG_COMPLEX, an array if NET_SSH2_LOGGING == self::LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING')
+     *
+     * @return array|false|string
+     */
+    public function getLog()
+    {
+        if (!defined('NET_SSH2_LOGGING')) {
+            return false;
+        }
+
+        switch (NET_SSH2_LOGGING) {
+            case self::LOG_SIMPLE:
+                return $this->message_number_log;
+            case self::LOG_COMPLEX:
+                $log = $this->format_log($this->message_log, $this->message_number_log);
+                return PHP_SAPI == 'cli' ? $log : '<pre>' . $log . '</pre>';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Formats a log for printing
+     *
+     * @param array $message_log
+     * @param array $message_number_log
+     * @return string
+     */
+    protected function format_log(array $message_log, array $message_number_log)
+    {
+        $output = '';
+        for ($i = 0; $i < count($message_log); $i++) {
+            $output .= $message_number_log[$i];
+            $current_log = $message_log[$i];
+            $j = 0;
+            if (strlen($current_log)) {
+                $output .= "\r\n";
+            }
+            do {
+                if (strlen($current_log)) {
+                    $output .= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
+                }
+                $fragment = Strings::shift($current_log, $this->log_short_width);
+                $hex = substr(preg_replace_callback('#.#s', function ($matches) {
+                    return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
+                }, $fragment), strlen($this->log_boundary));
+                // replace non ASCII printable characters with dots
+                // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
+                // also replace < with a . since < messes up the output on web browsers
+                $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
+                $output .= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
+                $j++;
+            } while (strlen($current_log));
+            $output .= "\r\n";
+        }
+
+        return $output;
+    }
+
+    /**
+     * Helper function for agent->on_channel_open()
+     *
+     * Used when channels are created to inform agent
+     * of said channel opening. Must be called after
+     * channel open confirmation received
+     *
+     */
+    private function on_channel_open()
+    {
+        if (isset($this->agent)) {
+            $this->agent->registerChannelOpen($this);
+        }
+    }
+
+    /**
+     * Returns the first value of the intersection of two arrays or false if
+     * the intersection is empty. The order is defined by the first parameter.
+     *
+     * @param array $array1
+     * @param array $array2
+     * @return mixed False if intersection is empty, else intersected value.
+     */
+    private static function array_intersect_first(array $array1, array $array2)
+    {
+        foreach ($array1 as $value) {
+            if (in_array($value, $array2)) {
+                return $value;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns all errors / debug messages on the SSH layer
+     *
+     * If you are looking for messages from the SFTP layer, please see SFTP::getSFTPErrors()
+     *
+     * @return string[]
+     */
+    public function getErrors()
+    {
+        return $this->errors;
+    }
+
+    /**
+     * Returns the last error received on the SSH layer
+     *
+     * If you are looking for messages from the SFTP layer, please see SFTP::getLastSFTPError()
+     *
+     * @return string
+     */
+    public function getLastError()
+    {
+        $count = count($this->errors);
+
+        if ($count > 0) {
+            return $this->errors[$count - 1];
+        }
+    }
+
+    /**
+     * Return the server identification.
+     *
+     * @return string|false
+     */
+    public function getServerIdentification()
+    {
+        $this->connect();
+
+        return $this->server_identifier;
+    }
+
+    /**
+     * Returns a list of algorithms the server supports
+     *
+     * @return array
+     */
+    public function getServerAlgorithms()
+    {
+        $this->connect();
+
+        return [
+            'kex' => $this->kex_algorithms,
+            'hostkey' => $this->server_host_key_algorithms,
+            'client_to_server' => [
+                'crypt' => $this->encryption_algorithms_client_to_server,
+                'mac' => $this->mac_algorithms_client_to_server,
+                'comp' => $this->compression_algorithms_client_to_server,
+                'lang' => $this->languages_client_to_server
+            ],
+            'server_to_client' => [
+                'crypt' => $this->encryption_algorithms_server_to_client,
+                'mac' => $this->mac_algorithms_server_to_client,
+                'comp' => $this->compression_algorithms_server_to_client,
+                'lang' => $this->languages_server_to_client
+            ]
+        ];
+    }
+
+    /**
+     * Returns a list of KEX algorithms that phpseclib supports
+     *
+     * @return array
+     */
+    public static function getSupportedKEXAlgorithms()
+    {
+        $kex_algorithms = [
+            // Elliptic Curve Diffie-Hellman Key Agreement (ECDH) using
+            // Curve25519. See doc/curve25519-sha256@libssh.org.txt in the
+            // libssh repository for more information.
+            'curve25519-sha256',
+            'curve25519-sha256@libssh.org',
+
+            'ecdh-sha2-nistp256', // RFC 5656
+            'ecdh-sha2-nistp384', // RFC 5656
+            'ecdh-sha2-nistp521', // RFC 5656
+
+            'diffie-hellman-group-exchange-sha256',// RFC 4419
+            'diffie-hellman-group-exchange-sha1',  // RFC 4419
+
+            // Diffie-Hellman Key Agreement (DH) using integer modulo prime
+            // groups.
+            'diffie-hellman-group14-sha256',
+            'diffie-hellman-group14-sha1', // REQUIRED
+            'diffie-hellman-group15-sha512',
+            'diffie-hellman-group16-sha512',
+            'diffie-hellman-group17-sha512',
+            'diffie-hellman-group18-sha512',
+
+            'diffie-hellman-group1-sha1', // REQUIRED
+        ];
+
+        return $kex_algorithms;
+    }
+
+    /**
+     * Returns a list of host key algorithms that phpseclib supports
+     *
+     * @return array
+     */
+    public static function getSupportedHostKeyAlgorithms()
+    {
+        return [
+            'ssh-ed25519', // https://tools.ietf.org/html/draft-ietf-curdle-ssh-ed25519-02
+            'ecdsa-sha2-nistp256', // RFC 5656
+            'ecdsa-sha2-nistp384', // RFC 5656
+            'ecdsa-sha2-nistp521', // RFC 5656
+            'rsa-sha2-256', // RFC 8332
+            'rsa-sha2-512', // RFC 8332
+            'ssh-rsa', // RECOMMENDED  sign   Raw RSA Key
+            'ssh-dss'  // REQUIRED     sign   Raw DSS Key
+        ];
+    }
+
+    /**
+     * Returns a list of symmetric key algorithms that phpseclib supports
+     *
+     * @return array
+     */
+    public static function getSupportedEncryptionAlgorithms()
+    {
+        $algos = [
+            // from <https://tools.ietf.org/html/rfc5647>:
+            'aes128-gcm@openssh.com',
+            'aes256-gcm@openssh.com',
+
+            // from <http://tools.ietf.org/html/rfc4345#section-4>:
+            'arcfour256',
+            'arcfour128',
+
+            //'arcfour',      // OPTIONAL          the ARCFOUR stream cipher with a 128-bit key
+
+            // CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>:
+            'aes128-ctr',     // RECOMMENDED       AES (Rijndael) in SDCTR mode, with 128-bit key
+            'aes192-ctr',     // RECOMMENDED       AES with 192-bit key
+            'aes256-ctr',     // RECOMMENDED       AES with 256-bit key
+
+            // from <https://github.com/openssh/openssh-portable/blob/001aa55/PROTOCOL.chacha20poly1305>:
+            // one of the big benefits of chacha20-poly1305 is speed. the problem is...
+            // libsodium doesn't generate the poly1305 keys in the way ssh does and openssl's PHP bindings don't even
+            // seem to support poly1305 currently. so even if libsodium or openssl are being used for the chacha20
+            // part, pure-PHP has to be used for the poly1305 part and that's gonna cause a big slow down.
+            // speed-wise it winds up being faster to use AES (when openssl or mcrypt are available) and some HMAC
+            // (which is always gonna be super fast to compute thanks to the hash extension, which
+            // "is bundled and compiled into PHP by default")
+            'chacha20-poly1305@openssh.com',
+
+            'twofish128-ctr', // OPTIONAL          Twofish in SDCTR mode, with 128-bit key
+            'twofish192-ctr', // OPTIONAL          Twofish with 192-bit key
+            'twofish256-ctr', // OPTIONAL          Twofish with 256-bit key
+
+            'aes128-cbc',     // RECOMMENDED       AES with a 128-bit key
+            'aes192-cbc',     // OPTIONAL          AES with a 192-bit key
+            'aes256-cbc',     // OPTIONAL          AES in CBC mode, with a 256-bit key
+
+            'twofish128-cbc', // OPTIONAL          Twofish with a 128-bit key
+            'twofish192-cbc', // OPTIONAL          Twofish with a 192-bit key
+            'twofish256-cbc',
+            'twofish-cbc',    // OPTIONAL          alias for "twofish256-cbc"
+                              //                   (this is being retained for historical reasons)
+
+            'blowfish-ctr',   // OPTIONAL          Blowfish in SDCTR mode
+
+            'blowfish-cbc',   // OPTIONAL          Blowfish in CBC mode
+
+            '3des-ctr',       // RECOMMENDED       Three-key 3DES in SDCTR mode
+
+            '3des-cbc',       // REQUIRED          three-key 3DES in CBC mode
+
+             //'none'           // OPTIONAL          no encryption; NOT RECOMMENDED
+        ];
+
+        if (self::$crypto_engine) {
+            $engines = [self::$crypto_engine];
+        } else {
+            $engines = [
+                'libsodium',
+                'OpenSSL (GCM)',
+                'OpenSSL',
+                'mcrypt',
+                'Eval',
+                'PHP'
+            ];
+        }
+
+        $ciphers = [];
+
+        foreach ($engines as $engine) {
+            foreach ($algos as $algo) {
+                $obj = self::encryption_algorithm_to_crypt_instance($algo);
+                if ($obj instanceof Rijndael) {
+                    $obj->setKeyLength(preg_replace('#[^\d]#', '', $algo));
+                }
+                switch ($algo) {
+                    // Eval engines do not exist for ChaCha20 or RC4 because they would not benefit from one.
+                    // to benefit from an Eval engine they'd need to loop a variable amount of times, they'd
+                    // need to do table lookups (eg. sbox subsitutions). ChaCha20 doesn't do either because
+                    // it's a so-called ARX cipher, meaning that the only operations it does are add (A), rotate (R)
+                    // and XOR (X). RC4 does do table lookups but being a stream cipher it works differently than
+                    // block ciphers. with RC4 you XOR the plaintext against a keystream and the keystream changes
+                    // as you encrypt stuff. the only table lookups are made against this keystream and thus table
+                    // lookups are kinda unavoidable. with AES and DES, however, the table lookups that are done
+                    // are done against substitution boxes (sboxes), which are invariant.
+
+                    // OpenSSL can't be used as an engine, either, because OpenSSL doesn't support continuous buffers
+                    // as SSH2 uses and altho you can emulate a continuous buffer with block ciphers you can't do so
+                    // with stream ciphers. As for ChaCha20...  for the ChaCha20 part OpenSSL could prob be used but
+                    // the big slow down isn't with ChaCha20 - it's with Poly1305. SSH constructs the key for that
+                    // differently than how OpenSSL does it (OpenSSL does it as the RFC describes, SSH doesn't).
+
+                    // libsodium can't be used because it doesn't support RC4 and it doesn't construct the Poly1305
+                    // keys in the same way that SSH does
+
+                    // mcrypt could prob be used for RC4 but mcrypt hasn't been included in PHP core for yearss
+                    case 'chacha20-poly1305@openssh.com':
+                    case 'arcfour128':
+                    case 'arcfour256':
+                        if ($engine != 'PHP') {
+                            continue 2;
+                        }
+                        break;
+                    case 'aes128-gcm@openssh.com':
+                    case 'aes256-gcm@openssh.com':
+                        if ($engine == 'OpenSSL') {
+                            continue 2;
+                        }
+                        $obj->setNonce('dummydummydu');
+                }
+                if ($obj->isValidEngine($engine)) {
+                    $algos = array_diff($algos, [$algo]);
+                    $ciphers[] = $algo;
+                }
+            }
+        }
+
+        return $ciphers;
+    }
+
+    /**
+     * Returns a list of MAC algorithms that phpseclib supports
+     *
+     * @return array
+     */
+    public static function getSupportedMACAlgorithms()
+    {
+        return [
+            'hmac-sha2-256-etm@openssh.com',
+            'hmac-sha2-512-etm@openssh.com',
+            'hmac-sha1-etm@openssh.com',
+
+            // from <http://www.ietf.org/rfc/rfc6668.txt>:
+            'hmac-sha2-256',// RECOMMENDED     HMAC-SHA256 (digest length = key length = 32)
+            'hmac-sha2-512',// OPTIONAL        HMAC-SHA512 (digest length = key length = 64)
+
+            'hmac-sha1-96', // RECOMMENDED     first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20)
+            'hmac-sha1',    // REQUIRED        HMAC-SHA1 (digest length = key length = 20)
+            'hmac-md5-96',  // OPTIONAL        first 96 bits of HMAC-MD5 (digest length = 12, key length = 16)
+            'hmac-md5',     // OPTIONAL        HMAC-MD5 (digest length = key length = 16)
+
+            'umac-64-etm@openssh.com',
+            'umac-128-etm@openssh.com',
+
+            // from <https://tools.ietf.org/html/draft-miller-secsh-umac-01>:
+            'umac-64@openssh.com',
+            'umac-128@openssh.com',
+
+            //'none'          // OPTIONAL        no MAC; NOT RECOMMENDED
+        ];
+    }
+
+    /**
+     * Returns a list of compression algorithms that phpseclib supports
+     *
+     * @return array
+     */
+    public static function getSupportedCompressionAlgorithms()
+    {
+        $algos = ['none']; // REQUIRED        no compression
+        if (function_exists('deflate_init')) {
+            $algos[] = 'zlib@openssh.com'; // https://datatracker.ietf.org/doc/html/draft-miller-secsh-compression-delayed
+            $algos[] = 'zlib';
+        }
+        return $algos;
+    }
+
+    /**
+     * Return list of negotiated algorithms
+     *
+     * Uses the same format as https://www.php.net/ssh2-methods-negotiated
+     *
+     * @return array
+     */
+    public function getAlgorithmsNegotiated()
+    {
+        $this->connect();
+
+        $compression_map = [
+            self::NET_SSH2_COMPRESSION_NONE => 'none',
+            self::NET_SSH2_COMPRESSION_ZLIB => 'zlib',
+            self::NET_SSH2_COMPRESSION_ZLIB_AT_OPENSSH => 'zlib@openssh.com'
+        ];
+
+        return [
+            'kex' => $this->kex_algorithm,
+            'hostkey' => $this->signature_format,
+            'client_to_server' => [
+                'crypt' => $this->encryptName,
+                'mac' => $this->hmac_create_name,
+                'comp' => $compression_map[$this->compress],
+            ],
+            'server_to_client' => [
+                'crypt' => $this->decryptName,
+                'mac' => $this->hmac_check_name,
+                'comp' => $compression_map[$this->decompress],
+            ]
+        ];
+    }
+
+    /**
+     * Force multiple channels (even if phpseclib has decided to disable them)
+     */
+    public function forceMultipleChannels()
+    {
+        $this->errorOnMultipleChannels = false;
+    }
+
+    /**
+     * Allows you to set the terminal
+     *
+     * @param string $term
+     */
+    public function setTerminal($term)
+    {
+        $this->term = $term;
+    }
+
+    /**
+     * Accepts an associative array with up to four parameters as described at
+     * <https://www.php.net/manual/en/function.ssh2-connect.php>
+     *
+     * @param array $methods
+     */
+    public function setPreferredAlgorithms(array $methods)
+    {
+        $preferred = $methods;
+
+        if (isset($preferred['kex'])) {
+            $preferred['kex'] = array_intersect(
+                is_string($preferred['kex']) ? [$preferred['kex']] : $preferred['kex'],
+                static::getSupportedKEXAlgorithms()
+            );
+        }
+
+        if (isset($preferred['hostkey'])) {
+            $preferred['hostkey'] = array_intersect(
+                is_string($preferred['hostkey']) ? [$preferred['hostkey']] : $preferred['hostkey'],
+                static::getSupportedHostKeyAlgorithms()
+            );
+        }
+
+        $keys = ['client_to_server', 'server_to_client'];
+        foreach ($keys as $key) {
+            if (isset($preferred[$key])) {
+                $a = &$preferred[$key];
+                if (isset($a['crypt'])) {
+                    $a['crypt'] = array_intersect(
+                        is_string($a['crypt']) ? [$a['crypt']] : $a['crypt'],
+                        static::getSupportedEncryptionAlgorithms()
+                    );
+                }
+                if (isset($a['comp'])) {
+                    $a['comp'] = array_intersect(
+                        is_string($a['comp']) ? [$a['comp']] : $a['comp'],
+                        static::getSupportedCompressionAlgorithms()
+                    );
+                }
+                if (isset($a['mac'])) {
+                    $a['mac'] = array_intersect(
+                        is_string($a['mac']) ? [$a['mac']] : $a['mac'],
+                        static::getSupportedMACAlgorithms()
+                    );
+                }
+            }
+        }
+
+        $keys = [
+            'kex',
+            'hostkey',
+            'client_to_server/crypt',
+            'client_to_server/comp',
+            'client_to_server/mac',
+            'server_to_client/crypt',
+            'server_to_client/comp',
+            'server_to_client/mac',
+        ];
+        foreach ($keys as $key) {
+            $p = $preferred;
+            $m = $methods;
+
+            $subkeys = explode('/', $key);
+            foreach ($subkeys as $subkey) {
+                if (!isset($p[$subkey])) {
+                    continue 2;
+                }
+                $p = $p[$subkey];
+                $m = $m[$subkey];
+            }
+
+            if (count($p) != count($m)) {
+                $diff = array_diff($m, $p);
+                $msg = count($diff) == 1 ?
+                    ' is not a supported algorithm' :
+                    ' are not supported algorithms';
+                throw new UnsupportedAlgorithmException(implode(', ', $diff) . $msg);
+            }
+        }
+
+        $this->preferred = $preferred;
+    }
+
+    /**
+     * Returns the banner message.
+     *
+     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
+     * authentication may be relevant for getting legal protection."
+     *
+     * @return string
+     */
+    public function getBannerMessage()
+    {
+        return $this->banner_message;
+    }
+
+    /**
+     * Returns the server public host key.
+     *
+     * Caching this the first time you connect to a server and checking the result on subsequent connections
+     * is recommended.  Returns false if the server signature is not signed correctly with the public host key.
+     *
+     * @return string|false
+     * @throws \RuntimeException on badly formatted keys
+     * @throws NoSupportedAlgorithmsException when the key isn't in a supported format
+     */
+    public function getServerPublicHostKey()
+    {
+        if (!($this->bitmap & self::MASK_CONSTRUCTOR)) {
+            $this->connect();
+        }
+
+        $signature = $this->signature;
+        $server_public_host_key = base64_encode($this->server_public_host_key);
+
+        if ($this->signature_validated) {
+            return $this->bitmap ?
+                $this->signature_format . ' ' . $server_public_host_key :
+                false;
+        }
+
+        $this->signature_validated = true;
+
+        switch ($this->signature_format) {
+            case 'ssh-ed25519':
+            case 'ecdsa-sha2-nistp256':
+            case 'ecdsa-sha2-nistp384':
+            case 'ecdsa-sha2-nistp521':
+                $key = EC::loadFormat('OpenSSH', $server_public_host_key)
+                    ->withSignatureFormat('SSH2');
+                switch ($this->signature_format) {
+                    case 'ssh-ed25519':
+                        $hash = 'sha512';
+                        break;
+                    case 'ecdsa-sha2-nistp256':
+                        $hash = 'sha256';
+                        break;
+                    case 'ecdsa-sha2-nistp384':
+                        $hash = 'sha384';
+                        break;
+                    case 'ecdsa-sha2-nistp521':
+                        $hash = 'sha512';
+                }
+                $key = $key->withHash($hash);
+                break;
+            case 'ssh-dss':
+                $key = DSA::loadFormat('OpenSSH', $server_public_host_key)
+                    ->withSignatureFormat('SSH2')
+                    ->withHash('sha1');
+                break;
+            case 'ssh-rsa':
+            case 'rsa-sha2-256':
+            case 'rsa-sha2-512':
+                // could be ssh-rsa, rsa-sha2-256, rsa-sha2-512
+                // we don't check here because we already checked in key_exchange
+                // some signatures have the type embedded within the message and some don't
+                list(, $signature) = Strings::unpackSSH2('ss', $signature);
+
+                $key = RSA::loadFormat('OpenSSH', $server_public_host_key)
+                    ->withPadding(RSA::SIGNATURE_PKCS1);
+                switch ($this->signature_format) {
+                    case 'rsa-sha2-512':
+                        $hash = 'sha512';
+                        break;
+                    case 'rsa-sha2-256':
+                        $hash = 'sha256';
+                        break;
+                    //case 'ssh-rsa':
+                    default:
+                        $hash = 'sha1';
+                }
+                $key = $key->withHash($hash);
+                break;
+            default:
+                $this->disconnect_helper(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+                throw new NoSupportedAlgorithmsException('Unsupported signature format');
+        }
+
+        if (!$key->verify($this->exchange_hash, $signature)) {
+            return $this->disconnect_helper(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+        };
+
+        return $this->signature_format . ' ' . $server_public_host_key;
+    }
+
+    /**
+     * Returns the exit status of an SSH command or false.
+     *
+     * @return false|int
+     */
+    public function getExitStatus()
+    {
+        if (is_null($this->exit_status)) {
+            return false;
+        }
+        return $this->exit_status;
+    }
+
+    /**
+     * Returns the number of columns for the terminal window size.
+     *
+     * @return int
+     */
+    public function getWindowColumns()
+    {
+        return $this->windowColumns;
+    }
+
+    /**
+     * Returns the number of rows for the terminal window size.
+     *
+     * @return int
+     */
+    public function getWindowRows()
+    {
+        return $this->windowRows;
+    }
+
+    /**
+     * Sets the number of columns for the terminal window size.
+     *
+     * @param int $value
+     */
+    public function setWindowColumns($value)
+    {
+        $this->windowColumns = $value;
+    }
+
+    /**
+     * Sets the number of rows for the terminal window size.
+     *
+     * @param int $value
+     */
+    public function setWindowRows($value)
+    {
+        $this->windowRows = $value;
+    }
+
+    /**
+     * Sets the number of columns and rows for the terminal window size.
+     *
+     * @param int $columns
+     * @param int $rows
+     */
+    public function setWindowSize($columns = 80, $rows = 24)
+    {
+        $this->windowColumns = $columns;
+        $this->windowRows = $rows;
+    }
+
+    /**
+     * To String Magic Method
+     *
+     * @return string
+     */
+    #[\ReturnTypeWillChange]
+    public function __toString()
+    {
+        return $this->getResourceId();
+    }
+
+    /**
+     * Get Resource ID
+     *
+     * We use {} because that symbols should not be in URL according to
+     * {@link http://tools.ietf.org/html/rfc3986#section-2 RFC}.
+     * It will safe us from any conflicts, because otherwise regexp will
+     * match all alphanumeric domains.
+     *
+     * @return string
+     */
+    public function getResourceId()
+    {
+        return '{' . spl_object_hash($this) . '}';
+    }
+
+    /**
+     * Return existing connection
+     *
+     * @param string $id
+     *
+     * @return bool|SSH2 will return false if no such connection
+     */
+    public static function getConnectionByResourceId($id)
+    {
+        if (isset(self::$connections[$id])) {
+            return self::$connections[$id] instanceof \WeakReference ? self::$connections[$id]->get() : self::$connections[$id];
+        }
+        return false;
+    }
+
+    /**
+     * Return all excising connections
+     *
+     * @return array<string, SSH2>
+     */
+    public static function getConnections()
+    {
+        if (!class_exists('WeakReference')) {
+            /** @var array<string, SSH2> */
+            return self::$connections;
+        }
+        $temp = [];
+        foreach (self::$connections as $key => $ref) {
+            $temp[$key] = $ref->get();
+        }
+        return $temp;
+    }
+
+    /*
+     * Update packet types in log history
+     *
+     * @param string $old
+     * @param string $new
+     */
+    private function updateLogHistory($old, $new)
+    {
+        if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == self::LOG_COMPLEX) {
+            $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
+                $old,
+                $new,
+                $this->message_number_log[count($this->message_number_log) - 1]
+            );
+        }
+    }
+
+    /**
+     * Return the list of authentication methods that may productively continue authentication.
+     *
+     * @see https://tools.ietf.org/html/rfc4252#section-5.1
+     * @return array|null
+     */
+    public function getAuthMethodsToContinue()
+    {
+        return $this->auth_methods_to_continue;
+    }
+
+    /**
+     * Enables "smart" multi-factor authentication (MFA)
+     */
+    public function enableSmartMFA()
+    {
+        $this->smartMFA = true;
+    }
+
+    /**
+     * Disables "smart" multi-factor authentication (MFA)
+     */
+    public function disableSmartMFA()
+    {
+        $this->smartMFA = false;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,306 @@
+<?php
+
+/**
+ * Pure-PHP ssh-agent client.
+ *
+ * {@internal See http://api.libssh.org/rfc/PROTOCOL.agent}
+ *
+ * PHP version 5
+ *
+ * Here are some examples of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $agent = new \phpseclib3\System\SSH\Agent();
+ *
+ *    $ssh = new \phpseclib3\Net\SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', $agent)) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('pwd');
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2014 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\System\SSH;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\PublicKey;
+use phpseclib3\Crypt\PublicKeyLoader;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Exception\BadConfigurationException;
+use phpseclib3\Net\SSH2;
+use phpseclib3\System\SSH\Agent\Identity;
+
+/**
+ * Pure-PHP ssh-agent client identity factory
+ *
+ * requestIdentities() method pumps out \phpseclib3\System\SSH\Agent\Identity objects
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+class Agent
+{
+    use Common\Traits\ReadBytes;
+
+    // Message numbers
+
+    // to request SSH1 keys you have to use SSH_AGENTC_REQUEST_RSA_IDENTITIES (1)
+    const SSH_AGENTC_REQUEST_IDENTITIES = 11;
+    // this is the SSH2 response; the SSH1 response is SSH_AGENT_RSA_IDENTITIES_ANSWER (2).
+    const SSH_AGENT_IDENTITIES_ANSWER = 12;
+    // the SSH1 request is SSH_AGENTC_RSA_CHALLENGE (3)
+    const SSH_AGENTC_SIGN_REQUEST = 13;
+    // the SSH1 response is SSH_AGENT_RSA_RESPONSE (4)
+    const SSH_AGENT_SIGN_RESPONSE = 14;
+
+    // Agent forwarding status
+
+    // no forwarding requested and not active
+    const FORWARD_NONE = 0;
+    // request agent forwarding when opportune
+    const FORWARD_REQUEST = 1;
+    // forwarding has been request and is active
+    const FORWARD_ACTIVE = 2;
+
+    /**
+     * Unused
+     */
+    const SSH_AGENT_FAILURE = 5;
+
+    /**
+     * Socket Resource
+     *
+     * @var resource
+     */
+    private $fsock;
+
+    /**
+     * Agent forwarding status
+     *
+     * @var int
+     */
+    private $forward_status = self::FORWARD_NONE;
+
+    /**
+     * Buffer for accumulating forwarded authentication
+     * agent data arriving on SSH data channel destined
+     * for agent unix socket
+     *
+     * @var string
+     */
+    private $socket_buffer = '';
+
+    /**
+     * Tracking the number of bytes we are expecting
+     * to arrive for the agent socket on the SSH data
+     * channel
+     *
+     * @var int
+     */
+    private $expected_bytes = 0;
+
+    /**
+     * Default Constructor
+     *
+     * @return Agent
+     * @throws BadConfigurationException if SSH_AUTH_SOCK cannot be found
+     * @throws \RuntimeException on connection errors
+     */
+    public function __construct($address = null)
+    {
+        if (!$address) {
+            switch (true) {
+                case isset($_SERVER['SSH_AUTH_SOCK']):
+                    $address = $_SERVER['SSH_AUTH_SOCK'];
+                    break;
+                case isset($_ENV['SSH_AUTH_SOCK']):
+                    $address = $_ENV['SSH_AUTH_SOCK'];
+                    break;
+                default:
+                    throw new BadConfigurationException('SSH_AUTH_SOCK not found');
+            }
+        }
+
+        if (in_array('unix', stream_get_transports())) {
+            $this->fsock = fsockopen('unix://' . $address, 0, $errno, $errstr);
+            if (!$this->fsock) {
+                throw new \RuntimeException("Unable to connect to ssh-agent (Error $errno: $errstr)");
+            }
+        } else {
+            if (substr($address, 0, 9) != '\\\\.\\pipe\\' || strpos(substr($address, 9), '\\') !== false) {
+                throw new \RuntimeException('Address is not formatted as a named pipe should be');
+            }
+
+            $this->fsock = fopen($address, 'r+b');
+            if (!$this->fsock) {
+                throw new \RuntimeException('Unable to open address');
+            }
+        }
+    }
+
+    /**
+     * Request Identities
+     *
+     * See "2.5.2 Requesting a list of protocol 2 keys"
+     * Returns an array containing zero or more \phpseclib3\System\SSH\Agent\Identity objects
+     *
+     * @return array
+     * @throws \RuntimeException on receipt of unexpected packets
+     */
+    public function requestIdentities()
+    {
+        if (!$this->fsock) {
+            return [];
+        }
+
+        $packet = pack('NC', 1, self::SSH_AGENTC_REQUEST_IDENTITIES);
+        if (strlen($packet) != fputs($this->fsock, $packet)) {
+            throw new \RuntimeException('Connection closed while requesting identities');
+        }
+
+        $length = current(unpack('N', $this->readBytes(4)));
+        $packet = $this->readBytes($length);
+
+        list($type, $keyCount) = Strings::unpackSSH2('CN', $packet);
+        if ($type != self::SSH_AGENT_IDENTITIES_ANSWER) {
+            throw new \RuntimeException('Unable to request identities');
+        }
+
+        $identities = [];
+        for ($i = 0; $i < $keyCount; $i++) {
+            list($key_blob, $comment) = Strings::unpackSSH2('ss', $packet);
+            $temp = $key_blob;
+            list($key_type) = Strings::unpackSSH2('s', $temp);
+            switch ($key_type) {
+                case 'ssh-rsa':
+                case 'ssh-dss':
+                case 'ssh-ed25519':
+                case 'ecdsa-sha2-nistp256':
+                case 'ecdsa-sha2-nistp384':
+                case 'ecdsa-sha2-nistp521':
+                    $key = PublicKeyLoader::load($key_type . ' ' . base64_encode($key_blob));
+            }
+            // resources are passed by reference by default
+            if (isset($key)) {
+                $identity = (new Identity($this->fsock))
+                    ->withPublicKey($key)
+                    ->withPublicKeyBlob($key_blob)
+                    ->withComment($comment);
+                $identities[] = $identity;
+                unset($key);
+            }
+        }
+
+        return $identities;
+    }
+
+    /**
+     * Returns the SSH Agent identity matching a given public key or null if no identity is found
+     *
+     * @return ?Identity
+     */
+    public function findIdentityByPublicKey(PublicKey $key)
+    {
+        $identities = $this->requestIdentities();
+        $key = (string) $key;
+        foreach ($identities as $identity) {
+            if (((string) $identity->getPublicKey()) == $key) {
+                return $identity;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Signal that agent forwarding should
+     * be requested when a channel is opened
+     *
+     * @return void
+     */
+    public function startSSHForwarding()
+    {
+        if ($this->forward_status == self::FORWARD_NONE) {
+            $this->forward_status = self::FORWARD_REQUEST;
+        }
+    }
+
+    /**
+     * Request agent forwarding of remote server
+     *
+     * @param SSH2 $ssh
+     * @return bool
+     */
+    private function request_forwarding(SSH2 $ssh)
+    {
+        if (!$ssh->requestAgentForwarding()) {
+            return false;
+        }
+
+        $this->forward_status = self::FORWARD_ACTIVE;
+
+        return true;
+    }
+
+    /**
+     * On successful channel open
+     *
+     * This method is called upon successful channel
+     * open to give the SSH Agent an opportunity
+     * to take further action. i.e. request agent forwarding
+     *
+     * @param SSH2 $ssh
+     */
+    public function registerChannelOpen(SSH2 $ssh)
+    {
+        if ($this->forward_status == self::FORWARD_REQUEST) {
+            $this->request_forwarding($ssh);
+        }
+    }
+
+    /**
+     * Forward data to SSH Agent and return data reply
+     *
+     * @param string $data
+     * @return string Data from SSH Agent
+     * @throws \RuntimeException on connection errors
+     */
+    public function forwardData($data)
+    {
+        if ($this->expected_bytes > 0) {
+            $this->socket_buffer .= $data;
+            $this->expected_bytes -= strlen($data);
+        } else {
+            $agent_data_bytes = current(unpack('N', $data));
+            $current_data_bytes = strlen($data);
+            $this->socket_buffer = $data;
+            if ($current_data_bytes != $agent_data_bytes + 4) {
+                $this->expected_bytes = ($agent_data_bytes + 4) - $current_data_bytes;
+                return false;
+            }
+        }
+
+        if (strlen($this->socket_buffer) != fwrite($this->fsock, $this->socket_buffer)) {
+            throw new \RuntimeException('Connection closed attempting to forward data to SSH agent');
+        }
+
+        $this->socket_buffer = '';
+        $this->expected_bytes = 0;
+
+        $agent_reply_bytes = current(unpack('N', $this->readBytes(4)));
+
+        $agent_reply_data = $this->readBytes($agent_reply_bytes);
+        $agent_reply_data = current(unpack('a*', $agent_reply_data));
+
+        return pack('Na*', $agent_reply_bytes, $agent_reply_data);
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent/Identity.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent/Identity.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/System/SSH/Agent/Identity.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,346 @@
+<?php
+
+/**
+ * Pure-PHP ssh-agent client.
+ *
+ * {@internal See http://api.libssh.org/rfc/PROTOCOL.agent}
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\System\SSH\Agent;
+
+use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\PrivateKey;
+use phpseclib3\Crypt\Common\PublicKey;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\EC;
+use phpseclib3\Crypt\RSA;
+use phpseclib3\Exception\UnsupportedAlgorithmException;
+use phpseclib3\System\SSH\Agent;
+use phpseclib3\System\SSH\Common\Traits\ReadBytes;
+
+/**
+ * Pure-PHP ssh-agent client identity object
+ *
+ * Instantiation should only be performed by \phpseclib3\System\SSH\Agent class.
+ * This could be thought of as implementing an interface that phpseclib3\Crypt\RSA
+ * implements. ie. maybe a Net_SSH_Auth_PublicKey interface or something.
+ * The methods in this interface would be getPublicKey and sign since those are the
+ * methods phpseclib looks for to perform public key authentication.
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @internal
+ */
+class Identity implements PrivateKey
+{
+    use ReadBytes;
+
+    // Signature Flags
+    // See https://tools.ietf.org/html/draft-miller-ssh-agent-00#section-5.3
+    const SSH_AGENT_RSA2_256 = 2;
+    const SSH_AGENT_RSA2_512 = 4;
+
+    /**
+     * Key Object
+     *
+     * @var PublicKey
+     * @see self::getPublicKey()
+     */
+    private $key;
+
+    /**
+     * Key Blob
+     *
+     * @var string
+     * @see self::sign()
+     */
+    private $key_blob;
+
+    /**
+     * Socket Resource
+     *
+     * @var resource
+     * @see self::sign()
+     */
+    private $fsock;
+
+    /**
+     * Signature flags
+     *
+     * @var int
+     * @see self::sign()
+     * @see self::setHash()
+     */
+    private $flags = 0;
+
+    /**
+     * Comment
+     *
+     * @var null|string
+     */
+    private $comment;
+
+    /**
+     * Curve Aliases
+     *
+     * @var array
+     */
+    private static $curveAliases = [
+        'secp256r1' => 'nistp256',
+        'secp384r1' => 'nistp384',
+        'secp521r1' => 'nistp521',
+        'Ed25519' => 'Ed25519'
+    ];
+
+    /**
+     * Default Constructor.
+     *
+     * @param resource $fsock
+     */
+    public function __construct($fsock)
+    {
+        $this->fsock = $fsock;
+    }
+
+    /**
+     * Set Public Key
+     *
+     * Called by \phpseclib3\System\SSH\Agent::requestIdentities()
+     *
+     * @param PublicKey $key
+     */
+    public function withPublicKey(PublicKey $key)
+    {
+        if ($key instanceof EC) {
+            if (is_array($key->getCurve()) || !isset(self::$curveAliases[$key->getCurve()])) {
+                throw new UnsupportedAlgorithmException('The only supported curves are nistp256, nistp384, nistp512 and Ed25519');
+            }
+        }
+
+        $new = clone $this;
+        $new->key = $key;
+        return $new;
+    }
+
+    /**
+     * Set Public Key
+     *
+     * Called by \phpseclib3\System\SSH\Agent::requestIdentities(). The key blob could be extracted from $this->key
+     * but this saves a small amount of computation.
+     *
+     * @param string $key_blob
+     */
+    public function withPublicKeyBlob($key_blob)
+    {
+        $new = clone $this;
+        $new->key_blob = $key_blob;
+        return $new;
+    }
+
+    /**
+     * Get Public Key
+     *
+     * Wrapper for $this->key->getPublicKey()
+     *
+     * @return mixed
+     */
+    public function getPublicKey()
+    {
+        return $this->key;
+    }
+
+    /**
+     * Sets the hash
+     *
+     * @param string $hash
+     */
+    public function withHash($hash)
+    {
+        $new = clone $this;
+
+        $hash = strtolower($hash);
+
+        if ($this->key instanceof RSA) {
+            $new->flags = 0;
+            switch ($hash) {
+                case 'sha1':
+                    break;
+                case 'sha256':
+                    $new->flags = self::SSH_AGENT_RSA2_256;
+                    break;
+                case 'sha512':
+                    $new->flags = self::SSH_AGENT_RSA2_512;
+                    break;
+                default:
+                    throw new UnsupportedAlgorithmException('The only supported hashes for RSA are sha1, sha256 and sha512');
+            }
+        }
+        if ($this->key instanceof EC) {
+            switch ($this->key->getCurve()) {
+                case 'secp256r1':
+                    $expectedHash = 'sha256';
+                    break;
+                case 'secp384r1':
+                    $expectedHash = 'sha384';
+                    break;
+                //case 'secp521r1':
+                //case 'Ed25519':
+                default:
+                    $expectedHash = 'sha512';
+            }
+            if ($hash != $expectedHash) {
+                throw new UnsupportedAlgorithmException('The only supported hash for ' . self::$curveAliases[$this->key->getCurve()] . ' is ' . $expectedHash);
+            }
+        }
+        if ($this->key instanceof DSA) {
+            if ($hash != 'sha1') {
+                throw new UnsupportedAlgorithmException('The only supported hash for DSA is sha1');
+            }
+        }
+        return $new;
+    }
+
+    /**
+     * Sets the padding
+     *
+     * Only PKCS1 padding is supported
+     *
+     * @param string $padding
+     */
+    public function withPadding($padding)
+    {
+        if (!$this->key instanceof RSA) {
+            throw new UnsupportedAlgorithmException('Only RSA keys support padding');
+        }
+        if ($padding != RSA::SIGNATURE_PKCS1 && $padding != RSA::SIGNATURE_RELAXED_PKCS1) {
+            throw new UnsupportedAlgorithmException('ssh-agent can only create PKCS1 signatures');
+        }
+        return $this;
+    }
+
+    /**
+     * Determines the signature padding mode
+     *
+     * Valid values are: ASN1, SSH2, Raw
+     *
+     * @param string $format
+     */
+    public function withSignatureFormat($format)
+    {
+        if ($this->key instanceof RSA) {
+            throw new UnsupportedAlgorithmException('Only DSA and EC keys support signature format setting');
+        }
+        if ($format != 'SSH2') {
+            throw new UnsupportedAlgorithmException('Only SSH2-formatted signatures are currently supported');
+        }
+
+        return $this;
+    }
+
+    /**
+     * Returns the curve
+     *
+     * Returns a string if it's a named curve, an array if not
+     *
+     * @return string|array
+     */
+    public function getCurve()
+    {
+        if (!$this->key instanceof EC) {
+            throw new UnsupportedAlgorithmException('Only EC keys have curves');
+        }
+
+        return $this->key->getCurve();
+    }
+
+    /**
+     * Create a signature
+     *
+     * See "2.6.2 Protocol 2 private key signature request"
+     *
+     * @param string $message
+     * @return string
+     * @throws \RuntimeException on connection errors
+     * @throws UnsupportedAlgorithmException if the algorithm is unsupported
+     */
+    public function sign($message)
+    {
+        // the last parameter (currently 0) is for flags and ssh-agent only defines one flag (for ssh-dss): SSH_AGENT_OLD_SIGNATURE
+        $packet = Strings::packSSH2(
+            'CssN',
+            Agent::SSH_AGENTC_SIGN_REQUEST,
+            $this->key_blob,
+            $message,
+            $this->flags
+        );
+        $packet = Strings::packSSH2('s', $packet);
+        if (strlen($packet) != fputs($this->fsock, $packet)) {
+            throw new \RuntimeException('Connection closed during signing');
+        }
+
+        $length = current(unpack('N', $this->readBytes(4)));
+        $packet = $this->readBytes($length);
+
+        list($type, $signature_blob) = Strings::unpackSSH2('Cs', $packet);
+        if ($type != Agent::SSH_AGENT_SIGN_RESPONSE) {
+            throw new \RuntimeException('Unable to retrieve signature');
+        }
+
+        if (!$this->key instanceof RSA) {
+            return $signature_blob;
+        }
+
+        list($type, $signature_blob) = Strings::unpackSSH2('ss', $signature_blob);
+
+        return $signature_blob;
+    }
+
+    /**
+     * Returns the private key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        throw new \RuntimeException('ssh-agent does not provide a mechanism to get the private key');
+    }
+
+    /**
+     * Sets the password
+     *
+     * @param string|bool $password
+     * @return never
+     */
+    public function withPassword($password = false)
+    {
+        throw new \RuntimeException('ssh-agent does not provide a mechanism to get the private key');
+    }
+
+    /**
+     * Sets the comment
+     */
+    public function withComment($comment = null)
+    {
+        $new = clone $this;
+        $new->comment = $comment;
+        return $new;
+    }
+
+    /**
+     * Returns the comment
+     *
+     * @return null|string
+     */
+    public function getComment()
+    {
+        return $this->comment;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/System/SSH/Common/Traits/ReadBytes.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/System/SSH/Common/Traits/ReadBytes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/System/SSH/Common/Traits/ReadBytes.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * ReadBytes trait
+ *
+ * PHP version 5
+ *
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\System\SSH\Common\Traits;
+
+/**
+ * ReadBytes trait
+ *
+ * @author  Jim Wigginton <terrafrost@php.net>
+ */
+trait ReadBytes
+{
+    /**
+     * Read data
+     *
+     * @param int $length
+     * @throws \RuntimeException on connection errors
+     */
+    public function readBytes($length)
+    {
+        $temp = fread($this->fsock, $length);
+        if (strlen($temp) != $length) {
+            throw new \RuntimeException("Expected $length bytes; got " . strlen($temp));
+        }
+        return $temp;
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/bootstrap.php
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/bootstrap.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/bootstrap.php	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Bootstrapping File for phpseclib
+ *
+ * composer isn't a requirement for phpseclib 2.0 but this file isn't really required
+ * either. it's a bonus for those using composer but if you're not phpseclib will
+ * still work
+ *
+ * @license http://www.opensource.org/licenses/mit-license.html MIT License
+ */
+
+if (extension_loaded('mbstring')) {
+    // 2 - MB_OVERLOAD_STRING
+    // mbstring.func_overload is deprecated in php 7.2 and removed in php 8.0.
+    if (version_compare(PHP_VERSION, '8.0.0') < 0 && ini_get('mbstring.func_overload') & 2) {
+        throw new UnexpectedValueException(
+            'Overloading of string functions using mbstring.func_overload ' .
+            'is not supported by phpseclib.'
+        );
+    }
+}
Index: vendor/phpseclib/phpseclib/phpseclib/openssl.cnf
===================================================================
--- vendor/phpseclib/phpseclib/phpseclib/openssl.cnf	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
+++ vendor/phpseclib/phpseclib/phpseclib/openssl.cnf	(revision e3d4e0a8bc0f13135f27c0b055b5c00f64a28f01)
@@ -0,0 +1,6 @@
+# minimalist openssl.cnf file for use with phpseclib
+
+HOME			= .
+RANDFILE		= $ENV::HOME/.rnd
+
+[ v3_ca ]
