/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define("@angular/compiler/src/i18n/digest", ["require", "exports", "tslib", "@angular/compiler/src/util", "@angular/compiler/src/i18n/big_integer"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.computeMsgId = exports.fingerprint = exports.sha1 = exports.serializeNodes = exports.computeDecimalDigest = exports.decimalDigest = exports.computeDigest = exports.digest = void 0;
    var tslib_1 = require("tslib");
    var util_1 = require("@angular/compiler/src/util");
    var big_integer_1 = require("@angular/compiler/src/i18n/big_integer");
    /**
     * Return the message id or compute it using the XLIFF1 digest.
     */
    function digest(message) {
        return message.id || computeDigest(message);
    }
    exports.digest = digest;
    /**
     * Compute the message id using the XLIFF1 digest.
     */
    function computeDigest(message) {
        return sha1(serializeNodes(message.nodes).join('') + ("[" + message.meaning + "]"));
    }
    exports.computeDigest = computeDigest;
    /**
     * Return the message id or compute it using the XLIFF2/XMB/$localize digest.
     */
    function decimalDigest(message) {
        return message.id || computeDecimalDigest(message);
    }
    exports.decimalDigest = decimalDigest;
    /**
     * Compute the message id using the XLIFF2/XMB/$localize digest.
     */
    function computeDecimalDigest(message) {
        var visitor = new _SerializerIgnoreIcuExpVisitor();
        var parts = message.nodes.map(function (a) { return a.visit(visitor, null); });
        return computeMsgId(parts.join(''), message.meaning);
    }
    exports.computeDecimalDigest = computeDecimalDigest;
    /**
     * Serialize the i18n ast to something xml-like in order to generate an UID.
     *
     * The visitor is also used in the i18n parser tests
     *
     * @internal
     */
    var _SerializerVisitor = /** @class */ (function () {
        function _SerializerVisitor() {
        }
        _SerializerVisitor.prototype.visitText = function (text, context) {
            return text.value;
        };
        _SerializerVisitor.prototype.visitContainer = function (container, context) {
            var _this = this;
            return "[" + container.children.map(function (child) { return child.visit(_this); }).join(', ') + "]";
        };
        _SerializerVisitor.prototype.visitIcu = function (icu, context) {
            var _this = this;
            var strCases = Object.keys(icu.cases).map(function (k) { return k + " {" + icu.cases[k].visit(_this) + "}"; });
            return "{" + icu.expression + ", " + icu.type + ", " + strCases.join(', ') + "}";
        };
        _SerializerVisitor.prototype.visitTagPlaceholder = function (ph, context) {
            var _this = this;
            return ph.isVoid ?
                "<ph tag name=\"" + ph.startName + "\"/>" :
                "<ph tag name=\"" + ph.startName + "\">" + ph.children.map(function (child) { return child.visit(_this); }).join(', ') + "</ph name=\"" + ph.closeName + "\">";
        };
        _SerializerVisitor.prototype.visitPlaceholder = function (ph, context) {
            return ph.value ? "<ph name=\"" + ph.name + "\">" + ph.value + "</ph>" : "<ph name=\"" + ph.name + "\"/>";
        };
        _SerializerVisitor.prototype.visitIcuPlaceholder = function (ph, context) {
            return "<ph icu name=\"" + ph.name + "\">" + ph.value.visit(this) + "</ph>";
        };
        return _SerializerVisitor;
    }());
    var serializerVisitor = new _SerializerVisitor();
    function serializeNodes(nodes) {
        return nodes.map(function (a) { return a.visit(serializerVisitor, null); });
    }
    exports.serializeNodes = serializeNodes;
    /**
     * Serialize the i18n ast to something xml-like in order to generate an UID.
     *
     * Ignore the ICU expressions so that message IDs stays identical if only the expression changes.
     *
     * @internal
     */
    var _SerializerIgnoreIcuExpVisitor = /** @class */ (function (_super) {
        tslib_1.__extends(_SerializerIgnoreIcuExpVisitor, _super);
        function _SerializerIgnoreIcuExpVisitor() {
            return _super !== null && _super.apply(this, arguments) || this;
        }
        _SerializerIgnoreIcuExpVisitor.prototype.visitIcu = function (icu, context) {
            var _this = this;
            var strCases = Object.keys(icu.cases).map(function (k) { return k + " {" + icu.cases[k].visit(_this) + "}"; });
            // Do not take the expression into account
            return "{" + icu.type + ", " + strCases.join(', ') + "}";
        };
        return _SerializerIgnoreIcuExpVisitor;
    }(_SerializerVisitor));
    /**
     * Compute the SHA1 of the given string
     *
     * see https://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
     *
     * WARNING: this function has not been designed not tested with security in mind.
     *          DO NOT USE IT IN A SECURITY SENSITIVE CONTEXT.
     */
    function sha1(str) {
        var utf8 = util_1.utf8Encode(str);
        var words32 = bytesToWords32(utf8, Endian.Big);
        var len = utf8.length * 8;
        var w = util_1.newArray(80);
        var a = 0x67452301, b = 0xefcdab89, c = 0x98badcfe, d = 0x10325476, e = 0xc3d2e1f0;
        words32[len >> 5] |= 0x80 << (24 - len % 32);
        words32[((len + 64 >> 9) << 4) + 15] = len;
        for (var i = 0; i < words32.length; i += 16) {
            var h0 = a, h1 = b, h2 = c, h3 = d, h4 = e;
            for (var j = 0; j < 80; j++) {
                if (j < 16) {
                    w[j] = words32[i + j];
                }
                else {
                    w[j] = rol32(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
                }
                var fkVal = fk(j, b, c, d);
                var f = fkVal[0];
                var k = fkVal[1];
                var temp = [rol32(a, 5), f, e, k, w[j]].reduce(add32);
                e = d;
                d = c;
                c = rol32(b, 30);
                b = a;
                a = temp;
            }
            a = add32(a, h0);
            b = add32(b, h1);
            c = add32(c, h2);
            d = add32(d, h3);
            e = add32(e, h4);
        }
        return bytesToHexString(words32ToByteString([a, b, c, d, e]));
    }
    exports.sha1 = sha1;
    function fk(index, b, c, d) {
        if (index < 20) {
            return [(b & c) | (~b & d), 0x5a827999];
        }
        if (index < 40) {
            return [b ^ c ^ d, 0x6ed9eba1];
        }
        if (index < 60) {
            return [(b & c) | (b & d) | (c & d), 0x8f1bbcdc];
        }
        return [b ^ c ^ d, 0xca62c1d6];
    }
    /**
     * Compute the fingerprint of the given string
     *
     * The output is 64 bit number encoded as a decimal string
     *
     * based on:
     * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/GoogleJsMessageIdGenerator.java
     */
    function fingerprint(str) {
        var utf8 = util_1.utf8Encode(str);
        var hi = hash32(utf8, 0);
        var lo = hash32(utf8, 102072);
        if (hi == 0 && (lo == 0 || lo == 1)) {
            hi = hi ^ 0x130f9bef;
            lo = lo ^ -0x6b5f56d8;
        }
        return [hi, lo];
    }
    exports.fingerprint = fingerprint;
    function computeMsgId(msg, meaning) {
        if (meaning === void 0) { meaning = ''; }
        var msgFingerprint = fingerprint(msg);
        if (meaning) {
            var meaningFingerprint = fingerprint(meaning);
            msgFingerprint = add64(rol64(msgFingerprint, 1), meaningFingerprint);
        }
        var hi = msgFingerprint[0];
        var lo = msgFingerprint[1];
        return wordsToDecimalString(hi & 0x7fffffff, lo);
    }
    exports.computeMsgId = computeMsgId;
    function hash32(bytes, c) {
        var a = 0x9e3779b9, b = 0x9e3779b9;
        var i;
        var len = bytes.length;
        for (i = 0; i + 12 <= len; i += 12) {
            a = add32(a, wordAt(bytes, i, Endian.Little));
            b = add32(b, wordAt(bytes, i + 4, Endian.Little));
            c = add32(c, wordAt(bytes, i + 8, Endian.Little));
            var res = mix(a, b, c);
            a = res[0], b = res[1], c = res[2];
        }
        a = add32(a, wordAt(bytes, i, Endian.Little));
        b = add32(b, wordAt(bytes, i + 4, Endian.Little));
        // the first byte of c is reserved for the length
        c = add32(c, len);
        c = add32(c, wordAt(bytes, i + 8, Endian.Little) << 8);
        return mix(a, b, c)[2];
    }
    // clang-format off
    function mix(a, b, c) {
        a = sub32(a, b);
        a = sub32(a, c);
        a ^= c >>> 13;
        b = sub32(b, c);
        b = sub32(b, a);
        b ^= a << 8;
        c = sub32(c, a);
        c = sub32(c, b);
        c ^= b >>> 13;
        a = sub32(a, b);
        a = sub32(a, c);
        a ^= c >>> 12;
        b = sub32(b, c);
        b = sub32(b, a);
        b ^= a << 16;
        c = sub32(c, a);
        c = sub32(c, b);
        c ^= b >>> 5;
        a = sub32(a, b);
        a = sub32(a, c);
        a ^= c >>> 3;
        b = sub32(b, c);
        b = sub32(b, a);
        b ^= a << 10;
        c = sub32(c, a);
        c = sub32(c, b);
        c ^= b >>> 15;
        return [a, b, c];
    }
    // clang-format on
    // Utils
    var Endian;
    (function (Endian) {
        Endian[Endian["Little"] = 0] = "Little";
        Endian[Endian["Big"] = 1] = "Big";
    })(Endian || (Endian = {}));
    function add32(a, b) {
        return add32to64(a, b)[1];
    }
    function add32to64(a, b) {
        var low = (a & 0xffff) + (b & 0xffff);
        var high = (a >>> 16) + (b >>> 16) + (low >>> 16);
        return [high >>> 16, (high << 16) | (low & 0xffff)];
    }
    function add64(a, b) {
        var ah = a[0], al = a[1];
        var bh = b[0], bl = b[1];
        var result = add32to64(al, bl);
        var carry = result[0];
        var l = result[1];
        var h = add32(add32(ah, bh), carry);
        return [h, l];
    }
    function sub32(a, b) {
        var low = (a & 0xffff) - (b & 0xffff);
        var high = (a >> 16) - (b >> 16) + (low >> 16);
        return (high << 16) | (low & 0xffff);
    }
    // Rotate a 32b number left `count` position
    function rol32(a, count) {
        return (a << count) | (a >>> (32 - count));
    }
    // Rotate a 64b number left `count` position
    function rol64(num, count) {
        var hi = num[0], lo = num[1];
        var h = (hi << count) | (lo >>> (32 - count));
        var l = (lo << count) | (hi >>> (32 - count));
        return [h, l];
    }
    function bytesToWords32(bytes, endian) {
        var size = (bytes.length + 3) >>> 2;
        var words32 = [];
        for (var i = 0; i < size; i++) {
            words32[i] = wordAt(bytes, i * 4, endian);
        }
        return words32;
    }
    function byteAt(bytes, index) {
        return index >= bytes.length ? 0 : bytes[index];
    }
    function wordAt(bytes, index, endian) {
        var word = 0;
        if (endian === Endian.Big) {
            for (var i = 0; i < 4; i++) {
                word += byteAt(bytes, index + i) << (24 - 8 * i);
            }
        }
        else {
            for (var i = 0; i < 4; i++) {
                word += byteAt(bytes, index + i) << 8 * i;
            }
        }
        return word;
    }
    function words32ToByteString(words32) {
        return words32.reduce(function (bytes, word) { return bytes.concat(word32ToByteString(word)); }, []);
    }
    function word32ToByteString(word) {
        var bytes = [];
        for (var i = 0; i < 4; i++) {
            bytes.push((word >>> 8 * (3 - i)) & 0xff);
        }
        return bytes;
    }
    function bytesToHexString(bytes) {
        var hex = '';
        for (var i = 0; i < bytes.length; i++) {
            var b = byteAt(bytes, i);
            hex += (b >>> 4).toString(16) + (b & 0x0f).toString(16);
        }
        return hex.toLowerCase();
    }
    /**
     * Create a shared exponentiation pool for base-256 computations. This shared pool provides memoized
     * power-of-256 results with memoized power-of-two computations for efficient multiplication.
     *
     * For our purposes, this can be safely stored as a global without memory concerns. The reason is
     * that we encode two words, so only need the 0th (for the low word) and 4th (for the high word)
     * exponent.
     */
    var base256 = new big_integer_1.BigIntExponentiation(256);
    /**
     * Represents two 32-bit words as a single decimal number. This requires a big integer storage
     * model as JS numbers are not accurate enough to represent the 64-bit number.
     *
     * Based on https://www.danvk.org/hex2dec.html
     */
    function wordsToDecimalString(hi, lo) {
        // Encode the four bytes in lo in the lower digits of the decimal number.
        // Note: the multiplication results in lo itself but represented by a big integer using its
        // decimal digits.
        var decimal = base256.toThePowerOf(0).multiplyBy(lo);
        // Encode the four bytes in hi above the four lo bytes. lo is a maximum of (2^8)^4, which is why
        // this multiplication factor is applied.
        base256.toThePowerOf(4).multiplyByAndAddTo(hi, decimal);
        return decimal.toString();
    }
});
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Byte, newArray, utf8Encode} from '../util';\nimport {BigIntExponentiation} from './big_integer';\n\nimport * as i18n from './i18n_ast';\n\n/**\n * Return the message id or compute it using the XLIFF1 digest.\n */\nexport function digest(message: i18n.Message): string {\n  return message.id || computeDigest(message);\n}\n\n/**\n * Compute the message id using the XLIFF1 digest.\n */\nexport function computeDigest(message: i18n.Message): string {\n  return sha1(serializeNodes(message.nodes).join('') + `[${message.meaning}]`);\n}\n\n/**\n * Return the message id or compute it using the XLIFF2/XMB/$localize digest.\n */\nexport function decimalDigest(message: i18n.Message): string {\n  return message.id || computeDecimalDigest(message);\n}\n\n/**\n * Compute the message id using the XLIFF2/XMB/$localize digest.\n */\nexport function computeDecimalDigest(message: i18n.Message): string {\n  const visitor = new _SerializerIgnoreIcuExpVisitor();\n  const parts = message.nodes.map(a => a.visit(visitor, null));\n  return computeMsgId(parts.join(''), message.meaning);\n}\n\n/**\n * Serialize the i18n ast to something xml-like in order to generate an UID.\n *\n * The visitor is also used in the i18n parser tests\n *\n * @internal\n */\nclass _SerializerVisitor implements i18n.Visitor {\n  visitText(text: i18n.Text, context: any): any {\n    return text.value;\n  }\n\n  visitContainer(container: i18n.Container, context: any): any {\n    return `[${container.children.map(child => child.visit(this)).join(', ')}]`;\n  }\n\n  visitIcu(icu: i18n.Icu, context: any): any {\n    const strCases =\n        Object.keys(icu.cases).map((k: string) => `${k} {${icu.cases[k].visit(this)}}`);\n    return `{${icu.expression}, ${icu.type}, ${strCases.join(', ')}}`;\n  }\n\n  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*/\nclass _SerializerIgnoreIcuExpVisitor extends _SerializerVisitor {\n  override visitIcu(icu: i18n.Icu, context: any): any {\n    let strCases = Object.keys(icu.cases).map((k: string) => `${k} {${icu.cases[k].visit(this)}}`);\n    // Do not take the expression into account\n    return `{${icu.type}, ${strCases.join(', ')}}`;\n  }\n}\n\n/**\n * Compute the SHA1 of the given string\n *\n * see https://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf\n *\n * WARNING: this function has not been designed not tested with security in mind.\n *          DO NOT USE IT IN A SECURITY SENSITIVE CONTEXT.\n */\nexport function sha1(str: string): string {\n  const utf8 = utf8Encode(str);\n  const words32 = bytesToWords32(utf8, Endian.Big);\n  const len = utf8.length * 8;\n\n  const w = newArray(80);\n  let a = 0x67452301, b = 0xefcdab89, c = 0x98badcfe, d = 0x10325476, e = 0xc3d2e1f0;\n\n  words32[len >> 5] |= 0x80 << (24 - len % 32);\n  words32[((len + 64 >> 9) << 4) + 15] = len;\n\n  for (let i = 0; i < words32.length; i += 16) {\n    const h0 = a, h1 = b, h2 = c, h3 = d, h4 = e;\n\n    for (let j = 0; j < 80; j++) {\n      if (j < 16) {\n        w[j] = words32[i + j];\n      } else {\n        w[j] = rol32(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);\n      }\n\n      const fkVal = fk(j, b, c, d);\n      const f = fkVal[0];\n      const k = fkVal[1];\n      const temp = [rol32(a, 5), f, e, k, w[j]].reduce(add32);\n      e = d;\n      d = c;\n      c = rol32(b, 30);\n      b = a;\n      a = temp;\n    }\n    a = add32(a, h0);\n    b = add32(b, h1);\n    c = add32(c, h2);\n    d = add32(d, h3);\n    e = add32(e, h4);\n  }\n\n  return bytesToHexString(words32ToByteString([a, b, c, d, e]));\n}\n\nfunction fk(index: number, b: number, c: number, d: number): [number, number] {\n  if (index < 20) {\n    return [(b & c) | (~b & d), 0x5a827999];\n  }\n\n  if (index < 40) {\n    return [b ^ c ^ d, 0x6ed9eba1];\n  }\n\n  if (index < 60) {\n    return [(b & c) | (b & d) | (c & d), 0x8f1bbcdc];\n  }\n\n  return [b ^ c ^ d, 0xca62c1d6];\n}\n\n/**\n * Compute the fingerprint of the given string\n *\n * The output is 64 bit number encoded as a decimal string\n *\n * based on:\n * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/GoogleJsMessageIdGenerator.java\n */\nexport function fingerprint(str: string): [number, number] {\n  const utf8 = utf8Encode(str);\n\n  let hi = hash32(utf8, 0);\n  let lo = hash32(utf8, 102072);\n\n  if (hi == 0 && (lo == 0 || lo == 1)) {\n    hi = hi ^ 0x130f9bef;\n    lo = lo ^ -0x6b5f56d8;\n  }\n\n  return [hi, lo];\n}\n\nexport function computeMsgId(msg: string, meaning: string = ''): string {\n  let msgFingerprint = fingerprint(msg);\n\n  if (meaning) {\n    const meaningFingerprint = fingerprint(meaning);\n    msgFingerprint = add64(rol64(msgFingerprint, 1), meaningFingerprint);\n  }\n\n  const hi = msgFingerprint[0];\n  const lo = msgFingerprint[1];\n\n  return wordsToDecimalString(hi & 0x7fffffff, lo);\n}\n\nfunction hash32(bytes: Byte[], c: number): number {\n  let a = 0x9e3779b9, b = 0x9e3779b9;\n  let i: number;\n\n  const len = bytes.length;\n\n  for (i = 0; i + 12 <= len; i += 12) {\n    a = add32(a, wordAt(bytes, i, Endian.Little));\n    b = add32(b, wordAt(bytes, i + 4, Endian.Little));\n    c = add32(c, wordAt(bytes, i + 8, Endian.Little));\n    const res = mix(a, b, c);\n    a = res[0], b = res[1], c = res[2];\n  }\n\n  a = add32(a, wordAt(bytes, i, Endian.Little));\n  b = add32(b, wordAt(bytes, i + 4, Endian.Little));\n  // the first byte of c is reserved for the length\n  c = add32(c, len);\n  c = add32(c, wordAt(bytes, i + 8, Endian.Little) << 8);\n\n  return mix(a, b, c)[2];\n}\n\n// clang-format off\nfunction mix(a: number, b: number, c: number): [number, number, number] {\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 13;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 8;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 13;\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 12;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 16;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 5;\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 3;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 10;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 15;\n  return [a, b, c];\n}\n// clang-format on\n\n// Utils\n\nenum Endian {\n  Little,\n  Big,\n}\n\nfunction add32(a: number, b: number): number {\n  return add32to64(a, b)[1];\n}\n\nfunction add32to64(a: number, b: number): [number, number] {\n  const low = (a & 0xffff) + (b & 0xffff);\n  const high = (a >>> 16) + (b >>> 16) + (low >>> 16);\n  return [high >>> 16, (high << 16) | (low & 0xffff)];\n}\n\nfunction add64(a: [number, number], b: [number, number]): [number, number] {\n  const ah = a[0], al = a[1];\n  const bh = b[0], bl = b[1];\n  const result = add32to64(al, bl);\n  const carry = result[0];\n  const l = result[1];\n  const h = add32(add32(ah, bh), carry);\n  return [h, l];\n}\n\nfunction sub32(a: number, b: number): number {\n  const low = (a & 0xffff) - (b & 0xffff);\n  const high = (a >> 16) - (b >> 16) + (low >> 16);\n  return (high << 16) | (low & 0xffff);\n}\n\n// Rotate a 32b number left `count` position\nfunction rol32(a: number, count: number): number {\n  return (a << count) | (a >>> (32 - count));\n}\n\n// Rotate a 64b number left `count` position\nfunction rol64(num: [number, number], count: number): [number, number] {\n  const hi = num[0], lo = num[1];\n  const h = (hi << count) | (lo >>> (32 - count));\n  const l = (lo << count) | (hi >>> (32 - count));\n  return [h, l];\n}\n\nfunction bytesToWords32(bytes: Byte[], endian: Endian): number[] {\n  const size = (bytes.length + 3) >>> 2;\n  const words32 = [];\n\n  for (let i = 0; i < size; i++) {\n    words32[i] = wordAt(bytes, i * 4, endian);\n  }\n\n  return words32;\n}\n\nfunction byteAt(bytes: Byte[], index: number): Byte {\n  return index >= bytes.length ? 0 : bytes[index];\n}\n\nfunction wordAt(bytes: Byte[], index: number, endian: Endian): number {\n  let word = 0;\n  if (endian === Endian.Big) {\n    for (let i = 0; i < 4; i++) {\n      word += byteAt(bytes, index + i) << (24 - 8 * i);\n    }\n  } else {\n    for (let i = 0; i < 4; i++) {\n      word += byteAt(bytes, index + i) << 8 * i;\n    }\n  }\n  return word;\n}\n\nfunction words32ToByteString(words32: number[]): Byte[] {\n  return words32.reduce((bytes, word) => bytes.concat(word32ToByteString(word)), [] as Byte[]);\n}\n\nfunction word32ToByteString(word: number): Byte[] {\n  let bytes: Byte[] = [];\n  for (let i = 0; i < 4; i++) {\n    bytes.push((word >>> 8 * (3 - i)) & 0xff);\n  }\n  return bytes;\n}\n\nfunction bytesToHexString(bytes: Byte[]): string {\n  let hex: string = '';\n  for (let i = 0; i < bytes.length; i++) {\n    const b = byteAt(bytes, i);\n    hex += (b >>> 4).toString(16) + (b & 0x0f).toString(16);\n  }\n  return hex.toLowerCase();\n}\n\n/**\n * Create a shared exponentiation pool for base-256 computations. This shared pool provides memoized\n * power-of-256 results with memoized power-of-two computations for efficient multiplication.\n *\n * For our purposes, this can be safely stored as a global without memory concerns. The reason is\n * that we encode two words, so only need the 0th (for the low word) and 4th (for the high word)\n * exponent.\n */\nconst base256 = new BigIntExponentiation(256);\n\n/**\n * Represents two 32-bit words as a single decimal number. This requires a big integer storage\n * model as JS numbers are not accurate enough to represent the 64-bit number.\n *\n * Based on https://www.danvk.org/hex2dec.html\n */\nfunction wordsToDecimalString(hi: number, lo: number): string {\n  // Encode the four bytes in lo in the lower digits of the decimal number.\n  // Note: the multiplication results in lo itself but represented by a big integer using its\n  // decimal digits.\n  const decimal = base256.toThePowerOf(0).multiplyBy(lo);\n\n  // Encode the four bytes in hi above the four lo bytes. lo is a maximum of (2^8)^4, which is why\n  // this multiplication factor is applied.\n  base256.toThePowerOf(4).multiplyByAndAddTo(hi, decimal);\n\n  return decimal.toString();\n}\n"]}