source: trip-planner-front/node_modules/randombytes/browser.js@ 6c1585f

Last change on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.5 KB
Line 
1'use strict'
2
3// limit of Crypto.getRandomValues()
4// https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues
5var MAX_BYTES = 65536
6
7// Node supports requesting up to this number of bytes
8// https://github.com/nodejs/node/blob/master/lib/internal/crypto/random.js#L48
9var MAX_UINT32 = 4294967295
10
11function oldBrowser () {
12 throw new Error('Secure random number generation is not supported by this browser.\nUse Chrome, Firefox or Internet Explorer 11')
13}
14
15var Buffer = require('safe-buffer').Buffer
16var crypto = global.crypto || global.msCrypto
17
18if (crypto && crypto.getRandomValues) {
19 module.exports = randomBytes
20} else {
21 module.exports = oldBrowser
22}
23
24function randomBytes (size, cb) {
25 // phantomjs needs to throw
26 if (size > MAX_UINT32) throw new RangeError('requested too many random bytes')
27
28 var bytes = Buffer.allocUnsafe(size)
29
30 if (size > 0) { // getRandomValues fails on IE if size == 0
31 if (size > MAX_BYTES) { // this is the max bytes crypto.getRandomValues
32 // can do at once see https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues
33 for (var generated = 0; generated < size; generated += MAX_BYTES) {
34 // buffer.slice automatically checks if the end is past the end of
35 // the buffer so we don't have to here
36 crypto.getRandomValues(bytes.slice(generated, generated + MAX_BYTES))
37 }
38 } else {
39 crypto.getRandomValues(bytes)
40 }
41 }
42
43 if (typeof cb === 'function') {
44 return process.nextTick(function () {
45 cb(null, bytes)
46 })
47 }
48
49 return bytes
50}
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