| 'use strict' |
| |
| function oldBrowser () { |
| throw new Error('Secure random number generation is not supported by this browser.\nUse Chrome, Firefox or Internet Explorer 11') |
| } |
| |
| var Buffer = require('safe-buffer').Buffer |
| var crypto = global.crypto || global.msCrypto |
| |
| if (crypto && crypto.getRandomValues) { |
| module.exports = randomBytes |
| } else { |
| module.exports = oldBrowser |
| } |
| |
| function randomBytes (size, cb) { |
| // phantomjs needs to throw |
| if (size > 65536) throw new Error('requested too many random bytes') |
| // in case browserify isn't using the Uint8Array version |
| var rawBytes = new global.Uint8Array(size) |
| |
| // This will not work in older browsers. |
| // See https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues |
| if (size > 0) { // getRandomValues fails on IE if size == 0 |
| crypto.getRandomValues(rawBytes) |
| } |
| |
| // XXX: phantomjs doesn't like a buffer being passed here |
| var bytes = Buffer.from(rawBytes.buffer) |
| |
| if (typeof cb === 'function') { |
| return process.nextTick(function () { |
| cb(null, bytes) |
| }) |
| } |
| |
| return bytes |
| } |