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