37 lines
1.0 KiB
JavaScript
37 lines
1.0 KiB
JavaScript
|
'use strict'
|
||
|
|
|
||
|
|
function oldBrowser () {
|
||
|
|
throw new Error('secure random number generation not supported by this browser\nuse chrome, FireFox or Internet Explorer 11')
|
||
|
|
}
|
||
|
|
|
||
|
|
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)
|
||
|
|
}
|
||
|
|
// phantomjs doesn't like a buffer being passed here
|
||
|
|
var bytes = new Buffer(rawBytes.buffer)
|
||
|
|
|
||
|
|
if (typeof cb === 'function') {
|
||
|
|
return process.nextTick(function () {
|
||
|
|
cb(null, bytes)
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
return bytes
|
||
|
|
}
|