sodium-javascript/randombytes.js
2017-06-19 22:34:12 +02:00

41 lines
1000 B
JavaScript

var assert = require('nanoassert')
var randombytes = (function () {
var QUOTA = 65536 // limit for QuotaExceededException
var crypto = typeof window !== 'undefined' ? (window.crypto || window.msCrypto) : null
function windowBytes (out, n) {
for (var i = 0; i < n; i += QUOTA) {
crypto.getRandomValues(out.subarray(i, i + Math.min(n - i, QUOTA)))
}
}
function nodeBytes (out, n) {
out.set(crypto.randomBytes(n))
}
function noImpl () {
throw new Error('No secure random number generator available')
}
if (crypto && crypto.getRandomValues) {
return windowBytes
} else if (typeof require !== 'undefined') {
// Node.js.
crypto = require('cry' + 'pto');
if (crypto && crypto.randomBytes) {
return nodeBytes
}
}
return noImpl
})()
Object.defineProperty(module.exports, 'randombytes', {
value: randombytes
})
module.exports.randombytes_buf = function (out) {
assert(out, 'out must be given')
randombytes(out, out.length)
}