62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
var assert = require('nanoassert')
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const {
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crypto_stream_chacha20_ietf,
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crypto_stream_chacha20_ietf_KEYBYTES,
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crypto_stream_chacha20_ietf_NONCEBYTES
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} = require('./crypto_stream_chacha20')
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const randombytes_SEEDBYTES = 32
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var randombytes = (function () {
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var QUOTA = 65536 // limit for QuotaExceededException
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var crypto = typeof global !== 'undefined' ? crypto = (global.crypto || global.msCrypto) : null
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function browserBytes (out, n) {
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for (var i = 0; i < n; i += QUOTA) {
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crypto.getRandomValues(out.subarray(i, i + Math.min(n - i, QUOTA)))
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}
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}
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function nodeBytes (out, n) {
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out.set(crypto.randomBytes(n))
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}
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function noImpl () {
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throw new Error('No secure random number generator available')
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}
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if (crypto && crypto.getRandomValues) {
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return browserBytes
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} else if (typeof require !== 'undefined') {
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// Node.js.
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crypto = require('crypto')
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if (crypto && crypto.randomBytes) {
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return nodeBytes
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}
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}
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return noImpl
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})()
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Object.defineProperty(module.exports, 'randombytes', {
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value: randombytes
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})
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function randombytes_buf (out) {
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assert(out, 'out must be given')
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randombytes(out, out.length)
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}
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function randombytes_buf_deterministic (buf, seed) {
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const nonce = Buffer.alloc(crypto_stream_chacha20_ietf_NONCEBYTES)
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nonce.write('LibsodiumDRG')
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assert(randombytes_SEEDBYTES === crypto_stream_chacha20_ietf_KEYBYTES)
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crypto_stream_chacha20_ietf(buf, nonce, seed)
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}
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module.exports = {
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randombytes_buf,
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randombytes_buf_deterministic,
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randombytes_SEEDBYTES
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} |