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add randombytes_buf_deterministic

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This commit is contained in:
Christophe Diederichs 2022-11-21 17:17:47 +00:00
parent ee481d0096
commit facf602fdc
1 changed files with 23 additions and 1 deletions
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24
randombytes.js
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@ -1,4 +1,12 @@
var assert = require('nanoassert')
const {
crypto_stream_chacha20_ietf,
crypto_stream_chacha20_ietf_KEYBYTES,
crypto_stream_chacha20_ietf_NONCEBYTES
} = require('./crypto_stream_chacha20')
const randombytes_SEEDBYTES = 32
var randombytes = (function () {
var QUOTA = 65536 // limit for QuotaExceededException
var crypto = typeof global !== 'undefined' ? crypto = (global.crypto || global.msCrypto) : null
@ -34,7 +42,21 @@ Object.defineProperty(module.exports, 'randombytes', {
value: randombytes
})
module.exports.randombytes_buf = function (out) {
function randombytes_buf (out) {
assert(out, 'out must be given')
randombytes(out, out.length)
}
function randombytes_buf_deterministic (buf, seed) {
const nonce = Buffer.alloc(crypto_stream_chacha20_ietf_NONCEBYTES)
nonce.write('LibsodiumDRG')
assert(randombytes_SEEDBYTES === crypto_stream_chacha20_ietf_KEYBYTES)
crypto_stream_chacha20_ietf(buf, nonce, seed)
}
module.exports = {
randombytes_buf,
randombytes_buf_deterministic,
randombytes_SEEDBYTES
}