proteus-hd/src/proteus/util/RandomUtil.js

Signal Protocol (with header encryption) implementation for JavaScript. Based on Proteus.js.

/*
 * Wire
 * Copyright (C) 2016 Wire Swiss GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/.
 *
 */

'use strict';

/** @module util */

let crypto = (typeof window !== 'undefined') && (window.crypto || window.msCrypto);
let random_bytes;

if (crypto) {
  // browser
  random_bytes = (len) => {
    const buffer = new ArrayBuffer(len);
    const buffer_view = new Uint8Array(buffer);
    return crypto.getRandomValues(buffer_view);
  };
} else {
  // node
  crypto = require('crypto');
  random_bytes = (len) => {
    return new Uint8Array(crypto.randomBytes(len));
  };
}

module.exports = { random_bytes };