72 lines
1.5 KiB
JavaScript
72 lines
1.5 KiB
JavaScript
/*!
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* random.js - pseudorandom byte generation for bcoin.
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* Copyright (c) 2016, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*
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* Parts of this software are based on brorand:
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* https://github.com/indutny/brorand
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* Copyright (c) 2014, Fedor Indutny (MIT License).
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*/
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/* jshint worker: true */
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var random, crypto, global;
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try {
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crypto = require('crypto');
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} catch (e) {
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;
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}
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if (crypto) {
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random = function random(n) {
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return crypto.randomBytes(n);
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};
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} else {
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if (typeof window !== 'undefined')
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global = window;
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else if (typeof self !== 'undefined')
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global = self;
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if (!global)
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throw new Error('Unknown global.');
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crypto = global.crypto || global.msCrypto;
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if (crypto && crypto.getRandomValues) {
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random = function random(n) {
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var data = new Uint8Array(n);
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crypto.getRandomValues(data);
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return new Buffer(data.buffer);
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};
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} else {
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// Out of luck here. Use bad randomness for now.
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// Possibly fall back to randy in the future:
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// https://github.com/deestan/randy
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random = function random(n) {
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var data = new Buffer(n);
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var i;
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for (i = 0; i < data.length; i++)
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data[i] = Math.floor(Math.random() * 256);
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return data;
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};
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}
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}
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function randomInt(min, max) {
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var num = random(4).readUInt32LE(0, true);
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return Math.floor((num / 0x100000000) * (max - min) + min);
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}
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/*
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* Expose
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*/
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exports = random;
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exports.randomBytes = random;
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exports.randomInt = randomInt;
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module.exports = random;
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