45 lines
879 B
JavaScript
45 lines
879 B
JavaScript
/*!
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* random.js - randomness for bcoin
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* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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/**
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* @module crypto.random
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*/
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var crypto = require('crypto');
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/*
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* Misc
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*/
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exports.randomBytes = crypto.randomBytes;
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/**
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* Generate a random uint32.
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* Probably more cryptographically sound than
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* `Math.random()`.
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* @returns {Number}
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*/
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exports.randomInt = function randomInt() {
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return exports.randomBytes(4).readUInt32LE(0, true);
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};
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/**
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* Generate a random number within a range.
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* Probably more cryptographically sound than
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* `Math.random()`.
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* @param {Number} min - Inclusive.
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* @param {Number} max - Exclusive.
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* @returns {Number}
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*/
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exports.randomRange = function randomRange(min, max) {
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var num = exports.randomInt();
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return Math.floor((num / 0x100000000) * (max - min) + min);
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};
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