160 lines
9.8 KiB
HTML
160 lines
9.8 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<title>JSDoc: Source: crypto/random.js</title>
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<h1 class="page-title">Source: crypto/random.js</h1>
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<section>
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<article>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// The GPG4Browsers crypto interface
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/**
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* @requires type/mpi
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* @module crypto/random
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*/
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var type_mpi = require('../type/mpi.js');
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module.exports = {
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/**
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* Retrieve secure random byte string of the specified length
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* @param {Integer} length Length in bytes to generate
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* @return {String} Random byte string
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*/
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getRandomBytes: function(length) {
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var result = '';
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for (var i = 0; i < length; i++) {
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result += String.fromCharCode(this.getSecureRandomOctet());
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}
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return result;
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},
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/**
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* Return a pseudo-random number in the specified range
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* @param {Integer} from Min of the random number
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* @param {Integer} to Max of the random number (max 32bit)
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* @return {Integer} A pseudo random number
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*/
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getPseudoRandom: function(from, to) {
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return Math.round(Math.random() * (to - from)) + from;
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},
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/**
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* Return a secure random number in the specified range
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* @param {Integer} from Min of the random number
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* @param {Integer} to Max of the random number (max 32bit)
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* @return {Integer} A secure random number
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*/
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getSecureRandom: function(from, to) {
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var buf = new Uint32Array(1);
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window.crypto.getRandomValues(buf);
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var bits = ((to - from)).toString(2).length;
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while ((buf[0] & (Math.pow(2, bits) - 1)) > (to - from))
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window.crypto.getRandomValues(buf);
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return from + (Math.abs(buf[0] & (Math.pow(2, bits) - 1)));
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},
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getSecureRandomOctet: function() {
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var buf = new Uint32Array(1);
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window.crypto.getRandomValues(buf);
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return buf[0] & 0xFF;
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},
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/**
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* Create a secure random big integer of bits length
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* @param {Integer} bits Bit length of the MPI to create
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* @return {BigInteger} Resulting big integer
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*/
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getRandomBigInteger: function(bits) {
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if (bits < 0) {
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return null;
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}
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var numBytes = Math.floor((bits + 7) / 8);
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var randomBits = this.getRandomBytes(numBytes);
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if (bits % 8 > 0) {
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randomBits = String.fromCharCode(
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(Math.pow(2, bits % 8) - 1) &
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randomBits.charCodeAt(0)) +
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randomBits.substring(1);
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}
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var mpi = new type_mpi();
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mpi.fromBytes(randomBits);
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return mpi.toBigInteger();
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},
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getRandomBigIntegerInRange: function(min, max) {
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if (max.compareTo(min) <= 0) {
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return;
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}
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var range = max.subtract(min);
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var r = this.getRandomBigInteger(range.bitLength());
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while (r > range) {
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r = this.getRandomBigInteger(range.bitLength());
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}
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return min.add(r);
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}
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};
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</code></pre>
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</article>
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</section>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0</a> on Sun Jan 05 2014 23:07:43 GMT-0800 (PST)
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