240 lines
12 KiB
HTML
240 lines
12 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title>JSDoc: Source: crypto/random.js</title>
|
|
|
|
<script src="scripts/prettify/prettify.js"> </script>
|
|
<script src="scripts/prettify/lang-css.js"> </script>
|
|
<!--[if lt IE 9]>
|
|
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
|
|
<![endif]-->
|
|
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
|
|
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div id="main">
|
|
|
|
<h1 class="page-title">Source: crypto/random.js</h1>
|
|
|
|
|
|
|
|
|
|
|
|
<section>
|
|
<article>
|
|
<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
|
|
// Copyright (C) 2011 Recurity Labs GmbH
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Lesser General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2.1 of the License, or (at your option) any later version.
|
|
//
|
|
// This library 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
|
|
// Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public
|
|
// License along with this library; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
// The GPG4Browsers crypto interface
|
|
|
|
/**
|
|
* @requires type/mpi
|
|
* @module crypto/random
|
|
*/
|
|
|
|
var type_mpi = require('../type/mpi.js');
|
|
var nodeCrypto = null;
|
|
|
|
if (typeof window === 'undefined') {
|
|
nodeCrypto = require('crypto');
|
|
}
|
|
|
|
module.exports = {
|
|
/**
|
|
* Retrieve secure random byte string of the specified length
|
|
* @param {Integer} length Length in bytes to generate
|
|
* @return {String} Random byte string
|
|
*/
|
|
getRandomBytes: function(length) {
|
|
var result = '';
|
|
for (var i = 0; i < length; i++) {
|
|
result += String.fromCharCode(this.getSecureRandomOctet());
|
|
}
|
|
return result;
|
|
},
|
|
|
|
/**
|
|
* Return a pseudo-random number in the specified range
|
|
* @param {Integer} from Min of the random number
|
|
* @param {Integer} to Max of the random number (max 32bit)
|
|
* @return {Integer} A pseudo random number
|
|
*/
|
|
getPseudoRandom: function(from, to) {
|
|
return Math.round(Math.random() * (to - from)) + from;
|
|
},
|
|
|
|
/**
|
|
* Return a secure random number in the specified range
|
|
* @param {Integer} from Min of the random number
|
|
* @param {Integer} to Max of the random number (max 32bit)
|
|
* @return {Integer} A secure random number
|
|
*/
|
|
getSecureRandom: function(from, to) {
|
|
var randUint = this.getSecureRandomUint();
|
|
var bits = ((to - from)).toString(2).length;
|
|
while ((randUint & (Math.pow(2, bits) - 1)) > (to - from)) {
|
|
randUint = this.getSecureRandomUint();
|
|
}
|
|
return from + (Math.abs(randUint & (Math.pow(2, bits) - 1)));
|
|
},
|
|
|
|
getSecureRandomOctet: function() {
|
|
var buf = new Uint8Array(1);
|
|
this.getRandomValues(buf);
|
|
return buf[0];
|
|
},
|
|
|
|
getSecureRandomUint: function() {
|
|
var buf = new Uint8Array(4);
|
|
var dv = new DataView(buf.buffer);
|
|
this.getRandomValues(buf);
|
|
return dv.getUint32(0);
|
|
},
|
|
|
|
/**
|
|
* Helper routine which calls platform specific crypto random generator
|
|
* @param {Uint8Array} buf
|
|
*/
|
|
getRandomValues: function(buf) {
|
|
if (typeof window !== 'undefined' && window.crypto) {
|
|
window.crypto.getRandomValues(buf);
|
|
} else if (nodeCrypto) {
|
|
var bytes = nodeCrypto.randomBytes(buf.length);
|
|
buf.set(bytes);
|
|
} else if (this.randomBuffer.buffer) {
|
|
this.randomBuffer.get(buf);
|
|
} else {
|
|
throw new Error('No secure random number generator available.');
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Create a secure random big integer of bits length
|
|
* @param {Integer} bits Bit length of the MPI to create
|
|
* @return {BigInteger} Resulting big integer
|
|
*/
|
|
getRandomBigInteger: function(bits) {
|
|
if (bits < 0) {
|
|
return null;
|
|
}
|
|
var numBytes = Math.floor((bits + 7) / 8);
|
|
|
|
var randomBits = this.getRandomBytes(numBytes);
|
|
if (bits % 8 > 0) {
|
|
|
|
randomBits = String.fromCharCode(
|
|
(Math.pow(2, bits % 8) - 1) &
|
|
randomBits.charCodeAt(0)) +
|
|
randomBits.substring(1);
|
|
}
|
|
var mpi = new type_mpi();
|
|
mpi.fromBytes(randomBits);
|
|
return mpi.toBigInteger();
|
|
},
|
|
|
|
getRandomBigIntegerInRange: function(min, max) {
|
|
if (max.compareTo(min) <= 0) {
|
|
return;
|
|
}
|
|
|
|
var range = max.subtract(min);
|
|
var r = this.getRandomBigInteger(range.bitLength());
|
|
while (r > range) {
|
|
r = this.getRandomBigInteger(range.bitLength());
|
|
}
|
|
return min.add(r);
|
|
},
|
|
|
|
randomBuffer: new RandomBuffer()
|
|
|
|
};
|
|
|
|
/**
|
|
* Buffer for secure random numbers
|
|
*/
|
|
function RandomBuffer() {
|
|
this.buffer = null;
|
|
this.size = null;
|
|
}
|
|
|
|
/**
|
|
* Initialize buffer
|
|
* @param {Integer} size size of buffer
|
|
*/
|
|
RandomBuffer.prototype.init = function(size) {
|
|
this.buffer = new Uint32Array(size);
|
|
this.size = 0;
|
|
};
|
|
|
|
/**
|
|
* Concat array of secure random numbers to buffer
|
|
* @param {Uint32Array} buf
|
|
*/
|
|
RandomBuffer.prototype.set = function(buf) {
|
|
if (!this.buffer) {
|
|
throw new Error('RandomBuffer is not initialized');
|
|
}
|
|
var freeSpace = this.buffer.length - this.size;
|
|
if (buf.length > freeSpace) {
|
|
buf = buf.subarray(0, freeSpace);
|
|
}
|
|
this.buffer.set(buf, this.size);
|
|
this.size += buf.length;
|
|
};
|
|
|
|
/**
|
|
* Take numbers out of buffer and copy to array
|
|
* @param {Uint32Array} buf the destination array
|
|
*/
|
|
RandomBuffer.prototype.get = function(buf) {
|
|
if (!this.buffer) {
|
|
throw new Error('RandomBuffer is not initialized');
|
|
}
|
|
if (this.size < buf.length) {
|
|
throw new Error('Random number buffer depleted.')
|
|
}
|
|
for (var i = 0; i < buf.length; i++) {
|
|
buf[i] = this.buffer[--this.size];
|
|
}
|
|
};
|
|
</code></pre>
|
|
</article>
|
|
</section>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<nav>
|
|
<h2><a href="index.html">Index</a></h2><h3>Modules</h3><ul><li><a href="module-async_proxy.html">async_proxy</a></li><li><a href="module-cleartext.html">cleartext</a></li><li><a href="module-config.html">config</a></li><li><a href="config.html">config/config</a></li><li><a href="localStorage.html">config/localStorage</a></li><li><a href="module-crypto.html">crypto</a></li><li><a href="cfb.html">crypto/cfb</a></li><li><a href="cipher.html">crypto/cipher</a></li><li><a href="aes.html">crypto/cipher/aes</a></li><li><a href="blowfish.html">crypto/cipher/blowfish</a></li><li><a href="cast5.html">crypto/cipher/cast5</a></li><li><a href="des.html">crypto/cipher/des</a></li><li><a href="twofish.html">crypto/cipher/twofish</a></li><li><a href="crypto.html">crypto/crypto</a></li><li><a href="hash.html">crypto/hash</a></li><li><a href="md5.html">crypto/hash/md5</a></li><li><a href="ripe-md.html">crypto/hash/ripe-md</a></li><li><a href="sha.html">crypto/hash/sha</a></li><li><a href="pkcs1.html">crypto/pkcs1</a></li><li><a href="public_key.html">crypto/public_key</a></li><li><a href="dsa.html">crypto/public_key/dsa</a></li><li><a href="elgamal.html">crypto/public_key/elgamal</a></li><li><a href="jsbn.html">crypto/public_key/jsbn</a></li><li><a href="rsa.html">crypto/public_key/rsa</a></li><li><a href="random.html">crypto/random</a></li><li><a href="signature.html">crypto/signature</a></li><li><a href="armor.html">encoding/armor</a></li><li><a href="base64.html">encoding/base64</a></li><li><a href="module-enums.html">enums</a></li><li><a href="module-key.html">key</a></li><li><a href="module-keyring.html">keyring</a></li><li><a href="keyring.html">keyring/keyring</a></li><li><a href="localstore.html">keyring/localstore</a></li><li><a href="module-message.html">message</a></li><li><a href="module-openpgp.html">openpgp</a></li><li><a href="module-packet.html">packet</a></li><li><a href="compressed.html">packet/compressed</a></li><li><a href="literal.html">packet/literal</a></li><li><a href="marker.html">packet/marker</a></li><li><a href="one_pass_signature.html">packet/one_pass_signature</a></li><li><a href="packet.html">packet/packet</a></li><li><a href="packetlist.html">packet/packetlist</a></li><li><a href="public_key_.html">packet/public_key</a></li><li><a href="public_key_encrypted_session_key.html">packet/public_key_encrypted_session_key</a></li><li><a href="public_subkey.html">packet/public_subkey</a></li><li><a href="secret_key.html">packet/secret_key</a></li><li><a href="secret_subkey.html">packet/secret_subkey</a></li><li><a href="signature_.html">packet/signature</a></li><li><a href="sym_encrypted_integrity_protected.html">packet/sym_encrypted_integrity_protected</a></li><li><a href="sym_encrypted_session_key.html">packet/sym_encrypted_session_key</a></li><li><a href="symmetrically_encrypted.html">packet/symmetrically_encrypted</a></li><li><a href="trust.html">packet/trust</a></li><li><a href="user_attribute.html">packet/user_attribute</a></li><li><a href="userid.html">packet/userid</a></li><li><a href="keyid.html">type/keyid</a></li><li><a href="mpi.html">type/mpi</a></li><li><a href="s2k.html">type/s2k</a></li><li><a href="module-util.html">util</a></li></ul><h3>Classes</h3><ul><li><a href="JXG.Util.html">JXG.Util</a></li><li><a href="module-async_proxy-AsyncProxy.html">async_proxy~AsyncProxy</a></li><li><a href="module-cleartext-CleartextMessage.html">cleartext~CleartextMessage</a></li><li><a href="localStorage-LocalStorage.html">config/localStorage~LocalStorage</a></li><li><a href="keyring-Keyring.html">keyring/keyring~Keyring</a></li><li><a href="module-key-Key.html">key~Key</a></li><li><a href="module-key-SubKey.html">key~SubKey</a></li><li><a href="module-key-User.html">key~User</a></li><li><a href="module-message-Message.html">message~Message</a></li><li><a href="compressed-Compressed.html">packet/compressed~Compressed</a></li><li><a href="literal-Literal.html">packet/literal~Literal</a></li><li><a href="marker-Marker.html">packet/marker~Marker</a></li><li><a href="one_pass_signature-OnePassSignature.html">packet/one_pass_signature~OnePassSignature</a></li><li><a href="packetlist-Packetlist.html">packet/packetlist~Packetlist</a></li><li><a href="public_key_encrypted_session_key-PublicKeyEncryptedSessionKey.html">packet/public_key_encrypted_session_key~PublicKeyEncryptedSessionKey</a></li><li><a href="public_key-PublicKey.html">packet/public_key~PublicKey</a></li><li><a href="public_subkey-PublicSubkey.html">packet/public_subkey~PublicSubkey</a></li><li><a href="secret_key-SecretKey.html">packet/secret_key~SecretKey</a></li><li><a href="secret_subkey-SecretSubkey.html">packet/secret_subkey~SecretSubkey</a></li><li><a href="signature-Signature.html">packet/signature~Signature</a></li><li><a href="sym_encrypted_integrity_protected-SymEncryptedIntegrityProtected.html">packet/sym_encrypted_integrity_protected~SymEncryptedIntegrityProtected</a></li><li><a href="sym_encrypted_session_key-SymEncryptedSessionKey.html">packet/sym_encrypted_session_key~SymEncryptedSessionKey</a></li><li><a href="symmetrically_encrypted-SymmetricallyEncrypted.html">packet/symmetrically_encrypted~SymmetricallyEncrypted</a></li><li><a href="trust-Trust.html">packet/trust~Trust</a></li><li><a href="user_attribute-UserAttribute.html">packet/user_attribute~UserAttribute</a></li><li><a href="userid-Userid.html">packet/userid~Userid</a></li><li><a href="keyid-Keyid.html">type/keyid~Keyid</a></li><li><a href="mpi-MPI.html">type/mpi~MPI</a></li><li><a href="s2k-S2K.html">type/s2k~S2K</a></li></ul>
|
|
</nav>
|
|
|
|
<br clear="both">
|
|
|
|
<footer>
|
|
Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.2</a> on Wed Feb 12 2014 15:09:01 GMT+0100 (MEZ)
|
|
</footer>
|
|
|
|
<script> prettyPrint(); </script>
|
|
<script src="scripts/linenumber.js"> </script>
|
|
</body>
|
|
</html>
|