111 lines
8.5 KiB
HTML
111 lines
8.5 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title>JSDoc: Source: crypto/public_key/elgamal.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/public_key/elgamal.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
|
|
//
|
|
// ElGamal implementation
|
|
|
|
/**
|
|
* @requires crypto/public_key/jsbn
|
|
* @requires crypto/random
|
|
* @requires util
|
|
* @module crypto/public_key/elgamal
|
|
*/
|
|
|
|
var BigInteger = require('./jsbn.js'),
|
|
random = require('../random.js'),
|
|
util = require('../../util');
|
|
|
|
function Elgamal() {
|
|
|
|
function encrypt(m, g, p, y) {
|
|
// choose k in {2,...,p-2}
|
|
var two = BigInteger.ONE.add(BigInteger.ONE);
|
|
var pMinus2 = p.subtract(two);
|
|
var k = random.getRandomBigIntegerInRange(two, pMinus2);
|
|
k = k.mod(pMinus2).add(BigInteger.ONE);
|
|
var c = [];
|
|
c[0] = g.modPow(k, p);
|
|
c[1] = y.modPow(k, p).multiply(m).mod(p);
|
|
return c;
|
|
}
|
|
|
|
function decrypt(c1, c2, p, x) {
|
|
util.print_debug("Elgamal Decrypt:\nc1:" + util.hexstrdump(c1.toMPI()) + "\n" +
|
|
"c2:" + util.hexstrdump(c2.toMPI()) + "\n" +
|
|
"p:" + util.hexstrdump(p.toMPI()) + "\n" +
|
|
"x:" + util.hexstrdump(x.toMPI()));
|
|
return (c1.modPow(x, p).modInverse(p)).multiply(c2).mod(p);
|
|
//var c = c1.pow(x).modInverse(p); // c0^-a mod p
|
|
//return c.multiply(c2).mod(p);
|
|
}
|
|
|
|
// signing and signature verification using Elgamal is not required by OpenPGP.
|
|
this.encrypt = encrypt;
|
|
this.decrypt = decrypt;
|
|
}
|
|
|
|
module.exports = Elgamal;
|
|
</code></pre>
|
|
</article>
|
|
</section>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<nav>
|
|
<h2><a href="index.html">Index</a></h2><h3>Modules</h3><ul><li><a href="module-armor.html">armor</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-keyid.html">keyid</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-mpi.html">mpi</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="module-s2k.html">s2k</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><li><a href="util.html">util/util</a></li></ul><h3>Classes</h3><ul><li><a href="JXG.Util.html">JXG.Util</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 3.2.0</a> on Mon Jan 06 2014 19:29:27 GMT+0100 (MEZ)
|
|
</footer>
|
|
|
|
<script> prettyPrint(); </script>
|
|
<script src="scripts/linenumber.js"> </script>
|
|
</body>
|
|
</html>
|