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<h1 class="page-title">Source: packet/symmetrically_encrypted.js</h1>
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<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
/**
* Implementation of the Symmetrically Encrypted Data Packet (Tag 9)<br/>
* <br/>
* RFC4880 5.7: The Symmetrically Encrypted Data packet contains data encrypted
* with a symmetric-key algorithm. When it has been decrypted, it contains other
* packets (usually a literal data packet or compressed data packet, but in
* theory other Symmetrically Encrypted Data packets or sequences of packets
* that form whole OpenPGP messages).
* @requires crypto
* @module packet/symmetrically_encrypted
*/
var crypto = require('../crypto');
/**
* @constructor
*/
module.exports = function () {
this.encrypted = null;
/** Decrypted packets contained within.
* @type {module:packet/packetlist} */
this.packets = null;
this.read = function(bytes) {
this.encrypted = bytes;
};
this.write = function() {
return this.encrypted;
};
/**
* Symmetrically decrypt the packet data
*
* @param {Integer} sessionKeyAlgorithm
* Symmetric key algorithm to use // See RFC4880 9.2
* @param {String} key
* Key as string with the corresponding length to the
* algorithm
*/
this.decrypt = function(sessionKeyAlgorithm, key) {
var decrypted = crypto.cfb.decrypt(
sessionKeyAlgorithm, key, this.encrypted, true);
this.packets.read(decrypted);
};
this.encrypt = function(algo, key) {
var data = this.packets.write();
this.encrypted = crypto.cfb.encrypt(
crypto.getPrefixRandom(algo), algo, data, key, true);
};
};
</code></pre>
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