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<h1 class="page-title">Source: packet/openpgp.packet.encrypteddata.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
/**
* @class
* @classdesc Implementation of the Symmetrically Encrypted Data Packet (Tag 9)
*
* 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).
*/
function openpgp_packet_encrypteddata() {
this.tagType = 9;
this.packetLength = null;
this.encryptedData = null;
this.decryptedData = null;
/**
* Parsing function for the packet.
*
* @param {String} input Payload of a tag 9 packet
* @param {Integer} position Position to start reading from the input string
* @param {Integer} len Length of the packet or the remaining length of
* input at position
* @return {openpgp_packet_encrypteddata} Object representation
*/
function read_packet(input, position, len) {
var mypos = position;
this.packetLength = len;
// - Encrypted data, the output of the selected symmetric-key cipher
// operating in OpenPGP's variant of Cipher Feedback (CFB) mode.
this.encryptedData = input.substring(position, position + len);
return this;
}
/**
* Symmetrically decrypt the packet data
*
* @param {Integer} symmetric_algorithm_type
* Symmetric key algorithm to use // See RFC4880 9.2
* @param {String} key
* Key as string with the corresponding length to the
* algorithm
* @return The decrypted data;
*/
function decrypt_sym(symmetric_algorithm_type, key) {
this.decryptedData = openpgp_crypto_symmetricDecrypt(
symmetric_algorithm_type, key, this.encryptedData, true);
util.print_debug("openpgp.packet.encryptedintegrityprotecteddata.js\n"+
"data: "+util.hexstrdump(this.decryptedData));
return this.decryptedData;
}
/**
* Creates a string representation of the packet
*
* @param {Integer} algo Symmetric key algorithm to use // See RFC4880 9.2
* @param {String} key Key as string with the corresponding length to the
* algorithm
* @param {String} data Data to be
* @return {String} String-representation of the packet
*/
function write_packet(algo, key, data) {
var result = "";
result += openpgp_crypto_symmetricEncrypt(
openpgp_crypto_getPrefixRandom(algo), algo, key, data, true);
result = openpgp_packet.write_packet_header(9, result.length) + result;
return result;
}
function toString() {
return '5.7. Symmetrically Encrypted Data Packet (Tag 9)\n'
+ ' length: ' + this.packetLength + '\n'
+ ' Used symmetric algorithm: ' + this.algorithmType + '\n'
+ ' encrypted data: Bytes ['
+ util.hexstrdump(this.encryptedData) + ']\n';
}
this.decrypt_sym = decrypt_sym;
this.toString = toString;
this.read_packet = read_packet;
this.write_packet = write_packet;
};
</code></pre>
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