149 lines
10 KiB
HTML
149 lines
10 KiB
HTML
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<title>JSDoc: Source: packet/openpgp.packet.encrypteddata.js</title>
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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
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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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/**
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* @class
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* @classdesc Implementation of the Symmetrically Encrypted Data Packet (Tag 9)
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*
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* RFC4880 5.7: The Symmetrically Encrypted Data packet contains data encrypted
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* with a symmetric-key algorithm. When it has been decrypted, it contains other
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* packets (usually a literal data packet or compressed data packet, but in
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* theory other Symmetrically Encrypted Data packets or sequences of packets
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* that form whole OpenPGP messages).
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*/
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function openpgp_packet_encrypteddata() {
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this.tagType = 9;
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this.packetLength = null;
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this.encryptedData = null;
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this.decryptedData = null;
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/**
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* Parsing function for the packet.
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*
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* @param {String} input Payload of a tag 9 packet
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* @param {Integer} position Position to start reading from the input string
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* @param {Integer} len Length of the packet or the remaining length of
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* input at position
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* @return {openpgp_packet_encrypteddata} Object representation
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*/
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function read_packet(input, position, len) {
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var mypos = position;
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this.packetLength = len;
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// - Encrypted data, the output of the selected symmetric-key cipher
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// operating in OpenPGP's variant of Cipher Feedback (CFB) mode.
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this.encryptedData = input.substring(position, position + len);
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return this;
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}
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/**
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* Symmetrically decrypt the packet data
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*
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* @param {Integer} symmetric_algorithm_type
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* Symmetric key algorithm to use // See RFC4880 9.2
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* @param {String} key
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* Key as string with the corresponding length to the
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* algorithm
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* @return The decrypted data;
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*/
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function decrypt_sym(symmetric_algorithm_type, key) {
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this.decryptedData = openpgp_crypto_symmetricDecrypt(
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symmetric_algorithm_type, key, this.encryptedData, true);
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util.print_debug("openpgp.packet.encryptedintegrityprotecteddata.js\n"+
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"data: "+util.hexstrdump(this.decryptedData));
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return this.decryptedData;
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}
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/**
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* Creates a string representation of the packet
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*
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* @param {Integer} algo Symmetric key algorithm to use // See RFC4880 9.2
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* @param {String} key Key as string with the corresponding length to the
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* algorithm
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* @param {String} data Data to be
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* @return {String} String-representation of the packet
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*/
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function write_packet(algo, key, data) {
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var result = "";
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result += openpgp_crypto_symmetricEncrypt(
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openpgp_crypto_getPrefixRandom(algo), algo, key, data, true);
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result = openpgp_packet.write_packet_header(9, result.length) + result;
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return result;
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}
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function toString() {
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return '5.7. Symmetrically Encrypted Data Packet (Tag 9)\n'
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+ ' length: ' + this.packetLength + '\n'
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+ ' Used symmetric algorithm: ' + this.algorithmType + '\n'
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+ ' encrypted data: Bytes ['
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+ util.hexstrdump(this.encryptedData) + ']\n';
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}
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this.decrypt_sym = decrypt_sym;
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this.toString = toString;
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this.read_packet = read_packet;
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this.write_packet = write_packet;
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};
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</code></pre>
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</article>
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</section>
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<h2><a href="index.html">Index</a></h2><h3>Classes</h3><ul><li><a href="_openpgp_packet.html">_openpgp_packet</a></li><li><a href="JXG.Util.html">Util</a></li><li><a href="openpgp.html">openpgp</a></li><li><a href="openpgp_config.html">openpgp_config</a></li><li><a href="openpgp_keyring.html">openpgp_keyring</a></li><li><a href="openpgp_msg_message.html">openpgp_msg_message</a></li><li><a href="openpgp_msg_privatekey.html">openpgp_msg_privatekey</a></li><li><a href="openpgp_msg_publickey.html">openpgp_msg_publickey</a></li><li><a href="openpgp_packet_compressed.html">openpgp_packet_compressed</a></li><li><a href="openpgp_packet_encrypteddata.html">openpgp_packet_encrypteddata</a></li><li><a href="openpgp_packet_encryptedintegrityprotecteddata.html">openpgp_packet_encryptedintegrityprotecteddata</a></li><li><a href="openpgp_packet_encryptedsessionkey.html">openpgp_packet_encryptedsessionkey</a></li><li><a href="openpgp_packet_keymaterial.html">openpgp_packet_keymaterial</a></li><li><a href="openpgp_packet_literaldata.html">openpgp_packet_literaldata</a></li><li><a href="openpgp_packet_marker.html">openpgp_packet_marker</a></li><li><a href="openpgp_packet_modificationdetectioncode.html">openpgp_packet_modificationdetectioncode</a></li><li><a href="openpgp_packet_onepasssignature.html">openpgp_packet_onepasssignature</a></li><li><a href="openpgp_packet_signature.html">openpgp_packet_signature</a></li><li><a href="openpgp_packet_userattribute.html">openpgp_packet_userattribute</a></li><li><a href="openpgp_packet_userid.html">openpgp_packet_userid</a></li><li><a href="openpgp_type_keyid.html">openpgp_type_keyid</a></li><li><a href="openpgp_type_mpi.html">openpgp_type_mpi</a></li><li><a href="openpgp_type_s2k.html">openpgp_type_s2k</a></li></ul><h3>Global</h3><ul><li><a href="global.html#bin2str">bin2str</a></li><li><a href="global.html#calc_checksum">calc_checksum</a></li><li><a href="global.html#crc_table">crc_table</a></li><li><a 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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0-dev</a> on Fri Apr 12 2013 14:20:33 GMT+0200 (CEST)
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