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77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
// 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_symmetrically_encrypted() {
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this.tag = 9;
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this.encrypted = null;
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this.data = new openpgp_packetlist();
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this.algorithm = openpgp.symmetric.plaintext;
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this.read = function(bytes) {
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this.encrypted = bytes;
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}
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this.write = function() {
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return this.encrypted;
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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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this.decrypt = function(symmetric_algorithm_type, key) {
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var decrypted = openpgp_crypto_symmetricDecrypt(
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symmetric_algorithm_type, key, this.encrypted, true);
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this.data.read(decrypted);
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}
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this.encrypt = function(algo, key) {
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var data = this.data.write();
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this.encrypted = openpgp_crypto_symmetricEncrypt(
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openpgp_crypto_getPrefixRandom(algo), algo, key, data, true);
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}
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this.toString = function () {
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return '5.7. Symmetrically Encrypted Data Packet (Tag 9)\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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};
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