74 lines
2.5 KiB
JavaScript
74 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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* Implementation of the Symmetrically Encrypted Data Packet (Tag 9)<br/>
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* <br/>
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* {@link http://tools.ietf.org/html/rfc4880#section-5.7|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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* @requires crypto
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* @module packet/symmetrically_encrypted
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*/
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module.exports = SymmetricallyEncrypted;
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var crypto = require('../crypto');
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/**
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* @constructor
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*/
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function SymmetricallyEncrypted() {
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this.encrypted = null;
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/** Decrypted packets contained within.
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* @type {module:packet/packetlist} */
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this.packets = null;
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}
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SymmetricallyEncrypted.prototype.read = function (bytes) {
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this.encrypted = bytes;
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};
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SymmetricallyEncrypted.prototype.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 {module:enums.symmetric} sessionKeyAlgorithm
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* Symmetric key algorithm to use // See {@link http://tools.ietf.org/html/rfc4880#section-9.2|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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*/
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SymmetricallyEncrypted.prototype.decrypt = function (sessionKeyAlgorithm, key) {
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var decrypted = crypto.cfb.decrypt(
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sessionKeyAlgorithm, key, this.encrypted, true);
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this.packets.read(decrypted);
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};
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SymmetricallyEncrypted.prototype.encrypt = function (algo, key) {
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var data = this.packets.write();
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this.encrypted = crypto.cfb.encrypt(
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crypto.getPrefixRandom(algo), algo, data, key, true);
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};
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