193 lines
12 KiB
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193 lines
12 KiB
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<title>JSDoc: Source: packet/sym_encrypted_session_key.js</title>
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<h1 class="page-title">Source: packet/sym_encrypted_session_key.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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* Public-Key Encrypted Session Key Packets (Tag 1)<br/>
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* <br/>
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* {@link http://tools.ietf.org/html/rfc4880#section-5.1|RFC4880 5.1}: A Public-Key Encrypted Session Key packet holds the session key
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* used to encrypt a message. Zero or more Public-Key Encrypted Session Key
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* packets and/or Symmetric-Key Encrypted Session Key packets may precede a
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* Symmetrically Encrypted Data Packet, which holds an encrypted message. The
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* message is encrypted with the session key, and the session key is itself
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* encrypted and stored in the Encrypted Session Key packet(s). The
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* Symmetrically Encrypted Data Packet is preceded by one Public-Key Encrypted
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* Session Key packet for each OpenPGP key to which the message is encrypted.
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* The recipient of the message finds a session key that is encrypted to their
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* public key, decrypts the session key, and then uses the session key to
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* decrypt the message.
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* @requires crypto
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* @requires enums
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* @requires type/s2k
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* @module packet/sym_encrypted_session_key
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*/
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var type_s2k = require('../type/s2k.js'),
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enums = require('../enums.js'),
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crypto = require('../crypto');
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module.exports = SymEncryptedSessionKey;
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/**
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* @constructor
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*/
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function SymEncryptedSessionKey() {
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this.tag = 3;
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this.sessionKeyEncryptionAlgorithm = null;
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this.sessionKeyAlgorithm = 'aes256';
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this.encrypted = null;
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this.s2k = new type_s2k();
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}
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/**
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* Parsing function for a symmetric encrypted session key packet (tag 3).
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*
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* @param {String} input Payload of a tag 1 packet
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* @param {Integer} position Position to start reading from the input string
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* @param {Integer} len
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* Length of the packet or the remaining length of
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* input at position
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* @return {module:packet/sym_encrypted_session_key} Object representation
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*/
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SymEncryptedSessionKey.prototype.read = function(bytes) {
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// A one-octet version number. The only currently defined version is 4.
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this.version = bytes.charCodeAt(0);
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// A one-octet number describing the symmetric algorithm used.
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var algo = enums.read(enums.symmetric, bytes.charCodeAt(1));
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// A string-to-key (S2K) specifier, length as defined above.
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var s2klength = this.s2k.read(bytes.substr(2));
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// Optionally, the encrypted session key itself, which is decrypted
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// with the string-to-key object.
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var done = s2klength + 2;
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if (done < bytes.length) {
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this.encrypted = bytes.substr(done);
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this.sessionKeyEncryptionAlgorithm = algo;
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} else
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this.sessionKeyAlgorithm = algo;
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};
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SymEncryptedSessionKey.prototype.write = function() {
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var algo = this.encrypted === null ?
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this.sessionKeyAlgorithm :
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this.sessionKeyEncryptionAlgorithm;
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var bytes = String.fromCharCode(this.version) +
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String.fromCharCode(enums.write(enums.symmetric, algo)) +
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this.s2k.write();
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if (this.encrypted !== null)
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bytes += this.encrypted;
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return bytes;
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};
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/**
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* Decrypts the session key (only for public key encrypted session key
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* packets (tag 1)
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*
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* @return {String} The unencrypted session key
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*/
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SymEncryptedSessionKey.prototype.decrypt = function(passphrase) {
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var algo = this.sessionKeyEncryptionAlgorithm !== null ?
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this.sessionKeyEncryptionAlgorithm :
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this.sessionKeyAlgorithm;
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var length = crypto.cipher[algo].keySize;
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var key = this.s2k.produce_key(passphrase, length);
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if (this.encrypted === null) {
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this.sessionKey = key;
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} else {
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var decrypted = crypto.cfb.decrypt(
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this.sessionKeyEncryptionAlgorithm, key, this.encrypted, true);
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this.sessionKeyAlgorithm = enums.read(enums.symmetric,
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decrypted[0].keyCodeAt());
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this.sessionKey = decrypted.substr(1);
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}
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};
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SymEncryptedSessionKey.prototype.encrypt = function(passphrase) {
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var length = crypto.getKeyLength(this.sessionKeyEncryptionAlgorithm);
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var key = this.s2k.produce_key(passphrase, length);
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var private_key = String.fromCharCode(
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enums.write(enums.symmetric, this.sessionKeyAlgorithm)) +
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crypto.getRandomBytes(
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crypto.getKeyLength(this.sessionKeyAlgorithm));
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this.encrypted = crypto.cfb.encrypt(
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crypto.getPrefixRandom(this.sessionKeyEncryptionAlgorithm),
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this.sessionKeyEncryptionAlgorithm, key, private_key, true);
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};
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</code></pre>
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