233 lines
11 KiB
HTML
233 lines
11 KiB
HTML
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<title>JSDoc: Source: packet/public_key_encrypted_session_key.js</title>
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<h1 class="page-title">Source: packet/public_key_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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* 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/keyid
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* @requires type/mpi
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* @requires util
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* @module packet/public_key_encrypted_session_key
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*/
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var type_keyid = require('../type/keyid.js'),
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util = require('../util'),
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type_mpi = require('../type/mpi.js'),
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enums = require('../enums.js'),
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crypto = require('../crypto');
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/**
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* @constructor
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*/
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module.exports = function public_key_encrypted_session_key() {
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this.version = 3;
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this.publicKeyId = new type_keyid();
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this.publicKeyAlgorithm = 'rsa_encrypt';
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this.sessionKey = null;
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this.sessionKeyAlgorithm = 'aes256';
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/** @type {Array<module:type/mpi>} */
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this.encrypted = [];
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/**
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* Parsing function for a publickey encrypted session key packet (tag 1).
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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 Length of the packet or the remaining length of
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* input at position
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* @return {module:packet/public_key_encrypted_session_key} Object representation
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*/
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this.read = function (bytes) {
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this.version = bytes.charCodeAt(0);
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this.publicKeyId.read(bytes.substr(1));
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this.publicKeyAlgorithm = enums.read(enums.publicKey, bytes.charCodeAt(9));
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var i = 10;
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var integerCount = (function(algo) {
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switch (algo) {
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case 'rsa_encrypt':
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case 'rsa_encrypt_sign':
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return 1;
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case 'elgamal':
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return 2;
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default:
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throw new Error("Invalid algorithm.");
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}
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})(this.publicKeyAlgorithm);
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this.encrypted = [];
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for (var j = 0; j < integerCount; j++) {
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var mpi = new type_mpi();
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i += mpi.read(bytes.substr(i));
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this.encrypted.push(mpi);
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}
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};
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/**
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* Create a string representation of a tag 1 packet
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*
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* @param {String} publicKeyId
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* The public key id corresponding to publicMPIs key as string
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* @param {Array<module:type/mpi>} publicMPIs
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* Multiprecision integer objects describing the public key
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* @param {Integer} pubalgo
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* The corresponding public key algorithm // See RFC4880 9.1
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* @param {Integer} symmalgo
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* The symmetric cipher algorithm used to encrypt the data
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* within an encrypteddatapacket or encryptedintegrity-
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* protecteddatapacket
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* following this packet //See RFC4880 9.2
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* @param {String} sessionkey
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* A string of randombytes representing the session key
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* @return {String} The string representation
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*/
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this.write = function () {
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var result = String.fromCharCode(this.version);
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result += this.publicKeyId.write();
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result += String.fromCharCode(
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enums.write(enums.publicKey, this.publicKeyAlgorithm));
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for (var i = 0; i < this.encrypted.length; i++) {
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result += this.encrypted[i].write()
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}
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return result;
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};
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this.encrypt = function (key) {
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var data = String.fromCharCode(
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enums.write(enums.symmetric, this.sessionKeyAlgorithm));
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data += this.sessionKey;
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var checksum = util.calc_checksum(this.sessionKey);
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data += util.writeNumber(checksum, 2);
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var mpi = new type_mpi();
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mpi.fromBytes(crypto.pkcs1.eme.encode(
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data,
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key.mpi[0].byteLength()));
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this.encrypted = crypto.publicKeyEncrypt(
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this.publicKeyAlgorithm,
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key.mpi,
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mpi);
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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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* @param {module:packet/secret_key} key
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* Private key with secMPIs unlocked
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* @return {String} The unencrypted session key
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*/
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this.decrypt = function (key) {
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var result = crypto.publicKeyDecrypt(
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this.publicKeyAlgorithm,
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key.mpi,
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this.encrypted).toBytes();
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var checksum = util.readNumber(result.substr(result.length - 2));
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var decoded = crypto.pkcs1.eme.decode(
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result,
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key.mpi[0].byteLength());
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var key = decoded.substring(1, decoded.length - 2);
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if (checksum != util.calc_checksum(key)) {
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throw new Error('Checksum mismatch');
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} else {
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this.sessionKey = key;
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this.sessionKeyAlgorithm =
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enums.read(enums.symmetric, decoded.charCodeAt(0));
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}
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};
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};
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</code></pre>
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</article>
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