276 lines
15 KiB
HTML
276 lines
15 KiB
HTML
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<title>JSDoc: Source: packet/openpgp.packet.encryptedsessionkey.js</title>
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<h1 class="page-title">Source: packet/openpgp.packet.encryptedsessionkey.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 Public-Key Encrypted Session Key Packets (Tag 1)
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*
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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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*/
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function openpgp_packet_encryptedsessionkey() {
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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 {openpgp_packet_encrypteddata} Object representation
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*/
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function read_pub_key_packet(input, position, len) {
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this.tagType = 1;
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this.packetLength = len;
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var mypos = position;
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if (len < 10) {
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util
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.print_error("openpgp.packet.encryptedsessionkey.js\n" + 'invalid length');
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return null;
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}
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this.version = input[mypos++].charCodeAt();
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this.keyId = new openpgp_type_keyid();
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this.keyId.read_packet(input, mypos);
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mypos += 8;
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this.publicKeyAlgorithmUsed = input[mypos++].charCodeAt();
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switch (this.publicKeyAlgorithmUsed) {
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case 1:
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case 2: // RSA
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this.MPIs = new Array();
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this.MPIs[0] = new openpgp_type_mpi();
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this.MPIs[0].read(input, mypos, mypos - position);
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break;
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case 16: // Elgamal
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this.MPIs = new Array();
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this.MPIs[0] = new openpgp_type_mpi();
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this.MPIs[0].read(input, mypos, mypos - position);
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mypos += this.MPIs[0].packetLength;
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this.MPIs[1] = new openpgp_type_mpi();
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this.MPIs[1].read(input, mypos, mypos - position);
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break;
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default:
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util.print_error("openpgp.packet.encryptedsessionkey.js\n"
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+ "unknown public key packet algorithm type "
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+ this.publicKeyAlgorithmType);
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break;
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}
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return this;
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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 {openpgp_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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function write_pub_key_packet(publicKeyId, publicMPIs, pubalgo, symmalgo,
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sessionkey) {
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var result = String.fromCharCode(3);
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var data = String.fromCharCode(symmalgo);
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data += sessionkey;
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var checksum = util.calc_checksum(sessionkey);
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data += String.fromCharCode((checksum >> 8) & 0xFF);
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data += String.fromCharCode((checksum) & 0xFF);
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result += publicKeyId;
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result += String.fromCharCode(pubalgo);
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var mpi = new openpgp_type_mpi();
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var mpiresult = openpgp_crypto_asymetricEncrypt(pubalgo, publicMPIs,
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mpi.create(openpgp_encoding_eme_pkcs1_encode(data,
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publicMPIs[0].mpiByteLength)));
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for ( var i = 0; i < mpiresult.length; i++) {
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result += mpiresult[i];
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}
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result = openpgp_packet.write_packet_header(1, result.length) + result;
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return result;
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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 {openpgp_packet_encrypteddata} Object representation
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*/
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function read_symmetric_key_packet(input, position, len) {
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this.tagType = 3;
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var mypos = position;
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// A one-octet version number. The only currently defined version is 4.
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this.version = input[mypos++];
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// A one-octet number describing the symmetric algorithm used.
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this.symmetricKeyAlgorithmUsed = input[mypos++];
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// A string-to-key (S2K) specifier, length as defined above.
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this.s2k = new openpgp_type_s2k();
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this.s2k.read(input, mypos);
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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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if ((s2k.s2kLength + mypos) < len) {
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this.encryptedSessionKey = new Array();
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for ( var i = (mypos - position); i < len; i++) {
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this.encryptedSessionKey[i] = input[mypos++];
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}
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}
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return this;
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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 {openpgp_msg_message} msg
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* The message object (with member encryptedData
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* @param {openpgp_msg_privatekey} 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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function decrypt(msg, key) {
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if (this.tagType == 1) {
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var result = openpgp_crypto_asymetricDecrypt(
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this.publicKeyAlgorithmUsed, key.publicKey.MPIs,
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key.secMPIs, this.MPIs).toMPI();
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var checksum = ((result.charCodeAt(result.length - 2) << 8) + result
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.charCodeAt(result.length - 1));
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var decoded = openpgp_encoding_eme_pkcs1_decode(result.substring(2, result.length - 2), key.publicKey.MPIs[0].getByteLength());
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var sesskey = decoded.substring(1);
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var algo = decoded.charCodeAt(0);
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if (msg.encryptedData.tagType == 18)
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return msg.encryptedData.decrypt(algo, sesskey);
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else
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return msg.encryptedData.decrypt_sym(algo, sesskey);
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} else if (this.tagType == 3) {
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util
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.print_error("Symmetric encrypted sessionkey is not supported!");
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return null;
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}
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}
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/**
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* Creates a string representation of this object (useful for debug
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* purposes)
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*
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* @return {String} The string containing a openpgp description
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*/
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function toString() {
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if (this.tagType == 1) {
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var result = '5.1. Public-Key Encrypted Session Key Packets (Tag 1)\n'
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+ ' KeyId: '
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+ this.keyId.toString()
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+ '\n'
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+ ' length: '
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+ this.packetLength
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+ '\n'
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+ ' version:'
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+ this.version
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+ '\n'
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+ ' pubAlgUs:'
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+ this.publicKeyAlgorithmUsed + '\n';
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for ( var i = 0; i < this.MPIs.length; i++) {
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result += this.MPIs[i].toString();
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}
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return result;
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} else
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return '5.3 Symmetric-Key Encrypted Session Key Packets (Tag 3)\n'
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+ ' KeyId: ' + this.keyId.toString() + '\n'
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+ ' length: ' + this.packetLength + '\n'
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+ ' version:' + this.version + '\n' + ' symKeyA:'
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+ this.symmetricKeyAlgorithmUsed + '\n' + ' s2k: '
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+ this.s2k + '\n';
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}
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this.read_pub_key_packet = read_pub_key_packet;
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this.read_symmetric_key_packet = read_symmetric_key_packet;
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this.write_pub_key_packet = write_pub_key_packet;
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this.toString = toString;
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this.decrypt = decrypt;
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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 href="global.html#get_hashAlgorithmString">get_hashAlgorithmString</a></li><li><a href="global.html#getCheckSum">getCheckSum</a></li><li><a href="global.html#getPGPMessageType">getPGPMessageType</a></li><li><a href="global.html#hash_headers">hash_headers</a></li><li><a href="global.html#hex2bin">hex2bin</a></li><li><a href="global.html#hexidump">hexidump</a></li><li><a href="global.html#hexstrdump">hexstrdump</a></li><li><a href="global.html#MD5">MD5</a></li><li><a href="global.html#openpgp_cfb_decrypt">openpgp_cfb_decrypt</a></li><li><a href="global.html#openpgp_cfb_encrypt">openpgp_cfb_encrypt</a></li><li><a href="global.html#openpgp_cfb_mdc">openpgp_cfb_mdc</a></li><li><a href="global.html#openpgp_crypto_asymetricDecrypt">openpgp_crypto_asymetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_asymetricEncrypt">openpgp_crypto_asymetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_generateKeyPair">openpgp_crypto_generateKeyPair</a></li><li><a href="global.html#openpgp_crypto_generateSessionKey">openpgp_crypto_generateSessionKey</a></li><li><a href="global.html#openpgp_crypto_getHashByteLength">openpgp_crypto_getHashByteLength</a></li><li><a href="global.html#openpgp_crypto_getPrefixRandom">openpgp_crypto_getPrefixRandom</a></li><li><a href="global.html#openpgp_crypto_getPseudoRandom">openpgp_crypto_getPseudoRandom</a></li><li><a href="global.html#openpgp_crypto_getRandomBigInteger">openpgp_crypto_getRandomBigInteger</a></li><li><a href="global.html#openpgp_crypto_getRandomBytes">openpgp_crypto_getRandomBytes</a></li><li><a href="global.html#openpgp_crypto_getSecureRandom">openpgp_crypto_getSecureRandom</a></li><li><a href="global.html#openpgp_crypto_hashData">openpgp_crypto_hashData</a></li><li><a href="global.html#openpgp_crypto_MDCSystemBytes">openpgp_crypto_MDCSystemBytes</a></li><li><a href="global.html#openpgp_crypto_signData">openpgp_crypto_signData</a></li><li><a href="global.html#openpgp_crypto_symmetricDecrypt">openpgp_crypto_symmetricDecrypt</a></li><li><a href="global.html#openpgp_crypto_symmetricEncrypt">openpgp_crypto_symmetricEncrypt</a></li><li><a href="global.html#openpgp_crypto_verifySignature">openpgp_crypto_verifySignature</a></li><li><a href="global.html#openpgp_encoding_armor">openpgp_encoding_armor</a></li><li><a href="global.html#openpgp_encoding_armor_addheader">openpgp_encoding_armor_addheader</a></li><li><a href="global.html#openpgp_encoding_base64_decode">openpgp_encoding_base64_decode</a></li><li><a href="global.html#openpgp_encoding_base64_encode">openpgp_encoding_base64_encode</a></li><li><a href="global.html#openpgp_encoding_deArmor">openpgp_encoding_deArmor</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_decode">openpgp_encoding_eme_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_eme_pkcs1_encode">openpgp_encoding_eme_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_decode">openpgp_encoding_emsa_pkcs1_decode</a></li><li><a href="global.html#openpgp_encoding_emsa_pkcs1_encode">openpgp_encoding_emsa_pkcs1_encode</a></li><li><a href="global.html#openpgp_encoding_html_encode">openpgp_encoding_html_encode</a></li><li><a href="global.html#print_debug">print_debug</a></li><li><a href="global.html#print_debug_hexstr_dump">print_debug_hexstr_dump</a></li><li><a href="global.html#print_error">print_error</a></li><li><a href="global.html#print_info">print_info</a></li><li><a href="global.html#shiftRight">shiftRight</a></li><li><a href="global.html#str2bin">str2bin</a></li><li><a href="global.html#str2Uint8Array">str2Uint8Array</a></li><li><a href="global.html#Uint8Array2str">Uint8Array2str</a></li><li><a href="global.html#util">util</a></li><li><a href="global.html#verifyCheckSum">verifyCheckSum</a></li></ul>
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