120 lines
5.3 KiB
JavaScript
120 lines
5.3 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 One-Pass Signature Packets (Tag 4)
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*
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* RFC4880 5.4:
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* The One-Pass Signature packet precedes the signed data and contains
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* enough information to allow the receiver to begin calculating any
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* hashes needed to verify the signature. It allows the Signature
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* packet to be placed at the end of the message, so that the signer
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* can compute the entire signed message in one pass.
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*/
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function openpgp_packet_onepasssignature() {
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this.tagType = 4;
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this.version = null; // A one-octet version number. The current version is 3.
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this.type = null; // A one-octet signature type. Signature types are described in RFC4880 Section 5.2.1.
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this.hashAlgorithm = null; // A one-octet number describing the hash algorithm used. (See RFC4880 9.4)
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this.publicKeyAlgorithm = null; // A one-octet number describing the public-key algorithm used. (See RFC4880 9.1)
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this.signingKeyId = null; // An eight-octet number holding the Key ID of the signing key.
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this.flags = null; // A one-octet number holding a flag showing whether the signature is nested. A zero value indicates that the next packet is another One-Pass Signature packet that describes another signature to be applied to the same message data.
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/**
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* parsing function for a one-pass signature packet (tag 4).
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* @param {string} input payload of a tag 4 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 input at position
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* @return {openpgp_packet_encrypteddata} object representation
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*/
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function read_packet(input, position, len) {
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this.packetLength = len;
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var mypos = position;
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// A one-octet version number. The current version is 3.
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this.version = input.charCodeAt(mypos++);
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// A one-octet signature type. Signature types are described in
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// Section 5.2.1.
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this.type = input.charCodeAt(mypos++);
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// A one-octet number describing the hash algorithm used.
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this.hashAlgorithm = input.charCodeAt(mypos++);
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// A one-octet number describing the public-key algorithm used.
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this.publicKeyAlgorithm = input.charCodeAt(mypos++);
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// An eight-octet number holding the Key ID of the signing key.
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this.signingKeyId = new openpgp_type_keyid();
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this.signingKeyId.read_packet(input,mypos);
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mypos += 8;
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// A one-octet number holding a flag showing whether the signature
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// is nested. A zero value indicates that the next packet is
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// another One-Pass Signature packet that describes another
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// signature to be applied to the same message data.
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this.flags = input.charCodeAt(mypos++);
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return this;
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}
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/**
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* creates a string representation of a one-pass signature packet
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* @param {integer} type Signature types as described in RFC4880 Section 5.2.1.
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* @param {integer} hashalgorithm the hash algorithm used within the signature
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* @param {openpgp_msg_privatekey} privatekey the private key used to generate the signature
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* @param {integer} length length of data to be signed
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* @param {boolean} nested boolean showing whether the signature is nested.
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* "true" indicates that the next packet is another One-Pass Signature packet
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* that describes another signature to be applied to the same message data.
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* @return {String} a string representation of a one-pass signature packet
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*/
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function write_packet(type, hashalgorithm, privatekey,length, nested) {
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var result ="";
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result += openpgp_packet.write_packet_header(4,13);
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result += String.fromCharCode(3);
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result += String.fromCharCode(type);
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result += String.fromCharCode(hashalgorithm);
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result += String.fromCharCode(privatekey.privateKeyPacket.publicKey.publicKeyAlgorithm);
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result += privatekey.getKeyId();
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if (nested)
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result += String.fromCharCode(0);
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else
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result += String.fromCharCode(1);
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return result;
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}
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/**
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* generates debug output (pretty print)
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* @return {string} String which gives some information about the one-pass signature packet
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*/
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function toString() {
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return '5.4. One-Pass Signature Packets (Tag 4)\n'+
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' length: '+this.packetLength+'\n'+
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' type: '+this.type+'\n'+
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' keyID: '+this.signingKeyId.toString()+'\n'+
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' hashA: '+this.hashAlgorithm+'\n'+
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' pubKeyA:'+this.publicKeyAlgorithm+'\n'+
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' flags: '+this.flags+'\n'+
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' version:'+this.version+'\n';
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}
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this.read_packet = read_packet;
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this.toString = toString;
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this.write_packet = write_packet;
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};
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