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<h1 class="page-title">Source: packet/signature.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* Implementation of the Signature Packet (Tag 2)<br/>
* <br/>
* {@link http://tools.ietf.org/html/rfc4880#section-5.2|RFC4480 5.2}:
* A Signature packet describes a binding between some public key and
* some data. The most common signatures are a signature of a file or a
* block of text, and a signature that is a certification of a User ID.
* @requires crypto
* @requires enums
* @requires packet/packet
* @requires type/keyid
* @requires type/mpi
* @requires util
* @module packet/signature
*/
module.exports = Signature;
var util = require('../util.js'),
packet = require('./packet.js'),
enums = require('../enums.js'),
crypto = require('../crypto'),
type_mpi = require('../type/mpi.js'),
type_keyid = require('../type/keyid.js');
/**
* @constructor
*/
function Signature() {
this.tag = enums.packet.signature;
this.version = 4;
this.signatureType = null;
this.hashAlgorithm = null;
this.publicKeyAlgorithm = null;
this.signatureData = null;
this.signedHashValue = null;
this.created = new Date();
this.signatureExpirationTime = null;
this.signatureNeverExpires = true;
this.exportable = null;
this.trustLevel = null;
this.trustAmount = null;
this.regularExpression = null;
this.revocable = null;
this.keyExpirationTime = null;
this.keyNeverExpires = null;
this.preferredSymmetricAlgorithms = null;
this.revocationKeyClass = null;
this.revocationKeyAlgorithm = null;
this.revocationKeyFingerprint = null;
this.issuerKeyId = new type_keyid();
this.notation = null;
this.preferredHashAlgorithms = null;
this.preferredCompressionAlgorithms = null;
this.keyServerPreferences = null;
this.preferredKeyServer = null;
this.isPrimaryUserID = null;
this.policyURI = null;
this.keyFlags = null;
this.signersUserId = null;
this.reasonForRevocationFlag = null;
this.reasonForRevocationString = null;
this.features = null;
this.signatureTargetPublicKeyAlgorithm = null;
this.signatureTargetHashAlgorithm = null;
this.signatureTargetHash = null;
this.embeddedSignature = null;
this.verified = false;
}
/**
* parsing function for a signature packet (tag 2).
* @param {String} bytes payload of a tag 2 packet
* @param {Integer} position position to start reading from the bytes string
* @param {Integer} len length of the packet or the remaining length of bytes at position
* @return {module:packet/signature} object representation
*/
Signature.prototype.read = function (bytes) {
var i = 0;
this.version = bytes.charCodeAt(i++);
// switch on version (3 and 4)
switch (this.version) {
case 3:
// One-octet length of following hashed material. MUST be 5.
if (bytes.charCodeAt(i++) != 5)
util.print_debug("packet/signature.js\n" +
'invalid One-octet length of following hashed material.' +
'MUST be 5. @:' + (i - 1));
var sigpos = i;
// One-octet signature type.
this.signatureType = bytes.charCodeAt(i++);
// Four-octet creation time.
this.created = util.readDate(bytes.substr(i, 4));
i += 4;
// storing data appended to data which gets verified
this.signatureData = bytes.substring(sigpos, i);
// Eight-octet Key ID of signer.
this.issuerKeyId.read(bytes.substring(i, i + 8));
i += 8;
// One-octet public-key algorithm.
this.publicKeyAlgorithm = bytes.charCodeAt(i++);
// One-octet hash algorithm.
this.hashAlgorithm = bytes.charCodeAt(i++);
break;
case 4:
this.signatureType = bytes.charCodeAt(i++);
this.publicKeyAlgorithm = bytes.charCodeAt(i++);
this.hashAlgorithm = bytes.charCodeAt(i++);
function subpackets(bytes) {
// Two-octet scalar octet count for following subpacket data.
var subpacket_length = util.readNumber(
bytes.substr(0, 2));
var i = 2;
// subpacket data set (zero or more subpackets)
var subpacked_read = 0;
while (i < 2 + subpacket_length) {
var len = packet.readSimpleLength(bytes.substr(i));
i += len.offset;
this.read_sub_packet(bytes.substr(i, len.len));
i += len.len;
}
return i;
}
// hashed subpackets
i += subpackets.call(this, bytes.substr(i), true);
// A V4 signature hashes the packet body
// starting from its first field, the version number, through the end
// of the hashed subpacket data. Thus, the fields hashed are the
// signature version, the signature type, the public-key algorithm, the
// hash algorithm, the hashed subpacket length, and the hashed
// subpacket body.
this.signatureData = bytes.substr(0, i);
// unhashed subpackets
i += subpackets.call(this, bytes.substr(i), false);
break;
default:
throw new Error('Version ' + version + ' of the signature is unsupported.');
}
// Two-octet field holding left 16 bits of signed hash value.
this.signedHashValue = bytes.substr(i, 2);
i += 2;
this.signature = bytes.substr(i);
};
Signature.prototype.write = function () {
return this.signatureData +
util.writeNumber(0, 2) + // Number of unsigned subpackets.
this.signedHashValue +
this.signature;
};
/**
* Signs provided data. This needs to be done prior to serialization.
* @param {module:packet/secret_key} key private key used to sign the message.
* @param {Object} data Contains packets to be signed.
*/
Signature.prototype.sign = function (key, data) {
var signatureType = enums.write(enums.signature, this.signatureType),
publicKeyAlgorithm = enums.write(enums.publicKey, this.publicKeyAlgorithm),
hashAlgorithm = enums.write(enums.hash, this.hashAlgorithm);
var result = String.fromCharCode(4);
result += String.fromCharCode(signatureType);
result += String.fromCharCode(publicKeyAlgorithm);
result += String.fromCharCode(hashAlgorithm);
this.issuerKeyId = key.getKeyId();
// Add hashed subpackets
result += this.write_all_sub_packets();
this.signatureData = result;
var trailer = this.calculateTrailer();
var toHash = this.toSign(signatureType, data) +
this.signatureData + trailer;
var hash = crypto.hash.digest(hashAlgorithm, toHash);
this.signedHashValue = hash.substr(0, 2);
this.signature = crypto.signature.sign(hashAlgorithm,
publicKeyAlgorithm, key.mpi, toHash);
};
/**
* Creates string of bytes with all subpacket data
* @return {String} a string-representation of a all subpacket data
*/
Signature.prototype.write_all_sub_packets = function () {
var sub = enums.signatureSubpacket;
var result = '';
var bytes = '';
if (this.created !== null) {
result += write_sub_packet(sub.signature_creation_time, util.writeDate(this.created));
}
if (this.signatureExpirationTime !== null) {
result += write_sub_packet(sub.signature_expiration_time, util.writeNumber(this.signatureExpirationTime, 4));
}
if (this.exportable !== null) {
result += write_sub_packet(sub.exportable_certification, String.fromCharCode(this.exportable ? 1 : 0));
}
if (this.trustLevel !== null) {
bytes = String.fromCharCode(this.trustLevel) + String.fromCharCode(this.trustAmount);
result += write_sub_packet(sub.trust_signature, bytes);
}
if (this.regularExpression !== null) {
result += write_sub_packet(sub.regular_expression, this.regularExpression);
}
if (this.revocable !== null) {
result += write_sub_packet(sub.revocable, String.fromCharCode(this.revocable ? 1 : 0));
}
if (this.keyExpirationTime !== null) {
result += write_sub_packet(sub.key_expiration_time, util.writeNumber(this.keyExpirationTime, 4));
}
if (this.preferredSymmetricAlgorithms !== null) {
bytes = util.bin2str(this.preferredSymmetricAlgorithms);
result += write_sub_packet(sub.preferred_symmetric_algorithms, bytes);
}
if (this.revocationKeyClass !== null) {
bytes = String.fromCharCode(this.revocationKeyClass);
bytes += String.fromCharCode(this.revocationKeyAlgorithm);
bytes += this.revocationKeyFingerprint;
result += write_sub_packet(sub.revocation_key, bytes);
}
if (!this.issuerKeyId.isNull()) {
result += write_sub_packet(sub.issuer, this.issuerKeyId.write());
}
if (this.notation !== null) {
for (var name in this.notation) {
if (this.notation.hasOwnProperty(name)) {
var value = this.notation[name];
bytes = String.fromCharCode(0x80);
bytes += String.fromCharCode(0);
bytes += String.fromCharCode(0);
bytes += String.fromCharCode(0);
// 2 octets of name length
bytes += util.writeNumber(name.length, 2);
// 2 octets of value length
bytes += util.writeNumber(value.length, 2);
bytes += name + value;
result += write_sub_packet(sub.notation_data, bytes);
}
}
}
if (this.preferredHashAlgorithms !== null) {
bytes = util.bin2str(this.preferredHashAlgorithms);
result += write_sub_packet(sub.preferred_hash_algorithms, bytes);
}
if (this.preferredCompressionAlgorithms !== null) {
bytes = util.bin2str(this.preferredCompressionAlgorithms);
result += write_sub_packet(sub.preferred_hash_algorithms, bytes);
}
if (this.keyServerPreferences !== null) {
bytes = util.bin2str(this.keyServerPreferences);
result += write_sub_packet(sub.key_server_preferences, bytes);
}
if (this.preferredKeyServer !== null) {
result += write_sub_packet(sub.preferred_key_server, this.preferredKeyServer);
}
if (this.isPrimaryUserID !== null) {
result += write_sub_packet(sub.primary_user_id, String.fromCharCode(this.isPrimaryUserID ? 1 : 0));
}
if (this.policyURI !== null) {
result += write_sub_packet(sub.policy_uri, this.policyURI);
}
if (this.keyFlags !== null) {
bytes = util.bin2str(this.keyFlags);
result += write_sub_packet(sub.key_flags, bytes);
}
if (this.signersUserId !== null) {
result += write_sub_packet(sub.signers_user_id, this.signersUserId);
}
if (this.reasonForRevocationFlag !== null) {
bytes = String.fromCharCode(this.reasonForRevocationFlag);
bytes += this.reasonForRevocationString;
result += write_sub_packet(sub.reason_for_revocation, bytes);
}
if (this.features !== null) {
bytes = util.bin2str(this.features);
result += write_sub_packet(sub.features, bytes);
}
if (this.signatureTargetPublicKeyAlgorithm !== null) {
bytes = String.fromCharCode(this.signatureTargetPublicKeyAlgorithm);
bytes += String.fromCharCode(this.signatureTargetHashAlgorithm);
bytes += this.signatureTargetHash;
result += write_sub_packet(sub.signature_target, bytes);
}
if (this.embeddedSignature !== null) {
result += write_sub_packet(sub.embedded_signature, this.embeddedSignature.write());
}
result = util.writeNumber(result.length, 2) + result;
return result;
};
/**
* creates a string representation of a sub signature packet (See {@link http://tools.ietf.org/html/rfc4880#section-5.2.3.1|RFC 4880 5.2.3.1})
* @param {Integer} type subpacket signature type. Signature types as described
* in {@link http://tools.ietf.org/html/rfc4880#section-5.2.3.2|RFC4880 Section 5.2.3.2}
* @param {String} data data to be included
* @return {String} a string-representation of a sub signature packet (See {@link http://tools.ietf.org/html/rfc4880#section-5.2.3.1|RFC 4880 5.2.3.1})
*/
function write_sub_packet(type, data) {
var result = "";
result += packet.writeSimpleLength(data.length + 1);
result += String.fromCharCode(type);
result += data;
return result;
}
// V4 signature sub packets
Signature.prototype.read_sub_packet = function (bytes) {
var mypos = 0;
function read_array(prop, bytes) {
this[prop] = [];
for (var i = 0; i < bytes.length; i++) {
this[prop].push(bytes.charCodeAt(i));
}
}
// The leftwost bit denotes a "critical" packet, but we ignore it.
var type = bytes.charCodeAt(mypos++) & 0x7F;
var seconds;
// subpacket type
switch (type) {
case 2:
// Signature Creation Time
this.created = util.readDate(bytes.substr(mypos));
break;
case 3:
// Signature Expiration Time in seconds
seconds = util.readNumber(bytes.substr(mypos));
this.signatureNeverExpires = seconds === 0;
this.signatureExpirationTime = seconds;
break;
case 4:
// Exportable Certification
this.exportable = bytes.charCodeAt(mypos++) == 1;
break;
case 5:
// Trust Signature
this.trustLevel = bytes.charCodeAt(mypos++);
this.trustAmount = bytes.charCodeAt(mypos++);
break;
case 6:
// Regular Expression
this.regularExpression = bytes.substr(mypos);
break;
case 7:
// Revocable
this.revocable = bytes.charCodeAt(mypos++) == 1;
break;
case 9:
// Key Expiration Time in seconds
seconds = util.readNumber(bytes.substr(mypos));
this.keyExpirationTime = seconds;
this.keyNeverExpires = seconds === 0;
break;
case 11:
// Preferred Symmetric Algorithms
this.preferredSymmetricAlgorithms = [];
while (mypos != bytes.length) {
this.preferredSymmetricAlgorithms.push(bytes.charCodeAt(mypos++));
}
break;
case 12:
// Revocation Key
// (1 octet of class, 1 octet of public-key algorithm ID, 20
// octets of
// fingerprint)
this.revocationKeyClass = bytes.charCodeAt(mypos++);
this.revocationKeyAlgorithm = bytes.charCodeAt(mypos++);
this.revocationKeyFingerprint = bytes.substr(mypos, 20);
break;
case 16:
// Issuer
this.issuerKeyId.read(bytes.substr(mypos));
break;
case 20:
// Notation Data
// We don't know how to handle anything but a text flagged data.
if (bytes.charCodeAt(mypos) == 0x80) {
// We extract key/value tuple from the byte stream.
mypos += 4;
var m = util.readNumber(bytes.substr(mypos, 2));
mypos += 2;
var n = util.readNumber(bytes.substr(mypos, 2));
mypos += 2;
var name = bytes.substr(mypos, m),
value = bytes.substr(mypos + m, n);
this.notation = this.notation || {};
this.notation[name] = value;
} else throw new Error("Unsupported notation flag.");
break;
case 21:
// Preferred Hash Algorithms
read_array.call(this, 'preferredHashAlgorithms', bytes.substr(mypos));
break;
case 22:
// Preferred Compression Algorithms
read_array.call(this, 'preferredCompressionAlgorithms ', bytes.substr(mypos));
break;
case 23:
// Key Server Preferences
read_array.call(this, 'keyServerPreferencess', bytes.substr(mypos));
break;
case 24:
// Preferred Key Server
this.preferredKeyServer = bytes.substr(mypos);
break;
case 25:
// Primary User ID
this.isPrimaryUserID = bytes[mypos++] !== 0;
break;
case 26:
// Policy URI
this.policyURI = bytes.substr(mypos);
break;
case 27:
// Key Flags
read_array.call(this, 'keyFlags', bytes.substr(mypos));
break;
case 28:
// Signer's User ID
this.signersUserId += bytes.substr(mypos);
break;
case 29:
// Reason for Revocation
this.reasonForRevocationFlag = bytes.charCodeAt(mypos++);
this.reasonForRevocationString = bytes.substr(mypos);
break;
case 30:
// Features
read_array.call(this, 'features', bytes.substr(mypos));
break;
case 31:
// Signature Target
// (1 octet public-key algorithm, 1 octet hash algorithm, N octets hash)
this.signatureTargetPublicKeyAlgorithm = bytes.charCodeAt(mypos++);
this.signatureTargetHashAlgorithm = bytes.charCodeAt(mypos++);
var len = crypto.getHashByteLength(this.signatureTargetHashAlgorithm);
this.signatureTargetHash = bytes.substr(mypos, len);
break;
case 32:
// Embedded Signature
this.embeddedSignature = new Signature();
this.embeddedSignature.read(bytes.substr(mypos));
break;
default:
throw new Error("Unknown signature subpacket type " + type + " @:" + mypos);
}
};
// Produces data to produce signature on
Signature.prototype.toSign = function (type, data) {
var t = enums.signature;
switch (type) {
case t.binary:
case t.text:
return data.getBytes();
case t.standalone:
return '';
case t.cert_generic:
case t.cert_persona:
case t.cert_casual:
case t.cert_positive:
case t.cert_revocation:
var packet, tag;
if (data.userid !== undefined) {
tag = 0xB4;
packet = data.userid;
} else if (data.userattribute !== undefined) {
tag = 0xD1;
packet = data.userattribute;
} else throw new Error('Either a userid or userattribute packet needs to be ' +
'supplied for certification.');
var bytes = packet.write();
if (this.version == 4) {
return this.toSign(t.key, data) +
String.fromCharCode(tag) +
util.writeNumber(bytes.length, 4) +
bytes;
} else if (this.version == 3) {
return this.toSign(t.key, data) +
bytes;
}
break;
case t.subkey_binding:
case t.subkey_revocation:
case t.key_binding:
return this.toSign(t.key, data) + this.toSign(t.key, {
key: data.bind
});
case t.key:
if (data.key === undefined)
throw new Error('Key packet is required for this sigtature.');
return data.key.writeOld();
case t.key_revocation:
return this.toSign(t.key, data);
case t.timestamp:
return '';
case t.third_party:
throw new Error('Not implemented');
default:
throw new Error('Unknown signature type.');
}
};
Signature.prototype.calculateTrailer = function () {
// calculating the trailer
var trailer = '';
// V3 signatures don't have a trailer
if (this.version == 3) return trailer;
trailer += String.fromCharCode(4); // Version
trailer += String.fromCharCode(0xFF);
trailer += util.writeNumber(this.signatureData.length, 4);
return trailer;
};
/**
* verifys the signature packet. Note: not signature types are implemented
* @param {String|Object} data data which on the signature applies
* @param {module:packet/public_subkey|module:packet/public_key} key the public key to verify the signature
* @return {boolean} True if message is verified, else false.
*/
Signature.prototype.verify = function (key, data) {
var signatureType = enums.write(enums.signature, this.signatureType),
publicKeyAlgorithm = enums.write(enums.publicKey, this.publicKeyAlgorithm),
hashAlgorithm = enums.write(enums.hash, this.hashAlgorithm);
var bytes = this.toSign(signatureType, data),
trailer = this.calculateTrailer();
var mpicount = 0;
// Algorithm-Specific Fields for RSA signatures:
// - multiprecision number (MPI) of RSA signature value m**d mod n.
if (publicKeyAlgorithm > 0 && publicKeyAlgorithm < 4)
mpicount = 1;
// Algorithm-Specific Fields for DSA signatures:
// - MPI of DSA value r.
// - MPI of DSA value s.
else if (publicKeyAlgorithm == 17)
mpicount = 2;
var mpi = [],
i = 0;
for (var j = 0; j < mpicount; j++) {
mpi[j] = new type_mpi();
i += mpi[j].read(this.signature.substr(i));
}
this.verified = crypto.signature.verify(publicKeyAlgorithm,
hashAlgorithm, mpi, key.mpi,
bytes + this.signatureData + trailer);
return this.verified;
};
/**
* Verifies signature expiration date
* @return {Boolean} true if expired
*/
Signature.prototype.isExpired = function () {
if (!this.signatureNeverExpires) {
return Date.now() > (this.created.getTime() + this.signatureExpirationTime*1000);
}
return false;
};
/**
* Fix custom types after cloning
*/
Signature.prototype.postCloneTypeFix = function() {
this.issuerKeyId = type_keyid.fromClone(this.issuerKeyId);
};
</code></pre>
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