236 lines
12 KiB
HTML
236 lines
12 KiB
HTML
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<title>JSDoc: Source: packet/public_key.js</title>
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<h1 class="page-title">Source: packet/public_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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* Implementation of the Key Material Packet (Tag 5,6,7,14)<br/>
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* <br/>
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* {@link http://tools.ietf.org/html/rfc4880#section-5.5|RFC4480 5.5}:
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* A key material packet contains all the information about a public or
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* private key. There are four variants of this packet type, and two
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* major versions. Consequently, this section is complex.
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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
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*/
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module.exports = PublicKey;
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var util = require('../util'),
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type_mpi = require('../type/mpi.js'),
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type_keyid = require('../type/keyid.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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function PublicKey() {
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this.version = 4;
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/** Key creation date.
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* @type {Date} */
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this.created = new Date();
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/** A list of multiprecision integers
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* @type {module:type/mpi} */
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this.mpi = [];
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/** Public key algorithm
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* @type {module:enums.publicKey} */
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this.algorithm = 'rsa_sign';
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// time in days (V3 only)
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this.expirationTimeV3 = 0;
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}
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/**
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* Internal Parser for public keys as specified in {@link http://tools.ietf.org/html/rfc4880#section-5.5.2|RFC 4880 section 5.5.2 Public-Key Packet Formats}
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* called by read_tag<num>
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* @param {String} input Input string to read the packet from
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* @return {Object} This object with attributes set by the parser
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*/
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PublicKey.prototype.read = function (bytes) {
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var pos = 0;
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// A one-octet version number (3 or 4).
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this.version = bytes.charCodeAt(pos++);
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if (this.version == 3 || this.version == 4) {
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// - A four-octet number denoting the time that the key was created.
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this.created = util.readDate(bytes.substr(pos, 4));
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pos += 4;
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if (this.version == 3) {
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// - A two-octet number denoting the time in days that this key is
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// valid. If this number is zero, then it does not expire.
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this.expirationTimeV3 = util.readNumber(bytes.substr(pos, 2));
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pos += 2;
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}
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// - A one-octet number denoting the public-key algorithm of this key.
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this.algorithm = enums.read(enums.publicKey, bytes.charCodeAt(pos++));
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var mpicount = crypto.getPublicMpiCount(this.algorithm);
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this.mpi = [];
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var bmpi = bytes.substr(pos);
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var p = 0;
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for (var i = 0; i < mpicount && p < bmpi.length; i++) {
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this.mpi[i] = new type_mpi();
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p += this.mpi[i].read(bmpi.substr(p));
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if (p > bmpi.length) {
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throw new Error('Error reading MPI @:' + p);
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}
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}
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return p + 6;
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} else {
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throw new Error('Version ' + version + ' of the key packet is unsupported.');
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}
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};
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/**
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* Alias of read()
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* @see module:packet/public_key~PublicKey#read
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*/
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PublicKey.prototype.readPublicKey = PublicKey.prototype.read;
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/**
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* Same as write_private_key, but has less information because of
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* public key.
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* @return {Object} {body: [string]OpenPGP packet body contents,
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* header: [string] OpenPGP packet header, string: [string] header+body}
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*/
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PublicKey.prototype.write = function () {
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// Version
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var result = String.fromCharCode(this.version);
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result += util.writeDate(this.created);
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if (this.version == 3) {
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result += util.writeNumber(this.expirationTimeV3, 2);
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}
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result += String.fromCharCode(enums.write(enums.publicKey, this.algorithm));
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var mpicount = crypto.getPublicMpiCount(this.algorithm);
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for (var i = 0; i < mpicount; i++) {
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result += this.mpi[i].write();
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}
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return result;
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};
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/**
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* Alias of write()
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* @see module:packet/public_key~PublicKey#write
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*/
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PublicKey.prototype.writePublicKey = PublicKey.prototype.write;
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/**
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* Write an old version packet - it's used by some of the internal routines.
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*/
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PublicKey.prototype.writeOld = function () {
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var bytes = this.writePublicKey();
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return String.fromCharCode(0x99) +
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util.writeNumber(bytes.length, 2) +
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bytes;
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};
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/**
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* Calculates the key id of the key
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* @return {String} A 8 byte key id
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*/
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PublicKey.prototype.getKeyId = function () {
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var keyid = new type_keyid();
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if (this.version == 4) {
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keyid.read(this.getFingerprint().substr(12, 8));
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} else if (this.version == 3) {
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keyid.read(this.mpi[0].write().substr(-8));
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}
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return keyid;
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};
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/**
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* Calculates the fingerprint of the key
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* @return {String} A string containing the fingerprint
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*/
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PublicKey.prototype.getFingerprint = function () {
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var toHash = '';
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if (this.version == 4) {
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toHash = this.writeOld();
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return crypto.hash.sha1(toHash);
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} else if (this.version == 3) {
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var mpicount = crypto.getPublicMpiCount(this.algorithm);
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for (var i = 0; i < mpicount; i++) {
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toHash += this.mpi[i].toBytes();
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}
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return crypto.hash.md5(toHash);
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}
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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>Modules</h3><ul><li><a href="module-armor.html">armor</a></li><li><a href="module-cleartext.html">cleartext</a></li><li><a href="module-config.html">config</a></li><li><a href="config.html">config/config</a></li><li><a href="localStorage.html">config/localStorage</a></li><li><a href="module-crypto.html">crypto</a></li><li><a href="cfb.html">crypto/cfb</a></li><li><a href="cipher.html">crypto/cipher</a></li><li><a href="aes.html">crypto/cipher/aes</a></li><li><a href="blowfish.html">crypto/cipher/blowfish</a></li><li><a href="cast5.html">crypto/cipher/cast5</a></li><li><a href="des.html">crypto/cipher/des</a></li><li><a href="twofish.html">crypto/cipher/twofish</a></li><li><a href="crypto.html">crypto/crypto</a></li><li><a href="hash.html">crypto/hash</a></li><li><a href="md5.html">crypto/hash/md5</a></li><li><a href="ripe-md.html">crypto/hash/ripe-md</a></li><li><a href="sha.html">crypto/hash/sha</a></li><li><a href="pkcs1.html">crypto/pkcs1</a></li><li><a href="public_key.html">crypto/public_key</a></li><li><a href="dsa.html">crypto/public_key/dsa</a></li><li><a href="elgamal.html">crypto/public_key/elgamal</a></li><li><a href="jsbn.html">crypto/public_key/jsbn</a></li><li><a href="rsa.html">crypto/public_key/rsa</a></li><li><a href="random.html">crypto/random</a></li><li><a href="signature.html">crypto/signature</a></li><li><a href="armor.html">encoding/armor</a></li><li><a href="base64.html">encoding/base64</a></li><li><a href="module-enums.html">enums</a></li><li><a href="module-key.html">key</a></li><li><a href="module-keyid.html">keyid</a></li><li><a href="keyring.html">keyring/keyring</a></li><li><a href="localstore.html">keyring/localstore</a></li><li><a href="module-message.html">message</a></li><li><a href="module-mpi.html">mpi</a></li><li><a href="module-openpgp.html">openpgp</a></li><li><a href="module-packet.html">packet</a></li><li><a href="compressed.html">packet/compressed</a></li><li><a href="literal.html">packet/literal</a></li><li><a href="marker.html">packet/marker</a></li><li><a href="one_pass_signature.html">packet/one_pass_signature</a></li><li><a href="packet.html">packet/packet</a></li><li><a href="packetlist.html">packet/packetlist</a></li><li><a href="public_key_.html">packet/public_key</a></li><li><a href="public_key_encrypted_session_key.html">packet/public_key_encrypted_session_key</a></li><li><a href="public_subkey.html">packet/public_subkey</a></li><li><a href="secret_key.html">packet/secret_key</a></li><li><a href="secret_subkey.html">packet/secret_subkey</a></li><li><a href="signature_.html">packet/signature</a></li><li><a href="sym_encrypted_integrity_protected.html">packet/sym_encrypted_integrity_protected</a></li><li><a href="sym_encrypted_session_key.html">packet/sym_encrypted_session_key</a></li><li><a href="symmetrically_encrypted.html">packet/symmetrically_encrypted</a></li><li><a href="trust.html">packet/trust</a></li><li><a href="user_attribute.html">packet/user_attribute</a></li><li><a href="userid.html">packet/userid</a></li><li><a href="module-s2k.html">s2k</a></li><li><a href="keyid.html">type/keyid</a></li><li><a href="mpi.html">type/mpi</a></li><li><a href="s2k.html">type/s2k</a></li><li><a href="module-util.html">util</a></li><li><a href="util.html">util/util</a></li></ul><h3>Classes</h3><ul><li><a href="JXG.Util.html">JXG.Util</a></li><li><a href="module-cleartext-CleartextMessage.html">cleartext~CleartextMessage</a></li><li><a href="localStorage-LocalStorage.html">config/localStorage~LocalStorage</a></li><li><a href="keyring-Keyring.html">keyring/keyring~Keyring</a></li><li><a href="module-key-Key.html">key~Key</a></li><li><a href="module-key-SubKey.html">key~SubKey</a></li><li><a href="module-key-User.html">key~User</a></li><li><a href="module-message-Message.html">message~Message</a></li><li><a href="compressed-Compressed.html">packet/compressed~Compressed</a></li><li><a href="literal-Literal.html">packet/literal~Literal</a></li><li><a href="marker-Marker.html">packet/marker~Marker</a></li><li><a href="one_pass_signature-OnePassSignature.html">packet/one_pass_signature~OnePassSignature</a></li><li><a href="packetlist-Packetlist.html">packet/packetlist~Packetlist</a></li><li><a href="public_key_encrypted_session_key-PublicKeyEncryptedSessionKey.html">packet/public_key_encrypted_session_key~PublicKeyEncryptedSessionKey</a></li><li><a href="public_key-PublicKey.html">packet/public_key~PublicKey</a></li><li><a href="public_subkey-PublicSubkey.html">packet/public_subkey~PublicSubkey</a></li><li><a href="secret_key-SecretKey.html">packet/secret_key~SecretKey</a></li><li><a href="secret_subkey-SecretSubkey.html">packet/secret_subkey~SecretSubkey</a></li><li><a href="signature-Signature.html">packet/signature~Signature</a></li><li><a href="sym_encrypted_integrity_protected-SymEncryptedIntegrityProtected.html">packet/sym_encrypted_integrity_protected~SymEncryptedIntegrityProtected</a></li><li><a href="sym_encrypted_session_key-SymEncryptedSessionKey.html">packet/sym_encrypted_session_key~SymEncryptedSessionKey</a></li><li><a href="symmetrically_encrypted-SymmetricallyEncrypted.html">packet/symmetrically_encrypted~SymmetricallyEncrypted</a></li><li><a href="trust-Trust.html">packet/trust~Trust</a></li><li><a href="user_attribute-UserAttribute.html">packet/user_attribute~UserAttribute</a></li><li><a href="userid-Userid.html">packet/userid~Userid</a></li><li><a href="keyid-Keyid.html">type/keyid~Keyid</a></li><li><a href="mpi-Mpi.html">type/mpi~Mpi</a></li><li><a href="s2k-S2k.html">type/s2k~S2k</a></li></ul>
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