<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: packet/public_key.js</title>
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>
<body>
<div id="main">
<h1 class="page-title">Source: packet/public_key.js</h1>
<section>
<article>
<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 Key Material Packet (Tag 5,6,7,14)<br/>
* <br/>
* RFC4480 5.5:
* A key material packet contains all the information about a public or
* private key. There are four variants of this packet type, and two
* major versions. Consequently, this section is complex.
* @requires crypto
* @requires enums
* @requires type/keyid
* @requires type/mpi
* @requires util
* @module packet/public_key
*/
var util = require('../util'),
type_mpi = require('../type/mpi.js'),
type_keyid = require('../type/keyid.js'),
enums = require('../enums.js'),
crypto = require('../crypto');
/**
* @constructor
*/
module.exports = function public_key() {
this.version = 4;
/** Key creation date.
* @type {Date} */
this.created = new Date();
/** A list of multiprecision integers
* @type {module:type/mpi} */
this.mpi = [];
/** Public key algorithm
* @type {module:enums.publicKey} */
this.algorithm = 'rsa_sign';
// time in days (V3 only)
this.expirationTimeV3 = 0;
/**
* Internal Parser for public keys as specified in RFC 4880 section
* 5.5.2 Public-Key Packet Formats
* called by read_tag<num>
* @param {String} input Input string to read the packet from
* @return {Object} This object with attributes set by the parser
*/
this.read = function (bytes) {
var pos = 0;
// A one-octet version number (3 or 4).
this.version = bytes.charCodeAt(pos++);
if (this.version == 3 || this.version == 4) {
// - A four-octet number denoting the time that the key was created.
this.created = util.readDate(bytes.substr(pos, 4));
pos += 4;
if (this.version == 3) {
// - A two-octet number denoting the time in days that this key is
// valid. If this number is zero, then it does not expire.
this.expirationTimeV3 = util.readNumber(bytes.substr(pos, 2));
pos += 2;
}
// - A one-octet number denoting the public-key algorithm of this key.
this.algorithm = enums.read(enums.publicKey, bytes.charCodeAt(pos++));
var mpicount = crypto.getPublicMpiCount(this.algorithm);
this.mpi = [];
var bmpi = bytes.substr(pos);
var p = 0;
for (var i = 0; i < mpicount && p < bmpi.length; i++) {
this.mpi[i] = new type_mpi();
p += this.mpi[i].read(bmpi.substr(p))
if (p > bmpi.length) {
throw new Error('Error reading MPI @:' + p);
}
}
return p + 6;
} else {
throw new Error('Version ' + version + ' of the key packet is unsupported.');
}
};
/**
* Alias of read()
* @function module:packet/public_key#readPublicKey
* @see module:packet/public_key#read
*/
this.readPublicKey = this.read;
/**
* Same as write_private_key, but has less information because of
* public key.
* @return {Object} {body: [string]OpenPGP packet body contents,
* header: [string] OpenPGP packet header, string: [string] header+body}
*/
this.write = function () {
// Version
var result = String.fromCharCode(this.version);
result += util.writeDate(this.created);
if (this.version == 3) {
result += util.writeNumber(this.expirationTimeV3, 2);
}
result += String.fromCharCode(enums.write(enums.publicKey, this.algorithm));
var mpicount = crypto.getPublicMpiCount(this.algorithm);
for (var i = 0; i < mpicount; i++) {
result += this.mpi[i].write();
}
return result;
};
/**
* Alias of write()
* @function module:packet/public_key#writePublicKey
* @see module:packet/public_key#write
*/
this.writePublicKey = this.write;
/**
* Write an old version packet - it's used by some of the internal routines.
*/
this.writeOld = function () {
var bytes = this.writePublicKey();
return String.fromCharCode(0x99) +
util.writeNumber(bytes.length, 2) +
bytes;
};
/**
* Calculates the key id of the key
* @return {String} A 8 byte key id
*/
this.getKeyId = function () {
var keyid = new type_keyid();
if (this.version == 4) {
keyid.read(this.getFingerprint().substr(12, 8));
} else if (this.version == 3) {
keyid.read(this.mpi[0].write().substr(-8));
}
return keyid;
};
/**
* Calculates the fingerprint of the key
* @return {String} A string containing the fingerprint
*/
this.getFingerprint = function () {
var toHash = '';
if (this.version == 4) {
toHash = this.writeOld();
return crypto.hash.sha1(toHash);
} else if (this.version == 3) {
var mpicount = crypto.getPublicMpiCount(this.algorithm);
for (var i = 0; i < mpicount; i++) {
toHash += this.mpi[i].toBytes();
}
return crypto.hash.md5(toHash)
}
};
};
</code></pre>
</article>
</section>
</div>
<nav>
<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">Util</a></li><li><a href="module-cleartext-CleartextMessage.html">CleartextMessage</a></li><li><a href="module-key-Key.html">Key</a></li><li><a href="module-key-SubKey.html">SubKey</a></li><li><a href="module-key-User.html">User</a></li><li><a href="module-message-Message.html">Message</a></li></ul>
</nav>
<br clear="both">
<footer>
Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.2.0</a> on Thu Jan 02 2014 13:02:39 GMT-0800 (PST)
</footer>
<script> prettyPrint(); </script>
<script src="scripts/linenumber.js"> </script>
</body>
</html>