3680695a69
Rename resources to dist. Eliminate keyring bundle and expose keyring class in openpgp module. Add mochaTest grunt task to run node server-side tests. Add node_pack grunt task to create npm package into dist and install it for testing. Add node_store config property which specifies location of localStorage emulation when using node. Add repository info to package.json. Move util.js to src directory from util since it is the only file there. Rename class properties in openpgp to the new class names.
153 lines
9.6 KiB
HTML
153 lines
9.6 KiB
HTML
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<title>JSDoc: Source: type/mpi.js</title>
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<h1 class="page-title">Source: type/mpi.js</h1>
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<section>
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<article>
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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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// Hint: We hold our MPIs as an array of octets in big endian format preceeding a two
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// octet scalar: MPI: [a,b,c,d,e,f]
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// - MPI size: (a << 8) | b
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// - MPI = c | d << 8 | e << ((MPI.length -2)*8) | f ((MPI.length -2)*8)
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/**
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* Implementation of type MPI ({@link http://tools.ietf.org/html/rfc4880#section-3.2|RFC4880 3.2})<br/>
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* <br/>
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* Multiprecision integers (also called MPIs) are unsigned integers used
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* to hold large integers such as the ones used in cryptographic
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* calculations.
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* An MPI consists of two pieces: a two-octet scalar that is the length
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* of the MPI in bits followed by a string of octets that contain the
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* actual integer.
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* @requires crypto/public_key/jsbn
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* @requires util
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* @module type/mpi
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*/
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module.exports = MPI;
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var BigInteger = require('../crypto/public_key/jsbn.js'),
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util = require('../util.js');
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/**
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* @constructor
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*/
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function MPI() {
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/** An implementation dependent integer */
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this.data = null;
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}
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/**
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* Parsing function for a mpi ({@link http://tools.ietf.org/html/rfc4880#section3.2|RFC 4880 3.2}).
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* @param {String} input Payload of mpi data
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* @return {Integer} Length of data read
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*/
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MPI.prototype.read = function (bytes) {
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var bits = (bytes.charCodeAt(0) << 8) | bytes.charCodeAt(1);
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// Additional rules:
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//
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// The size of an MPI is ((MPI.length + 7) / 8) + 2 octets.
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//
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// The length field of an MPI describes the length starting from its
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// most significant non-zero bit. Thus, the MPI [00 02 01] is not
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// formed correctly. It should be [00 01 01].
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// TODO: Verification of this size method! This size calculation as
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// specified above is not applicable in JavaScript
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var bytelen = Math.ceil(bits / 8);
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var raw = bytes.substr(2, bytelen);
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this.fromBytes(raw);
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return 2 + bytelen;
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};
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MPI.prototype.fromBytes = function (bytes) {
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this.data = new BigInteger(util.hexstrdump(bytes), 16);
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};
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MPI.prototype.toBytes = function () {
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return this.write().substr(2);
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};
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MPI.prototype.byteLength = function () {
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return this.toBytes().length;
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};
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/**
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* Converts the mpi object to a string as specified in {@link http://tools.ietf.org/html/rfc4880#section-3.2|RFC4880 3.2}
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* @return {String} mpi Byte representation
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*/
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MPI.prototype.write = function () {
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return this.data.toMPI();
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};
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MPI.prototype.toBigInteger = function () {
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return this.data.clone();
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};
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MPI.prototype.fromBigInteger = function (bn) {
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this.data = bn.clone();
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};
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</code></pre>
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</article>
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