23295342fc
work correctly with utf8 strings. Fixeda visibility issue with the testing suite and added relevant unit tests.
185 lines
11 KiB
HTML
185 lines
11 KiB
HTML
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<title>JSDoc: Source: type/openpgp.type.mpi.js</title>
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<h1 class="page-title">Source: type/openpgp.type.mpi.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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// 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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* @class
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* @classdescImplementation of type MPI (RFC4880 3.2)
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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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*/
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function openpgp_type_mpi() {
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this.MPI = null;
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this.mpiBitLength = null;
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this.mpiByteLength = null;
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this.data = null;
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/**
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* Parsing function for a mpi (RFC 4880 3.2).
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* @param {String} input Payload of mpi data
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* @param {Integer} position Position to start reading from the input
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* string
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* @param {Integer} len Length of the packet or the remaining length of
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* input at position
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* @return {openpgp_type_mpi} Object representation
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*/
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function read(input, position, len) {
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var mypos = position;
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this.mpiBitLength = (input[mypos++].charCodeAt() << 8) | input[mypos++].charCodeAt();
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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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this.mpiByteLength = (this.mpiBitLength - (this.mpiBitLength % 8)) / 8;
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if (this.mpiBitLength % 8 != 0)
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this.mpiByteLength++;
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this.MPI = input.substring(mypos,mypos+this.mpiByteLength);
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this.data = input.substring(position, position+2+this.mpiByteLength);
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this.packetLength = this.mpiByteLength +2;
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return this;
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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 mpi
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*/
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function toString() {
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var r = " MPI("+this.mpiBitLength+"b/"+this.mpiByteLength+"B) : 0x";
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r+=util.hexstrdump(this.MPI);
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return r+'\n';
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}
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/**
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* Converts the mpi to an BigInteger object
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* @return {BigInteger}
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*/
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function getBigInteger() {
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return new BigInteger(util.hexstrdump(this.MPI),16);
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}
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function getBits(num) {
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for (var i = 0; i < 9; i++)
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if (num >> i == 0)
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return i;
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}
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/**
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* Gets the length of the mpi in bytes
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* @return {Integer} Mpi byte length
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*/
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function getByteLength() {
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return this.mpiByteLength;
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}
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/**
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* Creates an mpi from the specified string
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* @param {String} data Data to read the mpi from
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* @return {openpgp_type_mpi}
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*/
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function create(data) {
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this.MPI = data;
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this.mpiBitLength = (data.length -1) *8 + getBits(data.charCodeAt(0));
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this.mpiByteLength = data.length;
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return this;
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}
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/**
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* Converts the mpi object to a string as specified in RFC4880 3.2
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* @return {String} mpi Byte representation
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*/
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function toBin() {
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var result = String.fromCharCode((this.mpiBitLength >> 8) & 0xFF);
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result += String.fromCharCode(this.mpiBitLength & 0xFF);
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result += this.MPI;
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return result;
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}
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this.read = read;
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this.toBigInteger = getBigInteger;
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this.toString = toString;
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this.create = create;
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this.toBin = toBin;
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this.getByteLength = getByteLength;
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}
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</code></pre>
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</article>
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