277 lines
14 KiB
HTML
277 lines
14 KiB
HTML
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<title>JSDoc: Source: crypto/crypto.js</title>
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<h1 class="page-title">Source: crypto/crypto.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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// The GPG4Browsers crypto interface
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/**
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* @requires crypto/cipher
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* @requires crypto/public_key
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* @requires crypto/random
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* @requires type/mpi
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* @module crypto/crypto
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*/
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var random = require('./random.js'),
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cipher = require('./cipher'),
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publicKey = require('./public_key'),
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type_mpi = require('../type/mpi.js');
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module.exports = {
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/**
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* Encrypts data using the specified public key multiprecision integers
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* and the specified algorithm.
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* @param {Integer} algo Algorithm to be used (See RFC4880 9.1)
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* @param {Array<module:type/mpi>} publicMPIs Algorithm dependent multiprecision integers
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* @param {module:type/mpi} data Data to be encrypted as MPI
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* @return {Array<module:type/mpi>} if RSA an module:type/mpi;
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* if elgamal encryption an array of two module:type/mpi is returned; otherwise null
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*/
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publicKeyEncrypt: function(algo, publicMPIs, data) {
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var result = (function() {
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var m;
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switch (algo) {
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case 'rsa_encrypt':
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case 'rsa_encrypt_sign':
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var rsa = new publicKey.rsa();
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var n = publicMPIs[0].toBigInteger();
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var e = publicMPIs[1].toBigInteger();
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m = data.toBigInteger();
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return [rsa.encrypt(m, e, n)];
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case 'elgamal':
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var elgamal = new publicKey.elgamal();
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var p = publicMPIs[0].toBigInteger();
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var g = publicMPIs[1].toBigInteger();
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var y = publicMPIs[2].toBigInteger();
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m = data.toBigInteger();
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return elgamal.encrypt(m, g, p, y);
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default:
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return [];
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}
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})();
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return result.map(function(bn) {
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var mpi = new type_mpi();
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mpi.fromBigInteger(bn);
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return mpi;
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});
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},
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/**
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* Decrypts data using the specified public key multiprecision integers of the private key,
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* the specified secretMPIs of the private key and the specified algorithm.
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* @param {Integer} algo Algorithm to be used (See RFC4880 9.1)
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* @param {Array<module:type/mpi>} publicMPIs Algorithm dependent multiprecision integers
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* of the public key part of the private key
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* @param {Array<module:type/mpi>} secretMPIs Algorithm dependent multiprecision integers
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* of the private key used
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* @param {module:type/mpi} data Data to be encrypted as MPI
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* @return {module:type/mpi} returns a big integer containing the decrypted data; otherwise null
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*/
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publicKeyDecrypt: function(algo, keyIntegers, dataIntegers) {
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var p;
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var bn = (function() {
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switch (algo) {
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case 'rsa_encrypt_sign':
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case 'rsa_encrypt':
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var rsa = new publicKey.rsa();
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// 0 and 1 are the public key.
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var d = keyIntegers[2].toBigInteger();
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p = keyIntegers[3].toBigInteger();
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var q = keyIntegers[4].toBigInteger();
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var u = keyIntegers[5].toBigInteger();
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var m = dataIntegers[0].toBigInteger();
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return rsa.decrypt(m, d, p, q, u);
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case 'elgamal':
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var elgamal = new publicKey.elgamal();
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var x = keyIntegers[3].toBigInteger();
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var c1 = dataIntegers[0].toBigInteger();
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var c2 = dataIntegers[1].toBigInteger();
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p = keyIntegers[0].toBigInteger();
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return elgamal.decrypt(c1, c2, p, x);
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default:
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return null;
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}
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})();
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var result = new type_mpi();
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result.fromBigInteger(bn);
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return result;
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},
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/** Returns the number of integers comprising the private key of an algorithm
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* @param {String} algo The public key algorithm
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* @return {Integer} The number of integers.
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*/
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getPrivateMpiCount: function(algo) {
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switch (algo) {
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case 'rsa_encrypt':
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case 'rsa_encrypt_sign':
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case 'rsa_sign':
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// Algorithm-Specific Fields for RSA secret keys:
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// - multiprecision integer (MPI) of RSA secret exponent d.
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// - MPI of RSA secret prime value p.
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// - MPI of RSA secret prime value q (p < q).
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// - MPI of u, the multiplicative inverse of p, mod q.
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return 4;
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case 'elgamal':
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// Algorithm-Specific Fields for Elgamal secret keys:
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// - MPI of Elgamal secret exponent x.
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return 1;
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case 'dsa':
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// Algorithm-Specific Fields for DSA secret keys:
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// - MPI of DSA secret exponent x.
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return 1;
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default:
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throw new Error('Unknown algorithm');
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}
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},
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getPublicMpiCount: function(algo) {
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// - A series of multiprecision integers comprising the key material:
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// Algorithm-Specific Fields for RSA public keys:
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// - a multiprecision integer (MPI) of RSA public modulus n;
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// - an MPI of RSA public encryption exponent e.
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switch (algo) {
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case 'rsa_encrypt':
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case 'rsa_encrypt_sign':
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case 'rsa_sign':
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return 2;
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// Algorithm-Specific Fields for Elgamal public keys:
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// - MPI of Elgamal prime p;
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// - MPI of Elgamal group generator g;
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// - MPI of Elgamal public key value y (= g**x mod p where x is secret).
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case 'elgamal':
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return 3;
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// Algorithm-Specific Fields for DSA public keys:
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// - MPI of DSA prime p;
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// - MPI of DSA group order q (q is a prime divisor of p-1);
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// - MPI of DSA group generator g;
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// - MPI of DSA public-key value y (= g**x mod p where x is secret).
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case 'dsa':
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return 4;
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default:
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throw new Error('Unknown algorithm.');
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}
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},
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generateMpi: function(algo, bits) {
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var result = (function() {
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switch (algo) {
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case 'rsa_encrypt':
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case 'rsa_encrypt_sign':
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case 'rsa_sign':
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//remember "publicKey" refers to the crypto/public_key dir
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var rsa = new publicKey.rsa();
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var keyObject = rsa.generate(bits, "10001");
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var output = [];
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output.push(keyObject.n);
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output.push(keyObject.ee);
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output.push(keyObject.d);
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output.push(keyObject.p);
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output.push(keyObject.q);
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output.push(keyObject.u);
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return output;
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default:
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throw new Error('Unsupported algorithm for key generation.');
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}
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})();
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return result.map(function(bn) {
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var mpi = new type_mpi();
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mpi.fromBigInteger(bn);
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return mpi;
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});
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},
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/**
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* generate random byte prefix as string for the specified algorithm
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @return {String} Random bytes with length equal to the block
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* size of the cipher
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*/
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getPrefixRandom: function(algo) {
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return random.getRandomBytes(cipher[algo].blockSize);
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},
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/**
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* Generating a session key for the specified symmetric algorithm
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @return {String} Random bytes as a string to be used as a key
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*/
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generateSessionKey: function(algo) {
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return random.getRandomBytes(cipher[algo].keySize);
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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 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