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: ciphers/asymmetric/rsa.js</title>
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<h1 class="page-title">Source: ciphers/asymmetric/rsa.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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//
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// RSA implementation
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function SecureRandom(){
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function nextBytes(byteArray){
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for(var n = 0; n < byteArray.length;n++){
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byteArray[n] = openpgp_crypto_getSecureRandomOctet();
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}
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}
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this.nextBytes = nextBytes;
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}
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function RSA() {
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/**
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* This function uses jsbn Big Num library to decrypt RSA
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* @param m
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* message
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* @param d
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* RSA d as BigInteger
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* @param p
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* RSA p as BigInteger
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* @param q
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* RSA q as BigInteger
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* @param u
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* RSA u as BigInteger
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* @return {BigInteger} The decrypted value of the message
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*/
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function decrypt(m, d, p, q, u) {
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var xp = m.mod(p).modPow(d.mod(p.subtract(BigInteger.ONE)), p);
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var xq = m.mod(q).modPow(d.mod(q.subtract(BigInteger.ONE)), q);
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util.print_debug("rsa.js decrypt\nxpn:"+util.hexstrdump(xp.toMPI())+"\nxqn:"+util.hexstrdump(xq.toMPI()));
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var t = xq.subtract(xp);
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if (t[0] == 0) {
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t = xp.subtract(xq);
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t = t.multiply(u).mod(q);
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t = q.subtract(t);
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} else {
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t = t.multiply(u).mod(q);
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}
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return t.multiply(p).add(xp);
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}
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/**
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* encrypt message
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* @param m message as BigInteger
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* @param e public MPI part as BigInteger
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* @param n public MPI part as BigInteger
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* @return BigInteger
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*/
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function encrypt(m,e,n) {
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return m.modPowInt(e, n);
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}
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/* Sign and Verify */
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function sign(m,d,n) {
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return m.modPow(d, n);
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}
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function verify(x,e,n) {
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return x.modPowInt(e, n);
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}
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// "empty" RSA key constructor
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function keyObject() {
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this.n = null;
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this.e = 0;
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this.ee = null;
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this.d = null;
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this.p = null;
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this.q = null;
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this.dmp1 = null;
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this.dmq1 = null;
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this.u = null;
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}
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// Generate a new random private key B bits long, using public expt E
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function generate(B,E) {
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var key = new keyObject();
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var rng = new SecureRandom();
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var qs = B>>1;
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key.e = parseInt(E,16);
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key.ee = new BigInteger(E,16);
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for(;;) {
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for(;;) {
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key.p = new BigInteger(B-qs,1,rng);
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if(key.p.subtract(BigInteger.ONE).gcd(key.ee).compareTo(BigInteger.ONE) == 0 && key.p.isProbablePrime(10)) break;
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}
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for(;;) {
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key.q = new BigInteger(qs,1,rng);
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if(key.q.subtract(BigInteger.ONE).gcd(key.ee).compareTo(BigInteger.ONE) == 0 && key.q.isProbablePrime(10)) break;
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}
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if(key.p.compareTo(key.q) <= 0) {
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var t = key.p;
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key.p = key.q;
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key.q = t;
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}
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var p1 = key.p.subtract(BigInteger.ONE);
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var q1 = key.q.subtract(BigInteger.ONE);
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var phi = p1.multiply(q1);
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if(phi.gcd(key.ee).compareTo(BigInteger.ONE) == 0) {
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key.n = key.p.multiply(key.q);
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key.d = key.ee.modInverse(phi);
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key.dmp1 = key.d.mod(p1);
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key.dmq1 = key.d.mod(q1);
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key.u = key.p.modInverse(key.q);
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break;
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}
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}
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return key;
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}
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this.encrypt = encrypt;
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this.decrypt = decrypt;
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this.verify = verify;
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this.sign = sign;
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this.generate = generate;
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this.keyObject = keyObject;
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}
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</code></pre>
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</article>
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</section>
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