| /* KeyPool.java -- A set of ephemeral key pairs. |
| Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.net.ssl.provider; |
| |
| import java.math.BigInteger; |
| import java.security.KeyPair; |
| import java.security.SecureRandom; |
| |
| final class KeyPool |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------- |
| |
| private static final BigInteger ONE = BigInteger.ONE; |
| private static final BigInteger TWO = BigInteger.valueOf(2L); |
| private static final BigInteger E = BigInteger.valueOf(65537L); |
| private static final SecureRandom RANDOM = new SecureRandom (); |
| |
| // Constructor. |
| // ------------------------------------------------------------------------- |
| |
| private KeyPool() |
| { |
| } |
| |
| // Class methods. |
| // ------------------------------------------------------------------------- |
| |
| /** |
| * Generate an export-class (512 bit) RSA key pair. |
| * |
| * @return The new key pair. |
| */ |
| static KeyPair generateRSAKeyPair() |
| { |
| BigInteger p, q, n, d; |
| |
| // Simplified version of GNU Crypto's RSAKeyPairGenerator. |
| |
| int M = 256; |
| BigInteger lower = TWO.pow(255); |
| BigInteger upper = TWO.pow(256).subtract(ONE); |
| byte[] kb = new byte[32]; |
| while (true) |
| { |
| nextBytes(kb); |
| p = new BigInteger(1, kb).setBit(0); |
| if (p.compareTo(lower) >= 0 && p.compareTo(upper) <= 0 && |
| p.isProbablePrime(80) && p.gcd(E).equals(ONE)) |
| break; |
| } |
| |
| while (true) |
| { |
| nextBytes(kb); |
| q = new BigInteger(1, kb).setBit(0); |
| n = q.multiply(p); |
| if (n.bitLength() == 512 && q.isProbablePrime(80) && |
| q.gcd(E).equals(ONE)) |
| break; |
| } |
| |
| d = E.modInverse(p.subtract(ONE).multiply(q.subtract(ONE))); |
| |
| return new KeyPair(new JessieRSAPublicKey(n, E), |
| new JessieRSAPrivateKey(n, d)); |
| } |
| |
| private static void nextBytes(byte[] buf) |
| { |
| RANDOM.nextBytes (buf); |
| } |
| } |