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-/* 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);
- }
-}