+++ /dev/null
-/* SHA1PRNG.java --- Secure Random SPI SHA1PRNG
- Copyright (C) 1999, 2001 Free Software Foundation, Inc.
-
-This file is 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, 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; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 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.java.security.provider;
-
-import java.util.Random;
-import java.security.SecureRandomSpi;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.io.Serializable;
-
-public class SHA1PRNG extends SecureRandomSpi implements Serializable
-{
- MessageDigest digest;
- byte seed[];
- byte data[];
- int seedpos;
- int datapos;
-
- public SHA1PRNG()
- {
- try {
- digest = MessageDigest.getInstance("SHA");
- } catch ( NoSuchAlgorithmException nsae) {
- System.out.println("Failed to find SHA Message Digest: " + nsae);
- nsae.printStackTrace();
- }
-
- seed = new byte[20];
- seedpos = 0;
- data = new byte[40];
- datapos = 0;
-
- new Random().nextBytes(seed);
-
- byte digestdata[];
- digestdata = digest.digest( data );
- System.arraycopy( digestdata, 0, data, 0, 20);
-
- }
-
- public void engineSetSeed(byte[] seed)
- {
- for(int i = 0; i < seed.length; i++)
- this.seed[seedpos++ % 20] ^= seed[i];
- seedpos %= 20;
-
- }
-
- public void engineNextBytes(byte[] bytes)
- {
- int loc = 0;
- while (loc < bytes.length)
- {
- int copy = Math.min (bytes.length - loc, 20 - datapos);
-
- if (copy > 0)
- {
- System.arraycopy (data, datapos, bytes, loc, copy);
- datapos += copy;
- loc += copy;
- }
- else
- {
- // No data ready for copying, so refill our buffer.
- System.arraycopy( seed, 0, data, 20, 20);
- byte[] digestdata = digest.digest( data );
- System.arraycopy( digestdata, 0, data, 0, 20);
- datapos = 0;
- }
- }
- }
-
- public byte[] engineGenerateSeed(int numBytes)
- {
- byte tmp[] = new byte[numBytes];
-
- engineNextBytes( tmp );
- return tmp;
- }
-}