MD5State.java

package com.twmacinta.util;

/**
 * Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher<br>
 * Originally written by Santeri Paavolainen, Helsinki Finland 1996 <br>
 * (c) Santeri Paavolainen, Helsinki Finland 1996 <br>
 * Some changes Copyright (c) 2002 Timothy W Macinta <br>
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library 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
 * Library General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * <p>
 * See http://www.twmacinta.com/myjava/fast_md5.php for more information
 * on this file.
 * <p>
 * Contains internal state of the MD5 class
 * <p>
 * Please note: I (Timothy Macinta) have put this code in the
 * com.twmacinta.util package only because it came without a package.  I
 * was not the the original author of the code, although I did
 * optimize it (substantially) and fix some bugs.
 *
 * @author	Santeri Paavolainen <sjpaavol@cc.helsinki.fi>
 * @author	Timothy W Macinta (twm@alum.mit.edu) (optimizations and bug fixes)
 **/

class MD5State {
  /**
   * 128-bit state 
   */
  int	state[];
  
  /**
   * 64-bit character count
   */
  long count;
  
  /**
   * 64-byte buffer (512 bits) for storing to-be-hashed characters
   */
  byte	buffer[];

  public MD5State() {
    buffer = new byte[64];
    count = 0;
    state = new int[4];
    
    state[0] = 0x67452301;
    state[1] = 0xefcdab89;
    state[2] = 0x98badcfe;
    state[3] = 0x10325476;

  }

  /** Create this State as a copy of another state */
  public MD5State (MD5State from) {
    this();
    
    int i;
    
    for (i = 0; i < buffer.length; i++)
      this.buffer[i] = from.buffer[i];
    
    for (i = 0; i < state.length; i++)
      this.state[i] = from.state[i];
    
    this.count = from.count;
  }
};