DES3.java

/*
 * This file is part of "The Java Telnet Application".
 *
 * (c) Matthias L. Jugel, Marcus Mei�ner 1996-2002. All Rights Reserved.
 * The file was changed by Radek Polak to work as midlet in MIDP 1.0
 *
 * Please visit http://javatelnet.org/ for updates and contact.
 *
 * --LICENSE NOTICE--
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * --LICENSE NOTICE--
 *
 * Additional NOTICE: This file uses DES (see DES.java for copyright
 * information!)
 */
package ssh.v1;


public final class DES3 extends Cipher {
	private DES des1 = new DES();

    private DES des2 = new DES();

    private DES des3 = new DES();

	public void encrypt( byte[] src, int srcOff, byte[] dest, int destOff, int len ) {
		des1.encrypt( src, srcOff, dest, destOff, len );
		des2.decrypt( dest, destOff, dest, destOff, len );
		des3.encrypt( dest, destOff, dest, destOff, len );
	}

	public void decrypt( byte[] src, int srcOff, byte[] dest, int destOff, int len ) {
		des3.decrypt( src, srcOff, dest, destOff, len );
		des2.encrypt( dest, destOff, dest, destOff, len );
		des1.decrypt( dest, destOff, dest, destOff, len );
	}

	public void setKey( byte[] key ) {
		byte[] subKey = new byte[8];
		des1.setKey( key );
		System.arraycopy( key, 8, subKey, 0, 8 );
		des2.setKey( subKey );
		System.arraycopy( key, 16, subKey, 0, 8 );
		des3.setKey( subKey );
	}

	/*
	 * !!! DEBUG public static void main(String[] argv) { byte[] key = {
	 * (byte)0x12, (byte)0x34, (byte)0x56, (byte)0x78, (byte)0x87, (byte)0x65,
	 * (byte)0x43, (byte)0x21, (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
	 * (byte)0x87, (byte)0x65, (byte)0x43, (byte)0x21, (byte)0x87, (byte)0x65,
	 * (byte)0x43, (byte)0x21, (byte)0x12, (byte)0x34, (byte)0x56, (byte)0x78, };
	 * 
	 * byte[] txt = { (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
	 * (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77, (byte)0x00, (byte)0x11,
	 * (byte)0x22, (byte)0x33, (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
	 * (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33, (byte)0x44, (byte)0x55,
	 * (byte)0x66, (byte)0x77 };
	 * 
	 * byte[] enc; byte[] dec;
	 * 
	 * System.out.println("key: " + printHex(key)); System.out.println("txt: " +
	 * printHex(txt));
	 * 
	 * DES3 cipher = new DES3(); cipher.setKey(key);
	 * 
	 * enc = cipher.encrypt(txt); System.out.println("enc: " + printHex(enc));
	 * 
	 * cipher = new DES3(); cipher.setKey(key);
	 * 
	 * dec = cipher.decrypt(enc);
	 * 
	 * System.out.println("dec: " + printHex(dec)); }
	 * 
	 * static String printHex(byte[] buf) { byte[] out = new byte[buf.length +
	 * 1]; out[0] = 0; System.arraycopy(buf, 0, out, 1, buf.length); BigInteger
	 * big = new BigInteger(out); return big.toString(16); } static String
	 * printHex(int i) { BigInteger b = BigInteger.valueOf((long)i +
	 * 0x100000000L); BigInteger c = BigInteger.valueOf(0x100000000L);
	 * if(b.compareTo(c) != -1) b = b.subtract(c); return b.toString(16); }
	 *  
	 */

}