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/*
* This file is part of "JTA - Telnet/SSH for the JAVA(tm) platform".
*
* (c) Matthias L. Jugel, Marcus Meißner 1996-2005. All Rights Reserved.
*
* 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 de.mud.ssh;
public final class DES3 extends Cipher {
static {
System.err.println("3DES Cipher.");
}
DES des1 = new DES();
DES des2 = new DES();
DES des3 = new DES();
public synchronized 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 synchronized 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);
}
*/
}
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