line source
+ −
+ − package com.trilead.ssh2.crypto.cipher;
+ −
+ − /*
+ − This file was shamelessly taken (and modified) from the Bouncy Castle Crypto package.
+ − Their licence file states the following:
+ −
+ − Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle
+ − (http://www.bouncycastle.org)
+ −
+ − Permission is hereby granted, free of charge, to any person obtaining a copy
+ − of this software and associated documentation files (the "Software"), to deal
+ − in the Software without restriction, including without limitation the rights
+ − to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ − copies of the Software, and to permit persons to whom the Software is
+ − furnished to do so, subject to the following conditions:
+ −
+ − The above copyright notice and this permission notice shall be included in
+ − all copies or substantial portions of the Software.
+ −
+ − THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ − IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ − FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ − AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ − LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ − OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ − THE SOFTWARE.
+ − */
+ −
+ − /**
+ − * DESede.
+ − *
+ − * @author See comments in the source file
+ − * @version $Id: DESede.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
+ − *
+ − */
+ − public class DESede extends DES {
+ − private int[] key1 = null;
+ − private int[] key2 = null;
+ − private int[] key3 = null;
+ −
+ − private boolean encrypt;
+ −
+ − /**
+ − * standard constructor.
+ − */
+ − public DESede() {
+ − }
+ −
+ − /**
+ − * initialise a DES cipher.
+ − *
+ − * @param encrypting
+ − * whether or not we are for encryption.
+ − * @param key
+ − * the parameters required to set up the cipher.
+ − * @exception IllegalArgumentException
+ − * if the params argument is inappropriate.
+ − */
+ − public void init(boolean encrypting, byte[] key) {
+ − key1 = generateWorkingKey(encrypting, key, 0);
+ − key2 = generateWorkingKey(!encrypting, key, 8);
+ − key3 = generateWorkingKey(encrypting, key, 16);
+ − encrypt = encrypting;
+ − }
+ −
+ − public String getAlgorithmName() {
+ − return "DESede";
+ − }
+ −
+ − public int getBlockSize() {
+ − return 8;
+ − }
+ −
+ − public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) {
+ − if (key1 == null) {
+ − throw new IllegalStateException("DESede engine not initialised!");
+ − }
+ −
+ − if (encrypt) {
+ − desFunc(key1, in, inOff, out, outOff);
+ − desFunc(key2, out, outOff, out, outOff);
+ − desFunc(key3, out, outOff, out, outOff);
+ − }
+ − else {
+ − desFunc(key3, in, inOff, out, outOff);
+ − desFunc(key2, out, outOff, out, outOff);
+ − desFunc(key1, out, outOff, out, outOff);
+ − }
+ − }
+ −
+ − public void reset() {
+ − }
+ − }