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1
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2 package com.trilead.ssh2.crypto.cipher;
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3
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4 /*
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5 This file was shamelessly taken (and modified) from the Bouncy Castle Crypto package.
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6 Their licence file states the following:
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7
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8 Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle
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9 (http://www.bouncycastle.org)
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10
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11 Permission is hereby granted, free of charge, to any person obtaining a copy
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12 of this software and associated documentation files (the "Software"), to deal
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13 in the Software without restriction, including without limitation the rights
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14 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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15 copies of the Software, and to permit persons to whom the Software is
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16 furnished to do so, subject to the following conditions:
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17
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18 The above copyright notice and this permission notice shall be included in
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19 all copies or substantial portions of the Software.
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20
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21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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22 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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23 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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24 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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25 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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26 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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27 THE SOFTWARE.
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28 */
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29
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30 /**
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31 * DESede.
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32 *
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33 * @author See comments in the source file
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34 * @version $Id: DESede.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
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35 *
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36 */
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37 public class DESede extends DES {
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38 private int[] key1 = null;
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39 private int[] key2 = null;
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40 private int[] key3 = null;
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41
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42 private boolean encrypt;
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43
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44 /**
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45 * standard constructor.
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46 */
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47 public DESede() {
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48 }
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49
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50 /**
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51 * initialise a DES cipher.
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52 *
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53 * @param encrypting
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54 * whether or not we are for encryption.
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55 * @param key
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56 * the parameters required to set up the cipher.
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57 * @exception IllegalArgumentException
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58 * if the params argument is inappropriate.
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59 */
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60 public void init(boolean encrypting, byte[] key) {
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61 key1 = generateWorkingKey(encrypting, key, 0);
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62 key2 = generateWorkingKey(!encrypting, key, 8);
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63 key3 = generateWorkingKey(encrypting, key, 16);
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64 encrypt = encrypting;
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65 }
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66
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67 public String getAlgorithmName() {
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68 return "DESede";
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69 }
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70
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71 public int getBlockSize() {
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72 return 8;
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73 }
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74
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75 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) {
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76 if (key1 == null) {
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77 throw new IllegalStateException("DESede engine not initialised!");
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78 }
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79
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80 if (encrypt) {
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81 desFunc(key1, in, inOff, out, outOff);
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82 desFunc(key2, out, outOff, out, outOff);
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83 desFunc(key3, out, outOff, out, outOff);
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84 }
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85 else {
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86 desFunc(key3, in, inOff, out, outOff);
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87 desFunc(key2, out, outOff, out, outOff);
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88 desFunc(key1, out, outOff, out, outOff);
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89 }
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90 }
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91
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92 public void reset() {
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93 }
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94 }
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