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1 package ch.ethz.ssh2.crypto.cipher;
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2
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3 /*
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4 This file was shamelessly taken (and modified) from the Bouncy Castle Crypto package.
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5 Their licence file states the following:
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6
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7 Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle
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8 (http://www.bouncycastle.org)
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9
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10 Permission is hereby granted, free of charge, to any person obtaining a copy
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11 of this software and associated documentation files (the "Software"), to deal
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12 in the Software without restriction, including without limitation the rights
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13 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 copies of the Software, and to permit persons to whom the Software is
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15 furnished to do so, subject to the following conditions:
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16
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17 The above copyright notice and this permission notice shall be included in
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18 all copies or substantial portions of the Software.
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19
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20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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21 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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22 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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23 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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24 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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25 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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26 THE SOFTWARE.
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27 */
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28
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29 /**
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30 * DESede.
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31 *
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32 * @author See comments in the source file
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33 * @version 2.50, 03/15/10
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34 *
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35 */
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36 public class DESede extends DES {
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37 private int[] key1 = null;
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38 private int[] key2 = null;
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39 private int[] key3 = null;
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40
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41 private boolean encrypt;
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42
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43 /**
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44 * standard constructor.
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45 */
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46 public DESede() {
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47 }
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48
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49 /**
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50 * initialise a DES cipher.
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51 *
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52 * @param encrypting
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53 * whether or not we are for encryption.
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54 * @param key
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55 * the parameters required to set up the cipher.
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56 * @exception IllegalArgumentException
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57 * if the params argument is inappropriate.
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58 */
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59 @Override
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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 @Override
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68 public String getAlgorithmName() {
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69 return "DESede";
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70 }
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71
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72 @Override
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73 public int getBlockSize() {
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74 return 8;
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75 }
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76
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77 @Override
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78 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) {
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79 if (key1 == null) {
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80 throw new IllegalStateException("DESede engine not initialised!");
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81 }
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82
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83 if (encrypt) {
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84 desFunc(key1, in, inOff, out, outOff);
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85 desFunc(key2, out, outOff, out, outOff);
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86 desFunc(key3, out, outOff, out, outOff);
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87 }
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88 else {
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89 desFunc(key3, in, inOff, out, outOff);
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90 desFunc(key2, out, outOff, out, outOff);
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91 desFunc(key1, out, outOff, out, outOff);
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92 }
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93 }
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94
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95 @Override
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96 public void reset() {
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97 }
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98 }
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