Mercurial > 510Connectbot
annotate src/ch/ethz/ssh2/crypto/cipher/DESede.java @ 286:4656869af8fe ganymed
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author | Carl Byington <carl@five-ten-sg.com> |
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date | Fri, 18 Jul 2014 19:26:29 -0700 |
parents | 91a31873c42a |
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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 { |
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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 /** |
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52 * initialise a DES cipher. |
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53 * |
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54 * @param encrypting |
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55 * whether or not we are for encryption. |
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56 * @param key |
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57 * the parameters required to set up the cipher. |
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58 * @exception IllegalArgumentException |
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59 * if the params argument is inappropriate. |
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60 */ |
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61 @Override |
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62 public void init(boolean encrypting, byte[] key) |
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63 { |
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64 key1 = generateWorkingKey(encrypting, key, 0); |
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65 key2 = generateWorkingKey(!encrypting, key, 8); |
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66 key3 = generateWorkingKey(encrypting, key, 16); |
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67 |
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68 encrypt = encrypting; |
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69 } |
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70 |
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71 @Override |
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72 public String getAlgorithmName() |
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73 { |
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74 return "DESede"; |
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75 } |
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76 |
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77 @Override |
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78 public int getBlockSize() |
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79 { |
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80 return 8; |
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81 } |
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82 |
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83 @Override |
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84 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) |
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85 { |
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86 if (key1 == null) |
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87 { |
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88 throw new IllegalStateException("DESede engine not initialised!"); |
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89 } |
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90 |
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91 if (encrypt) |
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92 { |
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93 desFunc(key1, in, inOff, out, outOff); |
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94 desFunc(key2, out, outOff, out, outOff); |
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95 desFunc(key3, out, outOff, out, outOff); |
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96 } |
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97 else |
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98 { |
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99 desFunc(key3, in, inOff, out, outOff); |
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100 desFunc(key2, out, outOff, out, outOff); |
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101 desFunc(key1, out, outOff, out, outOff); |
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102 } |
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103 } |
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104 |
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105 @Override |
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106 public void reset() |
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107 { |
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108 } |
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109 } |