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annotate src/ch/ethz/ssh2/crypto/cipher/DESede.java @ 381:95188bd4badb
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Wed, 06 Aug 2014 10:38:50 -0700 |
| parents | 071eccdff8ea |
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| rev | line source |
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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 |
| 307 | 26 THE SOFTWARE. |
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27 */ |
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28 |
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29 /** |
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30 * DESede. |
| 307 | 31 * |
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32 * @author See comments in the source file |
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33 * @version 2.50, 03/15/10 |
| 307 | 34 * |
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35 */ |
| 307 | 36 public class DESede extends DES { |
| 37 private int[] key1 = null; | |
| 38 private int[] key2 = null; | |
| 39 private int[] key3 = null; | |
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40 |
| 307 | 41 private boolean encrypt; |
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42 |
| 307 | 43 /** |
| 44 * standard constructor. | |
| 45 */ | |
| 46 public DESede() { | |
| 47 } | |
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48 |
| 307 | 49 /** |
| 50 * initialise a DES cipher. | |
| 51 * | |
| 52 * @param encrypting | |
| 53 * whether or not we are for encryption. | |
| 54 * @param key | |
| 55 * the parameters required to set up the cipher. | |
| 56 * @exception IllegalArgumentException | |
| 57 * if the params argument is inappropriate. | |
| 58 */ | |
| 59 @Override | |
| 60 public void init(boolean encrypting, byte[] key) { | |
| 61 key1 = generateWorkingKey(encrypting, key, 0); | |
| 62 key2 = generateWorkingKey(!encrypting, key, 8); | |
| 63 key3 = generateWorkingKey(encrypting, key, 16); | |
| 64 encrypt = encrypting; | |
| 65 } | |
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66 |
| 307 | 67 @Override |
| 68 public String getAlgorithmName() { | |
| 69 return "DESede"; | |
| 70 } | |
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71 |
| 307 | 72 @Override |
| 73 public int getBlockSize() { | |
| 74 return 8; | |
| 75 } | |
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76 |
| 307 | 77 @Override |
| 78 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) { | |
| 79 if (key1 == null) { | |
| 80 throw new IllegalStateException("DESede engine not initialised!"); | |
| 81 } | |
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82 |
| 307 | 83 if (encrypt) { |
| 84 desFunc(key1, in, inOff, out, outOff); | |
| 85 desFunc(key2, out, outOff, out, outOff); | |
| 86 desFunc(key3, out, outOff, out, outOff); | |
| 87 } | |
| 88 else { | |
| 89 desFunc(key3, in, inOff, out, outOff); | |
| 90 desFunc(key2, out, outOff, out, outOff); | |
| 91 desFunc(key1, out, outOff, out, outOff); | |
| 92 } | |
| 93 } | |
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94 |
| 307 | 95 @Override |
| 96 public void reset() { | |
| 97 } | |
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98 } |