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annotate src/ch/ethz/ssh2/crypto/cipher/DESede.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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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 }