Mercurial > 510Connectbot
annotate src/ch/ethz/ssh2/crypto/cipher/DES.java @ 416:07c1da90deab
avoid null pointer
| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Mon, 27 Oct 2014 13:58:42 -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 is based on the 3DES implementation 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 * DES. |
| 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 DES implements BlockCipher { |
| 37 private int[] workingKey = null; | |
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38 |
| 307 | 39 /** |
| 40 * standard constructor. | |
| 41 */ | |
| 42 public DES() { | |
| 43 } | |
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44 |
| 307 | 45 /** |
| 46 * initialise a DES cipher. | |
| 47 * | |
| 48 * @param encrypting | |
| 49 * whether or not we are for encryption. | |
| 50 * @param key | |
| 51 * the parameters required to set up the cipher. | |
| 52 * @exception IllegalArgumentException | |
| 53 * if the params argument is inappropriate. | |
| 54 */ | |
| 55 public void init(boolean encrypting, byte[] key) { | |
| 56 this.workingKey = generateWorkingKey(encrypting, key, 0); | |
| 57 } | |
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58 |
| 307 | 59 public String getAlgorithmName() { |
| 60 return "DES"; | |
| 61 } | |
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62 |
| 307 | 63 public int getBlockSize() { |
| 64 return 8; | |
| 65 } | |
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66 |
| 307 | 67 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) { |
| 68 if (workingKey == null) { | |
| 69 throw new IllegalStateException("DES engine not initialised!"); | |
| 70 } | |
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71 |
| 307 | 72 desFunc(workingKey, in, inOff, out, outOff); |
| 73 } | |
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74 |
| 307 | 75 public void reset() { |
| 76 } | |
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77 |
| 307 | 78 /** |
| 79 * what follows is mainly taken from "Applied Cryptography", by Bruce | |
| 80 * Schneier, however it also bears great resemblance to Richard | |
| 81 * Outerbridge's D3DES... | |
| 82 */ | |
| 83 | |
| 84 static short[] Df_Key = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, | |
| 85 0x10, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67 | |
| 86 }; | |
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87 |
| 307 | 88 static short[] bytebit = { 0200, 0100, 040, 020, 010, 04, 02, 01 }; |
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89 |
| 307 | 90 static int[] bigbyte = { 0x800000, 0x400000, 0x200000, 0x100000, 0x80000, 0x40000, 0x20000, 0x10000, 0x8000, |
| 91 0x4000, 0x2000, 0x1000, 0x800, 0x400, 0x200, 0x100, 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1 | |
| 92 }; | |
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93 |
| 307 | 94 /* |
| 95 * Use the key schedule specified in the Standard (ANSI X3.92-1981). | |
| 96 */ | |
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97 |
| 307 | 98 static byte[] pc1 = { 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, |
| 99 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36, 28, 20, 12, | |
| 100 4, 27, 19, 11, 3 | |
| 101 }; | |
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102 |
| 307 | 103 static byte[] totrot = { 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 }; |
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104 |
| 307 | 105 static byte[] pc2 = { 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, 40, |
| 106 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 | |
| 107 }; | |
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108 |
| 307 | 109 static int[] SP1 = { 0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, 0x00000004, |
| 110 0x00010000, 0x00000400, 0x01010400, 0x01010404, 0x00000400, 0x01000404, 0x01010004, 0x01000000, 0x00000004, | |
| 111 0x00000404, 0x01000400, 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404, 0x00010004, | |
| 112 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, 0x00010404, 0x01000000, 0x00010000, 0x01010404, | |
| 113 0x00000004, 0x01010000, 0x01010400, 0x01000000, 0x01000000, 0x00000400, 0x01010004, 0x00010000, 0x00010400, | |
| 114 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404, 0x01010404, 0x00010004, 0x01010000, 0x01000404, | |
| 115 0x01000004, 0x00000404, 0x00010404, 0x01010400, 0x00000404, 0x01000400, 0x01000400, 0x00000000, 0x00010004, | |
| 116 0x00010400, 0x00000000, 0x01010004 | |
| 117 }; | |
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118 |
| 307 | 119 static int[] SP2 = { 0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, 0x80100020, |
| 120 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000, 0x00100000, 0x00000020, 0x80100020, | |
| 121 0x00108000, 0x00100020, 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000, 0x00100020, | |
| 122 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, 0x80100000, 0x00008020, 0x00000000, 0x00108020, | |
| 123 0x80100020, 0x00100000, 0x80008020, 0x80100000, 0x80108000, 0x00008000, 0x80100000, 0x80008000, 0x00000020, | |
| 124 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000, 0x00008020, 0x80108000, 0x00100000, 0x80000020, | |
| 125 0x00100020, 0x80008020, 0x80000020, 0x00100020, 0x00108000, 0x00000000, 0x80008000, 0x00008020, 0x80000000, | |
| 126 0x80100020, 0x80108020, 0x00108000 | |
| 127 }; | |
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128 |
| 307 | 129 static int[] SP3 = { 0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, 0x00020208, |
| 130 0x08000200, 0x00020008, 0x08000008, 0x08000008, 0x00020000, 0x08020208, 0x00020008, 0x08020000, 0x00000208, | |
| 131 0x08000000, 0x00000008, 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208, 0x08000208, | |
| 132 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, 0x00000200, 0x08000000, 0x08020200, 0x08000000, | |
| 133 0x00020008, 0x00000208, 0x00020000, 0x08020200, 0x08000200, 0x00000000, 0x00000200, 0x00020008, 0x08020208, | |
| 134 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008, 0x08000208, 0x00020000, 0x08000000, 0x08020208, | |
| 135 0x00000008, 0x00020208, 0x00020200, 0x08000008, 0x08020000, 0x08000208, 0x00000208, 0x08020000, 0x00020208, | |
| 136 0x00000008, 0x08020008, 0x00020200 | |
| 137 }; | |
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138 |
| 307 | 139 static int[] SP4 = { 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, 0x00800001, |
| 140 0x00002001, 0x00000000, 0x00802000, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00800080, 0x00800001, | |
| 141 0x00000001, 0x00002000, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080, 0x00800081, | |
| 142 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, 0x00802081, 0x00000081, 0x00800080, 0x00800001, | |
| 143 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00000000, 0x00802000, 0x00002080, 0x00800080, 0x00800081, | |
| 144 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802081, 0x00000081, 0x00000001, 0x00002000, | |
| 145 0x00800001, 0x00002001, 0x00802080, 0x00800081, 0x00002001, 0x00002080, 0x00800000, 0x00802001, 0x00000080, | |
| 146 0x00800000, 0x00002000, 0x00802080 | |
| 147 }; | |
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148 |
| 307 | 149 static int[] SP5 = { 0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, 0x40000000, |
| 150 0x02080000, 0x40080100, 0x00080000, 0x02000100, 0x40080100, 0x42000100, 0x42080000, 0x00080100, 0x40000000, | |
| 151 0x02000000, 0x40080000, 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100, 0x42080000, | |
| 152 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, 0x42000000, 0x00080100, 0x00080000, 0x42000100, | |
| 153 0x00000100, 0x02000000, 0x40000000, 0x02080000, 0x42000100, 0x40080100, 0x02000100, 0x40000000, 0x42080000, | |
| 154 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000, 0x42080100, 0x00080100, 0x42000000, 0x42080100, | |
| 155 0x02080000, 0x00000000, 0x40080000, 0x42000000, 0x00080100, 0x02000100, 0x40000100, 0x00080000, 0x00000000, | |
| 156 0x40080000, 0x02080100, 0x40000100 | |
| 157 }; | |
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158 |
| 307 | 159 static int[] SP6 = { 0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, 0x20404010, |
| 160 0x00400000, 0x20004000, 0x00404010, 0x00400000, 0x20000010, 0x00400010, 0x20004000, 0x20000000, 0x00004010, | |
| 161 0x00000000, 0x00400010, 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010, 0x20400010, | |
| 162 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, 0x20404000, 0x20000000, 0x20004000, 0x00000010, | |
| 163 0x20400010, 0x00404000, 0x20404010, 0x00400000, 0x00004010, 0x20000010, 0x00400000, 0x20004000, 0x20000000, | |
| 164 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000, 0x00404010, 0x20404000, 0x00000000, 0x20400010, | |
| 165 0x00000010, 0x00004000, 0x20400000, 0x00404010, 0x00004000, 0x00400010, 0x20004010, 0x00000000, 0x20404000, | |
| 166 0x20000000, 0x00400010, 0x20004010 | |
| 167 }; | |
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168 |
| 307 | 169 static int[] SP7 = { 0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, 0x00200802, |
| 170 0x04200800, 0x04200802, 0x00200000, 0x00000000, 0x04000002, 0x00000002, 0x04000000, 0x04200002, 0x00000802, | |
| 171 0x04000800, 0x00200802, 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002, 0x04200000, | |
| 172 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, 0x04000000, 0x00200800, 0x04000000, 0x00200800, | |
| 173 0x00200000, 0x04000802, 0x04000802, 0x04200002, 0x04200002, 0x00000002, 0x00200002, 0x04000000, 0x04000800, | |
| 174 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800, 0x00000802, 0x04000002, 0x04200802, 0x04200000, | |
| 175 0x00200800, 0x00000000, 0x00000002, 0x04200802, 0x00000000, 0x00200802, 0x04200000, 0x00000800, 0x04000002, | |
| 176 0x04000800, 0x00000800, 0x00200002 | |
| 177 }; | |
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178 |
| 307 | 179 static int[] SP8 = { 0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, 0x00000040, |
| 180 0x10000000, 0x00040040, 0x10040000, 0x10041040, 0x00041000, 0x10041000, 0x00041040, 0x00001000, 0x00000040, | |
| 181 0x10040000, 0x10000040, 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000, 0x00001040, | |
| 182 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, 0x00041040, 0x00040000, 0x00041040, 0x00040000, | |
| 183 0x10041000, 0x00001000, 0x00000040, 0x10040040, 0x00001000, 0x00041040, 0x10001000, 0x00000040, 0x10000040, | |
| 184 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040, 0x00000000, 0x10041040, 0x00040040, 0x10000040, | |
| 185 0x10040000, 0x10001000, 0x10001040, 0x00000000, 0x10041040, 0x00041000, 0x00041000, 0x00001040, 0x00001040, | |
| 186 0x00040040, 0x10000000, 0x10041000 | |
| 187 }; | |
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188 |
| 307 | 189 /** |
| 190 * generate an integer based working key based on our secret key and what we | |
| 191 * processing we are planning to do. | |
| 192 * | |
| 193 * Acknowledgements for this routine go to James Gillogly & Phil Karn. | |
| 194 * (whoever, and wherever they are!). | |
| 195 */ | |
| 196 protected int[] generateWorkingKey(boolean encrypting, byte[] key, int off) { | |
| 197 int[] newKey = new int[32]; | |
| 198 boolean[] pc1m = new boolean[56], pcr = new boolean[56]; | |
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199 |
| 307 | 200 for (int j = 0; j < 56; j++) { |
| 201 int l = pc1[j]; | |
| 202 pc1m[j] = ((key[off + (l >>> 3)] & bytebit[l & 07]) != 0); | |
| 203 } | |
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204 |
| 307 | 205 for (int i = 0; i < 16; i++) { |
| 206 int l, m, n; | |
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207 |
| 307 | 208 if (encrypting) { |
| 209 m = i << 1; | |
| 210 } | |
| 211 else { | |
| 212 m = (15 - i) << 1; | |
| 213 } | |
| 214 | |
| 215 n = m + 1; | |
| 216 newKey[m] = newKey[n] = 0; | |
| 217 | |
| 218 for (int j = 0; j < 28; j++) { | |
| 219 l = j + totrot[i]; | |
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220 |
| 307 | 221 if (l < 28) { |
| 222 pcr[j] = pc1m[l]; | |
| 223 } | |
| 224 else { | |
| 225 pcr[j] = pc1m[l - 28]; | |
| 226 } | |
| 227 } | |
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228 |
| 307 | 229 for (int j = 28; j < 56; j++) { |
| 230 l = j + totrot[i]; | |
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231 |
| 307 | 232 if (l < 56) { |
| 233 pcr[j] = pc1m[l]; | |
| 234 } | |
| 235 else { | |
| 236 pcr[j] = pc1m[l - 28]; | |
| 237 } | |
| 238 } | |
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239 |
| 307 | 240 for (int j = 0; j < 24; j++) { |
| 241 if (pcr[pc2[j]]) { | |
| 242 newKey[m] |= bigbyte[j]; | |
| 243 } | |
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244 |
| 307 | 245 if (pcr[pc2[j + 24]]) { |
| 246 newKey[n] |= bigbyte[j]; | |
| 247 } | |
| 248 } | |
| 249 } | |
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250 |
| 307 | 251 // |
| 252 // store the processed key | |
| 253 // | |
| 254 for (int i = 0; i != 32; i += 2) { | |
| 255 int i1, i2; | |
| 256 i1 = newKey[i]; | |
| 257 i2 = newKey[i + 1]; | |
| 258 newKey[i] = ((i1 & 0x00fc0000) << 6) | ((i1 & 0x00000fc0) << 10) | ((i2 & 0x00fc0000) >>> 10) | |
| 259 | ((i2 & 0x00000fc0) >>> 6); | |
| 260 newKey[i + 1] = ((i1 & 0x0003f000) << 12) | ((i1 & 0x0000003f) << 16) | ((i2 & 0x0003f000) >>> 4) | |
| 261 | (i2 & 0x0000003f); | |
| 262 } | |
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263 |
| 307 | 264 return newKey; |
| 265 } | |
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266 |
| 307 | 267 /** |
| 268 * the DES engine. | |
| 269 */ | |
| 270 protected void desFunc(int[] wKey, byte[] in, int inOff, byte[] out, int outOff) { | |
| 271 int work, right, left; | |
| 272 left = (in[inOff + 0] & 0xff) << 24; | |
| 273 left |= (in[inOff + 1] & 0xff) << 16; | |
| 274 left |= (in[inOff + 2] & 0xff) << 8; | |
| 275 left |= (in[inOff + 3] & 0xff); | |
| 276 right = (in[inOff + 4] & 0xff) << 24; | |
| 277 right |= (in[inOff + 5] & 0xff) << 16; | |
| 278 right |= (in[inOff + 6] & 0xff) << 8; | |
| 279 right |= (in[inOff + 7] & 0xff); | |
| 280 work = ((left >>> 4) ^ right) & 0x0f0f0f0f; | |
| 281 right ^= work; | |
| 282 left ^= (work << 4); | |
| 283 work = ((left >>> 16) ^ right) & 0x0000ffff; | |
| 284 right ^= work; | |
| 285 left ^= (work << 16); | |
| 286 work = ((right >>> 2) ^ left) & 0x33333333; | |
| 287 left ^= work; | |
| 288 right ^= (work << 2); | |
| 289 work = ((right >>> 8) ^ left) & 0x00ff00ff; | |
| 290 left ^= work; | |
| 291 right ^= (work << 8); | |
| 292 right = ((right << 1) | ((right >>> 31) & 1)) & 0xffffffff; | |
| 293 work = (left ^ right) & 0xaaaaaaaa; | |
| 294 left ^= work; | |
| 295 right ^= work; | |
| 296 left = ((left << 1) | ((left >>> 31) & 1)) & 0xffffffff; | |
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297 |
| 307 | 298 for (int round = 0; round < 8; round++) { |
| 299 int fval; | |
| 300 work = (right << 28) | (right >>> 4); | |
| 301 work ^= wKey[round * 4 + 0]; | |
| 302 fval = SP7[work & 0x3f]; | |
| 303 fval |= SP5[(work >>> 8) & 0x3f]; | |
| 304 fval |= SP3[(work >>> 16) & 0x3f]; | |
| 305 fval |= SP1[(work >>> 24) & 0x3f]; | |
| 306 work = right ^ wKey[round * 4 + 1]; | |
| 307 fval |= SP8[work & 0x3f]; | |
| 308 fval |= SP6[(work >>> 8) & 0x3f]; | |
| 309 fval |= SP4[(work >>> 16) & 0x3f]; | |
| 310 fval |= SP2[(work >>> 24) & 0x3f]; | |
| 311 left ^= fval; | |
| 312 work = (left << 28) | (left >>> 4); | |
| 313 work ^= wKey[round * 4 + 2]; | |
| 314 fval = SP7[work & 0x3f]; | |
| 315 fval |= SP5[(work >>> 8) & 0x3f]; | |
| 316 fval |= SP3[(work >>> 16) & 0x3f]; | |
| 317 fval |= SP1[(work >>> 24) & 0x3f]; | |
| 318 work = left ^ wKey[round * 4 + 3]; | |
| 319 fval |= SP8[work & 0x3f]; | |
| 320 fval |= SP6[(work >>> 8) & 0x3f]; | |
| 321 fval |= SP4[(work >>> 16) & 0x3f]; | |
| 322 fval |= SP2[(work >>> 24) & 0x3f]; | |
| 323 right ^= fval; | |
| 324 } | |
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325 |
| 307 | 326 right = (right << 31) | (right >>> 1); |
| 327 work = (left ^ right) & 0xaaaaaaaa; | |
| 328 left ^= work; | |
| 329 right ^= work; | |
| 330 left = (left << 31) | (left >>> 1); | |
| 331 work = ((left >>> 8) ^ right) & 0x00ff00ff; | |
| 332 right ^= work; | |
| 333 left ^= (work << 8); | |
| 334 work = ((left >>> 2) ^ right) & 0x33333333; | |
| 335 right ^= work; | |
| 336 left ^= (work << 2); | |
| 337 work = ((right >>> 16) ^ left) & 0x0000ffff; | |
| 338 left ^= work; | |
| 339 right ^= (work << 16); | |
| 340 work = ((right >>> 4) ^ left) & 0x0f0f0f0f; | |
| 341 left ^= work; | |
| 342 right ^= (work << 4); | |
| 343 out[outOff + 0] = (byte)((right >>> 24) & 0xff); | |
| 344 out[outOff + 1] = (byte)((right >>> 16) & 0xff); | |
| 345 out[outOff + 2] = (byte)((right >>> 8) & 0xff); | |
| 346 out[outOff + 3] = (byte)(right & 0xff); | |
| 347 out[outOff + 4] = (byte)((left >>> 24) & 0xff); | |
| 348 out[outOff + 5] = (byte)((left >>> 16) & 0xff); | |
| 349 out[outOff + 6] = (byte)((left >>> 8) & 0xff); | |
| 350 out[outOff + 7] = (byte)(left & 0xff); | |
| 351 } | |
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352 } |