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1
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2 package com.trilead.ssh2.crypto.cipher;
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3
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4 /*
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5 This file is based on the 3DES implementation from the Bouncy Castle Crypto package.
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6 Their licence file states the following:
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7
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8 Copyright (c) 2000 - 2004 The Legion Of The Bouncy Castle
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9 (http://www.bouncycastle.org)
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10
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11 Permission is hereby granted, free of charge, to any person obtaining a copy
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12 of this software and associated documentation files (the "Software"), to deal
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13 in the Software without restriction, including without limitation the rights
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14 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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15 copies of the Software, and to permit persons to whom the Software is
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16 furnished to do so, subject to the following conditions:
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17
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18 The above copyright notice and this permission notice shall be included in
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19 all copies or substantial portions of the Software.
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20
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21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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22 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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23 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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24 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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25 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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26 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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27 THE SOFTWARE.
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28 */
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29
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30 /**
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31 * DES.
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32 *
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33 * @author See comments in the source file
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34 * @version $Id: DES.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
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35 *
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36 */
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37 public class DES implements BlockCipher {
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38 private int[] workingKey = null;
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39
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40 /**
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41 * standard constructor.
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42 */
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43 public DES() {
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44 }
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45
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46 /**
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47 * initialise a DES cipher.
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48 *
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49 * @param encrypting
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50 * whether or not we are for encryption.
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51 * @param key
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52 * the parameters required to set up the cipher.
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53 * @exception IllegalArgumentException
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54 * if the params argument is inappropriate.
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55 */
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56 public void init(boolean encrypting, byte[] key) {
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57 this.workingKey = generateWorkingKey(encrypting, key, 0);
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58 }
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59
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60 public String getAlgorithmName() {
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61 return "DES";
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62 }
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63
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64 public int getBlockSize() {
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65 return 8;
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66 }
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67
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68 public void transformBlock(byte[] in, int inOff, byte[] out, int outOff) {
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69 if (workingKey == null) {
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70 throw new IllegalStateException("DES engine not initialised!");
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71 }
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72
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73 desFunc(workingKey, in, inOff, out, outOff);
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74 }
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75
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76 public void reset() {
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77 }
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78
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79 /**
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80 * what follows is mainly taken from "Applied Cryptography", by Bruce
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81 * Schneier, however it also bears great resemblance to Richard
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82 * Outerbridge's D3DES...
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83 */
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84
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85 static short[] Df_Key = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32,
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86 0x10, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67
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87 };
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88
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89 static short[] bytebit = { 0200, 0100, 040, 020, 010, 04, 02, 01 };
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90
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91 static int[] bigbyte = { 0x800000, 0x400000, 0x200000, 0x100000, 0x80000, 0x40000, 0x20000, 0x10000, 0x8000,
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92 0x4000, 0x2000, 0x1000, 0x800, 0x400, 0x200, 0x100, 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1
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93 };
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94
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95 /*
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96 * Use the key schedule specified in the Standard (ANSI X3.92-1981).
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97 */
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98
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99 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,
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100 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,
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101 4, 27, 19, 11, 3
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102 };
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103
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104 static byte[] totrot = { 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 };
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105
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106 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,
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107 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
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108 };
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109
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110 static int[] SP1 = { 0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, 0x00000004,
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111 0x00010000, 0x00000400, 0x01010400, 0x01010404, 0x00000400, 0x01000404, 0x01010004, 0x01000000, 0x00000004,
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112 0x00000404, 0x01000400, 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404, 0x00010004,
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113 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, 0x00010404, 0x01000000, 0x00010000, 0x01010404,
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114 0x00000004, 0x01010000, 0x01010400, 0x01000000, 0x01000000, 0x00000400, 0x01010004, 0x00010000, 0x00010400,
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115 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404, 0x01010404, 0x00010004, 0x01010000, 0x01000404,
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116 0x01000004, 0x00000404, 0x00010404, 0x01010400, 0x00000404, 0x01000400, 0x01000400, 0x00000000, 0x00010004,
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117 0x00010400, 0x00000000, 0x01010004
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118 };
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119
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120 static int[] SP2 = { 0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, 0x80100020,
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121 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000, 0x00100000, 0x00000020, 0x80100020,
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122 0x00108000, 0x00100020, 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000, 0x00100020,
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123 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, 0x80100000, 0x00008020, 0x00000000, 0x00108020,
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124 0x80100020, 0x00100000, 0x80008020, 0x80100000, 0x80108000, 0x00008000, 0x80100000, 0x80008000, 0x00000020,
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125 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000, 0x00008020, 0x80108000, 0x00100000, 0x80000020,
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126 0x00100020, 0x80008020, 0x80000020, 0x00100020, 0x00108000, 0x00000000, 0x80008000, 0x00008020, 0x80000000,
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127 0x80100020, 0x80108020, 0x00108000
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128 };
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129
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130 static int[] SP3 = { 0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, 0x00020208,
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131 0x08000200, 0x00020008, 0x08000008, 0x08000008, 0x00020000, 0x08020208, 0x00020008, 0x08020000, 0x00000208,
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132 0x08000000, 0x00000008, 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208, 0x08000208,
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133 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, 0x00000200, 0x08000000, 0x08020200, 0x08000000,
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134 0x00020008, 0x00000208, 0x00020000, 0x08020200, 0x08000200, 0x00000000, 0x00000200, 0x00020008, 0x08020208,
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135 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008, 0x08000208, 0x00020000, 0x08000000, 0x08020208,
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136 0x00000008, 0x00020208, 0x00020200, 0x08000008, 0x08020000, 0x08000208, 0x00000208, 0x08020000, 0x00020208,
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137 0x00000008, 0x08020008, 0x00020200
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138 };
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139
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140 static int[] SP4 = { 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, 0x00800001,
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141 0x00002001, 0x00000000, 0x00802000, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00800080, 0x00800001,
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142 0x00000001, 0x00002000, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080, 0x00800081,
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143 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, 0x00802081, 0x00000081, 0x00800080, 0x00800001,
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144 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00000000, 0x00802000, 0x00002080, 0x00800080, 0x00800081,
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145 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802081, 0x00000081, 0x00000001, 0x00002000,
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146 0x00800001, 0x00002001, 0x00802080, 0x00800081, 0x00002001, 0x00002080, 0x00800000, 0x00802001, 0x00000080,
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147 0x00800000, 0x00002000, 0x00802080
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148 };
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149
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150 static int[] SP5 = { 0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, 0x40000000,
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151 0x02080000, 0x40080100, 0x00080000, 0x02000100, 0x40080100, 0x42000100, 0x42080000, 0x00080100, 0x40000000,
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152 0x02000000, 0x40080000, 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100, 0x42080000,
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153 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, 0x42000000, 0x00080100, 0x00080000, 0x42000100,
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154 0x00000100, 0x02000000, 0x40000000, 0x02080000, 0x42000100, 0x40080100, 0x02000100, 0x40000000, 0x42080000,
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155 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000, 0x42080100, 0x00080100, 0x42000000, 0x42080100,
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156 0x02080000, 0x00000000, 0x40080000, 0x42000000, 0x00080100, 0x02000100, 0x40000100, 0x00080000, 0x00000000,
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157 0x40080000, 0x02080100, 0x40000100
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158 };
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159
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160 static int[] SP6 = { 0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, 0x20404010,
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161 0x00400000, 0x20004000, 0x00404010, 0x00400000, 0x20000010, 0x00400010, 0x20004000, 0x20000000, 0x00004010,
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162 0x00000000, 0x00400010, 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010, 0x20400010,
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163 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, 0x20404000, 0x20000000, 0x20004000, 0x00000010,
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164 0x20400010, 0x00404000, 0x20404010, 0x00400000, 0x00004010, 0x20000010, 0x00400000, 0x20004000, 0x20000000,
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165 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000, 0x00404010, 0x20404000, 0x00000000, 0x20400010,
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166 0x00000010, 0x00004000, 0x20400000, 0x00404010, 0x00004000, 0x00400010, 0x20004010, 0x00000000, 0x20404000,
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167 0x20000000, 0x00400010, 0x20004010
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168 };
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169
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170 static int[] SP7 = { 0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, 0x00200802,
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171 0x04200800, 0x04200802, 0x00200000, 0x00000000, 0x04000002, 0x00000002, 0x04000000, 0x04200002, 0x00000802,
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172 0x04000800, 0x00200802, 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002, 0x04200000,
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173 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, 0x04000000, 0x00200800, 0x04000000, 0x00200800,
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174 0x00200000, 0x04000802, 0x04000802, 0x04200002, 0x04200002, 0x00000002, 0x00200002, 0x04000000, 0x04000800,
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175 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800, 0x00000802, 0x04000002, 0x04200802, 0x04200000,
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176 0x00200800, 0x00000000, 0x00000002, 0x04200802, 0x00000000, 0x00200802, 0x04200000, 0x00000800, 0x04000002,
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177 0x04000800, 0x00000800, 0x00200002
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178 };
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179
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180 static int[] SP8 = { 0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, 0x00000040,
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181 0x10000000, 0x00040040, 0x10040000, 0x10041040, 0x00041000, 0x10041000, 0x00041040, 0x00001000, 0x00000040,
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182 0x10040000, 0x10000040, 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000, 0x00001040,
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183 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, 0x00041040, 0x00040000, 0x00041040, 0x00040000,
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184 0x10041000, 0x00001000, 0x00000040, 0x10040040, 0x00001000, 0x00041040, 0x10001000, 0x00000040, 0x10000040,
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185 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040, 0x00000000, 0x10041040, 0x00040040, 0x10000040,
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186 0x10040000, 0x10001000, 0x10001040, 0x00000000, 0x10041040, 0x00041000, 0x00041000, 0x00001040, 0x00001040,
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187 0x00040040, 0x10000000, 0x10041000
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188 };
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189
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190 /**
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191 * generate an integer based working key based on our secret key and what we
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192 * processing we are planning to do.
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193 *
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194 * Acknowledgements for this routine go to James Gillogly & Phil Karn.
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195 * (whoever, and wherever they are!).
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196 */
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197 protected int[] generateWorkingKey(boolean encrypting, byte[] key, int off) {
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198 int[] newKey = new int[32];
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199 boolean[] pc1m = new boolean[56], pcr = new boolean[56];
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200
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201 for (int j = 0; j < 56; j++) {
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202 int l = pc1[j];
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203 pc1m[j] = ((key[off + (l >>> 3)] & bytebit[l & 07]) != 0);
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204 }
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205
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206 for (int i = 0; i < 16; i++) {
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207 int l, m, n;
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208
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209 if (encrypting) {
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210 m = i << 1;
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211 }
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212 else {
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213 m = (15 - i) << 1;
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214 }
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215
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216 n = m + 1;
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217 newKey[m] = newKey[n] = 0;
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218
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219 for (int j = 0; j < 28; j++) {
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220 l = j + totrot[i];
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221
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222 if (l < 28) {
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223 pcr[j] = pc1m[l];
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224 }
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225 else {
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226 pcr[j] = pc1m[l - 28];
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227 }
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228 }
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229
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230 for (int j = 28; j < 56; j++) {
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231 l = j + totrot[i];
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232
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233 if (l < 56) {
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234 pcr[j] = pc1m[l];
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235 }
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236 else {
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237 pcr[j] = pc1m[l - 28];
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238 }
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239 }
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240
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241 for (int j = 0; j < 24; j++) {
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242 if (pcr[pc2[j]]) {
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243 newKey[m] |= bigbyte[j];
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244 }
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245
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246 if (pcr[pc2[j + 24]]) {
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247 newKey[n] |= bigbyte[j];
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248 }
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249 }
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250 }
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251
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252 //
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253 // store the processed key
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254 //
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255 for (int i = 0; i != 32; i += 2) {
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256 int i1, i2;
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257 i1 = newKey[i];
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258 i2 = newKey[i + 1];
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259 newKey[i] = ((i1 & 0x00fc0000) << 6) | ((i1 & 0x00000fc0) << 10) | ((i2 & 0x00fc0000) >>> 10)
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260 | ((i2 & 0x00000fc0) >>> 6);
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261 newKey[i + 1] = ((i1 & 0x0003f000) << 12) | ((i1 & 0x0000003f) << 16) | ((i2 & 0x0003f000) >>> 4)
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262 | (i2 & 0x0000003f);
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263 }
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264
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265 return newKey;
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266 }
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267
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268 /**
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269 * the DES engine.
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270 */
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271 protected void desFunc(int[] wKey, byte[] in, int inOff, byte[] out, int outOff) {
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272 int work, right, left;
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273 left = (in[inOff + 0] & 0xff) << 24;
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274 left |= (in[inOff + 1] & 0xff) << 16;
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275 left |= (in[inOff + 2] & 0xff) << 8;
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276 left |= (in[inOff + 3] & 0xff);
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277 right = (in[inOff + 4] & 0xff) << 24;
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278 right |= (in[inOff + 5] & 0xff) << 16;
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279 right |= (in[inOff + 6] & 0xff) << 8;
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280 right |= (in[inOff + 7] & 0xff);
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281 work = ((left >>> 4) ^ right) & 0x0f0f0f0f;
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282 right ^= work;
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283 left ^= (work << 4);
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284 work = ((left >>> 16) ^ right) & 0x0000ffff;
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285 right ^= work;
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286 left ^= (work << 16);
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287 work = ((right >>> 2) ^ left) & 0x33333333;
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288 left ^= work;
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289 right ^= (work << 2);
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290 work = ((right >>> 8) ^ left) & 0x00ff00ff;
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291 left ^= work;
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292 right ^= (work << 8);
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293 right = ((right << 1) | ((right >>> 31) & 1)) & 0xffffffff;
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294 work = (left ^ right) & 0xaaaaaaaa;
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295 left ^= work;
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296 right ^= work;
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297 left = ((left << 1) | ((left >>> 31) & 1)) & 0xffffffff;
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298
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299 for (int round = 0; round < 8; round++) {
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300 int fval;
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301 work = (right << 28) | (right >>> 4);
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302 work ^= wKey[round * 4 + 0];
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303 fval = SP7[work & 0x3f];
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304 fval |= SP5[(work >>> 8) & 0x3f];
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305 fval |= SP3[(work >>> 16) & 0x3f];
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306 fval |= SP1[(work >>> 24) & 0x3f];
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307 work = right ^ wKey[round * 4 + 1];
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308 fval |= SP8[work & 0x3f];
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309 fval |= SP6[(work >>> 8) & 0x3f];
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310 fval |= SP4[(work >>> 16) & 0x3f];
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311 fval |= SP2[(work >>> 24) & 0x3f];
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312 left ^= fval;
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313 work = (left << 28) | (left >>> 4);
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314 work ^= wKey[round * 4 + 2];
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315 fval = SP7[work & 0x3f];
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316 fval |= SP5[(work >>> 8) & 0x3f];
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317 fval |= SP3[(work >>> 16) & 0x3f];
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318 fval |= SP1[(work >>> 24) & 0x3f];
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319 work = left ^ wKey[round * 4 + 3];
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320 fval |= SP8[work & 0x3f];
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321 fval |= SP6[(work >>> 8) & 0x3f];
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322 fval |= SP4[(work >>> 16) & 0x3f];
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323 fval |= SP2[(work >>> 24) & 0x3f];
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|
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324 right ^= fval;
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|
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325 }
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326
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327 right = (right << 31) | (right >>> 1);
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328 work = (left ^ right) & 0xaaaaaaaa;
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|
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329 left ^= work;
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330 right ^= work;
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331 left = (left << 31) | (left >>> 1);
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332 work = ((left >>> 8) ^ right) & 0x00ff00ff;
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|
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333 right ^= work;
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|
334 left ^= (work << 8);
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335 work = ((left >>> 2) ^ right) & 0x33333333;
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|
|
336 right ^= work;
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|
|
337 left ^= (work << 2);
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|
338 work = ((right >>> 16) ^ left) & 0x0000ffff;
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|
|
339 left ^= work;
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|
|
340 right ^= (work << 16);
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|
|
341 work = ((right >>> 4) ^ left) & 0x0f0f0f0f;
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|
|
342 left ^= work;
|
|
|
343 right ^= (work << 4);
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|
|
344 out[outOff + 0] = (byte)((right >>> 24) & 0xff);
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|
|
345 out[outOff + 1] = (byte)((right >>> 16) & 0xff);
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|
|
346 out[outOff + 2] = (byte)((right >>> 8) & 0xff);
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|
|
347 out[outOff + 3] = (byte)(right & 0xff);
|
|
|
348 out[outOff + 4] = (byte)((left >>> 24) & 0xff);
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|
|
349 out[outOff + 5] = (byte)((left >>> 16) & 0xff);
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|
|
350 out[outOff + 6] = (byte)((left >>> 8) & 0xff);
|
|
|
351 out[outOff + 7] = (byte)(left & 0xff);
|
|
|
352 }
|
|
|
353 }
|
