1 | /*
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2 | * UFC-crypt: ultra fast crypt(3) implementation
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3 | *
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4 | * Copyright (C) 1991, Michael Glad, email: [email protected]
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Library General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Library General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Library General Public
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17 | * License along with this library; if not, write to the Free
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18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | * @(#)crypt_util.c 2.2 10/04/91
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21 | *
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22 | * Support routines
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23 | *
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24 | */
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25 |
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26 | #ifdef DEBUG
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27 | #include <stdio.h>
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28 | #endif
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29 |
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30 | /*
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31 | #include "patchlevel.h"
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32 | */
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33 |
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34 |
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35 | /*
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36 | #ifdef SYSV
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37 | */
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38 | #define bzero(addr, cnt) memset(addr, 0, cnt)
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39 | #define bcopy(from, to, len) memcpy(to, from, len)
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40 | /*
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41 | #endif
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42 | */
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43 |
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44 | /* Permutation done once on the 56 bit
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45 | key derived from the original 8 byte ASCII key.
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46 | */
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47 | static unsigned long pc1[56] =
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48 | { 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
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49 | 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
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50 | 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
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51 | 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
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52 | };
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53 |
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54 | /* How much to rotate each 28 bit half of the pc1 permutated
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55 | 56 bit key before using pc2 to give the i' key
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56 | */
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57 | static unsigned long totrot[16] =
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58 | { 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 };
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59 |
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60 | /* Permutation giving the key of the i' DES round */
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61 | static unsigned long pc2[48] =
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62 | { 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
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63 | 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
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64 | 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
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65 | 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
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66 | };
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67 |
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68 | /* Reference copy of the expansion table which selects
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69 | bits from the 32 bit intermediate result.
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70 | */
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71 | static unsigned long eref[48] =
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72 | { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
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73 | 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17,
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74 | 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,
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75 | 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1
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76 | };
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77 | static unsigned long disturbed_e[48];
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78 | static unsigned long e_inverse[64];
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79 |
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80 | /* Permutation done on the result of sbox lookups */
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81 | static unsigned long perm32[32] =
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82 | { 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
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83 | 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
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84 | };
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85 |
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86 | /* The sboxes */
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87 | static unsigned long sbox[8][4][16]=
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88 | { { { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 },
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89 | { 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8 },
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90 | { 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0 },
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91 | { 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 }
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92 | },
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93 |
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94 | { { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },
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95 | { 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5 },
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96 | { 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15 },
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97 | { 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }
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98 | },
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99 |
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100 | { { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },
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101 | { 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1 },
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102 | { 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7 },
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103 | { 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 }
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104 | },
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105 |
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106 | { { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },
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107 | { 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9 },
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108 | { 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4 },
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109 | { 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 }
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110 | },
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111 |
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112 | { { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },
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113 | { 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6 },
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114 | { 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14 },
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115 | { 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 }
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116 | },
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117 |
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118 | { { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },
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119 | { 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8 },
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120 | { 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6 },
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121 | { 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 }
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122 | },
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123 |
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124 | { { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },
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125 | { 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6 },
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126 | { 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2 },
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127 | { 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 }
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128 | },
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129 |
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130 | { { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },
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131 | { 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2 },
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132 | { 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8 },
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133 | { 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 }
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134 | }
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135 | };
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136 |
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137 | #ifdef notdef
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138 |
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139 | /* This is the initial permutation matrix -- we have no
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140 | use for it, but it is needed if you will develop
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141 | this module into a general DES package.
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142 | */
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143 | static unsigned char inital_perm[64] =
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144 | { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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145 | 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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146 | 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
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147 | 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
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148 | };
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149 |
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150 | #endif
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151 |
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152 | /* Final permutation matrix -- not used directly */
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153 | static unsigned char final_perm[64] =
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154 | { 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31,
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155 | 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29,
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156 | 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27,
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157 | 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25
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158 | };
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159 |
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160 | /* The 16 DES keys in BITMASK format */
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161 | unsigned long keytab[16][2];
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162 |
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163 | #define ascii_to_bin(c) ((c)>='a'?(c-59):(c)>='A'?((c)-53):(c)-'.')
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164 | #define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.')
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165 |
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166 | /* Macro to set a bit (0..23) */
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167 | #define BITMASK(i) ( (1<<(11-(i)%12+3)) << ((i)<12?16:0) )
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168 |
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169 | /* sb arrays:
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170 |
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171 | Workhorses of the inner loop of the DES implementation.
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172 | They do sbox lookup, shifting of this value, 32 bit
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173 | permutation and E permutation for the next round.
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174 |
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175 | Kept in 'BITMASK' format.
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176 |
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177 | */
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178 |
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179 | unsigned long sb0[8192],sb1[8192],sb2[8192],sb3[8192];
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180 | static unsigned long *sb[4] = {sb0,sb1,sb2,sb3};
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181 |
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182 | /* eperm32tab: do 32 bit permutation and E selection
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183 |
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184 | The first index is the byte number in the 32 bit value to be permuted
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185 | - second - is the value of this byte
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186 | - third - selects the two 32 bit values
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187 |
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188 | The table is used and generated internally in init_des to speed it up
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189 |
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190 | */
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191 | static unsigned long eperm32tab[4][256][2];
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192 |
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193 | /* mk_keytab_table: fast way of generating keytab from ASCII key
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194 |
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195 | The first index is the byte number in the 8 byte ASCII key
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196 | - second - - - current DES round i.e. the key number
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197 | - third - distinguishes between the two 24 bit halfs of
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198 | the selected key
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199 | - fourth - selects the 7 bits actually used of each byte
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200 |
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201 | The table is kept in the format generated by the BITMASK macro
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202 |
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203 | */
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204 | static unsigned long mk_keytab_table[8][16][2][128];
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205 |
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206 |
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207 | /* efp: undo an extra e selection and do final
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208 | permutation giving the DES result.
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209 |
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210 | Invoked 6 bit a time on two 48 bit values
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211 | giving two 32 bit longs.
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212 | */
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213 | static unsigned long efp[16][64][2];
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214 |
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215 |
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216 | static unsigned char bytemask[8] =
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217 | { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
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218 |
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219 |
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220 | static unsigned long longmask[32] =
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221 | { 0x80000000, 0x40000000, 0x20000000, 0x10000000,
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222 | 0x08000000, 0x04000000, 0x02000000, 0x01000000,
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223 | 0x00800000, 0x00400000, 0x00200000, 0x00100000,
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224 | 0x00080000, 0x00040000, 0x00020000, 0x00010000,
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225 | 0x00008000, 0x00004000, 0x00002000, 0x00001000,
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226 | 0x00000800, 0x00000400, 0x00000200, 0x00000100,
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227 | 0x00000080, 0x00000040, 0x00000020, 0x00000010,
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228 | 0x00000008, 0x00000004, 0x00000002, 0x00000001
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229 | };
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230 |
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231 | #ifdef DEBUG
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232 |
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233 | /* For debugging */
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234 |
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235 | void pr_bits(a,n)
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236 | unsigned long *a;
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237 | unsigned long n;
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238 | { unsigned long i,j,t,tmp;
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239 | n/=8;
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240 | for(i=0; i<n; i++)
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241 | { tmp=0;
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242 | for(j=0; j<8; j++)
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243 | { t=8*i+j;
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244 | tmp|=(a[t/24] & BITMASK(t % 24))?bytemask[j]:0;
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245 | }
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246 | (void)printf("%02x ",tmp);
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247 | }
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248 | printf(" ");
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249 | }
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250 |
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251 | static void set_bits(v,b)
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252 | unsigned long v;
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253 | unsigned long *b;
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254 | { unsigned long i;
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255 | *b = 0;
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256 | for(i=0; i<24; i++)
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257 | if(v & longmask[8+i])
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258 | *b |= BITMASK(i);
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259 | }
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260 |
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261 | #endif
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262 |
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263 | static unsigned long initialized = 0;
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264 |
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265 | /* lookup a 6 bit value in sbox */
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266 |
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267 | #define s_lookup(i,s) sbox[(i)][(((s)>>4) & 0x2)|((s) & 0x1)][((s)>>1) & 0xf];
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268 |
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269 | /* Generate the mk_keytab_table once in a program execution */
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270 |
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271 | void init_des()
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272 | { unsigned long tbl_long,bit_within_long,comes_from_bit;
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273 | unsigned long bit,sg,j;
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274 | unsigned long bit_within_byte,key_byte,byte_value;
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275 | unsigned long round,mask;
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276 |
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277 | bzero((char*)mk_keytab_table,sizeof mk_keytab_table);
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278 |
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279 | for(round=0; round<16; round++)
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280 | for(bit=0; bit<48; bit++)
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281 | { tbl_long = bit / 24;
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282 | bit_within_long = bit % 24;
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283 |
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284 | /* from which bit in the key halves does it origin? */
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285 | comes_from_bit = pc2[bit] - 1;
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286 |
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287 | /* undo the rotation done before pc2 */
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288 | if(comes_from_bit>=28)
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289 | comes_from_bit = 28 + (comes_from_bit + totrot[round]) % 28;
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290 | else
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291 | comes_from_bit = (comes_from_bit + totrot[round]) % 28;
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292 |
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293 | /* undo the initial key half forming permutation */
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294 | comes_from_bit = pc1[comes_from_bit] - 1;
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295 |
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296 | /* Now 'comes_from_bit' is the correct number (0..55)
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297 | of the keybit from which the bit being traced
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298 | in key 'round' comes from
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299 | */
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300 |
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301 | key_byte = comes_from_bit / 8;
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302 | bit_within_byte = (comes_from_bit % 8)+1;
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303 |
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304 | mask = bytemask[bit_within_byte];
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305 |
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306 | for(byte_value=0; byte_value<128; byte_value++)
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307 | if(byte_value & mask)
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308 | mk_keytab_table[key_byte][round][tbl_long][byte_value] |=
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309 | BITMASK(bit_within_long);
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310 | }
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311 |
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312 | /* Now generate the table used to do an combined
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313 | 32 bit permutation and e expansion
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314 |
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315 | We use it because we have to permute 16384 32 bit
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316 | longs into 48 bit in order to initialize sb.
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317 |
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318 | Looping 48 rounds per permutation becomes
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319 | just too slow...
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320 |
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321 | */
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322 |
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323 | bzero((char*)eperm32tab,sizeof eperm32tab);
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324 | for(bit=0; bit<48; bit++)
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325 | { unsigned long mask1,comes_from;
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326 |
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327 | comes_from = perm32[eref[bit]-1]-1;
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328 | mask1 = bytemask[comes_from % 8];
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329 |
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330 | for(j=256; j--;)
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331 | if(j & mask1)
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332 | eperm32tab[comes_from/8][j][bit/24] |= BITMASK(bit % 24);
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333 | }
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334 |
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335 | /* Create the sb tables:
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336 |
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337 | For each 12 bit segment of an 48 bit intermediate
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338 | result, the sb table precomputes the two 4 bit
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339 | values of the sbox lookups done with the two 6
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340 | bit halves, shifts them to their proper place,
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341 | sends them through perm32 and finally E expands
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342 | them so that they are ready for the next
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343 | DES round.
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344 |
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345 | The value looked up is to be xored onto the
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346 | two 48 bit right halves.
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347 | */
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348 |
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349 | for(sg=0; sg<4; sg++)
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350 | { unsigned long j1,j2;
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351 | unsigned long s1,s2;
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352 |
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353 | for(j1=0; j1<64; j1++)
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354 | { s1 = s_lookup(2*sg,j1);
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355 | for(j2=0; j2<64; j2++)
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356 | { unsigned long to_permute,inx;
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357 |
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358 | s2 = s_lookup(2*sg+1,j2);
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359 | to_permute = ((s1<<4) | s2) << (24-8*sg);
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360 | inx = ((j1<<6) | j2) << 1;
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361 |
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362 | sb[sg][inx ] = eperm32tab[0][(to_permute >> 24) & 0xff][0];
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363 | sb[sg][inx+1] = eperm32tab[0][(to_permute >> 24) & 0xff][1];
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364 |
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365 | sb[sg][inx ] |= eperm32tab[1][(to_permute >> 16) & 0xff][0];
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366 | sb[sg][inx+1] |= eperm32tab[1][(to_permute >> 16) & 0xff][1];
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367 |
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368 | sb[sg][inx ] |= eperm32tab[2][(to_permute >> 8) & 0xff][0];
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369 | sb[sg][inx+1] |= eperm32tab[2][(to_permute >> 8) & 0xff][1];
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370 |
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371 | sb[sg][inx ] |= eperm32tab[3][(to_permute) & 0xff][0];
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372 | sb[sg][inx+1] |= eperm32tab[3][(to_permute) & 0xff][1];
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373 | }
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374 | }
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375 | }
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376 | initialized++;
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377 | }
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378 |
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379 | /* Process the elements of the sb table permuting the
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380 | bits swapped in the expansion by the current salt.
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381 | */
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382 |
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383 | void shuffle_sb(k, saltbits)
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384 | unsigned long *k, saltbits;
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385 | { int j, x;
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386 | for(j=4096; j--;) {
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387 | x = (k[0] ^ k[1]) & saltbits;
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388 | *k++ ^= x;
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389 | *k++ ^= x;
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390 | }
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391 | }
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392 |
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393 | /* Setup the unit for a new salt
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394 | Hopefully we'll not see a new salt in each crypt call.
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395 | */
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396 |
|
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397 | static unsigned char current_salt[3]="&&"; /* invalid value */
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398 | static unsigned long oldsaltbits = 0;
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399 |
|
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400 | void setup_salt(s)
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401 | char *s;
|
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402 | { unsigned long i,j,saltbits;
|
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403 |
|
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404 | if(!initialized)
|
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405 | init_des();
|
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406 |
|
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407 | if(s[0]==current_salt[0] && s[1]==current_salt[1])
|
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408 | return;
|
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409 | current_salt[0]=s[0]; current_salt[1]=s[1];
|
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410 |
|
---|
411 | /* This is the only crypt change to DES:
|
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412 | entries are swapped in the expansion table
|
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413 | according to the bits set in the salt.
|
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414 | */
|
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415 |
|
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416 | saltbits=0;
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417 | bcopy((char*)eref,(char*)disturbed_e,sizeof eref);
|
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418 | for(i=0; i<2; i++)
|
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419 | { long c=ascii_to_bin(s[i]);
|
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420 | if(c<0 || c>63)
|
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421 | c=0;
|
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422 | for(j=0; j<6; j++)
|
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423 | if((c>>j) & 0x1)
|
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424 | { disturbed_e[6*i+j ]=eref[6*i+j+24];
|
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425 | disturbed_e[6*i+j+24]=eref[6*i+j ];
|
---|
426 | saltbits |= BITMASK(6*i+j);
|
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427 | }
|
---|
428 | }
|
---|
429 |
|
---|
430 | /* Permute the sb table values
|
---|
431 | to reflect the changed e
|
---|
432 | selection table
|
---|
433 | */
|
---|
434 |
|
---|
435 | shuffle_sb(sb0, oldsaltbits ^ saltbits);
|
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436 | shuffle_sb(sb1, oldsaltbits ^ saltbits);
|
---|
437 | shuffle_sb(sb2, oldsaltbits ^ saltbits);
|
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438 | shuffle_sb(sb3, oldsaltbits ^ saltbits);
|
---|
439 |
|
---|
440 | oldsaltbits = saltbits;
|
---|
441 |
|
---|
442 | /* Create an inverse matrix for disturbed_e telling
|
---|
443 | where to plug out bits if undoing disturbed_e
|
---|
444 | */
|
---|
445 |
|
---|
446 | for(i=48; i--;)
|
---|
447 | { e_inverse[disturbed_e[i]-1 ] = i;
|
---|
448 | e_inverse[disturbed_e[i]-1+32] = i+48;
|
---|
449 | }
|
---|
450 |
|
---|
451 | /* create efp: the matrix used to
|
---|
452 | undo the E expansion and effect final permutation
|
---|
453 | */
|
---|
454 |
|
---|
455 | bzero((char*)efp,sizeof efp);
|
---|
456 | for(i=0; i<64; i++)
|
---|
457 | { unsigned long o_bit,o_long;
|
---|
458 | unsigned long word_value,mask1,mask2,comes_from_f_bit,comes_from_e_bit;
|
---|
459 | unsigned long comes_from_word,bit_within_word;
|
---|
460 |
|
---|
461 | /* See where bit i belongs in the two 32 bit long's */
|
---|
462 | o_long = i / 32; /* 0..1 */
|
---|
463 | o_bit = i % 32; /* 0..31 */
|
---|
464 |
|
---|
465 | /* And find a bit in the e permutated value setting this bit.
|
---|
466 |
|
---|
467 | Note: the e selection may have selected the same bit several
|
---|
468 | times. By the initialization of e_inverse, we only look
|
---|
469 | for one specific instance.
|
---|
470 | */
|
---|
471 | comes_from_f_bit = final_perm[i]-1; /* 0..63 */
|
---|
472 | comes_from_e_bit = e_inverse[comes_from_f_bit]; /* 0..95 */
|
---|
473 | comes_from_word = comes_from_e_bit / 6; /* 0..15 */
|
---|
474 | bit_within_word = comes_from_e_bit % 6; /* 0..5 */
|
---|
475 |
|
---|
476 | mask1 = longmask[bit_within_word+26];
|
---|
477 | mask2 = longmask[o_bit];
|
---|
478 |
|
---|
479 | for(word_value=64; word_value--;)
|
---|
480 | if(word_value & mask1)
|
---|
481 | efp[comes_from_word][word_value][o_long] |= mask2;
|
---|
482 |
|
---|
483 | }
|
---|
484 |
|
---|
485 | }
|
---|
486 |
|
---|
487 | /* Generate the key table before running the 25 DES rounds */
|
---|
488 |
|
---|
489 | void mk_keytab(key)
|
---|
490 | char *key;
|
---|
491 | { unsigned long i,j;
|
---|
492 | unsigned long *k,*mkt;
|
---|
493 | char t;
|
---|
494 |
|
---|
495 | bzero((char*)keytab, sizeof keytab);
|
---|
496 | mkt = &mk_keytab_table[0][0][0][0];
|
---|
497 |
|
---|
498 | for(i=0; (t=(*key++) & 0x7f) && i<8; i++)
|
---|
499 | for(j=0,k = &keytab[0][0]; j<16; j++)
|
---|
500 | { *k++ |= mkt[t]; mkt += 128;
|
---|
501 | *k++ |= mkt[t]; mkt += 128;
|
---|
502 | }
|
---|
503 | for(; i<8; i++)
|
---|
504 | for(j=0,k = &keytab[0][0]; j<16; j++)
|
---|
505 | { *k++ |= mkt[0]; mkt += 128;
|
---|
506 | *k++ |= mkt[0]; mkt += 128;
|
---|
507 | }
|
---|
508 | }
|
---|
509 |
|
---|
510 | /* Do final permutations and convert to ASCII */
|
---|
511 |
|
---|
512 | char *output_conversion(l1,l2,r1,r2,salt)
|
---|
513 | unsigned long l1,l2,r1,r2;
|
---|
514 | char *salt;
|
---|
515 | { static char outbuf[14];
|
---|
516 | unsigned long i;
|
---|
517 | unsigned long s,v1,v2;
|
---|
518 |
|
---|
519 | /* Unfortunately we've done an extra E
|
---|
520 | expansion -- undo it at the same time.
|
---|
521 | */
|
---|
522 |
|
---|
523 | v1=v2=0; l1 >>= 3; l2 >>= 3; r1 >>= 3; r2 >>= 3;
|
---|
524 |
|
---|
525 | v1 |= efp[ 3][ l1 & 0x3f][0]; v2 |= efp[ 3][ l1 & 0x3f][1];
|
---|
526 | v1 |= efp[ 2][(l1>>=6) & 0x3f][0]; v2 |= efp[ 2][ l1 & 0x3f][1];
|
---|
527 | v1 |= efp[ 1][(l1>>=10) & 0x3f][0]; v2 |= efp[ 1][ l1 & 0x3f][1];
|
---|
528 | v1 |= efp[ 0][(l1>>=6) & 0x3f][0]; v2 |= efp[ 0][ l1 & 0x3f][1];
|
---|
529 |
|
---|
530 | v1 |= efp[ 7][ l2 & 0x3f][0]; v2 |= efp[ 7][ l2 & 0x3f][1];
|
---|
531 | v1 |= efp[ 6][(l2>>=6) & 0x3f][0]; v2 |= efp[ 6][ l2 & 0x3f][1];
|
---|
532 | v1 |= efp[ 5][(l2>>=10) & 0x3f][0]; v2 |= efp[ 5][ l2 & 0x3f][1];
|
---|
533 | v1 |= efp[ 4][(l2>>=6) & 0x3f][0]; v2 |= efp[ 4][ l2 & 0x3f][1];
|
---|
534 |
|
---|
535 | v1 |= efp[11][ r1 & 0x3f][0]; v2 |= efp[11][ r1 & 0x3f][1];
|
---|
536 | v1 |= efp[10][(r1>>=6) & 0x3f][0]; v2 |= efp[10][ r1 & 0x3f][1];
|
---|
537 | v1 |= efp[ 9][(r1>>=10) & 0x3f][0]; v2 |= efp[ 9][ r1 & 0x3f][1];
|
---|
538 | v1 |= efp[ 8][(r1>>=6) & 0x3f][0]; v2 |= efp[ 8][ r1 & 0x3f][1];
|
---|
539 |
|
---|
540 | v1 |= efp[15][ r2 & 0x3f][0]; v2 |= efp[15][ r2 & 0x3f][1];
|
---|
541 | v1 |= efp[14][(r2>>=6) & 0x3f][0]; v2 |= efp[14][ r2 & 0x3f][1];
|
---|
542 | v1 |= efp[13][(r2>>=10) & 0x3f][0]; v2 |= efp[13][ r2 & 0x3f][1];
|
---|
543 | v1 |= efp[12][(r2>>=6) & 0x3f][0]; v2 |= efp[12][ r2 & 0x3f][1];
|
---|
544 |
|
---|
545 | outbuf[0] = salt[0];
|
---|
546 | outbuf[1] = salt[1] ? salt[1] : salt[0];
|
---|
547 |
|
---|
548 | for(i=0; i<5; i++)
|
---|
549 | outbuf[i+2] = bin_to_ascii((v1>>(26-6*i)) & 0x3f);
|
---|
550 |
|
---|
551 | s = (v2 & 0xf) << 2; /* Save the rightmost 4 bit a moment */
|
---|
552 | v2 = (v2>>2) | ((v1 & 0x3)<<30); /* Shift two bits of v1 onto v2 */
|
---|
553 |
|
---|
554 | for(i=5; i<10; i++)
|
---|
555 | outbuf[i+2] = bin_to_ascii((v2>>(56-6*i)) & 0x3f);
|
---|
556 |
|
---|
557 | outbuf[12] = bin_to_ascii(s);
|
---|
558 | outbuf[13] = 0;
|
---|
559 |
|
---|
560 | return outbuf;
|
---|
561 | }
|
---|
562 |
|
---|
563 | char *crypt();
|
---|
564 |
|
---|
565 | /* Stub to provide fcrypt compatibility */
|
---|
566 |
|
---|
567 | char *fcrypt(key, salt)
|
---|
568 | char *key;
|
---|
569 | char *salt;
|
---|
570 | { return crypt(key, salt);
|
---|
571 | }
|
---|
572 |
|
---|