1 | /* |
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2 | * FreeSec: libcrypt for NetBSD |
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3 | * |
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4 | * Copyright (c) 1994 David Burren |
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5 | * All rights reserved. |
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6 | * |
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7 | * Ported to RTEMS and made reentrant by Till Straumann, 9/2003 |
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8 | * |
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9 | * Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet |
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10 | * this file should now *only* export crypt(), in order to make |
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11 | * binaries of libcrypt exportable from the USA |
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12 | * |
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13 | * Adapted for FreeBSD-4.0 by Mark R V Murray |
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14 | * this file should now *only* export crypt_des(), in order to make |
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15 | * a module that can be optionally included in libcrypt. |
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16 | * |
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17 | * Redistribution and use in source and binary forms, with or without |
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18 | * modification, are permitted provided that the following conditions |
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19 | * are met: |
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20 | * 1. Redistributions of source code must retain the above copyright |
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21 | * notice, this list of conditions and the following disclaimer. |
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22 | * 2. Redistributions in binary form must reproduce the above copyright |
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23 | * notice, this list of conditions and the following disclaimer in the |
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24 | * documentation and/or other materials provided with the distribution. |
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25 | * 3. Neither the name of the author nor the names of other contributors |
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26 | * may be used to endorse or promote products derived from this software |
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27 | * without specific prior written permission. |
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28 | * |
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29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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39 | * SUCH DAMAGE. |
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40 | * |
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41 | * This is an original implementation of the DES and the crypt(3) interfaces |
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42 | * by David Burren <davidb@werj.com.au>. |
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43 | * |
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44 | * An excellent reference on the underlying algorithm (and related |
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45 | * algorithms) is: |
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46 | * |
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47 | * B. Schneier, Applied Cryptography: protocols, algorithms, |
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48 | * and source code in C, John Wiley & Sons, 1994. |
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49 | * |
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50 | * Note that in that book's description of DES the lookups for the initial, |
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51 | * pbox, and final permutations are inverted (this has been brought to the |
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52 | * attention of the author). A list of errata for this book has been |
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53 | * posted to the sci.crypt newsgroup by the author and is available for FTP. |
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54 | * |
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55 | * ARCHITECTURE ASSUMPTIONS: |
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56 | * It is assumed that the 8-byte arrays passed by reference can be |
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57 | * addressed as arrays of u_int32_t's (ie. the CPU is not picky about |
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58 | * alignment). |
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59 | */ |
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60 | |
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61 | #ifdef HAVE_CONFIG_H |
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62 | #include "config.h" |
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63 | #endif |
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64 | |
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65 | #define __FORCE_GLIBC |
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66 | #include <sys/cdefs.h> |
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67 | #include <sys/types.h> |
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68 | #include <sys/param.h> |
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69 | #include <netinet/in.h> |
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70 | #ifndef __rtems__ |
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71 | #include <pwd.h> |
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72 | #include <crypt.h> |
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73 | #endif |
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74 | #include <string.h> |
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75 | #include <stdlib.h> |
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76 | |
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77 | #include "des.h" |
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78 | |
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79 | #define REENTRANT |
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80 | /* Re-entrantify me -- all this junk needs to be in |
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81 | * struct crypt_data to make this really reentrant... */ |
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82 | |
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83 | /* TS; not really - only the stuff in Des_Context */ |
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84 | static struct fixed1 { |
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85 | u_char inv_key_perm[64]; |
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86 | u_char inv_comp_perm[56]; |
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87 | u_char u_sbox[8][64]; |
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88 | u_char un_pbox[32]; |
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89 | } des1_f; |
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90 | static struct fixed2 { |
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91 | u_int32_t ip_maskl[8][256], ip_maskr[8][256]; |
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92 | } des2_f; |
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93 | static struct fixed3 { |
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94 | u_int32_t fp_maskl[8][256], fp_maskr[8][256]; |
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95 | } des3_f; |
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96 | static struct fixed4 { |
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97 | u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; |
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98 | u_int32_t comp_maskl[8][128], comp_maskr[8][128]; |
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99 | } des4_f; |
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100 | |
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101 | #define inv_key_perm des1_f.inv_key_perm |
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102 | #define inv_comp_perm des1_f.inv_comp_perm |
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103 | #define u_sbox des1_f.u_sbox |
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104 | #define un_pbox des1_f.un_pbox |
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105 | #define ip_maskl des2_f.ip_maskl |
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106 | #define ip_maskr des2_f.ip_maskr |
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107 | #define fp_maskl des3_f.fp_maskl |
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108 | #define fp_maskr des3_f.fp_maskr |
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109 | #define key_perm_maskl des4_f.key_perm_maskl |
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110 | #define key_perm_maskr des4_f.key_perm_maskr |
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111 | #define comp_maskl des4_f.comp_maskl |
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112 | #define comp_maskr des4_f.comp_maskr |
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113 | |
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114 | /* These need to be maintained per-process */ |
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115 | struct Des_Context { |
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116 | u_int32_t en_keysl[16], en_keysr[16]; |
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117 | u_int32_t de_keysl[16], de_keysr[16]; |
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118 | u_int32_t saltbits; |
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119 | u_int32_t old_salt; |
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120 | u_int32_t old_rawkey0, old_rawkey1; |
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121 | }; |
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122 | |
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123 | #ifndef REENTRANT |
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124 | static struct Des_Context single; |
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125 | #endif |
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126 | |
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127 | #define en_keysl des_ctx->en_keysl |
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128 | #define en_keysr des_ctx->en_keysr |
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129 | #define de_keysl des_ctx->de_keysl |
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130 | #define de_keysr des_ctx->de_keysr |
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131 | #define saltbits des_ctx->saltbits |
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132 | #define old_salt des_ctx->old_salt |
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133 | #define old_rawkey0 des_ctx->old_rawkey0 |
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134 | #define old_rawkey1 des_ctx->old_rawkey1 |
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135 | |
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136 | /* Static stuff that stays resident and doesn't change after |
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137 | * being initialized, and therefore doesn't need to be made |
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138 | * reentrant. */ |
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139 | static u_char init_perm[64], final_perm[64]; |
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140 | static u_char m_sbox[4][4096]; |
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141 | static u_int32_t psbox[4][256]; |
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142 | |
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143 | |
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144 | |
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145 | |
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146 | /* A pile of data */ |
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147 | static const u_char ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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148 | |
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149 | static const u_char IP[64] = { |
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150 | 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, |
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151 | 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, |
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152 | 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, |
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153 | 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 |
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154 | }; |
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155 | |
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156 | static const u_char key_perm[56] = { |
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157 | 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, |
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158 | 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, |
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159 | 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, |
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160 | 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 |
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161 | }; |
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162 | |
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163 | static const u_char key_shifts[16] = { |
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164 | 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 |
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165 | }; |
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166 | |
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167 | static const u_char comp_perm[48] = { |
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168 | 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, |
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169 | 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, |
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170 | 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, |
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171 | 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 |
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172 | }; |
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173 | |
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174 | /* |
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175 | * No E box is used, as it's replaced by some ANDs, shifts, and ORs. |
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176 | */ |
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177 | |
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178 | static const u_char sbox[8][64] = { |
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179 | { |
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180 | 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, |
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181 | 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, |
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182 | 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, |
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183 | 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 |
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184 | }, |
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185 | { |
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186 | 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, |
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187 | 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, |
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188 | 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, |
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189 | 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 |
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190 | }, |
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191 | { |
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192 | 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, |
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193 | 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, |
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194 | 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, |
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195 | 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 |
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196 | }, |
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197 | { |
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198 | 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, |
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199 | 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, |
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200 | 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, |
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201 | 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 |
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202 | }, |
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203 | { |
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204 | 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, |
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205 | 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, |
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206 | 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, |
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207 | 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 |
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208 | }, |
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209 | { |
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210 | 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, |
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211 | 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, |
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212 | 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, |
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213 | 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 |
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214 | }, |
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215 | { |
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216 | 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, |
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217 | 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, |
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218 | 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, |
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219 | 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 |
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220 | }, |
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221 | { |
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222 | 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, |
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223 | 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, |
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224 | 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, |
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225 | 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 |
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226 | } |
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227 | }; |
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228 | |
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229 | static const u_char pbox[32] = { |
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230 | 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, |
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231 | 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 |
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232 | }; |
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233 | |
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234 | static const u_int32_t bits32[32] = |
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235 | { |
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236 | 0x80000000, 0x40000000, 0x20000000, 0x10000000, |
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237 | 0x08000000, 0x04000000, 0x02000000, 0x01000000, |
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238 | 0x00800000, 0x00400000, 0x00200000, 0x00100000, |
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239 | 0x00080000, 0x00040000, 0x00020000, 0x00010000, |
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240 | 0x00008000, 0x00004000, 0x00002000, 0x00001000, |
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241 | 0x00000800, 0x00000400, 0x00000200, 0x00000100, |
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242 | 0x00000080, 0x00000040, 0x00000020, 0x00000010, |
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243 | 0x00000008, 0x00000004, 0x00000002, 0x00000001 |
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244 | }; |
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245 | |
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246 | static const u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; |
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247 | static const u_int32_t *bits28, *bits24; |
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248 | |
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249 | |
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250 | static int |
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251 | ascii_to_bin(char ch) |
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252 | { |
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253 | if (ch > 'z') |
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254 | return(0); |
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255 | if (ch >= 'a') |
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256 | return(ch - 'a' + 38); |
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257 | if (ch > 'Z') |
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258 | return(0); |
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259 | if (ch >= 'A') |
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260 | return(ch - 'A' + 12); |
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261 | if (ch > '9') |
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262 | return(0); |
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263 | if (ch >= '.') |
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264 | return(ch - '.'); |
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265 | return(0); |
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266 | } |
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267 | |
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268 | static struct Des_Context * |
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269 | des_ctx_init(void) |
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270 | { |
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271 | struct Des_Context *des_ctx; |
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272 | #ifdef REENTRANT |
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273 | des_ctx = malloc(sizeof(*des_ctx)); |
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274 | #else |
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275 | des_ctx = &single; |
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276 | #endif |
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277 | old_rawkey0 = old_rawkey1 = 0L; |
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278 | saltbits = 0L; |
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279 | old_salt = 0L; |
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280 | |
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281 | return des_ctx; |
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282 | } |
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283 | |
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284 | static void |
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285 | des_init(void) |
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286 | { |
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287 | int i, j, b, k, inbit, obit; |
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288 | u_int32_t *p, *il, *ir, *fl, *fr; |
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289 | static int des_initialised = 0; |
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290 | |
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291 | if (des_initialised==1) |
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292 | return; |
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293 | |
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294 | #ifndef REENTRANT |
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295 | des_ctx_init(); |
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296 | #endif |
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297 | |
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298 | bits24 = (bits28 = bits32 + 4) + 4; |
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299 | |
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300 | /* |
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301 | * Invert the S-boxes, reordering the input bits. |
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302 | */ |
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303 | for (i = 0; i < 8; i++) |
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304 | for (j = 0; j < 64; j++) { |
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305 | b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf); |
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306 | u_sbox[i][j] = sbox[i][b]; |
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307 | } |
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308 | |
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309 | /* |
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310 | * Convert the inverted S-boxes into 4 arrays of 8 bits. |
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311 | * Each will handle 12 bits of the S-box input. |
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312 | */ |
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313 | for (b = 0; b < 4; b++) |
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314 | for (i = 0; i < 64; i++) |
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315 | for (j = 0; j < 64; j++) |
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316 | m_sbox[b][(i << 6) | j] = |
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317 | (u_char)((u_sbox[(b << 1)][i] << 4) | |
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318 | u_sbox[(b << 1) + 1][j]); |
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319 | |
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320 | /* |
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321 | * Set up the initial & final permutations into a useful form, and |
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322 | * initialise the inverted key permutation. |
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323 | */ |
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324 | for (i = 0; i < 64; i++) { |
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325 | init_perm[final_perm[i] = IP[i] - 1] = (u_char)i; |
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326 | inv_key_perm[i] = 255; |
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327 | } |
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328 | |
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329 | /* |
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330 | * Invert the key permutation and initialise the inverted key |
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331 | * compression permutation. |
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332 | */ |
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333 | for (i = 0; i < 56; i++) { |
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334 | inv_key_perm[key_perm[i] - 1] = (u_char)i; |
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335 | inv_comp_perm[i] = 255; |
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336 | } |
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337 | |
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338 | /* |
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339 | * Invert the key compression permutation. |
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340 | */ |
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341 | for (i = 0; i < 48; i++) { |
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342 | inv_comp_perm[comp_perm[i] - 1] = (u_char)i; |
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343 | } |
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344 | |
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345 | /* |
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346 | * Set up the OR-mask arrays for the initial and final permutations, |
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347 | * and for the key initial and compression permutations. |
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348 | */ |
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349 | for (k = 0; k < 8; k++) { |
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350 | for (i = 0; i < 256; i++) { |
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351 | *(il = &ip_maskl[k][i]) = 0L; |
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352 | *(ir = &ip_maskr[k][i]) = 0L; |
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353 | *(fl = &fp_maskl[k][i]) = 0L; |
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354 | *(fr = &fp_maskr[k][i]) = 0L; |
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355 | for (j = 0; j < 8; j++) { |
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356 | inbit = 8 * k + j; |
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357 | if (i & bits8[j]) { |
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358 | if ((obit = init_perm[inbit]) < 32) |
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359 | *il |= bits32[obit]; |
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360 | else |
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361 | *ir |= bits32[obit-32]; |
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362 | if ((obit = final_perm[inbit]) < 32) |
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363 | *fl |= bits32[obit]; |
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364 | else |
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365 | *fr |= bits32[obit - 32]; |
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366 | } |
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367 | } |
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368 | } |
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369 | for (i = 0; i < 128; i++) { |
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370 | *(il = &key_perm_maskl[k][i]) = 0L; |
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371 | *(ir = &key_perm_maskr[k][i]) = 0L; |
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372 | for (j = 0; j < 7; j++) { |
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373 | inbit = 8 * k + j; |
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374 | if (i & bits8[j + 1]) { |
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375 | if ((obit = inv_key_perm[inbit]) == 255) |
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376 | continue; |
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377 | if (obit < 28) |
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378 | *il |= bits28[obit]; |
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379 | else |
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380 | *ir |= bits28[obit - 28]; |
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381 | } |
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382 | } |
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383 | *(il = &comp_maskl[k][i]) = 0L; |
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384 | *(ir = &comp_maskr[k][i]) = 0L; |
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385 | for (j = 0; j < 7; j++) { |
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386 | inbit = 7 * k + j; |
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387 | if (i & bits8[j + 1]) { |
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388 | if ((obit=inv_comp_perm[inbit]) == 255) |
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389 | continue; |
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390 | if (obit < 24) |
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391 | *il |= bits24[obit]; |
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392 | else |
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393 | *ir |= bits24[obit - 24]; |
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394 | } |
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395 | } |
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396 | } |
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397 | } |
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398 | |
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399 | /* |
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400 | * Invert the P-box permutation, and convert into OR-masks for |
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401 | * handling the output of the S-box arrays setup above. |
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402 | */ |
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403 | for (i = 0; i < 32; i++) |
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404 | un_pbox[pbox[i] - 1] = (u_char)i; |
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405 | |
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406 | for (b = 0; b < 4; b++) |
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407 | for (i = 0; i < 256; i++) { |
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408 | *(p = &psbox[b][i]) = 0L; |
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409 | for (j = 0; j < 8; j++) { |
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410 | if (i & bits8[j]) |
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411 | *p |= bits32[un_pbox[8 * b + j]]; |
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412 | } |
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413 | } |
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414 | |
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415 | des_initialised = 1; |
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416 | } |
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417 | |
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418 | |
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419 | static void |
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420 | setup_salt(long salt, struct Des_Context *des_ctx) |
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421 | { |
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422 | u_int32_t obit, saltbit; |
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423 | int i; |
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424 | |
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425 | if (salt == old_salt) |
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426 | return; |
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427 | old_salt = salt; |
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428 | |
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429 | saltbits = 0L; |
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430 | saltbit = 1; |
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431 | obit = 0x800000; |
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432 | for (i = 0; i < 24; i++) { |
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433 | if (salt & saltbit) |
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434 | saltbits |= obit; |
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435 | saltbit <<= 1; |
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436 | obit >>= 1; |
---|
437 | } |
---|
438 | } |
---|
439 | |
---|
440 | |
---|
441 | static int |
---|
442 | des_setkey(const char *key, struct Des_Context *des_ctx) |
---|
443 | { |
---|
444 | u_int32_t k0, k1, rawkey0, rawkey1; |
---|
445 | int shifts, round; |
---|
446 | |
---|
447 | des_init(); |
---|
448 | |
---|
449 | rawkey0 = ntohl(*(const u_int32_t *) key); |
---|
450 | rawkey1 = ntohl(*(const u_int32_t *) (key + 4)); |
---|
451 | |
---|
452 | if ((rawkey0 | rawkey1) |
---|
453 | && rawkey0 == old_rawkey0 |
---|
454 | && rawkey1 == old_rawkey1) { |
---|
455 | /* |
---|
456 | * Already setup for this key. |
---|
457 | * This optimisation fails on a zero key (which is weak and |
---|
458 | * has bad parity anyway) in order to simplify the starting |
---|
459 | * conditions. |
---|
460 | */ |
---|
461 | return(0); |
---|
462 | } |
---|
463 | old_rawkey0 = rawkey0; |
---|
464 | old_rawkey1 = rawkey1; |
---|
465 | |
---|
466 | /* |
---|
467 | * Do key permutation and split into two 28-bit subkeys. |
---|
468 | */ |
---|
469 | k0 = key_perm_maskl[0][rawkey0 >> 25] |
---|
470 | | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f] |
---|
471 | | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f] |
---|
472 | | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f] |
---|
473 | | key_perm_maskl[4][rawkey1 >> 25] |
---|
474 | | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f] |
---|
475 | | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f] |
---|
476 | | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f]; |
---|
477 | k1 = key_perm_maskr[0][rawkey0 >> 25] |
---|
478 | | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f] |
---|
479 | | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f] |
---|
480 | | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f] |
---|
481 | | key_perm_maskr[4][rawkey1 >> 25] |
---|
482 | | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f] |
---|
483 | | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f] |
---|
484 | | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f]; |
---|
485 | /* |
---|
486 | * Rotate subkeys and do compression permutation. |
---|
487 | */ |
---|
488 | shifts = 0; |
---|
489 | for (round = 0; round < 16; round++) { |
---|
490 | u_int32_t t0, t1; |
---|
491 | |
---|
492 | shifts += key_shifts[round]; |
---|
493 | |
---|
494 | t0 = (k0 << shifts) | (k0 >> (28 - shifts)); |
---|
495 | t1 = (k1 << shifts) | (k1 >> (28 - shifts)); |
---|
496 | |
---|
497 | de_keysl[15 - round] = |
---|
498 | en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f] |
---|
499 | | comp_maskl[1][(t0 >> 14) & 0x7f] |
---|
500 | | comp_maskl[2][(t0 >> 7) & 0x7f] |
---|
501 | | comp_maskl[3][t0 & 0x7f] |
---|
502 | | comp_maskl[4][(t1 >> 21) & 0x7f] |
---|
503 | | comp_maskl[5][(t1 >> 14) & 0x7f] |
---|
504 | | comp_maskl[6][(t1 >> 7) & 0x7f] |
---|
505 | | comp_maskl[7][t1 & 0x7f]; |
---|
506 | |
---|
507 | de_keysr[15 - round] = |
---|
508 | en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f] |
---|
509 | | comp_maskr[1][(t0 >> 14) & 0x7f] |
---|
510 | | comp_maskr[2][(t0 >> 7) & 0x7f] |
---|
511 | | comp_maskr[3][t0 & 0x7f] |
---|
512 | | comp_maskr[4][(t1 >> 21) & 0x7f] |
---|
513 | | comp_maskr[5][(t1 >> 14) & 0x7f] |
---|
514 | | comp_maskr[6][(t1 >> 7) & 0x7f] |
---|
515 | | comp_maskr[7][t1 & 0x7f]; |
---|
516 | } |
---|
517 | return(0); |
---|
518 | } |
---|
519 | |
---|
520 | |
---|
521 | static int |
---|
522 | do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count, struct Des_Context *des_ctx) |
---|
523 | { |
---|
524 | /* |
---|
525 | * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format. |
---|
526 | */ |
---|
527 | u_int32_t l, r, *kl, *kr, *kl1, *kr1; |
---|
528 | u_int32_t f, r48l, r48r; |
---|
529 | int round; |
---|
530 | |
---|
531 | if (count == 0) { |
---|
532 | return(1); |
---|
533 | } else if (count > 0) { |
---|
534 | /* |
---|
535 | * Encrypting |
---|
536 | */ |
---|
537 | kl1 = en_keysl; |
---|
538 | kr1 = en_keysr; |
---|
539 | } else { |
---|
540 | /* |
---|
541 | * Decrypting |
---|
542 | */ |
---|
543 | count = -count; |
---|
544 | kl1 = de_keysl; |
---|
545 | kr1 = de_keysr; |
---|
546 | } |
---|
547 | |
---|
548 | /* |
---|
549 | * Do initial permutation (IP). |
---|
550 | */ |
---|
551 | l = ip_maskl[0][l_in >> 24] |
---|
552 | | ip_maskl[1][(l_in >> 16) & 0xff] |
---|
553 | | ip_maskl[2][(l_in >> 8) & 0xff] |
---|
554 | | ip_maskl[3][l_in & 0xff] |
---|
555 | | ip_maskl[4][r_in >> 24] |
---|
556 | | ip_maskl[5][(r_in >> 16) & 0xff] |
---|
557 | | ip_maskl[6][(r_in >> 8) & 0xff] |
---|
558 | | ip_maskl[7][r_in & 0xff]; |
---|
559 | r = ip_maskr[0][l_in >> 24] |
---|
560 | | ip_maskr[1][(l_in >> 16) & 0xff] |
---|
561 | | ip_maskr[2][(l_in >> 8) & 0xff] |
---|
562 | | ip_maskr[3][l_in & 0xff] |
---|
563 | | ip_maskr[4][r_in >> 24] |
---|
564 | | ip_maskr[5][(r_in >> 16) & 0xff] |
---|
565 | | ip_maskr[6][(r_in >> 8) & 0xff] |
---|
566 | | ip_maskr[7][r_in & 0xff]; |
---|
567 | |
---|
568 | while (count--) { |
---|
569 | /* |
---|
570 | * Do each round. |
---|
571 | */ |
---|
572 | kl = kl1; |
---|
573 | kr = kr1; |
---|
574 | round = 16; |
---|
575 | while (round--) { |
---|
576 | /* |
---|
577 | * Expand R to 48 bits (simulate the E-box). |
---|
578 | */ |
---|
579 | r48l = ((r & 0x00000001) << 23) |
---|
580 | | ((r & 0xf8000000) >> 9) |
---|
581 | | ((r & 0x1f800000) >> 11) |
---|
582 | | ((r & 0x01f80000) >> 13) |
---|
583 | | ((r & 0x001f8000) >> 15); |
---|
584 | |
---|
585 | r48r = ((r & 0x0001f800) << 7) |
---|
586 | | ((r & 0x00001f80) << 5) |
---|
587 | | ((r & 0x000001f8) << 3) |
---|
588 | | ((r & 0x0000001f) << 1) |
---|
589 | | ((r & 0x80000000) >> 31); |
---|
590 | /* |
---|
591 | * Do salting for crypt() and friends, and |
---|
592 | * XOR with the permuted key. |
---|
593 | */ |
---|
594 | f = (r48l ^ r48r) & saltbits; |
---|
595 | r48l ^= f ^ *kl++; |
---|
596 | r48r ^= f ^ *kr++; |
---|
597 | /* |
---|
598 | * Do sbox lookups (which shrink it back to 32 bits) |
---|
599 | * and do the pbox permutation at the same time. |
---|
600 | */ |
---|
601 | f = psbox[0][m_sbox[0][r48l >> 12]] |
---|
602 | | psbox[1][m_sbox[1][r48l & 0xfff]] |
---|
603 | | psbox[2][m_sbox[2][r48r >> 12]] |
---|
604 | | psbox[3][m_sbox[3][r48r & 0xfff]]; |
---|
605 | /* |
---|
606 | * Now that we've permuted things, complete f(). |
---|
607 | */ |
---|
608 | f ^= l; |
---|
609 | l = r; |
---|
610 | r = f; |
---|
611 | } |
---|
612 | r = l; |
---|
613 | l = f; |
---|
614 | } |
---|
615 | /* |
---|
616 | * Do final permutation (inverse of IP). |
---|
617 | */ |
---|
618 | *l_out = fp_maskl[0][l >> 24] |
---|
619 | | fp_maskl[1][(l >> 16) & 0xff] |
---|
620 | | fp_maskl[2][(l >> 8) & 0xff] |
---|
621 | | fp_maskl[3][l & 0xff] |
---|
622 | | fp_maskl[4][r >> 24] |
---|
623 | | fp_maskl[5][(r >> 16) & 0xff] |
---|
624 | | fp_maskl[6][(r >> 8) & 0xff] |
---|
625 | | fp_maskl[7][r & 0xff]; |
---|
626 | *r_out = fp_maskr[0][l >> 24] |
---|
627 | | fp_maskr[1][(l >> 16) & 0xff] |
---|
628 | | fp_maskr[2][(l >> 8) & 0xff] |
---|
629 | | fp_maskr[3][l & 0xff] |
---|
630 | | fp_maskr[4][r >> 24] |
---|
631 | | fp_maskr[5][(r >> 16) & 0xff] |
---|
632 | | fp_maskr[6][(r >> 8) & 0xff] |
---|
633 | | fp_maskr[7][r & 0xff]; |
---|
634 | return(0); |
---|
635 | } |
---|
636 | |
---|
637 | |
---|
638 | #if 0 |
---|
639 | static int |
---|
640 | des_cipher(const char *in, char *out, u_int32_t salt, int count) |
---|
641 | { |
---|
642 | u_int32_t l_out, r_out, rawl, rawr; |
---|
643 | int retval; |
---|
644 | union { |
---|
645 | u_int32_t *ui32; |
---|
646 | const char *c; |
---|
647 | } trans; |
---|
648 | |
---|
649 | des_init(); |
---|
650 | |
---|
651 | setup_salt(salt); |
---|
652 | |
---|
653 | trans.c = in; |
---|
654 | rawl = ntohl(*trans.ui32++); |
---|
655 | rawr = ntohl(*trans.ui32); |
---|
656 | |
---|
657 | retval = do_des(rawl, rawr, &l_out, &r_out, count); |
---|
658 | |
---|
659 | trans.c = out; |
---|
660 | *trans.ui32++ = htonl(l_out); |
---|
661 | *trans.ui32 = htonl(r_out); |
---|
662 | return(retval); |
---|
663 | } |
---|
664 | #endif |
---|
665 | |
---|
666 | |
---|
667 | #ifndef REENTRANT |
---|
668 | void |
---|
669 | setkey(const char *key) |
---|
670 | { |
---|
671 | int i, j; |
---|
672 | u_int32_t packed_keys[2]; |
---|
673 | u_char *p; |
---|
674 | |
---|
675 | p = (u_char *) packed_keys; |
---|
676 | |
---|
677 | for (i = 0; i < 8; i++) { |
---|
678 | p[i] = 0; |
---|
679 | for (j = 0; j < 8; j++) |
---|
680 | if (*key++ & 1) |
---|
681 | p[i] |= bits8[j]; |
---|
682 | } |
---|
683 | des_setkey(p, &single); |
---|
684 | } |
---|
685 | #endif |
---|
686 | |
---|
687 | |
---|
688 | #ifndef REENTRANT |
---|
689 | void |
---|
690 | encrypt(char *block, int flag) |
---|
691 | { |
---|
692 | u_int32_t io[2]; |
---|
693 | u_char *p; |
---|
694 | int i, j; |
---|
695 | |
---|
696 | des_init(); |
---|
697 | |
---|
698 | setup_salt(0L, &single); |
---|
699 | p = block; |
---|
700 | for (i = 0; i < 2; i++) { |
---|
701 | io[i] = 0L; |
---|
702 | for (j = 0; j < 32; j++) |
---|
703 | if (*p++ & 1) |
---|
704 | io[i] |= bits32[j]; |
---|
705 | } |
---|
706 | do_des(io[0], io[1], io, io + 1, flag ? -1 : 1, &single); |
---|
707 | for (i = 0; i < 2; i++) |
---|
708 | for (j = 0; j < 32; j++) |
---|
709 | block[(i << 5) | j] = (io[i] & bits32[j]) ? 1 : 0; |
---|
710 | } |
---|
711 | |
---|
712 | #endif |
---|
713 | |
---|
714 | char * |
---|
715 | __des_crypt_r(const char *key, const char *setting, char *output, int sz) |
---|
716 | { |
---|
717 | char *rval = 0; |
---|
718 | struct Des_Context *des_ctx; |
---|
719 | u_int32_t count, salt, l, r0, r1, keybuf[2]; |
---|
720 | u_char *p, *q; |
---|
721 | |
---|
722 | if (sz < 21) |
---|
723 | return NULL; |
---|
724 | |
---|
725 | des_init(); |
---|
726 | des_ctx = des_ctx_init(); |
---|
727 | |
---|
728 | /* |
---|
729 | * Copy the key, shifting each character up by one bit |
---|
730 | * and padding with zeros. |
---|
731 | */ |
---|
732 | q = (u_char *)keybuf; |
---|
733 | while (q - (u_char *)keybuf - 8) { |
---|
734 | *q++ = *key << 1; |
---|
735 | if (*(q - 1)) |
---|
736 | key++; |
---|
737 | } |
---|
738 | if (des_setkey((char *)keybuf, des_ctx)) |
---|
739 | goto bailout; |
---|
740 | |
---|
741 | #if 0 |
---|
742 | if (*setting == _PASSWORD_EFMT1) { |
---|
743 | int i; |
---|
744 | /* |
---|
745 | * "new"-style: |
---|
746 | * setting - underscore, 4 bytes of count, 4 bytes of salt |
---|
747 | * key - unlimited characters |
---|
748 | */ |
---|
749 | for (i = 1, count = 0L; i < 5; i++) |
---|
750 | count |= ascii_to_bin(setting[i]) << ((i - 1) * 6); |
---|
751 | |
---|
752 | for (i = 5, salt = 0L; i < 9; i++) |
---|
753 | salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6); |
---|
754 | |
---|
755 | while (*key) { |
---|
756 | /* |
---|
757 | * Encrypt the key with itself. |
---|
758 | */ |
---|
759 | if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1)) |
---|
760 | goto bailout; |
---|
761 | /* |
---|
762 | * And XOR with the next 8 characters of the key. |
---|
763 | */ |
---|
764 | q = (u_char *)keybuf; |
---|
765 | while (q - (u_char *)keybuf - 8 && *key) |
---|
766 | *q++ ^= *key++ << 1; |
---|
767 | |
---|
768 | if (des_setkey((char *)keybuf)) |
---|
769 | goto bailout; |
---|
770 | } |
---|
771 | strncpy(output, setting, 9); |
---|
772 | |
---|
773 | /* |
---|
774 | * Double check that we weren't given a short setting. |
---|
775 | * If we were, the above code will probably have created |
---|
776 | * wierd values for count and salt, but we don't really care. |
---|
777 | * Just make sure the output string doesn't have an extra |
---|
778 | * NUL in it. |
---|
779 | */ |
---|
780 | output[9] = '\0'; |
---|
781 | p = (u_char *)output + strlen(output); |
---|
782 | } else |
---|
783 | #endif |
---|
784 | { |
---|
785 | /* |
---|
786 | * "old"-style: |
---|
787 | * setting - 2 bytes of salt |
---|
788 | * key - up to 8 characters |
---|
789 | */ |
---|
790 | count = 25; |
---|
791 | |
---|
792 | salt = (ascii_to_bin(setting[1]) << 6) |
---|
793 | | ascii_to_bin(setting[0]); |
---|
794 | |
---|
795 | output[0] = setting[0]; |
---|
796 | /* |
---|
797 | * If the encrypted password that the salt was extracted from |
---|
798 | * is only 1 character long, the salt will be corrupted. We |
---|
799 | * need to ensure that the output string doesn't have an extra |
---|
800 | * NUL in it! |
---|
801 | */ |
---|
802 | output[1] = setting[1] ? setting[1] : output[0]; |
---|
803 | |
---|
804 | p = (u_char *)output + 2; |
---|
805 | } |
---|
806 | setup_salt(salt, des_ctx); |
---|
807 | /* |
---|
808 | * Do it. |
---|
809 | */ |
---|
810 | if (do_des(0L, 0L, &r0, &r1, (int)count, des_ctx)) |
---|
811 | goto bailout; |
---|
812 | /* |
---|
813 | * Now encode the result... |
---|
814 | */ |
---|
815 | l = (r0 >> 8); |
---|
816 | *p++ = ascii64[(l >> 18) & 0x3f]; |
---|
817 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
818 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
819 | *p++ = ascii64[l & 0x3f]; |
---|
820 | |
---|
821 | l = (r0 << 16) | ((r1 >> 16) & 0xffff); |
---|
822 | *p++ = ascii64[(l >> 18) & 0x3f]; |
---|
823 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
824 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
825 | *p++ = ascii64[l & 0x3f]; |
---|
826 | |
---|
827 | l = r1 << 2; |
---|
828 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
829 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
830 | *p++ = ascii64[l & 0x3f]; |
---|
831 | *p = 0; |
---|
832 | |
---|
833 | rval = output; |
---|
834 | bailout: |
---|
835 | free(des_ctx); |
---|
836 | return rval; |
---|
837 | } |
---|
838 | |
---|
839 | #ifdef DEBUG |
---|
840 | |
---|
841 | void |
---|
842 | des_snap(void **pf, void **pd) |
---|
843 | { |
---|
844 | uint8* pfc; |
---|
845 | *pf = malloc(sizeof(struct fixed1) + sizeof(struct fixed2) + sizeof(struct fixed3) + sizeof(struct fixed4)); |
---|
846 | pfc = *pf; |
---|
847 | memcpy(pfc, &des1_f, sizeof(des1_f)); |
---|
848 | pfc += sizeof(des1_f); |
---|
849 | memcpy(pfc, &des2_f, sizeof(des2_f)); |
---|
850 | pfc += sizeof(des2_f); |
---|
851 | memcpy(pfc, &des3_f, sizeof(des3_f)); |
---|
852 | pfc += sizeof(des3_f); |
---|
853 | memcpy(pfc, &des4_f, sizeof(des4_f)); |
---|
854 | // *pd = malloc(sizeof(struct Des_Context)); |
---|
855 | // memcpy(*pd, &des_ctx, sizeof(des_ctx)); |
---|
856 | } |
---|
857 | |
---|
858 | void |
---|
859 | des_check(void *pf, void *pd) |
---|
860 | { |
---|
861 | uint8* pfc1, pfc2, pfc3, pfc4; |
---|
862 | pfc1 = pf; |
---|
863 | pfc2 = pfc1 + sizeof(des1_f); |
---|
864 | pfc3 = pfc2 + sizeof(des2_f); |
---|
865 | pfc4 = pfc3 + sizeof(des3_f); |
---|
866 | printf("Fixed: do%s differ"/*", Context: do%s differ"*/"\n", |
---|
867 | (memcmp(pfc1, &des1_f, sizeof(des1_f)) || |
---|
868 | memcmp(pfc2, &des2_f, sizeof(des2_f)) || |
---|
869 | memcmp(pfc3, &des4_f, sizeof(des3_f)) || |
---|
870 | memcmp(pfc4, &des4_f, sizeof(des4_f))) ? "" : "nt"); |
---|
871 | } |
---|
872 | |
---|
873 | #endif |
---|