1 | /*
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2 | * FIPS-46-3 compliant Triple-DES implementation
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3 | *
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4 | * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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5 | *
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6 | * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
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7 | *
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without
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11 | * modification, are permitted provided that the following conditions
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12 | * are met:
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13 | *
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14 | * * Redistributions of source code must retain the above copyright
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15 | * notice, this list of conditions and the following disclaimer.
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16 | * * Redistributions in binary form must reproduce the above copyright
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17 | * notice, this list of conditions and the following disclaimer in the
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18 | * documentation and/or other materials provided with the distribution.
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19 | * * Neither the names of PolarSSL or XySSL nor the names of its contributors
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20 | * may be used to endorse or promote products derived from this software
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21 | * without specific prior written permission.
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22 | *
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23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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24 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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26 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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27 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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29 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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30 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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31 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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32 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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33 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 | */
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35 | /*
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36 | * DES, on which TDES is based, was originally designed by Horst Feistel
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37 | * at IBM in 1974, and was adopted as a standard by NIST (formerly NBS).
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38 | *
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39 | * http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf
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40 | */
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41 |
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42 | #include "netif/ppp/ppp_opts.h"
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43 | #if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES
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44 |
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45 | #include "netif/ppp/polarssl/des.h"
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46 |
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47 | /*
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48 | * 32-bit integer manipulation macros (big endian)
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49 | */
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50 | #ifndef GET_ULONG_BE
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51 | #define GET_ULONG_BE(n,b,i) \
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52 | { \
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53 | (n) = ( (unsigned long) (b)[(i) ] << 24 ) \
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54 | | ( (unsigned long) (b)[(i) + 1] << 16 ) \
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55 | | ( (unsigned long) (b)[(i) + 2] << 8 ) \
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56 | | ( (unsigned long) (b)[(i) + 3] ); \
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57 | }
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58 | #endif
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59 |
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60 | #ifndef PUT_ULONG_BE
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61 | #define PUT_ULONG_BE(n,b,i) \
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62 | { \
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63 | (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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64 | (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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65 | (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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66 | (b)[(i) + 3] = (unsigned char) ( (n) ); \
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67 | }
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68 | #endif
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69 |
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70 | /*
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71 | * Expanded DES S-boxes
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72 | */
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73 | static const unsigned long SB1[64] =
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74 | {
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75 | 0x01010400, 0x00000000, 0x00010000, 0x01010404,
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76 | 0x01010004, 0x00010404, 0x00000004, 0x00010000,
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77 | 0x00000400, 0x01010400, 0x01010404, 0x00000400,
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78 | 0x01000404, 0x01010004, 0x01000000, 0x00000004,
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79 | 0x00000404, 0x01000400, 0x01000400, 0x00010400,
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80 | 0x00010400, 0x01010000, 0x01010000, 0x01000404,
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81 | 0x00010004, 0x01000004, 0x01000004, 0x00010004,
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82 | 0x00000000, 0x00000404, 0x00010404, 0x01000000,
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83 | 0x00010000, 0x01010404, 0x00000004, 0x01010000,
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84 | 0x01010400, 0x01000000, 0x01000000, 0x00000400,
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85 | 0x01010004, 0x00010000, 0x00010400, 0x01000004,
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86 | 0x00000400, 0x00000004, 0x01000404, 0x00010404,
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87 | 0x01010404, 0x00010004, 0x01010000, 0x01000404,
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88 | 0x01000004, 0x00000404, 0x00010404, 0x01010400,
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89 | 0x00000404, 0x01000400, 0x01000400, 0x00000000,
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90 | 0x00010004, 0x00010400, 0x00000000, 0x01010004
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91 | };
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92 |
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93 | static const unsigned long SB2[64] =
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94 | {
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95 | 0x80108020, 0x80008000, 0x00008000, 0x00108020,
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96 | 0x00100000, 0x00000020, 0x80100020, 0x80008020,
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97 | 0x80000020, 0x80108020, 0x80108000, 0x80000000,
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98 | 0x80008000, 0x00100000, 0x00000020, 0x80100020,
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99 | 0x00108000, 0x00100020, 0x80008020, 0x00000000,
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100 | 0x80000000, 0x00008000, 0x00108020, 0x80100000,
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101 | 0x00100020, 0x80000020, 0x00000000, 0x00108000,
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102 | 0x00008020, 0x80108000, 0x80100000, 0x00008020,
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103 | 0x00000000, 0x00108020, 0x80100020, 0x00100000,
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104 | 0x80008020, 0x80100000, 0x80108000, 0x00008000,
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105 | 0x80100000, 0x80008000, 0x00000020, 0x80108020,
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106 | 0x00108020, 0x00000020, 0x00008000, 0x80000000,
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107 | 0x00008020, 0x80108000, 0x00100000, 0x80000020,
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108 | 0x00100020, 0x80008020, 0x80000020, 0x00100020,
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109 | 0x00108000, 0x00000000, 0x80008000, 0x00008020,
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110 | 0x80000000, 0x80100020, 0x80108020, 0x00108000
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111 | };
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112 |
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113 | static const unsigned long SB3[64] =
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114 | {
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115 | 0x00000208, 0x08020200, 0x00000000, 0x08020008,
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116 | 0x08000200, 0x00000000, 0x00020208, 0x08000200,
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117 | 0x00020008, 0x08000008, 0x08000008, 0x00020000,
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118 | 0x08020208, 0x00020008, 0x08020000, 0x00000208,
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119 | 0x08000000, 0x00000008, 0x08020200, 0x00000200,
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120 | 0x00020200, 0x08020000, 0x08020008, 0x00020208,
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121 | 0x08000208, 0x00020200, 0x00020000, 0x08000208,
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122 | 0x00000008, 0x08020208, 0x00000200, 0x08000000,
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123 | 0x08020200, 0x08000000, 0x00020008, 0x00000208,
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124 | 0x00020000, 0x08020200, 0x08000200, 0x00000000,
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125 | 0x00000200, 0x00020008, 0x08020208, 0x08000200,
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126 | 0x08000008, 0x00000200, 0x00000000, 0x08020008,
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127 | 0x08000208, 0x00020000, 0x08000000, 0x08020208,
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128 | 0x00000008, 0x00020208, 0x00020200, 0x08000008,
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129 | 0x08020000, 0x08000208, 0x00000208, 0x08020000,
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130 | 0x00020208, 0x00000008, 0x08020008, 0x00020200
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131 | };
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132 |
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133 | static const unsigned long SB4[64] =
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134 | {
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135 | 0x00802001, 0x00002081, 0x00002081, 0x00000080,
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136 | 0x00802080, 0x00800081, 0x00800001, 0x00002001,
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137 | 0x00000000, 0x00802000, 0x00802000, 0x00802081,
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138 | 0x00000081, 0x00000000, 0x00800080, 0x00800001,
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139 | 0x00000001, 0x00002000, 0x00800000, 0x00802001,
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140 | 0x00000080, 0x00800000, 0x00002001, 0x00002080,
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141 | 0x00800081, 0x00000001, 0x00002080, 0x00800080,
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142 | 0x00002000, 0x00802080, 0x00802081, 0x00000081,
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143 | 0x00800080, 0x00800001, 0x00802000, 0x00802081,
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144 | 0x00000081, 0x00000000, 0x00000000, 0x00802000,
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145 | 0x00002080, 0x00800080, 0x00800081, 0x00000001,
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146 | 0x00802001, 0x00002081, 0x00002081, 0x00000080,
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147 | 0x00802081, 0x00000081, 0x00000001, 0x00002000,
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148 | 0x00800001, 0x00002001, 0x00802080, 0x00800081,
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149 | 0x00002001, 0x00002080, 0x00800000, 0x00802001,
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150 | 0x00000080, 0x00800000, 0x00002000, 0x00802080
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151 | };
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152 |
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153 | static const unsigned long SB5[64] =
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154 | {
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155 | 0x00000100, 0x02080100, 0x02080000, 0x42000100,
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156 | 0x00080000, 0x00000100, 0x40000000, 0x02080000,
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157 | 0x40080100, 0x00080000, 0x02000100, 0x40080100,
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158 | 0x42000100, 0x42080000, 0x00080100, 0x40000000,
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159 | 0x02000000, 0x40080000, 0x40080000, 0x00000000,
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160 | 0x40000100, 0x42080100, 0x42080100, 0x02000100,
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161 | 0x42080000, 0x40000100, 0x00000000, 0x42000000,
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162 | 0x02080100, 0x02000000, 0x42000000, 0x00080100,
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163 | 0x00080000, 0x42000100, 0x00000100, 0x02000000,
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164 | 0x40000000, 0x02080000, 0x42000100, 0x40080100,
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165 | 0x02000100, 0x40000000, 0x42080000, 0x02080100,
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166 | 0x40080100, 0x00000100, 0x02000000, 0x42080000,
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167 | 0x42080100, 0x00080100, 0x42000000, 0x42080100,
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168 | 0x02080000, 0x00000000, 0x40080000, 0x42000000,
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169 | 0x00080100, 0x02000100, 0x40000100, 0x00080000,
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170 | 0x00000000, 0x40080000, 0x02080100, 0x40000100
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171 | };
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172 |
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173 | static const unsigned long SB6[64] =
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174 | {
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175 | 0x20000010, 0x20400000, 0x00004000, 0x20404010,
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176 | 0x20400000, 0x00000010, 0x20404010, 0x00400000,
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177 | 0x20004000, 0x00404010, 0x00400000, 0x20000010,
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178 | 0x00400010, 0x20004000, 0x20000000, 0x00004010,
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179 | 0x00000000, 0x00400010, 0x20004010, 0x00004000,
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180 | 0x00404000, 0x20004010, 0x00000010, 0x20400010,
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181 | 0x20400010, 0x00000000, 0x00404010, 0x20404000,
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182 | 0x00004010, 0x00404000, 0x20404000, 0x20000000,
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183 | 0x20004000, 0x00000010, 0x20400010, 0x00404000,
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184 | 0x20404010, 0x00400000, 0x00004010, 0x20000010,
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185 | 0x00400000, 0x20004000, 0x20000000, 0x00004010,
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186 | 0x20000010, 0x20404010, 0x00404000, 0x20400000,
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187 | 0x00404010, 0x20404000, 0x00000000, 0x20400010,
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188 | 0x00000010, 0x00004000, 0x20400000, 0x00404010,
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189 | 0x00004000, 0x00400010, 0x20004010, 0x00000000,
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190 | 0x20404000, 0x20000000, 0x00400010, 0x20004010
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191 | };
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192 |
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193 | static const unsigned long SB7[64] =
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194 | {
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195 | 0x00200000, 0x04200002, 0x04000802, 0x00000000,
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196 | 0x00000800, 0x04000802, 0x00200802, 0x04200800,
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197 | 0x04200802, 0x00200000, 0x00000000, 0x04000002,
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198 | 0x00000002, 0x04000000, 0x04200002, 0x00000802,
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199 | 0x04000800, 0x00200802, 0x00200002, 0x04000800,
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200 | 0x04000002, 0x04200000, 0x04200800, 0x00200002,
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201 | 0x04200000, 0x00000800, 0x00000802, 0x04200802,
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202 | 0x00200800, 0x00000002, 0x04000000, 0x00200800,
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203 | 0x04000000, 0x00200800, 0x00200000, 0x04000802,
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204 | 0x04000802, 0x04200002, 0x04200002, 0x00000002,
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205 | 0x00200002, 0x04000000, 0x04000800, 0x00200000,
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206 | 0x04200800, 0x00000802, 0x00200802, 0x04200800,
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207 | 0x00000802, 0x04000002, 0x04200802, 0x04200000,
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208 | 0x00200800, 0x00000000, 0x00000002, 0x04200802,
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209 | 0x00000000, 0x00200802, 0x04200000, 0x00000800,
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210 | 0x04000002, 0x04000800, 0x00000800, 0x00200002
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211 | };
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212 |
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213 | static const unsigned long SB8[64] =
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214 | {
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215 | 0x10001040, 0x00001000, 0x00040000, 0x10041040,
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216 | 0x10000000, 0x10001040, 0x00000040, 0x10000000,
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217 | 0x00040040, 0x10040000, 0x10041040, 0x00041000,
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218 | 0x10041000, 0x00041040, 0x00001000, 0x00000040,
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219 | 0x10040000, 0x10000040, 0x10001000, 0x00001040,
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220 | 0x00041000, 0x00040040, 0x10040040, 0x10041000,
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221 | 0x00001040, 0x00000000, 0x00000000, 0x10040040,
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222 | 0x10000040, 0x10001000, 0x00041040, 0x00040000,
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223 | 0x00041040, 0x00040000, 0x10041000, 0x00001000,
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224 | 0x00000040, 0x10040040, 0x00001000, 0x00041040,
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225 | 0x10001000, 0x00000040, 0x10000040, 0x10040000,
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226 | 0x10040040, 0x10000000, 0x00040000, 0x10001040,
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227 | 0x00000000, 0x10041040, 0x00040040, 0x10000040,
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228 | 0x10040000, 0x10001000, 0x10001040, 0x00000000,
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229 | 0x10041040, 0x00041000, 0x00041000, 0x00001040,
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230 | 0x00001040, 0x00040040, 0x10000000, 0x10041000
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231 | };
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232 |
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233 | /*
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234 | * PC1: left and right halves bit-swap
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235 | */
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236 | static const unsigned long LHs[16] =
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237 | {
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238 | 0x00000000, 0x00000001, 0x00000100, 0x00000101,
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239 | 0x00010000, 0x00010001, 0x00010100, 0x00010101,
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240 | 0x01000000, 0x01000001, 0x01000100, 0x01000101,
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241 | 0x01010000, 0x01010001, 0x01010100, 0x01010101
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242 | };
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243 |
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244 | static const unsigned long RHs[16] =
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245 | {
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246 | 0x00000000, 0x01000000, 0x00010000, 0x01010000,
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247 | 0x00000100, 0x01000100, 0x00010100, 0x01010100,
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248 | 0x00000001, 0x01000001, 0x00010001, 0x01010001,
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249 | 0x00000101, 0x01000101, 0x00010101, 0x01010101,
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250 | };
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251 |
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252 | /*
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253 | * Initial Permutation macro
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254 | */
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255 | #define DES_IP(X,Y) \
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256 | { \
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257 | T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \
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258 | T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \
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259 | T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \
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260 | T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \
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261 | Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF; \
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262 | T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T; \
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263 | X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF; \
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264 | }
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265 |
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266 | /*
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267 | * Final Permutation macro
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268 | */
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269 | #define DES_FP(X,Y) \
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270 | { \
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271 | X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF; \
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272 | T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T; \
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273 | Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF; \
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274 | T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \
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275 | T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \
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276 | T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \
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277 | T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \
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278 | }
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279 |
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280 | /*
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281 | * DES round macro
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282 | */
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283 | #define DES_ROUND(X,Y) \
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284 | { \
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285 | T = *SK++ ^ X; \
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286 | Y ^= SB8[ (T ) & 0x3F ] ^ \
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287 | SB6[ (T >> 8) & 0x3F ] ^ \
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288 | SB4[ (T >> 16) & 0x3F ] ^ \
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289 | SB2[ (T >> 24) & 0x3F ]; \
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290 | \
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291 | T = *SK++ ^ ((X << 28) | (X >> 4)); \
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292 | Y ^= SB7[ (T ) & 0x3F ] ^ \
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293 | SB5[ (T >> 8) & 0x3F ] ^ \
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294 | SB3[ (T >> 16) & 0x3F ] ^ \
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295 | SB1[ (T >> 24) & 0x3F ]; \
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296 | }
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297 |
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298 | #define SWAP(a,b) { unsigned long t = a; a = b; b = t; t = 0; }
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299 |
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300 | static void des_setkey( unsigned long SK[32], unsigned char key[8] )
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301 | {
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302 | int i;
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303 | unsigned long X, Y, T;
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304 |
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305 | GET_ULONG_BE( X, key, 0 );
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306 | GET_ULONG_BE( Y, key, 4 );
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307 |
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308 | /*
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309 | * Permuted Choice 1
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310 | */
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311 | T = ((Y >> 4) ^ X) & 0x0F0F0F0F; X ^= T; Y ^= (T << 4);
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312 | T = ((Y ) ^ X) & 0x10101010; X ^= T; Y ^= (T );
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313 |
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314 | X = (LHs[ (X ) & 0xF] << 3) | (LHs[ (X >> 8) & 0xF ] << 2)
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315 | | (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ] )
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316 | | (LHs[ (X >> 5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6)
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317 | | (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4);
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318 |
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319 | Y = (RHs[ (Y >> 1) & 0xF] << 3) | (RHs[ (Y >> 9) & 0xF ] << 2)
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320 | | (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ] )
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321 | | (RHs[ (Y >> 4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6)
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322 | | (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4);
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323 |
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324 | X &= 0x0FFFFFFF;
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325 | Y &= 0x0FFFFFFF;
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326 |
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327 | /*
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328 | * calculate subkeys
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329 | */
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330 | for( i = 0; i < 16; i++ )
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331 | {
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332 | if( i < 2 || i == 8 || i == 15 )
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333 | {
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334 | X = ((X << 1) | (X >> 27)) & 0x0FFFFFFF;
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335 | Y = ((Y << 1) | (Y >> 27)) & 0x0FFFFFFF;
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336 | }
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337 | else
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338 | {
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339 | X = ((X << 2) | (X >> 26)) & 0x0FFFFFFF;
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340 | Y = ((Y << 2) | (Y >> 26)) & 0x0FFFFFFF;
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341 | }
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342 |
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343 | *SK++ = ((X << 4) & 0x24000000) | ((X << 28) & 0x10000000)
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344 | | ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000)
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345 | | ((X << 6) & 0x01000000) | ((X << 9) & 0x00200000)
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346 | | ((X >> 1) & 0x00100000) | ((X << 10) & 0x00040000)
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347 | | ((X << 2) & 0x00020000) | ((X >> 10) & 0x00010000)
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348 | | ((Y >> 13) & 0x00002000) | ((Y >> 4) & 0x00001000)
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349 | | ((Y << 6) & 0x00000800) | ((Y >> 1) & 0x00000400)
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350 | | ((Y >> 14) & 0x00000200) | ((Y ) & 0x00000100)
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351 | | ((Y >> 5) & 0x00000020) | ((Y >> 10) & 0x00000010)
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352 | | ((Y >> 3) & 0x00000008) | ((Y >> 18) & 0x00000004)
|
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353 | | ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001);
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354 |
|
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355 | *SK++ = ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000)
|
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356 | | ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000)
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357 | | ((X >> 2) & 0x02000000) | ((X << 1) & 0x01000000)
|
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358 | | ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000)
|
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359 | | ((X << 3) & 0x00080000) | ((X >> 6) & 0x00040000)
|
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360 | | ((X << 15) & 0x00020000) | ((X >> 4) & 0x00010000)
|
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361 | | ((Y >> 2) & 0x00002000) | ((Y << 8) & 0x00001000)
|
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362 | | ((Y >> 14) & 0x00000808) | ((Y >> 9) & 0x00000400)
|
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363 | | ((Y ) & 0x00000200) | ((Y << 7) & 0x00000100)
|
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364 | | ((Y >> 7) & 0x00000020) | ((Y >> 3) & 0x00000011)
|
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365 | | ((Y << 2) & 0x00000004) | ((Y >> 21) & 0x00000002);
|
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366 | }
|
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367 | }
|
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368 |
|
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369 | /*
|
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370 | * DES key schedule (56-bit, encryption)
|
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371 | */
|
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372 | void des_setkey_enc( des_context *ctx, unsigned char key[8] )
|
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373 | {
|
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374 | des_setkey( ctx->sk, key );
|
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375 | }
|
---|
376 |
|
---|
377 | /*
|
---|
378 | * DES key schedule (56-bit, decryption)
|
---|
379 | */
|
---|
380 | void des_setkey_dec( des_context *ctx, unsigned char key[8] )
|
---|
381 | {
|
---|
382 | int i;
|
---|
383 |
|
---|
384 | des_setkey( ctx->sk, key );
|
---|
385 |
|
---|
386 | for( i = 0; i < 16; i += 2 )
|
---|
387 | {
|
---|
388 | SWAP( ctx->sk[i ], ctx->sk[30 - i] );
|
---|
389 | SWAP( ctx->sk[i + 1], ctx->sk[31 - i] );
|
---|
390 | }
|
---|
391 | }
|
---|
392 |
|
---|
393 | /*
|
---|
394 | * DES-ECB block encryption/decryption
|
---|
395 | */
|
---|
396 | void des_crypt_ecb( des_context *ctx,
|
---|
397 | const unsigned char input[8],
|
---|
398 | unsigned char output[8] )
|
---|
399 | {
|
---|
400 | int i;
|
---|
401 | unsigned long X, Y, T, *SK;
|
---|
402 |
|
---|
403 | SK = ctx->sk;
|
---|
404 |
|
---|
405 | GET_ULONG_BE( X, input, 0 );
|
---|
406 | GET_ULONG_BE( Y, input, 4 );
|
---|
407 |
|
---|
408 | DES_IP( X, Y );
|
---|
409 |
|
---|
410 | for( i = 0; i < 8; i++ )
|
---|
411 | {
|
---|
412 | DES_ROUND( Y, X );
|
---|
413 | DES_ROUND( X, Y );
|
---|
414 | }
|
---|
415 |
|
---|
416 | DES_FP( Y, X );
|
---|
417 |
|
---|
418 | PUT_ULONG_BE( Y, output, 0 );
|
---|
419 | PUT_ULONG_BE( X, output, 4 );
|
---|
420 | }
|
---|
421 |
|
---|
422 | #endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES */
|
---|