1 | /* |
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2 | * Copyright (c) 2002, 2003 Bob Deblier |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or |
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5 | * modify it under the terms of the GNU Lesser General Public |
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6 | * License as published by the Free Software Foundation; either |
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7 | * version 2.1 of the License, or (at your option) any later version. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * Lesser General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Lesser General Public |
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15 | * License along with this library; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 | * |
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18 | */ |
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19 | |
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20 | /*!\file aes.c |
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21 | * \brief AES block cipher, as specified by NIST FIPS 197. |
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22 | * |
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23 | * The table lookup method was inspired by Brian Gladman's AES implementation, |
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24 | * which is much more readable than the standard code. |
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25 | * |
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26 | * \author Bob Deblier <bob.deblier@pandora.be> |
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27 | * \ingroup BC_aes_m BC_m |
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28 | */ |
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29 | |
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30 | /* Modified from beecrypt by alexander larsson <alexl@redhat.com> */ |
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31 | |
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32 | #include "config.h" |
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33 | |
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34 | #include "aes.h" |
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35 | |
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36 | #if defined(G_BYTE_ORDER) && defined(G_BIG_ENDIAN) && defined(G_LITTLE_ENDIAN) |
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37 | # if (G_BYTE_ORDER != G_BIG_ENDIAN) && (G_BYTE_ORDER != G_LITTLE_ENDIAN) |
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38 | # error unsupported endian-ness. |
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39 | # endif |
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40 | #endif |
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41 | |
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42 | #if WORDS_BIGENDIAN |
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43 | # include "aes_be.h" |
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44 | #else |
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45 | # include "aes_le.h" |
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46 | #endif |
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47 | |
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48 | int aesSetup(aesParam* ap, const byte* key, size_t keybits, cipherOperation op) |
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49 | { |
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50 | if ((op != ENCRYPT) && (op != DECRYPT)) |
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51 | return -1; |
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52 | |
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53 | if (((keybits & 63) == 0) && (keybits >= 128) && (keybits <= 256)) |
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54 | { |
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55 | register guint32* rk, t, i, j; |
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56 | |
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57 | /* clear fdback/iv */ |
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58 | ap->fdback[0] = 0; |
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59 | ap->fdback[1] = 0; |
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60 | ap->fdback[2] = 0; |
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61 | ap->fdback[3] = 0; |
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62 | |
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63 | ap->nr = 6 + (keybits >> 5); |
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64 | |
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65 | rk = ap->k; |
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66 | |
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67 | memcpy(rk, key, keybits >> 3); |
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68 | |
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69 | i = 0; |
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70 | |
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71 | if (keybits == 128) |
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72 | { |
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73 | while (1) |
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74 | { |
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75 | t = rk[3]; |
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76 | #if WORDS_BIGENDIAN |
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77 | t = (_ae4[(t >> 16) & 0xff] & 0xff000000) ^ |
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78 | (_ae4[(t >> 8) & 0xff] & 0x00ff0000) ^ |
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79 | (_ae4[(t ) & 0xff] & 0x0000ff00) ^ |
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80 | (_ae4[(t >> 24) ] & 0x000000ff) ^ |
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81 | _arc[i]; |
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82 | #else |
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83 | t = (_ae4[(t >> 8) & 0xff] & 0x000000ff) ^ |
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84 | (_ae4[(t >> 16) & 0xff] & 0x0000ff00) ^ |
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85 | (_ae4[(t >> 24) ] & 0x00ff0000) ^ |
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86 | (_ae4[(t ) & 0xff] & 0xff000000) ^ |
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87 | _arc[i]; |
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88 | #endif |
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89 | rk[4] = (t ^= rk[0]); |
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90 | rk[5] = (t ^= rk[1]); |
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91 | rk[6] = (t ^= rk[2]); |
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92 | rk[7] = (t ^= rk[3]); |
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93 | if (++i == 10) |
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94 | break; |
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95 | rk += 4; |
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96 | } |
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97 | } |
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98 | else if (keybits == 192) |
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99 | { |
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100 | while (1) |
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101 | { |
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102 | t = rk[5]; |
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103 | #if WORDS_BIGENDIAN |
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104 | t = (_ae4[(t >> 16) & 0xff] & 0xff000000) ^ |
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105 | (_ae4[(t >> 8) & 0xff] & 0x00ff0000) ^ |
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106 | (_ae4[(t ) & 0xff] & 0x0000ff00) ^ |
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107 | (_ae4[(t >> 24) ] & 0x000000ff) ^ |
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108 | _arc[i]; |
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109 | #else |
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110 | t = (_ae4[(t >> 8) & 0xff] & 0x000000ff) ^ |
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111 | (_ae4[(t >> 16) & 0xff] & 0x0000ff00) ^ |
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112 | (_ae4[(t >> 24) ] & 0x00ff0000) ^ |
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113 | (_ae4[(t ) & 0xff] & 0xff000000) ^ |
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114 | _arc[i]; |
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115 | #endif |
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116 | rk[6] = (t ^= rk[0]); |
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117 | rk[7] = (t ^= rk[1]); |
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118 | rk[8] = (t ^= rk[2]); |
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119 | rk[9] = (t ^= rk[3]); |
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120 | if (++i == 8) |
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121 | break; |
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122 | rk[10] = (t ^= rk[4]); |
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123 | rk[11] = (t ^= rk[5]); |
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124 | rk += 6; |
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125 | } |
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126 | } |
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127 | else if (keybits == 256) |
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128 | { |
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129 | while (1) |
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130 | { |
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131 | t = rk[7]; |
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132 | #if WORDS_BIGENDIAN |
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133 | t = (_ae4[(t >> 16) & 0xff] & 0xff000000) ^ |
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134 | (_ae4[(t >> 8) & 0xff] & 0x00ff0000) ^ |
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135 | (_ae4[(t ) & 0xff] & 0x0000ff00) ^ |
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136 | (_ae4[(t >> 24) ] & 0x000000ff) ^ |
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137 | _arc[i]; |
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138 | #else |
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139 | t = (_ae4[(t >> 8) & 0xff] & 0x000000ff) ^ |
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140 | (_ae4[(t >> 16) & 0xff] & 0x0000ff00) ^ |
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141 | (_ae4[(t >> 24) ] & 0x00ff0000) ^ |
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142 | (_ae4[(t ) & 0xff] & 0xff000000) ^ |
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143 | _arc[i]; |
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144 | #endif |
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145 | rk[8] = (t ^= rk[0]); |
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146 | rk[9] = (t ^= rk[1]); |
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147 | rk[10] = (t ^= rk[2]); |
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148 | rk[11] = (t ^= rk[3]); |
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149 | if (++i == 7) |
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150 | break; |
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151 | #if WORDS_BIGENDIAN |
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152 | t = (_ae4[(t >> 24) ] & 0xff000000) ^ |
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153 | (_ae4[(t >> 16) & 0xff] & 0x00ff0000) ^ |
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154 | (_ae4[(t >> 8) & 0xff] & 0x0000ff00) ^ |
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155 | (_ae4[(t ) & 0xff] & 0x000000ff); |
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156 | #else |
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157 | t = (_ae4[(t ) & 0xff] & 0x000000ff) ^ |
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158 | (_ae4[(t >> 8) & 0xff] & 0x0000ff00) ^ |
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159 | (_ae4[(t >> 16) & 0xff] & 0x00ff0000) ^ |
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160 | (_ae4[(t >> 24) ] & 0xff000000); |
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161 | #endif |
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162 | rk[12] = (t ^= rk[4]); |
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163 | rk[13] = (t ^= rk[5]); |
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164 | rk[14] = (t ^= rk[6]); |
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165 | rk[15] = (t ^= rk[7]); |
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166 | rk += 8; |
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167 | } |
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168 | } |
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169 | |
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170 | if (op == DECRYPT) |
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171 | { |
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172 | rk = ap->k; |
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173 | |
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174 | for (i = 0, j = (ap->nr << 2); i < j; i += 4, j -= 4) |
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175 | { |
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176 | t = rk[i ]; rk[i ] = rk[j ]; rk[j ] = t; |
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177 | t = rk[i+1]; rk[i+1] = rk[j+1]; rk[j+1] = t; |
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178 | t = rk[i+2]; rk[i+2] = rk[j+2]; rk[j+2] = t; |
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179 | t = rk[i+3]; rk[i+3] = rk[j+3]; rk[j+3] = t; |
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180 | } |
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181 | for (i = 1; i < ap->nr; i++) |
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182 | { |
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183 | rk += 4; |
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184 | #if WORDS_BIGENDIAN |
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185 | rk[0] = |
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186 | _ad0[_ae4[(rk[0] >> 24) ] & 0xff] ^ |
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187 | _ad1[_ae4[(rk[0] >> 16) & 0xff] & 0xff] ^ |
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188 | _ad2[_ae4[(rk[0] >> 8) & 0xff] & 0xff] ^ |
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189 | _ad3[_ae4[(rk[0] ) & 0xff] & 0xff]; |
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190 | rk[1] = |
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191 | _ad0[_ae4[(rk[1] >> 24) ] & 0xff] ^ |
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192 | _ad1[_ae4[(rk[1] >> 16) & 0xff] & 0xff] ^ |
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193 | _ad2[_ae4[(rk[1] >> 8) & 0xff] & 0xff] ^ |
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194 | _ad3[_ae4[(rk[1] ) & 0xff] & 0xff]; |
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195 | rk[2] = |
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196 | _ad0[_ae4[(rk[2] >> 24) ] & 0xff] ^ |
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197 | _ad1[_ae4[(rk[2] >> 16) & 0xff] & 0xff] ^ |
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198 | _ad2[_ae4[(rk[2] >> 8) & 0xff] & 0xff] ^ |
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199 | _ad3[_ae4[(rk[2] ) & 0xff] & 0xff]; |
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200 | rk[3] = |
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201 | _ad0[_ae4[(rk[3] >> 24) ] & 0xff] ^ |
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202 | _ad1[_ae4[(rk[3] >> 16) & 0xff] & 0xff] ^ |
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203 | _ad2[_ae4[(rk[3] >> 8) & 0xff] & 0xff] ^ |
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204 | _ad3[_ae4[(rk[3] ) & 0xff] & 0xff]; |
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205 | #else |
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206 | rk[0] = |
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207 | _ad0[_ae4[(rk[0] ) & 0xff] & 0xff] ^ |
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208 | _ad1[_ae4[(rk[0] >> 8) & 0xff] & 0xff] ^ |
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209 | _ad2[_ae4[(rk[0] >> 16) & 0xff] & 0xff] ^ |
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210 | _ad3[_ae4[(rk[0] >> 24) ] & 0xff]; |
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211 | rk[1] = |
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212 | _ad0[_ae4[(rk[1] ) & 0xff] & 0xff] ^ |
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213 | _ad1[_ae4[(rk[1] >> 8) & 0xff] & 0xff] ^ |
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214 | _ad2[_ae4[(rk[1] >> 16) & 0xff] & 0xff] ^ |
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215 | _ad3[_ae4[(rk[1] >> 24) ] & 0xff]; |
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216 | rk[2] = |
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217 | _ad0[_ae4[(rk[2] ) & 0xff] & 0xff] ^ |
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218 | _ad1[_ae4[(rk[2] >> 8) & 0xff] & 0xff] ^ |
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219 | _ad2[_ae4[(rk[2] >> 16) & 0xff] & 0xff] ^ |
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220 | _ad3[_ae4[(rk[2] >> 24) ] & 0xff]; |
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221 | rk[3] = |
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222 | _ad0[_ae4[(rk[3] ) & 0xff] & 0xff] ^ |
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223 | _ad1[_ae4[(rk[3] >> 8) & 0xff] & 0xff] ^ |
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224 | _ad2[_ae4[(rk[3] >> 16) & 0xff] & 0xff] ^ |
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225 | _ad3[_ae4[(rk[3] >> 24) ] & 0xff]; |
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226 | #endif |
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227 | } |
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228 | } |
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229 | return 0; |
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230 | } |
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231 | return -1; |
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232 | } |
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233 | |
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234 | int aesSetIV(aesParam* ap, const byte* iv) |
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235 | { |
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236 | if (iv) |
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237 | memcpy(ap->fdback, iv, 16); |
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238 | else |
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239 | memset(ap->fdback, 0, 16); |
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240 | |
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241 | return 0; |
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242 | } |
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243 | |
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244 | int aesEncrypt(aesParam* ap, guint32* dst, const guint32* src) |
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245 | { |
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246 | register guint32 s0, s1, s2, s3; |
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247 | register guint32 t0, t1, t2, t3; |
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248 | register guint32* rk = ap->k; |
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249 | |
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250 | s0 = src[0] ^ rk[0]; |
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251 | s1 = src[1] ^ rk[1]; |
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252 | s2 = src[2] ^ rk[2]; |
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253 | s3 = src[3] ^ rk[3]; |
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254 | |
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255 | etfs(4); /* round 1 */ |
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256 | esft(8); /* round 2 */ |
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257 | etfs(12); /* round 3 */ |
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258 | esft(16); /* round 4 */ |
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259 | etfs(20); /* round 5 */ |
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260 | esft(24); /* round 6 */ |
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261 | etfs(28); /* round 7 */ |
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262 | esft(32); /* round 8 */ |
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263 | etfs(36); /* round 9 */ |
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264 | |
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265 | if (ap->nr > 10) |
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266 | { |
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267 | esft(40); /* round 10 */ |
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268 | etfs(44); /* round 11 */ |
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269 | if (ap->nr > 12) |
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270 | { |
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271 | esft(48); /* round 12 */ |
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272 | etfs(52); /* round 13 */ |
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273 | } |
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274 | } |
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275 | |
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276 | rk += (ap->nr << 2); |
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277 | |
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278 | elr(); /* last round */ |
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279 | |
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280 | dst[0] = s0; |
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281 | dst[1] = s1; |
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282 | dst[2] = s2; |
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283 | dst[3] = s3; |
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284 | |
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285 | return 0; |
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286 | } |
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287 | |
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288 | int aesDecrypt(aesParam* ap, guint32* dst, const guint32* src) |
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289 | { |
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290 | register guint32 s0, s1, s2, s3; |
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291 | register guint32 t0, t1, t2, t3; |
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292 | register guint32* rk = ap->k; |
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293 | |
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294 | s0 = src[0] ^ rk[0]; |
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295 | s1 = src[1] ^ rk[1]; |
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296 | s2 = src[2] ^ rk[2]; |
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297 | s3 = src[3] ^ rk[3]; |
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298 | |
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299 | dtfs(4); /* round 1 */ |
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300 | dsft(8); /* round 2 */ |
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301 | dtfs(12); /* round 3 */ |
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302 | dsft(16); /* round 4 */ |
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303 | dtfs(20); /* round 5 */ |
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304 | dsft(24); /* round 6 */ |
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305 | dtfs(28); /* round 7 */ |
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306 | dsft(32); /* round 8 */ |
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307 | dtfs(36); /* round 9 */ |
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308 | |
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309 | if (ap->nr > 10) |
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310 | { |
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311 | dsft(40); /* round 10 */ |
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312 | dtfs(44); /* round 11 */ |
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313 | if (ap->nr > 12) |
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314 | { |
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315 | dsft(48); /* round 12 */ |
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316 | dtfs(52); /* round 13 */ |
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317 | } |
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318 | } |
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319 | |
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320 | rk += (ap->nr << 2); |
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321 | |
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322 | dlr(); /* last round */ |
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323 | |
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324 | dst[0] = s0; |
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325 | dst[1] = s1; |
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326 | dst[2] = s2; |
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327 | dst[3] = s3; |
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328 | |
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329 | return 0; |
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330 | } |
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331 | |
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332 | guint32* aesFeedback(aesParam* ap) |
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333 | { |
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334 | return ap->fdback; |
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335 | } |
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