annotate aes.c @ 16:8b1aeff120e9

add max/min sanity checks
author Matt Johnston <matt@ucc.asn.au>
date Thu, 13 Jun 2013 00:22:37 +0800
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1 #include "aes.h"
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2 //#include "loader.h"
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3 //
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4 #define KEY_COUNT 1
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5
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6 #if KEY_COUNT > 0
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8 //#include "aeskeys.inc"
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13 typedef unsigned char byte;
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17 #define BPOLY 0x1b //!< Lower 8 bits of (x^8+x^4+x^3+x+1), ie. (x^4+x^3+x+1).
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18 #define BLOCKSIZE 16 //!< Block size in number of bytes.
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22 #if KEY_COUNT == 1
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23 #define KEYBITS 128 //!< Use AES128.
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24 #elif KEY_COUNT == 2
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25 #define KEYBITS 192 //!< Use AES196.
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26 #elif KEY_COUNT == 3
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27 #define KEYBITS 256 //!< Use AES256.
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28 #else
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29 #error Use 1, 2 or 3 keys!
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30 #endif
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32 #if KEYBITS == 128
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33 #define ROUNDS 10 //!< Number of rounds.
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34 #define KEYLENGTH 16 //!< Key length in number of bytes.
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35 #elif KEYBITS == 192
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36 #define ROUNDS 12 //!< Number of rounds.
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37 #define KEYLENGTH 24 //!< // Key length in number of bytes.
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38 #elif KEYBITS == 256
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39 #define ROUNDS 14 //!< Number of rounds.
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40 #define KEYLENGTH 32 //!< Key length in number of bytes.
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41 #else
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42 #error Key must be 128, 192 or 256 bits!
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43 #endif
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45 #define EXPANDED_KEY_SIZE (BLOCKSIZE * (ROUNDS+1)) //!< 176, 208 or 240 bytes.
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48
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49 byte block1[ 256 ]; //!< Workspace 1.
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50 byte block2[ 256 ]; //!< Worksapce 2.
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53
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54 byte * powTbl; //!< Final location of exponentiation lookup table.
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55 byte * logTbl; //!< Final location of logarithm lookup table.
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56 byte * sBox; //!< Final location of s-box.
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57 byte * sBoxInv; //!< Final location of inverse s-box.
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58 byte * expandedKey; //!< Final location of expanded key.
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61
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62 void CalcPowLog( byte * powTbl, byte * logTbl )
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63 {
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64 byte i = 0;
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65 byte t = 1;
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67 do {
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68 // Use 0x03 as root for exponentiation and logarithms.
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69 powTbl[i] = t;
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70 logTbl[t] = i;
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71 i++;
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72
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73 // Muliply t by 3 in GF(2^8).
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74 t ^= (t << 1) ^ (t & 0x80 ? BPOLY : 0);
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75 } while( t != 1 ); // Cyclic properties ensure that i < 255.
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77 powTbl[255] = powTbl[0]; // 255 = '-0', 254 = -1, etc.
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78 }
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81
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82 void CalcSBox( byte * sBox )
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83 {
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84 byte i, rot;
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85 byte temp;
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86 byte result;
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87
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88 // Fill all entries of sBox[].
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89 i = 0;
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90 do {
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91 // Inverse in GF(2^8).
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92 if( i > 0 ) {
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93 temp = powTbl[ 255 - logTbl[i] ];
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94 } else {
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95 temp = 0;
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96 }
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97
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98 // Affine transformation in GF(2).
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99 result = temp ^ 0x63; // Start with adding a vector in GF(2).
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100 for( rot = 0; rot < 4; rot++ ) {
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101 // Rotate left.
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102 temp = (temp<<1) | (temp>>7);
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103
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104 // Add rotated byte in GF(2).
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105 result ^= temp;
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106 }
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107
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108 // Put result in table.
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109 sBox[i] = result;
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110 } while( ++i != 0 );
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111 }
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112
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113
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114
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115 void CalcSBoxInv( byte * sBox, byte * sBoxInv )
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116 {
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117 byte i = 0;
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118 byte j = 0;
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120 // Iterate through all elements in sBoxInv using i.
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121 do {
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122 // Search through sBox using j.
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123 do {
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124 // Check if current j is the inverse of current i.
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125 if( sBox[ j ] == i ) {
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126 // If so, set sBoxInc and indicate search finished.
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127 sBoxInv[ i ] = j;
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128 j = 255;
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129 }
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130 } while( ++j != 0 );
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131 } while( ++i != 0 );
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132 }
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133
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134
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135
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136 void CycleLeft( byte * row )
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137 {
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138 // Cycle 4 bytes in an array left once.
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139 byte temp = row[0];
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140 row[0] = row[1];
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141 row[1] = row[2];
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142 row[2] = row[3];
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143 row[3] = temp;
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144 }
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145
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148 void InvMixColumn( byte * column )
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149 {
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diff changeset
150 byte result0, result1, result2, result3;
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diff changeset
151 byte column0, column1, column2, column3;
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152 byte xor;
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153
10
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154 // This generates more effective code, at least
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155 // with the IAR C compiler.
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diff changeset
156 column0 = column[0];
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diff changeset
157 column1 = column[1];
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158 column2 = column[2];
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159 column3 = column[3];
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160
10
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161 // Partial sums (modular addition using XOR).
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162 result0 = column1 ^ column2 ^ column3;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
163 result1 = column0 ^ column2 ^ column3;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
164 result2 = column0 ^ column1 ^ column3;
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165 result3 = column0 ^ column1 ^ column2;
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166
10
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167 // Multiply column bytes by 2 modulo BPOLY.
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168 // This operation is done the following way to ensure cycle count
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169 // independent from data contents. Take care when changing this code.
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170 xor = 0;
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171 if (column0 & 0x80) {
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172 xor = BPOLY;
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173 }
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174 column0 <<= 1;
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175 column0 ^= xor;
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diff changeset
176
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177 xor = 0;
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178 if (column1 & 0x80) {
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179 xor = BPOLY;
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180 }
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181 column1 <<= 1;
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182 column1 ^= xor;
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183
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184 xor = 0;
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185 if (column2 & 0x80) {
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186 xor = BPOLY;
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187 }
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188 column2 <<= 1;
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189 column2 ^= xor;
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190
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191 xor = 0;
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Matt Johnston <matt@ucc.asn.au>
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192 if (column3 & 0x80) {
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193 xor = BPOLY;
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194 }
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195 column3 <<= 1;
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196 column3 ^= xor;
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197
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198 // More partial sums.
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199 result0 ^= column0 ^ column1;
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Matt Johnston <matt@ucc.asn.au>
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200 result1 ^= column1 ^ column2;
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201 result2 ^= column2 ^ column3;
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202 result3 ^= column0 ^ column3;
3
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203
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204 // Multiply column bytes by 2 modulo BPOLY.
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205 // This operation is done the following way to ensure cycle count
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206 // independent from data contents. Take care when changing this code.
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207 xor = 0;
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208 if (column0 & 0x80) {
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209 xor = BPOLY;
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210 }
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211 column0 <<= 1;
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212 column0 ^= xor;
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diff changeset
213
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214 xor = 0;
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215 if (column1 & 0x80) {
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216 xor = BPOLY;
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217 }
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218 column1 <<= 1;
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219 column1 ^= xor;
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parents: 5
diff changeset
220
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221 xor = 0;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
222 if (column2 & 0x80) {
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diff changeset
223 xor = BPOLY;
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diff changeset
224 }
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225 column2 <<= 1;
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226 column2 ^= xor;
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227
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228 xor = 0;
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diff changeset
229 if (column3 & 0x80) {
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diff changeset
230 xor = BPOLY;
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parents: 5
diff changeset
231 }
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232 column3 <<= 1;
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233 column3 ^= xor;
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234
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235 // More partial sums.
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236 result0 ^= column0 ^ column2;
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Matt Johnston <matt@ucc.asn.au>
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237 result1 ^= column1 ^ column3;
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238 result2 ^= column0 ^ column2;
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239 result3 ^= column1 ^ column3;
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240
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241 // Multiply column bytes by 2 modulo BPOLY.
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242 // This operation is done the following way to ensure cycle count
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243 // independent from data contents. Take care when changing this code.
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244 xor = 0;
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diff changeset
245 if (column0 & 0x80) {
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246 xor = BPOLY;
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247 }
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248 column0 <<= 1;
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249 column0 ^= xor;
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parents: 5
diff changeset
250
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251 xor = 0;
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diff changeset
252 if (column1 & 0x80) {
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253 xor = BPOLY;
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254 }
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255 column1 <<= 1;
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parents: 5
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256 column1 ^= xor;
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parents: 5
diff changeset
257
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258 xor = 0;
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diff changeset
259 if (column2 & 0x80) {
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parents: 5
diff changeset
260 xor = BPOLY;
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parents: 5
diff changeset
261 }
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diff changeset
262 column2 <<= 1;
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263 column2 ^= xor;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
264
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parents: 5
diff changeset
265 xor = 0;
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diff changeset
266 if (column3 & 0x80) {
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diff changeset
267 xor = BPOLY;
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diff changeset
268 }
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269 column3 <<= 1;
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270 column3 ^= xor;
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271
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272 // Final partial sum.
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273 column0 ^= column1 ^ column2 ^ column3;
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diff changeset
274
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275 // Final sums stored into original column bytes.
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276 column[0] = result0 ^ column0;
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diff changeset
277 column[1] = result1 ^ column0;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
278 column[2] = result2 ^ column0;
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279 column[3] = result3 ^ column0;
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diff changeset
280 }
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
281
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parents: 5
diff changeset
282
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parents:
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283
10
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diff changeset
284 void SubBytes( byte * bytes, byte count )
3
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parents:
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285 {
10
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diff changeset
286 do {
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parents: 5
diff changeset
287 *bytes = sBox[ *bytes ]; // Substitute every byte in state.
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parents: 5
diff changeset
288 bytes++;
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parents: 5
diff changeset
289 } while( --count );
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290 }
3
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parents:
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291
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293
10
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parents: 5
diff changeset
294 void InvSubBytesAndXOR( byte * bytes, byte * key, byte count )
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diff changeset
295 {
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parents: 5
diff changeset
296 do {
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parents: 5
diff changeset
297 // *bytes = sBoxInv[ *bytes ] ^ *key; // Inverse substitute every byte in state and add key.
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parents: 5
diff changeset
298 *bytes = block2[ *bytes ] ^ *key; // Use block2 directly. Increases speed.
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parents: 5
diff changeset
299 bytes++;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
300 key++;
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parents: 5
diff changeset
301 } while( --count );
3
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parents:
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302 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
diff changeset
303
10
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parents: 5
diff changeset
304
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parents: 5
diff changeset
305
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
306 void InvShiftRows( byte * state )
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307 {
10
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parents: 5
diff changeset
308 byte temp;
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parents: 5
diff changeset
309
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diff changeset
310 // Note: State is arranged column by column.
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
diff changeset
311
10
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diff changeset
312 // Cycle second row right one time.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
313 temp = state[ 1 + 3*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
314 state[ 1 + 3*4 ] = state[ 1 + 2*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
315 state[ 1 + 2*4 ] = state[ 1 + 1*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
316 state[ 1 + 1*4 ] = state[ 1 + 0*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
317 state[ 1 + 0*4 ] = temp;
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
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318
10
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diff changeset
319 // Cycle third row right two times.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
320 temp = state[ 2 + 0*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
321 state[ 2 + 0*4 ] = state[ 2 + 2*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
322 state[ 2 + 2*4 ] = temp;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
323 temp = state[ 2 + 1*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
324 state[ 2 + 1*4 ] = state[ 2 + 3*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
325 state[ 2 + 3*4 ] = temp;
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
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326
10
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diff changeset
327 // Cycle fourth row right three times, ie. left once.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
328 temp = state[ 3 + 0*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
329 state[ 3 + 0*4 ] = state[ 3 + 1*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
330 state[ 3 + 1*4 ] = state[ 3 + 2*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
331 state[ 3 + 2*4 ] = state[ 3 + 3*4 ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
332 state[ 3 + 3*4 ] = temp;
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
diff changeset
333 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
334
10
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parents: 5
diff changeset
335
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336
10
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
337 void InvMixColumns( byte * state )
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
338 {
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
339 InvMixColumn( state + 0*4 );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
340 InvMixColumn( state + 1*4 );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
341 InvMixColumn( state + 2*4 );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
342 InvMixColumn( state + 3*4 );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
343 }
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
344
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
345
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
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346
10
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parents: 5
diff changeset
347 void XORBytes( byte * bytes1, byte * bytes2, byte count )
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
348 {
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
349 do {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
350 *bytes1 ^= *bytes2; // Add in GF(2), ie. XOR.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
351 bytes1++;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
352 bytes2++;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
353 } while( --count );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
354 }
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
356
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
358 void CopyBytes( byte * to, byte * from, byte count )
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
359 {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
360 do {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
361 *to = *from;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
362 to++;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
363 from++;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
364 } while( --count );
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
367
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
368
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
369 void KeyExpansion( byte * key, byte * expandedKey )
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 {
10
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parents: 5
diff changeset
371 byte temp[4];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
372 byte i;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
373 byte Rcon[4] = { 0x01, 0x00, 0x00, 0x00 }; // Round constant.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
374
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
375 #if 0
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
376 // matt
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
377 unsigned char BOOTFLASH * key = kTable;
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parents: 5
diff changeset
378 #endif
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379
10
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parents: 5
diff changeset
380 // Copy key to start of expanded key.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
381 i = KEYLENGTH;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
382 do {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
383 *expandedKey = *key;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
384 expandedKey++;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
385 key++;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
386 } while( --i );
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
387
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
388 // Prepare last 4 bytes of key in temp.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
389 expandedKey -= 4;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
390 temp[0] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
391 temp[1] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
392 temp[2] = *(expandedKey++);
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
393 temp[3] = *(expandedKey++);
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
395 // Expand key.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
396 i = KEYLENGTH;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
397 while( i < BLOCKSIZE*(ROUNDS+1) ) {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
398 // Are we at the start of a multiple of the key size?
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
399 if( (i % KEYLENGTH) == 0 ) {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
400 CycleLeft( temp ); // Cycle left once.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
401 SubBytes( temp, 4 ); // Substitute each byte.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
402 XORBytes( temp, Rcon, 4 ); // Add constant in GF(2).
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
403 *Rcon = (*Rcon << 1) ^ (*Rcon & 0x80 ? BPOLY : 0);
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
404 }
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
406 // Keysize larger than 24 bytes, ie. larger that 192 bits?
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
407 #if KEYLENGTH > 24
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
408 // Are we right past a block size?
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
409 else if( (i % KEYLENGTH) == BLOCKSIZE ) {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
410 SubBytes( temp, 4 ); // Substitute each byte.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
411 }
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
412 #endif
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
414 // Add bytes in GF(2) one KEYLENGTH away.
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
415 XORBytes( temp, expandedKey - KEYLENGTH, 4 );
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416
10
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
417 // Copy result to current 4 bytes.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
418 *(expandedKey++) = temp[ 0 ];
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
419 *(expandedKey++) = temp[ 1 ];
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
420 *(expandedKey++) = temp[ 2 ];
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
421 *(expandedKey++) = temp[ 3 ];
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
422
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
423 i += 4; // Next 4 bytes.
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
424 }
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426
10
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
427
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
428
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
429 void InvCipher( byte * block, byte * expandedKey )
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
430 {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
431 byte round = ROUNDS-1;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
432 expandedKey += BLOCKSIZE * ROUNDS;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
433
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
434 XORBytes( block, expandedKey, 16 );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
435 expandedKey -= BLOCKSIZE;
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436
10
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
437 do {
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
438 InvShiftRows( block );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
439 InvSubBytesAndXOR( block, expandedKey, 16 );
439b7aaaec9e Get aes from avr231 appnote instead
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440 expandedKey -= BLOCKSIZE;
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Matt Johnston <matt@ucc.asn.au>
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441 InvMixColumns( block );
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442 } while( --round );
3
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443
10
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444 InvShiftRows( block );
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445 InvSubBytesAndXOR( block, expandedKey, 16 );
3
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446 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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447
10
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parents: 5
diff changeset
448
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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449
10
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450 void aesInit( unsigned char *key, unsigned char * tempbuf )
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451 {
10
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452 powTbl = block1;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
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453 logTbl = block2;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
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454 CalcPowLog( powTbl, logTbl );
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
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455
10
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parents: 5
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456 sBox = tempbuf;
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
457 CalcSBox( sBox );
3
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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diff changeset
458
10
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
459 expandedKey = block1;
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
460 KeyExpansion( key, expandedKey );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
461
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462 sBoxInv = block2; // Must be block2.
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Matt Johnston <matt@ucc.asn.au>
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463 CalcSBoxInv( sBox, sBoxInv );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
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464 }
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parents: 5
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465
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parents: 5
diff changeset
466
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467
10
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Matt Johnston <matt@ucc.asn.au>
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468 void aesDecrypt( unsigned char * buffer, unsigned char * chainBlock )
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
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469 {
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parents: 5
diff changeset
470 byte temp[ BLOCKSIZE ];
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Matt Johnston <matt@ucc.asn.au>
parents: 5
diff changeset
471
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Matt Johnston <matt@ucc.asn.au>
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472 CopyBytes( temp, buffer, BLOCKSIZE );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
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473 InvCipher( buffer, expandedKey );
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diff changeset
474 if (chainBlock)
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
475 {
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476 XORBytes( buffer, chainBlock, BLOCKSIZE );
439b7aaaec9e Get aes from avr231 appnote instead
Matt Johnston <matt@ucc.asn.au>
parents: 5
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477 CopyBytes( chainBlock, temp, BLOCKSIZE );
3
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478 }
ca3a006e292c add aes.c from http://www.pittnerovi.com/jiri/hobby/electronics/crypto/
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parents:
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479 }
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480
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481 #endif