| 1 | /* Aes.c -- AES encryption / decryption\r |
| 2 | 2016-05-21 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #include "Precomp.h"\r |
| 5 | \r |
| 6 | #include "Aes.h"\r |
| 7 | #include "CpuArch.h"\r |
| 8 | \r |
| 9 | static UInt32 T[256 * 4];\r |
| 10 | static const Byte Sbox[256] = {\r |
| 11 | 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,\r |
| 12 | 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,\r |
| 13 | 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,\r |
| 14 | 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,\r |
| 15 | 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,\r |
| 16 | 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,\r |
| 17 | 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,\r |
| 18 | 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,\r |
| 19 | 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,\r |
| 20 | 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,\r |
| 21 | 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,\r |
| 22 | 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,\r |
| 23 | 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,\r |
| 24 | 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,\r |
| 25 | 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,\r |
| 26 | 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16};\r |
| 27 | \r |
| 28 | void MY_FAST_CALL AesCbc_Encode(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 29 | void MY_FAST_CALL AesCbc_Decode(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 30 | void MY_FAST_CALL AesCtr_Code(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 31 | \r |
| 32 | void MY_FAST_CALL AesCbc_Encode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 33 | void MY_FAST_CALL AesCbc_Decode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 34 | void MY_FAST_CALL AesCtr_Code_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
| 35 | \r |
| 36 | AES_CODE_FUNC g_AesCbc_Encode;\r |
| 37 | AES_CODE_FUNC g_AesCbc_Decode;\r |
| 38 | AES_CODE_FUNC g_AesCtr_Code;\r |
| 39 | \r |
| 40 | static UInt32 D[256 * 4];\r |
| 41 | static Byte InvS[256];\r |
| 42 | \r |
| 43 | static const Byte Rcon[11] = { 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };\r |
| 44 | \r |
| 45 | #define xtime(x) ((((x) << 1) ^ (((x) & 0x80) != 0 ? 0x1B : 0)) & 0xFF)\r |
| 46 | \r |
| 47 | #define Ui32(a0, a1, a2, a3) ((UInt32)(a0) | ((UInt32)(a1) << 8) | ((UInt32)(a2) << 16) | ((UInt32)(a3) << 24))\r |
| 48 | \r |
| 49 | #define gb0(x) ( (x) & 0xFF)\r |
| 50 | #define gb1(x) (((x) >> ( 8)) & 0xFF)\r |
| 51 | #define gb2(x) (((x) >> (16)) & 0xFF)\r |
| 52 | #define gb3(x) (((x) >> (24)) & 0xFF)\r |
| 53 | \r |
| 54 | void AesGenTables(void)\r |
| 55 | {\r |
| 56 | unsigned i;\r |
| 57 | for (i = 0; i < 256; i++)\r |
| 58 | InvS[Sbox[i]] = (Byte)i;\r |
| 59 | \r |
| 60 | for (i = 0; i < 256; i++)\r |
| 61 | {\r |
| 62 | {\r |
| 63 | UInt32 a1 = Sbox[i];\r |
| 64 | UInt32 a2 = xtime(a1);\r |
| 65 | UInt32 a3 = a2 ^ a1;\r |
| 66 | T[ i] = Ui32(a2, a1, a1, a3);\r |
| 67 | T[0x100 + i] = Ui32(a3, a2, a1, a1);\r |
| 68 | T[0x200 + i] = Ui32(a1, a3, a2, a1);\r |
| 69 | T[0x300 + i] = Ui32(a1, a1, a3, a2);\r |
| 70 | }\r |
| 71 | {\r |
| 72 | UInt32 a1 = InvS[i];\r |
| 73 | UInt32 a2 = xtime(a1);\r |
| 74 | UInt32 a4 = xtime(a2);\r |
| 75 | UInt32 a8 = xtime(a4);\r |
| 76 | UInt32 a9 = a8 ^ a1;\r |
| 77 | UInt32 aB = a8 ^ a2 ^ a1;\r |
| 78 | UInt32 aD = a8 ^ a4 ^ a1;\r |
| 79 | UInt32 aE = a8 ^ a4 ^ a2;\r |
| 80 | D[ i] = Ui32(aE, a9, aD, aB);\r |
| 81 | D[0x100 + i] = Ui32(aB, aE, a9, aD);\r |
| 82 | D[0x200 + i] = Ui32(aD, aB, aE, a9);\r |
| 83 | D[0x300 + i] = Ui32(a9, aD, aB, aE);\r |
| 84 | }\r |
| 85 | }\r |
| 86 | \r |
| 87 | g_AesCbc_Encode = AesCbc_Encode;\r |
| 88 | g_AesCbc_Decode = AesCbc_Decode;\r |
| 89 | g_AesCtr_Code = AesCtr_Code;\r |
| 90 | \r |
| 91 | #ifdef MY_CPU_X86_OR_AMD64\r |
| 92 | if (CPU_Is_Aes_Supported())\r |
| 93 | {\r |
| 94 | g_AesCbc_Encode = AesCbc_Encode_Intel;\r |
| 95 | g_AesCbc_Decode = AesCbc_Decode_Intel;\r |
| 96 | g_AesCtr_Code = AesCtr_Code_Intel;\r |
| 97 | }\r |
| 98 | #endif\r |
| 99 | }\r |
| 100 | \r |
| 101 | \r |
| 102 | #define HT(i, x, s) (T + (x << 8))[gb ## x(s[(i + x) & 3])]\r |
| 103 | \r |
| 104 | #define HT4(m, i, s, p) m[i] = \\r |
| 105 | HT(i, 0, s) ^ \\r |
| 106 | HT(i, 1, s) ^ \\r |
| 107 | HT(i, 2, s) ^ \\r |
| 108 | HT(i, 3, s) ^ w[p + i]\r |
| 109 | \r |
| 110 | #define HT16(m, s, p) \\r |
| 111 | HT4(m, 0, s, p); \\r |
| 112 | HT4(m, 1, s, p); \\r |
| 113 | HT4(m, 2, s, p); \\r |
| 114 | HT4(m, 3, s, p); \\r |
| 115 | \r |
| 116 | #define FT(i, x) Sbox[gb ## x(m[(i + x) & 3])]\r |
| 117 | #define FT4(i) dest[i] = Ui32(FT(i, 0), FT(i, 1), FT(i, 2), FT(i, 3)) ^ w[i];\r |
| 118 | \r |
| 119 | \r |
| 120 | #define HD(i, x, s) (D + (x << 8))[gb ## x(s[(i - x) & 3])]\r |
| 121 | \r |
| 122 | #define HD4(m, i, s, p) m[i] = \\r |
| 123 | HD(i, 0, s) ^ \\r |
| 124 | HD(i, 1, s) ^ \\r |
| 125 | HD(i, 2, s) ^ \\r |
| 126 | HD(i, 3, s) ^ w[p + i];\r |
| 127 | \r |
| 128 | #define HD16(m, s, p) \\r |
| 129 | HD4(m, 0, s, p); \\r |
| 130 | HD4(m, 1, s, p); \\r |
| 131 | HD4(m, 2, s, p); \\r |
| 132 | HD4(m, 3, s, p); \\r |
| 133 | \r |
| 134 | #define FD(i, x) InvS[gb ## x(m[(i - x) & 3])]\r |
| 135 | #define FD4(i) dest[i] = Ui32(FD(i, 0), FD(i, 1), FD(i, 2), FD(i, 3)) ^ w[i];\r |
| 136 | \r |
| 137 | void MY_FAST_CALL Aes_SetKey_Enc(UInt32 *w, const Byte *key, unsigned keySize)\r |
| 138 | {\r |
| 139 | unsigned i, wSize;\r |
| 140 | wSize = keySize + 28;\r |
| 141 | keySize /= 4;\r |
| 142 | w[0] = ((UInt32)keySize / 2) + 3;\r |
| 143 | w += 4;\r |
| 144 | \r |
| 145 | for (i = 0; i < keySize; i++, key += 4)\r |
| 146 | w[i] = GetUi32(key);\r |
| 147 | \r |
| 148 | for (; i < wSize; i++)\r |
| 149 | {\r |
| 150 | UInt32 t = w[i - 1];\r |
| 151 | unsigned rem = i % keySize;\r |
| 152 | if (rem == 0)\r |
| 153 | t = Ui32(Sbox[gb1(t)] ^ Rcon[i / keySize], Sbox[gb2(t)], Sbox[gb3(t)], Sbox[gb0(t)]);\r |
| 154 | else if (keySize > 6 && rem == 4)\r |
| 155 | t = Ui32(Sbox[gb0(t)], Sbox[gb1(t)], Sbox[gb2(t)], Sbox[gb3(t)]);\r |
| 156 | w[i] = w[i - keySize] ^ t;\r |
| 157 | }\r |
| 158 | }\r |
| 159 | \r |
| 160 | void MY_FAST_CALL Aes_SetKey_Dec(UInt32 *w, const Byte *key, unsigned keySize)\r |
| 161 | {\r |
| 162 | unsigned i, num;\r |
| 163 | Aes_SetKey_Enc(w, key, keySize);\r |
| 164 | num = keySize + 20;\r |
| 165 | w += 8;\r |
| 166 | for (i = 0; i < num; i++)\r |
| 167 | {\r |
| 168 | UInt32 r = w[i];\r |
| 169 | w[i] =\r |
| 170 | D[ (unsigned)Sbox[gb0(r)]] ^\r |
| 171 | D[0x100 + (unsigned)Sbox[gb1(r)]] ^\r |
| 172 | D[0x200 + (unsigned)Sbox[gb2(r)]] ^\r |
| 173 | D[0x300 + (unsigned)Sbox[gb3(r)]];\r |
| 174 | }\r |
| 175 | }\r |
| 176 | \r |
| 177 | /* Aes_Encode and Aes_Decode functions work with little-endian words.\r |
| 178 | src and dest are pointers to 4 UInt32 words.\r |
| 179 | src and dest can point to same block */\r |
| 180 | \r |
| 181 | static void Aes_Encode(const UInt32 *w, UInt32 *dest, const UInt32 *src)\r |
| 182 | {\r |
| 183 | UInt32 s[4];\r |
| 184 | UInt32 m[4];\r |
| 185 | UInt32 numRounds2 = w[0];\r |
| 186 | w += 4;\r |
| 187 | s[0] = src[0] ^ w[0];\r |
| 188 | s[1] = src[1] ^ w[1];\r |
| 189 | s[2] = src[2] ^ w[2];\r |
| 190 | s[3] = src[3] ^ w[3];\r |
| 191 | w += 4;\r |
| 192 | for (;;)\r |
| 193 | {\r |
| 194 | HT16(m, s, 0);\r |
| 195 | if (--numRounds2 == 0)\r |
| 196 | break;\r |
| 197 | HT16(s, m, 4);\r |
| 198 | w += 8;\r |
| 199 | }\r |
| 200 | w += 4;\r |
| 201 | FT4(0); FT4(1); FT4(2); FT4(3);\r |
| 202 | }\r |
| 203 | \r |
| 204 | static void Aes_Decode(const UInt32 *w, UInt32 *dest, const UInt32 *src)\r |
| 205 | {\r |
| 206 | UInt32 s[4];\r |
| 207 | UInt32 m[4];\r |
| 208 | UInt32 numRounds2 = w[0];\r |
| 209 | w += 4 + numRounds2 * 8;\r |
| 210 | s[0] = src[0] ^ w[0];\r |
| 211 | s[1] = src[1] ^ w[1];\r |
| 212 | s[2] = src[2] ^ w[2];\r |
| 213 | s[3] = src[3] ^ w[3];\r |
| 214 | for (;;)\r |
| 215 | {\r |
| 216 | w -= 8;\r |
| 217 | HD16(m, s, 4);\r |
| 218 | if (--numRounds2 == 0)\r |
| 219 | break;\r |
| 220 | HD16(s, m, 0);\r |
| 221 | }\r |
| 222 | FD4(0); FD4(1); FD4(2); FD4(3);\r |
| 223 | }\r |
| 224 | \r |
| 225 | void AesCbc_Init(UInt32 *p, const Byte *iv)\r |
| 226 | {\r |
| 227 | unsigned i;\r |
| 228 | for (i = 0; i < 4; i++)\r |
| 229 | p[i] = GetUi32(iv + i * 4);\r |
| 230 | }\r |
| 231 | \r |
| 232 | void MY_FAST_CALL AesCbc_Encode(UInt32 *p, Byte *data, size_t numBlocks)\r |
| 233 | {\r |
| 234 | for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)\r |
| 235 | {\r |
| 236 | p[0] ^= GetUi32(data);\r |
| 237 | p[1] ^= GetUi32(data + 4);\r |
| 238 | p[2] ^= GetUi32(data + 8);\r |
| 239 | p[3] ^= GetUi32(data + 12);\r |
| 240 | \r |
| 241 | Aes_Encode(p + 4, p, p);\r |
| 242 | \r |
| 243 | SetUi32(data, p[0]);\r |
| 244 | SetUi32(data + 4, p[1]);\r |
| 245 | SetUi32(data + 8, p[2]);\r |
| 246 | SetUi32(data + 12, p[3]);\r |
| 247 | }\r |
| 248 | }\r |
| 249 | \r |
| 250 | void MY_FAST_CALL AesCbc_Decode(UInt32 *p, Byte *data, size_t numBlocks)\r |
| 251 | {\r |
| 252 | UInt32 in[4], out[4];\r |
| 253 | for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)\r |
| 254 | {\r |
| 255 | in[0] = GetUi32(data);\r |
| 256 | in[1] = GetUi32(data + 4);\r |
| 257 | in[2] = GetUi32(data + 8);\r |
| 258 | in[3] = GetUi32(data + 12);\r |
| 259 | \r |
| 260 | Aes_Decode(p + 4, out, in);\r |
| 261 | \r |
| 262 | SetUi32(data, p[0] ^ out[0]);\r |
| 263 | SetUi32(data + 4, p[1] ^ out[1]);\r |
| 264 | SetUi32(data + 8, p[2] ^ out[2]);\r |
| 265 | SetUi32(data + 12, p[3] ^ out[3]);\r |
| 266 | \r |
| 267 | p[0] = in[0];\r |
| 268 | p[1] = in[1];\r |
| 269 | p[2] = in[2];\r |
| 270 | p[3] = in[3];\r |
| 271 | }\r |
| 272 | }\r |
| 273 | \r |
| 274 | void MY_FAST_CALL AesCtr_Code(UInt32 *p, Byte *data, size_t numBlocks)\r |
| 275 | {\r |
| 276 | for (; numBlocks != 0; numBlocks--)\r |
| 277 | {\r |
| 278 | UInt32 temp[4];\r |
| 279 | Byte buf[16];\r |
| 280 | int i;\r |
| 281 | \r |
| 282 | if (++p[0] == 0)\r |
| 283 | p[1]++;\r |
| 284 | \r |
| 285 | Aes_Encode(p + 4, temp, p);\r |
| 286 | \r |
| 287 | SetUi32(buf, temp[0]);\r |
| 288 | SetUi32(buf + 4, temp[1]);\r |
| 289 | SetUi32(buf + 8, temp[2]);\r |
| 290 | SetUi32(buf + 12, temp[3]);\r |
| 291 | \r |
| 292 | for (i = 0; i < 16; i++)\r |
| 293 | *data++ ^= buf[i];\r |
| 294 | }\r |
| 295 | }\r |