lib/crypto/aes.h

   1 /*
   2  * Copyright (c) 2003-2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* $Id$ */
  35
  36 #ifndef LIB_CRYPTO_AES_H
  37 #define LIB_CRYPTO_AES_H 1
  38
  39 #include "aesni.h"
  40
  41 #define SAMBA_RIJNDAEL 1
  42 #define SAMBA_AES_CBC_ENCRYPT 1
  43 #define SAMBA_AES_CFB8_ENCRYPT 1
  44 #define SAMBA_AES_BLOCK_XOR 1
  45
  46 /* symbol renaming */
  47 #define AES_set_encrypt_key samba_AES_set_encrypt_key
  48 #define AES_set_decrypt_key samba_AES_decrypt_key
  49 #define AES_encrypt samba_AES_encrypt
  50 #define AES_decrypt samba_AES_decrypt
  51 #define AES_cbc_encrypt samba_AES_cbc_encrypt
  52 #define AES_cfb8_encrypt samba_AES_cfb8_encrypt
  53
  54 /*
  55  *
  56  */
  57
  58 #define AES_BLOCK_SIZE 16
  59 #define AES_MAXNR 14
  60
  61 #define AES_ENCRYPT 1
  62 #define AES_DECRYPT 0
  63
  64 struct aes_key_rj {
  65     uint32_t key[(AES_MAXNR+1)*4];
  66     int rounds;
  67 };
  68
  69 typedef struct aes_key {
  70         union {
  71                 struct aes_key_rj aes_rj;
  72                 struct crypto_aesni_ctx aes_ni;
  73         } u;
  74 } AES_KEY;
  75
  76 #ifdef __cplusplus
  77 extern "C" {
  78 #endif
  79
  80 int AES_set_encrypt_key(const unsigned char *, const int, AES_KEY *);
  81 int AES_set_decrypt_key(const unsigned char *, const int, AES_KEY *);
  82
  83 void AES_encrypt(const unsigned char *, unsigned char *, const AES_KEY *);
  84 void AES_decrypt(const unsigned char *, unsigned char *, const AES_KEY *);
  85
  86 void AES_cbc_encrypt(const unsigned char *, unsigned char *,
  87                      const unsigned long, const AES_KEY *,
  88                      unsigned char *, int);
  89
  90 void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
  91                       unsigned long size, const AES_KEY *key,
  92                       unsigned char *iv, int forward_encrypt);
  93
  94 #define aes_cfb8_encrypt(in, out, size, key, iv, forward_encrypt) \
  95         AES_cfb8_encrypt(in, out, size, key, iv, forward_encrypt)
  96
  97 #ifdef  __cplusplus
  98 }
  99 #endif
 100
 101 #ifdef SAMBA_AES_BLOCK_XOR
 102 static inline void aes_block_xor(const uint8_t in1[AES_BLOCK_SIZE],
 103                                  const uint8_t in2[AES_BLOCK_SIZE],
 104                                  uint8_t out[AES_BLOCK_SIZE])
 105 {
 106 #define __IS_ALIGN8(p) ((((uintptr_t)(p)) & 0x7) == 0)
 107 #define __IS_ALIGNED(a,b,c) __IS_ALIGN8(\
 108                 ((uintptr_t)(a)) | \
 109                 ((uintptr_t)(b)) | \
 110                 ((uintptr_t)(c)))
 111         /* If everything is aligned we can optimize */
 112         if (likely(__IS_ALIGNED(in1, in2, out))) {
 113 #define __RO64(p) ((const uint64_t *)(p))
 114 #define __RW64(p) ((uint64_t *)(p))
 115                 __RW64(out)[0] = __RO64(in1)[0] ^ __RO64(in2)[0];
 116                 __RW64(out)[1] = __RO64(in1)[1] ^ __RO64(in2)[1];
 117         } else {
 118                 uint64_t i1[2];
 119                 uint64_t i2[2];
 120                 uint64_t o[2];
 121
 122                 memcpy(i1, in1, AES_BLOCK_SIZE);
 123                 memcpy(i2, in2, AES_BLOCK_SIZE);
 124                 o[0] = i1[0] ^ i2[0];
 125                 o[1] = i1[1] ^ i2[1];
 126                 memcpy(out, o, AES_BLOCK_SIZE);
 127         }
 128 }
 129 #endif /* SAMBA_AES_BLOCK_XOR */
 130
 131 static inline void aes_block_lshift(const uint8_t in[AES_BLOCK_SIZE],
 132                                     uint8_t out[AES_BLOCK_SIZE])
 133 {
 134         static const struct aes_block_lshift_entry {
 135                 uint8_t lshift;
 136                 uint8_t overflow;
 137         } aes_block_lshift_table[UINT8_MAX+1] = {
 138                 [0x00] = { .lshift = 0x00, .overflow = 0x00 },
 139                 [0x01] = { .lshift = 0x02, .overflow = 0x00 },
 140                 [0x02] = { .lshift = 0x04, .overflow = 0x00 },
 141                 [0x03] = { .lshift = 0x06, .overflow = 0x00 },
 142                 [0x04] = { .lshift = 0x08, .overflow = 0x00 },
 143                 [0x05] = { .lshift = 0x0a, .overflow = 0x00 },
 144                 [0x06] = { .lshift = 0x0c, .overflow = 0x00 },
 145                 [0x07] = { .lshift = 0x0e, .overflow = 0x00 },
 146                 [0x08] = { .lshift = 0x10, .overflow = 0x00 },
 147                 [0x09] = { .lshift = 0x12, .overflow = 0x00 },
 148                 [0x0a] = { .lshift = 0x14, .overflow = 0x00 },
 149                 [0x0b] = { .lshift = 0x16, .overflow = 0x00 },
 150                 [0x0c] = { .lshift = 0x18, .overflow = 0x00 },
 151                 [0x0d] = { .lshift = 0x1a, .overflow = 0x00 },
 152                 [0x0e] = { .lshift = 0x1c, .overflow = 0x00 },
 153                 [0x0f] = { .lshift = 0x1e, .overflow = 0x00 },
 154                 [0x10] = { .lshift = 0x20, .overflow = 0x00 },
 155                 [0x11] = { .lshift = 0x22, .overflow = 0x00 },
 156                 [0x12] = { .lshift = 0x24, .overflow = 0x00 },
 157                 [0x13] = { .lshift = 0x26, .overflow = 0x00 },
 158                 [0x14] = { .lshift = 0x28, .overflow = 0x00 },
 159                 [0x15] = { .lshift = 0x2a, .overflow = 0x00 },
 160                 [0x16] = { .lshift = 0x2c, .overflow = 0x00 },
 161                 [0x17] = { .lshift = 0x2e, .overflow = 0x00 },
 162                 [0x18] = { .lshift = 0x30, .overflow = 0x00 },
 163                 [0x19] = { .lshift = 0x32, .overflow = 0x00 },
 164                 [0x1a] = { .lshift = 0x34, .overflow = 0x00 },
 165                 [0x1b] = { .lshift = 0x36, .overflow = 0x00 },
 166                 [0x1c] = { .lshift = 0x38, .overflow = 0x00 },
 167                 [0x1d] = { .lshift = 0x3a, .overflow = 0x00 },
 168                 [0x1e] = { .lshift = 0x3c, .overflow = 0x00 },
 169                 [0x1f] = { .lshift = 0x3e, .overflow = 0x00 },
 170                 [0x20] = { .lshift = 0x40, .overflow = 0x00 },
 171                 [0x21] = { .lshift = 0x42, .overflow = 0x00 },
 172                 [0x22] = { .lshift = 0x44, .overflow = 0x00 },
 173                 [0x23] = { .lshift = 0x46, .overflow = 0x00 },
 174                 [0x24] = { .lshift = 0x48, .overflow = 0x00 },
 175                 [0x25] = { .lshift = 0x4a, .overflow = 0x00 },
 176                 [0x26] = { .lshift = 0x4c, .overflow = 0x00 },
 177                 [0x27] = { .lshift = 0x4e, .overflow = 0x00 },
 178                 [0x28] = { .lshift = 0x50, .overflow = 0x00 },
 179                 [0x29] = { .lshift = 0x52, .overflow = 0x00 },
 180                 [0x2a] = { .lshift = 0x54, .overflow = 0x00 },
 181                 [0x2b] = { .lshift = 0x56, .overflow = 0x00 },
 182                 [0x2c] = { .lshift = 0x58, .overflow = 0x00 },
 183                 [0x2d] = { .lshift = 0x5a, .overflow = 0x00 },
 184                 [0x2e] = { .lshift = 0x5c, .overflow = 0x00 },
 185                 [0x2f] = { .lshift = 0x5e, .overflow = 0x00 },
 186                 [0x30] = { .lshift = 0x60, .overflow = 0x00 },
 187                 [0x31] = { .lshift = 0x62, .overflow = 0x00 },
 188                 [0x32] = { .lshift = 0x64, .overflow = 0x00 },
 189                 [0x33] = { .lshift = 0x66, .overflow = 0x00 },
 190                 [0x34] = { .lshift = 0x68, .overflow = 0x00 },
 191                 [0x35] = { .lshift = 0x6a, .overflow = 0x00 },
 192                 [0x36] = { .lshift = 0x6c, .overflow = 0x00 },
 193                 [0x37] = { .lshift = 0x6e, .overflow = 0x00 },
 194                 [0x38] = { .lshift = 0x70, .overflow = 0x00 },
 195                 [0x39] = { .lshift = 0x72, .overflow = 0x00 },
 196                 [0x3a] = { .lshift = 0x74, .overflow = 0x00 },
 197                 [0x3b] = { .lshift = 0x76, .overflow = 0x00 },
 198                 [0x3c] = { .lshift = 0x78, .overflow = 0x00 },
 199                 [0x3d] = { .lshift = 0x7a, .overflow = 0x00 },
 200                 [0x3e] = { .lshift = 0x7c, .overflow = 0x00 },
 201                 [0x3f] = { .lshift = 0x7e, .overflow = 0x00 },
 202                 [0x40] = { .lshift = 0x80, .overflow = 0x00 },
 203                 [0x41] = { .lshift = 0x82, .overflow = 0x00 },
 204                 [0x42] = { .lshift = 0x84, .overflow = 0x00 },
 205                 [0x43] = { .lshift = 0x86, .overflow = 0x00 },
 206                 [0x44] = { .lshift = 0x88, .overflow = 0x00 },
 207                 [0x45] = { .lshift = 0x8a, .overflow = 0x00 },
 208                 [0x46] = { .lshift = 0x8c, .overflow = 0x00 },
 209                 [0x47] = { .lshift = 0x8e, .overflow = 0x00 },
 210                 [0x48] = { .lshift = 0x90, .overflow = 0x00 },
 211                 [0x49] = { .lshift = 0x92, .overflow = 0x00 },
 212                 [0x4a] = { .lshift = 0x94, .overflow = 0x00 },
 213                 [0x4b] = { .lshift = 0x96, .overflow = 0x00 },
 214                 [0x4c] = { .lshift = 0x98, .overflow = 0x00 },
 215                 [0x4d] = { .lshift = 0x9a, .overflow = 0x00 },
 216                 [0x4e] = { .lshift = 0x9c, .overflow = 0x00 },
 217                 [0x4f] = { .lshift = 0x9e, .overflow = 0x00 },
 218                 [0x50] = { .lshift = 0xa0, .overflow = 0x00 },
 219                 [0x51] = { .lshift = 0xa2, .overflow = 0x00 },
 220                 [0x52] = { .lshift = 0xa4, .overflow = 0x00 },
 221                 [0x53] = { .lshift = 0xa6, .overflow = 0x00 },
 222                 [0x54] = { .lshift = 0xa8, .overflow = 0x00 },
 223                 [0x55] = { .lshift = 0xaa, .overflow = 0x00 },
 224                 [0x56] = { .lshift = 0xac, .overflow = 0x00 },
 225                 [0x57] = { .lshift = 0xae, .overflow = 0x00 },
 226                 [0x58] = { .lshift = 0xb0, .overflow = 0x00 },
 227                 [0x59] = { .lshift = 0xb2, .overflow = 0x00 },
 228                 [0x5a] = { .lshift = 0xb4, .overflow = 0x00 },
 229                 [0x5b] = { .lshift = 0xb6, .overflow = 0x00 },
 230                 [0x5c] = { .lshift = 0xb8, .overflow = 0x00 },
 231                 [0x5d] = { .lshift = 0xba, .overflow = 0x00 },
 232                 [0x5e] = { .lshift = 0xbc, .overflow = 0x00 },
 233                 [0x5f] = { .lshift = 0xbe, .overflow = 0x00 },
 234                 [0x60] = { .lshift = 0xc0, .overflow = 0x00 },
 235                 [0x61] = { .lshift = 0xc2, .overflow = 0x00 },
 236                 [0x62] = { .lshift = 0xc4, .overflow = 0x00 },
 237                 [0x63] = { .lshift = 0xc6, .overflow = 0x00 },
 238                 [0x64] = { .lshift = 0xc8, .overflow = 0x00 },
 239                 [0x65] = { .lshift = 0xca, .overflow = 0x00 },
 240                 [0x66] = { .lshift = 0xcc, .overflow = 0x00 },
 241                 [0x67] = { .lshift = 0xce, .overflow = 0x00 },
 242                 [0x68] = { .lshift = 0xd0, .overflow = 0x00 },
 243                 [0x69] = { .lshift = 0xd2, .overflow = 0x00 },
 244                 [0x6a] = { .lshift = 0xd4, .overflow = 0x00 },
 245                 [0x6b] = { .lshift = 0xd6, .overflow = 0x00 },
 246                 [0x6c] = { .lshift = 0xd8, .overflow = 0x00 },
 247                 [0x6d] = { .lshift = 0xda, .overflow = 0x00 },
 248                 [0x6e] = { .lshift = 0xdc, .overflow = 0x00 },
 249                 [0x6f] = { .lshift = 0xde, .overflow = 0x00 },
 250                 [0x70] = { .lshift = 0xe0, .overflow = 0x00 },
 251                 [0x71] = { .lshift = 0xe2, .overflow = 0x00 },
 252                 [0x72] = { .lshift = 0xe4, .overflow = 0x00 },
 253                 [0x73] = { .lshift = 0xe6, .overflow = 0x00 },
 254                 [0x74] = { .lshift = 0xe8, .overflow = 0x00 },
 255                 [0x75] = { .lshift = 0xea, .overflow = 0x00 },
 256                 [0x76] = { .lshift = 0xec, .overflow = 0x00 },
 257                 [0x77] = { .lshift = 0xee, .overflow = 0x00 },
 258                 [0x78] = { .lshift = 0xf0, .overflow = 0x00 },
 259                 [0x79] = { .lshift = 0xf2, .overflow = 0x00 },
 260                 [0x7a] = { .lshift = 0xf4, .overflow = 0x00 },
 261                 [0x7b] = { .lshift = 0xf6, .overflow = 0x00 },
 262                 [0x7c] = { .lshift = 0xf8, .overflow = 0x00 },
 263                 [0x7d] = { .lshift = 0xfa, .overflow = 0x00 },
 264                 [0x7e] = { .lshift = 0xfc, .overflow = 0x00 },
 265                 [0x7f] = { .lshift = 0xfe, .overflow = 0x00 },
 266                 [0x80] = { .lshift = 0x00, .overflow = 0x01 },
 267                 [0x81] = { .lshift = 0x02, .overflow = 0x01 },
 268                 [0x82] = { .lshift = 0x04, .overflow = 0x01 },
 269                 [0x83] = { .lshift = 0x06, .overflow = 0x01 },
 270                 [0x84] = { .lshift = 0x08, .overflow = 0x01 },
 271                 [0x85] = { .lshift = 0x0a, .overflow = 0x01 },
 272                 [0x86] = { .lshift = 0x0c, .overflow = 0x01 },
 273                 [0x87] = { .lshift = 0x0e, .overflow = 0x01 },
 274                 [0x88] = { .lshift = 0x10, .overflow = 0x01 },
 275                 [0x89] = { .lshift = 0x12, .overflow = 0x01 },
 276                 [0x8a] = { .lshift = 0x14, .overflow = 0x01 },
 277                 [0x8b] = { .lshift = 0x16, .overflow = 0x01 },
 278                 [0x8c] = { .lshift = 0x18, .overflow = 0x01 },
 279                 [0x8d] = { .lshift = 0x1a, .overflow = 0x01 },
 280                 [0x8e] = { .lshift = 0x1c, .overflow = 0x01 },
 281                 [0x8f] = { .lshift = 0x1e, .overflow = 0x01 },
 282                 [0x90] = { .lshift = 0x20, .overflow = 0x01 },
 283                 [0x91] = { .lshift = 0x22, .overflow = 0x01 },
 284                 [0x92] = { .lshift = 0x24, .overflow = 0x01 },
 285                 [0x93] = { .lshift = 0x26, .overflow = 0x01 },
 286                 [0x94] = { .lshift = 0x28, .overflow = 0x01 },
 287                 [0x95] = { .lshift = 0x2a, .overflow = 0x01 },
 288                 [0x96] = { .lshift = 0x2c, .overflow = 0x01 },
 289                 [0x97] = { .lshift = 0x2e, .overflow = 0x01 },
 290                 [0x98] = { .lshift = 0x30, .overflow = 0x01 },
 291                 [0x99] = { .lshift = 0x32, .overflow = 0x01 },
 292                 [0x9a] = { .lshift = 0x34, .overflow = 0x01 },
 293                 [0x9b] = { .lshift = 0x36, .overflow = 0x01 },
 294                 [0x9c] = { .lshift = 0x38, .overflow = 0x01 },
 295                 [0x9d] = { .lshift = 0x3a, .overflow = 0x01 },
 296                 [0x9e] = { .lshift = 0x3c, .overflow = 0x01 },
 297                 [0x9f] = { .lshift = 0x3e, .overflow = 0x01 },
 298                 [0xa0] = { .lshift = 0x40, .overflow = 0x01 },
 299                 [0xa1] = { .lshift = 0x42, .overflow = 0x01 },
 300                 [0xa2] = { .lshift = 0x44, .overflow = 0x01 },
 301                 [0xa3] = { .lshift = 0x46, .overflow = 0x01 },
 302                 [0xa4] = { .lshift = 0x48, .overflow = 0x01 },
 303                 [0xa5] = { .lshift = 0x4a, .overflow = 0x01 },
 304                 [0xa6] = { .lshift = 0x4c, .overflow = 0x01 },
 305                 [0xa7] = { .lshift = 0x4e, .overflow = 0x01 },
 306                 [0xa8] = { .lshift = 0x50, .overflow = 0x01 },
 307                 [0xa9] = { .lshift = 0x52, .overflow = 0x01 },
 308                 [0xaa] = { .lshift = 0x54, .overflow = 0x01 },
 309                 [0xab] = { .lshift = 0x56, .overflow = 0x01 },
 310                 [0xac] = { .lshift = 0x58, .overflow = 0x01 },
 311                 [0xad] = { .lshift = 0x5a, .overflow = 0x01 },
 312                 [0xae] = { .lshift = 0x5c, .overflow = 0x01 },
 313                 [0xaf] = { .lshift = 0x5e, .overflow = 0x01 },
 314                 [0xb0] = { .lshift = 0x60, .overflow = 0x01 },
 315                 [0xb1] = { .lshift = 0x62, .overflow = 0x01 },
 316                 [0xb2] = { .lshift = 0x64, .overflow = 0x01 },
 317                 [0xb3] = { .lshift = 0x66, .overflow = 0x01 },
 318                 [0xb4] = { .lshift = 0x68, .overflow = 0x01 },
 319                 [0xb5] = { .lshift = 0x6a, .overflow = 0x01 },
 320                 [0xb6] = { .lshift = 0x6c, .overflow = 0x01 },
 321                 [0xb7] = { .lshift = 0x6e, .overflow = 0x01 },
 322                 [0xb8] = { .lshift = 0x70, .overflow = 0x01 },
 323                 [0xb9] = { .lshift = 0x72, .overflow = 0x01 },
 324                 [0xba] = { .lshift = 0x74, .overflow = 0x01 },
 325                 [0xbb] = { .lshift = 0x76, .overflow = 0x01 },
 326                 [0xbc] = { .lshift = 0x78, .overflow = 0x01 },
 327                 [0xbd] = { .lshift = 0x7a, .overflow = 0x01 },
 328                 [0xbe] = { .lshift = 0x7c, .overflow = 0x01 },
 329                 [0xbf] = { .lshift = 0x7e, .overflow = 0x01 },
 330                 [0xc0] = { .lshift = 0x80, .overflow = 0x01 },
 331                 [0xc1] = { .lshift = 0x82, .overflow = 0x01 },
 332                 [0xc2] = { .lshift = 0x84, .overflow = 0x01 },
 333                 [0xc3] = { .lshift = 0x86, .overflow = 0x01 },
 334                 [0xc4] = { .lshift = 0x88, .overflow = 0x01 },
 335                 [0xc5] = { .lshift = 0x8a, .overflow = 0x01 },
 336                 [0xc6] = { .lshift = 0x8c, .overflow = 0x01 },
 337                 [0xc7] = { .lshift = 0x8e, .overflow = 0x01 },
 338                 [0xc8] = { .lshift = 0x90, .overflow = 0x01 },
 339                 [0xc9] = { .lshift = 0x92, .overflow = 0x01 },
 340                 [0xca] = { .lshift = 0x94, .overflow = 0x01 },
 341                 [0xcb] = { .lshift = 0x96, .overflow = 0x01 },
 342                 [0xcc] = { .lshift = 0x98, .overflow = 0x01 },
 343                 [0xcd] = { .lshift = 0x9a, .overflow = 0x01 },
 344                 [0xce] = { .lshift = 0x9c, .overflow = 0x01 },
 345                 [0xcf] = { .lshift = 0x9e, .overflow = 0x01 },
 346                 [0xd0] = { .lshift = 0xa0, .overflow = 0x01 },
 347                 [0xd1] = { .lshift = 0xa2, .overflow = 0x01 },
 348                 [0xd2] = { .lshift = 0xa4, .overflow = 0x01 },
 349                 [0xd3] = { .lshift = 0xa6, .overflow = 0x01 },
 350                 [0xd4] = { .lshift = 0xa8, .overflow = 0x01 },
 351                 [0xd5] = { .lshift = 0xaa, .overflow = 0x01 },
 352                 [0xd6] = { .lshift = 0xac, .overflow = 0x01 },
 353                 [0xd7] = { .lshift = 0xae, .overflow = 0x01 },
 354                 [0xd8] = { .lshift = 0xb0, .overflow = 0x01 },
 355                 [0xd9] = { .lshift = 0xb2, .overflow = 0x01 },
 356                 [0xda] = { .lshift = 0xb4, .overflow = 0x01 },
 357                 [0xdb] = { .lshift = 0xb6, .overflow = 0x01 },
 358                 [0xdc] = { .lshift = 0xb8, .overflow = 0x01 },
 359                 [0xdd] = { .lshift = 0xba, .overflow = 0x01 },
 360                 [0xde] = { .lshift = 0xbc, .overflow = 0x01 },
 361                 [0xdf] = { .lshift = 0xbe, .overflow = 0x01 },
 362                 [0xe0] = { .lshift = 0xc0, .overflow = 0x01 },
 363                 [0xe1] = { .lshift = 0xc2, .overflow = 0x01 },
 364                 [0xe2] = { .lshift = 0xc4, .overflow = 0x01 },
 365                 [0xe3] = { .lshift = 0xc6, .overflow = 0x01 },
 366                 [0xe4] = { .lshift = 0xc8, .overflow = 0x01 },
 367                 [0xe5] = { .lshift = 0xca, .overflow = 0x01 },
 368                 [0xe6] = { .lshift = 0xcc, .overflow = 0x01 },
 369                 [0xe7] = { .lshift = 0xce, .overflow = 0x01 },
 370                 [0xe8] = { .lshift = 0xd0, .overflow = 0x01 },
 371                 [0xe9] = { .lshift = 0xd2, .overflow = 0x01 },
 372                 [0xea] = { .lshift = 0xd4, .overflow = 0x01 },
 373                 [0xeb] = { .lshift = 0xd6, .overflow = 0x01 },
 374                 [0xec] = { .lshift = 0xd8, .overflow = 0x01 },
 375                 [0xed] = { .lshift = 0xda, .overflow = 0x01 },
 376                 [0xee] = { .lshift = 0xdc, .overflow = 0x01 },
 377                 [0xef] = { .lshift = 0xde, .overflow = 0x01 },
 378                 [0xf0] = { .lshift = 0xe0, .overflow = 0x01 },
 379                 [0xf1] = { .lshift = 0xe2, .overflow = 0x01 },
 380                 [0xf2] = { .lshift = 0xe4, .overflow = 0x01 },
 381                 [0xf3] = { .lshift = 0xe6, .overflow = 0x01 },
 382                 [0xf4] = { .lshift = 0xe8, .overflow = 0x01 },
 383                 [0xf5] = { .lshift = 0xea, .overflow = 0x01 },
 384                 [0xf6] = { .lshift = 0xec, .overflow = 0x01 },
 385                 [0xf7] = { .lshift = 0xee, .overflow = 0x01 },
 386                 [0xf8] = { .lshift = 0xf0, .overflow = 0x01 },
 387                 [0xf9] = { .lshift = 0xf2, .overflow = 0x01 },
 388                 [0xfa] = { .lshift = 0xf4, .overflow = 0x01 },
 389                 [0xfb] = { .lshift = 0xf6, .overflow = 0x01 },
 390                 [0xfc] = { .lshift = 0xf8, .overflow = 0x01 },
 391                 [0xfd] = { .lshift = 0xfa, .overflow = 0x01 },
 392                 [0xfe] = { .lshift = 0xfc, .overflow = 0x01 },
 393                 [0xff] = { .lshift = 0xfe, .overflow = 0x01 },
 394         };
 395         int8_t i;
 396         uint8_t overflow = 0;
 397
 398         for (i = AES_BLOCK_SIZE - 1; i >= 0; i--) {
 399                 const struct aes_block_lshift_entry *e = &aes_block_lshift_table[in[i]];
 400                 out[i] = e->lshift | overflow;
 401                 overflow = e->overflow;
 402         }
 403 }
 404
 405 static inline void aes_block_rshift(const uint8_t in[AES_BLOCK_SIZE],
 406                                     uint8_t out[AES_BLOCK_SIZE])
 407 {
 408         static const struct aes_block_rshift_entry {
 409                 uint8_t rshift;
 410                 uint8_t overflow;
 411         } aes_block_rshift_table[UINT8_MAX+1] = {
 412                 [0x00] = { .rshift = 0x00, .overflow = 0x00 },
 413                 [0x01] = { .rshift = 0x00, .overflow = 0x80 },
 414                 [0x02] = { .rshift = 0x01, .overflow = 0x00 },
 415                 [0x03] = { .rshift = 0x01, .overflow = 0x80 },
 416                 [0x04] = { .rshift = 0x02, .overflow = 0x00 },
 417                 [0x05] = { .rshift = 0x02, .overflow = 0x80 },
 418                 [0x06] = { .rshift = 0x03, .overflow = 0x00 },
 419                 [0x07] = { .rshift = 0x03, .overflow = 0x80 },
 420                 [0x08] = { .rshift = 0x04, .overflow = 0x00 },
 421                 [0x09] = { .rshift = 0x04, .overflow = 0x80 },
 422                 [0x0a] = { .rshift = 0x05, .overflow = 0x00 },
 423                 [0x0b] = { .rshift = 0x05, .overflow = 0x80 },
 424                 [0x0c] = { .rshift = 0x06, .overflow = 0x00 },
 425                 [0x0d] = { .rshift = 0x06, .overflow = 0x80 },
 426                 [0x0e] = { .rshift = 0x07, .overflow = 0x00 },
 427                 [0x0f] = { .rshift = 0x07, .overflow = 0x80 },
 428                 [0x10] = { .rshift = 0x08, .overflow = 0x00 },
 429                 [0x11] = { .rshift = 0x08, .overflow = 0x80 },
 430                 [0x12] = { .rshift = 0x09, .overflow = 0x00 },
 431                 [0x13] = { .rshift = 0x09, .overflow = 0x80 },
 432                 [0x14] = { .rshift = 0x0a, .overflow = 0x00 },
 433                 [0x15] = { .rshift = 0x0a, .overflow = 0x80 },
 434                 [0x16] = { .rshift = 0x0b, .overflow = 0x00 },
 435                 [0x17] = { .rshift = 0x0b, .overflow = 0x80 },
 436                 [0x18] = { .rshift = 0x0c, .overflow = 0x00 },
 437                 [0x19] = { .rshift = 0x0c, .overflow = 0x80 },
 438                 [0x1a] = { .rshift = 0x0d, .overflow = 0x00 },
 439                 [0x1b] = { .rshift = 0x0d, .overflow = 0x80 },
 440                 [0x1c] = { .rshift = 0x0e, .overflow = 0x00 },
 441                 [0x1d] = { .rshift = 0x0e, .overflow = 0x80 },
 442                 [0x1e] = { .rshift = 0x0f, .overflow = 0x00 },
 443                 [0x1f] = { .rshift = 0x0f, .overflow = 0x80 },
 444                 [0x20] = { .rshift = 0x10, .overflow = 0x00 },
 445                 [0x21] = { .rshift = 0x10, .overflow = 0x80 },
 446                 [0x22] = { .rshift = 0x11, .overflow = 0x00 },
 447                 [0x23] = { .rshift = 0x11, .overflow = 0x80 },
 448                 [0x24] = { .rshift = 0x12, .overflow = 0x00 },
 449                 [0x25] = { .rshift = 0x12, .overflow = 0x80 },
 450                 [0x26] = { .rshift = 0x13, .overflow = 0x00 },
 451                 [0x27] = { .rshift = 0x13, .overflow = 0x80 },
 452                 [0x28] = { .rshift = 0x14, .overflow = 0x00 },
 453                 [0x29] = { .rshift = 0x14, .overflow = 0x80 },
 454                 [0x2a] = { .rshift = 0x15, .overflow = 0x00 },
 455                 [0x2b] = { .rshift = 0x15, .overflow = 0x80 },
 456                 [0x2c] = { .rshift = 0x16, .overflow = 0x00 },
 457                 [0x2d] = { .rshift = 0x16, .overflow = 0x80 },
 458                 [0x2e] = { .rshift = 0x17, .overflow = 0x00 },
 459                 [0x2f] = { .rshift = 0x17, .overflow = 0x80 },
 460                 [0x30] = { .rshift = 0x18, .overflow = 0x00 },
 461                 [0x31] = { .rshift = 0x18, .overflow = 0x80 },
 462                 [0x32] = { .rshift = 0x19, .overflow = 0x00 },
 463                 [0x33] = { .rshift = 0x19, .overflow = 0x80 },
 464                 [0x34] = { .rshift = 0x1a, .overflow = 0x00 },
 465                 [0x35] = { .rshift = 0x1a, .overflow = 0x80 },
 466                 [0x36] = { .rshift = 0x1b, .overflow = 0x00 },
 467                 [0x37] = { .rshift = 0x1b, .overflow = 0x80 },
 468                 [0x38] = { .rshift = 0x1c, .overflow = 0x00 },
 469                 [0x39] = { .rshift = 0x1c, .overflow = 0x80 },
 470                 [0x3a] = { .rshift = 0x1d, .overflow = 0x00 },
 471                 [0x3b] = { .rshift = 0x1d, .overflow = 0x80 },
 472                 [0x3c] = { .rshift = 0x1e, .overflow = 0x00 },
 473                 [0x3d] = { .rshift = 0x1e, .overflow = 0x80 },
 474                 [0x3e] = { .rshift = 0x1f, .overflow = 0x00 },
 475                 [0x3f] = { .rshift = 0x1f, .overflow = 0x80 },
 476                 [0x40] = { .rshift = 0x20, .overflow = 0x00 },
 477                 [0x41] = { .rshift = 0x20, .overflow = 0x80 },
 478                 [0x42] = { .rshift = 0x21, .overflow = 0x00 },
 479                 [0x43] = { .rshift = 0x21, .overflow = 0x80 },
 480                 [0x44] = { .rshift = 0x22, .overflow = 0x00 },
 481                 [0x45] = { .rshift = 0x22, .overflow = 0x80 },
 482                 [0x46] = { .rshift = 0x23, .overflow = 0x00 },
 483                 [0x47] = { .rshift = 0x23, .overflow = 0x80 },
 484                 [0x48] = { .rshift = 0x24, .overflow = 0x00 },
 485                 [0x49] = { .rshift = 0x24, .overflow = 0x80 },
 486                 [0x4a] = { .rshift = 0x25, .overflow = 0x00 },
 487                 [0x4b] = { .rshift = 0x25, .overflow = 0x80 },
 488                 [0x4c] = { .rshift = 0x26, .overflow = 0x00 },
 489                 [0x4d] = { .rshift = 0x26, .overflow = 0x80 },
 490                 [0x4e] = { .rshift = 0x27, .overflow = 0x00 },
 491                 [0x4f] = { .rshift = 0x27, .overflow = 0x80 },
 492                 [0x50] = { .rshift = 0x28, .overflow = 0x00 },
 493                 [0x51] = { .rshift = 0x28, .overflow = 0x80 },
 494                 [0x52] = { .rshift = 0x29, .overflow = 0x00 },
 495                 [0x53] = { .rshift = 0x29, .overflow = 0x80 },
 496                 [0x54] = { .rshift = 0x2a, .overflow = 0x00 },
 497                 [0x55] = { .rshift = 0x2a, .overflow = 0x80 },
 498                 [0x56] = { .rshift = 0x2b, .overflow = 0x00 },
 499                 [0x57] = { .rshift = 0x2b, .overflow = 0x80 },
 500                 [0x58] = { .rshift = 0x2c, .overflow = 0x00 },
 501                 [0x59] = { .rshift = 0x2c, .overflow = 0x80 },
 502                 [0x5a] = { .rshift = 0x2d, .overflow = 0x00 },
 503                 [0x5b] = { .rshift = 0x2d, .overflow = 0x80 },
 504                 [0x5c] = { .rshift = 0x2e, .overflow = 0x00 },
 505                 [0x5d] = { .rshift = 0x2e, .overflow = 0x80 },
 506                 [0x5e] = { .rshift = 0x2f, .overflow = 0x00 },
 507                 [0x5f] = { .rshift = 0x2f, .overflow = 0x80 },
 508                 [0x60] = { .rshift = 0x30, .overflow = 0x00 },
 509                 [0x61] = { .rshift = 0x30, .overflow = 0x80 },
 510                 [0x62] = { .rshift = 0x31, .overflow = 0x00 },
 511                 [0x63] = { .rshift = 0x31, .overflow = 0x80 },
 512                 [0x64] = { .rshift = 0x32, .overflow = 0x00 },
 513                 [0x65] = { .rshift = 0x32, .overflow = 0x80 },
 514                 [0x66] = { .rshift = 0x33, .overflow = 0x00 },
 515                 [0x67] = { .rshift = 0x33, .overflow = 0x80 },
 516                 [0x68] = { .rshift = 0x34, .overflow = 0x00 },
 517                 [0x69] = { .rshift = 0x34, .overflow = 0x80 },
 518                 [0x6a] = { .rshift = 0x35, .overflow = 0x00 },
 519                 [0x6b] = { .rshift = 0x35, .overflow = 0x80 },
 520                 [0x6c] = { .rshift = 0x36, .overflow = 0x00 },
 521                 [0x6d] = { .rshift = 0x36, .overflow = 0x80 },
 522                 [0x6e] = { .rshift = 0x37, .overflow = 0x00 },
 523                 [0x6f] = { .rshift = 0x37, .overflow = 0x80 },
 524                 [0x70] = { .rshift = 0x38, .overflow = 0x00 },
 525                 [0x71] = { .rshift = 0x38, .overflow = 0x80 },
 526                 [0x72] = { .rshift = 0x39, .overflow = 0x00 },
 527                 [0x73] = { .rshift = 0x39, .overflow = 0x80 },
 528                 [0x74] = { .rshift = 0x3a, .overflow = 0x00 },
 529                 [0x75] = { .rshift = 0x3a, .overflow = 0x80 },
 530                 [0x76] = { .rshift = 0x3b, .overflow = 0x00 },
 531                 [0x77] = { .rshift = 0x3b, .overflow = 0x80 },
 532                 [0x78] = { .rshift = 0x3c, .overflow = 0x00 },
 533                 [0x79] = { .rshift = 0x3c, .overflow = 0x80 },
 534                 [0x7a] = { .rshift = 0x3d, .overflow = 0x00 },
 535                 [0x7b] = { .rshift = 0x3d, .overflow = 0x80 },
 536                 [0x7c] = { .rshift = 0x3e, .overflow = 0x00 },
 537                 [0x7d] = { .rshift = 0x3e, .overflow = 0x80 },
 538                 [0x7e] = { .rshift = 0x3f, .overflow = 0x00 },
 539                 [0x7f] = { .rshift = 0x3f, .overflow = 0x80 },
 540                 [0x80] = { .rshift = 0x40, .overflow = 0x00 },
 541                 [0x81] = { .rshift = 0x40, .overflow = 0x80 },
 542                 [0x82] = { .rshift = 0x41, .overflow = 0x00 },
 543                 [0x83] = { .rshift = 0x41, .overflow = 0x80 },
 544                 [0x84] = { .rshift = 0x42, .overflow = 0x00 },
 545                 [0x85] = { .rshift = 0x42, .overflow = 0x80 },
 546                 [0x86] = { .rshift = 0x43, .overflow = 0x00 },
 547                 [0x87] = { .rshift = 0x43, .overflow = 0x80 },
 548                 [0x88] = { .rshift = 0x44, .overflow = 0x00 },
 549                 [0x89] = { .rshift = 0x44, .overflow = 0x80 },
 550                 [0x8a] = { .rshift = 0x45, .overflow = 0x00 },
 551                 [0x8b] = { .rshift = 0x45, .overflow = 0x80 },
 552                 [0x8c] = { .rshift = 0x46, .overflow = 0x00 },
 553                 [0x8d] = { .rshift = 0x46, .overflow = 0x80 },
 554                 [0x8e] = { .rshift = 0x47, .overflow = 0x00 },
 555                 [0x8f] = { .rshift = 0x47, .overflow = 0x80 },
 556                 [0x90] = { .rshift = 0x48, .overflow = 0x00 },
 557                 [0x91] = { .rshift = 0x48, .overflow = 0x80 },
 558                 [0x92] = { .rshift = 0x49, .overflow = 0x00 },
 559                 [0x93] = { .rshift = 0x49, .overflow = 0x80 },
 560                 [0x94] = { .rshift = 0x4a, .overflow = 0x00 },
 561                 [0x95] = { .rshift = 0x4a, .overflow = 0x80 },
 562                 [0x96] = { .rshift = 0x4b, .overflow = 0x00 },
 563                 [0x97] = { .rshift = 0x4b, .overflow = 0x80 },
 564                 [0x98] = { .rshift = 0x4c, .overflow = 0x00 },
 565                 [0x99] = { .rshift = 0x4c, .overflow = 0x80 },
 566                 [0x9a] = { .rshift = 0x4d, .overflow = 0x00 },
 567                 [0x9b] = { .rshift = 0x4d, .overflow = 0x80 },
 568                 [0x9c] = { .rshift = 0x4e, .overflow = 0x00 },
 569                 [0x9d] = { .rshift = 0x4e, .overflow = 0x80 },
 570                 [0x9e] = { .rshift = 0x4f, .overflow = 0x00 },
 571                 [0x9f] = { .rshift = 0x4f, .overflow = 0x80 },
 572                 [0xa0] = { .rshift = 0x50, .overflow = 0x00 },
 573                 [0xa1] = { .rshift = 0x50, .overflow = 0x80 },
 574                 [0xa2] = { .rshift = 0x51, .overflow = 0x00 },
 575                 [0xa3] = { .rshift = 0x51, .overflow = 0x80 },
 576                 [0xa4] = { .rshift = 0x52, .overflow = 0x00 },
 577                 [0xa5] = { .rshift = 0x52, .overflow = 0x80 },
 578                 [0xa6] = { .rshift = 0x53, .overflow = 0x00 },
 579                 [0xa7] = { .rshift = 0x53, .overflow = 0x80 },
 580                 [0xa8] = { .rshift = 0x54, .overflow = 0x00 },
 581                 [0xa9] = { .rshift = 0x54, .overflow = 0x80 },
 582                 [0xaa] = { .rshift = 0x55, .overflow = 0x00 },
 583                 [0xab] = { .rshift = 0x55, .overflow = 0x80 },
 584                 [0xac] = { .rshift = 0x56, .overflow = 0x00 },
 585                 [0xad] = { .rshift = 0x56, .overflow = 0x80 },
 586                 [0xae] = { .rshift = 0x57, .overflow = 0x00 },
 587                 [0xaf] = { .rshift = 0x57, .overflow = 0x80 },
 588                 [0xb0] = { .rshift = 0x58, .overflow = 0x00 },
 589                 [0xb1] = { .rshift = 0x58, .overflow = 0x80 },
 590                 [0xb2] = { .rshift = 0x59, .overflow = 0x00 },
 591                 [0xb3] = { .rshift = 0x59, .overflow = 0x80 },
 592                 [0xb4] = { .rshift = 0x5a, .overflow = 0x00 },
 593                 [0xb5] = { .rshift = 0x5a, .overflow = 0x80 },
 594                 [0xb6] = { .rshift = 0x5b, .overflow = 0x00 },
 595                 [0xb7] = { .rshift = 0x5b, .overflow = 0x80 },
 596                 [0xb8] = { .rshift = 0x5c, .overflow = 0x00 },
 597                 [0xb9] = { .rshift = 0x5c, .overflow = 0x80 },
 598                 [0xba] = { .rshift = 0x5d, .overflow = 0x00 },
 599                 [0xbb] = { .rshift = 0x5d, .overflow = 0x80 },
 600                 [0xbc] = { .rshift = 0x5e, .overflow = 0x00 },
 601                 [0xbd] = { .rshift = 0x5e, .overflow = 0x80 },
 602                 [0xbe] = { .rshift = 0x5f, .overflow = 0x00 },
 603                 [0xbf] = { .rshift = 0x5f, .overflow = 0x80 },
 604                 [0xc0] = { .rshift = 0x60, .overflow = 0x00 },
 605                 [0xc1] = { .rshift = 0x60, .overflow = 0x80 },
 606                 [0xc2] = { .rshift = 0x61, .overflow = 0x00 },
 607                 [0xc3] = { .rshift = 0x61, .overflow = 0x80 },
 608                 [0xc4] = { .rshift = 0x62, .overflow = 0x00 },
 609                 [0xc5] = { .rshift = 0x62, .overflow = 0x80 },
 610                 [0xc6] = { .rshift = 0x63, .overflow = 0x00 },
 611                 [0xc7] = { .rshift = 0x63, .overflow = 0x80 },
 612                 [0xc8] = { .rshift = 0x64, .overflow = 0x00 },
 613                 [0xc9] = { .rshift = 0x64, .overflow = 0x80 },
 614                 [0xca] = { .rshift = 0x65, .overflow = 0x00 },
 615                 [0xcb] = { .rshift = 0x65, .overflow = 0x80 },
 616                 [0xcc] = { .rshift = 0x66, .overflow = 0x00 },
 617                 [0xcd] = { .rshift = 0x66, .overflow = 0x80 },
 618                 [0xce] = { .rshift = 0x67, .overflow = 0x00 },
 619                 [0xcf] = { .rshift = 0x67, .overflow = 0x80 },
 620                 [0xd0] = { .rshift = 0x68, .overflow = 0x00 },
 621                 [0xd1] = { .rshift = 0x68, .overflow = 0x80 },
 622                 [0xd2] = { .rshift = 0x69, .overflow = 0x00 },
 623                 [0xd3] = { .rshift = 0x69, .overflow = 0x80 },
 624                 [0xd4] = { .rshift = 0x6a, .overflow = 0x00 },
 625                 [0xd5] = { .rshift = 0x6a, .overflow = 0x80 },
 626                 [0xd6] = { .rshift = 0x6b, .overflow = 0x00 },
 627                 [0xd7] = { .rshift = 0x6b, .overflow = 0x80 },
 628                 [0xd8] = { .rshift = 0x6c, .overflow = 0x00 },
 629                 [0xd9] = { .rshift = 0x6c, .overflow = 0x80 },
 630                 [0xda] = { .rshift = 0x6d, .overflow = 0x00 },
 631                 [0xdb] = { .rshift = 0x6d, .overflow = 0x80 },
 632                 [0xdc] = { .rshift = 0x6e, .overflow = 0x00 },
 633                 [0xdd] = { .rshift = 0x6e, .overflow = 0x80 },
 634                 [0xde] = { .rshift = 0x6f, .overflow = 0x00 },
 635                 [0xdf] = { .rshift = 0x6f, .overflow = 0x80 },
 636                 [0xe0] = { .rshift = 0x70, .overflow = 0x00 },
 637                 [0xe1] = { .rshift = 0x70, .overflow = 0x80 },
 638                 [0xe2] = { .rshift = 0x71, .overflow = 0x00 },
 639                 [0xe3] = { .rshift = 0x71, .overflow = 0x80 },
 640                 [0xe4] = { .rshift = 0x72, .overflow = 0x00 },
 641                 [0xe5] = { .rshift = 0x72, .overflow = 0x80 },
 642                 [0xe6] = { .rshift = 0x73, .overflow = 0x00 },
 643                 [0xe7] = { .rshift = 0x73, .overflow = 0x80 },
 644                 [0xe8] = { .rshift = 0x74, .overflow = 0x00 },
 645                 [0xe9] = { .rshift = 0x74, .overflow = 0x80 },
 646                 [0xea] = { .rshift = 0x75, .overflow = 0x00 },
 647                 [0xeb] = { .rshift = 0x75, .overflow = 0x80 },
 648                 [0xec] = { .rshift = 0x76, .overflow = 0x00 },
 649                 [0xed] = { .rshift = 0x76, .overflow = 0x80 },
 650                 [0xee] = { .rshift = 0x77, .overflow = 0x00 },
 651                 [0xef] = { .rshift = 0x77, .overflow = 0x80 },
 652                 [0xf0] = { .rshift = 0x78, .overflow = 0x00 },
 653                 [0xf1] = { .rshift = 0x78, .overflow = 0x80 },
 654                 [0xf2] = { .rshift = 0x79, .overflow = 0x00 },
 655                 [0xf3] = { .rshift = 0x79, .overflow = 0x80 },
 656                 [0xf4] = { .rshift = 0x7a, .overflow = 0x00 },
 657                 [0xf5] = { .rshift = 0x7a, .overflow = 0x80 },
 658                 [0xf6] = { .rshift = 0x7b, .overflow = 0x00 },
 659                 [0xf7] = { .rshift = 0x7b, .overflow = 0x80 },
 660                 [0xf8] = { .rshift = 0x7c, .overflow = 0x00 },
 661                 [0xf9] = { .rshift = 0x7c, .overflow = 0x80 },
 662                 [0xfa] = { .rshift = 0x7d, .overflow = 0x00 },
 663                 [0xfb] = { .rshift = 0x7d, .overflow = 0x80 },
 664                 [0xfc] = { .rshift = 0x7e, .overflow = 0x00 },
 665                 [0xfd] = { .rshift = 0x7e, .overflow = 0x80 },
 666                 [0xfe] = { .rshift = 0x7f, .overflow = 0x00 },
 667                 [0xff] = { .rshift = 0x7f, .overflow = 0x80 },
 668         };
 669         uint8_t i;
 670         uint8_t overflow = 0;
 671
 672         for (i = 0; i < AES_BLOCK_SIZE; i++) {
 673                 const struct aes_block_rshift_entry *e = &aes_block_rshift_table[in[i]];
 674                 out[i] = e->rshift | overflow;
 675                 overflow = e->overflow;
 676         }
 677 }
 678 #endif /* LIB_CRYPTO_AES_H */