sys/crypto/rijndael/rijndael-api-fst.c

   1 /*      $FreeBSD: src/sys/crypto/rijndael/rijndael-api-fst.c,v 1.12 2005/03/11 16:26:10 ume Exp $       */
   2 /*      $KAME: rijndael-api-fst.c,v 1.10 2001/05/27 09:34:18 itojun Exp $       */
   3
   4 /*
   5  * rijndael-api-fst.c   v2.3   April '2000
   6  *
   7  * Optimised ANSI C code
   8  *
   9  * authors: v1.0: Antoon Bosselaers
  10  *          v2.0: Vincent Rijmen
  11  *          v2.1: Vincent Rijmen
  12  *          v2.2: Vincent Rijmen
  13  *          v2.3: Paulo Barreto
  14  *          v2.4: Vincent Rijmen
  15  *
  16  * This code is placed in the public domain.
  17  */
  18
  19 #include <sys/param.h>
  20 #ifdef _KERNEL
  21 #include <sys/systm.h>
  22 #else
  23 #include <string.h>
  24 #endif
  25
  26 #include <crypto/rijndael/rijndael_local.h>
  27 #include <crypto/rijndael/rijndael-api-fst.h>
  28
  29 #ifndef TRUE
  30 #define TRUE 1
  31 #endif
  32
  33 typedef u_int8_t        BYTE;
  34
  35 int rijndael_makeKey(keyInstance *key, BYTE direction, int keyLen, char *keyMaterial) {
  36         u_int8_t cipherKey[RIJNDAEL_MAXKB];
  37
  38         if (key == NULL) {
  39                 return BAD_KEY_INSTANCE;
  40         }
  41
  42         if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
  43                 key->direction = direction;
  44         } else {
  45                 return BAD_KEY_DIR;
  46         }
  47
  48         if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
  49                 key->keyLen = keyLen;
  50         } else {
  51                 return BAD_KEY_MAT;
  52         }
  53
  54         if (keyMaterial != NULL) {
  55                 memcpy(key->keyMaterial, keyMaterial, keyLen/8);
  56         }
  57
  58         /* initialize key schedule: */
  59         memcpy(cipherKey, key->keyMaterial, keyLen/8);
  60         if (direction == DIR_ENCRYPT) {
  61                 key->Nr = rijndaelKeySetupEnc(key->rk, cipherKey, keyLen);
  62         } else {
  63                 key->Nr = rijndaelKeySetupDec(key->rk, cipherKey, keyLen);
  64         }
  65         rijndaelKeySetupEnc(key->ek, cipherKey, keyLen);
  66         return TRUE;
  67 }
  68
  69 int rijndael_cipherInit(cipherInstance *cipher, BYTE mode, char *IV) {
  70         if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
  71                 cipher->mode = mode;
  72         } else {
  73                 return BAD_CIPHER_MODE;
  74         }
  75         if (IV != NULL) {
  76                 memcpy(cipher->IV, IV, RIJNDAEL_MAX_IV_SIZE);
  77         } else {
  78                 memset(cipher->IV, 0, RIJNDAEL_MAX_IV_SIZE);
  79         }
  80         return TRUE;
  81 }
  82
  83 int rijndael_blockEncrypt(cipherInstance *cipher, keyInstance *key,
  84                 BYTE *input, int inputLen, BYTE *outBuffer) {
  85         int i, k, numBlocks;
  86         u_int8_t block[16], iv[4][4];
  87
  88         if (cipher == NULL ||
  89                 key == NULL ||
  90                 key->direction == DIR_DECRYPT) {
  91                 return BAD_CIPHER_STATE;
  92         }
  93         if (input == NULL || inputLen <= 0) {
  94                 return 0; /* nothing to do */
  95         }
  96
  97         numBlocks = inputLen/128;
  98
  99         switch (cipher->mode) {
 100         case MODE_ECB:
 101                 for (i = numBlocks; i > 0; i--) {
 102                         rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
 103                         input += 16;
 104                         outBuffer += 16;
 105                 }
 106                 break;
 107
 108         case MODE_CBC:
 109 #if 1 /*STRICT_ALIGN*/
 110                 memcpy(block, cipher->IV, 16);
 111                 memcpy(iv, input, 16);
 112                 ((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
 113                 ((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
 114                 ((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
 115                 ((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
 116 #else
 117                 ((u_int32_t*)block)[0] = ((u_int32_t*)cipher->IV)[0] ^ ((u_int32_t*)input)[0];
 118                 ((u_int32_t*)block)[1] = ((u_int32_t*)cipher->IV)[1] ^ ((u_int32_t*)input)[1];
 119                 ((u_int32_t*)block)[2] = ((u_int32_t*)cipher->IV)[2] ^ ((u_int32_t*)input)[2];
 120                 ((u_int32_t*)block)[3] = ((u_int32_t*)cipher->IV)[3] ^ ((u_int32_t*)input)[3];
 121 #endif
 122                 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
 123                 input += 16;
 124                 for (i = numBlocks - 1; i > 0; i--) {
 125 #if 1 /*STRICT_ALIGN*/
 126                         memcpy(block, outBuffer, 16);
 127                         memcpy(iv, input, 16);
 128                         ((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
 129                         ((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
 130                         ((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
 131                         ((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
 132 #else
 133                         ((u_int32_t*)block)[0] = ((u_int32_t*)outBuffer)[0] ^ ((u_int32_t*)input)[0];
 134                         ((u_int32_t*)block)[1] = ((u_int32_t*)outBuffer)[1] ^ ((u_int32_t*)input)[1];
 135                         ((u_int32_t*)block)[2] = ((u_int32_t*)outBuffer)[2] ^ ((u_int32_t*)input)[2];
 136                         ((u_int32_t*)block)[3] = ((u_int32_t*)outBuffer)[3] ^ ((u_int32_t*)input)[3];
 137 #endif
 138                         outBuffer += 16;
 139                         rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
 140                         input += 16;
 141                 }
 142                 break;
 143
 144         case MODE_CFB1:
 145 #if 1 /*STRICT_ALIGN*/
 146                 memcpy(iv, cipher->IV, 16);
 147 #else  /* !STRICT_ALIGN */
 148                 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV   ));
 149                 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
 150                 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
 151                 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
 152 #endif /* ?STRICT_ALIGN */
 153                 for (i = numBlocks; i > 0; i--) {
 154                         for (k = 0; k < 128; k++) {
 155                                 *((u_int32_t*) block    ) = *((u_int32_t*)iv[0]);
 156                                 *((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
 157                                 *((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
 158                                 *((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
 159                                 rijndaelEncrypt(key->ek, key->Nr, block,
 160                                     block);
 161                                 outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
 162                                 iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
 163                                 iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
 164                                 iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
 165                                 iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
 166                                 iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
 167                                 iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
 168                                 iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
 169                                 iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
 170                                 iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
 171                                 iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
 172                                 iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
 173                                 iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
 174                                 iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
 175                                 iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
 176                                 iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
 177                                 iv[3][3] = (iv[3][3] << 1) | ((outBuffer[k/8] >> (7-(k&7))) & 1);
 178                         }
 179                 }
 180                 break;
 181
 182         default:
 183                 return BAD_CIPHER_STATE;
 184         }
 185
 186         return 128*numBlocks;
 187 }
 188
 189 /**
 190  * Encrypt data partitioned in octets, using RFC 2040-like padding.
 191  *
 192  * @param   input           data to be encrypted (octet sequence)
 193  * @param   inputOctets         input length in octets (not bits)
 194  * @param   outBuffer       encrypted output data
 195  *
 196  * @return      length in octets (not bits) of the encrypted output buffer.
 197  */
 198 int rijndael_padEncrypt(cipherInstance *cipher, keyInstance *key,
 199                 BYTE *input, int inputOctets, BYTE *outBuffer) {
 200         int i, numBlocks, padLen;
 201         u_int8_t block[16], *iv, *cp;
 202
 203         if (cipher == NULL ||
 204                 key == NULL ||
 205                 key->direction == DIR_DECRYPT) {
 206                 return BAD_CIPHER_STATE;
 207         }
 208         if (input == NULL || inputOctets <= 0) {
 209                 return 0; /* nothing to do */
 210         }
 211
 212         numBlocks = inputOctets/16;
 213
 214         switch (cipher->mode) {
 215         case MODE_ECB:
 216                 for (i = numBlocks; i > 0; i--) {
 217                         rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
 218                         input += 16;
 219                         outBuffer += 16;
 220                 }
 221                 padLen = 16 - (inputOctets - 16*numBlocks);
 222                 if (padLen <= 0 || padLen > 16)
 223                         return BAD_CIPHER_STATE;
 224                 memcpy(block, input, 16 - padLen);
 225                 for (cp = block + 16 - padLen; cp < block + 16; cp++)
 226                         *cp = padLen;
 227                 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
 228                 break;
 229
 230         case MODE_CBC:
 231                 iv = cipher->IV;
 232                 for (i = numBlocks; i > 0; i--) {
 233                         ((u_int32_t*)block)[0] = ((u_int32_t*)input)[0] ^ ((u_int32_t*)iv)[0];
 234                         ((u_int32_t*)block)[1] = ((u_int32_t*)input)[1] ^ ((u_int32_t*)iv)[1];
 235                         ((u_int32_t*)block)[2] = ((u_int32_t*)input)[2] ^ ((u_int32_t*)iv)[2];
 236                         ((u_int32_t*)block)[3] = ((u_int32_t*)input)[3] ^ ((u_int32_t*)iv)[3];
 237                         rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
 238                         iv = outBuffer;
 239                         input += 16;
 240                         outBuffer += 16;
 241                 }
 242                 padLen = 16 - (inputOctets - 16*numBlocks);
 243                 if (padLen <= 0 || padLen > 16)
 244                         return BAD_CIPHER_STATE;
 245                 for (i = 0; i < 16 - padLen; i++) {
 246                         block[i] = input[i] ^ iv[i];
 247                 }
 248                 for (i = 16 - padLen; i < 16; i++) {
 249                         block[i] = (BYTE)padLen ^ iv[i];
 250                 }
 251                 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
 252                 break;
 253
 254         default:
 255                 return BAD_CIPHER_STATE;
 256         }
 257
 258         return 16*(numBlocks + 1);
 259 }
 260
 261 int rijndael_blockDecrypt(cipherInstance *cipher, keyInstance *key,
 262                 BYTE *input, int inputLen, BYTE *outBuffer) {
 263         int i, k, numBlocks;
 264         u_int8_t block[16], iv[4][4];
 265
 266         if (cipher == NULL ||
 267                 key == NULL ||
 268                 (cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT)) {
 269                 return BAD_CIPHER_STATE;
 270         }
 271         if (input == NULL || inputLen <= 0) {
 272                 return 0; /* nothing to do */
 273         }
 274
 275         numBlocks = inputLen/128;
 276
 277         switch (cipher->mode) {
 278         case MODE_ECB:
 279                 for (i = numBlocks; i > 0; i--) {
 280                         rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
 281                         input += 16;
 282                         outBuffer += 16;
 283                 }
 284                 break;
 285
 286         case MODE_CBC:
 287 #if 1 /*STRICT_ALIGN */
 288                 memcpy(iv, cipher->IV, 16);
 289 #else
 290                 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV   ));
 291                 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
 292                 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
 293                 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
 294 #endif
 295                 for (i = numBlocks; i > 0; i--) {
 296                         rijndaelDecrypt(key->rk, key->Nr, input, block);
 297                         ((u_int32_t*)block)[0] ^= *((u_int32_t*)iv[0]);
 298                         ((u_int32_t*)block)[1] ^= *((u_int32_t*)iv[1]);
 299                         ((u_int32_t*)block)[2] ^= *((u_int32_t*)iv[2]);
 300                         ((u_int32_t*)block)[3] ^= *((u_int32_t*)iv[3]);
 301 #if 1 /*STRICT_ALIGN*/
 302                         memcpy(iv, input, 16);
 303                         memcpy(outBuffer, block, 16);
 304 #else
 305                         *((u_int32_t*)iv[0]) = ((u_int32_t*)input)[0]; ((u_int32_t*)outBuffer)[0] = ((u_int32_t*)block)[0];
 306                         *((u_int32_t*)iv[1]) = ((u_int32_t*)input)[1]; ((u_int32_t*)outBuffer)[1] = ((u_int32_t*)block)[1];
 307                         *((u_int32_t*)iv[2]) = ((u_int32_t*)input)[2]; ((u_int32_t*)outBuffer)[2] = ((u_int32_t*)block)[2];
 308                         *((u_int32_t*)iv[3]) = ((u_int32_t*)input)[3]; ((u_int32_t*)outBuffer)[3] = ((u_int32_t*)block)[3];
 309 #endif
 310                         input += 16;
 311                         outBuffer += 16;
 312                 }
 313                 break;
 314
 315         case MODE_CFB1:
 316 #if 1 /*STRICT_ALIGN */
 317                 memcpy(iv, cipher->IV, 16);
 318 #else
 319                 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV));
 320                 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
 321                 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
 322                 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
 323 #endif
 324                 for (i = numBlocks; i > 0; i--) {
 325                         for (k = 0; k < 128; k++) {
 326                                 *((u_int32_t*) block    ) = *((u_int32_t*)iv[0]);
 327                                 *((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
 328                                 *((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
 329                                 *((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
 330                                 rijndaelEncrypt(key->ek, key->Nr, block,
 331                                     block);
 332                                 iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
 333                                 iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
 334                                 iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
 335                                 iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
 336                                 iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
 337                                 iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
 338                                 iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
 339                                 iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
 340                                 iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
 341                                 iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
 342                                 iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
 343                                 iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
 344                                 iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
 345                                 iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
 346                                 iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
 347                                 iv[3][3] = (iv[3][3] << 1) | ((input[k/8] >> (7-(k&7))) & 1);
 348                                 outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
 349                         }
 350                 }
 351                 break;
 352
 353         default:
 354                 return BAD_CIPHER_STATE;
 355         }
 356
 357         return 128*numBlocks;
 358 }
 359
 360 int rijndael_padDecrypt(cipherInstance *cipher, keyInstance *key,
 361                 BYTE *input, int inputOctets, BYTE *outBuffer) {
 362         int i, numBlocks, padLen;
 363         u_int8_t block[16];
 364         u_int32_t iv[4];
 365
 366         if (cipher == NULL ||
 367                 key == NULL ||
 368                 key->direction == DIR_ENCRYPT) {
 369                 return BAD_CIPHER_STATE;
 370         }
 371         if (input == NULL || inputOctets <= 0) {
 372                 return 0; /* nothing to do */
 373         }
 374         if (inputOctets % 16 != 0) {
 375                 return BAD_DATA;
 376         }
 377
 378         numBlocks = inputOctets/16;
 379
 380         switch (cipher->mode) {
 381         case MODE_ECB:
 382                 /* all blocks but last */
 383                 for (i = numBlocks - 1; i > 0; i--) {
 384                         rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
 385                         input += 16;
 386                         outBuffer += 16;
 387                 }
 388                 /* last block */
 389                 rijndaelDecrypt(key->rk, key->Nr, input, block);
 390                 padLen = block[15];
 391                 if (padLen >= 16) {
 392                         return BAD_DATA;
 393                 }
 394                 for (i = 16 - padLen; i < 16; i++) {
 395                         if (block[i] != padLen) {
 396                                 return BAD_DATA;
 397                         }
 398                 }
 399                 memcpy(outBuffer, block, 16 - padLen);
 400                 break;
 401
 402         case MODE_CBC:
 403                 memcpy(iv, cipher->IV, 16);
 404                 /* all blocks but last */
 405                 for (i = numBlocks - 1; i > 0; i--) {
 406                         rijndaelDecrypt(key->rk, key->Nr, input, block);
 407                         ((u_int32_t*)block)[0] ^= iv[0];
 408                         ((u_int32_t*)block)[1] ^= iv[1];
 409                         ((u_int32_t*)block)[2] ^= iv[2];
 410                         ((u_int32_t*)block)[3] ^= iv[3];
 411                         memcpy(iv, input, 16);
 412                         memcpy(outBuffer, block, 16);
 413                         input += 16;
 414                         outBuffer += 16;
 415                 }
 416                 /* last block */
 417                 rijndaelDecrypt(key->rk, key->Nr, input, block);
 418                 ((u_int32_t*)block)[0] ^= iv[0];
 419                 ((u_int32_t*)block)[1] ^= iv[1];
 420                 ((u_int32_t*)block)[2] ^= iv[2];
 421                 ((u_int32_t*)block)[3] ^= iv[3];
 422                 padLen = block[15];
 423                 if (padLen <= 0 || padLen > 16) {
 424                         return BAD_DATA;
 425                 }
 426                 for (i = 16 - padLen; i < 16; i++) {
 427                         if (block[i] != padLen) {
 428                                 return BAD_DATA;
 429                         }
 430                 }
 431                 memcpy(outBuffer, block, 16 - padLen);
 432                 break;
 433
 434         default:
 435                 return BAD_CIPHER_STATE;
 436         }
 437
 438         return 16*numBlocks - padLen;
 439 }