projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 9bccf70c A |
1 | /* $FreeBSD: src/sys/crypto/rijndael/rijndael-api-fst.c,v 1.2.2.1 2001/07/03 11:01:35 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 | #include <sys/types.h> | |
| 21 | #ifdef KERNEL | |
| 22 | #include <sys/systm.h> | |
| 23 | #else | |
| 24 | #include <string.h> | |
| 25 | #endif | |
| 26 | #include <crypto/rijndael/rijndael-alg-fst.h> | |
| 27 | #include <crypto/rijndael/rijndael-api-fst.h> | |
| 28 | #include <crypto/rijndael/rijndael_local.h> | |
| 29 | ||
| 30 | int rijndael_makeKey(keyInstance *key, BYTE direction, int keyLen, char *keyMaterial) { | |
| 31 | word8 k[MAXKC][4]; | |
| 32 | int i; | |
| 33 | char *keyMat; | |
| 34 | ||
| 35 | if (key == NULL) { | |
| 36 | return BAD_KEY_INSTANCE; | |
| 37 | } | |
| 38 | ||
| 39 | if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) { | |
| 40 | key->direction = direction; | |
| 41 | } else { | |
| 42 | return BAD_KEY_DIR; | |
| 43 | } | |
| 44 | ||
| 45 | if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) { | |
| 46 | key->keyLen = keyLen; | |
| 47 | } else { | |
| 48 | return BAD_KEY_MAT; | |
| 49 | } | |
| 50 | ||
| 51 | if (keyMaterial != NULL) { | |
| 52 | bcopy(keyMaterial, key->keyMaterial, keyLen/8); | |
| 53 | } | |
| 54 | ||
| 55 | key->ROUNDS = keyLen/32 + 6; | |
| 56 | ||
| 57 | /* initialize key schedule: */ | |
| 58 | keyMat = key->keyMaterial; | |
| 59 | for (i = 0; i < key->keyLen/8; i++) { | |
| 60 | k[i >> 2][i & 3] = (word8)keyMat[i]; | |
| 61 | } | |
| 62 | rijndaelKeySched(k, key->keySched, key->ROUNDS); | |
| 63 | if (direction == DIR_DECRYPT) { | |
| 64 | rijndaelKeyEncToDec(key->keySched, key->ROUNDS); | |
| 65 | } | |
| 66 | ||
| 67 | return TRUE; | |
| 68 | } | |
| 69 | ||
| 70 | int rijndael_cipherInit(cipherInstance *cipher, BYTE mode, char *IV) { | |
| 71 | if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) { | |
| 72 | cipher->mode = mode; | |
| 73 | } else { | |
| 74 | return BAD_CIPHER_MODE; | |
| 75 | } | |
| 76 | if (IV != NULL) { | |
| 77 | bcopy(IV, cipher->IV, MAX_IV_SIZE); | |
| 78 | } else { | |
| 79 | bzero(cipher->IV, MAX_IV_SIZE); | |
| 80 | } | |
| 81 | return TRUE; | |
| 82 | } | |
| 83 | ||
| 84 | int rijndael_blockEncrypt(cipherInstance *cipher, keyInstance *key, | |
| 85 | BYTE *input, int inputLen, BYTE *outBuffer) { | |
| 86 | int i, k, numBlocks; | |
| 87 | word8 block[16], iv[4][4]; | |
| 88 | ||
| 89 | if (cipher == NULL || | |
| 90 | key == NULL || | |
| 91 | key->direction == DIR_DECRYPT) { | |
| 92 | return BAD_CIPHER_STATE; | |
| 93 | } | |
| 94 | if (input == NULL || inputLen <= 0) { | |
| 95 | return 0; /* nothing to do */ | |
| 96 | } | |
| 97 | ||
| 98 | numBlocks = inputLen/128; | |
| 99 | ||
| 100 | switch (cipher->mode) { | |
| 101 | case MODE_ECB: | |
| 102 | for (i = numBlocks; i > 0; i--) { | |
| 103 | rijndaelEncrypt(input, outBuffer, key->keySched, key->ROUNDS); | |
| 104 | input += 16; | |
| 105 | outBuffer += 16; | |
| 106 | } | |
| 107 | break; | |
| 108 | ||
| 109 | case MODE_CBC: | |
| 110 | #if 1 /*STRICT_ALIGN*/ | |
| 111 | bcopy(cipher->IV, block, 16); | |
| 112 | bcopy(input, iv, 16); | |
| 113 | ((word32*)block)[0] ^= ((word32*)iv)[0]; | |
| 114 | ((word32*)block)[1] ^= ((word32*)iv)[1]; | |
| 115 | ((word32*)block)[2] ^= ((word32*)iv)[2]; | |
| 116 | ((word32*)block)[3] ^= ((word32*)iv)[3]; | |
| 117 | #else | |
| 118 | ((word32*)block)[0] = ((word32*)cipher->IV)[0] ^ ((word32*)input)[0]; | |
| 119 | ((word32*)block)[1] = ((word32*)cipher->IV)[1] ^ ((word32*)input)[1]; | |
| 120 | ((word32*)block)[2] = ((word32*)cipher->IV)[2] ^ ((word32*)input)[2]; | |
| 121 | ((word32*)block)[3] = ((word32*)cipher->IV)[3] ^ ((word32*)input)[3]; | |
| 122 | #endif | |
| 123 | rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS); | |
| 124 | input += 16; | |
| 125 | for (i = numBlocks - 1; i > 0; i--) { | |
| 126 | #if 1 /*STRICT_ALIGN*/ | |
| 127 | bcopy(outBuffer, block, 16); | |
| 128 | ((word32*)block)[0] ^= ((word32*)iv)[0]; | |
| 129 | ((word32*)block)[1] ^= ((word32*)iv)[1]; | |
| 130 | ((word32*)block)[2] ^= ((word32*)iv)[2]; | |
| 131 | ((word32*)block)[3] ^= ((word32*)iv)[3]; | |
| 132 | #else | |
| 133 | ((word32*)block)[0] = ((word32*)outBuffer)[0] ^ ((word32*)input)[0]; | |
| 134 | ((word32*)block)[1] = ((word32*)outBuffer)[1] ^ ((word32*)input)[1]; | |
| 135 | ((word32*)block)[2] = ((word32*)outBuffer)[2] ^ ((word32*)input)[2]; | |
| 136 | ((word32*)block)[3] = ((word32*)outBuffer)[3] ^ ((word32*)input)[3]; | |
| 137 | #endif | |
| 138 | outBuffer += 16; | |
| 139 | rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS); | |
| 140 | input += 16; | |
| 141 | } | |
| 142 | break; | |
| 143 | ||
| 144 | case MODE_CFB1: | |
| 145 | #if 1 /*STRICT_ALIGN*/ | |
| 146 | bcopy(cipher->IV, iv, 16); | |
| 147 | #else /* !STRICT_ALIGN */ | |
| 148 | *((word32*)iv[0]) = *((word32*)(cipher->IV )); | |
| 149 | *((word32*)iv[1]) = *((word32*)(cipher->IV+ 4)); | |
| 150 | *((word32*)iv[2]) = *((word32*)(cipher->IV+ 8)); | |
| 151 | *((word32*)iv[3]) = *((word32*)(cipher->IV+12)); | |
| 152 | #endif /* ?STRICT_ALIGN */ | |
| 153 | for (i = numBlocks; i > 0; i--) { | |
| 154 | for (k = 0; k < 128; k++) { | |
| 155 | *((word32*) block ) = *((word32*)iv[0]); | |
| 156 | *((word32*)(block+ 4)) = *((word32*)iv[1]); | |
| 157 | *((word32*)(block+ 8)) = *((word32*)iv[2]); | |
| 158 | *((word32*)(block+12)) = *((word32*)iv[3]); | |
| 159 | rijndaelEncrypt(block, block, key->keySched, key->ROUNDS); | |
| 160 | outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7); | |
| 161 | iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7); | |
| 162 | iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7); | |
| 163 | iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7); | |
| 164 | iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7); | |
| 165 | iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7); | |
| 166 | iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7); | |
| 167 | iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7); | |
| 168 | iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7); | |
| 169 | iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7); | |
| 170 | iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7); | |
| 171 | iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7); | |
| 172 | iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7); | |
| 173 | iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7); | |
| 174 | iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7); | |
| 175 | iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7); | |
| 176 | iv[3][3] = (iv[3][3] << 1) | ((outBuffer[k/8] >> (7-(k&7))) & 1); | |
| 177 | } | |
| 178 | } | |
| 179 | break; | |
| 180 | ||
| 181 | default: | |
| 182 | return BAD_CIPHER_STATE; | |
| 183 | } | |
| 184 | ||
| 185 | return 128*numBlocks; | |
| 186 | } | |
| 187 | ||
| 188 | /** | |
| 189 | * Encrypt data partitioned in octets, using RFC 2040-like padding. | |
| 190 | * | |
| 191 | * @param input data to be encrypted (octet sequence) | |
| 192 | * @param inputOctets input length in octets (not bits) | |
| 193 | * @param outBuffer encrypted output data | |
| 194 | * | |
| 195 | * @return length in octets (not bits) of the encrypted output buffer. | |
| 196 | */ | |
| 197 | int rijndael_padEncrypt(cipherInstance *cipher, keyInstance *key, | |
| 198 | BYTE *input, int inputOctets, BYTE *outBuffer) { | |
| 199 | int i, numBlocks, padLen; | |
| 200 | word8 block[16], *iv, *cp; | |
| 201 | ||
| 202 | if (cipher == NULL || | |
| 203 | key == NULL || | |
| 204 | key->direction == DIR_DECRYPT) { | |
| 205 | return BAD_CIPHER_STATE; | |
| 206 | } | |
| 207 | if (input == NULL || inputOctets <= 0) { | |
| 208 | return 0; /* nothing to do */ | |
| 209 | } | |
| 210 | ||
| 211 | numBlocks = inputOctets/16; | |
| 212 | ||
| 213 | switch (cipher->mode) { | |
| 214 | case MODE_ECB: | |
| 215 | for (i = numBlocks; i > 0; i--) { | |
| 216 | rijndaelEncrypt(input, outBuffer, key->keySched, key->ROUNDS); | |
| 217 | input += 16; | |
| 218 | outBuffer += 16; | |
| 219 | } | |
| 220 | padLen = 16 - (inputOctets - 16*numBlocks); | |
| 221 | if (padLen > 0 && padLen <= 16) | |
| 222 | panic("rijndael_padEncrypt(ECB)"); | |
| 223 | bcopy(input, block, 16 - padLen); | |
| 224 | for (cp = block + 16 - padLen; cp < block + 16; cp++) | |
| 225 | *cp = padLen; | |
| 226 | rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS); | |
| 227 | break; | |
| 228 | ||
| 229 | case MODE_CBC: | |
| 230 | iv = cipher->IV; | |
| 231 | for (i = numBlocks; i > 0; i--) { | |
| 232 | ((word32*)block)[0] = ((word32*)input)[0] ^ ((word32*)iv)[0]; | |
| 233 | ((word32*)block)[1] = ((word32*)input)[1] ^ ((word32*)iv)[1]; | |
| 234 | ((word32*)block)[2] = ((word32*)input)[2] ^ ((word32*)iv)[2]; | |
| 235 | ((word32*)block)[3] = ((word32*)input)[3] ^ ((word32*)iv)[3]; | |
| 236 | rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS); | |
| 237 | iv = outBuffer; | |
| 238 | input += 16; | |
| 239 | outBuffer += 16; | |
| 240 | } | |
| 241 | padLen = 16 - (inputOctets - 16*numBlocks); | |
| 242 | if (padLen > 0 && padLen <= 16) | |
| 243 | panic("rijndael_padEncrypt(CBC)"); | |
| 244 | for (i = 0; i < 16 - padLen; i++) { | |
| 245 | block[i] = input[i] ^ iv[i]; | |
| 246 | } | |
| 247 | for (i = 16 - padLen; i < 16; i++) { | |
| 248 | block[i] = (BYTE)padLen ^ iv[i]; | |
| 249 | } | |
| 250 | rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS); | |
| 251 | break; | |
| 252 | ||
| 253 | default: | |
| 254 | return BAD_CIPHER_STATE; | |
| 255 | } | |
| 256 | ||
| 257 | return 16*(numBlocks + 1); | |
| 258 | } | |
| 259 | ||
| 260 | int rijndael_blockDecrypt(cipherInstance *cipher, keyInstance *key, | |
| 261 | BYTE *input, int inputLen, BYTE *outBuffer) { | |
| 262 | int i, k, numBlocks; | |
| 263 | word8 block[16], iv[4][4]; | |
| 264 | ||
| 265 | if (cipher == NULL || | |
| 266 | key == NULL || | |
| 267 | (cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT)) { | |
| 268 | return BAD_CIPHER_STATE; | |
| 269 | } | |
| 270 | if (input == NULL || inputLen <= 0) { | |
| 271 | return 0; /* nothing to do */ | |
| 272 | } | |
| 273 | ||
| 274 | numBlocks = inputLen/128; | |
| 275 | ||
| 276 | switch (cipher->mode) { | |
| 277 | case MODE_ECB: | |
| 278 | for (i = numBlocks; i > 0; i--) { | |
| 279 | rijndaelDecrypt(input, outBuffer, key->keySched, key->ROUNDS); | |
| 280 | input += 16; | |
| 281 | outBuffer += 16; | |
| 282 | } | |
| 283 | break; | |
| 284 | ||
| 285 | case MODE_CBC: | |
| 286 | #if 1 /*STRICT_ALIGN */ | |
| 287 | bcopy(cipher->IV, iv, 16); | |
| 288 | #else | |
| 289 | *((word32*)iv[0]) = *((word32*)(cipher->IV )); | |
| 290 | *((word32*)iv[1]) = *((word32*)(cipher->IV+ 4)); | |
| 291 | *((word32*)iv[2]) = *((word32*)(cipher->IV+ 8)); | |
| 292 | *((word32*)iv[3]) = *((word32*)(cipher->IV+12)); | |
| 293 | #endif | |
| 294 | for (i = numBlocks; i > 0; i--) { | |
| 295 | rijndaelDecrypt(input, block, key->keySched, key->ROUNDS); | |
| 296 | ((word32*)block)[0] ^= *((word32*)iv[0]); | |
| 297 | ((word32*)block)[1] ^= *((word32*)iv[1]); | |
| 298 | ((word32*)block)[2] ^= *((word32*)iv[2]); | |
| 299 | ((word32*)block)[3] ^= *((word32*)iv[3]); | |
| 300 | #if 1 /*STRICT_ALIGN*/ | |
| 301 | bcopy(input, iv, 16); | |
| 302 | bcopy(block, outBuffer, 16); | |
| 303 | #else | |
| 304 | *((word32*)iv[0]) = ((word32*)input)[0]; ((word32*)outBuffer)[0] = ((word32*)block)[0]; | |
| 305 | *((word32*)iv[1]) = ((word32*)input)[1]; ((word32*)outBuffer)[1] = ((word32*)block)[1]; | |
| 306 | *((word32*)iv[2]) = ((word32*)input)[2]; ((word32*)outBuffer)[2] = ((word32*)block)[2]; | |
| 307 | *((word32*)iv[3]) = ((word32*)input)[3]; ((word32*)outBuffer)[3] = ((word32*)block)[3]; | |
| 308 | #endif | |
| 309 | input += 16; | |
| 310 | outBuffer += 16; | |
| 311 | } | |
| 312 | break; | |
| 313 | ||
| 314 | case MODE_CFB1: | |
| 315 | #if 1 /*STRICT_ALIGN */ | |
| 316 | bcopy(cipher->IV, iv, 16); | |
| 317 | #else | |
| 318 | *((word32*)iv[0]) = *((word32*)(cipher->IV)); | |
| 319 | *((word32*)iv[1]) = *((word32*)(cipher->IV+ 4)); | |
| 320 | *((word32*)iv[2]) = *((word32*)(cipher->IV+ 8)); | |
| 321 | *((word32*)iv[3]) = *((word32*)(cipher->IV+12)); | |
| 322 | #endif | |
| 323 | for (i = numBlocks; i > 0; i--) { | |
| 324 | for (k = 0; k < 128; k++) { | |
| 325 | *((word32*) block ) = *((word32*)iv[0]); | |
| 326 | *((word32*)(block+ 4)) = *((word32*)iv[1]); | |
| 327 | *((word32*)(block+ 8)) = *((word32*)iv[2]); | |
| 328 | *((word32*)(block+12)) = *((word32*)iv[3]); | |
| 329 | rijndaelEncrypt(block, block, key->keySched, key->ROUNDS); | |
| 330 | iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7); | |
| 331 | iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7); | |
| 332 | iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7); | |
| 333 | iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7); | |
| 334 | iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7); | |
| 335 | iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7); | |
| 336 | iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7); | |
| 337 | iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7); | |
| 338 | iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7); | |
| 339 | iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7); | |
| 340 | iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7); | |
| 341 | iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7); | |
| 342 | iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7); | |
| 343 | iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7); | |
| 344 | iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7); | |
| 345 | iv[3][3] = (iv[3][3] << 1) | ((input[k/8] >> (7-(k&7))) & 1); | |
| 346 | outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7); | |
| 347 | } | |
| 348 | } | |
| 349 | break; | |
| 350 | ||
| 351 | default: | |
| 352 | return BAD_CIPHER_STATE; | |
| 353 | } | |
| 354 | ||
| 355 | return 128*numBlocks; | |
| 356 | } | |
| 357 | ||
| 358 | int rijndael_padDecrypt(cipherInstance *cipher, keyInstance *key, | |
| 359 | BYTE *input, int inputOctets, BYTE *outBuffer) { | |
| 360 | int i, numBlocks, padLen; | |
| 361 | word8 block[16]; | |
| 362 | word32 iv[4]; | |
| 363 | ||
| 364 | if (cipher == NULL || | |
| 365 | key == NULL || | |
| 366 | key->direction == DIR_ENCRYPT) { | |
| 367 | return BAD_CIPHER_STATE; | |
| 368 | } | |
| 369 | if (input == NULL || inputOctets <= 0) { | |
| 370 | return 0; /* nothing to do */ | |
| 371 | } | |
| 372 | if (inputOctets % 16 != 0) { | |
| 373 | return BAD_DATA; | |
| 374 | } | |
| 375 | ||
| 376 | numBlocks = inputOctets/16; | |
| 377 | ||
| 378 | switch (cipher->mode) { | |
| 379 | case MODE_ECB: | |
| 380 | /* all blocks but last */ | |
| 381 | for (i = numBlocks - 1; i > 0; i--) { | |
| 382 | rijndaelDecrypt(input, outBuffer, key->keySched, key->ROUNDS); | |
| 383 | input += 16; | |
| 384 | outBuffer += 16; | |
| 385 | } | |
| 386 | /* last block */ | |
| 387 | rijndaelDecrypt(input, block, key->keySched, key->ROUNDS); | |
| 388 | padLen = block[15]; | |
| 389 | if (padLen >= 16) { | |
| 390 | return BAD_DATA; | |
| 391 | } | |
| 392 | for (i = 16 - padLen; i < 16; i++) { | |
| 393 | if (block[i] != padLen) { | |
| 394 | return BAD_DATA; | |
| 395 | } | |
| 396 | } | |
| 397 | bcopy(block, outBuffer, 16 - padLen); | |
| 398 | break; | |
| 399 | ||
| 400 | case MODE_CBC: | |
| 401 | bcopy(cipher->IV, iv, 16); | |
| 402 | /* all blocks but last */ | |
| 403 | for (i = numBlocks - 1; i > 0; i--) { | |
| 404 | rijndaelDecrypt(input, block, key->keySched, key->ROUNDS); | |
| 405 | ((word32*)block)[0] ^= iv[0]; | |
| 406 | ((word32*)block)[1] ^= iv[1]; | |
| 407 | ((word32*)block)[2] ^= iv[2]; | |
| 408 | ((word32*)block)[3] ^= iv[3]; | |
| 409 | bcopy(input, iv, 16); | |
| 410 | bcopy(block, outBuffer, 16); | |
| 411 | input += 16; | |
| 412 | outBuffer += 16; | |
| 413 | } | |
| 414 | /* last block */ | |
| 415 | rijndaelDecrypt(input, block, key->keySched, key->ROUNDS); | |
| 416 | ((word32*)block)[0] ^= iv[0]; | |
| 417 | ((word32*)block)[1] ^= iv[1]; | |
| 418 | ((word32*)block)[2] ^= iv[2]; | |
| 419 | ((word32*)block)[3] ^= iv[3]; | |
| 420 | padLen = block[15]; | |
| 421 | if (padLen <= 0 || padLen > 16) { | |
| 422 | return BAD_DATA; | |
| 423 | } | |
| 424 | for (i = 16 - padLen; i < 16; i++) { | |
| 425 | if (block[i] != padLen) { | |
| 426 | return BAD_DATA; | |
| 427 | } | |
| 428 | } | |
| 429 | bcopy(block, outBuffer, 16 - padLen); | |
| 430 | break; | |
| 431 | ||
| 432 | default: | |
| 433 | return BAD_CIPHER_STATE; | |
| 434 | } | |
| 435 | ||
| 436 | return 16*numBlocks - padLen; | |
| 437 | } | |
| 438 | ||
| 439 | #ifdef INTERMEDIATE_VALUE_KAT | |
| 440 | /** | |
| 441 | * cipherUpdateRounds: | |
| 442 | * | |
| 443 | * Encrypts/Decrypts exactly one full block a specified number of rounds. | |
| 444 | * Only used in the Intermediate Value Known Answer Test. | |
| 445 | * | |
| 446 | * Returns: | |
| 447 | * TRUE - on success | |
| 448 | * BAD_CIPHER_STATE - cipher in bad state (e.g., not initialized) | |
| 449 | */ | |
| 450 | int rijndael_cipherUpdateRounds(cipherInstance *cipher, keyInstance *key, | |
| 451 | BYTE *input, int inputLen, BYTE *outBuffer, int rounds) { | |
| 452 | int j; | |
| 453 | word8 block[4][4]; | |
| 454 | ||
| 455 | if (cipher == NULL || key == NULL) { | |
| 456 | return BAD_CIPHER_STATE; | |
| 457 | } | |
| 458 | ||
| 459 | for (j = 3; j >= 0; j--) { | |
| 460 | /* parse input stream into rectangular array */ | |
| 461 | *((word32*)block[j]) = *((word32*)(input+4*j)); | |
| 462 | } | |
| 463 | ||
| 464 | switch (key->direction) { | |
| 465 | case DIR_ENCRYPT: | |
| 466 | rijndaelEncryptRound(block, key->keySched, key->ROUNDS, rounds); | |
| 467 | break; | |
| 468 | ||
| 469 | case DIR_DECRYPT: | |
| 470 | rijndaelDecryptRound(block, key->keySched, key->ROUNDS, rounds); | |
| 471 | break; | |
| 472 | ||
| 473 | default: | |
| 474 | return BAD_KEY_DIR; | |
| 475 | } | |
| 476 | ||
| 477 | for (j = 3; j >= 0; j--) { | |
| 478 | /* parse rectangular array into output ciphertext bytes */ | |
| 479 | *((word32*)(outBuffer+4*j)) = *((word32*)block[j]); | |
| 480 | } | |
| 481 | ||
| 482 | return TRUE; | |
| 483 | } | |
| 484 | #endif /* INTERMEDIATE_VALUE_KAT */ |