e_aes_cbc_hmac_sha256.c revision 325337
1/* ==================================================================== 2 * Copyright (c) 2011-2013 The OpenSSL Project. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * 3. All advertising materials mentioning features or use of this 17 * software must display the following acknowledgment: 18 * "This product includes software developed by the OpenSSL Project 19 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 20 * 21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 22 * endorse or promote products derived from this software without 23 * prior written permission. For written permission, please contact 24 * licensing@OpenSSL.org. 25 * 26 * 5. Products derived from this software may not be called "OpenSSL" 27 * nor may "OpenSSL" appear in their names without prior written 28 * permission of the OpenSSL Project. 29 * 30 * 6. Redistributions of any form whatsoever must retain the following 31 * acknowledgment: 32 * "This product includes software developed by the OpenSSL Project 33 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 34 * 35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 46 * OF THE POSSIBILITY OF SUCH DAMAGE. 47 * ==================================================================== 48 */ 49 50#include <openssl/opensslconf.h> 51 52#include <stdio.h> 53#include <string.h> 54 55#if !defined(OPENSSL_NO_AES) && !defined(OPENSSL_NO_SHA256) 56 57# include <openssl/evp.h> 58# include <openssl/objects.h> 59# include <openssl/aes.h> 60# include <openssl/sha.h> 61# include <openssl/rand.h> 62# include "modes_lcl.h" 63# include "constant_time_locl.h" 64 65# ifndef EVP_CIPH_FLAG_AEAD_CIPHER 66# define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000 67# define EVP_CTRL_AEAD_TLS1_AAD 0x16 68# define EVP_CTRL_AEAD_SET_MAC_KEY 0x17 69# endif 70 71# if !defined(EVP_CIPH_FLAG_DEFAULT_ASN1) 72# define EVP_CIPH_FLAG_DEFAULT_ASN1 0 73# endif 74 75# if !defined(EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) 76# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0 77# endif 78 79# define TLS1_1_VERSION 0x0302 80 81typedef struct { 82 AES_KEY ks; 83 SHA256_CTX head, tail, md; 84 size_t payload_length; /* AAD length in decrypt case */ 85 union { 86 unsigned int tls_ver; 87 unsigned char tls_aad[16]; /* 13 used */ 88 } aux; 89} EVP_AES_HMAC_SHA256; 90 91# define NO_PAYLOAD_LENGTH ((size_t)-1) 92 93# if defined(AES_ASM) && ( \ 94 defined(__x86_64) || defined(__x86_64__) || \ 95 defined(_M_AMD64) || defined(_M_X64) || \ 96 defined(__INTEL__) ) 97 98extern unsigned int OPENSSL_ia32cap_P[]; 99# define AESNI_CAPABLE (1<<(57-32)) 100 101int aesni_set_encrypt_key(const unsigned char *userKey, int bits, 102 AES_KEY *key); 103int aesni_set_decrypt_key(const unsigned char *userKey, int bits, 104 AES_KEY *key); 105 106void aesni_cbc_encrypt(const unsigned char *in, 107 unsigned char *out, 108 size_t length, 109 const AES_KEY *key, unsigned char *ivec, int enc); 110 111int aesni_cbc_sha256_enc(const void *inp, void *out, size_t blocks, 112 const AES_KEY *key, unsigned char iv[16], 113 SHA256_CTX *ctx, const void *in0); 114 115# define data(ctx) ((EVP_AES_HMAC_SHA256 *)(ctx)->cipher_data) 116 117static int aesni_cbc_hmac_sha256_init_key(EVP_CIPHER_CTX *ctx, 118 const unsigned char *inkey, 119 const unsigned char *iv, int enc) 120{ 121 EVP_AES_HMAC_SHA256 *key = data(ctx); 122 int ret; 123 124 if (enc) 125 memset(&key->ks, 0, sizeof(key->ks.rd_key)), 126 ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks); 127 else 128 ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks); 129 130 SHA256_Init(&key->head); /* handy when benchmarking */ 131 key->tail = key->head; 132 key->md = key->head; 133 134 key->payload_length = NO_PAYLOAD_LENGTH; 135 136 return ret < 0 ? 0 : 1; 137} 138 139# define STITCHED_CALL 140 141# if !defined(STITCHED_CALL) 142# define aes_off 0 143# endif 144 145void sha256_block_data_order(void *c, const void *p, size_t len); 146 147static void sha256_update(SHA256_CTX *c, const void *data, size_t len) 148{ 149 const unsigned char *ptr = data; 150 size_t res; 151 152 if ((res = c->num)) { 153 res = SHA256_CBLOCK - res; 154 if (len < res) 155 res = len; 156 SHA256_Update(c, ptr, res); 157 ptr += res; 158 len -= res; 159 } 160 161 res = len % SHA256_CBLOCK; 162 len -= res; 163 164 if (len) { 165 sha256_block_data_order(c, ptr, len / SHA256_CBLOCK); 166 167 ptr += len; 168 c->Nh += len >> 29; 169 c->Nl += len <<= 3; 170 if (c->Nl < (unsigned int)len) 171 c->Nh++; 172 } 173 174 if (res) 175 SHA256_Update(c, ptr, res); 176} 177 178# ifdef SHA256_Update 179# undef SHA256_Update 180# endif 181# define SHA256_Update sha256_update 182 183# if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 184 185typedef struct { 186 unsigned int A[8], B[8], C[8], D[8], E[8], F[8], G[8], H[8]; 187} SHA256_MB_CTX; 188typedef struct { 189 const unsigned char *ptr; 190 int blocks; 191} HASH_DESC; 192 193void sha256_multi_block(SHA256_MB_CTX *, const HASH_DESC *, int); 194 195typedef struct { 196 const unsigned char *inp; 197 unsigned char *out; 198 int blocks; 199 u64 iv[2]; 200} CIPH_DESC; 201 202void aesni_multi_cbc_encrypt(CIPH_DESC *, void *, int); 203 204static size_t tls1_1_multi_block_encrypt(EVP_AES_HMAC_SHA256 *key, 205 unsigned char *out, 206 const unsigned char *inp, 207 size_t inp_len, int n4x) 208{ /* n4x is 1 or 2 */ 209 HASH_DESC hash_d[8], edges[8]; 210 CIPH_DESC ciph_d[8]; 211 unsigned char storage[sizeof(SHA256_MB_CTX) + 32]; 212 union { 213 u64 q[16]; 214 u32 d[32]; 215 u8 c[128]; 216 } blocks[8]; 217 SHA256_MB_CTX *ctx; 218 unsigned int frag, last, packlen, i, x4 = 4 * n4x, minblocks, processed = 219 0; 220 size_t ret = 0; 221 u8 *IVs; 222# if defined(BSWAP8) 223 u64 seqnum; 224# endif 225 226 /* ask for IVs in bulk */ 227 if (RAND_bytes((IVs = blocks[0].c), 16 * x4) <= 0) 228 return 0; 229 230 /* align */ 231 ctx = (SHA256_MB_CTX *) (storage + 32 - ((size_t)storage % 32)); 232 233 frag = (unsigned int)inp_len >> (1 + n4x); 234 last = (unsigned int)inp_len + frag - (frag << (1 + n4x)); 235 if (last > frag && ((last + 13 + 9) % 64) < (x4 - 1)) { 236 frag++; 237 last -= x4 - 1; 238 } 239 240 packlen = 5 + 16 + ((frag + 32 + 16) & -16); 241 242 /* populate descriptors with pointers and IVs */ 243 hash_d[0].ptr = inp; 244 ciph_d[0].inp = inp; 245 /* 5+16 is place for header and explicit IV */ 246 ciph_d[0].out = out + 5 + 16; 247 memcpy(ciph_d[0].out - 16, IVs, 16); 248 memcpy(ciph_d[0].iv, IVs, 16); 249 IVs += 16; 250 251 for (i = 1; i < x4; i++) { 252 ciph_d[i].inp = hash_d[i].ptr = hash_d[i - 1].ptr + frag; 253 ciph_d[i].out = ciph_d[i - 1].out + packlen; 254 memcpy(ciph_d[i].out - 16, IVs, 16); 255 memcpy(ciph_d[i].iv, IVs, 16); 256 IVs += 16; 257 } 258 259# if defined(BSWAP8) 260 memcpy(blocks[0].c, key->md.data, 8); 261 seqnum = BSWAP8(blocks[0].q[0]); 262# endif 263 for (i = 0; i < x4; i++) { 264 unsigned int len = (i == (x4 - 1) ? last : frag); 265# if !defined(BSWAP8) 266 unsigned int carry, j; 267# endif 268 269 ctx->A[i] = key->md.h[0]; 270 ctx->B[i] = key->md.h[1]; 271 ctx->C[i] = key->md.h[2]; 272 ctx->D[i] = key->md.h[3]; 273 ctx->E[i] = key->md.h[4]; 274 ctx->F[i] = key->md.h[5]; 275 ctx->G[i] = key->md.h[6]; 276 ctx->H[i] = key->md.h[7]; 277 278 /* fix seqnum */ 279# if defined(BSWAP8) 280 blocks[i].q[0] = BSWAP8(seqnum + i); 281# else 282 for (carry = i, j = 8; j--;) { 283 blocks[i].c[j] = ((u8 *)key->md.data)[j] + carry; 284 carry = (blocks[i].c[j] - carry) >> (sizeof(carry) * 8 - 1); 285 } 286# endif 287 blocks[i].c[8] = ((u8 *)key->md.data)[8]; 288 blocks[i].c[9] = ((u8 *)key->md.data)[9]; 289 blocks[i].c[10] = ((u8 *)key->md.data)[10]; 290 /* fix length */ 291 blocks[i].c[11] = (u8)(len >> 8); 292 blocks[i].c[12] = (u8)(len); 293 294 memcpy(blocks[i].c + 13, hash_d[i].ptr, 64 - 13); 295 hash_d[i].ptr += 64 - 13; 296 hash_d[i].blocks = (len - (64 - 13)) / 64; 297 298 edges[i].ptr = blocks[i].c; 299 edges[i].blocks = 1; 300 } 301 302 /* hash 13-byte headers and first 64-13 bytes of inputs */ 303 sha256_multi_block(ctx, edges, n4x); 304 /* hash bulk inputs */ 305# define MAXCHUNKSIZE 2048 306# if MAXCHUNKSIZE%64 307# error "MAXCHUNKSIZE is not divisible by 64" 308# elif MAXCHUNKSIZE 309 /* 310 * goal is to minimize pressure on L1 cache by moving in shorter steps, 311 * so that hashed data is still in the cache by the time we encrypt it 312 */ 313 minblocks = ((frag <= last ? frag : last) - (64 - 13)) / 64; 314 if (minblocks > MAXCHUNKSIZE / 64) { 315 for (i = 0; i < x4; i++) { 316 edges[i].ptr = hash_d[i].ptr; 317 edges[i].blocks = MAXCHUNKSIZE / 64; 318 ciph_d[i].blocks = MAXCHUNKSIZE / 16; 319 } 320 do { 321 sha256_multi_block(ctx, edges, n4x); 322 aesni_multi_cbc_encrypt(ciph_d, &key->ks, n4x); 323 324 for (i = 0; i < x4; i++) { 325 edges[i].ptr = hash_d[i].ptr += MAXCHUNKSIZE; 326 hash_d[i].blocks -= MAXCHUNKSIZE / 64; 327 edges[i].blocks = MAXCHUNKSIZE / 64; 328 ciph_d[i].inp += MAXCHUNKSIZE; 329 ciph_d[i].out += MAXCHUNKSIZE; 330 ciph_d[i].blocks = MAXCHUNKSIZE / 16; 331 memcpy(ciph_d[i].iv, ciph_d[i].out - 16, 16); 332 } 333 processed += MAXCHUNKSIZE; 334 minblocks -= MAXCHUNKSIZE / 64; 335 } while (minblocks > MAXCHUNKSIZE / 64); 336 } 337# endif 338# undef MAXCHUNKSIZE 339 sha256_multi_block(ctx, hash_d, n4x); 340 341 memset(blocks, 0, sizeof(blocks)); 342 for (i = 0; i < x4; i++) { 343 unsigned int len = (i == (x4 - 1) ? last : frag), 344 off = hash_d[i].blocks * 64; 345 const unsigned char *ptr = hash_d[i].ptr + off; 346 347 off = (len - processed) - (64 - 13) - off; /* remainder actually */ 348 memcpy(blocks[i].c, ptr, off); 349 blocks[i].c[off] = 0x80; 350 len += 64 + 13; /* 64 is HMAC header */ 351 len *= 8; /* convert to bits */ 352 if (off < (64 - 8)) { 353# ifdef BSWAP4 354 blocks[i].d[15] = BSWAP4(len); 355# else 356 PUTU32(blocks[i].c + 60, len); 357# endif 358 edges[i].blocks = 1; 359 } else { 360# ifdef BSWAP4 361 blocks[i].d[31] = BSWAP4(len); 362# else 363 PUTU32(blocks[i].c + 124, len); 364# endif 365 edges[i].blocks = 2; 366 } 367 edges[i].ptr = blocks[i].c; 368 } 369 370 /* hash input tails and finalize */ 371 sha256_multi_block(ctx, edges, n4x); 372 373 memset(blocks, 0, sizeof(blocks)); 374 for (i = 0; i < x4; i++) { 375# ifdef BSWAP4 376 blocks[i].d[0] = BSWAP4(ctx->A[i]); 377 ctx->A[i] = key->tail.h[0]; 378 blocks[i].d[1] = BSWAP4(ctx->B[i]); 379 ctx->B[i] = key->tail.h[1]; 380 blocks[i].d[2] = BSWAP4(ctx->C[i]); 381 ctx->C[i] = key->tail.h[2]; 382 blocks[i].d[3] = BSWAP4(ctx->D[i]); 383 ctx->D[i] = key->tail.h[3]; 384 blocks[i].d[4] = BSWAP4(ctx->E[i]); 385 ctx->E[i] = key->tail.h[4]; 386 blocks[i].d[5] = BSWAP4(ctx->F[i]); 387 ctx->F[i] = key->tail.h[5]; 388 blocks[i].d[6] = BSWAP4(ctx->G[i]); 389 ctx->G[i] = key->tail.h[6]; 390 blocks[i].d[7] = BSWAP4(ctx->H[i]); 391 ctx->H[i] = key->tail.h[7]; 392 blocks[i].c[32] = 0x80; 393 blocks[i].d[15] = BSWAP4((64 + 32) * 8); 394# else 395 PUTU32(blocks[i].c + 0, ctx->A[i]); 396 ctx->A[i] = key->tail.h[0]; 397 PUTU32(blocks[i].c + 4, ctx->B[i]); 398 ctx->B[i] = key->tail.h[1]; 399 PUTU32(blocks[i].c + 8, ctx->C[i]); 400 ctx->C[i] = key->tail.h[2]; 401 PUTU32(blocks[i].c + 12, ctx->D[i]); 402 ctx->D[i] = key->tail.h[3]; 403 PUTU32(blocks[i].c + 16, ctx->E[i]); 404 ctx->E[i] = key->tail.h[4]; 405 PUTU32(blocks[i].c + 20, ctx->F[i]); 406 ctx->F[i] = key->tail.h[5]; 407 PUTU32(blocks[i].c + 24, ctx->G[i]); 408 ctx->G[i] = key->tail.h[6]; 409 PUTU32(blocks[i].c + 28, ctx->H[i]); 410 ctx->H[i] = key->tail.h[7]; 411 blocks[i].c[32] = 0x80; 412 PUTU32(blocks[i].c + 60, (64 + 32) * 8); 413# endif 414 edges[i].ptr = blocks[i].c; 415 edges[i].blocks = 1; 416 } 417 418 /* finalize MACs */ 419 sha256_multi_block(ctx, edges, n4x); 420 421 for (i = 0; i < x4; i++) { 422 unsigned int len = (i == (x4 - 1) ? last : frag), pad, j; 423 unsigned char *out0 = out; 424 425 memcpy(ciph_d[i].out, ciph_d[i].inp, len - processed); 426 ciph_d[i].inp = ciph_d[i].out; 427 428 out += 5 + 16 + len; 429 430 /* write MAC */ 431 PUTU32(out + 0, ctx->A[i]); 432 PUTU32(out + 4, ctx->B[i]); 433 PUTU32(out + 8, ctx->C[i]); 434 PUTU32(out + 12, ctx->D[i]); 435 PUTU32(out + 16, ctx->E[i]); 436 PUTU32(out + 20, ctx->F[i]); 437 PUTU32(out + 24, ctx->G[i]); 438 PUTU32(out + 28, ctx->H[i]); 439 out += 32; 440 len += 32; 441 442 /* pad */ 443 pad = 15 - len % 16; 444 for (j = 0; j <= pad; j++) 445 *(out++) = pad; 446 len += pad + 1; 447 448 ciph_d[i].blocks = (len - processed) / 16; 449 len += 16; /* account for explicit iv */ 450 451 /* arrange header */ 452 out0[0] = ((u8 *)key->md.data)[8]; 453 out0[1] = ((u8 *)key->md.data)[9]; 454 out0[2] = ((u8 *)key->md.data)[10]; 455 out0[3] = (u8)(len >> 8); 456 out0[4] = (u8)(len); 457 458 ret += len + 5; 459 inp += frag; 460 } 461 462 aesni_multi_cbc_encrypt(ciph_d, &key->ks, n4x); 463 464 OPENSSL_cleanse(blocks, sizeof(blocks)); 465 OPENSSL_cleanse(ctx, sizeof(*ctx)); 466 467 return ret; 468} 469# endif 470 471static int aesni_cbc_hmac_sha256_cipher(EVP_CIPHER_CTX *ctx, 472 unsigned char *out, 473 const unsigned char *in, size_t len) 474{ 475 EVP_AES_HMAC_SHA256 *key = data(ctx); 476 unsigned int l; 477 size_t plen = key->payload_length, iv = 0, /* explicit IV in TLS 1.1 and 478 * later */ 479 sha_off = 0; 480# if defined(STITCHED_CALL) 481 size_t aes_off = 0, blocks; 482 483 sha_off = SHA256_CBLOCK - key->md.num; 484# endif 485 486 key->payload_length = NO_PAYLOAD_LENGTH; 487 488 if (len % AES_BLOCK_SIZE) 489 return 0; 490 491 if (ctx->encrypt) { 492 if (plen == NO_PAYLOAD_LENGTH) 493 plen = len; 494 else if (len != 495 ((plen + SHA256_DIGEST_LENGTH + 496 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE)) 497 return 0; 498 else if (key->aux.tls_ver >= TLS1_1_VERSION) 499 iv = AES_BLOCK_SIZE; 500 501# if defined(STITCHED_CALL) 502 /* 503 * Assembly stitch handles AVX-capable processors, but its 504 * performance is not optimal on AMD Jaguar, ~40% worse, for 505 * unknown reasons. Incidentally processor in question supports 506 * AVX, but not AMD-specific XOP extension, which can be used 507 * to identify it and avoid stitch invocation. So that after we 508 * establish that current CPU supports AVX, we even see if it's 509 * either even XOP-capable Bulldozer-based or GenuineIntel one. 510 * But SHAEXT-capable go ahead... 511 */ 512 if (((OPENSSL_ia32cap_P[2] & (1 << 29)) || /* SHAEXT? */ 513 ((OPENSSL_ia32cap_P[1] & (1 << (60 - 32))) && /* AVX? */ 514 ((OPENSSL_ia32cap_P[1] & (1 << (43 - 32))) /* XOP? */ 515 | (OPENSSL_ia32cap_P[0] & (1 << 30))))) && /* "Intel CPU"? */ 516 plen > (sha_off + iv) && 517 (blocks = (plen - (sha_off + iv)) / SHA256_CBLOCK)) { 518 SHA256_Update(&key->md, in + iv, sha_off); 519 520 (void)aesni_cbc_sha256_enc(in, out, blocks, &key->ks, 521 ctx->iv, &key->md, in + iv + sha_off); 522 blocks *= SHA256_CBLOCK; 523 aes_off += blocks; 524 sha_off += blocks; 525 key->md.Nh += blocks >> 29; 526 key->md.Nl += blocks <<= 3; 527 if (key->md.Nl < (unsigned int)blocks) 528 key->md.Nh++; 529 } else { 530 sha_off = 0; 531 } 532# endif 533 sha_off += iv; 534 SHA256_Update(&key->md, in + sha_off, plen - sha_off); 535 536 if (plen != len) { /* "TLS" mode of operation */ 537 if (in != out) 538 memcpy(out + aes_off, in + aes_off, plen - aes_off); 539 540 /* calculate HMAC and append it to payload */ 541 SHA256_Final(out + plen, &key->md); 542 key->md = key->tail; 543 SHA256_Update(&key->md, out + plen, SHA256_DIGEST_LENGTH); 544 SHA256_Final(out + plen, &key->md); 545 546 /* pad the payload|hmac */ 547 plen += SHA256_DIGEST_LENGTH; 548 for (l = len - plen - 1; plen < len; plen++) 549 out[plen] = l; 550 /* encrypt HMAC|padding at once */ 551 aesni_cbc_encrypt(out + aes_off, out + aes_off, len - aes_off, 552 &key->ks, ctx->iv, 1); 553 } else { 554 aesni_cbc_encrypt(in + aes_off, out + aes_off, len - aes_off, 555 &key->ks, ctx->iv, 1); 556 } 557 } else { 558 union { 559 unsigned int u[SHA256_DIGEST_LENGTH / sizeof(unsigned int)]; 560 unsigned char c[64 + SHA256_DIGEST_LENGTH]; 561 } mac, *pmac; 562 563 /* arrange cache line alignment */ 564 pmac = (void *)(((size_t)mac.c + 63) & ((size_t)0 - 64)); 565 566 /* decrypt HMAC|padding at once */ 567 aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0); 568 569 if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */ 570 size_t inp_len, mask, j, i; 571 unsigned int res, maxpad, pad, bitlen; 572 int ret = 1; 573 union { 574 unsigned int u[SHA_LBLOCK]; 575 unsigned char c[SHA256_CBLOCK]; 576 } *data = (void *)key->md.data; 577 578 if ((key->aux.tls_aad[plen - 4] << 8 | key->aux.tls_aad[plen - 3]) 579 >= TLS1_1_VERSION) 580 iv = AES_BLOCK_SIZE; 581 582 if (len < (iv + SHA256_DIGEST_LENGTH + 1)) 583 return 0; 584 585 /* omit explicit iv */ 586 out += iv; 587 len -= iv; 588 589 /* figure out payload length */ 590 pad = out[len - 1]; 591 maxpad = len - (SHA256_DIGEST_LENGTH + 1); 592 maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8); 593 maxpad &= 255; 594 595 mask = constant_time_ge(maxpad, pad); 596 ret &= mask; 597 /* 598 * If pad is invalid then we will fail the above test but we must 599 * continue anyway because we are in constant time code. However, 600 * we'll use the maxpad value instead of the supplied pad to make 601 * sure we perform well defined pointer arithmetic. 602 */ 603 pad = constant_time_select(mask, pad, maxpad); 604 605 inp_len = len - (SHA256_DIGEST_LENGTH + pad + 1); 606 607 key->aux.tls_aad[plen - 2] = inp_len >> 8; 608 key->aux.tls_aad[plen - 1] = inp_len; 609 610 /* calculate HMAC */ 611 key->md = key->head; 612 SHA256_Update(&key->md, key->aux.tls_aad, plen); 613 614# if 1 615 len -= SHA256_DIGEST_LENGTH; /* amend mac */ 616 if (len >= (256 + SHA256_CBLOCK)) { 617 j = (len - (256 + SHA256_CBLOCK)) & (0 - SHA256_CBLOCK); 618 j += SHA256_CBLOCK - key->md.num; 619 SHA256_Update(&key->md, out, j); 620 out += j; 621 len -= j; 622 inp_len -= j; 623 } 624 625 /* but pretend as if we hashed padded payload */ 626 bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */ 627# ifdef BSWAP4 628 bitlen = BSWAP4(bitlen); 629# else 630 mac.c[0] = 0; 631 mac.c[1] = (unsigned char)(bitlen >> 16); 632 mac.c[2] = (unsigned char)(bitlen >> 8); 633 mac.c[3] = (unsigned char)bitlen; 634 bitlen = mac.u[0]; 635# endif 636 637 pmac->u[0] = 0; 638 pmac->u[1] = 0; 639 pmac->u[2] = 0; 640 pmac->u[3] = 0; 641 pmac->u[4] = 0; 642 pmac->u[5] = 0; 643 pmac->u[6] = 0; 644 pmac->u[7] = 0; 645 646 for (res = key->md.num, j = 0; j < len; j++) { 647 size_t c = out[j]; 648 mask = (j - inp_len) >> (sizeof(j) * 8 - 8); 649 c &= mask; 650 c |= 0x80 & ~mask & ~((inp_len - j) >> (sizeof(j) * 8 - 8)); 651 data->c[res++] = (unsigned char)c; 652 653 if (res != SHA256_CBLOCK) 654 continue; 655 656 /* j is not incremented yet */ 657 mask = 0 - ((inp_len + 7 - j) >> (sizeof(j) * 8 - 1)); 658 data->u[SHA_LBLOCK - 1] |= bitlen & mask; 659 sha256_block_data_order(&key->md, data, 1); 660 mask &= 0 - ((j - inp_len - 72) >> (sizeof(j) * 8 - 1)); 661 pmac->u[0] |= key->md.h[0] & mask; 662 pmac->u[1] |= key->md.h[1] & mask; 663 pmac->u[2] |= key->md.h[2] & mask; 664 pmac->u[3] |= key->md.h[3] & mask; 665 pmac->u[4] |= key->md.h[4] & mask; 666 pmac->u[5] |= key->md.h[5] & mask; 667 pmac->u[6] |= key->md.h[6] & mask; 668 pmac->u[7] |= key->md.h[7] & mask; 669 res = 0; 670 } 671 672 for (i = res; i < SHA256_CBLOCK; i++, j++) 673 data->c[i] = 0; 674 675 if (res > SHA256_CBLOCK - 8) { 676 mask = 0 - ((inp_len + 8 - j) >> (sizeof(j) * 8 - 1)); 677 data->u[SHA_LBLOCK - 1] |= bitlen & mask; 678 sha256_block_data_order(&key->md, data, 1); 679 mask &= 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1)); 680 pmac->u[0] |= key->md.h[0] & mask; 681 pmac->u[1] |= key->md.h[1] & mask; 682 pmac->u[2] |= key->md.h[2] & mask; 683 pmac->u[3] |= key->md.h[3] & mask; 684 pmac->u[4] |= key->md.h[4] & mask; 685 pmac->u[5] |= key->md.h[5] & mask; 686 pmac->u[6] |= key->md.h[6] & mask; 687 pmac->u[7] |= key->md.h[7] & mask; 688 689 memset(data, 0, SHA256_CBLOCK); 690 j += 64; 691 } 692 data->u[SHA_LBLOCK - 1] = bitlen; 693 sha256_block_data_order(&key->md, data, 1); 694 mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1)); 695 pmac->u[0] |= key->md.h[0] & mask; 696 pmac->u[1] |= key->md.h[1] & mask; 697 pmac->u[2] |= key->md.h[2] & mask; 698 pmac->u[3] |= key->md.h[3] & mask; 699 pmac->u[4] |= key->md.h[4] & mask; 700 pmac->u[5] |= key->md.h[5] & mask; 701 pmac->u[6] |= key->md.h[6] & mask; 702 pmac->u[7] |= key->md.h[7] & mask; 703 704# ifdef BSWAP4 705 pmac->u[0] = BSWAP4(pmac->u[0]); 706 pmac->u[1] = BSWAP4(pmac->u[1]); 707 pmac->u[2] = BSWAP4(pmac->u[2]); 708 pmac->u[3] = BSWAP4(pmac->u[3]); 709 pmac->u[4] = BSWAP4(pmac->u[4]); 710 pmac->u[5] = BSWAP4(pmac->u[5]); 711 pmac->u[6] = BSWAP4(pmac->u[6]); 712 pmac->u[7] = BSWAP4(pmac->u[7]); 713# else 714 for (i = 0; i < 8; i++) { 715 res = pmac->u[i]; 716 pmac->c[4 * i + 0] = (unsigned char)(res >> 24); 717 pmac->c[4 * i + 1] = (unsigned char)(res >> 16); 718 pmac->c[4 * i + 2] = (unsigned char)(res >> 8); 719 pmac->c[4 * i + 3] = (unsigned char)res; 720 } 721# endif 722 len += SHA256_DIGEST_LENGTH; 723# else 724 SHA256_Update(&key->md, out, inp_len); 725 res = key->md.num; 726 SHA256_Final(pmac->c, &key->md); 727 728 { 729 unsigned int inp_blocks, pad_blocks; 730 731 /* but pretend as if we hashed padded payload */ 732 inp_blocks = 733 1 + ((SHA256_CBLOCK - 9 - res) >> (sizeof(res) * 8 - 1)); 734 res += (unsigned int)(len - inp_len); 735 pad_blocks = res / SHA256_CBLOCK; 736 res %= SHA256_CBLOCK; 737 pad_blocks += 738 1 + ((SHA256_CBLOCK - 9 - res) >> (sizeof(res) * 8 - 1)); 739 for (; inp_blocks < pad_blocks; inp_blocks++) 740 sha1_block_data_order(&key->md, data, 1); 741 } 742# endif 743 key->md = key->tail; 744 SHA256_Update(&key->md, pmac->c, SHA256_DIGEST_LENGTH); 745 SHA256_Final(pmac->c, &key->md); 746 747 /* verify HMAC */ 748 out += inp_len; 749 len -= inp_len; 750# if 1 751 { 752 unsigned char *p = 753 out + len - 1 - maxpad - SHA256_DIGEST_LENGTH; 754 size_t off = out - p; 755 unsigned int c, cmask; 756 757 maxpad += SHA256_DIGEST_LENGTH; 758 for (res = 0, i = 0, j = 0; j < maxpad; j++) { 759 c = p[j]; 760 cmask = 761 ((int)(j - off - SHA256_DIGEST_LENGTH)) >> 762 (sizeof(int) * 8 - 1); 763 res |= (c ^ pad) & ~cmask; /* ... and padding */ 764 cmask &= ((int)(off - 1 - j)) >> (sizeof(int) * 8 - 1); 765 res |= (c ^ pmac->c[i]) & cmask; 766 i += 1 & cmask; 767 } 768 maxpad -= SHA256_DIGEST_LENGTH; 769 770 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1)); 771 ret &= (int)~res; 772 } 773# else 774 for (res = 0, i = 0; i < SHA256_DIGEST_LENGTH; i++) 775 res |= out[i] ^ pmac->c[i]; 776 res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1)); 777 ret &= (int)~res; 778 779 /* verify padding */ 780 pad = (pad & ~res) | (maxpad & res); 781 out = out + len - 1 - pad; 782 for (res = 0, i = 0; i < pad; i++) 783 res |= out[i] ^ pad; 784 785 res = (0 - res) >> (sizeof(res) * 8 - 1); 786 ret &= (int)~res; 787# endif 788 return ret; 789 } else { 790 SHA256_Update(&key->md, out, len); 791 } 792 } 793 794 return 1; 795} 796 797static int aesni_cbc_hmac_sha256_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 798 void *ptr) 799{ 800 EVP_AES_HMAC_SHA256 *key = data(ctx); 801 802 switch (type) { 803 case EVP_CTRL_AEAD_SET_MAC_KEY: 804 { 805 unsigned int i; 806 unsigned char hmac_key[64]; 807 808 memset(hmac_key, 0, sizeof(hmac_key)); 809 810 if (arg > (int)sizeof(hmac_key)) { 811 SHA256_Init(&key->head); 812 SHA256_Update(&key->head, ptr, arg); 813 SHA256_Final(hmac_key, &key->head); 814 } else { 815 memcpy(hmac_key, ptr, arg); 816 } 817 818 for (i = 0; i < sizeof(hmac_key); i++) 819 hmac_key[i] ^= 0x36; /* ipad */ 820 SHA256_Init(&key->head); 821 SHA256_Update(&key->head, hmac_key, sizeof(hmac_key)); 822 823 for (i = 0; i < sizeof(hmac_key); i++) 824 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */ 825 SHA256_Init(&key->tail); 826 SHA256_Update(&key->tail, hmac_key, sizeof(hmac_key)); 827 828 OPENSSL_cleanse(hmac_key, sizeof(hmac_key)); 829 830 return 1; 831 } 832 case EVP_CTRL_AEAD_TLS1_AAD: 833 { 834 unsigned char *p = ptr; 835 unsigned int len; 836 837 if (arg != EVP_AEAD_TLS1_AAD_LEN) 838 return -1; 839 840 len = p[arg - 2] << 8 | p[arg - 1]; 841 842 if (ctx->encrypt) { 843 key->payload_length = len; 844 if ((key->aux.tls_ver = 845 p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) { 846 if (len < AES_BLOCK_SIZE) 847 return 0; 848 len -= AES_BLOCK_SIZE; 849 p[arg - 2] = len >> 8; 850 p[arg - 1] = len; 851 } 852 key->md = key->head; 853 SHA256_Update(&key->md, p, arg); 854 855 return (int)(((len + SHA256_DIGEST_LENGTH + 856 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE) 857 - len); 858 } else { 859 memcpy(key->aux.tls_aad, ptr, arg); 860 key->payload_length = arg; 861 862 return SHA256_DIGEST_LENGTH; 863 } 864 } 865# if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 866 case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE: 867 return (int)(5 + 16 + ((arg + 32 + 16) & -16)); 868 case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD: 869 { 870 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *param = 871 (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *) ptr; 872 unsigned int n4x = 1, x4; 873 unsigned int frag, last, packlen, inp_len; 874 875 if (arg < (int)sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM)) 876 return -1; 877 878 inp_len = param->inp[11] << 8 | param->inp[12]; 879 880 if (ctx->encrypt) { 881 if ((param->inp[9] << 8 | param->inp[10]) < TLS1_1_VERSION) 882 return -1; 883 884 if (inp_len) { 885 if (inp_len < 4096) 886 return 0; /* too short */ 887 888 if (inp_len >= 8192 && OPENSSL_ia32cap_P[2] & (1 << 5)) 889 n4x = 2; /* AVX2 */ 890 } else if ((n4x = param->interleave / 4) && n4x <= 2) 891 inp_len = param->len; 892 else 893 return -1; 894 895 key->md = key->head; 896 SHA256_Update(&key->md, param->inp, 13); 897 898 x4 = 4 * n4x; 899 n4x += 1; 900 901 frag = inp_len >> n4x; 902 last = inp_len + frag - (frag << n4x); 903 if (last > frag && ((last + 13 + 9) % 64 < (x4 - 1))) { 904 frag++; 905 last -= x4 - 1; 906 } 907 908 packlen = 5 + 16 + ((frag + 32 + 16) & -16); 909 packlen = (packlen << n4x) - packlen; 910 packlen += 5 + 16 + ((last + 32 + 16) & -16); 911 912 param->interleave = x4; 913 914 return (int)packlen; 915 } else 916 return -1; /* not yet */ 917 } 918 case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT: 919 { 920 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *param = 921 (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *) ptr; 922 923 return (int)tls1_1_multi_block_encrypt(key, param->out, 924 param->inp, param->len, 925 param->interleave / 4); 926 } 927 case EVP_CTRL_TLS1_1_MULTIBLOCK_DECRYPT: 928# endif 929 default: 930 return -1; 931 } 932} 933 934static EVP_CIPHER aesni_128_cbc_hmac_sha256_cipher = { 935# ifdef NID_aes_128_cbc_hmac_sha256 936 NID_aes_128_cbc_hmac_sha256, 937# else 938 NID_undef, 939# endif 940 16, 16, 16, 941 EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 | 942 EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK, 943 aesni_cbc_hmac_sha256_init_key, 944 aesni_cbc_hmac_sha256_cipher, 945 NULL, 946 sizeof(EVP_AES_HMAC_SHA256), 947 EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_set_asn1_iv, 948 EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_get_asn1_iv, 949 aesni_cbc_hmac_sha256_ctrl, 950 NULL 951}; 952 953static EVP_CIPHER aesni_256_cbc_hmac_sha256_cipher = { 954# ifdef NID_aes_256_cbc_hmac_sha256 955 NID_aes_256_cbc_hmac_sha256, 956# else 957 NID_undef, 958# endif 959 16, 32, 16, 960 EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 | 961 EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK, 962 aesni_cbc_hmac_sha256_init_key, 963 aesni_cbc_hmac_sha256_cipher, 964 NULL, 965 sizeof(EVP_AES_HMAC_SHA256), 966 EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_set_asn1_iv, 967 EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_get_asn1_iv, 968 aesni_cbc_hmac_sha256_ctrl, 969 NULL 970}; 971 972const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha256(void) 973{ 974 return ((OPENSSL_ia32cap_P[1] & AESNI_CAPABLE) && 975 aesni_cbc_sha256_enc(NULL, NULL, 0, NULL, NULL, NULL, NULL) ? 976 &aesni_128_cbc_hmac_sha256_cipher : NULL); 977} 978 979const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha256(void) 980{ 981 return ((OPENSSL_ia32cap_P[1] & AESNI_CAPABLE) && 982 aesni_cbc_sha256_enc(NULL, NULL, 0, NULL, NULL, NULL, NULL) ? 983 &aesni_256_cbc_hmac_sha256_cipher : NULL); 984} 985# else 986const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha256(void) 987{ 988 return NULL; 989} 990 991const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha256(void) 992{ 993 return NULL; 994} 995# endif 996#endif 997