1 /* ==================================================================== 2 * Copyright (c) 2001-2011 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 * openssl-core (at) 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 #include <string.h> 50 51 #include <openssl/aead.h> 52 #include <openssl/aes.h> 53 #include <openssl/cipher.h> 54 #include <openssl/cpu.h> 55 #include <openssl/err.h> 56 #include <openssl/mem.h> 57 #include <openssl/modes.h> 58 #include <openssl/obj.h> 59 #include <openssl/rand.h> 60 #include <openssl/sha.h> 61 62 #include "internal.h" 63 #include "../internal.h" 64 #include "../modes/internal.h" 65 66 #if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) 67 #include "../arm_arch.h" 68 #endif 69 70 71 typedef struct { 72 union { 73 double align; 74 AES_KEY ks; 75 } ks; 76 block128_f block; 77 union { 78 cbc128_f cbc; 79 ctr128_f ctr; 80 } stream; 81 } EVP_AES_KEY; 82 83 typedef struct { 84 union { 85 double align; 86 AES_KEY ks; 87 } ks; /* AES key schedule to use */ 88 int key_set; /* Set if key initialised */ 89 int iv_set; /* Set if an iv is set */ 90 GCM128_CONTEXT gcm; 91 uint8_t *iv; /* Temporary IV store */ 92 int ivlen; /* IV length */ 93 int taglen; 94 int iv_gen; /* It is OK to generate IVs */ 95 ctr128_f ctr; 96 } EVP_AES_GCM_CTX; 97 98 #if !defined(OPENSSL_NO_ASM) && \ 99 (defined(OPENSSL_X86_64) || defined(OPENSSL_X86)) 100 #define VPAES 101 extern unsigned int OPENSSL_ia32cap_P[]; 102 103 static char vpaes_capable(void) { 104 return (OPENSSL_ia32cap_P[1] & (1 << (41 - 32))) != 0; 105 } 106 107 #if defined(OPENSSL_X86_64) 108 #define BSAES 109 static char bsaes_capable(void) { 110 return vpaes_capable(); 111 } 112 #endif 113 114 #elif !defined(OPENSSL_NO_ASM) && \ 115 (defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)) 116 #include "../arm_arch.h" 117 118 #if defined(OPENSSL_ARM) && __ARM_MAX_ARCH__ >= 7 119 #define BSAES 120 static char bsaes_capable(void) { 121 return CRYPTO_is_NEON_capable(); 122 } 123 #endif 124 125 #define HWAES 126 static char hwaes_capable(void) { 127 return (OPENSSL_armcap_P & ARMV8_AES) != 0; 128 } 129 130 int aes_v8_set_encrypt_key(const uint8_t *user_key, const int bits, 131 AES_KEY *key); 132 int aes_v8_set_decrypt_key(const uint8_t *user_key, const int bits, 133 AES_KEY *key); 134 void aes_v8_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 135 void aes_v8_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 136 void aes_v8_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 137 const AES_KEY *key, uint8_t *ivec, const int enc); 138 void aes_v8_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len, 139 const AES_KEY *key, const uint8_t ivec[16]); 140 141 #endif /* OPENSSL_ARM */ 142 143 #if defined(BSAES) 144 /* On platforms where BSAES gets defined (just above), then these functions are 145 * provided by asm. */ 146 void bsaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 147 const AES_KEY *key, uint8_t ivec[16], int enc); 148 void bsaes_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len, 149 const AES_KEY *key, const uint8_t ivec[16]); 150 #else 151 static char bsaes_capable(void) { 152 return 0; 153 } 154 155 /* On other platforms, bsaes_capable() will always return false and so the 156 * following will never be called. */ 157 void bsaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 158 const AES_KEY *key, uint8_t ivec[16], int enc) { 159 abort(); 160 } 161 162 void bsaes_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len, 163 const AES_KEY *key, const uint8_t ivec[16]) { 164 abort(); 165 } 166 #endif 167 168 #if defined(VPAES) 169 /* On platforms where VPAES gets defined (just above), then these functions are 170 * provided by asm. */ 171 int vpaes_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key); 172 int vpaes_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key); 173 174 void vpaes_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 175 void vpaes_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 176 177 void vpaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 178 const AES_KEY *key, uint8_t *ivec, int enc); 179 #else 180 static char vpaes_capable(void) { 181 return 0; 182 } 183 184 /* On other platforms, vpaes_capable() will always return false and so the 185 * following will never be called. */ 186 int vpaes_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { 187 abort(); 188 } 189 int vpaes_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { 190 abort(); 191 } 192 void vpaes_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { 193 abort(); 194 } 195 void vpaes_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { 196 abort(); 197 } 198 void vpaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 199 const AES_KEY *key, uint8_t *ivec, int enc) { 200 abort(); 201 } 202 #endif 203 204 #if !defined(HWAES) 205 /* If HWAES isn't defined then we provide dummy functions for each of the hwaes 206 * functions. */ 207 int hwaes_capable(void) { 208 return 0; 209 } 210 211 int aes_v8_set_encrypt_key(const uint8_t *user_key, int bits, 212 AES_KEY *key) { 213 abort(); 214 } 215 216 int aes_v8_set_decrypt_key(const uint8_t *user_key, int bits, AES_KEY *key) { 217 abort(); 218 } 219 220 void aes_v8_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { 221 abort(); 222 } 223 224 void aes_v8_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { 225 abort(); 226 } 227 228 void aes_v8_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 229 const AES_KEY *key, uint8_t *ivec, int enc) { 230 abort(); 231 } 232 233 void aes_v8_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len, 234 const AES_KEY *key, const uint8_t ivec[16]) { 235 abort(); 236 } 237 #endif 238 239 #if !defined(OPENSSL_NO_ASM) && \ 240 (defined(OPENSSL_X86_64) || defined(OPENSSL_X86)) 241 int aesni_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key); 242 int aesni_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key); 243 244 void aesni_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 245 void aesni_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); 246 247 void aesni_ecb_encrypt(const uint8_t *in, uint8_t *out, size_t length, 248 const AES_KEY *key, int enc); 249 void aesni_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 250 const AES_KEY *key, uint8_t *ivec, int enc); 251 252 void aesni_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t blocks, 253 const void *key, const uint8_t *ivec); 254 255 #if defined(OPENSSL_X86_64) 256 size_t aesni_gcm_encrypt(const uint8_t *in, uint8_t *out, size_t len, 257 const void *key, uint8_t ivec[16], uint64_t *Xi); 258 #define AES_gcm_encrypt aesni_gcm_encrypt 259 size_t aesni_gcm_decrypt(const uint8_t *in, uint8_t *out, size_t len, 260 const void *key, uint8_t ivec[16], uint64_t *Xi); 261 #define AES_gcm_decrypt aesni_gcm_decrypt 262 void gcm_ghash_avx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *in, 263 size_t len); 264 #define AES_GCM_ASM(gctx) \ 265 (gctx->ctr == aesni_ctr32_encrypt_blocks && gctx->gcm.ghash == gcm_ghash_avx) 266 #endif /* OPENSSL_X86_64 */ 267 268 #else 269 270 /* On other platforms, aesni_capable() will always return false and so the 271 * following will never be called. */ 272 void aesni_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { 273 abort(); 274 } 275 int aesni_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { 276 abort(); 277 } 278 void aesni_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t blocks, 279 const void *key, const uint8_t *ivec) { 280 abort(); 281 } 282 283 #endif 284 285 static int aes_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 286 const uint8_t *iv, int enc) 287 OPENSSL_SUPPRESS_UNREACHABLE_CODE_WARNINGS { 288 int ret, mode; 289 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 290 291 mode = ctx->cipher->flags & EVP_CIPH_MODE_MASK; 292 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && !enc) { 293 if (hwaes_capable()) { 294 ret = aes_v8_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 295 dat->block = (block128_f)aes_v8_decrypt; 296 dat->stream.cbc = NULL; 297 if (mode == EVP_CIPH_CBC_MODE) { 298 dat->stream.cbc = (cbc128_f)aes_v8_cbc_encrypt; 299 } 300 } else if (bsaes_capable() && mode == EVP_CIPH_CBC_MODE) { 301 ret = AES_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 302 dat->block = (block128_f)AES_decrypt; 303 dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt; 304 } else if (vpaes_capable()) { 305 ret = vpaes_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 306 dat->block = (block128_f)vpaes_decrypt; 307 dat->stream.cbc = 308 mode == EVP_CIPH_CBC_MODE ? (cbc128_f)vpaes_cbc_encrypt : NULL; 309 } else { 310 ret = AES_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 311 dat->block = (block128_f)AES_decrypt; 312 dat->stream.cbc = 313 mode == EVP_CIPH_CBC_MODE ? (cbc128_f)AES_cbc_encrypt : NULL; 314 } 315 } else if (hwaes_capable()) { 316 ret = aes_v8_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 317 dat->block = (block128_f)aes_v8_encrypt; 318 dat->stream.cbc = NULL; 319 if (mode == EVP_CIPH_CBC_MODE) { 320 dat->stream.cbc = (cbc128_f)aes_v8_cbc_encrypt; 321 } else if (mode == EVP_CIPH_CTR_MODE) { 322 dat->stream.ctr = (ctr128_f)aes_v8_ctr32_encrypt_blocks; 323 } 324 } else if (bsaes_capable() && mode == EVP_CIPH_CTR_MODE) { 325 ret = AES_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 326 dat->block = (block128_f)AES_encrypt; 327 dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks; 328 } else if (vpaes_capable()) { 329 ret = vpaes_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 330 dat->block = (block128_f)vpaes_encrypt; 331 dat->stream.cbc = 332 mode == EVP_CIPH_CBC_MODE ? (cbc128_f)vpaes_cbc_encrypt : NULL; 333 } else { 334 ret = AES_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks); 335 dat->block = (block128_f)AES_encrypt; 336 dat->stream.cbc = 337 mode == EVP_CIPH_CBC_MODE ? (cbc128_f)AES_cbc_encrypt : NULL; 338 } 339 340 if (ret < 0) { 341 OPENSSL_PUT_ERROR(CIPHER, aes_init_key, CIPHER_R_AES_KEY_SETUP_FAILED); 342 return 0; 343 } 344 345 return 1; 346 } 347 348 static int aes_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 349 size_t len) { 350 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 351 352 if (dat->stream.cbc) { 353 (*dat->stream.cbc)(in, out, len, &dat->ks, ctx->iv, ctx->encrypt); 354 } else if (ctx->encrypt) { 355 CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv, dat->block); 356 } else { 357 CRYPTO_cbc128_decrypt(in, out, len, &dat->ks, ctx->iv, dat->block); 358 } 359 360 return 1; 361 } 362 363 static int aes_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 364 size_t len) { 365 size_t bl = ctx->cipher->block_size; 366 size_t i; 367 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 368 369 if (len < bl) { 370 return 1; 371 } 372 373 for (i = 0, len -= bl; i <= len; i += bl) { 374 (*dat->block)(in + i, out + i, &dat->ks); 375 } 376 377 return 1; 378 } 379 380 static int aes_ctr_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 381 size_t len) { 382 unsigned int num = ctx->num; 383 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 384 385 if (dat->stream.ctr) { 386 CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks, ctx->iv, ctx->buf, &num, 387 dat->stream.ctr); 388 } else { 389 CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, ctx->iv, ctx->buf, &num, 390 dat->block); 391 } 392 ctx->num = (size_t)num; 393 return 1; 394 } 395 396 static int aes_ofb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 397 size_t len) { 398 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 399 400 CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num, dat->block); 401 return 1; 402 } 403 404 static char aesni_capable(void); 405 406 static ctr128_f aes_ctr_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx, 407 block128_f *out_block, const uint8_t *key, 408 size_t key_len) 409 OPENSSL_SUPPRESS_UNREACHABLE_CODE_WARNINGS { 410 if (aesni_capable()) { 411 aesni_set_encrypt_key(key, key_len * 8, aes_key); 412 if (gcm_ctx != NULL) { 413 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aesni_encrypt); 414 } 415 if (out_block) { 416 *out_block = (block128_f) aesni_encrypt; 417 } 418 return (ctr128_f)aesni_ctr32_encrypt_blocks; 419 } 420 421 if (hwaes_capable()) { 422 aes_v8_set_encrypt_key(key, key_len * 8, aes_key); 423 if (gcm_ctx != NULL) { 424 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aes_v8_encrypt); 425 } 426 if (out_block) { 427 *out_block = (block128_f) aes_v8_encrypt; 428 } 429 return (ctr128_f)aes_v8_ctr32_encrypt_blocks; 430 } 431 432 if (bsaes_capable()) { 433 AES_set_encrypt_key(key, key_len * 8, aes_key); 434 if (gcm_ctx != NULL) { 435 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); 436 } 437 if (out_block) { 438 *out_block = (block128_f) AES_encrypt; 439 } 440 return (ctr128_f)bsaes_ctr32_encrypt_blocks; 441 } 442 443 if (vpaes_capable()) { 444 vpaes_set_encrypt_key(key, key_len * 8, aes_key); 445 if (out_block) { 446 *out_block = (block128_f) vpaes_encrypt; 447 } 448 if (gcm_ctx != NULL) { 449 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt); 450 } 451 return NULL; 452 } 453 454 AES_set_encrypt_key(key, key_len * 8, aes_key); 455 if (gcm_ctx != NULL) { 456 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); 457 } 458 if (out_block) { 459 *out_block = (block128_f) AES_encrypt; 460 } 461 return NULL; 462 } 463 464 static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 465 const uint8_t *iv, int enc) { 466 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 467 if (!iv && !key) { 468 return 1; 469 } 470 if (key) { 471 gctx->ctr = 472 aes_ctr_set_key(&gctx->ks.ks, &gctx->gcm, NULL, key, ctx->key_len); 473 /* If we have an iv can set it directly, otherwise use saved IV. */ 474 if (iv == NULL && gctx->iv_set) { 475 iv = gctx->iv; 476 } 477 if (iv) { 478 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 479 gctx->iv_set = 1; 480 } 481 gctx->key_set = 1; 482 } else { 483 /* If key set use IV, otherwise copy */ 484 if (gctx->key_set) { 485 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 486 } else { 487 memcpy(gctx->iv, iv, gctx->ivlen); 488 } 489 gctx->iv_set = 1; 490 gctx->iv_gen = 0; 491 } 492 return 1; 493 } 494 495 static void aes_gcm_cleanup(EVP_CIPHER_CTX *c) { 496 EVP_AES_GCM_CTX *gctx = c->cipher_data; 497 OPENSSL_cleanse(&gctx->gcm, sizeof(gctx->gcm)); 498 if (gctx->iv != c->iv) { 499 OPENSSL_free(gctx->iv); 500 } 501 } 502 503 /* increment counter (64-bit int) by 1 */ 504 static void ctr64_inc(uint8_t *counter) { 505 int n = 8; 506 uint8_t c; 507 508 do { 509 --n; 510 c = counter[n]; 511 ++c; 512 counter[n] = c; 513 if (c) { 514 return; 515 } 516 } while (n); 517 } 518 519 static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) { 520 EVP_AES_GCM_CTX *gctx = c->cipher_data; 521 switch (type) { 522 case EVP_CTRL_INIT: 523 gctx->key_set = 0; 524 gctx->iv_set = 0; 525 gctx->ivlen = c->cipher->iv_len; 526 gctx->iv = c->iv; 527 gctx->taglen = -1; 528 gctx->iv_gen = 0; 529 return 1; 530 531 case EVP_CTRL_GCM_SET_IVLEN: 532 if (arg <= 0) { 533 return 0; 534 } 535 536 /* Allocate memory for IV if needed */ 537 if (arg > EVP_MAX_IV_LENGTH && arg > gctx->ivlen) { 538 if (gctx->iv != c->iv) { 539 OPENSSL_free(gctx->iv); 540 } 541 gctx->iv = OPENSSL_malloc(arg); 542 if (!gctx->iv) { 543 return 0; 544 } 545 } 546 gctx->ivlen = arg; 547 return 1; 548 549 case EVP_CTRL_GCM_SET_TAG: 550 if (arg <= 0 || arg > 16 || c->encrypt) { 551 return 0; 552 } 553 memcpy(c->buf, ptr, arg); 554 gctx->taglen = arg; 555 return 1; 556 557 case EVP_CTRL_GCM_GET_TAG: 558 if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0) { 559 return 0; 560 } 561 memcpy(ptr, c->buf, arg); 562 return 1; 563 564 case EVP_CTRL_GCM_SET_IV_FIXED: 565 /* Special case: -1 length restores whole IV */ 566 if (arg == -1) { 567 memcpy(gctx->iv, ptr, gctx->ivlen); 568 gctx->iv_gen = 1; 569 return 1; 570 } 571 /* Fixed field must be at least 4 bytes and invocation field 572 * at least 8. */ 573 if (arg < 4 || (gctx->ivlen - arg) < 8) { 574 return 0; 575 } 576 if (arg) { 577 memcpy(gctx->iv, ptr, arg); 578 } 579 if (c->encrypt && !RAND_bytes(gctx->iv + arg, gctx->ivlen - arg)) { 580 return 0; 581 } 582 gctx->iv_gen = 1; 583 return 1; 584 585 case EVP_CTRL_GCM_IV_GEN: 586 if (gctx->iv_gen == 0 || gctx->key_set == 0) { 587 return 0; 588 } 589 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen); 590 if (arg <= 0 || arg > gctx->ivlen) { 591 arg = gctx->ivlen; 592 } 593 memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg); 594 /* Invocation field will be at least 8 bytes in size and 595 * so no need to check wrap around or increment more than 596 * last 8 bytes. */ 597 ctr64_inc(gctx->iv + gctx->ivlen - 8); 598 gctx->iv_set = 1; 599 return 1; 600 601 case EVP_CTRL_GCM_SET_IV_INV: 602 if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt) { 603 return 0; 604 } 605 memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg); 606 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen); 607 gctx->iv_set = 1; 608 return 1; 609 610 case EVP_CTRL_COPY: { 611 EVP_CIPHER_CTX *out = ptr; 612 EVP_AES_GCM_CTX *gctx_out = out->cipher_data; 613 if (gctx->gcm.key) { 614 if (gctx->gcm.key != &gctx->ks) { 615 return 0; 616 } 617 gctx_out->gcm.key = &gctx_out->ks; 618 } 619 if (gctx->iv == c->iv) { 620 gctx_out->iv = out->iv; 621 } else { 622 gctx_out->iv = OPENSSL_malloc(gctx->ivlen); 623 if (!gctx_out->iv) { 624 return 0; 625 } 626 memcpy(gctx_out->iv, gctx->iv, gctx->ivlen); 627 } 628 return 1; 629 } 630 631 default: 632 return -1; 633 } 634 } 635 636 static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 637 size_t len) { 638 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 639 640 /* If not set up, return error */ 641 if (!gctx->key_set) { 642 return -1; 643 } 644 if (!gctx->iv_set) { 645 return -1; 646 } 647 648 if (in) { 649 if (out == NULL) { 650 if (!CRYPTO_gcm128_aad(&gctx->gcm, in, len)) { 651 return -1; 652 } 653 } else if (ctx->encrypt) { 654 if (gctx->ctr) { 655 size_t bulk = 0; 656 #if defined(AES_GCM_ASM) 657 if (len >= 32 && AES_GCM_ASM(gctx)) { 658 size_t res = (16 - gctx->gcm.mres) % 16; 659 660 if (!CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, res)) { 661 return -1; 662 } 663 664 bulk = AES_gcm_encrypt(in + res, out + res, len - res, gctx->gcm.key, 665 gctx->gcm.Yi.c, gctx->gcm.Xi.u); 666 gctx->gcm.len.u[1] += bulk; 667 bulk += res; 668 } 669 #endif 670 if (!CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in + bulk, out + bulk, 671 len - bulk, gctx->ctr)) { 672 return -1; 673 } 674 } else { 675 size_t bulk = 0; 676 if (!CRYPTO_gcm128_encrypt(&gctx->gcm, in + bulk, out + bulk, 677 len - bulk)) { 678 return -1; 679 } 680 } 681 } else { 682 if (gctx->ctr) { 683 size_t bulk = 0; 684 #if defined(AES_GCM_ASM) 685 if (len >= 16 && AES_GCM_ASM(gctx)) { 686 size_t res = (16 - gctx->gcm.mres) % 16; 687 688 if (!CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, res)) { 689 return -1; 690 } 691 692 bulk = AES_gcm_decrypt(in + res, out + res, len - res, gctx->gcm.key, 693 gctx->gcm.Yi.c, gctx->gcm.Xi.u); 694 gctx->gcm.len.u[1] += bulk; 695 bulk += res; 696 } 697 #endif 698 if (!CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in + bulk, out + bulk, 699 len - bulk, gctx->ctr)) { 700 return -1; 701 } 702 } else { 703 size_t bulk = 0; 704 if (!CRYPTO_gcm128_decrypt(&gctx->gcm, in + bulk, out + bulk, 705 len - bulk)) { 706 return -1; 707 } 708 } 709 } 710 return len; 711 } else { 712 if (!ctx->encrypt) { 713 if (gctx->taglen < 0 || 714 !CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf, gctx->taglen) != 0) { 715 return -1; 716 } 717 gctx->iv_set = 0; 718 return 0; 719 } 720 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16); 721 gctx->taglen = 16; 722 /* Don't reuse the IV */ 723 gctx->iv_set = 0; 724 return 0; 725 } 726 } 727 728 static const EVP_CIPHER aes_128_cbc = { 729 NID_aes_128_cbc, 16 /* block_size */, 16 /* key_size */, 730 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 731 NULL /* app_data */, aes_init_key, aes_cbc_cipher, 732 NULL /* cleanup */, NULL /* ctrl */}; 733 734 static const EVP_CIPHER aes_128_ctr = { 735 NID_aes_128_ctr, 1 /* block_size */, 16 /* key_size */, 736 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 737 NULL /* app_data */, aes_init_key, aes_ctr_cipher, 738 NULL /* cleanup */, NULL /* ctrl */}; 739 740 static const EVP_CIPHER aes_128_ecb = { 741 NID_aes_128_ecb, 16 /* block_size */, 16 /* key_size */, 742 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 743 NULL /* app_data */, aes_init_key, aes_ecb_cipher, 744 NULL /* cleanup */, NULL /* ctrl */}; 745 746 static const EVP_CIPHER aes_128_ofb = { 747 NID_aes_128_ofb128, 1 /* block_size */, 16 /* key_size */, 748 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE, 749 NULL /* app_data */, aes_init_key, aes_ofb_cipher, 750 NULL /* cleanup */, NULL /* ctrl */}; 751 752 static const EVP_CIPHER aes_128_gcm = { 753 NID_aes_128_gcm, 1 /* block_size */, 16 /* key_size */, 12 /* iv_len */, 754 sizeof(EVP_AES_GCM_CTX), 755 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 756 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | 757 EVP_CIPH_FLAG_AEAD_CIPHER, 758 NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 759 aes_gcm_ctrl}; 760 761 762 static const EVP_CIPHER aes_192_cbc = { 763 NID_aes_192_cbc, 16 /* block_size */, 24 /* key_size */, 764 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 765 NULL /* app_data */, aes_init_key, aes_cbc_cipher, 766 NULL /* cleanup */, NULL /* ctrl */}; 767 768 static const EVP_CIPHER aes_192_ctr = { 769 NID_aes_192_ctr, 1 /* block_size */, 24 /* key_size */, 770 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 771 NULL /* app_data */, aes_init_key, aes_ctr_cipher, 772 NULL /* cleanup */, NULL /* ctrl */}; 773 774 static const EVP_CIPHER aes_192_ecb = { 775 NID_aes_192_ecb, 16 /* block_size */, 24 /* key_size */, 776 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 777 NULL /* app_data */, aes_init_key, aes_ecb_cipher, 778 NULL /* cleanup */, NULL /* ctrl */}; 779 780 static const EVP_CIPHER aes_192_gcm = { 781 NID_aes_192_gcm, 1 /* block_size */, 24 /* key_size */, 12 /* iv_len */, 782 sizeof(EVP_AES_GCM_CTX), 783 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 784 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | 785 EVP_CIPH_FLAG_AEAD_CIPHER, 786 NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 787 aes_gcm_ctrl}; 788 789 790 static const EVP_CIPHER aes_256_cbc = { 791 NID_aes_256_cbc, 16 /* block_size */, 32 /* key_size */, 792 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 793 NULL /* app_data */, aes_init_key, aes_cbc_cipher, 794 NULL /* cleanup */, NULL /* ctrl */}; 795 796 static const EVP_CIPHER aes_256_ctr = { 797 NID_aes_256_ctr, 1 /* block_size */, 32 /* key_size */, 798 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 799 NULL /* app_data */, aes_init_key, aes_ctr_cipher, 800 NULL /* cleanup */, NULL /* ctrl */}; 801 802 static const EVP_CIPHER aes_256_ecb = { 803 NID_aes_256_ecb, 16 /* block_size */, 32 /* key_size */, 804 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 805 NULL /* app_data */, aes_init_key, aes_ecb_cipher, 806 NULL /* cleanup */, NULL /* ctrl */}; 807 808 static const EVP_CIPHER aes_256_ofb = { 809 NID_aes_256_ofb128, 1 /* block_size */, 32 /* key_size */, 810 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE, 811 NULL /* app_data */, aes_init_key, aes_ofb_cipher, 812 NULL /* cleanup */, NULL /* ctrl */}; 813 814 static const EVP_CIPHER aes_256_gcm = { 815 NID_aes_256_gcm, 1 /* block_size */, 32 /* key_size */, 12 /* iv_len */, 816 sizeof(EVP_AES_GCM_CTX), 817 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 818 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | 819 EVP_CIPH_FLAG_AEAD_CIPHER, 820 NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 821 aes_gcm_ctrl}; 822 823 #if !defined(OPENSSL_NO_ASM) && \ 824 (defined(OPENSSL_X86_64) || defined(OPENSSL_X86)) 825 826 /* AES-NI section. */ 827 828 static char aesni_capable(void) { 829 return (OPENSSL_ia32cap_P[1] & (1 << (57 - 32))) != 0; 830 } 831 832 static int aesni_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 833 const uint8_t *iv, int enc) { 834 int ret, mode; 835 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 836 837 mode = ctx->cipher->flags & EVP_CIPH_MODE_MASK; 838 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && !enc) { 839 ret = aesni_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data); 840 dat->block = (block128_f)aesni_decrypt; 841 dat->stream.cbc = 842 mode == EVP_CIPH_CBC_MODE ? (cbc128_f)aesni_cbc_encrypt : NULL; 843 } else { 844 ret = aesni_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data); 845 dat->block = (block128_f)aesni_encrypt; 846 if (mode == EVP_CIPH_CBC_MODE) { 847 dat->stream.cbc = (cbc128_f)aesni_cbc_encrypt; 848 } else if (mode == EVP_CIPH_CTR_MODE) { 849 dat->stream.ctr = (ctr128_f)aesni_ctr32_encrypt_blocks; 850 } else { 851 dat->stream.cbc = NULL; 852 } 853 } 854 855 if (ret < 0) { 856 OPENSSL_PUT_ERROR(CIPHER, aesni_init_key, CIPHER_R_AES_KEY_SETUP_FAILED); 857 return 0; 858 } 859 860 return 1; 861 } 862 863 static int aesni_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, 864 const uint8_t *in, size_t len) { 865 aesni_cbc_encrypt(in, out, len, ctx->cipher_data, ctx->iv, ctx->encrypt); 866 867 return 1; 868 } 869 870 static int aesni_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, 871 const uint8_t *in, size_t len) { 872 size_t bl = ctx->cipher->block_size; 873 874 if (len < bl) { 875 return 1; 876 } 877 878 aesni_ecb_encrypt(in, out, len, ctx->cipher_data, ctx->encrypt); 879 880 return 1; 881 } 882 883 static int aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 884 const uint8_t *iv, int enc) { 885 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 886 if (!iv && !key) { 887 return 1; 888 } 889 if (key) { 890 aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks.ks); 891 CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, (block128_f)aesni_encrypt); 892 gctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks; 893 /* If we have an iv can set it directly, otherwise use 894 * saved IV. */ 895 if (iv == NULL && gctx->iv_set) { 896 iv = gctx->iv; 897 } 898 if (iv) { 899 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 900 gctx->iv_set = 1; 901 } 902 gctx->key_set = 1; 903 } else { 904 /* If key set use IV, otherwise copy */ 905 if (gctx->key_set) { 906 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 907 } else { 908 memcpy(gctx->iv, iv, gctx->ivlen); 909 } 910 gctx->iv_set = 1; 911 gctx->iv_gen = 0; 912 } 913 return 1; 914 } 915 916 static const EVP_CIPHER aesni_128_cbc = { 917 NID_aes_128_cbc, 16 /* block_size */, 16 /* key_size */, 918 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 919 NULL /* app_data */, aesni_init_key, aesni_cbc_cipher, 920 NULL /* cleanup */, NULL /* ctrl */}; 921 922 static const EVP_CIPHER aesni_128_ctr = { 923 NID_aes_128_ctr, 1 /* block_size */, 16 /* key_size */, 924 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 925 NULL /* app_data */, aesni_init_key, aes_ctr_cipher, 926 NULL /* cleanup */, NULL /* ctrl */}; 927 928 static const EVP_CIPHER aesni_128_ecb = { 929 NID_aes_128_ecb, 16 /* block_size */, 16 /* key_size */, 930 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 931 NULL /* app_data */, aesni_init_key, aesni_ecb_cipher, 932 NULL /* cleanup */, NULL /* ctrl */}; 933 934 static const EVP_CIPHER aesni_128_ofb = { 935 NID_aes_128_ofb128, 1 /* block_size */, 16 /* key_size */, 936 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE, 937 NULL /* app_data */, aesni_init_key, aes_ofb_cipher, 938 NULL /* cleanup */, NULL /* ctrl */}; 939 940 static const EVP_CIPHER aesni_128_gcm = { 941 NID_aes_128_gcm, 1 /* block_size */, 16 /* key_size */, 12 /* iv_len */, 942 sizeof(EVP_AES_GCM_CTX), 943 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 944 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | 945 EVP_CIPH_FLAG_AEAD_CIPHER, 946 NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 947 aes_gcm_ctrl}; 948 949 950 static const EVP_CIPHER aesni_192_cbc = { 951 NID_aes_192_cbc, 16 /* block_size */, 24 /* key_size */, 952 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 953 NULL /* app_data */, aesni_init_key, aesni_cbc_cipher, 954 NULL /* cleanup */, NULL /* ctrl */}; 955 956 static const EVP_CIPHER aesni_192_ctr = { 957 NID_aes_192_ctr, 1 /* block_size */, 24 /* key_size */, 958 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 959 NULL /* app_data */, aesni_init_key, aes_ctr_cipher, 960 NULL /* cleanup */, NULL /* ctrl */}; 961 962 static const EVP_CIPHER aesni_192_ecb = { 963 NID_aes_192_ecb, 16 /* block_size */, 24 /* key_size */, 964 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 965 NULL /* app_data */, aesni_init_key, aesni_ecb_cipher, 966 NULL /* cleanup */, NULL /* ctrl */}; 967 968 static const EVP_CIPHER aesni_192_gcm = { 969 NID_aes_192_gcm, 1 /* block_size */, 24 /* key_size */, 12 /* iv_len */, 970 sizeof(EVP_AES_GCM_CTX), 971 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 972 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | 973 EVP_CIPH_FLAG_AEAD_CIPHER, 974 NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 975 aes_gcm_ctrl}; 976 977 978 static const EVP_CIPHER aesni_256_cbc = { 979 NID_aes_256_cbc, 16 /* block_size */, 32 /* key_size */, 980 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE, 981 NULL /* app_data */, aesni_init_key, aesni_cbc_cipher, 982 NULL /* cleanup */, NULL /* ctrl */}; 983 984 static const EVP_CIPHER aesni_256_ctr = { 985 NID_aes_256_ctr, 1 /* block_size */, 32 /* key_size */, 986 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE, 987 NULL /* app_data */, aesni_init_key, aes_ctr_cipher, 988 NULL /* cleanup */, NULL /* ctrl */}; 989 990 static const EVP_CIPHER aesni_256_ecb = { 991 NID_aes_256_ecb, 16 /* block_size */, 32 /* key_size */, 992 0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE, 993 NULL /* app_data */, aesni_init_key, aesni_ecb_cipher, 994 NULL /* cleanup */, NULL /* ctrl */}; 995 996 static const EVP_CIPHER aesni_256_ofb = { 997 NID_aes_256_ofb128, 1 /* block_size */, 32 /* key_size */, 998 16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE, 999 NULL /* app_data */, aesni_init_key, aes_ofb_cipher, 1000 NULL /* cleanup */, NULL /* ctrl */}; 1001 1002 static const EVP_CIPHER aesni_256_gcm = { 1003 NID_aes_256_gcm, 1 /* block_size */, 32 /* key_size */, 12 /* iv_len */, 1004 sizeof(EVP_AES_GCM_CTX), 1005 EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | 1006 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY | 1007 EVP_CIPH_FLAG_AEAD_CIPHER, 1008 NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup, 1009 aes_gcm_ctrl}; 1010 1011 #define EVP_CIPHER_FUNCTION(keybits, mode) \ 1012 const EVP_CIPHER *EVP_aes_##keybits##_##mode(void) { \ 1013 if (aesni_capable()) { \ 1014 return &aesni_##keybits##_##mode; \ 1015 } else { \ 1016 return &aes_##keybits##_##mode; \ 1017 } \ 1018 } 1019 1020 #else /* ^^^ OPENSSL_X86_64 || OPENSSL_X86 */ 1021 1022 static char aesni_capable(void) { 1023 return 0; 1024 } 1025 1026 #define EVP_CIPHER_FUNCTION(keybits, mode) \ 1027 const EVP_CIPHER *EVP_aes_##keybits##_##mode(void) { \ 1028 return &aes_##keybits##_##mode; \ 1029 } 1030 1031 #endif 1032 1033 EVP_CIPHER_FUNCTION(128, cbc) 1034 EVP_CIPHER_FUNCTION(128, ctr) 1035 EVP_CIPHER_FUNCTION(128, ecb) 1036 EVP_CIPHER_FUNCTION(128, ofb) 1037 EVP_CIPHER_FUNCTION(128, gcm) 1038 1039 EVP_CIPHER_FUNCTION(192, cbc) 1040 EVP_CIPHER_FUNCTION(192, ctr) 1041 EVP_CIPHER_FUNCTION(192, ecb) 1042 EVP_CIPHER_FUNCTION(192, gcm) 1043 1044 EVP_CIPHER_FUNCTION(256, cbc) 1045 EVP_CIPHER_FUNCTION(256, ctr) 1046 EVP_CIPHER_FUNCTION(256, ecb) 1047 EVP_CIPHER_FUNCTION(256, ofb) 1048 EVP_CIPHER_FUNCTION(256, gcm) 1049 1050 1051 #define EVP_AEAD_AES_GCM_TAG_LEN 16 1052 1053 struct aead_aes_gcm_ctx { 1054 union { 1055 double align; 1056 AES_KEY ks; 1057 } ks; 1058 GCM128_CONTEXT gcm; 1059 ctr128_f ctr; 1060 uint8_t tag_len; 1061 }; 1062 1063 static int aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const uint8_t *key, 1064 size_t key_len, size_t tag_len) { 1065 struct aead_aes_gcm_ctx *gcm_ctx; 1066 const size_t key_bits = key_len * 8; 1067 1068 if (key_bits != 128 && key_bits != 256) { 1069 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_init, CIPHER_R_BAD_KEY_LENGTH); 1070 return 0; /* EVP_AEAD_CTX_init should catch this. */ 1071 } 1072 1073 if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { 1074 tag_len = EVP_AEAD_AES_GCM_TAG_LEN; 1075 } 1076 1077 if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) { 1078 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_init, CIPHER_R_TAG_TOO_LARGE); 1079 return 0; 1080 } 1081 1082 gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx)); 1083 if (gcm_ctx == NULL) { 1084 return 0; 1085 } 1086 1087 gcm_ctx->ctr = 1088 aes_ctr_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, NULL, key, key_len); 1089 gcm_ctx->tag_len = tag_len; 1090 ctx->aead_state = gcm_ctx; 1091 1092 return 1; 1093 } 1094 1095 static void aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx) { 1096 struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1097 OPENSSL_cleanse(gcm_ctx, sizeof(struct aead_aes_gcm_ctx)); 1098 OPENSSL_free(gcm_ctx); 1099 } 1100 1101 static int aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, uint8_t *out, 1102 size_t *out_len, size_t max_out_len, 1103 const uint8_t *nonce, size_t nonce_len, 1104 const uint8_t *in, size_t in_len, 1105 const uint8_t *ad, size_t ad_len) { 1106 size_t bulk = 0; 1107 const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1108 GCM128_CONTEXT gcm; 1109 1110 if (in_len + gcm_ctx->tag_len < in_len) { 1111 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_seal, CIPHER_R_TOO_LARGE); 1112 return 0; 1113 } 1114 1115 if (max_out_len < in_len + gcm_ctx->tag_len) { 1116 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_seal, CIPHER_R_BUFFER_TOO_SMALL); 1117 return 0; 1118 } 1119 1120 memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); 1121 CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); 1122 1123 if (ad_len > 0 && !CRYPTO_gcm128_aad(&gcm, ad, ad_len)) { 1124 return 0; 1125 } 1126 1127 if (gcm_ctx->ctr) { 1128 if (!CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk, in_len - bulk, 1129 gcm_ctx->ctr)) { 1130 return 0; 1131 } 1132 } else { 1133 if (!CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk, in_len - bulk)) { 1134 return 0; 1135 } 1136 } 1137 1138 CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len); 1139 *out_len = in_len + gcm_ctx->tag_len; 1140 return 1; 1141 } 1142 1143 static int aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, uint8_t *out, 1144 size_t *out_len, size_t max_out_len, 1145 const uint8_t *nonce, size_t nonce_len, 1146 const uint8_t *in, size_t in_len, 1147 const uint8_t *ad, size_t ad_len) { 1148 size_t bulk = 0; 1149 const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1150 uint8_t tag[EVP_AEAD_AES_GCM_TAG_LEN]; 1151 size_t plaintext_len; 1152 GCM128_CONTEXT gcm; 1153 1154 if (in_len < gcm_ctx->tag_len) { 1155 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BAD_DECRYPT); 1156 return 0; 1157 } 1158 1159 plaintext_len = in_len - gcm_ctx->tag_len; 1160 1161 if (max_out_len < plaintext_len) { 1162 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BUFFER_TOO_SMALL); 1163 return 0; 1164 } 1165 1166 memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); 1167 CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); 1168 1169 if (!CRYPTO_gcm128_aad(&gcm, ad, ad_len)) { 1170 return 0; 1171 } 1172 1173 if (gcm_ctx->ctr) { 1174 if (!CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk, 1175 in_len - bulk - gcm_ctx->tag_len, 1176 gcm_ctx->ctr)) { 1177 return 0; 1178 } 1179 } else { 1180 if (!CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk, 1181 in_len - bulk - gcm_ctx->tag_len)) { 1182 return 0; 1183 } 1184 } 1185 1186 CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len); 1187 if (CRYPTO_memcmp(tag, in + plaintext_len, gcm_ctx->tag_len) != 0) { 1188 OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BAD_DECRYPT); 1189 return 0; 1190 } 1191 1192 *out_len = plaintext_len; 1193 return 1; 1194 } 1195 1196 static const EVP_AEAD aead_aes_128_gcm = { 1197 16, /* key len */ 1198 12, /* nonce len */ 1199 EVP_AEAD_AES_GCM_TAG_LEN, /* overhead */ 1200 EVP_AEAD_AES_GCM_TAG_LEN, /* max tag length */ 1201 aead_aes_gcm_init, 1202 NULL, /* init_with_direction */ 1203 aead_aes_gcm_cleanup, 1204 aead_aes_gcm_seal, 1205 aead_aes_gcm_open, 1206 NULL, /* get_rc4_state */ 1207 }; 1208 1209 static const EVP_AEAD aead_aes_256_gcm = { 1210 32, /* key len */ 1211 12, /* nonce len */ 1212 EVP_AEAD_AES_GCM_TAG_LEN, /* overhead */ 1213 EVP_AEAD_AES_GCM_TAG_LEN, /* max tag length */ 1214 aead_aes_gcm_init, 1215 NULL, /* init_with_direction */ 1216 aead_aes_gcm_cleanup, 1217 aead_aes_gcm_seal, 1218 aead_aes_gcm_open, 1219 NULL, /* get_rc4_state */ 1220 }; 1221 1222 const EVP_AEAD *EVP_aead_aes_128_gcm(void) { return &aead_aes_128_gcm; } 1223 1224 const EVP_AEAD *EVP_aead_aes_256_gcm(void) { return &aead_aes_256_gcm; } 1225 1226 1227 /* AES Key Wrap is specified in 1228 * http://csrc.nist.gov/groups/ST/toolkit/documents/kms/key-wrap.pdf 1229 * or https://tools.ietf.org/html/rfc3394 */ 1230 1231 struct aead_aes_key_wrap_ctx { 1232 uint8_t key[32]; 1233 unsigned key_bits; 1234 }; 1235 1236 static int aead_aes_key_wrap_init(EVP_AEAD_CTX *ctx, const uint8_t *key, 1237 size_t key_len, size_t tag_len) { 1238 struct aead_aes_key_wrap_ctx *kw_ctx; 1239 const size_t key_bits = key_len * 8; 1240 1241 if (key_bits != 128 && key_bits != 256) { 1242 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, CIPHER_R_BAD_KEY_LENGTH); 1243 return 0; /* EVP_AEAD_CTX_init should catch this. */ 1244 } 1245 1246 if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { 1247 tag_len = 8; 1248 } 1249 1250 if (tag_len != 8) { 1251 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, 1252 CIPHER_R_UNSUPPORTED_TAG_SIZE); 1253 return 0; 1254 } 1255 1256 kw_ctx = OPENSSL_malloc(sizeof(struct aead_aes_key_wrap_ctx)); 1257 if (kw_ctx == NULL) { 1258 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, ERR_R_MALLOC_FAILURE); 1259 return 0; 1260 } 1261 1262 memcpy(kw_ctx->key, key, key_len); 1263 kw_ctx->key_bits = key_bits; 1264 1265 ctx->aead_state = kw_ctx; 1266 return 1; 1267 } 1268 1269 static void aead_aes_key_wrap_cleanup(EVP_AEAD_CTX *ctx) { 1270 struct aead_aes_key_wrap_ctx *kw_ctx = ctx->aead_state; 1271 OPENSSL_cleanse(kw_ctx, sizeof(struct aead_aes_key_wrap_ctx)); 1272 OPENSSL_free(kw_ctx); 1273 } 1274 1275 /* kDefaultAESKeyWrapNonce is the default nonce value given in 2.2.3.1. */ 1276 static const uint8_t kDefaultAESKeyWrapNonce[8] = {0xa6, 0xa6, 0xa6, 0xa6, 1277 0xa6, 0xa6, 0xa6, 0xa6}; 1278 1279 1280 static int aead_aes_key_wrap_seal(const EVP_AEAD_CTX *ctx, uint8_t *out, 1281 size_t *out_len, size_t max_out_len, 1282 const uint8_t *nonce, size_t nonce_len, 1283 const uint8_t *in, size_t in_len, 1284 const uint8_t *ad, size_t ad_len) { 1285 const struct aead_aes_key_wrap_ctx *kw_ctx = ctx->aead_state; 1286 union { 1287 double align; 1288 AES_KEY ks; 1289 } ks; 1290 /* Variables in this function match up with the variables in the second half 1291 * of section 2.2.1. */ 1292 unsigned i, j, n; 1293 uint8_t A[AES_BLOCK_SIZE]; 1294 1295 if (ad_len != 0) { 1296 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1297 CIPHER_R_UNSUPPORTED_AD_SIZE); 1298 return 0; 1299 } 1300 1301 if (nonce_len == 0) { 1302 nonce = kDefaultAESKeyWrapNonce; 1303 nonce_len = sizeof(kDefaultAESKeyWrapNonce); 1304 } 1305 1306 if (nonce_len != 8) { 1307 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1308 CIPHER_R_UNSUPPORTED_NONCE_SIZE); 1309 return 0; 1310 } 1311 1312 if (in_len % 8 != 0) { 1313 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1314 CIPHER_R_UNSUPPORTED_INPUT_SIZE); 1315 return 0; 1316 } 1317 1318 /* The code below only handles a 32-bit |t| thus 6*|n| must be less than 1319 * 2^32, where |n| is |in_len| / 8. So in_len < 4/3 * 2^32 and we 1320 * conservatively cap it to 2^32-16 to stop 32-bit platforms complaining that 1321 * a comparison is always true. */ 1322 if (in_len > 0xfffffff0) { 1323 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, CIPHER_R_TOO_LARGE); 1324 return 0; 1325 } 1326 1327 n = in_len / 8; 1328 1329 if (n < 2) { 1330 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1331 CIPHER_R_UNSUPPORTED_INPUT_SIZE); 1332 return 0; 1333 } 1334 1335 if (in_len + 8 < in_len) { 1336 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, CIPHER_R_TOO_LARGE); 1337 return 0; 1338 } 1339 1340 if (max_out_len < in_len + 8) { 1341 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1342 CIPHER_R_BUFFER_TOO_SMALL); 1343 return 0; 1344 } 1345 1346 if (AES_set_encrypt_key(kw_ctx->key, kw_ctx->key_bits, &ks.ks) < 0) { 1347 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, 1348 CIPHER_R_AES_KEY_SETUP_FAILED); 1349 return 0; 1350 } 1351 1352 memmove(out + 8, in, in_len); 1353 memcpy(A, nonce, 8); 1354 1355 for (j = 0; j < 6; j++) { 1356 for (i = 1; i <= n; i++) { 1357 uint32_t t; 1358 1359 memcpy(A + 8, out + 8 * i, 8); 1360 AES_encrypt(A, A, &ks.ks); 1361 t = n * j + i; 1362 A[7] ^= t & 0xff; 1363 A[6] ^= (t >> 8) & 0xff; 1364 A[5] ^= (t >> 16) & 0xff; 1365 A[4] ^= (t >> 24) & 0xff; 1366 memcpy(out + 8 * i, A + 8, 8); 1367 } 1368 } 1369 1370 memcpy(out, A, 8); 1371 *out_len = in_len + 8; 1372 return 1; 1373 } 1374 1375 static int aead_aes_key_wrap_open(const EVP_AEAD_CTX *ctx, uint8_t *out, 1376 size_t *out_len, size_t max_out_len, 1377 const uint8_t *nonce, size_t nonce_len, 1378 const uint8_t *in, size_t in_len, 1379 const uint8_t *ad, size_t ad_len) { 1380 const struct aead_aes_key_wrap_ctx *kw_ctx = ctx->aead_state; 1381 union { 1382 double align; 1383 AES_KEY ks; 1384 } ks; 1385 /* Variables in this function match up with the variables in the second half 1386 * of section 2.2.1. */ 1387 unsigned i, j, n; 1388 uint8_t A[AES_BLOCK_SIZE]; 1389 1390 if (ad_len != 0) { 1391 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, 1392 CIPHER_R_UNSUPPORTED_AD_SIZE); 1393 return 0; 1394 } 1395 1396 if (nonce_len == 0) { 1397 nonce = kDefaultAESKeyWrapNonce; 1398 nonce_len = sizeof(kDefaultAESKeyWrapNonce); 1399 } 1400 1401 if (nonce_len != 8) { 1402 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, 1403 CIPHER_R_UNSUPPORTED_NONCE_SIZE); 1404 return 0; 1405 } 1406 1407 if (in_len % 8 != 0) { 1408 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, 1409 CIPHER_R_UNSUPPORTED_INPUT_SIZE); 1410 return 0; 1411 } 1412 1413 /* The code below only handles a 32-bit |t| thus 6*|n| must be less than 1414 * 2^32, where |n| is |in_len| / 8. So in_len < 4/3 * 2^32 and we 1415 * conservatively cap it to 2^32-8 to stop 32-bit platforms complaining that 1416 * a comparison is always true. */ 1417 if (in_len > 0xfffffff8) { 1418 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, CIPHER_R_TOO_LARGE); 1419 return 0; 1420 } 1421 1422 if (in_len < 24) { 1423 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, CIPHER_R_BAD_DECRYPT); 1424 return 0; 1425 } 1426 1427 n = (in_len / 8) - 1; 1428 1429 if (max_out_len < in_len - 8) { 1430 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, 1431 CIPHER_R_BUFFER_TOO_SMALL); 1432 return 0; 1433 } 1434 1435 if (AES_set_decrypt_key(kw_ctx->key, kw_ctx->key_bits, &ks.ks) < 0) { 1436 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, 1437 CIPHER_R_AES_KEY_SETUP_FAILED); 1438 return 0; 1439 } 1440 1441 memcpy(A, in, 8); 1442 memmove(out, in + 8, in_len - 8); 1443 1444 for (j = 5; j < 6; j--) { 1445 for (i = n; i > 0; i--) { 1446 uint32_t t; 1447 1448 t = n * j + i; 1449 A[7] ^= t & 0xff; 1450 A[6] ^= (t >> 8) & 0xff; 1451 A[5] ^= (t >> 16) & 0xff; 1452 A[4] ^= (t >> 24) & 0xff; 1453 memcpy(A + 8, out + 8 * (i - 1), 8); 1454 AES_decrypt(A, A, &ks.ks); 1455 memcpy(out + 8 * (i - 1), A + 8, 8); 1456 } 1457 } 1458 1459 if (CRYPTO_memcmp(A, nonce, 8) != 0) { 1460 OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, CIPHER_R_BAD_DECRYPT); 1461 return 0; 1462 } 1463 1464 *out_len = in_len - 8; 1465 return 1; 1466 } 1467 1468 static const EVP_AEAD aead_aes_128_key_wrap = { 1469 16, /* key len */ 1470 8, /* nonce len */ 1471 8, /* overhead */ 1472 8, /* max tag length */ 1473 aead_aes_key_wrap_init, 1474 NULL, /* init_with_direction */ 1475 aead_aes_key_wrap_cleanup, 1476 aead_aes_key_wrap_seal, 1477 aead_aes_key_wrap_open, 1478 NULL, /* get_rc4_state */ 1479 }; 1480 1481 static const EVP_AEAD aead_aes_256_key_wrap = { 1482 32, /* key len */ 1483 8, /* nonce len */ 1484 8, /* overhead */ 1485 8, /* max tag length */ 1486 aead_aes_key_wrap_init, 1487 NULL, /* init_with_direction */ 1488 aead_aes_key_wrap_cleanup, 1489 aead_aes_key_wrap_seal, 1490 aead_aes_key_wrap_open, 1491 NULL, /* get_rc4_state */ 1492 }; 1493 1494 const EVP_AEAD *EVP_aead_aes_128_key_wrap(void) { return &aead_aes_128_key_wrap; } 1495 1496 const EVP_AEAD *EVP_aead_aes_256_key_wrap(void) { return &aead_aes_256_key_wrap; } 1497 1498 1499 #define EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN SHA256_DIGEST_LENGTH 1500 #define EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN 12 1501 1502 struct aead_aes_ctr_hmac_sha256_ctx { 1503 union { 1504 double align; 1505 AES_KEY ks; 1506 } ks; 1507 ctr128_f ctr; 1508 block128_f block; 1509 SHA256_CTX inner_init_state; 1510 SHA256_CTX outer_init_state; 1511 uint8_t tag_len; 1512 }; 1513 1514 static void hmac_init(SHA256_CTX *out_inner, SHA256_CTX *out_outer, 1515 const uint8_t hmac_key[32]) { 1516 static const size_t hmac_key_len = 32; 1517 uint8_t block[SHA256_CBLOCK]; 1518 memcpy(block, hmac_key, hmac_key_len); 1519 memset(block + hmac_key_len, 0x36, sizeof(block) - hmac_key_len); 1520 1521 unsigned i; 1522 for (i = 0; i < hmac_key_len; i++) { 1523 block[i] ^= 0x36; 1524 } 1525 1526 SHA256_Init(out_inner); 1527 SHA256_Update(out_inner, block, sizeof(block)); 1528 1529 memset(block + hmac_key_len, 0x5c, sizeof(block) - hmac_key_len); 1530 for (i = 0; i < hmac_key_len; i++) { 1531 block[i] ^= (0x36 ^ 0x5c); 1532 } 1533 1534 SHA256_Init(out_outer); 1535 SHA256_Update(out_outer, block, sizeof(block)); 1536 } 1537 1538 static int aead_aes_ctr_hmac_sha256_init(EVP_AEAD_CTX *ctx, const uint8_t *key, 1539 size_t key_len, size_t tag_len) { 1540 struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx; 1541 static const size_t hmac_key_len = 32; 1542 1543 if (key_len < hmac_key_len) { 1544 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_init, 1545 CIPHER_R_BAD_KEY_LENGTH); 1546 return 0; /* EVP_AEAD_CTX_init should catch this. */ 1547 } 1548 1549 const size_t aes_key_len = key_len - hmac_key_len; 1550 if (aes_key_len != 16 && aes_key_len != 32) { 1551 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_init, 1552 CIPHER_R_BAD_KEY_LENGTH); 1553 return 0; /* EVP_AEAD_CTX_init should catch this. */ 1554 } 1555 1556 if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { 1557 tag_len = EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN; 1558 } 1559 1560 if (tag_len > EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN) { 1561 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_init, 1562 CIPHER_R_TAG_TOO_LARGE); 1563 return 0; 1564 } 1565 1566 aes_ctx = OPENSSL_malloc(sizeof(struct aead_aes_ctr_hmac_sha256_ctx)); 1567 if (aes_ctx == NULL) { 1568 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_init, 1569 ERR_R_MALLOC_FAILURE); 1570 return 0; 1571 } 1572 1573 aes_ctx->ctr = 1574 aes_ctr_set_key(&aes_ctx->ks.ks, NULL, &aes_ctx->block, key, aes_key_len); 1575 aes_ctx->tag_len = tag_len; 1576 hmac_init(&aes_ctx->inner_init_state, &aes_ctx->outer_init_state, 1577 key + aes_key_len); 1578 1579 ctx->aead_state = aes_ctx; 1580 1581 return 1; 1582 } 1583 1584 static void aead_aes_ctr_hmac_sha256_cleanup(EVP_AEAD_CTX *ctx) { 1585 struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state; 1586 OPENSSL_cleanse(aes_ctx, sizeof(struct aead_aes_ctr_hmac_sha256_ctx)); 1587 OPENSSL_free(aes_ctx); 1588 } 1589 1590 static void hmac_update_uint64(SHA256_CTX *sha256, uint64_t value) { 1591 unsigned i; 1592 uint8_t bytes[8]; 1593 1594 for (i = 0; i < sizeof(bytes); i++) { 1595 bytes[i] = value & 0xff; 1596 value >>= 8; 1597 } 1598 SHA256_Update(sha256, bytes, sizeof(bytes)); 1599 } 1600 1601 static void hmac_calculate(uint8_t out[SHA256_DIGEST_LENGTH], 1602 const SHA256_CTX *inner_init_state, 1603 const SHA256_CTX *outer_init_state, 1604 const uint8_t *ad, size_t ad_len, 1605 const uint8_t *nonce, const uint8_t *ciphertext, 1606 size_t ciphertext_len) { 1607 SHA256_CTX sha256; 1608 memcpy(&sha256, inner_init_state, sizeof(sha256)); 1609 hmac_update_uint64(&sha256, ad_len); 1610 hmac_update_uint64(&sha256, ciphertext_len); 1611 SHA256_Update(&sha256, nonce, EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN); 1612 SHA256_Update(&sha256, ad, ad_len); 1613 1614 /* Pad with zeros to the end of the SHA-256 block. */ 1615 const unsigned num_padding = 1616 (SHA256_CBLOCK - ((sizeof(uint64_t)*2 + 1617 EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN + ad_len) % 1618 SHA256_CBLOCK)) % 1619 SHA256_CBLOCK; 1620 uint8_t padding[SHA256_CBLOCK]; 1621 memset(padding, 0, num_padding); 1622 SHA256_Update(&sha256, padding, num_padding); 1623 1624 SHA256_Update(&sha256, ciphertext, ciphertext_len); 1625 1626 uint8_t inner_digest[SHA256_DIGEST_LENGTH]; 1627 SHA256_Final(inner_digest, &sha256); 1628 1629 memcpy(&sha256, outer_init_state, sizeof(sha256)); 1630 SHA256_Update(&sha256, inner_digest, sizeof(inner_digest)); 1631 SHA256_Final(out, &sha256); 1632 } 1633 1634 static void aead_aes_ctr_hmac_sha256_crypt( 1635 const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx, uint8_t *out, 1636 const uint8_t *in, size_t len, const uint8_t *nonce) { 1637 /* Since the AEAD operation is one-shot, keeping a buffer of unused keystream 1638 * bytes is pointless. However, |CRYPTO_ctr128_encrypt| requires it. */ 1639 uint8_t partial_block_buffer[AES_BLOCK_SIZE]; 1640 unsigned partial_block_offset = 0; 1641 memset(partial_block_buffer, 0, sizeof(partial_block_buffer)); 1642 1643 uint8_t counter[AES_BLOCK_SIZE]; 1644 memcpy(counter, nonce, EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN); 1645 memset(counter + EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN, 0, 4); 1646 1647 if (aes_ctx->ctr) { 1648 CRYPTO_ctr128_encrypt_ctr32(in, out, len, &aes_ctx->ks.ks, counter, 1649 partial_block_buffer, &partial_block_offset, 1650 aes_ctx->ctr); 1651 } else { 1652 CRYPTO_ctr128_encrypt(in, out, len, &aes_ctx->ks.ks, counter, 1653 partial_block_buffer, &partial_block_offset, 1654 aes_ctx->block); 1655 } 1656 } 1657 1658 static int aead_aes_ctr_hmac_sha256_seal(const EVP_AEAD_CTX *ctx, uint8_t *out, 1659 size_t *out_len, size_t max_out_len, 1660 const uint8_t *nonce, size_t nonce_len, 1661 const uint8_t *in, size_t in_len, 1662 const uint8_t *ad, size_t ad_len) { 1663 const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state; 1664 const uint64_t in_len_64 = in_len; 1665 1666 if (in_len + aes_ctx->tag_len < in_len || 1667 /* This input is so large it would overflow the 32-bit block counter. */ 1668 in_len_64 >= (OPENSSL_U64(1) << 32) * AES_BLOCK_SIZE) { 1669 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_seal, 1670 CIPHER_R_TOO_LARGE); 1671 return 0; 1672 } 1673 1674 if (max_out_len < in_len + aes_ctx->tag_len) { 1675 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_seal, 1676 CIPHER_R_BUFFER_TOO_SMALL); 1677 return 0; 1678 } 1679 1680 if (nonce_len != EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN) { 1681 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_seal, 1682 CIPHER_R_UNSUPPORTED_NONCE_SIZE); 1683 return 0; 1684 } 1685 1686 aead_aes_ctr_hmac_sha256_crypt(aes_ctx, out, in, in_len, nonce); 1687 1688 uint8_t hmac_result[SHA256_DIGEST_LENGTH]; 1689 hmac_calculate(hmac_result, &aes_ctx->inner_init_state, 1690 &aes_ctx->outer_init_state, ad, ad_len, nonce, out, in_len); 1691 memcpy(out + in_len, hmac_result, aes_ctx->tag_len); 1692 *out_len = in_len + aes_ctx->tag_len; 1693 1694 return 1; 1695 } 1696 1697 static int aead_aes_ctr_hmac_sha256_open(const EVP_AEAD_CTX *ctx, uint8_t *out, 1698 size_t *out_len, size_t max_out_len, 1699 const uint8_t *nonce, size_t nonce_len, 1700 const uint8_t *in, size_t in_len, 1701 const uint8_t *ad, size_t ad_len) { 1702 const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state; 1703 size_t plaintext_len; 1704 1705 if (in_len < aes_ctx->tag_len) { 1706 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_open, 1707 CIPHER_R_BAD_DECRYPT); 1708 return 0; 1709 } 1710 1711 plaintext_len = in_len - aes_ctx->tag_len; 1712 1713 if (max_out_len < plaintext_len) { 1714 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_open, 1715 CIPHER_R_BUFFER_TOO_SMALL); 1716 return 0; 1717 } 1718 1719 if (nonce_len != EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN) { 1720 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_open, 1721 CIPHER_R_UNSUPPORTED_NONCE_SIZE); 1722 return 0; 1723 } 1724 1725 uint8_t hmac_result[SHA256_DIGEST_LENGTH]; 1726 hmac_calculate(hmac_result, &aes_ctx->inner_init_state, 1727 &aes_ctx->outer_init_state, ad, ad_len, nonce, in, 1728 plaintext_len); 1729 if (CRYPTO_memcmp(hmac_result, in + plaintext_len, aes_ctx->tag_len) != 0) { 1730 OPENSSL_PUT_ERROR(CIPHER, aead_aes_ctr_hmac_sha256_open, 1731 CIPHER_R_BAD_DECRYPT); 1732 return 0; 1733 } 1734 1735 aead_aes_ctr_hmac_sha256_crypt(aes_ctx, out, in, plaintext_len, nonce); 1736 1737 *out_len = plaintext_len; 1738 return 1; 1739 } 1740 1741 static const EVP_AEAD aead_aes_128_ctr_hmac_sha256 = { 1742 16 /* AES key */ + 32 /* HMAC key */, 1743 12, /* nonce length */ 1744 EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* overhead */ 1745 EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* max tag length */ 1746 1747 aead_aes_ctr_hmac_sha256_init, 1748 NULL /* init_with_direction */, 1749 aead_aes_ctr_hmac_sha256_cleanup, 1750 aead_aes_ctr_hmac_sha256_seal, 1751 aead_aes_ctr_hmac_sha256_open, 1752 NULL /* get_rc4_state */, 1753 }; 1754 1755 static const EVP_AEAD aead_aes_256_ctr_hmac_sha256 = { 1756 32 /* AES key */ + 32 /* HMAC key */, 1757 12, /* nonce length */ 1758 EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* overhead */ 1759 EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* max tag length */ 1760 1761 aead_aes_ctr_hmac_sha256_init, 1762 NULL /* init_with_direction */, 1763 aead_aes_ctr_hmac_sha256_cleanup, 1764 aead_aes_ctr_hmac_sha256_seal, 1765 aead_aes_ctr_hmac_sha256_open, 1766 NULL /* get_rc4_state */, 1767 }; 1768 1769 const EVP_AEAD *EVP_aead_aes_128_ctr_hmac_sha256(void) { 1770 return &aead_aes_128_ctr_hmac_sha256; 1771 } 1772 1773 const EVP_AEAD *EVP_aead_aes_256_ctr_hmac_sha256(void) { 1774 return &aead_aes_256_ctr_hmac_sha256; 1775 } 1776 1777 int EVP_has_aes_hardware(void) { 1778 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64) 1779 return aesni_capable() && crypto_gcm_clmul_enabled(); 1780 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) 1781 return hwaes_capable() && (OPENSSL_armcap_P & ARMV8_PMULL); 1782 #else 1783 return 0; 1784 #endif 1785 } 1786
