1 /* $OpenBSD: e_aes.c,v 1.42 2020/06/05 18:44:42 tb Exp $ */ 2 /* ==================================================================== 3 * Copyright (c) 2001-2011 The OpenSSL Project. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * 3. All advertising materials mentioning features or use of this 18 * software must display the following acknowledgment: 19 * "This product includes software developed by the OpenSSL Project 20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 21 * 22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23 * endorse or promote products derived from this software without 24 * prior written permission. For written permission, please contact 25 * openssl-core@openssl.org. 26 * 27 * 5. Products derived from this software may not be called "OpenSSL" 28 * nor may "OpenSSL" appear in their names without prior written 29 * permission of the OpenSSL Project. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47 * OF THE POSSIBILITY OF SUCH DAMAGE. 48 * ==================================================================== 49 * 50 */ 51 52 #include <limits.h> 53 #include <stdlib.h> 54 #include <string.h> 55 56 #include <openssl/opensslconf.h> 57 58 #ifndef OPENSSL_NO_AES 59 #include <openssl/aes.h> 60 #include <openssl/err.h> 61 #include <openssl/evp.h> 62 63 #include "evp_locl.h" 64 #include "modes_lcl.h" 65 66 typedef struct { 67 AES_KEY ks; 68 block128_f block; 69 union { 70 cbc128_f cbc; 71 ctr128_f ctr; 72 } stream; 73 } EVP_AES_KEY; 74 75 typedef struct { 76 AES_KEY ks; /* AES key schedule to use */ 77 int key_set; /* Set if key initialised */ 78 int iv_set; /* Set if an iv is set */ 79 GCM128_CONTEXT gcm; 80 unsigned char *iv; /* Temporary IV store */ 81 int ivlen; /* IV length */ 82 int taglen; 83 int iv_gen; /* It is OK to generate IVs */ 84 int tls_aad_len; /* TLS AAD length */ 85 ctr128_f ctr; 86 } EVP_AES_GCM_CTX; 87 88 typedef struct { 89 AES_KEY ks1, ks2; /* AES key schedules to use */ 90 XTS128_CONTEXT xts; 91 void (*stream)(const unsigned char *in, unsigned char *out, 92 size_t length, const AES_KEY *key1, const AES_KEY *key2, 93 const unsigned char iv[16]); 94 } EVP_AES_XTS_CTX; 95 96 typedef struct { 97 AES_KEY ks; /* AES key schedule to use */ 98 int key_set; /* Set if key initialised */ 99 int iv_set; /* Set if an iv is set */ 100 int tag_set; /* Set if tag is valid */ 101 int len_set; /* Set if message length set */ 102 int L, M; /* L and M parameters from RFC3610 */ 103 CCM128_CONTEXT ccm; 104 ccm128_f str; 105 } EVP_AES_CCM_CTX; 106 107 #define MAXBITCHUNK ((size_t)1<<(sizeof(size_t)*8-4)) 108 109 #ifdef VPAES_ASM 110 int vpaes_set_encrypt_key(const unsigned char *userKey, int bits, 111 AES_KEY *key); 112 int vpaes_set_decrypt_key(const unsigned char *userKey, int bits, 113 AES_KEY *key); 114 115 void vpaes_encrypt(const unsigned char *in, unsigned char *out, 116 const AES_KEY *key); 117 void vpaes_decrypt(const unsigned char *in, unsigned char *out, 118 const AES_KEY *key); 119 120 void vpaes_cbc_encrypt(const unsigned char *in, unsigned char *out, 121 size_t length, const AES_KEY *key, unsigned char *ivec, int enc); 122 #endif 123 #ifdef BSAES_ASM 124 void bsaes_cbc_encrypt(const unsigned char *in, unsigned char *out, 125 size_t length, const AES_KEY *key, unsigned char ivec[16], int enc); 126 void bsaes_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out, 127 size_t len, const AES_KEY *key, const unsigned char ivec[16]); 128 void bsaes_xts_encrypt(const unsigned char *inp, unsigned char *out, 129 size_t len, const AES_KEY *key1, const AES_KEY *key2, 130 const unsigned char iv[16]); 131 void bsaes_xts_decrypt(const unsigned char *inp, unsigned char *out, 132 size_t len, const AES_KEY *key1, const AES_KEY *key2, 133 const unsigned char iv[16]); 134 #endif 135 #ifdef AES_CTR_ASM 136 void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out, 137 size_t blocks, const AES_KEY *key, 138 const unsigned char ivec[AES_BLOCK_SIZE]); 139 #endif 140 #ifdef AES_XTS_ASM 141 void AES_xts_encrypt(const char *inp, char *out, size_t len, 142 const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]); 143 void AES_xts_decrypt(const char *inp, char *out, size_t len, 144 const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]); 145 #endif 146 147 #if defined(AES_ASM) && ( \ 148 ((defined(__i386) || defined(__i386__) || \ 149 defined(_M_IX86)) && defined(OPENSSL_IA32_SSE2))|| \ 150 defined(__x86_64) || defined(__x86_64__) || \ 151 defined(_M_AMD64) || defined(_M_X64) || \ 152 defined(__INTEL__) ) 153 154 #include "x86_arch.h" 155 156 #ifdef VPAES_ASM 157 #define VPAES_CAPABLE (OPENSSL_cpu_caps() & CPUCAP_MASK_SSSE3) 158 #endif 159 #ifdef BSAES_ASM 160 #define BSAES_CAPABLE VPAES_CAPABLE 161 #endif 162 /* 163 * AES-NI section 164 */ 165 #define AESNI_CAPABLE (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI) 166 167 int aesni_set_encrypt_key(const unsigned char *userKey, int bits, 168 AES_KEY *key); 169 int aesni_set_decrypt_key(const unsigned char *userKey, int bits, 170 AES_KEY *key); 171 172 void aesni_encrypt(const unsigned char *in, unsigned char *out, 173 const AES_KEY *key); 174 void aesni_decrypt(const unsigned char *in, unsigned char *out, 175 const AES_KEY *key); 176 177 void aesni_ecb_encrypt(const unsigned char *in, unsigned char *out, 178 size_t length, const AES_KEY *key, int enc); 179 void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out, 180 size_t length, const AES_KEY *key, unsigned char *ivec, int enc); 181 182 void aesni_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out, 183 size_t blocks, const void *key, const unsigned char *ivec); 184 185 void aesni_xts_encrypt(const unsigned char *in, unsigned char *out, 186 size_t length, const AES_KEY *key1, const AES_KEY *key2, 187 const unsigned char iv[16]); 188 189 void aesni_xts_decrypt(const unsigned char *in, unsigned char *out, 190 size_t length, const AES_KEY *key1, const AES_KEY *key2, 191 const unsigned char iv[16]); 192 193 void aesni_ccm64_encrypt_blocks (const unsigned char *in, unsigned char *out, 194 size_t blocks, const void *key, const unsigned char ivec[16], 195 unsigned char cmac[16]); 196 197 void aesni_ccm64_decrypt_blocks (const unsigned char *in, unsigned char *out, 198 size_t blocks, const void *key, const unsigned char ivec[16], 199 unsigned char cmac[16]); 200 201 static int 202 aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 203 const unsigned char *iv, int enc) 204 { 205 int ret, mode; 206 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 207 208 mode = ctx->cipher->flags & EVP_CIPH_MODE; 209 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && 210 !enc) { 211 ret = aesni_set_decrypt_key(key, ctx->key_len * 8, 212 ctx->cipher_data); 213 dat->block = (block128_f)aesni_decrypt; 214 dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ? 215 (cbc128_f)aesni_cbc_encrypt : NULL; 216 } else { 217 ret = aesni_set_encrypt_key(key, ctx->key_len * 8, 218 ctx->cipher_data); 219 dat->block = (block128_f)aesni_encrypt; 220 if (mode == EVP_CIPH_CBC_MODE) 221 dat->stream.cbc = (cbc128_f)aesni_cbc_encrypt; 222 else if (mode == EVP_CIPH_CTR_MODE) 223 dat->stream.ctr = (ctr128_f)aesni_ctr32_encrypt_blocks; 224 else 225 dat->stream.cbc = NULL; 226 } 227 228 if (ret < 0) { 229 EVPerror(EVP_R_AES_KEY_SETUP_FAILED); 230 return 0; 231 } 232 233 return 1; 234 } 235 236 static int 237 aesni_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 238 const unsigned char *in, size_t len) 239 { 240 aesni_cbc_encrypt(in, out, len, ctx->cipher_data, ctx->iv, 241 ctx->encrypt); 242 243 return 1; 244 } 245 246 static int 247 aesni_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 248 const unsigned char *in, size_t len) 249 { 250 size_t bl = ctx->cipher->block_size; 251 252 if (len < bl) 253 return 1; 254 255 aesni_ecb_encrypt(in, out, len, ctx->cipher_data, ctx->encrypt); 256 257 return 1; 258 } 259 260 #define aesni_ofb_cipher aes_ofb_cipher 261 static int aesni_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 262 const unsigned char *in, size_t len); 263 264 #define aesni_cfb_cipher aes_cfb_cipher 265 static int aesni_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 266 const unsigned char *in, size_t len); 267 268 #define aesni_cfb8_cipher aes_cfb8_cipher 269 static int aesni_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 270 const unsigned char *in, size_t len); 271 272 #define aesni_cfb1_cipher aes_cfb1_cipher 273 static int aesni_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 274 const unsigned char *in, size_t len); 275 276 #define aesni_ctr_cipher aes_ctr_cipher 277 static int aesni_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 278 const unsigned char *in, size_t len); 279 280 static int 281 aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 282 const unsigned char *iv, int enc) 283 { 284 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 285 286 if (!iv && !key) 287 return 1; 288 if (key) { 289 aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks); 290 CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, 291 (block128_f)aesni_encrypt); 292 gctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks; 293 /* If we have an iv can set it directly, otherwise use 294 * saved IV. 295 */ 296 if (iv == NULL && gctx->iv_set) 297 iv = gctx->iv; 298 if (iv) { 299 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 300 gctx->iv_set = 1; 301 } 302 gctx->key_set = 1; 303 } else { 304 /* If key set use IV, otherwise copy */ 305 if (gctx->key_set) 306 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 307 else 308 memcpy(gctx->iv, iv, gctx->ivlen); 309 gctx->iv_set = 1; 310 gctx->iv_gen = 0; 311 } 312 return 1; 313 } 314 315 #define aesni_gcm_cipher aes_gcm_cipher 316 static int aesni_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 317 const unsigned char *in, size_t len); 318 319 static int 320 aesni_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 321 const unsigned char *iv, int enc) 322 { 323 EVP_AES_XTS_CTX *xctx = ctx->cipher_data; 324 325 if (!iv && !key) 326 return 1; 327 328 if (key) { 329 /* key_len is two AES keys */ 330 if (enc) { 331 aesni_set_encrypt_key(key, ctx->key_len * 4, 332 &xctx->ks1); 333 xctx->xts.block1 = (block128_f)aesni_encrypt; 334 xctx->stream = aesni_xts_encrypt; 335 } else { 336 aesni_set_decrypt_key(key, ctx->key_len * 4, 337 &xctx->ks1); 338 xctx->xts.block1 = (block128_f)aesni_decrypt; 339 xctx->stream = aesni_xts_decrypt; 340 } 341 342 aesni_set_encrypt_key(key + ctx->key_len / 2, 343 ctx->key_len * 4, &xctx->ks2); 344 xctx->xts.block2 = (block128_f)aesni_encrypt; 345 346 xctx->xts.key1 = &xctx->ks1; 347 } 348 349 if (iv) { 350 xctx->xts.key2 = &xctx->ks2; 351 memcpy(ctx->iv, iv, 16); 352 } 353 354 return 1; 355 } 356 357 #define aesni_xts_cipher aes_xts_cipher 358 static int aesni_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 359 const unsigned char *in, size_t len); 360 361 static int 362 aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 363 const unsigned char *iv, int enc) 364 { 365 EVP_AES_CCM_CTX *cctx = ctx->cipher_data; 366 367 if (!iv && !key) 368 return 1; 369 if (key) { 370 aesni_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks); 371 CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L, 372 &cctx->ks, (block128_f)aesni_encrypt); 373 cctx->str = enc ? (ccm128_f)aesni_ccm64_encrypt_blocks : 374 (ccm128_f)aesni_ccm64_decrypt_blocks; 375 cctx->key_set = 1; 376 } 377 if (iv) { 378 memcpy(ctx->iv, iv, 15 - cctx->L); 379 cctx->iv_set = 1; 380 } 381 return 1; 382 } 383 384 #define aesni_ccm_cipher aes_ccm_cipher 385 static int aesni_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 386 const unsigned char *in, size_t len); 387 388 #define BLOCK_CIPHER_generic(n,keylen,blocksize,ivlen,nmode,mode,MODE,fl) \ 389 static const EVP_CIPHER aesni_##keylen##_##mode = { \ 390 .nid = n##_##keylen##_##nmode, \ 391 .block_size = blocksize, \ 392 .key_len = keylen / 8, \ 393 .iv_len = ivlen, \ 394 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 395 .init = aesni_init_key, \ 396 .do_cipher = aesni_##mode##_cipher, \ 397 .ctx_size = sizeof(EVP_AES_KEY) \ 398 }; \ 399 static const EVP_CIPHER aes_##keylen##_##mode = { \ 400 .nid = n##_##keylen##_##nmode, \ 401 .block_size = blocksize, \ 402 .key_len = keylen / 8, \ 403 .iv_len = ivlen, \ 404 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 405 .init = aes_init_key, \ 406 .do_cipher = aes_##mode##_cipher, \ 407 .ctx_size = sizeof(EVP_AES_KEY) \ 408 }; \ 409 const EVP_CIPHER * \ 410 EVP_aes_##keylen##_##mode(void) \ 411 { \ 412 return AESNI_CAPABLE ? \ 413 &aesni_##keylen##_##mode : &aes_##keylen##_##mode; \ 414 } 415 416 #define BLOCK_CIPHER_custom(n,keylen,blocksize,ivlen,mode,MODE,fl) \ 417 static const EVP_CIPHER aesni_##keylen##_##mode = { \ 418 .nid = n##_##keylen##_##mode, \ 419 .block_size = blocksize, \ 420 .key_len = \ 421 (EVP_CIPH_##MODE##_MODE == EVP_CIPH_XTS_MODE ? 2 : 1) * \ 422 keylen / 8, \ 423 .iv_len = ivlen, \ 424 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 425 .init = aesni_##mode##_init_key, \ 426 .do_cipher = aesni_##mode##_cipher, \ 427 .cleanup = aes_##mode##_cleanup, \ 428 .ctx_size = sizeof(EVP_AES_##MODE##_CTX), \ 429 .ctrl = aes_##mode##_ctrl \ 430 }; \ 431 static const EVP_CIPHER aes_##keylen##_##mode = { \ 432 .nid = n##_##keylen##_##mode, \ 433 .block_size = blocksize, \ 434 .key_len = \ 435 (EVP_CIPH_##MODE##_MODE == EVP_CIPH_XTS_MODE ? 2 : 1) * \ 436 keylen / 8, \ 437 .iv_len = ivlen, \ 438 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 439 .init = aes_##mode##_init_key, \ 440 .do_cipher = aes_##mode##_cipher, \ 441 .cleanup = aes_##mode##_cleanup, \ 442 .ctx_size = sizeof(EVP_AES_##MODE##_CTX), \ 443 .ctrl = aes_##mode##_ctrl \ 444 }; \ 445 const EVP_CIPHER * \ 446 EVP_aes_##keylen##_##mode(void) \ 447 { \ 448 return AESNI_CAPABLE ? \ 449 &aesni_##keylen##_##mode : &aes_##keylen##_##mode; \ 450 } 451 452 #else 453 454 #define BLOCK_CIPHER_generic(n,keylen,blocksize,ivlen,nmode,mode,MODE,fl) \ 455 static const EVP_CIPHER aes_##keylen##_##mode = { \ 456 .nid = n##_##keylen##_##nmode, \ 457 .block_size = blocksize, \ 458 .key_len = keylen / 8, \ 459 .iv_len = ivlen, \ 460 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 461 .init = aes_init_key, \ 462 .do_cipher = aes_##mode##_cipher, \ 463 .ctx_size = sizeof(EVP_AES_KEY) \ 464 }; \ 465 const EVP_CIPHER * \ 466 EVP_aes_##keylen##_##mode(void) \ 467 { \ 468 return &aes_##keylen##_##mode; \ 469 } 470 471 #define BLOCK_CIPHER_custom(n,keylen,blocksize,ivlen,mode,MODE,fl) \ 472 static const EVP_CIPHER aes_##keylen##_##mode = { \ 473 .nid = n##_##keylen##_##mode, \ 474 .block_size = blocksize, \ 475 .key_len = \ 476 (EVP_CIPH_##MODE##_MODE == EVP_CIPH_XTS_MODE ? 2 : 1) * \ 477 keylen / 8, \ 478 .iv_len = ivlen, \ 479 .flags = fl | EVP_CIPH_##MODE##_MODE, \ 480 .init = aes_##mode##_init_key, \ 481 .do_cipher = aes_##mode##_cipher, \ 482 .cleanup = aes_##mode##_cleanup, \ 483 .ctx_size = sizeof(EVP_AES_##MODE##_CTX), \ 484 .ctrl = aes_##mode##_ctrl \ 485 }; \ 486 const EVP_CIPHER * \ 487 EVP_aes_##keylen##_##mode(void) \ 488 { \ 489 return &aes_##keylen##_##mode; \ 490 } 491 492 #endif 493 494 #define BLOCK_CIPHER_generic_pack(nid,keylen,flags) \ 495 BLOCK_CIPHER_generic(nid,keylen,16,16,cbc,cbc,CBC,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \ 496 BLOCK_CIPHER_generic(nid,keylen,16,0,ecb,ecb,ECB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \ 497 BLOCK_CIPHER_generic(nid,keylen,1,16,ofb128,ofb,OFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \ 498 BLOCK_CIPHER_generic(nid,keylen,1,16,cfb128,cfb,CFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \ 499 BLOCK_CIPHER_generic(nid,keylen,1,16,cfb1,cfb1,CFB,flags) \ 500 BLOCK_CIPHER_generic(nid,keylen,1,16,cfb8,cfb8,CFB,flags) \ 501 BLOCK_CIPHER_generic(nid,keylen,1,16,ctr,ctr,CTR,flags) 502 503 static int 504 aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 505 const unsigned char *iv, int enc) 506 { 507 int ret, mode; 508 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 509 510 mode = ctx->cipher->flags & EVP_CIPH_MODE; 511 if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && 512 !enc) 513 #ifdef BSAES_CAPABLE 514 if (BSAES_CAPABLE && mode == EVP_CIPH_CBC_MODE) { 515 ret = AES_set_decrypt_key(key, ctx->key_len * 8, 516 &dat->ks); 517 dat->block = (block128_f)AES_decrypt; 518 dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt; 519 } else 520 #endif 521 #ifdef VPAES_CAPABLE 522 if (VPAES_CAPABLE) { 523 ret = vpaes_set_decrypt_key(key, ctx->key_len * 8, 524 &dat->ks); 525 dat->block = (block128_f)vpaes_decrypt; 526 dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ? 527 (cbc128_f)vpaes_cbc_encrypt : NULL; 528 } else 529 #endif 530 { 531 ret = AES_set_decrypt_key(key, ctx->key_len * 8, 532 &dat->ks); 533 dat->block = (block128_f)AES_decrypt; 534 dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ? 535 (cbc128_f)AES_cbc_encrypt : NULL; 536 } else 537 #ifdef BSAES_CAPABLE 538 if (BSAES_CAPABLE && mode == EVP_CIPH_CTR_MODE) { 539 ret = AES_set_encrypt_key(key, ctx->key_len * 8, 540 &dat->ks); 541 dat->block = (block128_f)AES_encrypt; 542 dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks; 543 } else 544 #endif 545 #ifdef VPAES_CAPABLE 546 if (VPAES_CAPABLE) { 547 ret = vpaes_set_encrypt_key(key, ctx->key_len * 8, 548 &dat->ks); 549 dat->block = (block128_f)vpaes_encrypt; 550 dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ? 551 (cbc128_f)vpaes_cbc_encrypt : NULL; 552 } else 553 #endif 554 { 555 ret = AES_set_encrypt_key(key, ctx->key_len * 8, 556 &dat->ks); 557 dat->block = (block128_f)AES_encrypt; 558 dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ? 559 (cbc128_f)AES_cbc_encrypt : NULL; 560 #ifdef AES_CTR_ASM 561 if (mode == EVP_CIPH_CTR_MODE) 562 dat->stream.ctr = (ctr128_f)AES_ctr32_encrypt; 563 #endif 564 } 565 566 if (ret < 0) { 567 EVPerror(EVP_R_AES_KEY_SETUP_FAILED); 568 return 0; 569 } 570 571 return 1; 572 } 573 574 static int 575 aes_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 576 const unsigned char *in, size_t len) 577 { 578 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 579 580 if (dat->stream.cbc) 581 (*dat->stream.cbc)(in, out, len, &dat->ks, ctx->iv, 582 ctx->encrypt); 583 else if (ctx->encrypt) 584 CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv, 585 dat->block); 586 else 587 CRYPTO_cbc128_decrypt(in, out, len, &dat->ks, ctx->iv, 588 dat->block); 589 590 return 1; 591 } 592 593 static int 594 aes_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 595 const unsigned char *in, size_t len) 596 { 597 size_t bl = ctx->cipher->block_size; 598 size_t i; 599 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 600 601 if (len < bl) 602 return 1; 603 604 for (i = 0, len -= bl; i <= len; i += bl) 605 (*dat->block)(in + i, out + i, &dat->ks); 606 607 return 1; 608 } 609 610 static int 611 aes_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 612 const unsigned char *in, size_t len) 613 { 614 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 615 616 CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num, 617 dat->block); 618 return 1; 619 } 620 621 static int 622 aes_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 623 const unsigned char *in, size_t len) 624 { 625 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 626 627 CRYPTO_cfb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num, 628 ctx->encrypt, dat->block); 629 return 1; 630 } 631 632 static int 633 aes_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 634 const unsigned char *in, size_t len) 635 { 636 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 637 638 CRYPTO_cfb128_8_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num, 639 ctx->encrypt, dat->block); 640 return 1; 641 } 642 643 static int 644 aes_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 645 const unsigned char *in, size_t len) 646 { 647 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 648 649 if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) { 650 CRYPTO_cfb128_1_encrypt(in, out, len, &dat->ks, ctx->iv, 651 &ctx->num, ctx->encrypt, dat->block); 652 return 1; 653 } 654 655 while (len >= MAXBITCHUNK) { 656 CRYPTO_cfb128_1_encrypt(in, out, MAXBITCHUNK*8, &dat->ks, 657 ctx->iv, &ctx->num, ctx->encrypt, dat->block); 658 len -= MAXBITCHUNK; 659 } 660 if (len) 661 CRYPTO_cfb128_1_encrypt(in, out, len*8, &dat->ks, 662 ctx->iv, &ctx->num, ctx->encrypt, dat->block); 663 664 return 1; 665 } 666 667 static int aes_ctr_cipher (EVP_CIPHER_CTX *ctx, unsigned char *out, 668 const unsigned char *in, size_t len) 669 { 670 unsigned int num = ctx->num; 671 EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; 672 673 if (dat->stream.ctr) 674 CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks, 675 ctx->iv, ctx->buf, &num, dat->stream.ctr); 676 else 677 CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, 678 ctx->iv, ctx->buf, &num, dat->block); 679 ctx->num = (size_t)num; 680 return 1; 681 } 682 683 BLOCK_CIPHER_generic_pack(NID_aes, 128, EVP_CIPH_FLAG_FIPS) 684 BLOCK_CIPHER_generic_pack(NID_aes, 192, EVP_CIPH_FLAG_FIPS) 685 BLOCK_CIPHER_generic_pack(NID_aes, 256, EVP_CIPH_FLAG_FIPS) 686 687 static int 688 aes_gcm_cleanup(EVP_CIPHER_CTX *c) 689 { 690 EVP_AES_GCM_CTX *gctx = c->cipher_data; 691 692 if (gctx->iv != c->iv) 693 free(gctx->iv); 694 explicit_bzero(gctx, sizeof(*gctx)); 695 return 1; 696 } 697 698 /* increment counter (64-bit int) by 1 */ 699 static void 700 ctr64_inc(unsigned char *counter) 701 { 702 int n = 8; 703 unsigned char c; 704 705 do { 706 --n; 707 c = counter[n]; 708 ++c; 709 counter[n] = c; 710 if (c) 711 return; 712 } while (n); 713 } 714 715 static int 716 aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 717 { 718 EVP_AES_GCM_CTX *gctx = c->cipher_data; 719 720 switch (type) { 721 case EVP_CTRL_INIT: 722 gctx->key_set = 0; 723 gctx->iv_set = 0; 724 if (c->cipher->iv_len == 0) { 725 EVPerror(EVP_R_INVALID_IV_LENGTH); 726 return 0; 727 } 728 gctx->ivlen = c->cipher->iv_len; 729 gctx->iv = c->iv; 730 gctx->taglen = -1; 731 gctx->iv_gen = 0; 732 gctx->tls_aad_len = -1; 733 return 1; 734 735 case EVP_CTRL_GCM_SET_IVLEN: 736 if (arg <= 0) 737 return 0; 738 /* Allocate memory for IV if needed */ 739 if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen)) { 740 if (gctx->iv != c->iv) 741 free(gctx->iv); 742 gctx->iv = malloc(arg); 743 if (!gctx->iv) 744 return 0; 745 } 746 gctx->ivlen = arg; 747 return 1; 748 749 case EVP_CTRL_GCM_SET_TAG: 750 if (arg <= 0 || arg > 16 || c->encrypt) 751 return 0; 752 memcpy(c->buf, ptr, arg); 753 gctx->taglen = arg; 754 return 1; 755 756 case EVP_CTRL_GCM_GET_TAG: 757 if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0) 758 return 0; 759 memcpy(ptr, c->buf, arg); 760 return 1; 761 762 case EVP_CTRL_GCM_SET_IV_FIXED: 763 /* Special case: -1 length restores whole IV */ 764 if (arg == -1) { 765 memcpy(gctx->iv, ptr, gctx->ivlen); 766 gctx->iv_gen = 1; 767 return 1; 768 } 769 /* Fixed field must be at least 4 bytes and invocation field 770 * at least 8. 771 */ 772 if ((arg < 4) || (gctx->ivlen - arg) < 8) 773 return 0; 774 if (arg) 775 memcpy(gctx->iv, ptr, arg); 776 if (c->encrypt) 777 arc4random_buf(gctx->iv + arg, gctx->ivlen - arg); 778 gctx->iv_gen = 1; 779 return 1; 780 781 case EVP_CTRL_GCM_IV_GEN: 782 if (gctx->iv_gen == 0 || gctx->key_set == 0) 783 return 0; 784 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen); 785 if (arg <= 0 || arg > gctx->ivlen) 786 arg = gctx->ivlen; 787 memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg); 788 /* Invocation field will be at least 8 bytes in size and 789 * so no need to check wrap around or increment more than 790 * last 8 bytes. 791 */ 792 ctr64_inc(gctx->iv + gctx->ivlen - 8); 793 gctx->iv_set = 1; 794 return 1; 795 796 case EVP_CTRL_GCM_SET_IV_INV: 797 if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt) 798 return 0; 799 memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg); 800 CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen); 801 gctx->iv_set = 1; 802 return 1; 803 804 case EVP_CTRL_AEAD_TLS1_AAD: 805 /* Save the AAD for later use */ 806 if (arg != 13) 807 return 0; 808 memcpy(c->buf, ptr, arg); 809 gctx->tls_aad_len = arg; 810 { 811 unsigned int len = c->buf[arg - 2] << 8 | 812 c->buf[arg - 1]; 813 814 /* Correct length for explicit IV */ 815 if (len < EVP_GCM_TLS_EXPLICIT_IV_LEN) 816 return 0; 817 len -= EVP_GCM_TLS_EXPLICIT_IV_LEN; 818 819 /* If decrypting correct for tag too */ 820 if (!c->encrypt) { 821 if (len < EVP_GCM_TLS_TAG_LEN) 822 return 0; 823 len -= EVP_GCM_TLS_TAG_LEN; 824 } 825 c->buf[arg - 2] = len >> 8; 826 c->buf[arg - 1] = len & 0xff; 827 } 828 /* Extra padding: tag appended to record */ 829 return EVP_GCM_TLS_TAG_LEN; 830 831 case EVP_CTRL_COPY: 832 { 833 EVP_CIPHER_CTX *out = ptr; 834 EVP_AES_GCM_CTX *gctx_out = out->cipher_data; 835 836 if (gctx->gcm.key) { 837 if (gctx->gcm.key != &gctx->ks) 838 return 0; 839 gctx_out->gcm.key = &gctx_out->ks; 840 } 841 842 if (gctx->iv == c->iv) { 843 gctx_out->iv = out->iv; 844 } else { 845 if ((gctx_out->iv = calloc(1, gctx->ivlen)) == NULL) 846 return 0; 847 memcpy(gctx_out->iv, gctx->iv, gctx->ivlen); 848 } 849 return 1; 850 } 851 852 default: 853 return -1; 854 855 } 856 } 857 858 static ctr128_f 859 aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx, 860 const unsigned char *key, size_t key_len) 861 { 862 #ifdef BSAES_CAPABLE 863 if (BSAES_CAPABLE) { 864 AES_set_encrypt_key(key, key_len * 8, aes_key); 865 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); 866 return (ctr128_f)bsaes_ctr32_encrypt_blocks; 867 } else 868 #endif 869 #ifdef VPAES_CAPABLE 870 if (VPAES_CAPABLE) { 871 vpaes_set_encrypt_key(key, key_len * 8, aes_key); 872 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt); 873 return NULL; 874 } else 875 #endif 876 (void)0; /* terminate potentially open 'else' */ 877 878 AES_set_encrypt_key(key, key_len * 8, aes_key); 879 CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); 880 #ifdef AES_CTR_ASM 881 return (ctr128_f)AES_ctr32_encrypt; 882 #else 883 return NULL; 884 #endif 885 } 886 887 static int 888 aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 889 const unsigned char *iv, int enc) 890 { 891 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 892 893 if (!iv && !key) 894 return 1; 895 if (key) { 896 gctx->ctr = aes_gcm_set_key(&gctx->ks, &gctx->gcm, 897 key, ctx->key_len); 898 899 /* If we have an iv can set it directly, otherwise use 900 * saved IV. 901 */ 902 if (iv == NULL && gctx->iv_set) 903 iv = gctx->iv; 904 if (iv) { 905 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 906 gctx->iv_set = 1; 907 } 908 gctx->key_set = 1; 909 } else { 910 /* If key set use IV, otherwise copy */ 911 if (gctx->key_set) 912 CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen); 913 else 914 memcpy(gctx->iv, iv, gctx->ivlen); 915 gctx->iv_set = 1; 916 gctx->iv_gen = 0; 917 } 918 return 1; 919 } 920 921 /* Handle TLS GCM packet format. This consists of the last portion of the IV 922 * followed by the payload and finally the tag. On encrypt generate IV, 923 * encrypt payload and write the tag. On verify retrieve IV, decrypt payload 924 * and verify tag. 925 */ 926 927 static int 928 aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 929 const unsigned char *in, size_t len) 930 { 931 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 932 int rv = -1; 933 934 /* Encrypt/decrypt must be performed in place */ 935 if (out != in || 936 len < (EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN)) 937 return -1; 938 939 /* Set IV from start of buffer or generate IV and write to start 940 * of buffer. 941 */ 942 if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ? 943 EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV, 944 EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0) 945 goto err; 946 947 /* Use saved AAD */ 948 if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len)) 949 goto err; 950 951 /* Fix buffer and length to point to payload */ 952 in += EVP_GCM_TLS_EXPLICIT_IV_LEN; 953 out += EVP_GCM_TLS_EXPLICIT_IV_LEN; 954 len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN; 955 if (ctx->encrypt) { 956 /* Encrypt payload */ 957 if (gctx->ctr) { 958 if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in, out, 959 len, gctx->ctr)) 960 goto err; 961 } else { 962 if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len)) 963 goto err; 964 } 965 out += len; 966 967 /* Finally write tag */ 968 CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN); 969 rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN; 970 } else { 971 /* Decrypt */ 972 if (gctx->ctr) { 973 if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in, out, 974 len, gctx->ctr)) 975 goto err; 976 } else { 977 if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len)) 978 goto err; 979 } 980 /* Retrieve tag */ 981 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, EVP_GCM_TLS_TAG_LEN); 982 983 /* If tag mismatch wipe buffer */ 984 if (memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN)) { 985 explicit_bzero(out, len); 986 goto err; 987 } 988 rv = len; 989 } 990 991 err: 992 gctx->iv_set = 0; 993 gctx->tls_aad_len = -1; 994 return rv; 995 } 996 997 static int 998 aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 999 const unsigned char *in, size_t len) 1000 { 1001 EVP_AES_GCM_CTX *gctx = ctx->cipher_data; 1002 1003 /* If not set up, return error */ 1004 if (!gctx->key_set) 1005 return -1; 1006 1007 if (gctx->tls_aad_len >= 0) 1008 return aes_gcm_tls_cipher(ctx, out, in, len); 1009 1010 if (!gctx->iv_set) 1011 return -1; 1012 1013 if (in) { 1014 if (out == NULL) { 1015 if (CRYPTO_gcm128_aad(&gctx->gcm, in, len)) 1016 return -1; 1017 } else if (ctx->encrypt) { 1018 if (gctx->ctr) { 1019 if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, 1020 in, out, len, gctx->ctr)) 1021 return -1; 1022 } else { 1023 if (CRYPTO_gcm128_encrypt(&gctx->gcm, 1024 in, out, len)) 1025 return -1; 1026 } 1027 } else { 1028 if (gctx->ctr) { 1029 if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, 1030 in, out, len, gctx->ctr)) 1031 return -1; 1032 } else { 1033 if (CRYPTO_gcm128_decrypt(&gctx->gcm, 1034 in, out, len)) 1035 return -1; 1036 } 1037 } 1038 return len; 1039 } else { 1040 if (!ctx->encrypt) { 1041 if (gctx->taglen < 0) 1042 return -1; 1043 if (CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf, 1044 gctx->taglen) != 0) 1045 return -1; 1046 gctx->iv_set = 0; 1047 return 0; 1048 } 1049 CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16); 1050 gctx->taglen = 16; 1051 1052 /* Don't reuse the IV */ 1053 gctx->iv_set = 0; 1054 return 0; 1055 } 1056 1057 } 1058 1059 #define CUSTOM_FLAGS \ 1060 ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \ 1061 EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_ALWAYS_CALL_INIT | \ 1062 EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY ) 1063 1064 BLOCK_CIPHER_custom(NID_aes, 128, 1, 12, gcm, GCM, 1065 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS) 1066 BLOCK_CIPHER_custom(NID_aes, 192, 1, 12, gcm, GCM, 1067 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS) 1068 BLOCK_CIPHER_custom(NID_aes, 256, 1, 12, gcm, GCM, 1069 EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS) 1070 1071 static int 1072 aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 1073 { 1074 EVP_AES_XTS_CTX *xctx = c->cipher_data; 1075 1076 switch (type) { 1077 case EVP_CTRL_INIT: 1078 /* 1079 * key1 and key2 are used as an indicator both key and IV 1080 * are set 1081 */ 1082 xctx->xts.key1 = NULL; 1083 xctx->xts.key2 = NULL; 1084 return 1; 1085 1086 case EVP_CTRL_COPY: 1087 { 1088 EVP_CIPHER_CTX *out = ptr; 1089 EVP_AES_XTS_CTX *xctx_out = out->cipher_data; 1090 1091 if (xctx->xts.key1) { 1092 if (xctx->xts.key1 != &xctx->ks1) 1093 return 0; 1094 xctx_out->xts.key1 = &xctx_out->ks1; 1095 } 1096 if (xctx->xts.key2) { 1097 if (xctx->xts.key2 != &xctx->ks2) 1098 return 0; 1099 xctx_out->xts.key2 = &xctx_out->ks2; 1100 } 1101 return 1; 1102 } 1103 } 1104 return -1; 1105 } 1106 1107 static int 1108 aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 1109 const unsigned char *iv, int enc) 1110 { 1111 EVP_AES_XTS_CTX *xctx = ctx->cipher_data; 1112 1113 if (!iv && !key) 1114 return 1; 1115 1116 if (key) do { 1117 #ifdef AES_XTS_ASM 1118 xctx->stream = enc ? AES_xts_encrypt : AES_xts_decrypt; 1119 #else 1120 xctx->stream = NULL; 1121 #endif 1122 /* key_len is two AES keys */ 1123 #ifdef BSAES_CAPABLE 1124 if (BSAES_CAPABLE) 1125 xctx->stream = enc ? bsaes_xts_encrypt : 1126 bsaes_xts_decrypt; 1127 else 1128 #endif 1129 #ifdef VPAES_CAPABLE 1130 if (VPAES_CAPABLE) { 1131 if (enc) { 1132 vpaes_set_encrypt_key(key, ctx->key_len * 4, 1133 &xctx->ks1); 1134 xctx->xts.block1 = (block128_f)vpaes_encrypt; 1135 } else { 1136 vpaes_set_decrypt_key(key, ctx->key_len * 4, 1137 &xctx->ks1); 1138 xctx->xts.block1 = (block128_f)vpaes_decrypt; 1139 } 1140 1141 vpaes_set_encrypt_key(key + ctx->key_len / 2, 1142 ctx->key_len * 4, &xctx->ks2); 1143 xctx->xts.block2 = (block128_f)vpaes_encrypt; 1144 1145 xctx->xts.key1 = &xctx->ks1; 1146 break; 1147 } else 1148 #endif 1149 (void)0; /* terminate potentially open 'else' */ 1150 1151 if (enc) { 1152 AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1); 1153 xctx->xts.block1 = (block128_f)AES_encrypt; 1154 } else { 1155 AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1); 1156 xctx->xts.block1 = (block128_f)AES_decrypt; 1157 } 1158 1159 AES_set_encrypt_key(key + ctx->key_len / 2, 1160 ctx->key_len * 4, &xctx->ks2); 1161 xctx->xts.block2 = (block128_f)AES_encrypt; 1162 1163 xctx->xts.key1 = &xctx->ks1; 1164 } while (0); 1165 1166 if (iv) { 1167 xctx->xts.key2 = &xctx->ks2; 1168 memcpy(ctx->iv, iv, 16); 1169 } 1170 1171 return 1; 1172 } 1173 1174 static int 1175 aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 1176 const unsigned char *in, size_t len) 1177 { 1178 EVP_AES_XTS_CTX *xctx = ctx->cipher_data; 1179 1180 if (!xctx->xts.key1 || !xctx->xts.key2) 1181 return 0; 1182 if (!out || !in || len < AES_BLOCK_SIZE) 1183 return 0; 1184 1185 if (xctx->stream) 1186 (*xctx->stream)(in, out, len, xctx->xts.key1, xctx->xts.key2, 1187 ctx->iv); 1188 else if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len, 1189 ctx->encrypt)) 1190 return 0; 1191 return 1; 1192 } 1193 1194 #define aes_xts_cleanup NULL 1195 1196 #define XTS_FLAGS \ 1197 ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \ 1198 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY ) 1199 1200 BLOCK_CIPHER_custom(NID_aes, 128, 1, 16, xts, XTS, EVP_CIPH_FLAG_FIPS|XTS_FLAGS) 1201 BLOCK_CIPHER_custom(NID_aes, 256, 1, 16, xts, XTS, EVP_CIPH_FLAG_FIPS|XTS_FLAGS) 1202 1203 static int 1204 aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 1205 { 1206 EVP_AES_CCM_CTX *cctx = c->cipher_data; 1207 1208 switch (type) { 1209 case EVP_CTRL_INIT: 1210 cctx->key_set = 0; 1211 cctx->iv_set = 0; 1212 cctx->L = 8; 1213 cctx->M = 12; 1214 cctx->tag_set = 0; 1215 cctx->len_set = 0; 1216 return 1; 1217 1218 case EVP_CTRL_CCM_SET_IVLEN: 1219 arg = 15 - arg; 1220 1221 case EVP_CTRL_CCM_SET_L: 1222 if (arg < 2 || arg > 8) 1223 return 0; 1224 cctx->L = arg; 1225 return 1; 1226 1227 case EVP_CTRL_CCM_SET_TAG: 1228 if ((arg & 1) || arg < 4 || arg > 16) 1229 return 0; 1230 if ((c->encrypt && ptr) || (!c->encrypt && !ptr)) 1231 return 0; 1232 if (ptr) { 1233 cctx->tag_set = 1; 1234 memcpy(c->buf, ptr, arg); 1235 } 1236 cctx->M = arg; 1237 return 1; 1238 1239 case EVP_CTRL_CCM_GET_TAG: 1240 if (!c->encrypt || !cctx->tag_set) 1241 return 0; 1242 if (!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg)) 1243 return 0; 1244 cctx->tag_set = 0; 1245 cctx->iv_set = 0; 1246 cctx->len_set = 0; 1247 return 1; 1248 1249 case EVP_CTRL_COPY: 1250 { 1251 EVP_CIPHER_CTX *out = ptr; 1252 EVP_AES_CCM_CTX *cctx_out = out->cipher_data; 1253 1254 if (cctx->ccm.key) { 1255 if (cctx->ccm.key != &cctx->ks) 1256 return 0; 1257 cctx_out->ccm.key = &cctx_out->ks; 1258 } 1259 return 1; 1260 } 1261 1262 default: 1263 return -1; 1264 } 1265 } 1266 1267 static int 1268 aes_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 1269 const unsigned char *iv, int enc) 1270 { 1271 EVP_AES_CCM_CTX *cctx = ctx->cipher_data; 1272 1273 if (!iv && !key) 1274 return 1; 1275 if (key) do { 1276 #ifdef VPAES_CAPABLE 1277 if (VPAES_CAPABLE) { 1278 vpaes_set_encrypt_key(key, ctx->key_len*8, &cctx->ks); 1279 CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L, 1280 &cctx->ks, (block128_f)vpaes_encrypt); 1281 cctx->str = NULL; 1282 cctx->key_set = 1; 1283 break; 1284 } 1285 #endif 1286 AES_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks); 1287 CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L, 1288 &cctx->ks, (block128_f)AES_encrypt); 1289 cctx->str = NULL; 1290 cctx->key_set = 1; 1291 } while (0); 1292 if (iv) { 1293 memcpy(ctx->iv, iv, 15 - cctx->L); 1294 cctx->iv_set = 1; 1295 } 1296 return 1; 1297 } 1298 1299 static int 1300 aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 1301 const unsigned char *in, size_t len) 1302 { 1303 EVP_AES_CCM_CTX *cctx = ctx->cipher_data; 1304 CCM128_CONTEXT *ccm = &cctx->ccm; 1305 1306 /* If not set up, return error */ 1307 if (!cctx->iv_set && !cctx->key_set) 1308 return -1; 1309 if (!ctx->encrypt && !cctx->tag_set) 1310 return -1; 1311 1312 if (!out) { 1313 if (!in) { 1314 if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, 1315 len)) 1316 return -1; 1317 cctx->len_set = 1; 1318 return len; 1319 } 1320 /* If have AAD need message length */ 1321 if (!cctx->len_set && len) 1322 return -1; 1323 CRYPTO_ccm128_aad(ccm, in, len); 1324 return len; 1325 } 1326 /* EVP_*Final() doesn't return any data */ 1327 if (!in) 1328 return 0; 1329 /* If not set length yet do it */ 1330 if (!cctx->len_set) { 1331 if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len)) 1332 return -1; 1333 cctx->len_set = 1; 1334 } 1335 if (ctx->encrypt) { 1336 if (cctx->str ? CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len, 1337 cctx->str) : CRYPTO_ccm128_encrypt(ccm, in, out, len)) 1338 return -1; 1339 cctx->tag_set = 1; 1340 return len; 1341 } else { 1342 int rv = -1; 1343 if (cctx->str ? !CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len, 1344 cctx->str) : !CRYPTO_ccm128_decrypt(ccm, in, out, len)) { 1345 unsigned char tag[16]; 1346 if (CRYPTO_ccm128_tag(ccm, tag, cctx->M)) { 1347 if (!memcmp(tag, ctx->buf, cctx->M)) 1348 rv = len; 1349 } 1350 } 1351 if (rv == -1) 1352 explicit_bzero(out, len); 1353 cctx->iv_set = 0; 1354 cctx->tag_set = 0; 1355 cctx->len_set = 0; 1356 return rv; 1357 } 1358 1359 } 1360 1361 #define aes_ccm_cleanup NULL 1362 1363 BLOCK_CIPHER_custom(NID_aes, 128, 1, 12, ccm, CCM, 1364 EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS) 1365 BLOCK_CIPHER_custom(NID_aes, 192, 1, 12, ccm, CCM, 1366 EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS) 1367 BLOCK_CIPHER_custom(NID_aes, 256, 1, 12, ccm, CCM, 1368 EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS) 1369 1370 #define EVP_AEAD_AES_GCM_TAG_LEN 16 1371 1372 struct aead_aes_gcm_ctx { 1373 union { 1374 double align; 1375 AES_KEY ks; 1376 } ks; 1377 GCM128_CONTEXT gcm; 1378 ctr128_f ctr; 1379 unsigned char tag_len; 1380 }; 1381 1382 static int 1383 aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len, 1384 size_t tag_len) 1385 { 1386 struct aead_aes_gcm_ctx *gcm_ctx; 1387 const size_t key_bits = key_len * 8; 1388 1389 /* EVP_AEAD_CTX_init should catch this. */ 1390 if (key_bits != 128 && key_bits != 256) { 1391 EVPerror(EVP_R_BAD_KEY_LENGTH); 1392 return 0; 1393 } 1394 1395 if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) 1396 tag_len = EVP_AEAD_AES_GCM_TAG_LEN; 1397 1398 if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) { 1399 EVPerror(EVP_R_TAG_TOO_LARGE); 1400 return 0; 1401 } 1402 1403 if ((gcm_ctx = calloc(1, sizeof(struct aead_aes_gcm_ctx))) == NULL) 1404 return 0; 1405 1406 #ifdef AESNI_CAPABLE 1407 if (AESNI_CAPABLE) { 1408 aesni_set_encrypt_key(key, key_bits, &gcm_ctx->ks.ks); 1409 CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks, 1410 (block128_f)aesni_encrypt); 1411 gcm_ctx->ctr = (ctr128_f) aesni_ctr32_encrypt_blocks; 1412 } else 1413 #endif 1414 { 1415 gcm_ctx->ctr = aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, 1416 key, key_len); 1417 } 1418 gcm_ctx->tag_len = tag_len; 1419 ctx->aead_state = gcm_ctx; 1420 1421 return 1; 1422 } 1423 1424 static void 1425 aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx) 1426 { 1427 struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1428 1429 freezero(gcm_ctx, sizeof(*gcm_ctx)); 1430 } 1431 1432 static int 1433 aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len, 1434 size_t max_out_len, const unsigned char *nonce, size_t nonce_len, 1435 const unsigned char *in, size_t in_len, const unsigned char *ad, 1436 size_t ad_len) 1437 { 1438 const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1439 GCM128_CONTEXT gcm; 1440 size_t bulk = 0; 1441 1442 if (max_out_len < in_len + gcm_ctx->tag_len) { 1443 EVPerror(EVP_R_BUFFER_TOO_SMALL); 1444 return 0; 1445 } 1446 1447 memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); 1448 1449 if (nonce_len == 0) { 1450 EVPerror(EVP_R_INVALID_IV_LENGTH); 1451 return 0; 1452 } 1453 CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); 1454 1455 if (ad_len > 0 && CRYPTO_gcm128_aad(&gcm, ad, ad_len)) 1456 return 0; 1457 1458 if (gcm_ctx->ctr) { 1459 if (CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk, 1460 in_len - bulk, gcm_ctx->ctr)) 1461 return 0; 1462 } else { 1463 if (CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk, 1464 in_len - bulk)) 1465 return 0; 1466 } 1467 1468 CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len); 1469 *out_len = in_len + gcm_ctx->tag_len; 1470 1471 return 1; 1472 } 1473 1474 static int 1475 aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len, 1476 size_t max_out_len, const unsigned char *nonce, size_t nonce_len, 1477 const unsigned char *in, size_t in_len, const unsigned char *ad, 1478 size_t ad_len) 1479 { 1480 const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; 1481 unsigned char tag[EVP_AEAD_AES_GCM_TAG_LEN]; 1482 GCM128_CONTEXT gcm; 1483 size_t plaintext_len; 1484 size_t bulk = 0; 1485 1486 if (in_len < gcm_ctx->tag_len) { 1487 EVPerror(EVP_R_BAD_DECRYPT); 1488 return 0; 1489 } 1490 1491 plaintext_len = in_len - gcm_ctx->tag_len; 1492 1493 if (max_out_len < plaintext_len) { 1494 EVPerror(EVP_R_BUFFER_TOO_SMALL); 1495 return 0; 1496 } 1497 1498 memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); 1499 1500 if (nonce_len == 0) { 1501 EVPerror(EVP_R_INVALID_IV_LENGTH); 1502 return 0; 1503 } 1504 CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); 1505 1506 if (CRYPTO_gcm128_aad(&gcm, ad, ad_len)) 1507 return 0; 1508 1509 if (gcm_ctx->ctr) { 1510 if (CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk, 1511 in_len - bulk - gcm_ctx->tag_len, gcm_ctx->ctr)) 1512 return 0; 1513 } else { 1514 if (CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk, 1515 in_len - bulk - gcm_ctx->tag_len)) 1516 return 0; 1517 } 1518 1519 CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len); 1520 if (timingsafe_memcmp(tag, in + plaintext_len, gcm_ctx->tag_len) != 0) { 1521 EVPerror(EVP_R_BAD_DECRYPT); 1522 return 0; 1523 } 1524 1525 *out_len = plaintext_len; 1526 1527 return 1; 1528 } 1529 1530 static const EVP_AEAD aead_aes_128_gcm = { 1531 .key_len = 16, 1532 .nonce_len = 12, 1533 .overhead = EVP_AEAD_AES_GCM_TAG_LEN, 1534 .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, 1535 1536 .init = aead_aes_gcm_init, 1537 .cleanup = aead_aes_gcm_cleanup, 1538 .seal = aead_aes_gcm_seal, 1539 .open = aead_aes_gcm_open, 1540 }; 1541 1542 static const EVP_AEAD aead_aes_256_gcm = { 1543 .key_len = 32, 1544 .nonce_len = 12, 1545 .overhead = EVP_AEAD_AES_GCM_TAG_LEN, 1546 .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, 1547 1548 .init = aead_aes_gcm_init, 1549 .cleanup = aead_aes_gcm_cleanup, 1550 .seal = aead_aes_gcm_seal, 1551 .open = aead_aes_gcm_open, 1552 }; 1553 1554 const EVP_AEAD * 1555 EVP_aead_aes_128_gcm(void) 1556 { 1557 return &aead_aes_128_gcm; 1558 } 1559 1560 const EVP_AEAD * 1561 EVP_aead_aes_256_gcm(void) 1562 { 1563 return &aead_aes_256_gcm; 1564 } 1565 1566 typedef struct { 1567 union { 1568 double align; 1569 AES_KEY ks; 1570 } ks; 1571 unsigned char *iv; 1572 } EVP_AES_WRAP_CTX; 1573 1574 static int 1575 aes_wrap_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 1576 const unsigned char *iv, int enc) 1577 { 1578 EVP_AES_WRAP_CTX *wctx = (EVP_AES_WRAP_CTX *)ctx->cipher_data; 1579 1580 if (iv == NULL && key == NULL) 1581 return 1; 1582 1583 if (key != NULL) { 1584 if (ctx->encrypt) 1585 AES_set_encrypt_key(key, 8 * ctx->key_len, 1586 &wctx->ks.ks); 1587 else 1588 AES_set_decrypt_key(key, 8 * ctx->key_len, 1589 &wctx->ks.ks); 1590 1591 if (iv == NULL) 1592 wctx->iv = NULL; 1593 } 1594 1595 if (iv != NULL) { 1596 memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 1597 wctx->iv = ctx->iv; 1598 } 1599 1600 return 1; 1601 } 1602 1603 static int 1604 aes_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 1605 const unsigned char *in, size_t inlen) 1606 { 1607 EVP_AES_WRAP_CTX *wctx = ctx->cipher_data; 1608 int ret; 1609 1610 if (in == NULL) 1611 return 0; 1612 1613 if (inlen % 8 != 0) 1614 return -1; 1615 if (ctx->encrypt && inlen < 8) 1616 return -1; 1617 if (!ctx->encrypt && inlen < 16) 1618 return -1; 1619 if (inlen > INT_MAX) 1620 return -1; 1621 1622 if (out == NULL) { 1623 if (ctx->encrypt) 1624 return inlen + 8; 1625 else 1626 return inlen - 8; 1627 } 1628 1629 if (ctx->encrypt) 1630 ret = AES_wrap_key(&wctx->ks.ks, wctx->iv, out, in, 1631 (unsigned int)inlen); 1632 else 1633 ret = AES_unwrap_key(&wctx->ks.ks, wctx->iv, out, in, 1634 (unsigned int)inlen); 1635 1636 return ret != 0 ? ret : -1; 1637 } 1638 1639 static int 1640 aes_wrap_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 1641 { 1642 EVP_AES_WRAP_CTX *wctx = c->cipher_data; 1643 1644 switch (type) { 1645 case EVP_CTRL_COPY: 1646 { 1647 EVP_CIPHER_CTX *out = ptr; 1648 EVP_AES_WRAP_CTX *wctx_out = out->cipher_data; 1649 1650 if (wctx->iv != NULL) { 1651 if (c->iv != wctx->iv) 1652 return 0; 1653 1654 wctx_out->iv = out->iv; 1655 } 1656 1657 return 1; 1658 } 1659 } 1660 1661 return -1; 1662 } 1663 1664 #define WRAP_FLAGS \ 1665 ( EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | \ 1666 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_FLAG_DEFAULT_ASN1 | \ 1667 EVP_CIPH_CUSTOM_COPY ) 1668 1669 static const EVP_CIPHER aes_128_wrap = { 1670 .nid = NID_id_aes128_wrap, 1671 .block_size = 8, 1672 .key_len = 16, 1673 .iv_len = 8, 1674 .flags = WRAP_FLAGS, 1675 .init = aes_wrap_init_key, 1676 .do_cipher = aes_wrap_cipher, 1677 .cleanup = NULL, 1678 .ctx_size = sizeof(EVP_AES_WRAP_CTX), 1679 .set_asn1_parameters = NULL, 1680 .get_asn1_parameters = NULL, 1681 .ctrl = aes_wrap_ctrl, 1682 .app_data = NULL, 1683 }; 1684 1685 const EVP_CIPHER * 1686 EVP_aes_128_wrap(void) 1687 { 1688 return &aes_128_wrap; 1689 } 1690 1691 static const EVP_CIPHER aes_192_wrap = { 1692 .nid = NID_id_aes192_wrap, 1693 .block_size = 8, 1694 .key_len = 24, 1695 .iv_len = 8, 1696 .flags = WRAP_FLAGS, 1697 .init = aes_wrap_init_key, 1698 .do_cipher = aes_wrap_cipher, 1699 .cleanup = NULL, 1700 .ctx_size = sizeof(EVP_AES_WRAP_CTX), 1701 .set_asn1_parameters = NULL, 1702 .get_asn1_parameters = NULL, 1703 .ctrl = aes_wrap_ctrl, 1704 .app_data = NULL, 1705 }; 1706 1707 const EVP_CIPHER * 1708 EVP_aes_192_wrap(void) 1709 { 1710 return &aes_192_wrap; 1711 } 1712 1713 static const EVP_CIPHER aes_256_wrap = { 1714 .nid = NID_id_aes256_wrap, 1715 .block_size = 8, 1716 .key_len = 32, 1717 .iv_len = 8, 1718 .flags = WRAP_FLAGS, 1719 .init = aes_wrap_init_key, 1720 .do_cipher = aes_wrap_cipher, 1721 .cleanup = NULL, 1722 .ctx_size = sizeof(EVP_AES_WRAP_CTX), 1723 .set_asn1_parameters = NULL, 1724 .get_asn1_parameters = NULL, 1725 .ctrl = aes_wrap_ctrl, 1726 .app_data = NULL, 1727 }; 1728 1729 const EVP_CIPHER * 1730 EVP_aes_256_wrap(void) 1731 { 1732 return &aes_256_wrap; 1733 } 1734 1735 #endif 1736