1 /* 2 * Wrapper functions for OpenSSL libcrypto 3 * Copyright (c) 2004-2013, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 #include <openssl/opensslv.h> 11 #include <openssl/err.h> 12 #include <openssl/des.h> 13 #include <openssl/aes.h> 14 #include <openssl/bn.h> 15 #include <openssl/evp.h> 16 #include <openssl/dh.h> 17 #include <openssl/hmac.h> 18 #include <openssl/rand.h> 19 #ifdef CONFIG_OPENSSL_CMAC 20 #include <openssl/cmac.h> 21 #endif /* CONFIG_OPENSSL_CMAC */ 22 #ifdef CONFIG_ECC 23 #include <openssl/ec.h> 24 #endif /* CONFIG_ECC */ 25 26 #include "common.h" 27 #include "wpabuf.h" 28 #include "dh_group5.h" 29 #include "sha1.h" 30 #include "sha256.h" 31 #include "crypto.h" 32 33 #if OPENSSL_VERSION_NUMBER < 0x00907000 34 #define DES_key_schedule des_key_schedule 35 #define DES_cblock des_cblock 36 #define DES_set_key(key, schedule) des_set_key((key), *(schedule)) 37 #define DES_ecb_encrypt(input, output, ks, enc) \ 38 des_ecb_encrypt((input), (output), *(ks), (enc)) 39 #endif /* openssl < 0.9.7 */ 40 41 static BIGNUM * get_group5_prime(void) 42 { 43 #if OPENSSL_VERSION_NUMBER < 0x00908000 44 static const unsigned char RFC3526_PRIME_1536[] = { 45 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2, 46 0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1, 47 0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6, 48 0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD, 49 0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D, 50 0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45, 51 0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9, 52 0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED, 53 0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11, 54 0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D, 55 0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36, 56 0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F, 57 0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56, 58 0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D, 59 0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08, 60 0xCA,0x23,0x73,0x27,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, 61 }; 62 return BN_bin2bn(RFC3526_PRIME_1536, sizeof(RFC3526_PRIME_1536), NULL); 63 #else /* openssl < 0.9.8 */ 64 return get_rfc3526_prime_1536(NULL); 65 #endif /* openssl < 0.9.8 */ 66 } 67 68 #if OPENSSL_VERSION_NUMBER < 0x00908000 69 #ifndef OPENSSL_NO_SHA256 70 #ifndef OPENSSL_FIPS 71 #define NO_SHA256_WRAPPER 72 #endif 73 #endif 74 75 #endif /* openssl < 0.9.8 */ 76 77 #ifdef OPENSSL_NO_SHA256 78 #define NO_SHA256_WRAPPER 79 #endif 80 81 static int openssl_digest_vector(const EVP_MD *type, size_t num_elem, 82 const u8 *addr[], const size_t *len, u8 *mac) 83 { 84 EVP_MD_CTX ctx; 85 size_t i; 86 unsigned int mac_len; 87 88 EVP_MD_CTX_init(&ctx); 89 if (!EVP_DigestInit_ex(&ctx, type, NULL)) { 90 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestInit_ex failed: %s", 91 ERR_error_string(ERR_get_error(), NULL)); 92 return -1; 93 } 94 for (i = 0; i < num_elem; i++) { 95 if (!EVP_DigestUpdate(&ctx, addr[i], len[i])) { 96 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestUpdate " 97 "failed: %s", 98 ERR_error_string(ERR_get_error(), NULL)); 99 return -1; 100 } 101 } 102 if (!EVP_DigestFinal(&ctx, mac, &mac_len)) { 103 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestFinal failed: %s", 104 ERR_error_string(ERR_get_error(), NULL)); 105 return -1; 106 } 107 108 return 0; 109 } 110 111 112 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 113 { 114 return openssl_digest_vector(EVP_md4(), num_elem, addr, len, mac); 115 } 116 117 118 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher) 119 { 120 u8 pkey[8], next, tmp; 121 int i; 122 DES_key_schedule ks; 123 124 /* Add parity bits to the key */ 125 next = 0; 126 for (i = 0; i < 7; i++) { 127 tmp = key[i]; 128 pkey[i] = (tmp >> i) | next | 1; 129 next = tmp << (7 - i); 130 } 131 pkey[i] = next | 1; 132 133 DES_set_key(&pkey, &ks); 134 DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks, 135 DES_ENCRYPT); 136 } 137 138 139 int rc4_skip(const u8 *key, size_t keylen, size_t skip, 140 u8 *data, size_t data_len) 141 { 142 #ifdef OPENSSL_NO_RC4 143 return -1; 144 #else /* OPENSSL_NO_RC4 */ 145 EVP_CIPHER_CTX ctx; 146 int outl; 147 int res = -1; 148 unsigned char skip_buf[16]; 149 150 EVP_CIPHER_CTX_init(&ctx); 151 if (!EVP_CIPHER_CTX_set_padding(&ctx, 0) || 152 !EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, NULL, NULL, 1) || 153 !EVP_CIPHER_CTX_set_key_length(&ctx, keylen) || 154 !EVP_CipherInit_ex(&ctx, NULL, NULL, key, NULL, 1)) 155 goto out; 156 157 while (skip >= sizeof(skip_buf)) { 158 size_t len = skip; 159 if (len > sizeof(skip_buf)) 160 len = sizeof(skip_buf); 161 if (!EVP_CipherUpdate(&ctx, skip_buf, &outl, skip_buf, len)) 162 goto out; 163 skip -= len; 164 } 165 166 if (EVP_CipherUpdate(&ctx, data, &outl, data, data_len)) 167 res = 0; 168 169 out: 170 EVP_CIPHER_CTX_cleanup(&ctx); 171 return res; 172 #endif /* OPENSSL_NO_RC4 */ 173 } 174 175 176 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 177 { 178 return openssl_digest_vector(EVP_md5(), num_elem, addr, len, mac); 179 } 180 181 182 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 183 { 184 return openssl_digest_vector(EVP_sha1(), num_elem, addr, len, mac); 185 } 186 187 188 #ifndef NO_SHA256_WRAPPER 189 int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len, 190 u8 *mac) 191 { 192 return openssl_digest_vector(EVP_sha256(), num_elem, addr, len, mac); 193 } 194 #endif /* NO_SHA256_WRAPPER */ 195 196 197 static const EVP_CIPHER * aes_get_evp_cipher(size_t keylen) 198 { 199 switch (keylen) { 200 case 16: 201 return EVP_aes_128_ecb(); 202 case 24: 203 return EVP_aes_192_ecb(); 204 case 32: 205 return EVP_aes_256_ecb(); 206 } 207 208 return NULL; 209 } 210 211 212 void * aes_encrypt_init(const u8 *key, size_t len) 213 { 214 EVP_CIPHER_CTX *ctx; 215 const EVP_CIPHER *type; 216 217 type = aes_get_evp_cipher(len); 218 if (type == NULL) 219 return NULL; 220 221 ctx = os_malloc(sizeof(*ctx)); 222 if (ctx == NULL) 223 return NULL; 224 EVP_CIPHER_CTX_init(ctx); 225 if (EVP_EncryptInit_ex(ctx, type, NULL, key, NULL) != 1) { 226 os_free(ctx); 227 return NULL; 228 } 229 EVP_CIPHER_CTX_set_padding(ctx, 0); 230 return ctx; 231 } 232 233 234 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt) 235 { 236 EVP_CIPHER_CTX *c = ctx; 237 int clen = 16; 238 if (EVP_EncryptUpdate(c, crypt, &clen, plain, 16) != 1) { 239 wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptUpdate failed: %s", 240 ERR_error_string(ERR_get_error(), NULL)); 241 } 242 } 243 244 245 void aes_encrypt_deinit(void *ctx) 246 { 247 EVP_CIPHER_CTX *c = ctx; 248 u8 buf[16]; 249 int len = sizeof(buf); 250 if (EVP_EncryptFinal_ex(c, buf, &len) != 1) { 251 wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptFinal_ex failed: " 252 "%s", ERR_error_string(ERR_get_error(), NULL)); 253 } 254 if (len != 0) { 255 wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d " 256 "in AES encrypt", len); 257 } 258 EVP_CIPHER_CTX_cleanup(c); 259 os_free(c); 260 } 261 262 263 void * aes_decrypt_init(const u8 *key, size_t len) 264 { 265 EVP_CIPHER_CTX *ctx; 266 const EVP_CIPHER *type; 267 268 type = aes_get_evp_cipher(len); 269 if (type == NULL) 270 return NULL; 271 272 ctx = os_malloc(sizeof(*ctx)); 273 if (ctx == NULL) 274 return NULL; 275 EVP_CIPHER_CTX_init(ctx); 276 if (EVP_DecryptInit_ex(ctx, type, NULL, key, NULL) != 1) { 277 os_free(ctx); 278 return NULL; 279 } 280 EVP_CIPHER_CTX_set_padding(ctx, 0); 281 return ctx; 282 } 283 284 285 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain) 286 { 287 EVP_CIPHER_CTX *c = ctx; 288 int plen = 16; 289 if (EVP_DecryptUpdate(c, plain, &plen, crypt, 16) != 1) { 290 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptUpdate failed: %s", 291 ERR_error_string(ERR_get_error(), NULL)); 292 } 293 } 294 295 296 void aes_decrypt_deinit(void *ctx) 297 { 298 EVP_CIPHER_CTX *c = ctx; 299 u8 buf[16]; 300 int len = sizeof(buf); 301 if (EVP_DecryptFinal_ex(c, buf, &len) != 1) { 302 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptFinal_ex failed: " 303 "%s", ERR_error_string(ERR_get_error(), NULL)); 304 } 305 if (len != 0) { 306 wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d " 307 "in AES decrypt", len); 308 } 309 EVP_CIPHER_CTX_cleanup(c); 310 os_free(ctx); 311 } 312 313 314 int crypto_mod_exp(const u8 *base, size_t base_len, 315 const u8 *power, size_t power_len, 316 const u8 *modulus, size_t modulus_len, 317 u8 *result, size_t *result_len) 318 { 319 BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result; 320 int ret = -1; 321 BN_CTX *ctx; 322 323 ctx = BN_CTX_new(); 324 if (ctx == NULL) 325 return -1; 326 327 bn_base = BN_bin2bn(base, base_len, NULL); 328 bn_exp = BN_bin2bn(power, power_len, NULL); 329 bn_modulus = BN_bin2bn(modulus, modulus_len, NULL); 330 bn_result = BN_new(); 331 332 if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL || 333 bn_result == NULL) 334 goto error; 335 336 if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1) 337 goto error; 338 339 *result_len = BN_bn2bin(bn_result, result); 340 ret = 0; 341 342 error: 343 BN_clear_free(bn_base); 344 BN_clear_free(bn_exp); 345 BN_clear_free(bn_modulus); 346 BN_clear_free(bn_result); 347 BN_CTX_free(ctx); 348 return ret; 349 } 350 351 352 struct crypto_cipher { 353 EVP_CIPHER_CTX enc; 354 EVP_CIPHER_CTX dec; 355 }; 356 357 358 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg, 359 const u8 *iv, const u8 *key, 360 size_t key_len) 361 { 362 struct crypto_cipher *ctx; 363 const EVP_CIPHER *cipher; 364 365 ctx = os_zalloc(sizeof(*ctx)); 366 if (ctx == NULL) 367 return NULL; 368 369 switch (alg) { 370 #ifndef OPENSSL_NO_RC4 371 case CRYPTO_CIPHER_ALG_RC4: 372 cipher = EVP_rc4(); 373 break; 374 #endif /* OPENSSL_NO_RC4 */ 375 #ifndef OPENSSL_NO_AES 376 case CRYPTO_CIPHER_ALG_AES: 377 switch (key_len) { 378 case 16: 379 cipher = EVP_aes_128_cbc(); 380 break; 381 case 24: 382 cipher = EVP_aes_192_cbc(); 383 break; 384 case 32: 385 cipher = EVP_aes_256_cbc(); 386 break; 387 default: 388 os_free(ctx); 389 return NULL; 390 } 391 break; 392 #endif /* OPENSSL_NO_AES */ 393 #ifndef OPENSSL_NO_DES 394 case CRYPTO_CIPHER_ALG_3DES: 395 cipher = EVP_des_ede3_cbc(); 396 break; 397 case CRYPTO_CIPHER_ALG_DES: 398 cipher = EVP_des_cbc(); 399 break; 400 #endif /* OPENSSL_NO_DES */ 401 #ifndef OPENSSL_NO_RC2 402 case CRYPTO_CIPHER_ALG_RC2: 403 cipher = EVP_rc2_ecb(); 404 break; 405 #endif /* OPENSSL_NO_RC2 */ 406 default: 407 os_free(ctx); 408 return NULL; 409 } 410 411 EVP_CIPHER_CTX_init(&ctx->enc); 412 EVP_CIPHER_CTX_set_padding(&ctx->enc, 0); 413 if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) || 414 !EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) || 415 !EVP_EncryptInit_ex(&ctx->enc, NULL, NULL, key, iv)) { 416 EVP_CIPHER_CTX_cleanup(&ctx->enc); 417 os_free(ctx); 418 return NULL; 419 } 420 421 EVP_CIPHER_CTX_init(&ctx->dec); 422 EVP_CIPHER_CTX_set_padding(&ctx->dec, 0); 423 if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) || 424 !EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) || 425 !EVP_DecryptInit_ex(&ctx->dec, NULL, NULL, key, iv)) { 426 EVP_CIPHER_CTX_cleanup(&ctx->enc); 427 EVP_CIPHER_CTX_cleanup(&ctx->dec); 428 os_free(ctx); 429 return NULL; 430 } 431 432 return ctx; 433 } 434 435 436 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain, 437 u8 *crypt, size_t len) 438 { 439 int outl; 440 if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len)) 441 return -1; 442 return 0; 443 } 444 445 446 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt, 447 u8 *plain, size_t len) 448 { 449 int outl; 450 outl = len; 451 if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len)) 452 return -1; 453 return 0; 454 } 455 456 457 void crypto_cipher_deinit(struct crypto_cipher *ctx) 458 { 459 EVP_CIPHER_CTX_cleanup(&ctx->enc); 460 EVP_CIPHER_CTX_cleanup(&ctx->dec); 461 os_free(ctx); 462 } 463 464 465 void * dh5_init(struct wpabuf **priv, struct wpabuf **publ) 466 { 467 DH *dh; 468 struct wpabuf *pubkey = NULL, *privkey = NULL; 469 size_t publen, privlen; 470 471 *priv = NULL; 472 *publ = NULL; 473 474 dh = DH_new(); 475 if (dh == NULL) 476 return NULL; 477 478 dh->g = BN_new(); 479 if (dh->g == NULL || BN_set_word(dh->g, 2) != 1) 480 goto err; 481 482 dh->p = get_group5_prime(); 483 if (dh->p == NULL) 484 goto err; 485 486 if (DH_generate_key(dh) != 1) 487 goto err; 488 489 publen = BN_num_bytes(dh->pub_key); 490 pubkey = wpabuf_alloc(publen); 491 if (pubkey == NULL) 492 goto err; 493 privlen = BN_num_bytes(dh->priv_key); 494 privkey = wpabuf_alloc(privlen); 495 if (privkey == NULL) 496 goto err; 497 498 BN_bn2bin(dh->pub_key, wpabuf_put(pubkey, publen)); 499 BN_bn2bin(dh->priv_key, wpabuf_put(privkey, privlen)); 500 501 *priv = privkey; 502 *publ = pubkey; 503 return dh; 504 505 err: 506 wpabuf_free(pubkey); 507 wpabuf_free(privkey); 508 DH_free(dh); 509 return NULL; 510 } 511 512 513 void * dh5_init_fixed(const struct wpabuf *priv, const struct wpabuf *publ) 514 { 515 DH *dh; 516 517 dh = DH_new(); 518 if (dh == NULL) 519 return NULL; 520 521 dh->g = BN_new(); 522 if (dh->g == NULL || BN_set_word(dh->g, 2) != 1) 523 goto err; 524 525 dh->p = get_group5_prime(); 526 if (dh->p == NULL) 527 goto err; 528 529 dh->priv_key = BN_bin2bn(wpabuf_head(priv), wpabuf_len(priv), NULL); 530 if (dh->priv_key == NULL) 531 goto err; 532 533 dh->pub_key = BN_bin2bn(wpabuf_head(publ), wpabuf_len(publ), NULL); 534 if (dh->pub_key == NULL) 535 goto err; 536 537 if (DH_generate_key(dh) != 1) 538 goto err; 539 540 return dh; 541 542 err: 543 DH_free(dh); 544 return NULL; 545 } 546 547 548 struct wpabuf * dh5_derive_shared(void *ctx, const struct wpabuf *peer_public, 549 const struct wpabuf *own_private) 550 { 551 BIGNUM *pub_key; 552 struct wpabuf *res = NULL; 553 size_t rlen; 554 DH *dh = ctx; 555 int keylen; 556 557 if (ctx == NULL) 558 return NULL; 559 560 pub_key = BN_bin2bn(wpabuf_head(peer_public), wpabuf_len(peer_public), 561 NULL); 562 if (pub_key == NULL) 563 return NULL; 564 565 rlen = DH_size(dh); 566 res = wpabuf_alloc(rlen); 567 if (res == NULL) 568 goto err; 569 570 keylen = DH_compute_key(wpabuf_mhead(res), pub_key, dh); 571 if (keylen < 0) 572 goto err; 573 wpabuf_put(res, keylen); 574 BN_clear_free(pub_key); 575 576 return res; 577 578 err: 579 BN_clear_free(pub_key); 580 wpabuf_free(res); 581 return NULL; 582 } 583 584 585 void dh5_free(void *ctx) 586 { 587 DH *dh; 588 if (ctx == NULL) 589 return; 590 dh = ctx; 591 DH_free(dh); 592 } 593 594 595 struct crypto_hash { 596 HMAC_CTX ctx; 597 }; 598 599 600 struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key, 601 size_t key_len) 602 { 603 struct crypto_hash *ctx; 604 const EVP_MD *md; 605 606 switch (alg) { 607 #ifndef OPENSSL_NO_MD5 608 case CRYPTO_HASH_ALG_HMAC_MD5: 609 md = EVP_md5(); 610 break; 611 #endif /* OPENSSL_NO_MD5 */ 612 #ifndef OPENSSL_NO_SHA 613 case CRYPTO_HASH_ALG_HMAC_SHA1: 614 md = EVP_sha1(); 615 break; 616 #endif /* OPENSSL_NO_SHA */ 617 #ifndef OPENSSL_NO_SHA256 618 #ifdef CONFIG_SHA256 619 case CRYPTO_HASH_ALG_HMAC_SHA256: 620 md = EVP_sha256(); 621 break; 622 #endif /* CONFIG_SHA256 */ 623 #endif /* OPENSSL_NO_SHA256 */ 624 default: 625 return NULL; 626 } 627 628 ctx = os_zalloc(sizeof(*ctx)); 629 if (ctx == NULL) 630 return NULL; 631 HMAC_CTX_init(&ctx->ctx); 632 633 #if OPENSSL_VERSION_NUMBER < 0x00909000 634 HMAC_Init_ex(&ctx->ctx, key, key_len, md, NULL); 635 #else /* openssl < 0.9.9 */ 636 if (HMAC_Init_ex(&ctx->ctx, key, key_len, md, NULL) != 1) { 637 os_free(ctx); 638 return NULL; 639 } 640 #endif /* openssl < 0.9.9 */ 641 642 return ctx; 643 } 644 645 646 void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len) 647 { 648 if (ctx == NULL) 649 return; 650 HMAC_Update(&ctx->ctx, data, len); 651 } 652 653 654 int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len) 655 { 656 unsigned int mdlen; 657 int res; 658 659 if (ctx == NULL) 660 return -2; 661 662 if (mac == NULL || len == NULL) { 663 os_free(ctx); 664 return 0; 665 } 666 667 mdlen = *len; 668 #if OPENSSL_VERSION_NUMBER < 0x00909000 669 HMAC_Final(&ctx->ctx, mac, &mdlen); 670 res = 1; 671 #else /* openssl < 0.9.9 */ 672 res = HMAC_Final(&ctx->ctx, mac, &mdlen); 673 #endif /* openssl < 0.9.9 */ 674 HMAC_CTX_cleanup(&ctx->ctx); 675 os_free(ctx); 676 677 if (res == 1) { 678 *len = mdlen; 679 return 0; 680 } 681 682 return -1; 683 } 684 685 686 int pbkdf2_sha1(const char *passphrase, const u8 *ssid, size_t ssid_len, 687 int iterations, u8 *buf, size_t buflen) 688 { 689 #if OPENSSL_VERSION_NUMBER < 0x00908000 690 if (PKCS5_PBKDF2_HMAC_SHA1(passphrase, os_strlen(passphrase), 691 (unsigned char *) ssid, 692 ssid_len, 4096, buflen, buf) != 1) 693 return -1; 694 #else /* openssl < 0.9.8 */ 695 if (PKCS5_PBKDF2_HMAC_SHA1(passphrase, os_strlen(passphrase), ssid, 696 ssid_len, 4096, buflen, buf) != 1) 697 return -1; 698 #endif /* openssl < 0.9.8 */ 699 return 0; 700 } 701 702 703 int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem, 704 const u8 *addr[], const size_t *len, u8 *mac) 705 { 706 HMAC_CTX ctx; 707 size_t i; 708 unsigned int mdlen; 709 int res; 710 711 HMAC_CTX_init(&ctx); 712 #if OPENSSL_VERSION_NUMBER < 0x00909000 713 HMAC_Init_ex(&ctx, key, key_len, EVP_sha1(), NULL); 714 #else /* openssl < 0.9.9 */ 715 if (HMAC_Init_ex(&ctx, key, key_len, EVP_sha1(), NULL) != 1) 716 return -1; 717 #endif /* openssl < 0.9.9 */ 718 719 for (i = 0; i < num_elem; i++) 720 HMAC_Update(&ctx, addr[i], len[i]); 721 722 mdlen = 20; 723 #if OPENSSL_VERSION_NUMBER < 0x00909000 724 HMAC_Final(&ctx, mac, &mdlen); 725 res = 1; 726 #else /* openssl < 0.9.9 */ 727 res = HMAC_Final(&ctx, mac, &mdlen); 728 #endif /* openssl < 0.9.9 */ 729 HMAC_CTX_cleanup(&ctx); 730 731 return res == 1 ? 0 : -1; 732 } 733 734 735 int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len, 736 u8 *mac) 737 { 738 return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac); 739 } 740 741 742 #ifdef CONFIG_SHA256 743 744 int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem, 745 const u8 *addr[], const size_t *len, u8 *mac) 746 { 747 HMAC_CTX ctx; 748 size_t i; 749 unsigned int mdlen; 750 int res; 751 752 HMAC_CTX_init(&ctx); 753 #if OPENSSL_VERSION_NUMBER < 0x00909000 754 HMAC_Init_ex(&ctx, key, key_len, EVP_sha256(), NULL); 755 #else /* openssl < 0.9.9 */ 756 if (HMAC_Init_ex(&ctx, key, key_len, EVP_sha256(), NULL) != 1) 757 return -1; 758 #endif /* openssl < 0.9.9 */ 759 760 for (i = 0; i < num_elem; i++) 761 HMAC_Update(&ctx, addr[i], len[i]); 762 763 mdlen = 32; 764 #if OPENSSL_VERSION_NUMBER < 0x00909000 765 HMAC_Final(&ctx, mac, &mdlen); 766 res = 1; 767 #else /* openssl < 0.9.9 */ 768 res = HMAC_Final(&ctx, mac, &mdlen); 769 #endif /* openssl < 0.9.9 */ 770 HMAC_CTX_cleanup(&ctx); 771 772 return res == 1 ? 0 : -1; 773 } 774 775 776 int hmac_sha256(const u8 *key, size_t key_len, const u8 *data, 777 size_t data_len, u8 *mac) 778 { 779 return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac); 780 } 781 782 #endif /* CONFIG_SHA256 */ 783 784 785 int crypto_get_random(void *buf, size_t len) 786 { 787 if (RAND_bytes(buf, len) != 1) 788 return -1; 789 return 0; 790 } 791 792 793 #ifdef CONFIG_OPENSSL_CMAC 794 int omac1_aes_128_vector(const u8 *key, size_t num_elem, 795 const u8 *addr[], const size_t *len, u8 *mac) 796 { 797 CMAC_CTX *ctx; 798 int ret = -1; 799 size_t outlen, i; 800 801 ctx = CMAC_CTX_new(); 802 if (ctx == NULL) 803 return -1; 804 805 if (!CMAC_Init(ctx, key, 16, EVP_aes_128_cbc(), NULL)) 806 goto fail; 807 for (i = 0; i < num_elem; i++) { 808 if (!CMAC_Update(ctx, addr[i], len[i])) 809 goto fail; 810 } 811 if (!CMAC_Final(ctx, mac, &outlen) || outlen != 16) 812 goto fail; 813 814 ret = 0; 815 fail: 816 CMAC_CTX_free(ctx); 817 return ret; 818 } 819 820 821 int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac) 822 { 823 return omac1_aes_128_vector(key, 1, &data, &data_len, mac); 824 } 825 #endif /* CONFIG_OPENSSL_CMAC */ 826 827 828 struct crypto_bignum * crypto_bignum_init(void) 829 { 830 return (struct crypto_bignum *) BN_new(); 831 } 832 833 834 struct crypto_bignum * crypto_bignum_init_set(const u8 *buf, size_t len) 835 { 836 BIGNUM *bn = BN_bin2bn(buf, len, NULL); 837 return (struct crypto_bignum *) bn; 838 } 839 840 841 void crypto_bignum_deinit(struct crypto_bignum *n, int clear) 842 { 843 if (clear) 844 BN_clear_free((BIGNUM *) n); 845 else 846 BN_free((BIGNUM *) n); 847 } 848 849 850 int crypto_bignum_to_bin(const struct crypto_bignum *a, 851 u8 *buf, size_t buflen, size_t padlen) 852 { 853 int num_bytes, offset; 854 855 if (padlen > buflen) 856 return -1; 857 858 num_bytes = BN_num_bytes((const BIGNUM *) a); 859 if ((size_t) num_bytes > buflen) 860 return -1; 861 if (padlen > (size_t) num_bytes) 862 offset = padlen - num_bytes; 863 else 864 offset = 0; 865 866 os_memset(buf, 0, offset); 867 BN_bn2bin((const BIGNUM *) a, buf + offset); 868 869 return num_bytes + offset; 870 } 871 872 873 int crypto_bignum_add(const struct crypto_bignum *a, 874 const struct crypto_bignum *b, 875 struct crypto_bignum *c) 876 { 877 return BN_add((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ? 878 0 : -1; 879 } 880 881 882 int crypto_bignum_mod(const struct crypto_bignum *a, 883 const struct crypto_bignum *b, 884 struct crypto_bignum *c) 885 { 886 int res; 887 BN_CTX *bnctx; 888 889 bnctx = BN_CTX_new(); 890 if (bnctx == NULL) 891 return -1; 892 res = BN_mod((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b, 893 bnctx); 894 BN_CTX_free(bnctx); 895 896 return res ? 0 : -1; 897 } 898 899 900 int crypto_bignum_exptmod(const struct crypto_bignum *a, 901 const struct crypto_bignum *b, 902 const struct crypto_bignum *c, 903 struct crypto_bignum *d) 904 { 905 int res; 906 BN_CTX *bnctx; 907 908 bnctx = BN_CTX_new(); 909 if (bnctx == NULL) 910 return -1; 911 res = BN_mod_exp((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b, 912 (const BIGNUM *) c, bnctx); 913 BN_CTX_free(bnctx); 914 915 return res ? 0 : -1; 916 } 917 918 919 int crypto_bignum_inverse(const struct crypto_bignum *a, 920 const struct crypto_bignum *b, 921 struct crypto_bignum *c) 922 { 923 BIGNUM *res; 924 BN_CTX *bnctx; 925 926 bnctx = BN_CTX_new(); 927 if (bnctx == NULL) 928 return -1; 929 res = BN_mod_inverse((BIGNUM *) c, (const BIGNUM *) a, 930 (const BIGNUM *) b, bnctx); 931 BN_CTX_free(bnctx); 932 933 return res ? 0 : -1; 934 } 935 936 937 int crypto_bignum_sub(const struct crypto_bignum *a, 938 const struct crypto_bignum *b, 939 struct crypto_bignum *c) 940 { 941 return BN_sub((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ? 942 0 : -1; 943 } 944 945 946 int crypto_bignum_div(const struct crypto_bignum *a, 947 const struct crypto_bignum *b, 948 struct crypto_bignum *c) 949 { 950 int res; 951 952 BN_CTX *bnctx; 953 954 bnctx = BN_CTX_new(); 955 if (bnctx == NULL) 956 return -1; 957 res = BN_div((BIGNUM *) c, NULL, (const BIGNUM *) a, 958 (const BIGNUM *) b, bnctx); 959 BN_CTX_free(bnctx); 960 961 return res ? 0 : -1; 962 } 963 964 965 int crypto_bignum_mulmod(const struct crypto_bignum *a, 966 const struct crypto_bignum *b, 967 const struct crypto_bignum *c, 968 struct crypto_bignum *d) 969 { 970 int res; 971 972 BN_CTX *bnctx; 973 974 bnctx = BN_CTX_new(); 975 if (bnctx == NULL) 976 return -1; 977 res = BN_mod_mul((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b, 978 (const BIGNUM *) c, bnctx); 979 BN_CTX_free(bnctx); 980 981 return res ? 0 : -1; 982 } 983 984 985 int crypto_bignum_cmp(const struct crypto_bignum *a, 986 const struct crypto_bignum *b) 987 { 988 return BN_cmp((const BIGNUM *) a, (const BIGNUM *) b); 989 } 990 991 992 int crypto_bignum_bits(const struct crypto_bignum *a) 993 { 994 return BN_num_bits((const BIGNUM *) a); 995 } 996 997 998 int crypto_bignum_is_zero(const struct crypto_bignum *a) 999 { 1000 return BN_is_zero((const BIGNUM *) a); 1001 } 1002 1003 1004 int crypto_bignum_is_one(const struct crypto_bignum *a) 1005 { 1006 return BN_is_one((const BIGNUM *) a); 1007 } 1008 1009 1010 #ifdef CONFIG_ECC 1011 1012 struct crypto_ec { 1013 EC_GROUP *group; 1014 BN_CTX *bnctx; 1015 BIGNUM *prime; 1016 BIGNUM *order; 1017 }; 1018 1019 struct crypto_ec * crypto_ec_init(int group) 1020 { 1021 struct crypto_ec *e; 1022 int nid; 1023 1024 /* Map from IANA registry for IKE D-H groups to OpenSSL NID */ 1025 switch (group) { 1026 case 19: 1027 nid = NID_X9_62_prime256v1; 1028 break; 1029 case 20: 1030 nid = NID_secp384r1; 1031 break; 1032 case 21: 1033 nid = NID_secp521r1; 1034 break; 1035 case 25: 1036 nid = NID_X9_62_prime192v1; 1037 break; 1038 case 26: 1039 nid = NID_secp224r1; 1040 break; 1041 default: 1042 return NULL; 1043 } 1044 1045 e = os_zalloc(sizeof(*e)); 1046 if (e == NULL) 1047 return NULL; 1048 1049 e->bnctx = BN_CTX_new(); 1050 e->group = EC_GROUP_new_by_curve_name(nid); 1051 e->prime = BN_new(); 1052 e->order = BN_new(); 1053 if (e->group == NULL || e->bnctx == NULL || e->prime == NULL || 1054 e->order == NULL || 1055 !EC_GROUP_get_curve_GFp(e->group, e->prime, NULL, NULL, e->bnctx) || 1056 !EC_GROUP_get_order(e->group, e->order, e->bnctx)) { 1057 crypto_ec_deinit(e); 1058 e = NULL; 1059 } 1060 1061 return e; 1062 } 1063 1064 1065 void crypto_ec_deinit(struct crypto_ec *e) 1066 { 1067 if (e == NULL) 1068 return; 1069 BN_clear_free(e->order); 1070 EC_GROUP_free(e->group); 1071 BN_CTX_free(e->bnctx); 1072 os_free(e); 1073 } 1074 1075 1076 struct crypto_ec_point * crypto_ec_point_init(struct crypto_ec *e) 1077 { 1078 if (e == NULL) 1079 return NULL; 1080 return (struct crypto_ec_point *) EC_POINT_new(e->group); 1081 } 1082 1083 1084 size_t crypto_ec_prime_len(struct crypto_ec *e) 1085 { 1086 return BN_num_bytes(e->prime); 1087 } 1088 1089 1090 size_t crypto_ec_prime_len_bits(struct crypto_ec *e) 1091 { 1092 return BN_num_bits(e->prime); 1093 } 1094 1095 1096 const struct crypto_bignum * crypto_ec_get_prime(struct crypto_ec *e) 1097 { 1098 return (const struct crypto_bignum *) e->prime; 1099 } 1100 1101 1102 const struct crypto_bignum * crypto_ec_get_order(struct crypto_ec *e) 1103 { 1104 return (const struct crypto_bignum *) e->order; 1105 } 1106 1107 1108 void crypto_ec_point_deinit(struct crypto_ec_point *p, int clear) 1109 { 1110 if (clear) 1111 EC_POINT_clear_free((EC_POINT *) p); 1112 else 1113 EC_POINT_free((EC_POINT *) p); 1114 } 1115 1116 1117 int crypto_ec_point_to_bin(struct crypto_ec *e, 1118 const struct crypto_ec_point *point, u8 *x, u8 *y) 1119 { 1120 BIGNUM *x_bn, *y_bn; 1121 int ret = -1; 1122 int len = BN_num_bytes(e->prime); 1123 1124 x_bn = BN_new(); 1125 y_bn = BN_new(); 1126 1127 if (x_bn && y_bn && 1128 EC_POINT_get_affine_coordinates_GFp(e->group, (EC_POINT *) point, 1129 x_bn, y_bn, e->bnctx)) { 1130 if (x) { 1131 crypto_bignum_to_bin((struct crypto_bignum *) x_bn, 1132 x, len, len); 1133 } 1134 if (y) { 1135 crypto_bignum_to_bin((struct crypto_bignum *) y_bn, 1136 y, len, len); 1137 } 1138 ret = 0; 1139 } 1140 1141 BN_clear_free(x_bn); 1142 BN_clear_free(y_bn); 1143 return ret; 1144 } 1145 1146 1147 struct crypto_ec_point * crypto_ec_point_from_bin(struct crypto_ec *e, 1148 const u8 *val) 1149 { 1150 BIGNUM *x, *y; 1151 EC_POINT *elem; 1152 int len = BN_num_bytes(e->prime); 1153 1154 x = BN_bin2bn(val, len, NULL); 1155 y = BN_bin2bn(val + len, len, NULL); 1156 elem = EC_POINT_new(e->group); 1157 if (x == NULL || y == NULL || elem == NULL) { 1158 BN_clear_free(x); 1159 BN_clear_free(y); 1160 EC_POINT_clear_free(elem); 1161 return NULL; 1162 } 1163 1164 if (!EC_POINT_set_affine_coordinates_GFp(e->group, elem, x, y, 1165 e->bnctx)) { 1166 EC_POINT_clear_free(elem); 1167 elem = NULL; 1168 } 1169 1170 BN_clear_free(x); 1171 BN_clear_free(y); 1172 1173 return (struct crypto_ec_point *) elem; 1174 } 1175 1176 1177 int crypto_ec_point_add(struct crypto_ec *e, const struct crypto_ec_point *a, 1178 const struct crypto_ec_point *b, 1179 struct crypto_ec_point *c) 1180 { 1181 return EC_POINT_add(e->group, (EC_POINT *) c, (const EC_POINT *) a, 1182 (const EC_POINT *) b, e->bnctx) ? 0 : -1; 1183 } 1184 1185 1186 int crypto_ec_point_mul(struct crypto_ec *e, const struct crypto_ec_point *p, 1187 const struct crypto_bignum *b, 1188 struct crypto_ec_point *res) 1189 { 1190 return EC_POINT_mul(e->group, (EC_POINT *) res, NULL, 1191 (const EC_POINT *) p, (const BIGNUM *) b, e->bnctx) 1192 ? 0 : -1; 1193 } 1194 1195 1196 int crypto_ec_point_invert(struct crypto_ec *e, struct crypto_ec_point *p) 1197 { 1198 return EC_POINT_invert(e->group, (EC_POINT *) p, e->bnctx) ? 0 : -1; 1199 } 1200 1201 1202 int crypto_ec_point_solve_y_coord(struct crypto_ec *e, 1203 struct crypto_ec_point *p, 1204 const struct crypto_bignum *x, int y_bit) 1205 { 1206 if (!EC_POINT_set_compressed_coordinates_GFp(e->group, (EC_POINT *) p, 1207 (const BIGNUM *) x, y_bit, 1208 e->bnctx) || 1209 !EC_POINT_is_on_curve(e->group, (EC_POINT *) p, e->bnctx)) 1210 return -1; 1211 return 0; 1212 } 1213 1214 1215 int crypto_ec_point_is_at_infinity(struct crypto_ec *e, 1216 const struct crypto_ec_point *p) 1217 { 1218 return EC_POINT_is_at_infinity(e->group, (const EC_POINT *) p); 1219 } 1220 1221 1222 int crypto_ec_point_is_on_curve(struct crypto_ec *e, 1223 const struct crypto_ec_point *p) 1224 { 1225 return EC_POINT_is_on_curve(e->group, (const EC_POINT *) p, e->bnctx); 1226 } 1227 1228 #endif /* CONFIG_ECC */ 1229
