1 /* 2 * WPA Supplicant / wrapper functions for libcrypto 3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 #include <openssl/opensslv.h> 17 #include <openssl/err.h> 18 #include <openssl/des.h> 19 #include <openssl/aes.h> 20 #include <openssl/bn.h> 21 #include <openssl/evp.h> 22 #include <openssl/dh.h> 23 24 #include "common.h" 25 #include "wpabuf.h" 26 #include "dh_group5.h" 27 #include "crypto.h" 28 29 #if OPENSSL_VERSION_NUMBER < 0x00907000 30 #define DES_key_schedule des_key_schedule 31 #define DES_cblock des_cblock 32 #define DES_set_key(key, schedule) des_set_key((key), *(schedule)) 33 #define DES_ecb_encrypt(input, output, ks, enc) \ 34 des_ecb_encrypt((input), (output), *(ks), (enc)) 35 #endif /* openssl < 0.9.7 */ 36 37 static BIGNUM * get_group5_prime(void) 38 { 39 #if OPENSSL_VERSION_NUMBER < 0x00908000 40 static const unsigned char RFC3526_PRIME_1536[] = { 41 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2, 42 0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1, 43 0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6, 44 0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD, 45 0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D, 46 0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45, 47 0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9, 48 0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED, 49 0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11, 50 0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D, 51 0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36, 52 0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F, 53 0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56, 54 0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D, 55 0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08, 56 0xCA,0x23,0x73,0x27,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, 57 }; 58 return BN_bin2bn(RFC3526_PRIME_1536, sizeof(RFC3526_PRIME_1536), NULL); 59 #else /* openssl < 0.9.8 */ 60 return get_rfc3526_prime_1536(NULL); 61 #endif /* openssl < 0.9.8 */ 62 } 63 64 #if OPENSSL_VERSION_NUMBER < 0x00908000 65 #ifndef OPENSSL_NO_SHA256 66 #ifndef OPENSSL_FIPS 67 #define NO_SHA256_WRAPPER 68 #endif 69 #endif 70 71 #endif /* openssl < 0.9.8 */ 72 73 #ifdef OPENSSL_NO_SHA256 74 #define NO_SHA256_WRAPPER 75 #endif 76 77 static int openssl_digest_vector(const EVP_MD *type, int non_fips, 78 size_t num_elem, const u8 *addr[], 79 const size_t *len, u8 *mac) 80 { 81 EVP_MD_CTX ctx; 82 size_t i; 83 unsigned int mac_len; 84 85 EVP_MD_CTX_init(&ctx); 86 #ifdef CONFIG_FIPS 87 #ifdef OPENSSL_FIPS 88 if (non_fips) 89 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 90 #endif /* OPENSSL_FIPS */ 91 #endif /* CONFIG_FIPS */ 92 if (!EVP_DigestInit_ex(&ctx, type, NULL)) { 93 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestInit_ex failed: %s", 94 ERR_error_string(ERR_get_error(), NULL)); 95 return -1; 96 } 97 for (i = 0; i < num_elem; i++) { 98 if (!EVP_DigestUpdate(&ctx, addr[i], len[i])) { 99 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestUpdate " 100 "failed: %s", 101 ERR_error_string(ERR_get_error(), NULL)); 102 return -1; 103 } 104 } 105 if (!EVP_DigestFinal(&ctx, mac, &mac_len)) { 106 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestFinal failed: %s", 107 ERR_error_string(ERR_get_error(), NULL)); 108 return -1; 109 } 110 111 return 0; 112 } 113 114 115 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 116 { 117 return openssl_digest_vector(EVP_md4(), 0, num_elem, addr, len, mac); 118 } 119 120 121 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher) 122 { 123 u8 pkey[8], next, tmp; 124 int i; 125 DES_key_schedule ks; 126 127 /* Add parity bits to the key */ 128 next = 0; 129 for (i = 0; i < 7; i++) { 130 tmp = key[i]; 131 pkey[i] = (tmp >> i) | next | 1; 132 next = tmp << (7 - i); 133 } 134 pkey[i] = next | 1; 135 136 DES_set_key(&pkey, &ks); 137 DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks, 138 DES_ENCRYPT); 139 } 140 141 142 int rc4_skip(const u8 *key, size_t keylen, size_t skip, 143 u8 *data, size_t data_len) 144 { 145 #ifdef OPENSSL_NO_RC4 146 return -1; 147 #else /* OPENSSL_NO_RC4 */ 148 EVP_CIPHER_CTX ctx; 149 int outl; 150 int res = -1; 151 unsigned char skip_buf[16]; 152 153 EVP_CIPHER_CTX_init(&ctx); 154 if (!EVP_CIPHER_CTX_set_padding(&ctx, 0) || 155 !EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, NULL, NULL, 1) || 156 !EVP_CIPHER_CTX_set_key_length(&ctx, keylen) || 157 !EVP_CipherInit_ex(&ctx, NULL, NULL, key, NULL, 1)) 158 goto out; 159 160 while (skip >= sizeof(skip_buf)) { 161 size_t len = skip; 162 if (len > sizeof(skip_buf)) 163 len = sizeof(skip_buf); 164 if (!EVP_CipherUpdate(&ctx, skip_buf, &outl, skip_buf, len)) 165 goto out; 166 skip -= len; 167 } 168 169 if (EVP_CipherUpdate(&ctx, data, &outl, data, data_len)) 170 res = 0; 171 172 out: 173 EVP_CIPHER_CTX_cleanup(&ctx); 174 return res; 175 #endif /* OPENSSL_NO_RC4 */ 176 } 177 178 179 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 180 { 181 return openssl_digest_vector(EVP_md5(), 0, num_elem, addr, len, mac); 182 } 183 184 185 #ifdef CONFIG_FIPS 186 int md5_vector_non_fips_allow(size_t num_elem, const u8 *addr[], 187 const size_t *len, u8 *mac) 188 { 189 return openssl_digest_vector(EVP_md5(), 1, num_elem, addr, len, mac); 190 } 191 #endif /* CONFIG_FIPS */ 192 193 194 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) 195 { 196 return openssl_digest_vector(EVP_sha1(), 0, num_elem, addr, len, mac); 197 } 198 199 200 #ifndef NO_SHA256_WRAPPER 201 int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len, 202 u8 *mac) 203 { 204 return openssl_digest_vector(EVP_sha256(), 0, num_elem, addr, len, 205 mac); 206 } 207 #endif /* NO_SHA256_WRAPPER */ 208 209 210 void * aes_encrypt_init(const u8 *key, size_t len) 211 { 212 AES_KEY *ak; 213 ak = os_malloc(sizeof(*ak)); 214 if (ak == NULL) 215 return NULL; 216 if (AES_set_encrypt_key(key, 8 * len, ak) < 0) { 217 os_free(ak); 218 return NULL; 219 } 220 return ak; 221 } 222 223 224 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt) 225 { 226 AES_encrypt(plain, crypt, ctx); 227 } 228 229 230 void aes_encrypt_deinit(void *ctx) 231 { 232 os_free(ctx); 233 } 234 235 236 void * aes_decrypt_init(const u8 *key, size_t len) 237 { 238 AES_KEY *ak; 239 ak = os_malloc(sizeof(*ak)); 240 if (ak == NULL) 241 return NULL; 242 if (AES_set_decrypt_key(key, 8 * len, ak) < 0) { 243 os_free(ak); 244 return NULL; 245 } 246 return ak; 247 } 248 249 250 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain) 251 { 252 AES_decrypt(crypt, plain, ctx); 253 } 254 255 256 void aes_decrypt_deinit(void *ctx) 257 { 258 os_free(ctx); 259 } 260 261 262 int crypto_mod_exp(const u8 *base, size_t base_len, 263 const u8 *power, size_t power_len, 264 const u8 *modulus, size_t modulus_len, 265 u8 *result, size_t *result_len) 266 { 267 BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result; 268 int ret = -1; 269 BN_CTX *ctx; 270 271 ctx = BN_CTX_new(); 272 if (ctx == NULL) 273 return -1; 274 275 bn_base = BN_bin2bn(base, base_len, NULL); 276 bn_exp = BN_bin2bn(power, power_len, NULL); 277 bn_modulus = BN_bin2bn(modulus, modulus_len, NULL); 278 bn_result = BN_new(); 279 280 if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL || 281 bn_result == NULL) 282 goto error; 283 284 if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1) 285 goto error; 286 287 *result_len = BN_bn2bin(bn_result, result); 288 ret = 0; 289 290 error: 291 BN_free(bn_base); 292 BN_free(bn_exp); 293 BN_free(bn_modulus); 294 BN_free(bn_result); 295 BN_CTX_free(ctx); 296 return ret; 297 } 298 299 300 struct crypto_cipher { 301 EVP_CIPHER_CTX enc; 302 EVP_CIPHER_CTX dec; 303 }; 304 305 306 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg, 307 const u8 *iv, const u8 *key, 308 size_t key_len) 309 { 310 struct crypto_cipher *ctx; 311 const EVP_CIPHER *cipher; 312 313 ctx = os_zalloc(sizeof(*ctx)); 314 if (ctx == NULL) 315 return NULL; 316 317 switch (alg) { 318 #ifndef OPENSSL_NO_RC4 319 case CRYPTO_CIPHER_ALG_RC4: 320 cipher = EVP_rc4(); 321 break; 322 #endif /* OPENSSL_NO_RC4 */ 323 #ifndef OPENSSL_NO_AES 324 case CRYPTO_CIPHER_ALG_AES: 325 switch (key_len) { 326 case 16: 327 cipher = EVP_aes_128_cbc(); 328 break; 329 case 24: 330 cipher = EVP_aes_192_cbc(); 331 break; 332 case 32: 333 cipher = EVP_aes_256_cbc(); 334 break; 335 default: 336 os_free(ctx); 337 return NULL; 338 } 339 break; 340 #endif /* OPENSSL_NO_AES */ 341 #ifndef OPENSSL_NO_DES 342 case CRYPTO_CIPHER_ALG_3DES: 343 cipher = EVP_des_ede3_cbc(); 344 break; 345 case CRYPTO_CIPHER_ALG_DES: 346 cipher = EVP_des_cbc(); 347 break; 348 #endif /* OPENSSL_NO_DES */ 349 #ifndef OPENSSL_NO_RC2 350 case CRYPTO_CIPHER_ALG_RC2: 351 cipher = EVP_rc2_ecb(); 352 break; 353 #endif /* OPENSSL_NO_RC2 */ 354 default: 355 os_free(ctx); 356 return NULL; 357 } 358 359 EVP_CIPHER_CTX_init(&ctx->enc); 360 EVP_CIPHER_CTX_set_padding(&ctx->enc, 0); 361 if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) || 362 !EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) || 363 !EVP_EncryptInit_ex(&ctx->enc, NULL, NULL, key, iv)) { 364 EVP_CIPHER_CTX_cleanup(&ctx->enc); 365 os_free(ctx); 366 return NULL; 367 } 368 369 EVP_CIPHER_CTX_init(&ctx->dec); 370 EVP_CIPHER_CTX_set_padding(&ctx->dec, 0); 371 if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) || 372 !EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) || 373 !EVP_DecryptInit_ex(&ctx->dec, NULL, NULL, key, iv)) { 374 EVP_CIPHER_CTX_cleanup(&ctx->enc); 375 EVP_CIPHER_CTX_cleanup(&ctx->dec); 376 os_free(ctx); 377 return NULL; 378 } 379 380 return ctx; 381 } 382 383 384 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain, 385 u8 *crypt, size_t len) 386 { 387 int outl; 388 if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len)) 389 return -1; 390 return 0; 391 } 392 393 394 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt, 395 u8 *plain, size_t len) 396 { 397 int outl; 398 outl = len; 399 if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len)) 400 return -1; 401 return 0; 402 } 403 404 405 void crypto_cipher_deinit(struct crypto_cipher *ctx) 406 { 407 EVP_CIPHER_CTX_cleanup(&ctx->enc); 408 EVP_CIPHER_CTX_cleanup(&ctx->dec); 409 os_free(ctx); 410 } 411 412 413 void * dh5_init(struct wpabuf **priv, struct wpabuf **publ) 414 { 415 DH *dh; 416 struct wpabuf *pubkey = NULL, *privkey = NULL; 417 size_t publen, privlen; 418 419 *priv = NULL; 420 *publ = NULL; 421 422 dh = DH_new(); 423 if (dh == NULL) 424 return NULL; 425 426 dh->g = BN_new(); 427 if (dh->g == NULL || BN_set_word(dh->g, 2) != 1) 428 goto err; 429 430 dh->p = get_group5_prime(); 431 if (dh->p == NULL) 432 goto err; 433 434 if (DH_generate_key(dh) != 1) 435 goto err; 436 437 publen = BN_num_bytes(dh->pub_key); 438 pubkey = wpabuf_alloc(publen); 439 if (pubkey == NULL) 440 goto err; 441 privlen = BN_num_bytes(dh->priv_key); 442 privkey = wpabuf_alloc(privlen); 443 if (privkey == NULL) 444 goto err; 445 446 BN_bn2bin(dh->pub_key, wpabuf_put(pubkey, publen)); 447 BN_bn2bin(dh->priv_key, wpabuf_put(privkey, privlen)); 448 449 *priv = privkey; 450 *publ = pubkey; 451 return dh; 452 453 err: 454 wpabuf_free(pubkey); 455 wpabuf_free(privkey); 456 DH_free(dh); 457 return NULL; 458 } 459 460 461 struct wpabuf * dh5_derive_shared(void *ctx, const struct wpabuf *peer_public, 462 const struct wpabuf *own_private) 463 { 464 BIGNUM *pub_key; 465 struct wpabuf *res = NULL; 466 size_t rlen; 467 DH *dh = ctx; 468 int keylen; 469 470 if (ctx == NULL) 471 return NULL; 472 473 pub_key = BN_bin2bn(wpabuf_head(peer_public), wpabuf_len(peer_public), 474 NULL); 475 if (pub_key == NULL) 476 return NULL; 477 478 rlen = DH_size(dh); 479 res = wpabuf_alloc(rlen); 480 if (res == NULL) 481 goto err; 482 483 keylen = DH_compute_key(wpabuf_mhead(res), pub_key, dh); 484 if (keylen < 0) 485 goto err; 486 wpabuf_put(res, keylen); 487 BN_free(pub_key); 488 489 return res; 490 491 err: 492 BN_free(pub_key); 493 wpabuf_free(res); 494 return NULL; 495 } 496 497 498 void dh5_free(void *ctx) 499 { 500 DH *dh; 501 if (ctx == NULL) 502 return; 503 dh = ctx; 504 DH_free(dh); 505 } 506