www.project-moonshot.org Git - mech_eap.orig/blob - libeap/src/crypto/crypto_openssl.c

   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 }