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00015 #include "includes.h"
00016 #include <openssl/opensslv.h>
00017 #include <openssl/err.h>
00018 #include <openssl/des.h>
00019 #include <openssl/aes.h>
00020 #include <openssl/bn.h>
00021 #include <openssl/evp.h>
00022 #include <openssl/dh.h>
00023
00024 #include "common.h"
00025 #include "wpabuf.h"
00026 #include "dh_group5.h"
00027 #include "crypto.h"
00028
00029 #if OPENSSL_VERSION_NUMBER < 0x00907000
00030 #define DES_key_schedule des_key_schedule
00031 #define DES_cblock des_cblock
00032 #define DES_set_key(key, schedule) des_set_key((key), *(schedule))
00033 #define DES_ecb_encrypt(input, output, ks, enc) \
00034 des_ecb_encrypt((input), (output), *(ks), (enc))
00035 #endif
00036
00037 static BIGNUM * get_group5_prime(void)
00038 {
00039 #if OPENSSL_VERSION_NUMBER < 0x00908000
00040 static const unsigned char RFC3526_PRIME_1536[] = {
00041 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
00042 0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
00043 0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
00044 0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
00045 0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
00046 0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
00047 0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
00048 0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
00049 0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
00050 0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
00051 0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
00052 0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
00053 0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
00054 0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
00055 0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
00056 0xCA,0x23,0x73,0x27,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
00057 };
00058 return BN_bin2bn(RFC3526_PRIME_1536, sizeof(RFC3526_PRIME_1536), NULL);
00059 #else
00060 return get_rfc3526_prime_1536(NULL);
00061 #endif
00062 }
00063
00064 #if OPENSSL_VERSION_NUMBER < 0x00908000
00065 #ifndef OPENSSL_NO_SHA256
00066 #ifndef OPENSSL_FIPS
00067 #define NO_SHA256_WRAPPER
00068 #endif
00069 #endif
00070
00071 #endif
00072
00073 #ifdef OPENSSL_NO_SHA256
00074 #define NO_SHA256_WRAPPER
00075 #endif
00076
00077 static int openssl_digest_vector(const EVP_MD *type, int non_fips,
00078 size_t num_elem, const u8 *addr[],
00079 const size_t *len, u8 *mac)
00080 {
00081 EVP_MD_CTX ctx;
00082 size_t i;
00083 unsigned int mac_len;
00084
00085 EVP_MD_CTX_init(&ctx);
00086 #ifdef CONFIG_FIPS
00087 #ifdef OPENSSL_FIPS
00088 if (non_fips)
00089 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
00090 #endif
00091 #endif
00092 if (!EVP_DigestInit_ex(&ctx, type, NULL)) {
00093 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestInit_ex failed: %s",
00094 ERR_error_string(ERR_get_error(), NULL));
00095 return -1;
00096 }
00097 for (i = 0; i < num_elem; i++) {
00098 if (!EVP_DigestUpdate(&ctx, addr[i], len[i])) {
00099 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestUpdate "
00100 "failed: %s",
00101 ERR_error_string(ERR_get_error(), NULL));
00102 return -1;
00103 }
00104 }
00105 if (!EVP_DigestFinal(&ctx, mac, &mac_len)) {
00106 wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestFinal failed: %s",
00107 ERR_error_string(ERR_get_error(), NULL));
00108 return -1;
00109 }
00110
00111 return 0;
00112 }
00113
00114
00115 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00116 {
00117 return openssl_digest_vector(EVP_md4(), 0, num_elem, addr, len, mac);
00118 }
00119
00120
00121 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
00122 {
00123 u8 pkey[8], next, tmp;
00124 int i;
00125 DES_key_schedule ks;
00126
00127
00128 next = 0;
00129 for (i = 0; i < 7; i++) {
00130 tmp = key[i];
00131 pkey[i] = (tmp >> i) | next | 1;
00132 next = tmp << (7 - i);
00133 }
00134 pkey[i] = next | 1;
00135
00136 DES_set_key(&pkey, &ks);
00137 DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks,
00138 DES_ENCRYPT);
00139 }
00140
00141
00142 int rc4_skip(const u8 *key, size_t keylen, size_t skip,
00143 u8 *data, size_t data_len)
00144 {
00145 #ifdef OPENSSL_NO_RC4
00146 return -1;
00147 #else
00148 EVP_CIPHER_CTX ctx;
00149 int outl;
00150 int res = -1;
00151 unsigned char skip_buf[16];
00152
00153 EVP_CIPHER_CTX_init(&ctx);
00154 if (!EVP_CIPHER_CTX_set_padding(&ctx, 0) ||
00155 !EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, NULL, NULL, 1) ||
00156 !EVP_CIPHER_CTX_set_key_length(&ctx, keylen) ||
00157 !EVP_CipherInit_ex(&ctx, NULL, NULL, key, NULL, 1))
00158 goto out;
00159
00160 while (skip >= sizeof(skip_buf)) {
00161 size_t len = skip;
00162 if (len > sizeof(skip_buf))
00163 len = sizeof(skip_buf);
00164 if (!EVP_CipherUpdate(&ctx, skip_buf, &outl, skip_buf, len))
00165 goto out;
00166 skip -= len;
00167 }
00168
00169 if (EVP_CipherUpdate(&ctx, data, &outl, data, data_len))
00170 res = 0;
00171
00172 out:
00173 EVP_CIPHER_CTX_cleanup(&ctx);
00174 return res;
00175 #endif
00176 }
00177
00178
00179 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00180 {
00181 return openssl_digest_vector(EVP_md5(), 0, num_elem, addr, len, mac);
00182 }
00183
00184
00185 #ifdef CONFIG_FIPS
00186 int md5_vector_non_fips_allow(size_t num_elem, const u8 *addr[],
00187 const size_t *len, u8 *mac)
00188 {
00189 return openssl_digest_vector(EVP_md5(), 1, num_elem, addr, len, mac);
00190 }
00191 #endif
00192
00193
00194 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00195 {
00196 return openssl_digest_vector(EVP_sha1(), 0, num_elem, addr, len, mac);
00197 }
00198
00199
00200 #ifndef NO_SHA256_WRAPPER
00201 int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
00202 u8 *mac)
00203 {
00204 return openssl_digest_vector(EVP_sha256(), 0, num_elem, addr, len,
00205 mac);
00206 }
00207 #endif
00208
00209
00210 void * aes_encrypt_init(const u8 *key, size_t len)
00211 {
00212 AES_KEY *ak;
00213 ak = os_malloc(sizeof(*ak));
00214 if (ak == NULL)
00215 return NULL;
00216 if (AES_set_encrypt_key(key, 8 * len, ak) < 0) {
00217 os_free(ak);
00218 return NULL;
00219 }
00220 return ak;
00221 }
00222
00223
00224 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
00225 {
00226 AES_encrypt(plain, crypt, ctx);
00227 }
00228
00229
00230 void aes_encrypt_deinit(void *ctx)
00231 {
00232 os_free(ctx);
00233 }
00234
00235
00236 void * aes_decrypt_init(const u8 *key, size_t len)
00237 {
00238 AES_KEY *ak;
00239 ak = os_malloc(sizeof(*ak));
00240 if (ak == NULL)
00241 return NULL;
00242 if (AES_set_decrypt_key(key, 8 * len, ak) < 0) {
00243 os_free(ak);
00244 return NULL;
00245 }
00246 return ak;
00247 }
00248
00249
00250 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
00251 {
00252 AES_decrypt(crypt, plain, ctx);
00253 }
00254
00255
00256 void aes_decrypt_deinit(void *ctx)
00257 {
00258 os_free(ctx);
00259 }
00260
00261
00262 int crypto_mod_exp(const u8 *base, size_t base_len,
00263 const u8 *power, size_t power_len,
00264 const u8 *modulus, size_t modulus_len,
00265 u8 *result, size_t *result_len)
00266 {
00267 BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result;
00268 int ret = -1;
00269 BN_CTX *ctx;
00270
00271 ctx = BN_CTX_new();
00272 if (ctx == NULL)
00273 return -1;
00274
00275 bn_base = BN_bin2bn(base, base_len, NULL);
00276 bn_exp = BN_bin2bn(power, power_len, NULL);
00277 bn_modulus = BN_bin2bn(modulus, modulus_len, NULL);
00278 bn_result = BN_new();
00279
00280 if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
00281 bn_result == NULL)
00282 goto error;
00283
00284 if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1)
00285 goto error;
00286
00287 *result_len = BN_bn2bin(bn_result, result);
00288 ret = 0;
00289
00290 error:
00291 BN_free(bn_base);
00292 BN_free(bn_exp);
00293 BN_free(bn_modulus);
00294 BN_free(bn_result);
00295 BN_CTX_free(ctx);
00296 return ret;
00297 }
00298
00299
00300 struct crypto_cipher {
00301 EVP_CIPHER_CTX enc;
00302 EVP_CIPHER_CTX dec;
00303 };
00304
00305
00306 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
00307 const u8 *iv, const u8 *key,
00308 size_t key_len)
00309 {
00310 struct crypto_cipher *ctx;
00311 const EVP_CIPHER *cipher;
00312
00313 ctx = os_zalloc(sizeof(*ctx));
00314 if (ctx == NULL)
00315 return NULL;
00316
00317 switch (alg) {
00318 #ifndef OPENSSL_NO_RC4
00319 case CRYPTO_CIPHER_ALG_RC4:
00320 cipher = EVP_rc4();
00321 break;
00322 #endif
00323 #ifndef OPENSSL_NO_AES
00324 case CRYPTO_CIPHER_ALG_AES:
00325 switch (key_len) {
00326 case 16:
00327 cipher = EVP_aes_128_cbc();
00328 break;
00329 case 24:
00330 cipher = EVP_aes_192_cbc();
00331 break;
00332 case 32:
00333 cipher = EVP_aes_256_cbc();
00334 break;
00335 default:
00336 os_free(ctx);
00337 return NULL;
00338 }
00339 break;
00340 #endif
00341 #ifndef OPENSSL_NO_DES
00342 case CRYPTO_CIPHER_ALG_3DES:
00343 cipher = EVP_des_ede3_cbc();
00344 break;
00345 case CRYPTO_CIPHER_ALG_DES:
00346 cipher = EVP_des_cbc();
00347 break;
00348 #endif
00349 #ifndef OPENSSL_NO_RC2
00350 case CRYPTO_CIPHER_ALG_RC2:
00351 cipher = EVP_rc2_ecb();
00352 break;
00353 #endif
00354 default:
00355 os_free(ctx);
00356 return NULL;
00357 }
00358
00359 EVP_CIPHER_CTX_init(&ctx->enc);
00360 EVP_CIPHER_CTX_set_padding(&ctx->enc, 0);
00361 if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) ||
00362 !EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) ||
00363 !EVP_EncryptInit_ex(&ctx->enc, NULL, NULL, key, iv)) {
00364 EVP_CIPHER_CTX_cleanup(&ctx->enc);
00365 os_free(ctx);
00366 return NULL;
00367 }
00368
00369 EVP_CIPHER_CTX_init(&ctx->dec);
00370 EVP_CIPHER_CTX_set_padding(&ctx->dec, 0);
00371 if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) ||
00372 !EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) ||
00373 !EVP_DecryptInit_ex(&ctx->dec, NULL, NULL, key, iv)) {
00374 EVP_CIPHER_CTX_cleanup(&ctx->enc);
00375 EVP_CIPHER_CTX_cleanup(&ctx->dec);
00376 os_free(ctx);
00377 return NULL;
00378 }
00379
00380 return ctx;
00381 }
00382
00383
00384 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
00385 u8 *crypt, size_t len)
00386 {
00387 int outl;
00388 if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len))
00389 return -1;
00390 return 0;
00391 }
00392
00393
00394 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
00395 u8 *plain, size_t len)
00396 {
00397 int outl;
00398 outl = len;
00399 if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len))
00400 return -1;
00401 return 0;
00402 }
00403
00404
00405 void crypto_cipher_deinit(struct crypto_cipher *ctx)
00406 {
00407 EVP_CIPHER_CTX_cleanup(&ctx->enc);
00408 EVP_CIPHER_CTX_cleanup(&ctx->dec);
00409 os_free(ctx);
00410 }
00411
00412
00413 void * dh5_init(struct wpabuf **priv, struct wpabuf **publ)
00414 {
00415 DH *dh;
00416 struct wpabuf *pubkey = NULL, *privkey = NULL;
00417 size_t publen, privlen;
00418
00419 *priv = NULL;
00420 *publ = NULL;
00421
00422 dh = DH_new();
00423 if (dh == NULL)
00424 return NULL;
00425
00426 dh->g = BN_new();
00427 if (dh->g == NULL || BN_set_word(dh->g, 2) != 1)
00428 goto err;
00429
00430 dh->p = get_group5_prime();
00431 if (dh->p == NULL)
00432 goto err;
00433
00434 if (DH_generate_key(dh) != 1)
00435 goto err;
00436
00437 publen = BN_num_bytes(dh->p);
00438 pubkey = wpabuf_alloc(publen);
00439 if (pubkey == NULL)
00440 goto err;
00441 privlen = BN_num_bytes(dh->priv_key);
00442 privkey = wpabuf_alloc(privlen);
00443 if (privkey == NULL)
00444 goto err;
00445
00446 BN_bn2bin(dh->pub_key, wpabuf_put(pubkey, publen));
00447 BN_bn2bin(dh->priv_key, wpabuf_put(privkey, privlen));
00448
00449 *priv = privkey;
00450 *publ = pubkey;
00451 return dh;
00452
00453 err:
00454 wpabuf_free(pubkey);
00455 wpabuf_free(privkey);
00456 DH_free(dh);
00457 return NULL;
00458 }
00459
00460
00461 struct wpabuf * dh5_derive_shared(void *ctx, const struct wpabuf *peer_public,
00462 const struct wpabuf *own_private)
00463 {
00464 BIGNUM *pub_key;
00465 struct wpabuf *res = NULL;
00466 size_t rlen;
00467 DH *dh = ctx;
00468 int keylen;
00469
00470 if (ctx == NULL)
00471 return NULL;
00472
00473 pub_key = BN_bin2bn(wpabuf_head(peer_public), wpabuf_len(peer_public),
00474 NULL);
00475 if (pub_key == NULL)
00476 return NULL;
00477
00478 rlen = DH_size(dh);
00479 res = wpabuf_alloc(rlen);
00480 if (res == NULL)
00481 goto err;
00482
00483 keylen = DH_compute_key(wpabuf_mhead(res), pub_key, dh);
00484 if (keylen < 0)
00485 goto err;
00486 wpabuf_put(res, keylen);
00487 BN_free(pub_key);
00488
00489 return res;
00490
00491 err:
00492 BN_free(pub_key);
00493 wpabuf_free(res);
00494 return NULL;
00495 }
00496
00497
00498 void dh5_free(void *ctx)
00499 {
00500 DH *dh;
00501 if (ctx == NULL)
00502 return;
00503 dh = ctx;
00504 DH_free(dh);
00505 }