contrib/hostapd/src/crypto/crypto_openssl.c

   1 /*
   2  * WPA Supplicant / wrapper functions for libcrypto
   3  * Copyright (c) 2004-2005, 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/md4.h>
  18 #include <openssl/md5.h>
  19 #include <openssl/sha.h>
  20 #include <openssl/des.h>
  21 #include <openssl/aes.h>
  22 #include <openssl/bn.h>
  23 #include <openssl/evp.h>
  24
  25 #include "common.h"
  26 #include "crypto.h"
  27
  28 #if OPENSSL_VERSION_NUMBER < 0x00907000
  29 #define DES_key_schedule des_key_schedule
  30 #define DES_cblock des_cblock
  31 #define DES_set_key(key, schedule) des_set_key((key), *(schedule))
  32 #define DES_ecb_encrypt(input, output, ks, enc) \
  33         des_ecb_encrypt((input), (output), *(ks), (enc))
  34 #endif /* openssl < 0.9.7 */
  35
  36
  37 void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  38 {
  39         MD4_CTX ctx;
  40         size_t i;
  41
  42         MD4_Init(&ctx);
  43         for (i = 0; i < num_elem; i++)
  44                 MD4_Update(&ctx, addr[i], len[i]);
  45         MD4_Final(mac, &ctx);
  46 }
  47
  48
  49 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
  50 {
  51         u8 pkey[8], next, tmp;
  52         int i;
  53         DES_key_schedule ks;
  54
  55         /* Add parity bits to the key */
  56         next = 0;
  57         for (i = 0; i < 7; i++) {
  58                 tmp = key[i];
  59                 pkey[i] = (tmp >> i) | next | 1;
  60                 next = tmp << (7 - i);
  61         }
  62         pkey[i] = next | 1;
  63
  64         DES_set_key(&pkey, &ks);
  65         DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks,
  66                         DES_ENCRYPT);
  67 }
  68
  69
  70 void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  71 {
  72         MD5_CTX ctx;
  73         size_t i;
  74
  75         MD5_Init(&ctx);
  76         for (i = 0; i < num_elem; i++)
  77                 MD5_Update(&ctx, addr[i], len[i]);
  78         MD5_Final(mac, &ctx);
  79 }
  80
  81
  82 void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  83 {
  84         SHA_CTX ctx;
  85         size_t i;
  86
  87         SHA1_Init(&ctx);
  88         for (i = 0; i < num_elem; i++)
  89                 SHA1_Update(&ctx, addr[i], len[i]);
  90         SHA1_Final(mac, &ctx);
  91 }
  92
  93
  94 #ifndef CONFIG_NO_FIPS186_2_PRF
  95 static void sha1_transform(u8 *state, const u8 data[64])
  96 {
  97         SHA_CTX context;
  98         os_memset(&context, 0, sizeof(context));
  99         os_memcpy(&context.h0, state, 5 * 4);
 100         SHA1_Transform(&context, data);
 101         os_memcpy(state, &context.h0, 5 * 4);
 102 }
 103
 104
 105 int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
 106 {
 107         u8 xkey[64];
 108         u32 t[5], _t[5];
 109         int i, j, m, k;
 110         u8 *xpos = x;
 111         u32 carry;
 112
 113         if (seed_len > sizeof(xkey))
 114                 seed_len = sizeof(xkey);
 115
 116         /* FIPS 186-2 + change notice 1 */
 117
 118         os_memcpy(xkey, seed, seed_len);
 119         os_memset(xkey + seed_len, 0, 64 - seed_len);
 120         t[0] = 0x67452301;
 121         t[1] = 0xEFCDAB89;
 122         t[2] = 0x98BADCFE;
 123         t[3] = 0x10325476;
 124         t[4] = 0xC3D2E1F0;
 125
 126         m = xlen / 40;
 127         for (j = 0; j < m; j++) {
 128                 /* XSEED_j = 0 */
 129                 for (i = 0; i < 2; i++) {
 130                         /* XVAL = (XKEY + XSEED_j) mod 2^b */
 131
 132                         /* w_i = G(t, XVAL) */
 133                         os_memcpy(_t, t, 20);
 134                         sha1_transform((u8 *) _t, xkey);
 135                         _t[0] = host_to_be32(_t[0]);
 136                         _t[1] = host_to_be32(_t[1]);
 137                         _t[2] = host_to_be32(_t[2]);
 138                         _t[3] = host_to_be32(_t[3]);
 139                         _t[4] = host_to_be32(_t[4]);
 140                         os_memcpy(xpos, _t, 20);
 141
 142                         /* XKEY = (1 + XKEY + w_i) mod 2^b */
 143                         carry = 1;
 144                         for (k = 19; k >= 0; k--) {
 145                                 carry += xkey[k] + xpos[k];
 146                                 xkey[k] = carry & 0xff;
 147                                 carry >>= 8;
 148                         }
 149
 150                         xpos += 20;
 151                 }
 152                 /* x_j = w_0|w_1 */
 153         }
 154
 155         return 0;
 156 }
 157 #endif /* CONFIG_NO_FIPS186_2_PRF */
 158
 159
 160 void * aes_encrypt_init(const u8 *key, size_t len)
 161 {
 162         AES_KEY *ak;
 163         ak = os_malloc(sizeof(*ak));
 164         if (ak == NULL)
 165                 return NULL;
 166         if (AES_set_encrypt_key(key, 8 * len, ak) < 0) {
 167                 os_free(ak);
 168                 return NULL;
 169         }
 170         return ak;
 171 }
 172
 173
 174 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
 175 {
 176         AES_encrypt(plain, crypt, ctx);
 177 }
 178
 179
 180 void aes_encrypt_deinit(void *ctx)
 181 {
 182         os_free(ctx);
 183 }
 184
 185
 186 void * aes_decrypt_init(const u8 *key, size_t len)
 187 {
 188         AES_KEY *ak;
 189         ak = os_malloc(sizeof(*ak));
 190         if (ak == NULL)
 191                 return NULL;
 192         if (AES_set_decrypt_key(key, 8 * len, ak) < 0) {
 193                 os_free(ak);
 194                 return NULL;
 195         }
 196         return ak;
 197 }
 198
 199
 200 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
 201 {
 202         AES_decrypt(crypt, plain, ctx);
 203 }
 204
 205
 206 void aes_decrypt_deinit(void *ctx)
 207 {
 208         os_free(ctx);
 209 }
 210
 211
 212 int crypto_mod_exp(const u8 *base, size_t base_len,
 213                    const u8 *power, size_t power_len,
 214                    const u8 *modulus, size_t modulus_len,
 215                    u8 *result, size_t *result_len)
 216 {
 217         BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result;
 218         int ret = -1;
 219         BN_CTX *ctx;
 220
 221         ctx = BN_CTX_new();
 222         if (ctx == NULL)
 223                 return -1;
 224
 225         bn_base = BN_bin2bn(base, base_len, NULL);
 226         bn_exp = BN_bin2bn(power, power_len, NULL);
 227         bn_modulus = BN_bin2bn(modulus, modulus_len, NULL);
 228         bn_result = BN_new();
 229
 230         if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
 231             bn_result == NULL)
 232                 goto error;
 233
 234         if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1)
 235                 goto error;
 236
 237         *result_len = BN_bn2bin(bn_result, result);
 238         ret = 0;
 239
 240 error:
 241         BN_free(bn_base);
 242         BN_free(bn_exp);
 243         BN_free(bn_modulus);
 244         BN_free(bn_result);
 245         BN_CTX_free(ctx);
 246         return ret;
 247 }
 248
 249
 250 struct crypto_cipher {
 251         EVP_CIPHER_CTX enc;
 252         EVP_CIPHER_CTX dec;
 253 };
 254
 255
 256 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
 257                                           const u8 *iv, const u8 *key,
 258                                           size_t key_len)
 259 {
 260         struct crypto_cipher *ctx;
 261         const EVP_CIPHER *cipher;
 262
 263         ctx = os_zalloc(sizeof(*ctx));
 264         if (ctx == NULL)
 265                 return NULL;
 266
 267         switch (alg) {
 268 #ifndef OPENSSL_NO_RC4
 269         case CRYPTO_CIPHER_ALG_RC4:
 270                 cipher = EVP_rc4();
 271                 break;
 272 #endif /* OPENSSL_NO_RC4 */
 273 #ifndef OPENSSL_NO_AES
 274         case CRYPTO_CIPHER_ALG_AES:
 275                 switch (key_len) {
 276                 case 16:
 277                         cipher = EVP_aes_128_cbc();
 278                         break;
 279                 case 24:
 280                         cipher = EVP_aes_192_cbc();
 281                         break;
 282                 case 32:
 283                         cipher = EVP_aes_256_cbc();
 284                         break;
 285                 default:
 286                         os_free(ctx);
 287                         return NULL;
 288                 }
 289                 break;
 290 #endif /* OPENSSL_NO_AES */
 291 #ifndef OPENSSL_NO_DES
 292         case CRYPTO_CIPHER_ALG_3DES:
 293                 cipher = EVP_des_ede3_cbc();
 294                 break;
 295         case CRYPTO_CIPHER_ALG_DES:
 296                 cipher = EVP_des_cbc();
 297                 break;
 298 #endif /* OPENSSL_NO_DES */
 299 #ifndef OPENSSL_NO_RC2
 300         case CRYPTO_CIPHER_ALG_RC2:
 301                 cipher = EVP_rc2_ecb();
 302                 break;
 303 #endif /* OPENSSL_NO_RC2 */
 304         default:
 305                 os_free(ctx);
 306                 return NULL;
 307         }
 308
 309         EVP_CIPHER_CTX_init(&ctx->enc);
 310         EVP_CIPHER_CTX_set_padding(&ctx->enc, 0);
 311         if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) ||
 312             !EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) ||
 313             !EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, key, iv)) {
 314                 EVP_CIPHER_CTX_cleanup(&ctx->enc);
 315                 os_free(ctx);
 316                 return NULL;
 317         }
 318
 319         EVP_CIPHER_CTX_init(&ctx->dec);
 320         EVP_CIPHER_CTX_set_padding(&ctx->dec, 0);
 321         if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) ||
 322             !EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) ||
 323             !EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, key, iv)) {
 324                 EVP_CIPHER_CTX_cleanup(&ctx->enc);
 325                 EVP_CIPHER_CTX_cleanup(&ctx->dec);
 326                 os_free(ctx);
 327                 return NULL;
 328         }
 329
 330         return ctx;
 331 }
 332
 333
 334 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
 335                           u8 *crypt, size_t len)
 336 {
 337         int outl;
 338         if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len))
 339                 return -1;
 340         return 0;
 341 }
 342
 343
 344 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
 345                           u8 *plain, size_t len)
 346 {
 347         int outl;
 348         outl = len;
 349         if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len))
 350                 return -1;
 351         return 0;
 352 }
 353
 354
 355 void crypto_cipher_deinit(struct crypto_cipher *ctx)
 356 {
 357         EVP_CIPHER_CTX_cleanup(&ctx->enc);
 358         EVP_CIPHER_CTX_cleanup(&ctx->dec);
 359         os_free(ctx);
 360 }