text: /*
   * Wrapper functions for OpenSSL libcrypto
   * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "includes.h"
  #include <openssl/opensslv.h>
  #include <openssl/err.h>
  #include <openssl/des.h>
  #include <openssl/aes.h>
  #include <openssl/bn.h>
  #include <openssl/evp.h>
  #include <openssl/dh.h>
  #include <openssl/hmac.h>
  #include <openssl/rand.h>
  #ifdef CONFIG_OPENSSL_CMAC
  #include <openssl/cmac.h>
  #endif /* CONFIG_OPENSSL_CMAC */
  #ifdef CONFIG_ECC
  #include <openssl/ec.h>
  #endif /* CONFIG_ECC */
  
  #include "common.h"
  #include "wpabuf.h"
  #include "dh_group5.h"
  #include "sha1.h"
  #include "sha256.h"
  #include "sha384.h"
  #include "crypto.h"
  
  static BIGNUM * get_group5_prime(void)
  {
  #ifdef OPENSSL_IS_BORINGSSL
  	static const unsigned char RFC3526_PRIME_1536[] = {
  		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
  		0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
  		0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
  		0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
  		0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
  		0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
  		0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
  		0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
  		0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
  		0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
  		0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
  		0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
  		0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
  		0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
  		0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
  		0xCA,0x23,0x73,0x27,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  	};
          return BN_bin2bn(RFC3526_PRIME_1536, sizeof(RFC3526_PRIME_1536), NULL);
  #else /* OPENSSL_IS_BORINGSSL */
  	return get_rfc3526_prime_1536(NULL);
  #endif /* OPENSSL_IS_BORINGSSL */
  }
  
  #ifdef OPENSSL_NO_SHA256
  #define NO_SHA256_WRAPPER
  #endif
  
  static int openssl_digest_vector(const EVP_MD *type, size_t num_elem,
  				 const u8 *addr[], const size_t *len, u8 *mac)
  {
  	EVP_MD_CTX ctx;
  	size_t i;
  	unsigned int mac_len;
  
  	EVP_MD_CTX_init(&ctx);
  	if (!EVP_DigestInit_ex(&ctx, type, NULL)) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestInit_ex failed: %s",
  			   ERR_error_string(ERR_get_error(), NULL));
  		return -1;
  	}
  	for (i = 0; i < num_elem; i++) {
  		if (!EVP_DigestUpdate(&ctx, addr[i], len[i])) {
  			wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestUpdate "
  				   "failed: %s",
  				   ERR_error_string(ERR_get_error(), NULL));
  			return -1;
  		}
  	}
  	if (!EVP_DigestFinal(&ctx, mac, &mac_len)) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestFinal failed: %s",
  			   ERR_error_string(ERR_get_error(), NULL));
  		return -1;
  	}
  
  	return 0;
  }
  
  
  #ifndef CONFIG_FIPS
  int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_digest_vector(EVP_md4(), num_elem, addr, len, mac);
  }
  #endif /* CONFIG_FIPS */
  
  
  void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
  {
  	u8 pkey[8], next, tmp;
  	int i;
  	DES_key_schedule ks;
  
  	/* Add parity bits to the key */
  	next = 0;
  	for (i = 0; i < 7; i++) {
  		tmp = key[i];
  		pkey[i] = (tmp >> i) | next | 1;
  		next = tmp << (7 - i);
  	}
  	pkey[i] = next | 1;
  
  	DES_set_key((DES_cblock *) &pkey, &ks);
  	DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks,
  			DES_ENCRYPT);
  }
  
  
  #ifndef CONFIG_NO_RC4
  int rc4_skip(const u8 *key, size_t keylen, size_t skip,
  	     u8 *data, size_t data_len)
  {
  #ifdef OPENSSL_NO_RC4
  	return -1;
  #else /* OPENSSL_NO_RC4 */
  	EVP_CIPHER_CTX ctx;
  	int outl;
  	int res = -1;
  	unsigned char skip_buf[16];
  
  	EVP_CIPHER_CTX_init(&ctx);
  	if (!EVP_CIPHER_CTX_set_padding(&ctx, 0) ||
  	    !EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, NULL, NULL, 1) ||
  	    !EVP_CIPHER_CTX_set_key_length(&ctx, keylen) ||
  	    !EVP_CipherInit_ex(&ctx, NULL, NULL, key, NULL, 1))
  		goto out;
  
  	while (skip >= sizeof(skip_buf)) {
  		size_t len = skip;
  		if (len > sizeof(skip_buf))
  			len = sizeof(skip_buf);
  		if (!EVP_CipherUpdate(&ctx, skip_buf, &outl, skip_buf, len))
  			goto out;
  		skip -= len;
  	}
  
  	if (EVP_CipherUpdate(&ctx, data, &outl, data, data_len))
  		res = 0;
  
  out:
  	EVP_CIPHER_CTX_cleanup(&ctx);
  	return res;
  #endif /* OPENSSL_NO_RC4 */
  }
  #endif /* CONFIG_NO_RC4 */
  
  
  #ifndef CONFIG_FIPS
  int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_digest_vector(EVP_md5(), num_elem, addr, len, mac);
  }
  #endif /* CONFIG_FIPS */
  
  
  int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_digest_vector(EVP_sha1(), num_elem, addr, len, mac);
  }
  
  
  #ifndef NO_SHA256_WRAPPER
  int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
  		  u8 *mac)
  {
  	return openssl_digest_vector(EVP_sha256(), num_elem, addr, len, mac);
  }
  #endif /* NO_SHA256_WRAPPER */
  
  
  static const EVP_CIPHER * aes_get_evp_cipher(size_t keylen)
  {
  	switch (keylen) {
  	case 16:
  		return EVP_aes_128_ecb();
  #ifndef OPENSSL_IS_BORINGSSL
  	case 24:
  		return EVP_aes_192_ecb();
  #endif /* OPENSSL_IS_BORINGSSL */
  	case 32:
  		return EVP_aes_256_ecb();
  	}
  
  	return NULL;
  }
  
  
  void * aes_encrypt_init(const u8 *key, size_t len)
  {
  	EVP_CIPHER_CTX *ctx;
  	const EVP_CIPHER *type;
  
  	type = aes_get_evp_cipher(len);
  	if (type == NULL)
  		return NULL;
  
  	ctx = os_malloc(sizeof(*ctx));
  	if (ctx == NULL)
  		return NULL;
  	EVP_CIPHER_CTX_init(ctx);
  	if (EVP_EncryptInit_ex(ctx, type, NULL, key, NULL) != 1) {
  		os_free(ctx);
  		return NULL;
  	}
  	EVP_CIPHER_CTX_set_padding(ctx, 0);
  	return ctx;
  }
  
  
  void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
  {
  	EVP_CIPHER_CTX *c = ctx;
  	int clen = 16;
  	if (EVP_EncryptUpdate(c, crypt, &clen, plain, 16) != 1) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptUpdate failed: %s",
  			   ERR_error_string(ERR_get_error(), NULL));
  	}
  }
  
  
  void aes_encrypt_deinit(void *ctx)
  {
  	EVP_CIPHER_CTX *c = ctx;
  	u8 buf[16];
  	int len = sizeof(buf);
  	if (EVP_EncryptFinal_ex(c, buf, &len) != 1) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptFinal_ex failed: "
  			   "%s", ERR_error_string(ERR_get_error(), NULL));
  	}
  	if (len != 0) {
  		wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
  			   "in AES encrypt", len);
  	}
  	EVP_CIPHER_CTX_cleanup(c);
  	bin_clear_free(c, sizeof(*c));
  }
  
  
  void * aes_decrypt_init(const u8 *key, size_t len)
  {
  	EVP_CIPHER_CTX *ctx;
  	const EVP_CIPHER *type;
  
  	type = aes_get_evp_cipher(len);
  	if (type == NULL)
  		return NULL;
  
  	ctx = os_malloc(sizeof(*ctx));
  	if (ctx == NULL)
  		return NULL;
  	EVP_CIPHER_CTX_init(ctx);
  	if (EVP_DecryptInit_ex(ctx, type, NULL, key, NULL) != 1) {
  		os_free(ctx);
  		return NULL;
  	}
  	EVP_CIPHER_CTX_set_padding(ctx, 0);
  	return ctx;
  }
  
  
  void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
  {
  	EVP_CIPHER_CTX *c = ctx;
  	int plen = 16;
  	if (EVP_DecryptUpdate(c, plain, &plen, crypt, 16) != 1) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptUpdate failed: %s",
  			   ERR_error_string(ERR_get_error(), NULL));
  	}
  }
  
  
  void aes_decrypt_deinit(void *ctx)
  {
  	EVP_CIPHER_CTX *c = ctx;
  	u8 buf[16];
  	int len = sizeof(buf);
  	if (EVP_DecryptFinal_ex(c, buf, &len) != 1) {
  		wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptFinal_ex failed: "
  			   "%s", ERR_error_string(ERR_get_error(), NULL));
  	}
  	if (len != 0) {
  		wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
  			   "in AES decrypt", len);
  	}
  	EVP_CIPHER_CTX_cleanup(c);
  	bin_clear_free(c, sizeof(*c));
  }
  
  
  #ifndef CONFIG_FIPS
  
  int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher)
  {
  	AES_KEY actx;
  	int res;
  
  	if (AES_set_encrypt_key(kek, kek_len << 3, &actx))
  		return -1;
  	res = AES_wrap_key(&actx, NULL, cipher, plain, n * 8);
  	OPENSSL_cleanse(&actx, sizeof(actx));
  	return res <= 0 ? -1 : 0;
  }
  
  
  int aes_unwrap(const u8 *kek, size_t kek_len, int n, const u8 *cipher,
  	       u8 *plain)
  {
  	AES_KEY actx;
  	int res;
  
  	if (AES_set_decrypt_key(kek, kek_len << 3, &actx))
  		return -1;
  	res = AES_unwrap_key(&actx, NULL, plain, cipher, (n + 1) * 8);
  	OPENSSL_cleanse(&actx, sizeof(actx));
  	return res <= 0 ? -1 : 0;
  }
  
  #endif /* CONFIG_FIPS */
  
  
  int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
  {
  	EVP_CIPHER_CTX ctx;
  	int clen, len;
  	u8 buf[16];
  
  	EVP_CIPHER_CTX_init(&ctx);
  	if (EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
  		return -1;
  	EVP_CIPHER_CTX_set_padding(&ctx, 0);
  
  	clen = data_len;
  	if (EVP_EncryptUpdate(&ctx, data, &clen, data, data_len) != 1 ||
  	    clen != (int) data_len)
  		return -1;
  
  	len = sizeof(buf);
  	if (EVP_EncryptFinal_ex(&ctx, buf, &len) != 1 || len != 0)
  		return -1;
  	EVP_CIPHER_CTX_cleanup(&ctx);
  
  	return 0;
  }
  
  
  int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
  {
  	EVP_CIPHER_CTX ctx;
  	int plen, len;
  	u8 buf[16];
  
  	EVP_CIPHER_CTX_init(&ctx);
  	if (EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
  		return -1;
  	EVP_CIPHER_CTX_set_padding(&ctx, 0);
  
  	plen = data_len;
  	if (EVP_DecryptUpdate(&ctx, data, &plen, data, data_len) != 1 ||
  	    plen != (int) data_len)
  		return -1;
  
  	len = sizeof(buf);
  	if (EVP_DecryptFinal_ex(&ctx, buf, &len) != 1 || len != 0)
  		return -1;
  	EVP_CIPHER_CTX_cleanup(&ctx);
  
  	return 0;
  }
  
  
  int crypto_mod_exp(const u8 *base, size_t base_len,
  		   const u8 *power, size_t power_len,
  		   const u8 *modulus, size_t modulus_len,
  		   u8 *result, size_t *result_len)
  {
  	BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result;
  	int ret = -1;
  	BN_CTX *ctx;
  
  	ctx = BN_CTX_new();
  	if (ctx == NULL)
  		return -1;
  
  	bn_base = BN_bin2bn(base, base_len, NULL);
  	bn_exp = BN_bin2bn(power, power_len, NULL);
  	bn_modulus = BN_bin2bn(modulus, modulus_len, NULL);
  	bn_result = BN_new();
  
  	if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
  	    bn_result == NULL)
  		goto error;
  
  	if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1)
  		goto error;
  
  	*result_len = BN_bn2bin(bn_result, result);
  	ret = 0;
  
  error:
  	BN_clear_free(bn_base);
  	BN_clear_free(bn_exp);
  	BN_clear_free(bn_modulus);
  	BN_clear_free(bn_result);
  	BN_CTX_free(ctx);
  	return ret;
  }
  
  
  struct crypto_cipher {
  	EVP_CIPHER_CTX enc;
  	EVP_CIPHER_CTX dec;
  };
  
  
  struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
  					  const u8 *iv, const u8 *key,
  					  size_t key_len)
  {
  	struct crypto_cipher *ctx;
  	const EVP_CIPHER *cipher;
  
  	ctx = os_zalloc(sizeof(*ctx));
  	if (ctx == NULL)
  		return NULL;
  
  	switch (alg) {
  #ifndef CONFIG_NO_RC4
  #ifndef OPENSSL_NO_RC4
  	case CRYPTO_CIPHER_ALG_RC4:
  		cipher = EVP_rc4();
  		break;
  #endif /* OPENSSL_NO_RC4 */
  #endif /* CONFIG_NO_RC4 */
  #ifndef OPENSSL_NO_AES
  	case CRYPTO_CIPHER_ALG_AES:
  		switch (key_len) {
  		case 16:
  			cipher = EVP_aes_128_cbc();
  			break;
  #ifndef OPENSSL_IS_BORINGSSL
  		case 24:
  			cipher = EVP_aes_192_cbc();
  			break;
  #endif /* OPENSSL_IS_BORINGSSL */
  		case 32:
  			cipher = EVP_aes_256_cbc();
  			break;
  		default:
  			os_free(ctx);
  			return NULL;
  		}
  		break;
  #endif /* OPENSSL_NO_AES */
  #ifndef OPENSSL_NO_DES
  	case CRYPTO_CIPHER_ALG_3DES:
  		cipher = EVP_des_ede3_cbc();
  		break;
  	case CRYPTO_CIPHER_ALG_DES:
  		cipher = EVP_des_cbc();
  		break;
  #endif /* OPENSSL_NO_DES */
  #ifndef OPENSSL_NO_RC2
  	case CRYPTO_CIPHER_ALG_RC2:
  		cipher = EVP_rc2_ecb();
  		break;
  #endif /* OPENSSL_NO_RC2 */
  	default:
  		os_free(ctx);
  		return NULL;
  	}
  
  	EVP_CIPHER_CTX_init(&ctx->enc);
  	EVP_CIPHER_CTX_set_padding(&ctx->enc, 0);
  	if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) ||
  	    !EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) ||
  	    !EVP_EncryptInit_ex(&ctx->enc, NULL, NULL, key, iv)) {
  		EVP_CIPHER_CTX_cleanup(&ctx->enc);
  		os_free(ctx);
  		return NULL;
  	}
  
  	EVP_CIPHER_CTX_init(&ctx->dec);
  	EVP_CIPHER_CTX_set_padding(&ctx->dec, 0);
  	if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) ||
  	    !EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) ||
  	    !EVP_DecryptInit_ex(&ctx->dec, NULL, NULL, key, iv)) {
  		EVP_CIPHER_CTX_cleanup(&ctx->enc);
  		EVP_CIPHER_CTX_cleanup(&ctx->dec);
  		os_free(ctx);
  		return NULL;
  	}
  
  	return ctx;
  }
  
  
  int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
  			  u8 *crypt, size_t len)
  {
  	int outl;
  	if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len))
  		return -1;
  	return 0;
  }
  
  
  int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
  			  u8 *plain, size_t len)
  {
  	int outl;
  	outl = len;
  	if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len))
  		return -1;
  	return 0;
  }
  
  
  void crypto_cipher_deinit(struct crypto_cipher *ctx)
  {
  	EVP_CIPHER_CTX_cleanup(&ctx->enc);
  	EVP_CIPHER_CTX_cleanup(&ctx->dec);
  	os_free(ctx);
  }
  
  
  void * dh5_init(struct wpabuf **priv, struct wpabuf **publ)
  {
  	DH *dh;
  	struct wpabuf *pubkey = NULL, *privkey = NULL;
  	size_t publen, privlen;
  
  	*priv = NULL;
  	*publ = NULL;
  
  	dh = DH_new();
  	if (dh == NULL)
  		return NULL;
  
  	dh->g = BN_new();
  	if (dh->g == NULL || BN_set_word(dh->g, 2) != 1)
  		goto err;
  
  	dh->p = get_group5_prime();
  	if (dh->p == NULL)
  		goto err;
  
  	if (DH_generate_key(dh) != 1)
  		goto err;
  
  	publen = BN_num_bytes(dh->pub_key);
  	pubkey = wpabuf_alloc(publen);
  	if (pubkey == NULL)
  		goto err;
  	privlen = BN_num_bytes(dh->priv_key);
  	privkey = wpabuf_alloc(privlen);
  	if (privkey == NULL)
  		goto err;
  
  	BN_bn2bin(dh->pub_key, wpabuf_put(pubkey, publen));
  	BN_bn2bin(dh->priv_key, wpabuf_put(privkey, privlen));
  
  	*priv = privkey;
  	*publ = pubkey;
  	return dh;
  
  err:
  	wpabuf_clear_free(pubkey);
  	wpabuf_clear_free(privkey);
  	DH_free(dh);
  	return NULL;
  }
  
  
  void * dh5_init_fixed(const struct wpabuf *priv, const struct wpabuf *publ)
  {
  	DH *dh;
  
  	dh = DH_new();
  	if (dh == NULL)
  		return NULL;
  
  	dh->g = BN_new();
  	if (dh->g == NULL || BN_set_word(dh->g, 2) != 1)
  		goto err;
  
  	dh->p = get_group5_prime();
  	if (dh->p == NULL)
  		goto err;
  
  	dh->priv_key = BN_bin2bn(wpabuf_head(priv), wpabuf_len(priv), NULL);
  	if (dh->priv_key == NULL)
  		goto err;
  
  	dh->pub_key = BN_bin2bn(wpabuf_head(publ), wpabuf_len(publ), NULL);
  	if (dh->pub_key == NULL)
  		goto err;
  
  	if (DH_generate_key(dh) != 1)
  		goto err;
  
  	return dh;
  
  err:
  	DH_free(dh);
  	return NULL;
  }
  
  
  struct wpabuf * dh5_derive_shared(void *ctx, const struct wpabuf *peer_public,
  				  const struct wpabuf *own_private)
  {
  	BIGNUM *pub_key;
  	struct wpabuf *res = NULL;
  	size_t rlen;
  	DH *dh = ctx;
  	int keylen;
  
  	if (ctx == NULL)
  		return NULL;
  
  	pub_key = BN_bin2bn(wpabuf_head(peer_public), wpabuf_len(peer_public),
  			    NULL);
  	if (pub_key == NULL)
  		return NULL;
  
  	rlen = DH_size(dh);
  	res = wpabuf_alloc(rlen);
  	if (res == NULL)
  		goto err;
  
  	keylen = DH_compute_key(wpabuf_mhead(res), pub_key, dh);
  	if (keylen < 0)
  		goto err;
  	wpabuf_put(res, keylen);
  	BN_clear_free(pub_key);
  
  	return res;
  
  err:
  	BN_clear_free(pub_key);
  	wpabuf_clear_free(res);
  	return NULL;
  }
  
  
  void dh5_free(void *ctx)
  {
  	DH *dh;
  	if (ctx == NULL)
  		return;
  	dh = ctx;
  	DH_free(dh);
  }
  
  
  struct crypto_hash {
  	HMAC_CTX ctx;
  };
  
  
  struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
  				      size_t key_len)
  {
  	struct crypto_hash *ctx;
  	const EVP_MD *md;
  
  	switch (alg) {
  #ifndef OPENSSL_NO_MD5
  	case CRYPTO_HASH_ALG_HMAC_MD5:
  		md = EVP_md5();
  		break;
  #endif /* OPENSSL_NO_MD5 */
  #ifndef OPENSSL_NO_SHA
  	case CRYPTO_HASH_ALG_HMAC_SHA1:
  		md = EVP_sha1();
  		break;
  #endif /* OPENSSL_NO_SHA */
  #ifndef OPENSSL_NO_SHA256
  #ifdef CONFIG_SHA256
  	case CRYPTO_HASH_ALG_HMAC_SHA256:
  		md = EVP_sha256();
  		break;
  #endif /* CONFIG_SHA256 */
  #endif /* OPENSSL_NO_SHA256 */
  	default:
  		return NULL;
  	}
  
  	ctx = os_zalloc(sizeof(*ctx));
  	if (ctx == NULL)
  		return NULL;
  	HMAC_CTX_init(&ctx->ctx);
  
  #if OPENSSL_VERSION_NUMBER < 0x00909000
  	HMAC_Init_ex(&ctx->ctx, key, key_len, md, NULL);
  #else /* openssl < 0.9.9 */
  	if (HMAC_Init_ex(&ctx->ctx, key, key_len, md, NULL) != 1) {
  		bin_clear_free(ctx, sizeof(*ctx));
  		return NULL;
  	}
  #endif /* openssl < 0.9.9 */
  
  	return ctx;
  }
  
  
  void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
  {
  	if (ctx == NULL)
  		return;
  	HMAC_Update(&ctx->ctx, data, len);
  }
  
  
  int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
  {
  	unsigned int mdlen;
  	int res;
  
  	if (ctx == NULL)
  		return -2;
  
  	if (mac == NULL || len == NULL) {
  		bin_clear_free(ctx, sizeof(*ctx));
  		return 0;
  	}
  
  	mdlen = *len;
  #if OPENSSL_VERSION_NUMBER < 0x00909000
  	HMAC_Final(&ctx->ctx, mac, &mdlen);
  	res = 1;
  #else /* openssl < 0.9.9 */
  	res = HMAC_Final(&ctx->ctx, mac, &mdlen);
  #endif /* openssl < 0.9.9 */
  	HMAC_CTX_cleanup(&ctx->ctx);
  	bin_clear_free(ctx, sizeof(*ctx));
  
  	if (res == 1) {
  		*len = mdlen;
  		return 0;
  	}
  
  	return -1;
  }
  
  
  static int openssl_hmac_vector(const EVP_MD *type, const u8 *key,
  			       size_t key_len, size_t num_elem,
  			       const u8 *addr[], const size_t *len, u8 *mac,
  			       unsigned int mdlen)
  {
  	HMAC_CTX ctx;
  	size_t i;
  	int res;
  
  	HMAC_CTX_init(&ctx);
  #if OPENSSL_VERSION_NUMBER < 0x00909000
  	HMAC_Init_ex(&ctx, key, key_len, type, NULL);
  #else /* openssl < 0.9.9 */
  	if (HMAC_Init_ex(&ctx, key, key_len, type, NULL) != 1)
  		return -1;
  #endif /* openssl < 0.9.9 */
  
  	for (i = 0; i < num_elem; i++)
  		HMAC_Update(&ctx, addr[i], len[i]);
  
  #if OPENSSL_VERSION_NUMBER < 0x00909000
  	HMAC_Final(&ctx, mac, &mdlen);
  	res = 1;
  #else /* openssl < 0.9.9 */
  	res = HMAC_Final(&ctx, mac, &mdlen);
  #endif /* openssl < 0.9.9 */
  	HMAC_CTX_cleanup(&ctx);
  
  	return res == 1 ? 0 : -1;
  }
  
  
  #ifndef CONFIG_FIPS
  
  int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
  		    const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_hmac_vector(EVP_md5(), key ,key_len, num_elem, addr, len,
  				   mac, 16);
  }
  
  
  int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
  	     u8 *mac)
  {
  	return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
  }
  
  #endif /* CONFIG_FIPS */
  
  
  int pbkdf2_sha1(const char *passphrase, const u8 *ssid, size_t ssid_len,
  		int iterations, u8 *buf, size_t buflen)
  {
  	if (PKCS5_PBKDF2_HMAC_SHA1(passphrase, os_strlen(passphrase), ssid,
  				   ssid_len, iterations, buflen, buf) != 1)
  		return -1;
  	return 0;
  }
  
  
  int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem,
  		     const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_hmac_vector(EVP_sha1(), key, key_len, num_elem, addr,
  				   len, mac, 20);
  }
  
  
  int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
  	       u8 *mac)
  {
  	return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac);
  }
  
  
  #ifdef CONFIG_SHA256
  
  int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
  		       const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_hmac_vector(EVP_sha256(), key, key_len, num_elem, addr,
  				   len, mac, 32);
  }
  
  
  int hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
  		size_t data_len, u8 *mac)
  {
  	return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
  }
  
  #endif /* CONFIG_SHA256 */
  
  
  #ifdef CONFIG_SHA384
  
  int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
  		       const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return openssl_hmac_vector(EVP_sha384(), key, key_len, num_elem, addr,
  				   len, mac, 32);
  }
  
  
  int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
  		size_t data_len, u8 *mac)
  {
  	return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
  }
  
  #endif /* CONFIG_SHA384 */
  
  
  int crypto_get_random(void *buf, size_t len)
  {
  	if (RAND_bytes(buf, len) != 1)
  		return -1;
  	return 0;
  }
  
  
  #ifdef CONFIG_OPENSSL_CMAC
  int omac1_aes_vector(const u8 *key, size_t key_len, size_t num_elem,
  		     const u8 *addr[], const size_t *len, u8 *mac)
  {
  	CMAC_CTX *ctx;
  	int ret = -1;
  	size_t outlen, i;
  
  	ctx = CMAC_CTX_new();
  	if (ctx == NULL)
  		return -1;
  
  	if (key_len == 32) {
  		if (!CMAC_Init(ctx, key, 32, EVP_aes_256_cbc(), NULL))
  			goto fail;
  	} else if (key_len == 16) {
  		if (!CMAC_Init(ctx, key, 16, EVP_aes_128_cbc(), NULL))
  			goto fail;
  	} else {
  		goto fail;
  	}
  	for (i = 0; i < num_elem; i++) {
  		if (!CMAC_Update(ctx, addr[i], len[i]))
  			goto fail;
  	}
  	if (!CMAC_Final(ctx, mac, &outlen) || outlen != 16)
  		goto fail;
  
  	ret = 0;
  fail:
  	CMAC_CTX_free(ctx);
  	return ret;
  }
  
  
  int omac1_aes_128_vector(const u8 *key, size_t num_elem,
  			 const u8 *addr[], const size_t *len, u8 *mac)
  {
  	return omac1_aes_vector(key, 16, num_elem, addr, len, mac);
  }
  
  
  int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
  {
  	return omac1_aes_128_vector(key, 1, &data, &data_len, mac);
  }
  
  
  int omac1_aes_256(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
  {
  	return omac1_aes_vector(key, 32, 1, &data, &data_len, mac);
  }
  #endif /* CONFIG_OPENSSL_CMAC */
  
  
  struct crypto_bignum * crypto_bignum_init(void)
  {
  	return (struct crypto_bignum *) BN_new();
  }
  
  
  struct crypto_bignum * crypto_bignum_init_set(const u8 *buf, size_t len)
  {
  	BIGNUM *bn = BN_bin2bn(buf, len, NULL);
  	return (struct crypto_bignum *) bn;
  }
  
  
  void crypto_bignum_deinit(struct crypto_bignum *n, int clear)
  {
  	if (clear)
  		BN_clear_free((BIGNUM *) n);
  	else
  		BN_free((BIGNUM *) n);
  }
  
  
  int crypto_bignum_to_bin(const struct crypto_bignum *a,
  			 u8 *buf, size_t buflen, size_t padlen)
  {
  	int num_bytes, offset;
  
  	if (padlen > buflen)
  		return -1;
  
  	num_bytes = BN_num_bytes((const BIGNUM *) a);
  	if ((size_t) num_bytes > buflen)
  		return -1;
  	if (padlen > (size_t) num_bytes)
  		offset = padlen - num_bytes;
  	else
  		offset = 0;
  
  	os_memset(buf, 0, offset);
  	BN_bn2bin((const BIGNUM *) a, buf + offset);
  
  	return num_bytes + offset;
  }
  
  
  int crypto_bignum_add(const struct crypto_bignum *a,
  		      const struct crypto_bignum *b,
  		      struct crypto_bignum *c)
  {
  	return BN_add((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
  		0 : -1;
  }
  
  
  int crypto_bignum_mod(const struct crypto_bignum *a,
  		      const struct crypto_bignum *b,
  		      struct crypto_bignum *c)
  {
  	int res;
  	BN_CTX *bnctx;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -1;
  	res = BN_mod((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b,
  		     bnctx);
  	BN_CTX_free(bnctx);
  
  	return res ? 0 : -1;
  }
  
  
  int crypto_bignum_exptmod(const struct crypto_bignum *a,
  			  const struct crypto_bignum *b,
  			  const struct crypto_bignum *c,
  			  struct crypto_bignum *d)
  {
  	int res;
  	BN_CTX *bnctx;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -1;
  	res = BN_mod_exp((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
  			 (const BIGNUM *) c, bnctx);
  	BN_CTX_free(bnctx);
  
  	return res ? 0 : -1;
  }
  
  
  int crypto_bignum_inverse(const struct crypto_bignum *a,
  			  const struct crypto_bignum *b,
  			  struct crypto_bignum *c)
  {
  	BIGNUM *res;
  	BN_CTX *bnctx;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -1;
  	res = BN_mod_inverse((BIGNUM *) c, (const BIGNUM *) a,
  			     (const BIGNUM *) b, bnctx);
  	BN_CTX_free(bnctx);
  
  	return res ? 0 : -1;
  }
  
  
  int crypto_bignum_sub(const struct crypto_bignum *a,
  		      const struct crypto_bignum *b,
  		      struct crypto_bignum *c)
  {
  	return BN_sub((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
  		0 : -1;
  }
  
  
  int crypto_bignum_div(const struct crypto_bignum *a,
  		      const struct crypto_bignum *b,
  		      struct crypto_bignum *c)
  {
  	int res;
  
  	BN_CTX *bnctx;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -1;
  	res = BN_div((BIGNUM *) c, NULL, (const BIGNUM *) a,
  		     (const BIGNUM *) b, bnctx);
  	BN_CTX_free(bnctx);
  
  	return res ? 0 : -1;
  }
  
  
  int crypto_bignum_mulmod(const struct crypto_bignum *a,
  			 const struct crypto_bignum *b,
  			 const struct crypto_bignum *c,
  			 struct crypto_bignum *d)
  {
  	int res;
  
  	BN_CTX *bnctx;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -1;
  	res = BN_mod_mul((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
  			 (const BIGNUM *) c, bnctx);
  	BN_CTX_free(bnctx);
  
  	return res ? 0 : -1;
  }
  
  
  int crypto_bignum_cmp(const struct crypto_bignum *a,
  		      const struct crypto_bignum *b)
  {
  	return BN_cmp((const BIGNUM *) a, (const BIGNUM *) b);
  }
  
  
  int crypto_bignum_bits(const struct crypto_bignum *a)
  {
  	return BN_num_bits((const BIGNUM *) a);
  }
  
  
  int crypto_bignum_is_zero(const struct crypto_bignum *a)
  {
  	return BN_is_zero((const BIGNUM *) a);
  }
  
  
  int crypto_bignum_is_one(const struct crypto_bignum *a)
  {
  	return BN_is_one((const BIGNUM *) a);
  }
  
  
  int crypto_bignum_legendre(const struct crypto_bignum *a,
  			   const struct crypto_bignum *p)
  {
  	BN_CTX *bnctx;
  	BIGNUM *exp = NULL, *tmp = NULL;
  	int res = -2;
  
  	bnctx = BN_CTX_new();
  	if (bnctx == NULL)
  		return -2;
  
  	exp = BN_new();
  	tmp = BN_new();
  	if (!exp || !tmp ||
  	    /* exp = (p-1) / 2 */
  	    !BN_sub(exp, (const BIGNUM *) p, BN_value_one()) ||
  	    !BN_rshift1(exp, exp) ||
  	    !BN_mod_exp(tmp, (const BIGNUM *) a, exp, (const BIGNUM *) p,
  			bnctx))
  		goto fail;
  
  	if (BN_is_word(tmp, 1))
  		res = 1;
  	else if (BN_is_zero(tmp))
  		res = 0;
  	else
  		res = -1;
  
  fail:
  	BN_clear_free(tmp);
  	BN_clear_free(exp);
  	BN_CTX_free(bnctx);
  	return res;
  }
  
  
  #ifdef CONFIG_ECC
  
  struct crypto_ec {
  	EC_GROUP *group;
  	BN_CTX *bnctx;
  	BIGNUM *prime;
  	BIGNUM *order;
  	BIGNUM *a;
  	BIGNUM *b;
  };
  
  struct crypto_ec * crypto_ec_init(int group)
  {
  	struct crypto_ec *e;
  	int nid;
  
  	/* Map from IANA registry for IKE D-H groups to OpenSSL NID */
  	switch (group) {
  	case 19:
  		nid = NID_X9_62_prime256v1;
  		break;
  	case 20:
  		nid = NID_secp384r1;
  		break;
  	case 21:
  		nid = NID_secp521r1;
  		break;
  	case 25:
  		nid = NID_X9_62_prime192v1;
  		break;
  	case 26:
  		nid = NID_secp224r1;
  		break;
  #ifdef NID_brainpoolP224r1
  	case 27:
  		nid = NID_brainpoolP224r1;
  		break;
  #endif /* NID_brainpoolP224r1 */
  #ifdef NID_brainpoolP256r1
  	case 28:
  		nid = NID_brainpoolP256r1;
  		break;
  #endif /* NID_brainpoolP256r1 */
  #ifdef NID_brainpoolP384r1
  	case 29:
  		nid = NID_brainpoolP384r1;
  		break;
  #endif /* NID_brainpoolP384r1 */
  #ifdef NID_brainpoolP512r1
  	case 30:
  		nid = NID_brainpoolP512r1;
  		break;
  #endif /* NID_brainpoolP512r1 */
  	default:
  		return NULL;
  	}
  
  	e = os_zalloc(sizeof(*e));
  	if (e == NULL)
  		return NULL;
  
  	e->bnctx = BN_CTX_new();
  	e->group = EC_GROUP_new_by_curve_name(nid);
  	e->prime = BN_new();
  	e->order = BN_new();
  	e->a = BN_new();
  	e->b = BN_new();
  	if (e->group == NULL || e->bnctx == NULL || e->prime == NULL ||
  	    e->order == NULL || e->a == NULL || e->b == NULL ||
  	    !EC_GROUP_get_curve_GFp(e->group, e->prime, e->a, e->b, e->bnctx) ||
  	    !EC_GROUP_get_order(e->group, e->order, e->bnctx)) {
  		crypto_ec_deinit(e);
  		e = NULL;
  	}
  
  	return e;
  }
  
  
  void crypto_ec_deinit(struct crypto_ec *e)
  {
  	if (e == NULL)
  		return;
  	BN_clear_free(e->b);
  	BN_clear_free(e->a);
  	BN_clear_free(e->order);
  	BN_clear_free(e->prime);
  	EC_GROUP_free(e->group);
  	BN_CTX_free(e->bnctx);
  	os_free(e);
  }
  
  
  struct crypto_ec_point * crypto_ec_point_init(struct crypto_ec *e)
  {
  	if (e == NULL)
  		return NULL;
  	return (struct crypto_ec_point *) EC_POINT_new(e->group);
  }
  
  
  size_t crypto_ec_prime_len(struct crypto_ec *e)
  {
  	return BN_num_bytes(e->prime);
  }
  
  
  size_t crypto_ec_prime_len_bits(struct crypto_ec *e)
  {
  	return BN_num_bits(e->prime);
  }
  
  
  const struct crypto_bignum * crypto_ec_get_prime(struct crypto_ec *e)
  {
  	return (const struct crypto_bignum *) e->prime;
  }
  
  
  const struct crypto_bignum * crypto_ec_get_order(struct crypto_ec *e)
  {
  	return (const struct crypto_bignum *) e->order;
  }
  
  
  void crypto_ec_point_deinit(struct crypto_ec_point *p, int clear)
  {
  	if (clear)
  		EC_POINT_clear_free((EC_POINT *) p);
  	else
  		EC_POINT_free((EC_POINT *) p);
  }
  
  
  int crypto_ec_point_to_bin(struct crypto_ec *e,
  			   const struct crypto_ec_point *point, u8 *x, u8 *y)
  {
  	BIGNUM *x_bn, *y_bn;
  	int ret = -1;
  	int len = BN_num_bytes(e->prime);
  
  	x_bn = BN_new();
  	y_bn = BN_new();
  
  	if (x_bn && y_bn &&
  	    EC_POINT_get_affine_coordinates_GFp(e->group, (EC_POINT *) point,
  						x_bn, y_bn, e->bnctx)) {
  		if (x) {
  			crypto_bignum_to_bin((struct crypto_bignum *) x_bn,
  					     x, len, len);
  		}
  		if (y) {
  			crypto_bignum_to_bin((struct crypto_bignum *) y_bn,
  					     y, len, len);
  		}
  		ret = 0;
  	}
  
  	BN_clear_free(x_bn);
  	BN_clear_free(y_bn);
  	return ret;
  }
  
  
  struct crypto_ec_point * crypto_ec_point_from_bin(struct crypto_ec *e,
  						  const u8 *val)
  {
  	BIGNUM *x, *y;
  	EC_POINT *elem;
  	int len = BN_num_bytes(e->prime);
  
  	x = BN_bin2bn(val, len, NULL);
  	y = BN_bin2bn(val + len, len, NULL);
  	elem = EC_POINT_new(e->group);
  	if (x == NULL || y == NULL || elem == NULL) {
  		BN_clear_free(x);
  		BN_clear_free(y);
  		EC_POINT_clear_free(elem);
  		return NULL;
  	}
  
  	if (!EC_POINT_set_affine_coordinates_GFp(e->group, elem, x, y,
  						 e->bnctx)) {
  		EC_POINT_clear_free(elem);
  		elem = NULL;
  	}
  
  	BN_clear_free(x);
  	BN_clear_free(y);
  
  	return (struct crypto_ec_point *) elem;
  }
  
  
  int crypto_ec_point_add(struct crypto_ec *e, const struct crypto_ec_point *a,
  			const struct crypto_ec_point *b,
  			struct crypto_ec_point *c)
  {
  	return EC_POINT_add(e->group, (EC_POINT *) c, (const EC_POINT *) a,
  			    (const EC_POINT *) b, e->bnctx) ? 0 : -1;
  }
  
  
  int crypto_ec_point_mul(struct crypto_ec *e, const struct crypto_ec_point *p,
  			const struct crypto_bignum *b,
  			struct crypto_ec_point *res)
  {
  	return EC_POINT_mul(e->group, (EC_POINT *) res, NULL,
  			    (const EC_POINT *) p, (const BIGNUM *) b, e->bnctx)
  		? 0 : -1;
  }
  
  
  int crypto_ec_point_invert(struct crypto_ec *e, struct crypto_ec_point *p)
  {
  	return EC_POINT_invert(e->group, (EC_POINT *) p, e->bnctx) ? 0 : -1;
  }
  
  
  int crypto_ec_point_solve_y_coord(struct crypto_ec *e,
  				  struct crypto_ec_point *p,
  				  const struct crypto_bignum *x, int y_bit)
  {
  	if (!EC_POINT_set_compressed_coordinates_GFp(e->group, (EC_POINT *) p,
  						     (const BIGNUM *) x, y_bit,
  						     e->bnctx) ||
  	    !EC_POINT_is_on_curve(e->group, (EC_POINT *) p, e->bnctx))
  		return -1;
  	return 0;
  }
  
  
  struct crypto_bignum *
  crypto_ec_point_compute_y_sqr(struct crypto_ec *e,
  			      const struct crypto_bignum *x)
  {
  	BIGNUM *tmp, *tmp2, *y_sqr = NULL;
  
  	tmp = BN_new();
  	tmp2 = BN_new();
  
  	/* y^2 = x^3 + ax + b */
  	if (tmp && tmp2 &&
  	    BN_mod_sqr(tmp, (const BIGNUM *) x, e->prime, e->bnctx) &&
  	    BN_mod_mul(tmp, tmp, (const BIGNUM *) x, e->prime, e->bnctx) &&
  	    BN_mod_mul(tmp2, e->a, (const BIGNUM *) x, e->prime, e->bnctx) &&
  	    BN_mod_add_quick(tmp2, tmp2, tmp, e->prime) &&
  	    BN_mod_add_quick(tmp2, tmp2, e->b, e->prime)) {
  		y_sqr = tmp2;
  		tmp2 = NULL;
  	}
  
  	BN_clear_free(tmp);
  	BN_clear_free(tmp2);
  
  	return (struct crypto_bignum *) y_sqr;
  }
  
  
  int crypto_ec_point_is_at_infinity(struct crypto_ec *e,
  				   const struct crypto_ec_point *p)
  {
  	return EC_POINT_is_at_infinity(e->group, (const EC_POINT *) p);
  }
  
  
  int crypto_ec_point_is_on_curve(struct crypto_ec *e,
  				const struct crypto_ec_point *p)
  {
  	return EC_POINT_is_on_curve(e->group, (const EC_POINT *) p,
  				    e->bnctx) == 1;
  }
  
  
  int crypto_ec_point_cmp(const struct crypto_ec *e,
  			const struct crypto_ec_point *a,
  			const struct crypto_ec_point *b)
  {
  	return EC_POINT_cmp(e->group, (const EC_POINT *) a,
  			    (const EC_POINT *) b, e->bnctx);
  }
  
  #endif /* CONFIG_ECC */
  