/*
 * Copyright (C) 2008-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

#ifndef GNUTLS_CRYPTO_H
#define GNUTLS_CRYPTO_H

/* *INDENT-OFF* */
#ifdef __cplusplus
extern "C" {
#endif
/* *INDENT-ON* */

typedef struct api_cipher_hd_st *gnutls_cipher_hd_t;

int gnutls_cipher_init(gnutls_cipher_hd_t * handle,
		       gnutls_cipher_algorithm_t cipher,
		       const gnutls_datum_t * key,
		       const gnutls_datum_t * iv);
int gnutls_cipher_encrypt(const gnutls_cipher_hd_t handle,
			  void *text, size_t textlen);
int gnutls_cipher_decrypt(const gnutls_cipher_hd_t handle,
			  void *ciphertext, size_t ciphertextlen);
int gnutls_cipher_decrypt2(gnutls_cipher_hd_t handle,
			   const void *ciphertext,
			   size_t ciphertextlen, void *text,
			   size_t textlen);
int gnutls_cipher_encrypt2(gnutls_cipher_hd_t handle,
			   const void *text, size_t textlen,
			   void *ciphertext, size_t ciphertextlen);

void gnutls_cipher_set_iv(gnutls_cipher_hd_t handle, void *iv,
			  size_t ivlen);

int gnutls_cipher_tag(gnutls_cipher_hd_t handle, void *tag,
		      size_t tag_size);
int gnutls_cipher_add_auth(gnutls_cipher_hd_t handle,
			   const void *text, size_t text_size);

void gnutls_cipher_deinit(gnutls_cipher_hd_t handle);
int gnutls_cipher_get_block_size(gnutls_cipher_algorithm_t algorithm);
int gnutls_cipher_get_iv_size(gnutls_cipher_algorithm_t algorithm);
int gnutls_cipher_get_tag_size(gnutls_cipher_algorithm_t algorithm);

typedef struct hash_hd_st *gnutls_hash_hd_t;
typedef struct hmac_hd_st *gnutls_hmac_hd_t;

size_t gnutls_mac_get_nonce_size(gnutls_mac_algorithm_t algorithm);
int gnutls_hmac_init(gnutls_hmac_hd_t * dig,
		     gnutls_mac_algorithm_t algorithm,
		     const void *key, size_t keylen);
void gnutls_hmac_set_nonce(gnutls_hmac_hd_t handle,
			   const void *nonce, size_t nonce_len);
int gnutls_hmac(gnutls_hmac_hd_t handle, const void *text, size_t textlen);
void gnutls_hmac_output(gnutls_hmac_hd_t handle, void *digest);
void gnutls_hmac_deinit(gnutls_hmac_hd_t handle, void *digest);
int gnutls_hmac_get_len(gnutls_mac_algorithm_t algorithm);
int gnutls_hmac_fast(gnutls_mac_algorithm_t algorithm,
		     const void *key, size_t keylen,
		     const void *text, size_t textlen, void *digest);

int gnutls_hash_init(gnutls_hash_hd_t * dig,
		     gnutls_digest_algorithm_t algorithm);
int gnutls_hash(gnutls_hash_hd_t handle, const void *text, size_t textlen);
void gnutls_hash_output(gnutls_hash_hd_t handle, void *digest);
void gnutls_hash_deinit(gnutls_hash_hd_t handle, void *digest);
int gnutls_hash_get_len(gnutls_digest_algorithm_t algorithm);
int gnutls_hash_fast(gnutls_digest_algorithm_t algorithm,
		     const void *text, size_t textlen, void *digest);

/* register ciphers */


/**
 * gnutls_rnd_level_t:
 * @GNUTLS_RND_NONCE: Non-predictable random number.  Fatal in parts
 *   of session if broken, i.e., vulnerable to statistical analysis.
 * @GNUTLS_RND_RANDOM: Pseudo-random cryptographic random number.
 *   Fatal in session if broken.
 * @GNUTLS_RND_KEY: Fatal in many sessions if broken.
 *
 * Enumeration of random quality levels.
 */
typedef enum gnutls_rnd_level {
	GNUTLS_RND_NONCE = 0,
	GNUTLS_RND_RANDOM = 1,
	GNUTLS_RND_KEY = 2
} gnutls_rnd_level_t;

int gnutls_rnd(gnutls_rnd_level_t level, void *data, size_t len);

void gnutls_rnd_refresh(void);

/* *INDENT-OFF* */
#ifdef __cplusplus
}
#endif
/* *INDENT-ON* */
#endif