/*
 * 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 3 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

#ifdef __cplusplus
extern "C"
{
#endif

  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);


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

  int gnutls_hmac_init (gnutls_hmac_hd_t * dig,
                        gnutls_mac_algorithm_t algorithm, const void *key,
                        size_t keylen);
  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);

#ifdef __cplusplus
}
#endif

#endif
