/* gosthash94.h

   The GOST R 34.11-94 hash function, described in RFC 5831.

   Copyright (C) 2012 Nikos Mavrogiannopoulos, Niels Möller

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

     * 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.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.

   GNU Nettle 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
   General Public License for more details.

   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/

/* Based on rhash gost.h. */

/* Copyright: 2009-2012 Aleksey Kravchenko <rhash.admin@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * Ported to nettle by Nikos Mavrogiannopoulos.
 */

#ifndef NETTLE_GOSTHASH94_H_INCLUDED
#define NETTLE_GOSTHASH94_H_INCLUDED

#include "nettle-types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define gosthash94_init nettle_gosthash94_init
#define gosthash94_update nettle_gosthash94_update
#define gosthash94_digest nettle_gosthash94_digest

#define GOSTHASH94_BLOCK_SIZE 32
#define GOSTHASH94_DIGEST_SIZE 32
/* For backwards compatibility */
#define GOSTHASH94_DATA_SIZE GOSTHASH94_BLOCK_SIZE

struct gosthash94_ctx
{
  uint32_t hash[8]; /* algorithm 256-bit state */
  uint32_t sum[8];  /* sum of processed message blocks */
  uint8_t message[GOSTHASH94_BLOCK_SIZE]; /* 256-bit buffer for leftovers */
  uint64_t length;  /* number of processed bytes */
};

void gosthash94_init(struct gosthash94_ctx *ctx);
void gosthash94_update(struct gosthash94_ctx *ctx,
		       size_t length, const uint8_t *msg);
void gosthash94_digest(struct gosthash94_ctx *ctx,
		       size_t length, uint8_t *result);

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_GOSTHASH94_H_INCLUDED */
