/*

 * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef AVUTIL_SHA_H

#define AVUTIL_SHA_H

#include <stdint.h>

#include "attributes.h"

#include "version.h"

/**

 * @defgroup lavu_sha SHA

 * @ingroup lavu_crypto

 * @{

 */

#if FF_API_CONTEXT_SIZE

extern attribute_deprecated const int av_sha_size;

#endif

struct AVSHA;

/**

 * Allocate an AVSHA context.

 */

struct AVSHA *av_sha_alloc(void);

/**

 * Initialize SHA-1 or SHA-2 hashing.

 *

 * @param context pointer to the function context (of size av_sha_size)

 * @param bits    number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)

 * @return        zero if initialization succeeded, -1 otherwise

 */

int av_sha_init(struct AVSHA* context, int bits);

/**

 * Update hash value.

 *

 * @param context hash function context

 * @param data    input data to update hash with

 * @param len     input data length

 */

void av_sha_update(struct AVSHA* context, const uint8_t* data, unsigned int len);

/**

 * Finish hashing and output digest value.

 *

 * @param context hash function context

 * @param digest  buffer where output digest value is stored

 */

void av_sha_final(struct AVSHA* context, uint8_t *digest);

/**

 * @}

 */

#endif /* AVUTIL_SHA_H */