1 /*

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

     3  *

     4  * This file is part of Libav.

     5  *

     6  * Libav is free software; you can redistribute it and/or

     7  * modify it under the terms of the GNU Lesser General Public

     8  * License as published by the Free Software Foundation; either

     9  * version 2.1 of the License, or (at your option) any later version.

    10  *

    11  * Libav is distributed in the hope that it will be useful,

    12  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  * Lesser General Public License for more details.

    15  *

    16  * You should have received a copy of the GNU Lesser General Public

    17  * License along with Libav; if not, write to the Free Software

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

    19  */

    20 

    21 #ifndef AVUTIL_SHA_H

    22 #define AVUTIL_SHA_H

    23 

    24 #include <stdint.h>

    25 

    26 #include "attributes.h"

    27 #include "version.h"

    28 

    29 /**

    30  * @defgroup lavu_sha SHA

    31  * @ingroup lavu_crypto

    32  * @{

    33  */

    34 

    35 #if FF_API_CONTEXT_SIZE

    36 extern attribute_deprecated const int av_sha_size;

    37 #endif

    38 

    39 struct AVSHA;

    40 

    41 /**

    42  * Allocate an AVSHA context.

    43  */

    44 struct AVSHA *av_sha_alloc(void);

    45 

    46 /**

    47  * Initialize SHA-1 or SHA-2 hashing.

    48  *

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

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

    51  * @return        zero if initialization succeeded, -1 otherwise

    52  */

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

    54 

    55 /**

    56  * Update hash value.

    57  *

    58  * @param context hash function context

    59  * @param data    input data to update hash with

    60  * @param len     input data length

    61  */

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

    63 

    64 /**

    65  * Finish hashing and output digest value.

    66  *

    67  * @param context hash function context

    68  * @param digest  buffer where output digest value is stored

    69  */

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

    71 

    72 /**

    73  * @}

    74  */

    75 

    76 #endif /* AVUTIL_SHA_H */