libavutil/sha.h

   1 /*
   2  * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 extern const int av_sha_size;
  27
  28 struct AVSHA;
  29
  30 /**
  31  * Initializes SHA-1 or SHA-2 hashing.
  32  *
  33  * @param context pointer to the function context (of size av_sha_size)
  34  * @param bits    number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
  35  * @return        zero if initialization succeeded, -1 otherwise
  36  */
  37 int av_sha_init(struct AVSHA* context, int bits);
  38
  39 /**
  40  * Updates hash value.
  41  *
  42  * @param context hash function context
  43  * @param data    input data to update hash with
  44  * @param len     input data length
  45  */
  46 void av_sha_update(struct AVSHA* context, const uint8_t* data, unsigned int len);
  47
  48 /**
  49  * Finishes hashing and output digest value.
  50  *
  51  * @param context hash function context
  52  * @param digest  buffer where output digest value is stored
  53  */
  54 void av_sha_final(struct AVSHA* context, uint8_t *digest);
  55
  56 #endif /* AVUTIL_SHA_H */