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
26extern const int av_sha_size;
27
28struct 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 */
37int 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 */
46void 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 */
54void av_sha_final(struct AVSHA* context, uint8_t *digest);
55
56#endif /* AVUTIL_SHA_H */
57