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 #include "attributes.h"
27 #include "version.h"
28 
29 /**
30  * @defgroup lavu_sha SHA
31  * @ingroup lavu_crypto
32  * @{
33  */
34 
35 extern const int av_sha_size;
36 
37 struct AVSHA;
38 
39 /**
40  * Allocate an AVSHA context.
41  */
42 struct AVSHA *av_sha_alloc(void);
43 
44 /**
45  * Initialize SHA-1 or SHA-2 hashing.
46  *
47  * @param context pointer to the function context (of size av_sha_size)
48  * @param bits    number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
49  * @return        zero if initialization succeeded, -1 otherwise
50  */
51 int av_sha_init(struct AVSHA* context, int bits);
52 
53 /**
54  * Update hash value.
55  *
56  * @param context hash function context
57  * @param data    input data to update hash with
58  * @param len     input data length
59  */
60 void av_sha_update(struct AVSHA* context, const uint8_t* data, unsigned int len);
61 
62 /**
63  * Finish hashing and output digest value.
64  *
65  * @param context hash function context
66  * @param digest  buffer where output digest value is stored
67  */
68 void av_sha_final(struct AVSHA* context, uint8_t *digest);
69 
70 /**
71  * @}
72  */
73 
74 #endif /* AVUTIL_SHA_H */
75