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sha.h
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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 /**
22  * @file
23  * @ingroup lavu_sha
24  * Public header for SHA-1 & SHA-256 hash function implementations.
25  */
26 
27 #ifndef AVUTIL_SHA_H
28 #define AVUTIL_SHA_H
29 
30 #include <stddef.h>
31 #include <stdint.h>
32 
33 #include "attributes.h"
34 #include "version.h"
35 
36 /**
37  * @defgroup lavu_sha SHA
38  * @ingroup lavu_hash
39  * SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations.
40  *
41  * This module supports the following SHA hash functions:
42  *
43  * - SHA-1: 160 bits
44  * - SHA-224: 224 bits, as a variant of SHA-2
45  * - SHA-256: 256 bits, as a variant of SHA-2
46  *
47  * @see For SHA-384, SHA-512, and variants thereof, see @ref lavu_sha512.
48  *
49  * @{
50  */
51 
52 extern const int av_sha_size;
53 
54 struct AVSHA;
55 
56 /**
57  * Allocate an AVSHA context.
58  */
59 struct AVSHA *av_sha_alloc(void);
60 
61 /**
62  * Initialize SHA-1 or SHA-2 hashing.
63  *
64  * @param context pointer to the function context (of size av_sha_size)
65  * @param bits number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
66  * @return zero if initialization succeeded, -1 otherwise
67  */
68 int av_sha_init(struct AVSHA* context, int bits);
69 
70 /**
71  * Update hash value.
72  *
73  * @param ctx hash function context
74  * @param data input data to update hash with
75  * @param len input data length
76  */
77 #if FF_API_CRYPTO_SIZE_T
78 void av_sha_update(struct AVSHA *ctx, const uint8_t *data, unsigned int len);
79 #else
80 void av_sha_update(struct AVSHA *ctx, const uint8_t *data, size_t len);
81 #endif
82 
83 /**
84  * Finish hashing and output digest value.
85  *
86  * @param context hash function context
87  * @param digest buffer where output digest value is stored
88  */
89 void av_sha_final(struct AVSHA* context, uint8_t *digest);
90 
91 /**
92  * @}
93  */
94 
95 #endif /* AVUTIL_SHA_H */
void av_sha_final(struct AVSHA *context, uint8_t *digest)
Finish hashing and output digest value.
Definition: sha.c:345
hash context
Definition: sha.c:34
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int av_sha_init(struct AVSHA *context, int bits)
Initialize SHA-1 or SHA-2 hashing.
Definition: sha.c:273
Macro definitions for various function/variable attributes.
uint8_t
Libavutil version macros.
void av_sha_update(struct AVSHA *ctx, const uint8_t *data, unsigned int len)
Update hash value.
Definition: sha.c:315
AVFormatContext * ctx
Definition: movenc.c:48
struct AVSHA * av_sha_alloc(void)
Allocate an AVSHA context.
Definition: sha.c:45
const int av_sha_size
Definition: sha.c:43
int len