2 * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
24 * Public header for SHA-1 & SHA-256 hash function implementations.
32 #include "attributes.h"
36 * @defgroup lavu_sha SHA
38 * SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations.
40 * This module supports the following SHA hash functions:
43 * - SHA-224: 224 bits, as a variant of SHA-2
44 * - SHA-256: 256 bits, as a variant of SHA-2
46 * @see For SHA-384, SHA-512, and variants thereof, see @ref lavu_sha512.
51 extern const int av_sha_size;
56 * Allocate an AVSHA context.
58 struct AVSHA *av_sha_alloc(void);
61 * Initialize SHA-1 or SHA-2 hashing.
63 * @param context pointer to the function context (of size av_sha_size)
64 * @param bits number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
65 * @return zero if initialization succeeded, -1 otherwise
67 int av_sha_init(struct AVSHA* context, int bits);
72 * @param context hash function context
73 * @param data input data to update hash with
74 * @param len input data length
76 void av_sha_update(struct AVSHA* context, const uint8_t* data, unsigned int len);
79 * Finish hashing and output digest value.
81 * @param context hash function context
82 * @param digest buffer where output digest value is stored
84 void av_sha_final(struct AVSHA* context, uint8_t *digest);
90 #endif /* AVUTIL_SHA_H */