96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
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/*
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* Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @ingroup lavu_sha
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* Public header for SHA-1 & SHA-256 hash function implementations.
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*/
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#ifndef AVUTIL_SHA_H
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#define AVUTIL_SHA_H
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#include <stddef.h>
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#include <stdint.h>
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#include "attributes.h"
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#include "version.h"
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/**
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* @defgroup lavu_sha SHA
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* @ingroup lavu_hash
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* SHA-1 and SHA-256 (Secure Hash Algorithm) hash function implementations.
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*
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* This module supports the following SHA hash functions:
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*
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* - SHA-1: 160 bits
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* - SHA-224: 224 bits, as a variant of SHA-2
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* - SHA-256: 256 bits, as a variant of SHA-2
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*
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* @see For SHA-384, SHA-512, and variants thereof, see @ref lavu_sha512.
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*
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* @{
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*/
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extern const int av_sha_size;
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struct AVSHA;
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/**
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* Allocate an AVSHA context.
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*/
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struct AVSHA *av_sha_alloc(void);
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/**
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* Initialize SHA-1 or SHA-2 hashing.
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*
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* @param context pointer to the function context (of size av_sha_size)
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* @param bits number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
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* @return zero if initialization succeeded, -1 otherwise
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*/
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int av_sha_init(struct AVSHA* context, int bits);
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/**
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* Update hash value.
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*
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* @param ctx hash function context
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* @param data input data to update hash with
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* @param len input data length
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*/
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#if FF_API_CRYPTO_SIZE_T
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void av_sha_update(struct AVSHA *ctx, const uint8_t *data, unsigned int len);
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#else
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void av_sha_update(struct AVSHA *ctx, const uint8_t *data, size_t len);
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#endif
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/**
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* Finish hashing and output digest value.
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*
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* @param context hash function context
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* @param digest buffer where output digest value is stored
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*/
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void av_sha_final(struct AVSHA* context, uint8_t *digest);
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/**
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* @}
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*/
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#endif /* AVUTIL_SHA_H */
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