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109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*-
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* Copyright 2005 Colin Percival
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* Copyright 2013 Christian Mehlis & René Kijewski
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/lib/libmd/sha256.h,v 1.1.2.1 2005/06/24 13:32:25 cperciva Exp $
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*/
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/**
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* @ingroup sys_hashes
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* @{
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*
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* @file
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* @brief Header definitions for the SHA256 hash function
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*
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* @author Colin Percival
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* @author Christian Mehlis
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* @author Rene Kijewski
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*/
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#ifndef _SHA256_H_
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#define _SHA256_H_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SHA256_DIGEST_LENGTH 32
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/**
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* @brief Context for ciper operatins based on sha256
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*/
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typedef struct {
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/** global state */
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uint32_t state[8];
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/** processed bytes counter */
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uint32_t count[2];
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/** data buffer */
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unsigned char buf[64];
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} sha256_context_t;
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/**
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* @brief SHA-256 initialization. Begins a SHA-256 operation.
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*
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* @param ctx sha256_context_t handle to init
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*/
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void sha256_init(sha256_context_t *ctx);
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/**
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* @brief Add bytes into the hash
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*
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* @param ctx sha256_context_t handle to use
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* @param in pointer to the input buffer
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* @param len length of the buffer
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*/
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void sha256_update(sha256_context_t *ctx, const void *in, size_t len);
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/**
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* @brief SHA-256 finalization. Pads the input data, exports the hash value,
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* and clears the context state.
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*
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* @param digest resulting digest, this is the hash of all the bytes
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* @param ctx sha256_context_t handle to use
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*/
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void sha256_final(unsigned char digest[32], sha256_context_t *ctx);
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/**
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* @brief A wrapper function to simplify the generation of a hash, this is
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* usefull for generating sha256 for one buffer
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*
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* @param d pointer to the buffer to generate hash from
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* @param n length of the buffer
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* @param md optional pointer to an array for the result, length must be
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* SHA256_DIGEST_LENGTH
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* if md == NULL, one static buffer is used
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*/
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unsigned char *sha256(const unsigned char *d, size_t n, unsigned char *md);
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* _SHA256_H_ */
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