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/**
* \file sha256.h
*
* \brief SHA-224 and SHA-256 cryptographic hash function
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: GPL-2.0
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_SHA256_H
#define MBEDTLS_SHA256_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if !defined(MBEDTLS_SHA256_ALT)
// Regular implementation
//
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief SHA-256 context structure
*/
typedef struct
{
uint32_t total[2]; /*!< number of bytes processed */
uint32_t state[8]; /*!< intermediate digest state */
unsigned char buffer[64]; /*!< data block being processed */
int is224; /*!< 0 => SHA-256, else SHA-224 */
}
mbedtls_sha256_context;
/**
* \brief Initialize SHA-256 context
*
* \param ctx SHA-256 context to be initialized
*/
void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
/**
* \brief Clear SHA-256 context
*
* \param ctx SHA-256 context to be cleared
*/
void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
/**
* \brief Clone (the state of) a SHA-256 context
*
* \param dst The destination context
* \param src The context to be cloned
*/
void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
const mbedtls_sha256_context *src );
/**
* \brief SHA-256 context setup
*
* \param ctx context to be initialized
* \param is224 0 = use SHA256, 1 = use SHA224
*/
void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 );
/**
* \brief SHA-256 process buffer
*
* \param ctx SHA-256 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
size_t ilen );
/**
* \brief SHA-256 final digest
*
* \param ctx SHA-256 context
* \param output SHA-224/256 checksum result
*/
void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] );
/* Internal use */
void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] );
#ifdef __cplusplus
}
#endif
#else /* MBEDTLS_SHA256_ALT */
#include "sha256_alt.h"
#endif /* MBEDTLS_SHA256_ALT */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Output = SHA-256( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-224/256 checksum result
* \param is224 0 = use SHA256, 1 = use SHA224
*/
void mbedtls_sha256( const unsigned char *input, size_t ilen,
unsigned char output[32], int is224 );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_sha256_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* mbedtls_sha256.h */
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