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/*
* Copyright (c) 2016-2022 Bouffalolab.
*
* This file is part of
* *** Bouffalolab Software Dev Kit ***
* (see www.bouffalolab.com).
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Bouffalo Lab nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _IOTX_COMMON_SHA256_H_
#define _IOTX_COMMON_SHA256_H_
#include <stdint.h>
#define SHA256_DIGEST_LENGTH (32)
#define SHA256_BLOCK_LENGTH (64)
#define SHA256_SHORT_BLOCK_LENGTH (SHA256_BLOCK_LENGTH - 8)
#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
/**
* \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 */
} iot_sha256_context;
typedef union {
char sptr[8];
uint64_t lint;
} u_retLen;
/**
* \brief Initialize SHA-256 context
*
* \param ctx SHA-256 context to be initialized
*/
void utils_sha256_init(iot_sha256_context *ctx);
/**
* \brief Clear SHA-256 context
*
* \param ctx SHA-256 context to be cleared
*/
void utils_sha256_free(iot_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 utils_sha256_clone(iot_sha256_context *dst,
const iot_sha256_context *src);
/**
* \brief SHA-256 context setup
*
* \param ctx context to be initialized
*/
void utils_sha256_starts(iot_sha256_context *ctx);
/**
* \brief SHA-256 process buffer
*
* \param ctx SHA-256 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void utils_sha256_update(iot_sha256_context *ctx, const unsigned char *input, uint32_t ilen);
/**
* \brief SHA-256 final digest
*
* \param ctx SHA-256 context
* \param output SHA-256 checksum result
*/
void utils_sha256_finish(iot_sha256_context *ctx, uint8_t output[32]);
/* Internal use */
void utils_sha256_process(iot_sha256_context *ctx, const unsigned char data[64]);
/**
* \brief Output = SHA-256( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-256 checksum result
*/
void utils_sha256(const uint8_t *input, uint32_t ilen, uint8_t output[32]);
#endif
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