/*
 * \file sha1_alt.h
 *
 * \brief SHA1 hw acceleration (hash function)
 *
 *  Copyright (C) 2017, STMicroelectronics
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
#ifndef MBEDTLS_SHA1_ALT_H
#define MBEDTLS_SHA1_ALT_H

#if defined (MBEDTLS_SHA1_ALT)


#include "cmsis.h"
#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif

#define ST_SHA1_BLOCK_SIZE   ((size_t) 64) // HW handles 512 bits, ie 64 bytes
#define ST_SHA1_TIMEOUT      ((uint32_t) 3)
/**
 * \brief    SHA-1 context structure
 * \note     HAL_HASH_SHA1_Accumulate will accumulate 512 bits packets, unless it is the last call to the  function
 *           A ST_SHA1_BLOCK_SIZE bytes buffer is used to save values and handle the processing
 *           multiples of ST_SHA1_BLOCK_SIZE bytes
 *           If SHA1_finish is called and sbuf_len>0, the remaining bytes are accumulated prior to the call to HAL_HASH_SHA1_Finish
 */
typedef struct
{
    unsigned char sbuf[ST_SHA1_BLOCK_SIZE]; /*!< MBEDTLS_SHA1_BLOCK_SIZE buffer to store values so that algorithm is caled once the buffer is filled */
    unsigned char sbuf_len; /*!< number of bytes remaining in sbuf to be processed */
    HASH_HandleTypeDef hhash_sha1; /*!< ST HAL HASH struct */
    uint32_t ctx_save_cr;
    uint32_t ctx_save_str;
    uint32_t ctx_save_csr[38];
}
mbedtls_sha1_context;

/**
 * \brief          Initialize SHA-1 context
 *
 * \param ctx      SHA-1 context to be initialized
 */
void mbedtls_sha1_init( mbedtls_sha1_context *ctx );

/**
 * \brief          Clear SHA-1 context
 *
 * \param ctx      SHA-1 context to be cleared
 */
void mbedtls_sha1_free( mbedtls_sha1_context *ctx );

/**
 * \brief          Clone (the state of) a SHA-1 context
 *
 * \param dst      The destination context
 * \param src      The context to be cloned
 */
void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
                         const mbedtls_sha1_context *src );

/**
 * \brief          SHA-1 context setup
 *
 * \param ctx      context to be initialized
 */
void mbedtls_sha1_starts( mbedtls_sha1_context *ctx );

/**
 * \brief          SHA-1 process buffer
 *
 * \param ctx      SHA-1 context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
void mbedtls_sha1_update( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen );

/**
 * \brief          SHA-1 final digest
 *
 * \param ctx      SHA-1 context
 * \param output   SHA-1 checksum result
 */
void mbedtls_sha1_finish( mbedtls_sha1_context *ctx, unsigned char output[20] );

/* Internal use */
void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[ST_SHA1_BLOCK_SIZE] );

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_SHA1_ALT */

#endif /* sha1_alt.h */
