mirror of https://github.com/ARMmbed/mbed-os.git
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/**
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* \file sha256_alt.h
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*
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* \brief SHA256 hw acceleration (hash function)
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*
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* Copyright (c) 2017, STMicroelectronics
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef MBEDTLS_SHA256_ALT_H
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#define MBEDTLS_SHA256_ALT_H
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#if defined (MBEDTLS_SHA256_ALT)
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#include "cmsis.h"
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#include <string.h>
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/**
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* \name SECTION: Temporary compatibility code
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*
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* This section contains code to be added up stream in Mbed TLS. Once that
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* has been provided, this section should be removed as the code will be
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* provided elsewhere.
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* \{
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*/
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#define MBEDTLS_ERR_SHA256_HW_ACCEL_FAILED -0x0037 /**< SHA-256 hardware accelerator failed */
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/* \} name SECTION: Temporary compatibility code */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ST_SHA256_BLOCK_SIZE ((size_t) 64) // HW handles 512 bits, ie 64 bytes
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#define ST_SHA256_TIMEOUT ((uint32_t) 3)
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/**
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* \brief SHA-256 context structure
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* \note HAL_HASH_SHA256_Accumulate will accumulate 512 bits packets, unless it is the last call to the function
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* A ST_SHA256_BLOCK_SIZE bytes buffer is used to save values and handle the processing
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* ST_SHA256_BLOCK_SIZE bytes per ST_SHA256_BLOCK_SIZE bytes
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* If sha256_finish is called and sbuf_len>0, the remaining bytes are accumulated prior to the call to HAL_HASH_SHA256_Finish
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*/
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typedef struct
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{
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int is224; /*!< 0 => SHA-256, else SHA-224 */
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HASH_HandleTypeDef hhash_sha256;
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unsigned char sbuf[ST_SHA256_BLOCK_SIZE]; /*!< ST_SHA256_BLOCK_SIZE buffer to store values so that algorithm is called once the buffer is filled */
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unsigned char sbuf_len; /*!< number of bytes to be processed in sbuf */
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uint32_t ctx_save_cr;
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uint32_t ctx_save_str;
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uint32_t ctx_save_csr[38];
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}
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mbedtls_sha256_context;
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/**
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* \brief Initialize SHA-256 context
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*
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* \param ctx SHA-256 context to be initialized
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*/
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void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
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/**
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* \brief Clear SHA-256 context
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*
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* \param ctx SHA-256 context to be cleared
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*/
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void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
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/**
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* \brief Clone (the state of) a SHA-256 context
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*
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* \param dst The destination context
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* \param src The context to be cloned
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*/
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void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
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const mbedtls_sha256_context *src );
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/**
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* \brief SHA-256 context setup
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*
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* \param ctx context to be initialized
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* \param is224 0 = use SHA256, 1 = use SHA224
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*
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* \return 0 if successful
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*/
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int mbedtls_sha256_starts_ret( mbedtls_sha256_context *ctx, int is224 );
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/**
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* \brief SHA-256 process buffer
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*
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* \param ctx SHA-256 context
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* \param input buffer holding the data
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* \param ilen length of the input data
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*
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* \return 0 if successful
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*/
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int mbedtls_sha256_update_ret( mbedtls_sha256_context *ctx, const unsigned char *input,
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size_t ilen );
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/**
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* \brief SHA-256 final digest
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*
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* \param ctx SHA-256 context
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* \param output SHA-224/256 checksum result
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*
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* \return 0 if successful
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*/
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int mbedtls_sha256_finish_ret( mbedtls_sha256_context *ctx, unsigned char output[32] );
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/* Internal use */
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int mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[ST_SHA256_BLOCK_SIZE] );
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_SHA256_ALT */
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#endif /* sha256_alt.h */
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