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STM32 MBEDTLS: common STM32 API for ST CRYP IP
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‎features/mbedtls/targets/TARGET_STM/cryp_stm32.c

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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* Copyright (C) 2019-2020 STMicroelectronics, All Rights Reserved
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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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* This file implements ST shared CRYP services based on API from mbed TLS
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*/
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/* Includes ------------------------------------------------------------------*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if !(TARGET_STM32L4)
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#if defined(MBEDTLS_AES_ALT) || defined(MBEDTLS_CCM_ALT) || defined(MBEDTLS_GCM_ALT)
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#include "cryp_stm32.h"
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/* Variables -----------------------------------------------------------------*/
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/* Mutex protection because of one Crypt Hw instance is shared over several */
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/* mode of operations (AES, GCM, CCM implementations may be enabled together) */
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#if defined(MBEDTLS_THREADING_C)
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mbedtls_threading_mutex_t cryp_mutex;
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unsigned char cryp_mutex_started = 0;
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#endif /* MBEDTLS_THREADING_C */
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unsigned int cryp_context_count = 0;
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/* Functions -----------------------------------------------------------------*/
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/* Implementation that should never be optimized out by the compiler */
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void cryp_zeroize(void *v, size_t n)
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{
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volatile unsigned char *p = (unsigned char *)v;
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while (n--) {
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*p++ = 0;
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}
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}
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/* HAL function that should be implemented in the user file */
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/**
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* @brief CRYP MSP Initialization
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* This function configures the hardware resources used in this example:
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* - Peripherals clock enable
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* @param hcryp: CRYP handle pointer
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* @retval None
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*/
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void HAL_CRYP_MspInit(CRYP_HandleTypeDef *hcryp)
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{
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#if defined (AES)
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/* Enable CRYP clock */
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__HAL_RCC_AES_CLK_ENABLE();
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/* Force the CRYP Peripheral Clock Reset */
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__HAL_RCC_AES_FORCE_RESET();
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/* Release the CRYP Peripheral Clock Reset */
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__HAL_RCC_AES_RELEASE_RESET();
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#elif defined (AES1)
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/* Enable CRYP clock */
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__HAL_RCC_AES1_CLK_ENABLE();
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/* Force the CRYP Peripheral Clock Reset */
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__HAL_RCC_AES1_FORCE_RESET();
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/* Release the CRYP Peripheral Clock Reset */
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__HAL_RCC_AES1_RELEASE_RESET();
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#else /* CRYP */
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/* Enable CRYP clock */
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__HAL_RCC_CRYP_CLK_ENABLE();
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/* Force the CRYP Peripheral Clock Reset */
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__HAL_RCC_CRYP_FORCE_RESET();
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/* Release the CRYP Peripheral Clock Reset */
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__HAL_RCC_CRYP_RELEASE_RESET();
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#endif /* AES */
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}
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/**
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* @brief CRYP MSP De-Initialization
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* This function freeze the hardware resources used in this example:
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* - Disable the Peripherals clock
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* @param hcryp: CRYP handle pointer
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* @retval None
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*/
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void HAL_CRYP_MspDeInit(CRYP_HandleTypeDef *hcryp)
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{
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#if defined (AES)
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__HAL_RCC_AES_CLK_DISABLE();
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#elif defined (AES1)
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__HAL_RCC_AES1_CLK_DISABLE();
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#else /* CRYP */
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/* Disable CRYP clock */
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__HAL_RCC_CRYP_CLK_DISABLE();
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#endif /* AES */
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}
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#endif /* MBEDTLS_AES_ALT or MBEDTLS_CCM_ALT or MBEDTLS_GCM_ALT */
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#endif /* ! TARGET_STM32L4 */

‎features/mbedtls/targets/TARGET_STM/cryp_stm32.h

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/**
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******************************************************************************
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* @brief Header file of mbed TLS HW crypto (CRYP) implementation.
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******************************************************************************
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* @attention
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* Copyright (C) 2019-2020 STMicroelectronics, All Rights Reserved
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*
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* This software component is licensed by ST under Apache 2.0 license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* https://opensource.org/licenses/Apache-2.0
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*
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******************************************************************************
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*/
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/* Define to prevent recursive inclusion -------------------------------------*/
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#ifndef __CRYP_H
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#define __CRYP_H
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#if !(TARGET_STM32L4)
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#if defined(MBEDTLS_AES_ALT) || defined(MBEDTLS_CCM_ALT) || defined(MBEDTLS_GCM_ALT)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Includes ------------------------------------------------------------------*/
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#include "cmsis.h"
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#if defined(MBEDTLS_THREADING_C)
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#include "mbedtls/threading.h"
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#endif
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/* macros --------------------------------------------------------------------*/
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n,b,i) \
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do { \
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(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
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| ( (uint32_t) (b)[(i) + 1] << 16 ) \
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| ( (uint32_t) (b)[(i) + 2] << 8 ) \
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| ( (uint32_t) (b)[(i) + 3] ); \
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} while( 0 )
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n,b,i) \
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do { \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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} while( 0 )
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#endif
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/* constants -----------------------------------------------------------------*/
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#define ST_CRYP_TIMEOUT 1000 /* timeout (in ms) for the crypto processor */
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/* defines -------------------------------------------------------------------*/
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/* AES 192 bits key length may be optional in the HW */
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#if defined CRYP_KEYSIZE_192B
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#define USE_AES_KEY192 1
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#else
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#define USE_AES_KEY192 0
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#endif /* USE_AES_KEY192 */
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/* variables -----------------------------------------------------------------*/
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#if defined(MBEDTLS_THREADING_C)
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extern mbedtls_threading_mutex_t cryp_mutex;
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extern unsigned char cryp_mutex_started;
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#endif /* MBEDTLS_THREADING_C */
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extern unsigned int cryp_context_count;
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/* functions prototypes ------------------------------------------------------*/
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extern void cryp_zeroize(void *v, size_t n);
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_AES_ALT or MBEDTLS_CCM_ALT or MBEDTLS_GCM_ALT */
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#endif /* ! TARGET_STM32L4 */
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#endif /*__CRYP_H */

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