STM32 MBEDTLS: common STM32 API for ST CRYP IP

features/mbedtls/targets/TARGET_STM/cryp_stm32.c

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

features/mbedtls/targets/TARGET_STM/cryp_stm32.h

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