text: /*
   *  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 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;
      }
  }
  
  #endif /* MBEDTLS_AES_ALT or MBEDTLS_CCM_ALT or MBEDTLS_GCM_ALT */
  