text: /**
   * \file md5.h
   *
   * \brief MD5 message digest algorithm (hash function)
   *
   * \warning   MD5 is considered a weak message digest and its use constitutes a
   *            security risk. We recommend considering stronger message
   *            digests instead.
   */
  /*
   *  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 STMicroelectronics MD5 API with HW services based
   *  on mbed TLS API
   */
  
  #ifndef MBEDTLS_MD5_ALT_H
  #define MBEDTLS_MD5_ALT_H
  
  #if defined (MBEDTLS_MD5_ALT)
  /* Includes ------------------------------------------------------------------*/
  #include "hash_stm32.h"
  
  #ifndef MBEDTLS_ERR_MD5_BAD_INPUT_DATA
  #define MBEDTLS_ERR_MD5_BAD_INPUT_DATA                     -0x00AF
  #endif
  
  #define ST_MD5_BLOCK_SIZE  ((size_t)  64)           /*!< HW handles 512 bits, ie 64 bytes */
  #define ST_MD5_NB_HASH_REG ((uint32_t)57)           /*!< Number of HASH HW context Registers:
                                                           CR + STR + IMR + CSR[54] */
  
  /**
   * \brief          MD5 context structure
   *
   * STMicroelectronics edition
   */
  typedef struct mbedtls_md5_context {
      HASH_HandleTypeDef hhash;                       /*!< Handle of HASH HAL */
      uint8_t sbuf[ST_MD5_BLOCK_SIZE];                /*!< Buffer to store input data until ST_MD5_BLOCK_SIZE
                                                           is reached, or until last input data is reached */
      uint8_t sbuf_len;                               /*!< Number of bytes stored in sbuf */
      uint32_t ctx_save_regs[ST_MD5_NB_HASH_REG];
  }
  mbedtls_md5_context;
  
  
  #endif /* MBEDTLS_MD5_ALT */
  
  #endif /* MBEDTLS_MD5_ALT_H */
  