text: /**
   * \file
   * \brief CryptoAuthLib Basic API methods for CheckMAC command.
   *
   * The CheckMac command calculates a MAC response that would have been
   * generated on a different CryptoAuthentication device and then compares the
   * result with input value.
   *
   * \note List of devices that support this command - ATSHA204A, ATECC108A,
   *       ATECC508A, and ATECC608A. There are differences in the modes that they
   *       support. Refer to device datasheets for full details.
   *
   * \copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
   *
   * \page License
   * 
   * Subject to your compliance with these terms, you may use Microchip software
   * and any derivatives exclusively with Microchip products. It is your
   * responsibility to comply with third party license terms applicable to your
   * use of third party software (including open source software) that may
   * accompany Microchip software.
   * 
   * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
   * EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
   * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
   * PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT,
   * SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE
   * OF ANY KIND WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF
   * MICROCHIP HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE
   * FORESEEABLE. TO THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL
   * LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED
   * THE AMOUNT OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR
   * THIS SOFTWARE.
   */
  
  #include "atca_basic.h"
  #include "../atca_execution.h"
  
  /** \brief Compares a MAC response with input values
   *	\param[in] mode        Controls which fields within the device are used in
   *                         the message
   *	\param[in] key_id      Key location in the CryptoAuth device to use for the
   *                         MAC
   *	\param[in] challenge   Challenge data (32 bytes)
   *	\param[in] response    MAC response data (32 bytes)
   *	\param[in] other_data  OtherData parameter (13 bytes)
   *  \return ATCA_SUCCESS on success, otherwise an error code.
   */
  ATCA_STATUS atcab_checkmac(uint8_t mode, uint16_t key_id, const uint8_t* challenge, const uint8_t* response, const uint8_t* other_data)
  {
      ATCAPacket  packet;
      ATCACommand ca_cmd = _gDevice->mCommands;
      ATCA_STATUS status = ATCA_GEN_FAIL;
  
      // Verify the inputs
      if (response == NULL || other_data == NULL)
      {
          return ATCA_BAD_PARAM;
      }
      if (!(mode & CHECKMAC_MODE_BLOCK2_TEMPKEY) && challenge == NULL)
      {
          return ATCA_BAD_PARAM;
      }
  
      do
      {
          // build Check MAC command
          packet.param1 = mode;
          packet.param2 = key_id;
          if (challenge != NULL)
          {
              memcpy(&packet.data[0], challenge, CHECKMAC_CLIENT_CHALLENGE_SIZE);
          }
          else
          {
              memset(&packet.data[0], 0, CHECKMAC_CLIENT_CHALLENGE_SIZE);
          }
          memcpy(&packet.data[32], response, CHECKMAC_CLIENT_RESPONSE_SIZE);
          memcpy(&packet.data[64], other_data, CHECKMAC_OTHER_DATA_SIZE);
  
          if ((status = atCheckMAC(ca_cmd, &packet)) != ATCA_SUCCESS)
          {
              break;
          }
  
          if ((status = atca_execute_command((void*)&packet, _gDevice)) != ATCA_SUCCESS)
          {
              break;
          }
      } while (0);
  
      return status;
  }
  