AMiRo-OS

/**

  ******************************************************************************

  * @file    stm32f4xx_hash_md5.c

  * @author  MCD Application Team

  * @version V1.1.0

  * @date    11-January-2013

  * @brief   This file provides high level functions to compute the HASH MD5 and

  *          HMAC MD5 Digest of an input message.

  *          It uses the stm32f4xx_hash.c/.h drivers to access the STM32F4xx HASH

  *          peripheral.

  *

@verbatim

 ===================================================================

                  ##### How to use this driver #####

 ===================================================================

 [..]

   (#) Enable The HASH controller clock using 

       RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_HASH, ENABLE); function.

   (#) Calculate the HASH MD5 Digest using HASH_MD5() function.

   (#) Calculate the HMAC MD5 Digest using HMAC_MD5() function.

@endverbatim

  *

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>

  *

  * Licensed under MCD-ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2

  *

  * 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.

  *

  ******************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include "stm32f4xx_hash.h"

/** @addtogroup STM32F4xx_StdPeriph_Driver

  * @{

  */

/** @defgroup HASH 

  * @brief HASH driver modules

  * @{

  */

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

#define MD5BUSY_TIMEOUT    ((uint32_t) 0x00010000)

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/** @defgroup HASH_Private_Functions

  * @{

  */ 

/** @defgroup HASH_Group7 High Level MD5 functions

 *  @brief   High Level MD5 Hash and HMAC functions 

 *

@verbatim   

 ===============================================================================

              ##### High Level MD5 Hash and HMAC functions #####

 ===============================================================================

@endverbatim

  * @{

  */

/**

  * @brief  Compute the HASH MD5 digest.

  * @param  Input: pointer to the Input buffer to be treated.

  * @param  Ilen: length of the Input buffer.

  * @param  Output: the returned digest

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: digest computation done

  *          - ERROR: digest computation failed

  */

ErrorStatus HASH_MD5(uint8_t *Input, uint32_t Ilen, uint8_t Output[16])

{

  HASH_InitTypeDef MD5_HASH_InitStructure;

  HASH_MsgDigest MD5_MessageDigest;

  __IO uint16_t nbvalidbitsdata = 0;

  uint32_t i = 0;

  __IO uint32_t counter = 0;

  uint32_t busystatus = 0;

  ErrorStatus status = SUCCESS;

  uint32_t inputaddr  = (uint32_t)Input;

  uint32_t outputaddr = (uint32_t)Output;

  /* Number of valid bits in last word of the Input data */

  nbvalidbitsdata = 8 * (Ilen % 4);

  /* HASH peripheral initialization */

  HASH_DeInit();

  /* HASH Configuration */

  MD5_HASH_InitStructure.HASH_AlgoSelection = HASH_AlgoSelection_MD5;

  MD5_HASH_InitStructure.HASH_AlgoMode = HASH_AlgoMode_HASH;

  MD5_HASH_InitStructure.HASH_DataType = HASH_DataType_8b;

  HASH_Init(&MD5_HASH_InitStructure);

  /* Configure the number of valid bits in last word of the data */

  HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);

  /* Write the Input block in the IN FIFO */

  for(i=0; i<Ilen; i+=4)

  {

    HASH_DataIn(*(uint32_t*)inputaddr);

    inputaddr+=4;

  }

  /* Start the HASH processor */

  HASH_StartDigest();

  /* wait until the Busy flag is RESET */

  do

  {

    busystatus = HASH_GetFlagStatus(HASH_FLAG_BUSY);

    counter++;

  }while ((counter != MD5BUSY_TIMEOUT) && (busystatus != RESET));

  if (busystatus != RESET)

  {

     status = ERROR;

  }

  else

  {

    /* Read the message digest */

    HASH_GetDigest(&MD5_MessageDigest);

    *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[0]);

    outputaddr+=4;

    *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[1]);

    outputaddr+=4;

    *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[2]);

    outputaddr+=4;

    *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[3]);

  }

  return status; 

}

/**

  * @brief  Compute the HMAC MD5 digest.

  * @param  Key: pointer to the Key used for HMAC.

  * @param  Keylen: length of the Key used for HMAC.

  * @param  Input: pointer to the Input buffer to be treated.

  * @param  Ilen: length of the Input buffer.

  * @param  Output: the returned digest  

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: digest computation done

  *          - ERROR: digest computation failed

  */

ErrorStatus HMAC_MD5(uint8_t *Key, uint32_t Keylen, uint8_t *Input, 

                     uint32_t Ilen, uint8_t Output[16])

{

  HASH_InitTypeDef MD5_HASH_InitStructure;

  HASH_MsgDigest MD5_MessageDigest;

  __IO uint16_t nbvalidbitsdata = 0;

  __IO uint16_t nbvalidbitskey = 0;

  uint32_t i = 0;

  __IO uint32_t counter = 0;

  uint32_t busystatus = 0;

  ErrorStatus status = SUCCESS;

  uint32_t keyaddr    = (uint32_t)Key;

  uint32_t inputaddr  = (uint32_t)Input;

  uint32_t outputaddr = (uint32_t)Output;

  /* Number of valid bits in last word of the Input data */

  nbvalidbitsdata = 8 * (Ilen % 4);

  /* Number of valid bits in last word of the Key */

  nbvalidbitskey = 8 * (Keylen % 4);

  /* HASH peripheral initialization */

  HASH_DeInit();

  /* HASH Configuration */

  MD5_HASH_InitStructure.HASH_AlgoSelection = HASH_AlgoSelection_MD5;

  MD5_HASH_InitStructure.HASH_AlgoMode = HASH_AlgoMode_HMAC;

  MD5_HASH_InitStructure.HASH_DataType = HASH_DataType_8b;

  if(Keylen > 64)

  {

    /* HMAC long Key */

    MD5_HASH_InitStructure.HASH_HMACKeyType = HASH_HMACKeyType_LongKey;

  }

  else

  {

    /* HMAC short Key */

    MD5_HASH_InitStructure.HASH_HMACKeyType = HASH_HMACKeyType_ShortKey;

  }

  HASH_Init(&MD5_HASH_InitStructure);

  /* Configure the number of valid bits in last word of the Key */

  HASH_SetLastWordValidBitsNbr(nbvalidbitskey);

  /* Write the Key */

  for(i=0; i<Keylen; i+=4)

  {

    HASH_DataIn(*(uint32_t*)keyaddr);

    keyaddr+=4;

  }

  /* Start the HASH processor */

  HASH_StartDigest();

  /* wait until the Busy flag is RESET */

  do

  {

    busystatus = HASH_GetFlagStatus(HASH_FLAG_BUSY);

    counter++;

  }while ((counter != MD5BUSY_TIMEOUT) && (busystatus != RESET));

  if (busystatus != RESET)

  {

     status = ERROR;

  }

  else

  {

    /* Configure the number of valid bits in last word of the Input data */

    HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);

    /* Write the Input block in the IN FIFO */

    for(i=0; i<Ilen; i+=4)

    {

      HASH_DataIn(*(uint32_t*)inputaddr);

      inputaddr+=4;

    }

    /* Start the HASH processor */

    HASH_StartDigest();

    /* wait until the Busy flag is RESET */

    counter =0;

    do

    {

       busystatus = HASH_GetFlagStatus(HASH_FLAG_BUSY);

       counter++;

    }while ((counter != MD5BUSY_TIMEOUT) && (busystatus != RESET));

    if (busystatus != RESET)

    {

      status = ERROR;

    }

    else

    {  

      /* Configure the number of valid bits in last word of the Key */

      HASH_SetLastWordValidBitsNbr(nbvalidbitskey);

      /* Write the Key */

      keyaddr = (uint32_t)Key;

      for(i=0; i<Keylen; i+=4)

      {

        HASH_DataIn(*(uint32_t*)keyaddr);

        keyaddr+=4;

      }

       /* Start the HASH processor */

       HASH_StartDigest();

       /* wait until the Busy flag is RESET */

       counter =0;

       do

       {

          busystatus = HASH_GetFlagStatus(HASH_FLAG_BUSY);

          counter++;

      }while ((counter != MD5BUSY_TIMEOUT) && (busystatus != RESET));

      if (busystatus != RESET)

      {

         status = ERROR;

      }

      else

      {

         /* Read the message digest */

         HASH_GetDigest(&MD5_MessageDigest);

         *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[0]);

         outputaddr+=4;

         *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[1]);

         outputaddr+=4;

         *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[2]);

         outputaddr+=4;

         *(uint32_t*)(outputaddr)  = __REV(MD5_MessageDigest.Data[3]);

      }

    }

  }

  return status;  

}

/**

  * @}

  */ 

/**

  * @}

  */ 

/**

  * @}

  */ 

/**

  * @}

  */ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/