/**
  ******************************************************************************
  * @file    stm32f7xx_hal_hash_ex.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    12-May-2015
  * @brief   HASH HAL Extension module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of HASH peripheral:
  *           + Extended HASH processing functions based on SHA224 Algorithm
  *           + Extended HASH processing functions based on SHA256 Algorithm
  *         
  @verbatim
  ==============================================================================
                     ##### How to use this driver #####
  ==============================================================================
    [..]
    The HASH HAL driver can be used as follows:
    (#)Initialize the HASH low level resources by implementing the HAL_HASH_MspInit():
        (##) Enable the HASH interface clock using __HAL_RCC_HASH_CLK_ENABLE()
        (##) In case of using processing APIs based on interrupts (e.g. HAL_HMACEx_SHA224_Start())
            (+++) Configure the HASH interrupt priority using HAL_NVIC_SetPriority()
            (+++) Enable the HASH IRQ handler using HAL_NVIC_EnableIRQ()
            (+++) In HASH IRQ handler, call HAL_HASH_IRQHandler()
        (##) In case of using DMA to control data transfer (e.g. HAL_HMACEx_SH224_Start_DMA())
            (+++) Enable the DMAx interface clock using __DMAx_CLK_ENABLE()
            (+++) Configure and enable one DMA stream one for managing data transfer from
                memory to peripheral (input stream). Managing data transfer from
                peripheral to memory can be performed only using CPU
            (+++) Associate the initialized DMA handle to the HASH DMA handle
                using  __HAL_LINKDMA()
            (+++) Configure the priority and enable the NVIC for the transfer complete
                interrupt on the DMA Stream: HAL_NVIC_SetPriority() and HAL_NVIC_EnableIRQ()
    (#)Initialize the HASH HAL using HAL_HASH_Init(). This function configures mainly:
        (##) The data type: 1-bit, 8-bit, 16-bit and 32-bit.
        (##) For HMAC, the encryption key.
        (##) For HMAC, the key size used for encryption.
    (#)Three processing functions are available:
        (##) Polling mode: processing APIs are blocking functions
             i.e. they process the data and wait till the digest computation is finished
             e.g. HAL_HASHEx_SHA224_Start()
        (##) Interrupt mode: encryption and decryption APIs are not blocking functions
                i.e. they process the data under interrupt
                e.g. HAL_HASHEx_SHA224_Start_IT()
        (##) DMA mode: processing APIs are not blocking functions and the CPU is
             not used for data transfer i.e. the data transfer is ensured by DMA
                e.g. HAL_HASHEx_SHA224_Start_DMA()
    (#)When the processing function is called at first time after HAL_HASH_Init()
       the HASH peripheral is initialized and processes the buffer in input.
       After that, the digest computation is started.
       When processing multi-buffer use the accumulate function to write the
       data in the peripheral without starting the digest computation. In last 
       buffer use the start function to input the last buffer ans start the digest
       computation.
       (##) e.g. HAL_HASHEx_SHA224_Accumulate() : write 1st data buffer in the peripheral without starting the digest computation
       (##)  write (n-1)th data buffer in the peripheral without starting the digest computation
       (##)  HAL_HASHEx_SHA224_Start() : write (n)th data buffer in the peripheral and start the digest computation
    (#)In HMAC mode, there is no Accumulate API. Only Start API is available.
    (#)In case of using DMA, call the DMA start processing e.g. HAL_HASHEx_SHA224_Start_DMA().
       After that, call the finish function in order to get the digest value
       e.g. HAL_HASHEx_SHA224_Finish()
    (#)Call HAL_HASH_DeInit() to deinitialize the HASH peripheral.

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

/** @addtogroup STM32F7xx_HAL_Driver
  * @{
  */
#if defined(STM32F756xx)

/** @defgroup HASHEx HASHEx
  * @brief HASH Extension HAL module driver.
  * @{
  */

#ifdef HAL_HASH_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @addtogroup HASHEx_Private_Functions
  * @{
  */
static void HASHEx_DMAXferCplt(DMA_HandleTypeDef *hdma);
static void HASHEx_WriteData(uint8_t *pInBuffer, uint32_t Size);
static void HASHEx_GetDigest(uint8_t *pMsgDigest, uint8_t Size);
static void HASHEx_DMAError(DMA_HandleTypeDef *hdma);
/**
  * @}
  */
  
/* Private functions ---------------------------------------------------------*/

/** @addtogroup HASHEx_Private_Functions
  * @{
  */

/**
  * @brief  Writes the input buffer in data register.
  * @param  pInBuffer: Pointer to input buffer
  * @param  Size: The size of input buffer
  * @retval None
  */
static void HASHEx_WriteData(uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t buffercounter;
  uint32_t inputaddr = (uint32_t) pInBuffer;
  
  for(buffercounter = 0; buffercounter < Size; buffercounter+=4)
  {
    HASH->DIN = *(uint32_t*)inputaddr;
    inputaddr+=4;
  }
}

/**
  * @brief  Provides the message digest result.
  * @param  pMsgDigest: Pointer to the message digest
  * @param  Size: The size of the message digest in bytes
  * @retval None
  */
static void HASHEx_GetDigest(uint8_t *pMsgDigest, uint8_t Size)
{
  uint32_t msgdigest = (uint32_t)pMsgDigest;
  
  switch(Size)
  {
  case 16:
    /* Read the message digest */
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[0]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[1]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[2]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[3]);
    break;
  case 20:
    /* Read the message digest */
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[0]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[1]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[2]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[3]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[4]);
    break;
  case 28:
    /* Read the message digest */
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[0]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[1]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[2]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[3]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[4]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH_DIGEST->HR[5]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH_DIGEST->HR[6]);
    break;
  case 32:
    /* Read the message digest */
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[0]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[1]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[2]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[3]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH->HR[4]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH_DIGEST->HR[5]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH_DIGEST->HR[6]);
    msgdigest+=4;
    *(uint32_t*)(msgdigest) = __REV(HASH_DIGEST->HR[7]);
    break;
  default:
    break;
  }
}

/**
  * @brief  DMA HASH Input Data complete callback. 
  * @param  hdma: DMA handle
  * @retval None
  */
static void HASHEx_DMAXferCplt(DMA_HandleTypeDef *hdma)
{
  HASH_HandleTypeDef* hhash = ( HASH_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  uint32_t inputaddr = 0;
  uint32_t buffersize = 0;
  
  if((HASH->CR & HASH_CR_MODE) != HASH_CR_MODE)
  {
    /* Disable the DMA transfer */
    HASH->CR &= (uint32_t)(~HASH_CR_DMAE);
    
    /* Change HASH peripheral state */
    hhash->State = HAL_HASH_STATE_READY;
    
    /* Call Input data transfer complete callback */
    HAL_HASH_InCpltCallback(hhash);
  }
  else
  {
    /* Increment Interrupt counter */
    hhash->HashInCount++;
    /* Disable the DMA transfer before starting the next transfer */
    HASH->CR &= (uint32_t)(~HASH_CR_DMAE);
    
    if(hhash->HashInCount <= 2)
    {
      /* In case HashInCount = 1, set the DMA to transfer data to HASH DIN register */
      if(hhash->HashInCount == 1)
      {
        inputaddr = (uint32_t)hhash->pHashInBuffPtr;
        buffersize = hhash->HashBuffSize;
      }
      /* In case HashInCount = 2, set the DMA to transfer key to HASH DIN register */
      else if(hhash->HashInCount == 2)
      {
        inputaddr = (uint32_t)hhash->Init.pKey;
        buffersize = hhash->Init.KeySize;
      }
      /* Configure the number of valid bits in last word of the message */
      HASH->STR |= 8 * (buffersize % 4);
      
      /* Set the HASH DMA transfer complete */
      hhash->hdmain->XferCpltCallback = HASHEx_DMAXferCplt;
      
      /* Enable the DMA In DMA Stream */
      HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (buffersize%4 ? (buffersize+3)/4:buffersize/4));
      
      /* Enable DMA requests */
      HASH->CR |= (HASH_CR_DMAE);
    }
    else
    {
      /* Disable the DMA transfer */
      HASH->CR &= (uint32_t)(~HASH_CR_DMAE);
      
      /* Reset the InCount */
      hhash->HashInCount = 0;
      
      /* Change HASH peripheral state */
      hhash->State = HAL_HASH_STATE_READY;
      
      /* Call Input data transfer complete callback */
      HAL_HASH_InCpltCallback(hhash);
    }
  }
}

/**
  * @brief  DMA HASH communication error callback. 
  * @param  hdma: DMA handle
  * @retval None
  */
static void HASHEx_DMAError(DMA_HandleTypeDef *hdma)
{
  HASH_HandleTypeDef* hhash = ( HASH_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  hhash->State= HAL_HASH_STATE_READY;
  HAL_HASH_ErrorCallback(hhash);
}

 /**
  * @}
  */
  
/* Exported functions --------------------------------------------------------*/
/** @addtogroup HASHEx_Exported_Functions
  * @{
  */
  
/** @defgroup  HASHEx_Group1 HASH processing functions  
 *  @brief   processing functions using polling mode 
 *
@verbatim   
 ===============================================================================
              ##### HASH processing using polling mode functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in polling mode
          the hash value using one of the following algorithms:
      (+) SHA224
      (+) SHA256

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the HASH peripheral in SHA224 mode
  *         then processes pInBuffer. The digest is available in pOutBuffer
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 28 bytes.
  * @param  Timeout: Specify Timeout value   
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA224_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA224 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA224 | HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 28);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initializes the HASH peripheral in SHA256 mode then processes pInBuffer.
            The digest is available in pOutBuffer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed). 
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 32 bytes.
  * @param  Timeout: Specify Timeout value   
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA256_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA256 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA256 | HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 32);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hhash);  
  
  /* Return function status */
  return HAL_OK;
}


/**
  * @brief  Initializes the HASH peripheral in SHA224 mode
  *         then processes pInBuffer. The digest is available in pOutBuffer
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA224_Accumulate(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA224 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA224 | HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}


/**
  * @brief  Initializes the HASH peripheral in SHA256 mode then processes pInBuffer.
            The digest is available in pOutBuffer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA256_Accumulate(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
   /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA256 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA256 | HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}


/**
  * @}
  */

/** @defgroup HASHEx_Group2 HMAC processing functions using polling mode 
 *  @brief   HMAC processing functions using polling mode . 
 *
@verbatim   
 ===============================================================================
            ##### HMAC processing using polling mode functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in polling mode
          the HMAC value using one of the following algorithms:
      (+) SHA224
      (+) SHA256

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the HASH peripheral in HMAC SHA224 mode
  *         then processes pInBuffer. The digest is available in pOutBuffer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed). 
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 20 bytes.
  * @param  Timeout: Timeout value 
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMACEx_SHA224_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
                                                  
   /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Check if key size is greater than 64 bytes */
    if(hhash->Init.KeySize > 64)
    {
      /* Select the HMAC SHA224 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA224 | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY | HASH_CR_INIT);
    }
    else
    {
      /* Select the HMAC SHA224 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA224 | HASH_ALGOMODE_HMAC | HASH_CR_INIT);
    }
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /************************** STEP 1 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(hhash->Init.pKey, hhash->Init.KeySize);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /************************** STEP 2 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((HAL_GetTick() - tickstart ) > Timeout)
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /************************** STEP 3 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(hhash->Init.pKey, hhash->Init.KeySize);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((HAL_GetTick() - tickstart ) > Timeout)
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 28);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initializes the HASH peripheral in HMAC SHA256 mode
  *         then processes pInBuffer. The digest is available in pOutBuffer
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed). 
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 20 bytes.
  * @param  Timeout: Timeout value 
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMACEx_SHA256_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Check if key size is greater than 64 bytes */
    if(hhash->Init.KeySize > 64)
    {
      /* Select the HMAC SHA256 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA256 | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY);
    }
    else
    {
      /* Select the HMAC SHA256 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA256 | HASH_ALGOMODE_HMAC);
    }
    /* Reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /************************** STEP 1 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(hhash->Init.pKey, hhash->Init.KeySize);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /************************** STEP 2 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(pInBuffer, Size);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((HAL_GetTick() - tickstart ) > Timeout)
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /************************** STEP 3 ******************************************/
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Write input buffer in data register */
  HASHEx_WriteData(hhash->Init.pKey, hhash->Init.KeySize);
  
  /* Start the digest calculation */
  __HAL_HASH_START_DIGEST();
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while((HASH->SR & HASH_FLAG_BUSY) == HASH_FLAG_BUSY)
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((HAL_GetTick() - tickstart ) > Timeout)
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 32);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_READY;
  
   /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup HASHEx_Group3 HASH processing functions using interrupt mode
 *  @brief   processing functions using interrupt mode. 
 *
@verbatim   
 ===============================================================================
              ##### HASH processing using interrupt functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in interrupt mode
          the hash value using one of the following algorithms:
      (+) SHA224
      (+) SHA256

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the HASH peripheral in SHA224 mode then processes pInBuffer.
  *         The digest is available in pOutBuffer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 20 bytes.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA224_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{
  uint32_t inputaddr;
  uint32_t buffercounter;
  uint32_t inputcounter;
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  if(hhash->HashITCounter == 0)
  {
    hhash->HashITCounter = 1;
  }
  else
  {
    hhash->HashITCounter = 0;
  }
  if(hhash->State == HAL_HASH_STATE_READY)
  {
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    hhash->HashInCount = Size;
    hhash->pHashInBuffPtr = pInBuffer;
    hhash->pHashOutBuffPtr = pOutBuffer;
    
    /* Check if initialization phase has already been performed */
    if(hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Select the SHA224 mode */
      HASH->CR |= HASH_ALGOSELECTION_SHA224;
      /* Reset the HASH processor core, so that the HASH will be ready to compute 
         the message digest of a new message */
      HASH->CR |= HASH_CR_INIT;
    }
    
    /* Set the phase */
    hhash->Phase = HAL_HASH_PHASE_PROCESS;
    
    /* Process Unlocked */
    __HAL_UNLOCK(hhash);
    
    /* Enable Interrupts */
    HASH->IMR = (HASH_IT_DINI | HASH_IT_DCI);
    
    /* Return function status */
    return HAL_OK;
  }
  if(__HAL_HASH_GET_FLAG(HASH_FLAG_DCIS))
  {
    /* Read the message digest */
    HASHEx_GetDigest(hhash->pHashOutBuffPtr, 28);
    if(hhash->HashInCount == 0)
    {
      /* Disable Interrupts */
      HASH->IMR = 0;
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_READY;
      /* Call digest computation complete callback */
      HAL_HASH_DgstCpltCallback(hhash);
    }
  }
  if(__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS))
  {
    if(hhash->HashInCount > 64)
    {
      inputaddr = (uint32_t)hhash->pHashInBuffPtr;
      /* Write the Input block in the Data IN register */
      for(buffercounter = 0; buffercounter < 64; buffercounter+=4)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        inputaddr+=4;
      }
      if(hhash->HashITCounter == 0)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        if(hhash->HashInCount >= 68)
        {
          /* Decrement buffer counter */
          hhash->HashInCount -= 68;
          hhash->pHashInBuffPtr+= 68;
        }
        else
        {
          hhash->HashInCount -= 64;
        }
      }
      else
      {
        /* Decrement buffer counter */
        hhash->HashInCount -= 64;
        hhash->pHashInBuffPtr+= 64;
      }
    }
    else
    {
      /* Get the buffer address */
      inputaddr = (uint32_t)hhash->pHashInBuffPtr;
      /* Get the buffer counter */
      inputcounter = hhash->HashInCount;
      /* Disable Interrupts */
      HASH->IMR &= ~(HASH_IT_DINI);
      /* Configure the number of valid bits in last word of the message */
      __HAL_HASH_SET_NBVALIDBITS(inputcounter);
      
      if((inputcounter > 4) && (inputcounter%4))
      {
        inputcounter = (inputcounter+4-inputcounter%4);
      }
      
      /* Write the Input block in the Data IN register */
      for(buffercounter = 0; buffercounter < inputcounter/4; buffercounter++)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        inputaddr+=4;
      }
      /* Start the digest calculation */
      __HAL_HASH_START_DIGEST();
      /* Reset buffer counter */
      hhash->HashInCount = 0;
    }
    /* Call Input data transfer complete callback */
    HAL_HASH_InCpltCallback(hhash);
  }
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}


/**
  * @brief  Initializes the HASH peripheral in SHA256 mode then processes pInBuffer.
  *         The digest is available in pOutBuffer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 20 bytes.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA256_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{
  uint32_t inputaddr;
  uint32_t buffercounter;
  uint32_t inputcounter;
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  if(hhash->HashITCounter == 0)
  {
    hhash->HashITCounter = 1;
  }
  else
  {
    hhash->HashITCounter = 0;
  }
  if(hhash->State == HAL_HASH_STATE_READY)
  {
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    hhash->HashInCount = Size;
    hhash->pHashInBuffPtr = pInBuffer;
    hhash->pHashOutBuffPtr = pOutBuffer;
    
    /* Check if initialization phase has already been performed */
    if(hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Select the SHA256 mode */
      HASH->CR |= HASH_ALGOSELECTION_SHA256;
      /* Reset the HASH processor core, so that the HASH will be ready to compute 
         the message digest of a new message */
      HASH->CR |= HASH_CR_INIT;
    }
    
    /* Set the phase */
    hhash->Phase = HAL_HASH_PHASE_PROCESS;
    
    /* Process Unlocked */
    __HAL_UNLOCK(hhash);
    
    /* Enable Interrupts */
    HASH->IMR = (HASH_IT_DINI | HASH_IT_DCI);
    
    /* Return function status */
    return HAL_OK;
  }
  if(__HAL_HASH_GET_FLAG(HASH_FLAG_DCIS))
  {
    /* Read the message digest */
    HASHEx_GetDigest(hhash->pHashOutBuffPtr, 32);
    if(hhash->HashInCount == 0)
    {
      /* Disable Interrupts */
      HASH->IMR = 0;
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_READY;
      /* Call digest computation complete callback */
      HAL_HASH_DgstCpltCallback(hhash);
    }
  }
  if(__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS))
  {
    if(hhash->HashInCount > 64)
    {
      inputaddr = (uint32_t)hhash->pHashInBuffPtr;
      /* Write the Input block in the Data IN register */
      for(buffercounter = 0; buffercounter < 64; buffercounter+=4)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        inputaddr+=4;
      }
      if(hhash->HashITCounter == 0)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        
        if(hhash->HashInCount >= 68)
        {
          /* Decrement buffer counter */
          hhash->HashInCount -= 68;
          hhash->pHashInBuffPtr+= 68;
        }
        else
        {
          hhash->HashInCount -= 64;
        }
      }
      else
      {
        /* Decrement buffer counter */
        hhash->HashInCount -= 64;
        hhash->pHashInBuffPtr+= 64;
      }
    }
    else
    {
      /* Get the buffer address */
      inputaddr = (uint32_t)hhash->pHashInBuffPtr;
      /* Get the buffer counter */
      inputcounter = hhash->HashInCount;
      /* Disable Interrupts */
      HASH->IMR &= ~(HASH_IT_DINI);
      /* Configure the number of valid bits in last word of the message */
      __HAL_HASH_SET_NBVALIDBITS(inputcounter);
      
      if((inputcounter > 4) && (inputcounter%4))
      {
        inputcounter = (inputcounter+4-inputcounter%4);
      }
      
      /* Write the Input block in the Data IN register */
      for(buffercounter = 0; buffercounter < inputcounter/4; buffercounter++)
      {
        HASH->DIN = *(uint32_t*)inputaddr;
        inputaddr+=4;
      }
      /* Start the digest calculation */
      __HAL_HASH_START_DIGEST();
      /* Reset buffer counter */
      hhash->HashInCount = 0;
    }
    /* Call Input data transfer complete callback */
    HAL_HASH_InCpltCallback(hhash);
  }
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief This function handles HASH interrupt request.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @retval None
  */
void HAL_HASHEx_IRQHandler(HASH_HandleTypeDef *hhash)
{
  switch(HASH->CR & HASH_CR_ALGO)
  {
    
    case HASH_ALGOSELECTION_SHA224:
       HAL_HASHEx_SHA224_Start_IT(hhash, NULL, 0, NULL);
    break;
    
    case HASH_ALGOSELECTION_SHA256:
      HAL_HASHEx_SHA256_Start_IT(hhash, NULL, 0, NULL);
    break;
    
    default:
    break;
  }
}

/**
  * @}
  */

/** @defgroup HASHEx_Group4 HASH processing functions using DMA mode
 *  @brief   processing functions using DMA mode. 
 *
@verbatim   
 ===============================================================================
                ##### HASH processing using DMA functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in DMA mode
          the hash value using one of the following algorithms:
      (+) SHA224
      (+) SHA256

@endverbatim
  * @{
  */


/**
  * @brief  Initializes the HASH peripheral in SHA224 mode then enables DMA to
            control data transfer. Use HAL_HASH_SHA224_Finish() to get the digest.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA224_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t inputaddr  = (uint32_t)pInBuffer;
  
   /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA224 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA224 | HASH_CR_INIT;
  }
   
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
    
  /* Set the HASH DMA transfer complete callback */
  hhash->hdmain->XferCpltCallback = HASHEx_DMAXferCplt;
  /* Set the DMA error callback */
  hhash->hdmain->XferErrorCallback = HASHEx_DMAError;
  
  /* Enable the DMA In DMA Stream */
  HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (Size%4 ? (Size+3)/4:Size/4));
  
  /* Enable DMA requests */
  HASH->CR |= (HASH_CR_DMAE);
  
   /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Returns the computed digest in SHA224
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 28 bytes.
  * @param  Timeout: Timeout value    
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA224_Finish(HASH_HandleTypeDef *hhash, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change HASH peripheral state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while(HAL_IS_BIT_CLR(HASH->SR, HASH_FLAG_DCIS))
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 28);
      
  /* Change HASH peripheral state */
  hhash->State = HAL_HASH_STATE_READY;
  
   /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initializes the HASH peripheral in SHA256 mode then enables DMA to
            control data transfer. Use HAL_HASH_SHA256_Finish() to get the digest.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA256_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t inputaddr  = (uint32_t)pInBuffer;
  
   /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Select the SHA256 mode and reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_ALGOSELECTION_SHA256 | HASH_CR_INIT;
  }
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(Size);
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
    
  /* Set the HASH DMA transfer complete callback */
  hhash->hdmain->XferCpltCallback = HASHEx_DMAXferCplt;
  /* Set the DMA error callback */
  hhash->hdmain->XferErrorCallback = HASHEx_DMAError;
  
  /* Enable the DMA In DMA Stream */
  HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (Size%4 ? (Size+3)/4:Size/4));
  
  /* Enable DMA requests */
  HASH->CR |= (HASH_CR_DMAE);
  
   /* Process UnLock */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Returns the computed digest in SHA256.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pOutBuffer: Pointer to the computed digest. Its size must be 32 bytes.
  * @param  Timeout: Timeout value    
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASHEx_SHA256_Finish(HASH_HandleTypeDef *hhash, uint8_t* pOutBuffer, uint32_t Timeout)
{
  uint32_t tickstart = 0;   
  
   /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change HASH peripheral state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Get tick */
  tickstart = HAL_GetTick();
  
  while(HAL_IS_BIT_CLR(HASH->SR, HASH_FLAG_DCIS))
  {
    /* Check for the Timeout */
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        /* Change state */
        hhash->State = HAL_HASH_STATE_TIMEOUT;
        
        /* Process Unlocked */          
        __HAL_UNLOCK(hhash);
        
        return HAL_TIMEOUT;
      }
    }
  }
  
  /* Read the message digest */
  HASHEx_GetDigest(pOutBuffer, 32);
  
  /* Change HASH peripheral state */
  hhash->State = HAL_HASH_STATE_READY;
  
   /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}


/**
  * @}
  */
/** @defgroup HASHEx_Group5 HMAC processing functions using DMA mode 
 *  @brief   HMAC processing functions using DMA mode . 
 *
@verbatim   
 ===============================================================================
                ##### HMAC processing using DMA functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in DMA mode
          the HMAC value using one of the following algorithms:
      (+) SHA224
      (+) SHA256

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the HASH peripheral in HMAC SHA224 mode
  *         then enables DMA to control data transfer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMACEx_SHA224_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t inputaddr;
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Save buffer pointer and size in handle */
  hhash->pHashInBuffPtr = pInBuffer;
  hhash->HashBuffSize = Size;
  hhash->HashInCount = 0;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Check if key size is greater than 64 bytes */
    if(hhash->Init.KeySize > 64)
    {
      /* Select the HMAC SHA224 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA224 | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY | HASH_CR_INIT);
    }
    else
    {
      /* Select the HMAC SHA224 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA224 | HASH_ALGOMODE_HMAC | HASH_CR_INIT);
    }
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Get the key address */
  inputaddr = (uint32_t)(hhash->Init.pKey);
  
  /* Set the HASH DMA transfer complete callback */
  hhash->hdmain->XferCpltCallback = HASHEx_DMAXferCplt;
  /* Set the DMA error callback */
  hhash->hdmain->XferErrorCallback = HASHEx_DMAError;
  
  /* Enable the DMA In DMA Stream */
  HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (hhash->Init.KeySize%4 ? (hhash->Init.KeySize+3)/4:hhash->Init.KeySize/4));
  /* Enable DMA requests */
  HASH->CR |= (HASH_CR_DMAE);
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initializes the HASH peripheral in HMAC SHA256 mode
  *         then enables DMA to control data transfer.
  * @param  hhash: pointer to a HASH_HandleTypeDef structure that contains
  *         the configuration information for HASH module
  * @param  pInBuffer: Pointer to the input buffer (buffer to be hashed).
  * @param  Size: Length of the input buffer in bytes.
  *          If the Size is not multiple of 64 bytes, the padding is managed by hardware.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMACEx_SHA256_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t inputaddr;
  
  /* Process Locked */
  __HAL_LOCK(hhash);
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Save buffer pointer and size in handle */
  hhash->pHashInBuffPtr = pInBuffer;
  hhash->HashBuffSize = Size;
  hhash->HashInCount = 0;
  
  /* Check if initialization phase has already been performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Check if key size is greater than 64 bytes */
    if(hhash->Init.KeySize > 64)
    {
      /* Select the HMAC SHA256 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA256 | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY);
    }
    else
    {
      /* Select the HMAC SHA256 mode */
      HASH->CR |= (HASH_ALGOSELECTION_SHA256 | HASH_ALGOMODE_HMAC);
    }
    /* Reset the HASH processor core, so that the HASH will be ready to compute 
       the message digest of a new message */
    HASH->CR |= HASH_CR_INIT;
  }
  
  /* Set the phase */
  hhash->Phase = HAL_HASH_PHASE_PROCESS;
  
  /* Configure the number of valid bits in last word of the message */
  __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
  
  /* Get the key address */
  inputaddr = (uint32_t)(hhash->Init.pKey);
  
  /* Set the HASH DMA transfer complete callback */
  hhash->hdmain->XferCpltCallback = HASHEx_DMAXferCplt;
  /* Set the DMA error callback */
  hhash->hdmain->XferErrorCallback = HASHEx_DMAError;
  
  /* Enable the DMA In DMA Stream */
  HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (hhash->Init.KeySize%4 ? (hhash->Init.KeySize+3)/4:hhash->Init.KeySize/4));
  /* Enable DMA requests */
  HASH->CR |= (HASH_CR_DMAE);
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @}
  */

/**
  * @}
  */
#endif /* HAL_HASH_MODULE_ENABLED */

/**
  * @}
  */
#endif /* STM32F756xx */

/**
  * @}
  */

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