NixieTubeClock/STM32L432KC_Template/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_hash.c

/**
  ******************************************************************************
  * @file    stm32l4xx_hal_hash.c
  * @author  MCD Application Team
  * @brief   HASH HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of the HASH peripheral:
  *           + Initialization and de-initialization methods
  *           + HASH or HMAC processing in polling mode
  *           + HASH or HMAC processing in interrupt mode
  *           + HASH or HMAC processing in DMA mode
  *           + Peripheral State methods
  *           + HASH or HMAC processing suspension/resumption  
  *         
  @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 __HASH_CLK_ENABLE()
        (##) When resorting to interrupt-based APIs (e.g. HAL_HASH_xxx_Start_IT())
            (+++) 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() API
        (##) When resorting to DMA-based APIs  (e.g. HAL_HASH_xxx_Start_DMA())
            (+++) Enable the DMAx interface clock using 
                   __DMAx_CLK_ENABLE()
            (+++) Configure and enable one DMA stream to manage 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: use
                 HAL_NVIC_SetPriority() and 
                 HAL_NVIC_EnableIRQ()
                
    (#)Initialize the HASH HAL using HAL_HASH_Init(). This function:
        (##) resorts to HAL_HASH_MspInit() for low-level initialization,
        (##) configures the data type: 1-bit, 8-bit, 16-bit or 32-bit.
        
    (#)Three processing schemes 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_HASH_xxx_Start() for HASH or HAL_HMAC_xxx_Start() for HMAC
        (##) Interrupt mode: processing APIs are not blocking functions
                i.e. they process the data under interrupt,
                e.g. HAL_HASH_xxx_Start_IT() for HASH or HAL_HMAC_xxx_Start_IT() for HMAC
        (##) 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_HASH_xxx_Start_DMA() for HASH or HAL_HMAC_xxx_Start_DMA() 
                for HMAC. Note that in DMA mode, a call to HAL_HASH_xxx_Finish() 
                is then required to retrieve the digest.
                
    (#)When the processing function is called after HAL_HASH_Init(), the HASH peripheral is 
       initialized and processes the buffer fed in input. When the input data have all been
       fed to the IP, the digest computation can start.
       
    (#)Multi-buffer processing is possible in polling and DMA mode. 
        (##) In polling mode, only multi-buffer HASH processing is possible. 
             API HAL_HASH_xxx_Accumulate() must be called for each input buffer, except for the last one.
             User must resort to HAL_HASH_xxx_Start() to enter the last one and retrieve as 
             well the computed digest.
             
        (##) In DMA mode, multi-buffer HASH and HMAC processing are possible.

              (+++) HASH processing: once initialization is done, MDMAT bit must be set thru __HAL_HASH_SET_MDMAT() macro.
             From that point, each buffer can be fed to the IP thru HAL_HASH_xxx_Start_DMA() API.
             Before entering the last buffer, reset the MDMAT bit with __HAL_HASH_RESET_MDMAT()
             macro then wrap-up the HASH processing in feeding the last input buffer thru the
             same API HAL_HASH_xxx_Start_DMA(). The digest can then be retrieved with a call to  
             API HAL_HASH_xxx_Finish().
             
             (+++) HMAC processing (requires to resort to extended functions): 
             after initialization, the key and the first input buffer are entered
             in the IP with the API HAL_HMACEx_xxx_Step1_2_DMA(). This carries out HMAC step 1 and
             starts step 2.
             The following buffers are next entered with the API  HAL_HMACEx_xxx_Step2_DMA(). At this
             point, the HMAC processing is still carrying out step 2.
             Then, step 2 for the last input buffer and step 3 are carried out by a single call 
             to HAL_HMACEx_xxx_Step2_3_DMA().
             
             The digest can finally be retrieved with a call to API HAL_HASH_xxx_Finish().
              
             
    (#)Context swapping. 
        (##) Two APIs are available to suspend HASH or HMAC processing: 
             (+++) HAL_HASH_SwFeed_ProcessSuspend() when data are entered by software (polling or IT mode),
             (+++) HAL_HASH_DMAFeed_ProcessSuspend() when data are entered by DMA.    
                              
        (##) When HASH or HMAC processing is suspended, HAL_HASH_ContextSaving() allows
            to save in memory the IP context. This context can be restored afterwards
            to resume the HASH processing thanks to HAL_HASH_ContextRestoring().
            
        (##) Once the HASH IP has been restored to the same configuration as that at suspension
             time, processing can be restarted with the same API call (same API, same handle,
             same parameters) as done before the suspension. Relevant parameters to restart at 
             the proper location are internally saved in the HASH handle.   
                                           
    (#)Call HAL_HASH_DeInit() to deinitialize the HASH peripheral.

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 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 "stm32l4xx_hal.h"

#ifdef HAL_HASH_MODULE_ENABLED

#if defined (STM32L4A6xx) || defined (STM32L4S5xx) || defined (STM32L4S7xx) || defined (STM32L4S9xx)

/** @addtogroup STM32L4xx_HAL_Driver
  * @{
  */

/** @defgroup HASH  HASH
  * @brief HASH HAL module driver.
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup HASH_Private_Constants HASH Private Constants
  * @{
  */
 
/** @defgroup HASH_Digest_Calculation_Status HASH Digest Calculation Status 
  * @{
  */   
#define HASH_DIGEST_CALCULATION_NOT_STARTED       ((uint32_t)0x00000000) /*!< DCAL not set after input data written in DIN register */ 
#define HASH_DIGEST_CALCULATION_STARTED           ((uint32_t)0x00000001) /*!< DCAL set after input data written in DIN register     */
/**
  * @}
  */ 

/** @defgroup HASH_Number_Of_CSR_Registers HASH Number of Context Swap Registers 
  * @{
  */ 
#define HASH_NUMBER_OF_CSR_REGISTERS              54     /*!< Number of Context Swap Registers */ 
/**
  * @}
  */ 
  
/** @defgroup HASH_TimeOut_Value HASH TimeOut Value 
  * @{
  */ 
#define HASH_TIMEOUTVALUE                         1000   /*!< Time-out value  */
/**
  * @}
  */
   
/** @defgroup HASH_DMA_Suspension_Words_Limit HASH DMA suspension words limit 
  * @{
  */ 
#define HASH_DMA_SUSPENSION_WORDS_LIMIT             20   /*!< Number of words below which DMA suspension is aborted */
/**
  * @}
  */  
   
/**
  * @}
  */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup HASH_Private_Functions HASH Private Functions
  * @{
  */ 
static void HASH_DMAXferCplt(DMA_HandleTypeDef *hdma);
static void HASH_DMAError(DMA_HandleTypeDef *hdma);
static void HASH_GetDigest(uint8_t *pMsgDigest, uint8_t Size);
static HAL_StatusTypeDef HASH_WaitOnFlagUntilTimeout(HASH_HandleTypeDef *hhash, uint32_t Flag, FlagStatus Status, uint32_t Timeout);
static HAL_StatusTypeDef HASH_WriteData(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size);
static HAL_StatusTypeDef HASH_IT(HASH_HandleTypeDef *hhash);
static uint32_t HASH_Write_Block_Data(HASH_HandleTypeDef *hhash);
static HAL_StatusTypeDef HMAC_Processing(HASH_HandleTypeDef *hhash, uint32_t Timeout);
/**
  * @}
  */

/** @defgroup HASH_Exported_Functions HASH Exported Functions
  * @{
  */

/** @defgroup HASH_Exported_Functions_Group1 Initialization and de-initialization functions 
 *  @brief    Initialization, configuration and call-back functions. 
 *
@verbatim    
 ===============================================================================
              ##### Initialization and de-initialization functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Initialize the HASH according to the specified parameters 
          in the HASH_InitTypeDef and create the associated handle
      (+) DeInitialize the HASH peripheral
      (+) Initialize the HASH MCU Specific Package (MSP)
      (+) DeInitialize the HASH MSP
      
    [..]  This section provides as well call back functions definitions for user
          code to manage:
      (+) Input data transfer to IP completion  
      (+) Calculated digest retrieval completion
      (+) Error management                   
           
      
 
@endverbatim
  * @{
  */

/**
  * @brief  Initialize the HASH according to the specified parameters in the
            HASH_HandleTypeDef and create the associated handle.
  * @note   Only MDMAT and DATATYPE bits of HASH IP are set by HAL_HASH_Init(),
  *         other configuration bits are set by HASH or HMAC processing APIs. 
  * @note   MDMAT bit is systematically reset by HAL_HASH_Init(). To set it for 
  *         multi-buffer HASH processing, user needs to resort to 
  *         __HAL_HASH_SET_MDMAT() macro. For HMAC multi-buffer processing, the
  *         relevant APIs manage themselves the MDMAT bit.   
  * @param  hhash: HASH handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_Init(HASH_HandleTypeDef *hhash)
{
  /* Check the parameters */
  assert_param(IS_HASH_DATATYPE(hhash->Init.DataType));
  
  /* Check the hash handle allocation */
  if(hhash == NULL)
  {
    return HAL_ERROR;
  }
  
  if(hhash->State == HAL_HASH_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hhash->Lock = HAL_UNLOCKED;

    /* Init the low level hardware */
    HAL_HASH_MspInit(hhash);
  }  
  
    /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;

  /* Reset HashInCount, HashITCounter, HashBuffSize and NbWordsAlreadyPushed */
  hhash->HashInCount = 0;
  hhash->HashBuffSize = 0;
  hhash->HashITCounter = 0;
  hhash->NbWordsAlreadyPushed = 0;
  /* Reset digest calculation bridle (MDMAT bit control) */
  hhash->DigestCalculationDisable = RESET;
  /* Set phase to READY */
  hhash->Phase = HAL_HASH_PHASE_READY;   
  
  /* Set the data type and reset MDMAT bit */
  MODIFY_REG(HASH->CR, HASH_CR_DATATYPE|HASH_CR_MDMAT, hhash->Init.DataType);
  
  /* Reset HASH handle status */
  hhash->Status = HAL_OK;
  
  /* Set the HASH state to Ready */
  hhash->State = HAL_HASH_STATE_READY;
  
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  DeInitialize the HASH peripheral. 
  * @param  hhash: HASH handle.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_DeInit(HASH_HandleTypeDef *hhash)
{ 
  /* Check the HASH handle allocation */
  if(hhash == NULL)
  {
    return HAL_ERROR;
  }
  
  /* Change the HASH state */
  hhash->State = HAL_HASH_STATE_BUSY;
  
  /* Set the default HASH phase */
  hhash->Phase = HAL_HASH_PHASE_READY;
  
  /* Reset HashInCount, HashITCounter and HashBuffSize */
  hhash->HashInCount = 0;
  hhash->HashBuffSize = 0;
  hhash->HashITCounter = 0;
  /* Reset digest calculation bridle (MDMAT bit control) */
  hhash->DigestCalculationDisable = RESET;  
  
  /* DeInit the low level hardware: CLOCK, NVIC.*/
  HAL_HASH_MspDeInit(hhash);
  
  /* Reset HASH handle status */
  hhash->Status = HAL_OK;  
  
  /* Set the HASH state to Ready */
  hhash->State = HAL_HASH_STATE_RESET;
   
  /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Initialize the HASH MSP.
  * @param  hhash: HASH handle.
  * @retval None
  */
__weak void HAL_HASH_MspInit(HASH_HandleTypeDef *hhash)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);

  /* NOTE : This function should not be modified; when the callback is needed,
            HAL_HASH_MspInit() can be implemented in the user file.
   */
}

/**
  * @brief  DeInitialize the HASH MSP.
  * @param  hhash: HASH handle.
  * @retval None
  */
__weak void HAL_HASH_MspDeInit(HASH_HandleTypeDef *hhash)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);

  /* NOTE : This function should not be modified; when the callback is needed,
            HAL_HASH_MspDeInit() can be implemented in the user file.
   */
}

/**
  * @brief  Input data transfer complete call back.
  * @note   HAL_HASH_InCpltCallback() is called when the complete input message 
  *         has been fed to the IP. This API is invoked only when input data are
  *         entered under interruption or thru DMA. 
  * @note   In case of HASH or HMAC multi-buffer DMA feeding case (MDMAT bit set), 
  *         HAL_HASH_InCpltCallback() is called at the end of each buffer feeding 
  *         to the IP.       
  * @param  hhash: HASH handle.
  * @retval None
  */
__weak void HAL_HASH_InCpltCallback(HASH_HandleTypeDef *hhash)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);

  /* NOTE : This function should not be modified; when the callback is needed,
            HAL_HASH_InCpltCallback() can be implemented in the user file.
   */
}

/**
  * @brief  Digest computation complete call back. 
  * @note   HAL_HASH_DgstCpltCallback() is used under interruption, is not 
  *         relevant with DMA.
  * @param  hhash: HASH handle.
  * @retval None
  */
__weak void HAL_HASH_DgstCpltCallback(HASH_HandleTypeDef *hhash)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);

  /* NOTE : This function should not be modified; when the callback is needed,
            HAL_HASH_DgstCpltCallback() can be implemented in the user file.
   */
}
                          
/**
  * @brief  Error callback.
  * @note   Code user can resort to hhash->Status (HAL_ERROR, HAL_TIMEOUT,...)
  *         to retrieve the error type.
  * @param  hhash: HASH handle.
  * @retval None
  */
__weak void HAL_HASH_ErrorCallback(HASH_HandleTypeDef *hhash)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);

  /* NOTE : This function should not be modified; when the callback is needed,
            HAL_HASH_ErrorCallback() can be implemented in the user file.
   */
}


/**
  * @}
  */

/** @defgroup HASH_Exported_Functions_Group2 HASH processing functions in polling mode 
 *  @brief   HASH processing functions using polling mode. 
 *
@verbatim   
 ===============================================================================
                 ##### Polling mode HASH processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in polling mode
          the hash value using one of the following algorithms:
      (+) MD5
         (++) HAL_HASH_MD5_Start() 
         (++) HAL_HASH_MD5_Accumulate()                
      (+) SHA1
         (++) HAL_HASH_SHA1_Start() 
         (++) HAL_HASH_SHA1_Accumulate()          
      
    [..] For a single buffer to be hashed, user can resort to HAL_HASH_xxx_Start().
          
    [..]  In case of multi-buffer HASH processing (a single digest is computed while
          several buffers are fed to the IP), the user can resort to successive calls
          to HAL_HASH_xxx_Accumulate() and wrap-up the digest computation by a call
          to HAL_HASH_xxx_Start(). 

@endverbatim
  * @{
  */

/**
  * @brief  Initialize the HASH peripheral in MD5 mode, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 16 bytes.
  * @param  Timeout: Timeout value  
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_MD5_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  return HASH_Start(hhash, pInBuffer, Size, pOutBuffer, Timeout, HASH_ALGOSELECTION_MD5); 
}

/**
  * @brief  If not already done, initialize the HASH peripheral in MD5 mode then 
  *         processes pInBuffer.
  * @note   Consecutive calls to HAL_HASH_MD5_Accumulate() can be used to feed 
  *         several input buffers back-to-back to the IP that will yield a single
  *         HASH signature once all buffers have been entered. Wrap-up of input 
  *         buffers feeding and retrieval of digest is done by a call to 
  *         HAL_HASH_MD5_Start().  
  * @note   Field hhash->Phase of HASH handle is tested to check whether or not
  *         the IP has already been initialized.   
  * @note   Digest is not retrieved by this API, user must resort to HAL_HASH_MD5_Start()
  *         to read it, feeding at the same time the last input buffer to the IP.
  * @note   The input buffer size (in bytes) must be a multiple of 4 otherwise, the
  *         HASH digest computation is corrupted. Only HAL_HASH_MD5_Start() is able
  *         to manage the ending buffer with a length in bytes not a multiple of 4.       
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes, must be a multiple of 4.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_MD5_Accumulate(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{ 
  return  HASH_Accumulate(hhash, pInBuffer, Size,HASH_ALGOSELECTION_MD5);
}

/**
  * @brief  Initialize the HASH peripheral in SHA1 mode, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 20 bytes.
  * @param  Timeout: Timeout value    
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_SHA1_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  return HASH_Start(hhash, pInBuffer, Size, pOutBuffer, Timeout, HASH_ALGOSELECTION_SHA1);
}

/**
  * @brief  If not already done, initialize the HASH peripheral in SHA1 mode then 
  *         processes pInBuffer.
  * @note   Consecutive calls to HAL_HASH_SHA1_Accumulate() can be used to feed 
  *         several input buffers back-to-back to the IP that will yield a single
  *         HASH signature once all buffers have been entered. Wrap-up of input 
  *         buffers feeding and retrieval of digest is done by a call to 
  *         HAL_HASH_SHA1_Start().  
  * @note   Field hhash->Phase of HASH handle is tested to check whether or not
  *         the IP has already been initialized.   
  * @note   Digest is not retrieved by this API, user must resort to HAL_HASH_SHA1_Start()
  *         to read it, feeding at the same time the last input buffer to the IP.
  * @note   The input buffer size (in bytes) must be a multiple of 4 otherwise, the
  *         HASH digest computation is corrupted. Only HAL_HASH_SHA1_Start() is able
  *         to manage the ending buffer with a length in bytes not a multiple of 4.       
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes, must be a multiple of 4.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_SHA1_Accumulate(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  return  HASH_Accumulate(hhash, pInBuffer, Size,HASH_ALGOSELECTION_SHA1);
}


/**
  * @}
  */

/** @defgroup HASH_Exported_Functions_Group3 HASH processing functions in interrupt mode
 *  @brief   HASH processing functions using interrupt mode. 
 *
@verbatim   
 ===============================================================================
                 ##### Interruption mode HASH processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in interrupt mode
          the hash value using one of the following algorithms:
      (+) MD5
         (++) HAL_HASH_MD5_Start_IT()           
      (+) SHA1
         (++) HAL_HASH_SHA1_Start_IT()
         
    [..]  API HAL_HASH_IRQHandler() manages each HASH interruption.
    
    [..] Note that HAL_HASH_IRQHandler() manages as well HASH IP interruptions when in
         HMAC processing mode.
 

@endverbatim
  * @{
  */

/**
  * @brief  Initialize the HASH peripheral in MD5 mode, next process pInBuffer then
  *         read the computed digest in interruption mode.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 16 bytes.
  * @retval HAL status
  */ 
HAL_StatusTypeDef HAL_HASH_MD5_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{ 
  return HASH_Start_IT(hhash, pInBuffer, Size, pOutBuffer,HASH_ALGOSELECTION_MD5);
}


/**
  * @brief  Initialize the HASH peripheral in SHA1 mode, next process pInBuffer then
  *         read the computed digest in interruption mode.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 20 bytes.
  * @retval HAL status
  */   
HAL_StatusTypeDef HAL_HASH_SHA1_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{
  return HASH_Start_IT(hhash, pInBuffer, Size, pOutBuffer,HASH_ALGOSELECTION_SHA1);
}

/**
  * @brief Handle HASH interrupt request.
  * @param hhash: HASH handle.
  * @note  HAL_HASH_IRQHandler() handles interrupts in HMAC processing as well.    
  * @note  In case of error reported during the HASH interruption processing,
  *        HAL_HASH_ErrorCallback() API is called so that user code can
  *        manage the error. The error type is available in hhash->Status field.      
  * @retval None
  */
void HAL_HASH_IRQHandler(HASH_HandleTypeDef *hhash)
{
  hhash->Status = HASH_IT(hhash);
  if (hhash->Status != HAL_OK)
  {
    HAL_HASH_ErrorCallback(hhash); 
    /* After error handling by code user, reset HASH handle HAL status */
    hhash->Status = HAL_OK;
  }
}

/**
  * @}
  */

/** @defgroup HASH_Exported_Functions_Group4 HASH processing functions in DMA mode
 *  @brief   HASH processing functions using DMA mode. 
 *
@verbatim   
 ===============================================================================
                    ##### DMA mode HASH processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in DMA mode
          the hash value using one of the following algorithms:
      (+) MD5
         (++) HAL_HASH_MD5_Start_DMA() 
         (++) HAL_HASH_MD5_Finish()            
      (+) SHA1
         (++) HAL_HASH_SHA1_Start_DMA()
         (++) HAL_HASH_SHA1_Finish()
         
    [..]  When resorting to DMA mode to enter the data in the IP, user must resort
          to  HAL_HASH_xxx_Start_DMA() then read the resulting digest with 
          HAL_HASH_xxx_Finish(). 
          
    [..]  In case of multi-buffer HASH processing, MDMAT bit must first be set before
          the successive calls to HAL_HASH_xxx_Start_DMA(). Then, MDMAT bit needs to be 
          reset before the last call to HAL_HASH_xxx_Start_DMA(). Digest is finally
          retrieved thanks to HAL_HASH_xxx_Finish().                    
         

@endverbatim
  * @{
  */

/**
  * @brief  Initialize the HASH peripheral in MD5 mode then initiate a DMA transfer
  *         to feed the input buffer to the IP. 
  * @note   Once the DMA transfer is finished, HAL_HASH_MD5_Finish() API must
  *         be called to retrieve the computed digest.   
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @retval HAL status
  */ 
HAL_StatusTypeDef HAL_HASH_MD5_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{ 
  return HASH_Start_DMA(hhash, pInBuffer, Size, HASH_ALGOSELECTION_MD5); 
}

/**
  * @brief  Return the computed digest in MD5 mode.
  * @note   The API waits for DCIS to be set then reads the computed digest.
  * @note   HAL_HASH_MD5_Finish() can be used as well to retrieve the digest in
  *         HMAC MD5 mode.    
  * @param  hhash: HASH handle.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 16 bytes.
  * @param  Timeout: Timeout value.    
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_MD5_Finish(HASH_HandleTypeDef *hhash, uint8_t* pOutBuffer, uint32_t Timeout)
{
   return HASH_Finish(hhash, pOutBuffer, Timeout);   
}

/**
  * @brief  Initialize the HASH peripheral in SHA1 mode then initiate a DMA transfer
  *         to feed the input buffer to the IP. 
  * @note   Once the DMA transfer is finished, HAL_HASH_SHA1_Finish() API must
  *         be called to retrieve the computed digest.   
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @retval HAL status
  */ 
HAL_StatusTypeDef HAL_HASH_SHA1_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  return HASH_Start_DMA(hhash, pInBuffer, Size, HASH_ALGOSELECTION_SHA1); 
}


/**
  * @brief  Return the computed digest in SHA1 mode.
  * @note   The API waits for DCIS to be set then reads the computed digest.
  * @note   HAL_HASH_SHA1_Finish() can be used as well to retrieve the digest in
  *         HMAC SHA1 mode.     
  * @param  hhash: HASH handle.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 20 bytes.
  * @param  Timeout: Timeout value.    
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_SHA1_Finish(HASH_HandleTypeDef *hhash, uint8_t* pOutBuffer, uint32_t Timeout)
{  
   return HASH_Finish(hhash, pOutBuffer, Timeout);   
}

/**
  * @}
  */

/** @defgroup HASH_Exported_Functions_Group5 HMAC processing functions in polling mode
 *  @brief   HMAC processing functions using polling mode. 
 *
@verbatim   
 ===============================================================================
                 ##### Polling mode HMAC processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in polling mode
          the HMAC value using one of the following algorithms:
      (+) MD5
         (++) HAL_HMAC_MD5_Start()              
      (+) SHA1
         (++) HAL_HMAC_SHA1_Start() 


@endverbatim
  * @{
  */

/**
  * @brief  Initialize the HASH peripheral in HMAC MD5 mode, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 16 bytes.
  * @param  Timeout: Timeout value.  
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMAC_MD5_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{
  return HMAC_Start(hhash, pInBuffer, Size, pOutBuffer, Timeout, HASH_ALGOSELECTION_MD5);
}

/**
  * @brief  Initialize the HASH peripheral in HMAC SHA1 mode, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 20 bytes.
  * @param  Timeout: Timeout value.  
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HMAC_SHA1_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout)
{ 
  return HMAC_Start(hhash, pInBuffer, Size, pOutBuffer, Timeout, HASH_ALGOSELECTION_SHA1);
}

/**
  * @}
  */
  
  
/** @defgroup HASH_Exported_Functions_Group6 HMAC processing functions in interrupt mode
 *  @brief   HMAC processing functions using interrupt mode. 
 *
@verbatim   
 ===============================================================================
                 ##### Interrupt mode HMAC processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in interrupt mode
          the HMAC value using one of the following algorithms:
      (+) MD5
         (++) HAL_HMAC_MD5_Start_IT()              
      (+) SHA1
         (++) HAL_HMAC_SHA1_Start_IT() 

@endverbatim
  * @{
  */  
  

/**
  * @brief  Initialize the HASH peripheral in HMAC MD5 mode, next process pInBuffer then
  *         read the computed digest in interrupt mode.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 16 bytes.
  * @retval HAL status
  */  
HAL_StatusTypeDef HAL_HMAC_MD5_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{  
  return  HMAC_Start_IT(hhash, pInBuffer, Size, pOutBuffer, HASH_ALGOSELECTION_MD5);
}  

/**
  * @brief  Initialize the HASH peripheral in HMAC SHA1 mode, next process pInBuffer then
  *         read the computed digest in interrupt mode.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest. Digest size is 20 bytes.
  * @retval HAL status
  */ 
HAL_StatusTypeDef HAL_HMAC_SHA1_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer)
{ 
  return  HMAC_Start_IT(hhash, pInBuffer, Size, pOutBuffer, HASH_ALGOSELECTION_SHA1);
}  
  
/**
  * @}
  */
    
  

/** @defgroup HASH_Exported_Functions_Group7 HMAC processing functions in DMA mode
 *  @brief   HMAC processing functions using DMA modes. 
 *
@verbatim   
 ===============================================================================
                 ##### DMA mode HMAC processing functions #####
 ===============================================================================  
    [..]  This section provides functions allowing to calculate in DMA mode
          the HMAC value using one of the following algorithms:
      (+) MD5
         (++) HAL_HMAC_MD5_Start_DMA()              
      (+) SHA1
         (++) HAL_HMAC_SHA1_Start_DMA() 
         
    [..]  When resorting to DMA mode to enter the data in the IP for HMAC processing, 
          user must resort to  HAL_HMAC_xxx_Start_DMA() then read the resulting digest 
          with HAL_HASH_xxx_Finish().          

@endverbatim
  * @{
  */


/**
  * @brief  Initialize the HASH peripheral in HMAC MD5 mode then initiate the required 
  *         DMA transfers to feed the key and the input buffer to the IP. 
  * @note   Once the DMA transfers are finished (indicated by hhash->State set back 
  *         to HAL_HASH_STATE_READY), HAL_HASH_MD5_Finish() API must be called to retrieve 
  *         the computed digest.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize. 
  * @note   If MDMAT bit is set before calling this function (multi-buffer
  *          HASH processing case), the input buffer size (in bytes) must be 
  *          a multiple of 4 otherwise, the HASH digest computation is corrupted.
  *          For the processing of the last buffer of the thread, MDMAT bit must
  *          be reset and the buffer length (in bytes) doesn't have to be a 
  *          multiple of 4.          
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @retval HAL status
  */ 
HAL_StatusTypeDef HAL_HMAC_MD5_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  return  HMAC_Start_DMA(hhash, pInBuffer, Size, HASH_ALGOSELECTION_MD5);
}


/**
  * @brief  Initialize the HASH peripheral in HMAC SHA1 mode then initiate the required 
  *         DMA transfers to feed the key and the input buffer to the IP. 
  * @note   Once the DMA transfers are finished (indicated by hhash->State set back 
  *         to HAL_HASH_STATE_READY), HAL_HASH_SHA1_Finish() API must be called to retrieve 
  *         the computed digest.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.
  * @note   If MDMAT bit is set before calling this function (multi-buffer
  *          HASH processing case), the input buffer size (in bytes) must be 
  *          a multiple of 4 otherwise, the HASH digest computation is corrupted.
  *          For the processing of the last buffer of the thread, MDMAT bit must
  *          be reset and the buffer length (in bytes) doesn't have to be a 
  *          multiple of 4.                    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @retval HAL status
  */  
HAL_StatusTypeDef HAL_HMAC_SHA1_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  return  HMAC_Start_DMA(hhash, pInBuffer, Size, HASH_ALGOSELECTION_SHA1);
}

/**
  * @}
  */

/** @defgroup HASH_Exported_Functions_Group8 Peripheral states functions  
 *  @brief   Peripheral State functions. 
 *
@verbatim   
 ===============================================================================
                      ##### Peripheral State methods #####
 ===============================================================================  
    [..]
    This section permits to get in run-time the state and the peripheral handle 
    status of the peripheral:
      (+) HAL_HASH_GetState()            
      (+) HAL_HASH_GetStatus()
      
    [..]
    Additionally, this subsection provides functions allowing to save and restore
    the HASH or HMAC processing context in case of calculation suspension: 
      (+) HAL_HASH_ContextSaving()            
      (+) HAL_HASH_ContextRestoring()         
      
    [..]
    This subsection provides functions allowing to suspend the HASH processing
      (+) when input are fed to the IP by software
          (++) HAL_HASH_SwFeed_ProcessSuspend()          
      (+) when input are fed to the IP by DMA 
          (++) HAL_HASH_DMAFeed_ProcessSuspend()               
    
 

@endverbatim
  * @{
  */

/**
  * @brief  Return the HASH handle state.
  * @note   The API yields the current state of the handle (BUSY, READY,...). 
  * @param  hhash: HASH handle.
  * @retval HAL HASH state
  */
HAL_HASH_StateTypeDef HAL_HASH_GetState(HASH_HandleTypeDef *hhash)
{
  return hhash->State;
}


/**
  * @brief Return the HASH HAL status.
  * @note  The API yields the HAL status of the handle: it is the result of the
  *        latest HASH processing and allows to report any issue (e.g. HAL_TIMEOUT).   
  * @param  hhash: HASH handle.
  * @retval HAL status
  */                                   
HAL_StatusTypeDef HAL_HASH_GetStatus(HASH_HandleTypeDef *hhash)
{
  return hhash->Status;
}

/**
  * @brief  Save the HASH context in case of processing suspension.
  * @param  hhash: HASH handle.  
  * @param  pMemBuffer: pointer to the memory buffer where the HASH context 
  *         is saved. 
  * @note   The IMR, STR, CR then all the CSR registers are saved
  *         in that order. Only the r/w bits are read to be restored later on.  
  * @note   By default, all the context swap registers (there are 
  *         HASH_NUMBER_OF_CSR_REGISTERS of those) are saved. 
  * @note   pMemBuffer points to a buffer allocated by the user. The buffer size
  *         must be at least (HASH_NUMBER_OF_CSR_REGISTERS + 3) * 4 uint8 long.    
  * @retval None
  */
void HAL_HASH_ContextSaving(HASH_HandleTypeDef *hhash, uint8_t* pMemBuffer)
{
  uint32_t mem_ptr = (uint32_t)pMemBuffer;
  uint32_t csr_ptr = (uint32_t)HASH->CSR;
  uint32_t i = 0;

  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);  
  
  /* Save IMR register content */
  *(uint32_t*)(mem_ptr) = READ_BIT(HASH->IMR,HASH_IT_DINI|HASH_IT_DCI);
  mem_ptr+=4;   
  /* Save STR register content */
  *(uint32_t*)(mem_ptr) = READ_BIT(HASH->STR,HASH_STR_NBLW);
  mem_ptr+=4;
  /* Save CR register content */ 
  *(uint32_t*)(mem_ptr) = READ_BIT(HASH->CR,HASH_CR_DMAE|HASH_CR_DATATYPE|HASH_CR_MODE|HASH_CR_ALGO|HASH_CR_LKEY|HASH_CR_MDMAT);
  mem_ptr+=4;        
  /* By default, save all CSRs registers */
  for (i = HASH_NUMBER_OF_CSR_REGISTERS; i >0; i--)
  {
    *(uint32_t*)(mem_ptr) = *(uint32_t*)(csr_ptr);
    mem_ptr+=4;
    csr_ptr+=4;
  } 
}


/**
  * @brief  Restore the HASH context in case of processing resumption.
  * @param  hhash: HASH handle.  
  * @param  pMemBuffer: pointer to the memory buffer where the HASH context 
  *         is stored. 
  * @note   The IMR, STR, CR then all the CSR registers are restored
  *         in that order. Only the r/w bits are restored.    
  * @note   By default, all the context swap registers (HASH_NUMBER_OF_CSR_REGISTERS
  *         of those) are restored (all of them have been saved by default
  *         beforehand).    
  * @retval None
  */
void HAL_HASH_ContextRestoring(HASH_HandleTypeDef *hhash, uint8_t* pMemBuffer)
{
  uint32_t mem_ptr = (uint32_t)pMemBuffer;
  uint32_t csr_ptr = (uint32_t)HASH->CSR;
  uint32_t i = 0;
  
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hhash);    

  /* Restore IMR register content */
  WRITE_REG(HASH->IMR, (*(uint32_t*)(mem_ptr)));   
  mem_ptr+=4;   
  /* Restore STR register content */
  WRITE_REG(HASH->STR, (*(uint32_t*)(mem_ptr)));     
  mem_ptr+=4;
  /* Restore CR register content */ 
  WRITE_REG(HASH->CR, (*(uint32_t*)(mem_ptr))); 
  mem_ptr+=4;   
  
  /* Reset the HASH processor before restoring the Context
  Swap Registers (CSR) */ 
  __HAL_HASH_INIT();   
        
  /* By default, restore all CSR registers */
  for (i = HASH_NUMBER_OF_CSR_REGISTERS; i >0; i--)
  {
    WRITE_REG((*(uint32_t*)(csr_ptr)), (*(uint32_t*)(mem_ptr)));      
    mem_ptr+=4;
    csr_ptr+=4;
  } 
}


/**
  * @brief  Initiate HASH processing suspension when in polling or interruption mode.
  * @param  hhash: HASH handle.
  * @note   Set the handle field SuspendRequest to the appropriate value so that 
  *         the on-going HASH processing is suspended as soon as the required 
  *         conditions are met. Note that the actual suspension is carried out
  *         by the functions HASH_WriteData() in polling mode and HASH_IT() in
  *         interruption mode.     
  * @retval None
  */
void HAL_HASH_SwFeed_ProcessSuspend(HASH_HandleTypeDef *hhash)
{
  /* Set Handle Suspend Request field */
  hhash->SuspendRequest = HAL_HASH_SUSPEND;
}

/**
  * @brief  Suspend the HASH processing when in DMA mode.
  * @param  hhash: HASH handle.
  * @note   When suspension attempt occurs at the very end of a DMA transfer and 
  *         all the data have already been entered in the IP, hhash->State is 
  *         set to HAL_HASH_STATE_READY and the API returns HAL_ERROR. It is 
  *         recommended to wrap-up the processing in reading the digest as usual. 
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_HASH_DMAFeed_ProcessSuspend(HASH_HandleTypeDef *hhash)
{
  uint32_t tmp_remaining_DMATransferSize_inWords = 0x0;
  uint32_t tmp_initial_DMATransferSize_inWords = 0x0;
  uint32_t tmp_words_already_pushed = 0x0;  
  
  if (hhash->State == HAL_HASH_STATE_READY)
  {
    return HAL_ERROR;
  }
  else
  {  
  
   /* Make sure there is enough time to suspend the processing */
    tmp_remaining_DMATransferSize_inWords = hhash->hdmain->Instance->CNDTR;
    if (tmp_remaining_DMATransferSize_inWords <= HASH_DMA_SUSPENSION_WORDS_LIMIT)
    {
      /* No suspension attempted since almost to the end of the transferred data. */
      /* Best option for user code is to wrap up low priority message hashing     */
      return HAL_ERROR; 
    }

    /* Wait for DMAS to be reset */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, HASH_TIMEOUTVALUE) != HAL_OK)
    {
       return HAL_TIMEOUT;
    }
        
    if (__HAL_HASH_GET_FLAG(HASH_FLAG_DCIS) != RESET)
    {
      return HAL_ERROR;
    }
        
    /* Wait for DMAS to be set */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, RESET, HASH_TIMEOUTVALUE) != HAL_OK)
    {
       return HAL_TIMEOUT;
    }    
    
    /* Disable DMA channel */
    HAL_DMA_Abort(hhash->hdmain);    
    
    /* Clear DMAE bit */
    CLEAR_BIT(HASH->CR,HASH_CR_DMAE);
    
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, HASH_TIMEOUTVALUE) != HAL_OK)
    {
      return HAL_TIMEOUT;
    }
       
    if (__HAL_HASH_GET_FLAG(HASH_FLAG_DCIS) != RESET)
    {
      return HAL_ERROR;
    }        
    
    /* At this point, DMA interface is disabled and no transfer is on-going */
    /* Retrieve from the DMA handle how many words remain to be written */
    tmp_remaining_DMATransferSize_inWords = hhash->hdmain->Instance->CNDTR;

    if (tmp_remaining_DMATransferSize_inWords == 0)
    {
      /* All the DMA transfer is actually done. Suspension occurred at the very end 
         of the transfer. Either the digest computation is about to start (HASH case) 
         or processing is about to move from one step to another (HMAC case).
         In both cases, the processing can't be suspended at this point. It is
         safer to
         - retrieve the low priority block digest before starting the high 
           priority block processing (HASH case)
         - re-attempt a new suspension (HMAC case)  
         */       
      return HAL_ERROR;
    }
    else
    {
  
      /* Compute how many words were supposed to be transferred by DMA */
      tmp_initial_DMATransferSize_inWords = (hhash->HashInCount%4 ?  (hhash->HashInCount+3)/4: hhash->HashInCount/4);
      
      /* If discrepancy between the number of words reported by DMA IP and the numbers of words entered as reported
        by HASH IP, correct it */
      /* tmp_words_already_pushed reflects the number of words that were already pushed before
         the start of DMA transfer (multi-buffer processing case) */
      tmp_words_already_pushed = hhash->NbWordsAlreadyPushed;
      if ((tmp_words_already_pushed + tmp_initial_DMATransferSize_inWords - tmp_remaining_DMATransferSize_inWords) %16  != HASH_NBW_PUSHED())
      {
        tmp_remaining_DMATransferSize_inWords--; /* one less word to be transferred again */ 
      }
     
      /* Accordingly, update the input pointer that points at the next word to be transferred to the IP by DMA */
      hhash->pHashInBuffPtr +=  4 * (tmp_initial_DMATransferSize_inWords - tmp_remaining_DMATransferSize_inWords) ;
      
      /* And store in HashInCount the remaining size to transfer (in bytes) */
      hhash->HashInCount = 4 * tmp_remaining_DMATransferSize_inWords;      
  
    }
  
    /* Set State as suspended */   
    hhash->State = HAL_HASH_STATE_SUSPENDED;    
  
    return HAL_OK;
  
  }
}


/**
  * @}
  */
  
  
/**
  * @}
  */

/** @defgroup HASH_Private_Functions HASH Private Functions
  * @{
  */ 

/**
  * @brief DMA HASH Input Data transfer completion callback. 
  * @param hdma: DMA handle.
  * @note  In case of HMAC processing, HASH_DMAXferCplt() initiates
  *        the next DMA transfer for the following HMAC step.    
  * @retval None
  */
static void HASH_DMAXferCplt(DMA_HandleTypeDef *hdma)
{
  HASH_HandleTypeDef* hhash = ( HASH_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  uint32_t inputaddr = 0x0;
  uint32_t buffersize = 0x0;
  
  if (hhash->State != HAL_HASH_STATE_SUSPENDED)
  {
  
  /* Disable the DMA transfer */
  CLEAR_BIT(HASH->CR, HASH_CR_DMAE);

  if (READ_BIT(HASH->CR, HASH_CR_MODE) == RESET)
  {
    /* If no HMAC processing, input data transfer is now over */
    
    /* Change the HASH state to ready */
    hhash->State = HAL_HASH_STATE_READY;
    
    /* Call Input data transfer complete call back */
    HAL_HASH_InCpltCallback(hhash);
  }
  else
  {
    /* HMAC processing: depending on the current HMAC step and whether or
      not multi-buffer processing is on-going, the next step is initiated
      and MDMAT bit is set.  */
  

    if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_3)
    {
      /* This is the end of HMAC processing */
        
      /* Change the HASH state to ready */
      hhash->State = HAL_HASH_STATE_READY;
    
      /* Call Input data transfer complete call back 
         (note that the last DMA transfer was that of the key 
         for the outer HASH operation). */
      HAL_HASH_InCpltCallback(hhash);        
    
      return;
    }
    else if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_1)
    {
      inputaddr = (uint32_t)hhash->pHashMsgBuffPtr;     /* DMA transfer start address */
      buffersize = hhash->HashBuffSize;                 /* DMA transfer size (in bytes) */
      hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_2;        /* Move phase from Step 1 to Step 2 */
      
      /* In case of suspension request, save the new starting parameters */
      hhash->HashInCount = hhash->HashBuffSize;         /* Initial DMA transfer size (in bytes) */
      hhash->pHashInBuffPtr  = hhash->pHashMsgBuffPtr ; /* DMA transfer start address           */

      hhash->NbWordsAlreadyPushed = 0;                  /* Reset number of words already pushed */
            
      /* Check whether or not digest calculation must be disabled (in case of multi-buffer HMAC processing) */ 
      if (hhash->DigestCalculationDisable != RESET)
      {
        /* Digest calculation is disabled: Step 2 must start with MDMAT bit set, 
           no digest calculation will be triggered at the end of the input buffer feeding to the IP */
        __HAL_HASH_SET_MDMAT();     
      }
    }
    else if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2)
    {
      if (hhash->DigestCalculationDisable != RESET)
      {
        /* No automatic move to Step 3 as a new message buffer will be fed to the IP
           (case of multi-buffer HMAC processing):
           DCAL must not be set.
           Phase remains in Step 2, MDMAT remains set at this point.
           Change the HASH state to ready and call Input data transfer complete call back. */
        hhash->State = HAL_HASH_STATE_READY;
        HAL_HASH_InCpltCallback(hhash);        
        return ; 
      }
      else
      {
        /* Digest calculation is not disabled (case of single buffer input or last buffer
          of multi-buffer HMAC processing) */
        inputaddr = (uint32_t)hhash->Init.pKey;       /* DMA transfer start address */  
        buffersize = hhash->Init.KeySize;             /* DMA transfer size (in bytes) */
        hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_3;    /* Move phase from Step 2 to Step 3 */
        /* In case of suspension request, save the new starting parameters */
        hhash->HashInCount = hhash->Init.KeySize;     /* Initial size for second DMA transfer (input data) */
        hhash->pHashInBuffPtr  = hhash->Init.pKey ;   /* address passed to DMA, now entering data message */  
        
        hhash->NbWordsAlreadyPushed = 0;              /* Reset number of words already pushed */
      }
    }
    /* Configure the Number of valid bits in last word of the message */
    __HAL_HASH_SET_NBVALIDBITS(buffersize);
    
      
      /* Set the HASH DMA transfert completion call back */
      hhash->hdmain->XferCpltCallback = HASH_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 */
    SET_BIT(HASH->CR, HASH_CR_DMAE);
  }
  }

  return;
}

/**
  * @brief DMA HASH communication error callback. 
  * @param hdma: DMA handle.
  * @note  HASH_DMAError() callback invokes HAL_HASH_ErrorCallback() that
  *        can contain user code to manage the error.    
  * @retval None
  */
static void HASH_DMAError(DMA_HandleTypeDef *hdma)
{
  HASH_HandleTypeDef* hhash = ( HASH_HandleTypeDef* )((DMA_HandleTypeDef* )hdma)->Parent;
  
    if (hhash->State != HAL_HASH_STATE_SUSPENDED)
  {
  /* Set HASH state to ready to prevent any blocking issue in user code 
     present in HAL_HASH_ErrorCallback() */
  hhash->State= HAL_HASH_STATE_READY;
  /* Set HASH handle status to error */
  hhash->Status = HAL_ERROR;
  HAL_HASH_ErrorCallback(hhash);
  /* After error handling by code user, reset HASH handle HAL status */
  hhash->Status = HAL_OK;
  
  }  
}

/**
  * @brief  Feed the input buffer to the HASH IP.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to input buffer.
  * @param  Size: the size of input buffer in bytes.
  * @note   HASH_WriteData() regularly reads hhash->SuspendRequest to check whether
  *         or not the HASH processing must be suspended. If this is the case, the
  *         processing is suspended when possible and the IP feeding point reached at
  *         suspension time is stored in the handle for resumption later on.  
  * @retval HAL status
  */
static HAL_StatusTypeDef HASH_WriteData(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size)
{
  uint32_t buffercounter;
  __IO uint32_t inputaddr = (uint32_t) pInBuffer;
  
  for(buffercounter = 0; buffercounter < Size; buffercounter+=4)
  {
    /* Write input data 4 bytes at a time */
    HASH->DIN = *(uint32_t*)inputaddr;
    inputaddr+=4;
    
    /* If the suspension flag has been raised and if the processing is not about
       to end, suspend processing */
    if ((hhash->SuspendRequest == HAL_HASH_SUSPEND) && ((buffercounter+4) < Size))
    {
      /* Wait for DINIS = 1, which occurs when 16 32-bit locations are free 
         in the input buffer */
      if (__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS)) 
      {
        /* Reset SuspendRequest */
        hhash->SuspendRequest = HAL_HASH_SUSPEND_NONE;
      
        /* Depending whether the key or the input data were fed to the IP, the feeding point
           reached at suspension time is not saved in the same handle fields */ 
        if ((hhash->Phase == HAL_HASH_PHASE_PROCESS) || (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2))
        {
          /* Save current reading and writing locations of Input and Output buffers */
          hhash->pHashInBuffPtr =  (uint8_t *)inputaddr;
          /* Save the number of bytes that remain to be processed at this point */
          hhash->HashInCount    =  Size - (buffercounter + 4);
        }
        else if ((hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_1) || (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_3))
        {
          /* Save current reading and writing locations of Input and Output buffers */
          hhash->pHashKeyBuffPtr  =  (uint8_t *)inputaddr;
          /* Save the number of bytes that remain to be processed at this point */
          hhash->HashKeyCount  =  Size - (buffercounter + 4);        
        }
        else
        {
          /* Unexpected phase: unlock process and report error */
          hhash->State = HAL_HASH_STATE_READY;
          __HAL_UNLOCK(hhash);
          return HAL_ERROR;
        }
      
        /* Set the HASH state to Suspended and exit to stop entering data */
        hhash->State = HAL_HASH_STATE_SUSPENDED;
        
        return HAL_OK;
      } /* if (__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS))  */
    } /* if ((hhash->SuspendRequest == HAL_HASH_SUSPEND) && ((buffercounter+4) < Size)) */
  }   /* for(buffercounter = 0; buffercounter < Size; buffercounter+=4)                 */
  
  /* At this point, all the data have been entered to the IP: exit */
  return  HAL_OK; 
}

/**
  * @brief  Retrieve the message digest.
  * @param  pMsgDigest: pointer to the computed digest.
  * @param  Size: message digest size in bytes.
  * @retval None
  */
static void HASH_GetDigest(uint8_t *pMsgDigest, uint8_t Size)
{
  uint32_t msgdigest = (uint32_t)pMsgDigest;
  
  switch(Size)
  {
    /* Read the message digest */
    case 16:  /* MD5 */
      *(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:  /* SHA1 */
      *(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:  /* SHA224 */
    *(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:   /* SHA256 */
    *(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  Handle HASH processing Timeout.
  * @param  hhash: HASH handle.
  * @param  Flag: specifies the HASH flag to check.
  * @param  Status: the Flag status (SET or RESET).
  * @param  Timeout: Timeout duration.
  * @retval HAL status
  */  
static HAL_StatusTypeDef HASH_WaitOnFlagUntilTimeout(HASH_HandleTypeDef *hhash, uint32_t Flag, FlagStatus Status, uint32_t Timeout)
{
  uint32_t tickstart = HAL_GetTick();

  /* Wait until flag is set */
  if(Status == RESET)
  {
    while(__HAL_HASH_GET_FLAG(Flag) == RESET)
    {
      /* Check for the Timeout */
      if(Timeout != HAL_MAX_DELAY)
      {
        if((Timeout == 0) || ((HAL_GetTick()-tickstart) > Timeout))
        {
          /* Set State to Ready to be able to restart later on */
          hhash->State  = HAL_HASH_STATE_READY;
          /* Store time out issue in handle status */
          hhash->Status = HAL_TIMEOUT;

          /* Process Unlocked */
          __HAL_UNLOCK(hhash);

          return HAL_TIMEOUT;
        }
      }
    }
  }
  else
  {
    while(__HAL_HASH_GET_FLAG(Flag) != RESET)
    {
      /* Check for the Timeout */
      if(Timeout != HAL_MAX_DELAY)
      {
        if((Timeout == 0) || ((HAL_GetTick()-tickstart) > Timeout))
        {
          /* Set State to Ready to be able to restart later on */
          hhash->State  = HAL_HASH_STATE_READY;
          /* Store time out issue in handle status */
          hhash->Status = HAL_TIMEOUT;

          /* Process Unlocked */
          __HAL_UNLOCK(hhash);

          return HAL_TIMEOUT;
        }
      }
    }
  }
  return HAL_OK;
}


/**
  * @brief  HASH processing in interruption mode.
  * @param  hhash: HASH handle.
  * @note   HASH_IT() regularly reads hhash->SuspendRequest to check whether
  *         or not the HASH processing must be suspended. If this is the case, the
  *         processing is suspended when possible and the IP feeding point reached at
  *         suspension time is stored in the handle for resumption later on.  
  * @retval HAL status
  */
static HAL_StatusTypeDef HASH_IT(HASH_HandleTypeDef *hhash)
{
  if (hhash->State == HAL_HASH_STATE_BUSY)
  {  
    /* ITCounter must not be equal to 0 at this point. Report an error if this is the case. */
    if(hhash->HashITCounter == 0)
    {
      /* Disable Interrupts */
      __HAL_HASH_DISABLE_IT(HASH_IT_DINI|HASH_IT_DCI);
      /* HASH state set back to Ready to prevent any issue in user code
         present in HAL_HASH_ErrorCallback() */
      hhash->State = HAL_HASH_STATE_READY;        
      return HAL_ERROR;
    }
    else if (hhash->HashITCounter == 1)
    {
     /* This is the first call to HASH_IT, the first input data are about to be 
        entered in the IP. A specific processing is carried out at this point to
        start-up the processing. */ 
      hhash->HashITCounter = 2;
    }
    else
    {
      /* Cruise speed reached, HashITCounter remains equal to 3 until the end of
        the HASH processing or the end of the current step for HMAC processing. */ 
      hhash->HashITCounter = 3;
    }
    
    /* If digest is ready */
    if (__HAL_HASH_GET_FLAG(HASH_FLAG_DCIS))
    {
      /* Read the digest */
      HASH_GetDigest(hhash->pHashOutBuffPtr, HASH_DIGEST_LENGTH());
      
      /* Disable Interrupts */
      __HAL_HASH_DISABLE_IT(HASH_IT_DINI|HASH_IT_DCI);
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_READY;
      /* Call digest computation complete call back */
      HAL_HASH_DgstCpltCallback(hhash);
           
      return HAL_OK;
    }       

    /* If IP ready to accept new data */
    if (__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS))
    { 

      /* If the suspension flag has been raised and if the processing is not about
         to end, suspend processing */
      if ((hhash->SuspendRequest == HAL_HASH_SUSPEND) && (hhash->HashInCount != 0))
      {
        /* Disable Interrupts */
        __HAL_HASH_DISABLE_IT(HASH_IT_DINI|HASH_IT_DCI);
    
        /* Reset SuspendRequest */
        hhash->SuspendRequest = HAL_HASH_SUSPEND_NONE;         
    
        /* Change the HASH state */
        hhash->State = HAL_HASH_STATE_SUSPENDED;
      
        return HAL_OK;
      } 
      
      /* Enter input data in the IP thru HASH_Write_Block_Data() call and
        check whether the digest calculation has been triggered */    
      if (HASH_Write_Block_Data(hhash) == HASH_DIGEST_CALCULATION_STARTED)
      {
        /* Call Input data transfer complete call back 
           (called at the end of each step for HMAC) */
        HAL_HASH_InCpltCallback(hhash);            
        
        if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_1)
        {
          /* Wait until IP is not busy anymore */
          if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, HASH_TIMEOUTVALUE) != HAL_OK)
          {
            /* Disable Interrupts */
            __HAL_HASH_DISABLE_IT(HASH_IT_DINI|HASH_IT_DCI);       
            return HAL_TIMEOUT;
          }            
          /* Initialization start for HMAC STEP 2 */
          hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_2;        /* Move phase from Step 1 to Step 2 */
          __HAL_HASH_SET_NBVALIDBITS(hhash->HashBuffSize);  /* Set NBLW for the input message */
          hhash->HashInCount = hhash->HashBuffSize;         /* Set the input data size (in bytes) */
          hhash->pHashInBuffPtr = hhash->pHashMsgBuffPtr;   /* Set the input data address */
          hhash->HashITCounter = 1;                         /* Set ITCounter to 1 to indicate the start of a new phase */
          __HAL_HASH_ENABLE_IT(HASH_IT_DINI);               /* Enable IT (was disabled in HASH_Write_Block_Data) */
        } 
        else if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2)
        {
          /* Wait until IP is not busy anymore */
          if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, HASH_TIMEOUTVALUE) != HAL_OK)
          {
            /* Disable Interrupts */
            __HAL_HASH_DISABLE_IT(HASH_IT_DINI|HASH_IT_DCI);                                 
            return HAL_TIMEOUT;
          }             
          /* Initialization start for HMAC STEP 3 */
          hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_3;         /* Move phase from Step 2 to Step 3 */                       
          __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);   /* Set NBLW for the key */                         
          hhash->HashInCount = hhash->Init.KeySize;          /* Set the key size (in bytes) */                     
          hhash->pHashInBuffPtr = hhash->Init.pKey;          /* Set the key address */                             
          hhash->HashITCounter = 1;                          /* Set ITCounter to 1 to indicate the start of a new phase */
          __HAL_HASH_ENABLE_IT(HASH_IT_DINI);                /* Enable IT (was disabled in HASH_Write_Block_Data) */      
        }
      } /* if (HASH_Write_Block_Data(hhash) == HASH_DIGEST_CALCULATION_STARTED) */
    }  /* if (__HAL_HASH_GET_FLAG(HASH_FLAG_DINIS))*/

    /* Return function status */
    return HAL_OK;  
  }
  else
  {
    return HAL_BUSY;
  }
}


/**
  * @brief  Write a block of data in HASH IP in interruption mode.
  * @param  hhash: HASH handle.
  * @note   HASH_Write_Block_Data() is called under interruption by HASH_IT().    
  * @retval HAL status
  */
static uint32_t HASH_Write_Block_Data(HASH_HandleTypeDef *hhash)
{
  uint32_t inputaddr;
  uint32_t buffercounter;
  uint32_t inputcounter;    
  uint32_t ret = HASH_DIGEST_CALCULATION_NOT_STARTED;
  
  /* If there are more than 64 bytes remaining to be entered */
  if(hhash->HashInCount > 64)
  {
    inputaddr = (uint32_t)hhash->pHashInBuffPtr;
    /* Write the Input block in the Data IN register
      (16 32-bit words, or 64 bytes are entered) */
    for(buffercounter = 0; buffercounter < 64; buffercounter+=4)
    {
      HASH->DIN = *(uint32_t*)inputaddr;
      inputaddr+=4;
    }
    /* If this is the start of input data entering, an additional word
      must be entered to start up the HASH processing */
    if(hhash->HashITCounter == 2)
    {
      HASH->DIN = *(uint32_t*)inputaddr;
      inputaddr+=4;
      if(hhash->HashInCount >= 68)
      {
        /* There are still data waiting to be entered in the IP.
           Decrement buffer counter and set pointer to the proper
           memory location for the next data entering round. */
        hhash->HashInCount -= 68;
        hhash->pHashInBuffPtr+= 68;
      }
      else
      {
        /* All the input buffer has been fed to the HW. */
        hhash->HashInCount = 0;
      }
    }
    else
    {
      /* 64 bytes have been entered and there are still some remaining:
         Decrement buffer counter and set pointer to the proper
        memory location for the next data entering round.*/
      hhash->HashInCount -= 64;
      hhash->pHashInBuffPtr+= 64;
    }
  }
  else
  {
    /* 64 or less bytes remain to be entered. This is the last
      data entering round. */ 
  
    /* Get the buffer address */
    inputaddr = (uint32_t)hhash->pHashInBuffPtr;
    /* Get the buffer counter */
    inputcounter = hhash->HashInCount;
    /* Disable Interrupts */
    __HAL_HASH_DISABLE_IT(HASH_IT_DINI);

    /* Write the Input block in the Data IN register */
    for(buffercounter = 0; buffercounter < (inputcounter+3)/4; buffercounter++)
    {
      HASH->DIN = *(uint32_t*)inputaddr;
      inputaddr+=4;
    }
    /* Start the Digest calculation */
    __HAL_HASH_START_DIGEST();
    /* Return indication that digest calculation has started:
       this return value triggers the call to Input data transfer 
       complete call back as well as the proper transition from
       one step to another in HMAC mode. */          
    ret = HASH_DIGEST_CALCULATION_STARTED;          
    /* Reset buffer counter */
    hhash->HashInCount = 0;
  }
  
  /* Return whether or digest calculation has started */
  return ret;
}

/**
  * @brief  HMAC processing in polling mode.
  * @param  hhash: HASH handle.
  * @param  Timeout: Timeout value.  
  * @retval HAL status
  */ 
static HAL_StatusTypeDef HMAC_Processing(HASH_HandleTypeDef *hhash, uint32_t Timeout)
{
  /* Ensure first that Phase is correct */
  if ((hhash->Phase != HAL_HASH_PHASE_HMAC_STEP_1) && (hhash->Phase != HAL_HASH_PHASE_HMAC_STEP_2) && (hhash->Phase != HAL_HASH_PHASE_HMAC_STEP_3))
  {
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_READY;
  
    /* Process Unlock */
    __HAL_UNLOCK(hhash);
  
    /* Return function status */
    return HAL_ERROR;
  }
  
  /* HMAC Step 1 processing */
  if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_1)
  {
    /************************** 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 */
    if ((hhash->Status = HASH_WriteData(hhash, hhash->pHashKeyBuffPtr, hhash->HashKeyCount)) != HAL_OK)
    {
      return hhash->Status;
    }
    
    /* Check whether or not key entering process has been suspended */
    if (hhash->State == HAL_HASH_STATE_SUSPENDED)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(hhash);
    
      /* Stop right there and return function status */
      return HAL_OK;
    }   
    
    /* No processing suspension at this point: set DCAL bit. */
    __HAL_HASH_START_DIGEST();
    
    /* Wait for BUSY flag to be cleared */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, Timeout) != HAL_OK)
    {
      return HAL_TIMEOUT;
    }
    
    /* Move from Step 1 to Step 2 */
    hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_2;
     
  }
  
  /* HMAC Step 2 processing.
     After phase check, HMAC_Processing() may 
     - directly start up from this point in resumption case
       if the same Step 2 processing was suspended previously
    - or fall through from the Step 1 processing carried out hereabove */
  if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2)
  {
    /************************** STEP 2 ******************************************/
    /* Configure the Number of valid bits in last word of the message */
    __HAL_HASH_SET_NBVALIDBITS(hhash->HashBuffSize);
    
    /* Write input buffer in Data register */
    if ((hhash->Status = HASH_WriteData(hhash, hhash->pHashInBuffPtr, hhash->HashInCount)) != HAL_OK)
    {
      return hhash->Status;
    }       
    
    /* Check whether or not data entering process has been suspended */
    if (hhash->State == HAL_HASH_STATE_SUSPENDED)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(hhash);
    
      /* Stop right there and return function status */
      return HAL_OK;
    }   
    
    /* No processing suspension at this point: set DCAL bit. */
    __HAL_HASH_START_DIGEST();
    
    /* Wait for BUSY flag to be cleared */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_BUSY, SET, Timeout) != HAL_OK)
    {
      return HAL_TIMEOUT;
    } 
    
    /* Move from Step 2 to Step 3 */ 
    hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_3; 
    /* In case Step 1 phase was suspended then resumed,
       set again Key input buffers and size before moving to
       next step */
    hhash->pHashKeyBuffPtr = hhash->Init.pKey;
    hhash->HashKeyCount    = hhash->Init.KeySize;
  }
         
    
 /* HMAC Step 3 processing.
     After phase check, HMAC_Processing() may 
     - directly start up from this point in resumption case
       if the same Step 3 processing was suspended previously
    - or fall through from the Step 2 processing carried out hereabove */
  if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_3)
  { 
    /************************** 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 */
    if ((hhash->Status = HASH_WriteData(hhash, hhash->pHashKeyBuffPtr, hhash->HashKeyCount)) != HAL_OK)
    {
      return hhash->Status;
    }       
    
    /* Check whether or not key entering process has been suspended */
    if (hhash->State == HAL_HASH_STATE_SUSPENDED)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(hhash);
    
      /* Stop right there and return function status */
      return HAL_OK;
    }   
    
    /* No processing suspension at this point: start the Digest calculation. */
    __HAL_HASH_START_DIGEST();
    
    /* Wait for DCIS flag to be set */
     if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_DCIS, RESET, Timeout) != HAL_OK)
    {
      return HAL_TIMEOUT;
    }  
    
    /* Read the message digest */
    HASH_GetDigest(hhash->pHashOutBuffPtr, HASH_DIGEST_LENGTH());
  }    
  
   /* Change the HASH state */
   hhash->State = HAL_HASH_STATE_READY;
  
   /* Process Unlock */
   __HAL_UNLOCK(hhash);
  
   /* Return function status */
   return HAL_OK;
}


/**
  * @brief  Initialize the HASH peripheral, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest.
  * @param  Timeout: Timeout value. 
  * @param  Algorithm: HASH algorithm.   
  * @retval HAL status
  */
HAL_StatusTypeDef HASH_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout, uint32_t Algorithm)
{
  uint8_t *pInBuffer_tmp;  /* input data address, input parameter of HASH_WriteData()         */
  uint32_t Size_tmp = 0x0; /* input data size (in bytes), input parameter of HASH_WriteData() */

  /* Initiate HASH processing in case of start or resumption */
  if((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))
  {
    /* Check input parameters */
    if ((pInBuffer == NULL) || (Size == 0) || (pOutBuffer == NULL))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }  

  /* Process Locked */
  __HAL_LOCK(hhash);
    
  /* Check if initialization phase has not been already performed */
  if(hhash->Phase == HAL_HASH_PHASE_READY)
  {
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    /* Select the HASH algorithm, clear HMAC mode and long key selection bit, reset the HASH processor core */
    MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_CR_INIT); 
    
    /* Configure the number of valid bits in last word of the message */
    __HAL_HASH_SET_NBVALIDBITS(Size);
    
    /* pInBuffer_tmp and Size_tmp are initialized to be used afterwards as 
       input parameters of HASH_WriteData() */
    pInBuffer_tmp = pInBuffer;   /* pInBuffer_tmp is set to the input data address */
    Size_tmp = Size;             /* Size_tmp contains the input data size in bytes */
    
    /* Set the phase */
    hhash->Phase = HAL_HASH_PHASE_PROCESS;     
  }
  else if (hhash->Phase == HAL_HASH_PHASE_PROCESS) 
  {
    /* if the IP has already been initialized, two cases are possible */
    
    /* Process resumption time ... */
    if (hhash->State == HAL_HASH_STATE_SUSPENDED)
    {
      /* Since this is resumption, pInBuffer_tmp and Size_tmp are not set 
        to the API input parameters but to those saved beforehand by HASH_WriteData()
        when the processing was suspended */
      pInBuffer_tmp = hhash->pHashInBuffPtr;
      Size_tmp = hhash->HashInCount;
    }
    /* ... or multi-buffer HASH processing end */
    else   
    {
      /* pInBuffer_tmp and Size_tmp are initialized to be used afterwards as 
         input parameters of HASH_WriteData() */    
      pInBuffer_tmp = pInBuffer;
      Size_tmp = Size; 
      /* Configure the number of valid bits in last word of the message */ 
      __HAL_HASH_SET_NBVALIDBITS(Size);  
    }
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;     
  }
  else
  {
    /* Phase error */
    hhash->State = HAL_HASH_STATE_READY;
  
    /* Process Unlocked */
    __HAL_UNLOCK(hhash);
  
    /* Return function status */
    return HAL_ERROR;  
  }
  
  
  /* Write input buffer in Data register */
  if ((hhash->Status = HASH_WriteData(hhash, pInBuffer_tmp, Size_tmp)) != HAL_OK)
  {
    return hhash->Status;
  }    
  
  /* If the process has not been suspended, carry on to digest calculation */
  if (hhash->State != HAL_HASH_STATE_SUSPENDED)
  {  
    /* Start the Digest calculation */
    __HAL_HASH_START_DIGEST();
    
    /* Wait for DCIS flag to be set */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_DCIS, RESET, Timeout) != HAL_OK)
    {
      return HAL_TIMEOUT;
    }
  
    /* Read the message digest */
    HASH_GetDigest(pOutBuffer, HASH_DIGEST_LENGTH());
    
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_READY;
    
  }
  
  /* Process Unlocked */
  __HAL_UNLOCK(hhash);
  
  /* Return function status */
  return HAL_OK;
  
  }
  else
  {
    return HAL_BUSY;
  }
}


/**
  * @brief  If not already done, initialize the HASH peripheral then 
  *         processes pInBuffer.
  * @note   Field hhash->Phase of HASH handle is tested to check whether or not
  *         the IP has already been initialized.   
  * @note   The input buffer size (in bytes) must be a multiple of 4 otherwise, the
  *         HASH digest computation is corrupted.       
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes, must be a multiple of 4.
  * @param  Algorithm: HASH algorithm.    
  * @retval HAL status
  */
HAL_StatusTypeDef HASH_Accumulate(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint32_t Algorithm)
{
  uint8_t *pInBuffer_tmp;   /* input data address, input parameter of HASH_WriteData()         */
  uint32_t Size_tmp = 0x0;  /* input data size (in bytes), input parameter of HASH_WriteData() */
  
  /* Make sure the input buffer size (in bytes) is a multiple of 4 */
   assert_param(IS_HASH_POLLING_MULTIBUFFER_SIZE(Size));
  
    
  /* Initiate HASH processing in case of start or resumption */
  if((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))  
  {
    /* Check input parameters */
    if ((pInBuffer == NULL) || (Size == 0))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }   
   
     /* Process Locked */
    __HAL_LOCK(hhash);
    
    /* If resuming the HASH processing */
    if (hhash->State == HAL_HASH_STATE_SUSPENDED)
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY;
    
      /* Since this is resumption, pInBuffer_tmp and Size_tmp are not set 
         to the API input parameters but to those saved beforehand by HASH_WriteData()
         when the processing was suspended */
      pInBuffer_tmp = hhash->pHashInBuffPtr;  /* pInBuffer_tmp is set to the input data address */
      Size_tmp = hhash->HashInCount;          /* Size_tmp contains the input data size in bytes */
      
    }
    else  
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY; 
      
      /* pInBuffer_tmp and Size_tmp are initialized to be used afterwards as 
         input parameters of HASH_WriteData() */   
      pInBuffer_tmp = pInBuffer;    /* pInBuffer_tmp is set to the input data address */ 
      Size_tmp = Size;              /* Size_tmp contains the input data size in bytes */ 
      
      /* Check if initialization phase has already be performed */
      if(hhash->Phase == HAL_HASH_PHASE_READY)
      {
        /* Select the HASH algorithm, clear HMAC mode and long key selection bit, reset the HASH processor core */
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_CR_INIT); 
      }
    
      /* Set the phase */
      hhash->Phase = HAL_HASH_PHASE_PROCESS;
      
    }  
    
    /* Write input buffer in Data register */
    if ((hhash->Status = HASH_WriteData(hhash, pInBuffer_tmp, Size_tmp)) != HAL_OK)
    {
      return hhash->Status;
    }    
    
    /* If the process has not been suspended, move the state to Ready */
    if (hhash->State != HAL_HASH_STATE_SUSPENDED)
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_READY;
    }
    
    /* Process Unlocked */
    __HAL_UNLOCK(hhash);
    
    /* Return function status */
    return HAL_OK; 
    
  }
  else
  {
    return HAL_BUSY;
  }
    
 
}


/**
  * @brief  Initialize the HASH peripheral, next process pInBuffer then
  *         read the computed digest in interruption mode.  
  * @note   Digest is available in pOutBuffer.
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest.
  * @param  Algorithm: HASH algorithm.    
  * @retval HAL status
  */ 
HAL_StatusTypeDef HASH_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Algorithm)
{
    
  /* If State is ready or suspended, start or resume IT-based HASH processing */
  if((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))  
  {
    /* Check input parameters */
    if ((pInBuffer == NULL) || (Size == 0) || (pOutBuffer == NULL))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }
      
    /* Process Locked */
    __HAL_LOCK(hhash);    
      
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    /* Initialize IT counter */
    hhash->HashITCounter = 1;
    
    /* Check if initialization phase has already be performed */
    if(hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Select the HASH algorithm, clear HMAC mode and long key selection bit, reset the HASH processor core */
      MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_CR_INIT); 
      
      /* Configure the number of valid bits in last word of the message */
     __HAL_HASH_SET_NBVALIDBITS(Size);  
     

      hhash->HashInCount = Size;               /* Counter used to keep track of number of data
                                                  to be fed to the IP */ 
      hhash->pHashInBuffPtr = pInBuffer;       /* Points at data which will be fed to the IP at 
                                                  the next interruption */
     /* In case of suspension, hhash->HashInCount and hhash->pHashInBuffPtr contain 
        the information describing where the HASH process is stopped. 
        These variables are used later on to resume the HASH processing at the 
        correct location. */                                                   
                           
      hhash->pHashOutBuffPtr = pOutBuffer;     /* Points at the computed digest */      
    }
    
    /* Set the phase */
    hhash->Phase = HAL_HASH_PHASE_PROCESS;
    
    /* Process Unlock */
    __HAL_UNLOCK(hhash);
    
    /* Enable Interrupts */
    __HAL_HASH_ENABLE_IT(HASH_IT_DINI|HASH_IT_DCI);
    
    /* Return function status */
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }

}


/**
  * @brief  Initialize the HASH peripheral then initiate a DMA transfer
  *         to feed the input buffer to the IP.   
  * @note   If MDMAT bit is set before calling this function (multi-buffer
  *          HASH processing case), the input buffer size (in bytes) must be 
  *          a multiple of 4 otherwise, the HASH digest computation is corrupted.
  *          For the processing of the last buffer of the thread, MDMAT bit must
  *          be reset and the buffer length (in bytes) doesn't have to be a 
  *          multiple of 4.          
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  Algorithm: HASH algorithm.    
  * @retval HAL status
  */ 
HAL_StatusTypeDef HASH_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint32_t Algorithm)
{ 
  uint32_t inputaddr;
  uint32_t inputSize = 0x0;
  
  /* Make sure the input buffer size (in bytes) is a multiple of 4 when MDMAT bit is set 
     (case of multi-buffer HASH processing) */
  assert_param(IS_HASH_DMA_MULTIBUFFER_SIZE(Size));
  
  /* If State is ready or suspended, start or resume DMA-based HASH processing */
  if ((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))
  {
    /* Check input parameters */ 
    if ( (pInBuffer == NULL ) || (Size == 0) ||
    /* Check phase coherency. Phase must be 
       either READY (fresh start)
       or PROCESS (multi-buffer HASH management) */    
       ((hhash->Phase != HAL_HASH_PHASE_READY) && (!(IS_HASH_PROCESSING(hhash)))))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }
    
    
    /* Process Locked */
    __HAL_LOCK(hhash);
    
    /* If not a resumption case */
    if (hhash->State == HAL_HASH_STATE_READY)
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY;      
    
      /* Check if initialization phase has already been performed. 
         If Phase is already set to HAL_HASH_PHASE_PROCESS, this means the
         API is processing a new input data message in case of multi-buffer HASH 
         computation. */
      if(hhash->Phase == HAL_HASH_PHASE_READY)
      {
        /* Select the HASH algorithm, clear HMAC mode and long key selection bit, reset the HASH processor core */
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | 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); 
    
      inputaddr = (uint32_t)pInBuffer;     /* DMA transfer start address   */    
      inputSize = Size;                    /* DMA transfer size (in bytes) */  
      
      /* In case of suspension request, save the starting parameters */
      hhash->pHashInBuffPtr =  pInBuffer;  /* DMA transfer start address   */
      hhash->HashInCount = Size;           /* DMA transfer size (in bytes) */              
      
    }
    /* If resumption case */
    else
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY; 
                
      /* Resumption case, inputaddr and inputSize are not set to the API input parameters 
         but to those saved beforehand by HAL_HASH_DMAFeed_ProcessSuspend() when the 
         processing was suspended */  
      inputaddr = (uint32_t)hhash->pHashInBuffPtr;  /* DMA transfer start address   */  
      inputSize = hhash->HashInCount;               /* DMA transfer size (in bytes) */
      
    }
      
    /* Set the HASH DMA transfert complete callback */
    hhash->hdmain->XferCpltCallback = HASH_DMAXferCplt;
    /* Set the DMA error callback */
    hhash->hdmain->XferErrorCallback = HASH_DMAError;

    /* Store number of words already pushed to manage proper DMA processing suspension */
    hhash->NbWordsAlreadyPushed = HASH_NBW_PUSHED(); 
    
    /* Enable the DMA In DMA Stream */
    HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (inputSize%4 ? (inputSize+3)/4:inputSize/4));
    
    /* Enable DMA requests */
    SET_BIT(HASH->CR, HASH_CR_DMAE);
    
    /* Process Unlock */
    __HAL_UNLOCK(hhash);
    
    /* Return function status */
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }

}

/**
  * @brief  Return the computed digest.
  * @note   The API waits for DCIS to be set then reads the computed digest.  
  * @param  hhash: HASH handle.
  * @param  pOutBuffer: pointer to the computed digest.
  * @param  Timeout: Timeout value.    
  * @retval HAL status
  */
HAL_StatusTypeDef HASH_Finish(HASH_HandleTypeDef *hhash, uint8_t* pOutBuffer, uint32_t Timeout)
{  

  if(hhash->State == HAL_HASH_STATE_READY)
  {
    /* Check parameter */
    if (pOutBuffer == NULL)
    {
      return  HAL_ERROR;
    }
    
    /* Process Locked */
    __HAL_LOCK(hhash);
  
    /* Change the HASH state to busy */
    hhash->State = HAL_HASH_STATE_BUSY;
  
    /* Wait for DCIS flag to be set */
    if (HASH_WaitOnFlagUntilTimeout(hhash, HASH_FLAG_DCIS, RESET, Timeout) != HAL_OK)
    {  
      return HAL_TIMEOUT;
    }
  
    /* Read the message digest */
    HASH_GetDigest(pOutBuffer, HASH_DIGEST_LENGTH());
  
    /* Change the HASH state to ready */
    hhash->State = HAL_HASH_STATE_READY;
  
    /* Process UnLock */
    __HAL_UNLOCK(hhash);
  
    /* Return function status */
    return HAL_OK;
 
  }
  else
  {
    return HAL_BUSY;
  }    
 
}


/**
  * @brief  Initialize the HASH peripheral in HMAC mode, next process pInBuffer then
  *         read the computed digest.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest.
  * @param  Timeout: Timeout value. 
  * @param  Algorithm: HASH algorithm.     
  * @retval HAL status
  */
HAL_StatusTypeDef HMAC_Start(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Timeout, uint32_t Algorithm)
{ 

  /* If State is ready or suspended, start or resume polling-based HASH processing */
  if((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))
  {
    /* Check input parameters */
    if ((pInBuffer == NULL) || (Size == 0) || (hhash->Init.pKey == NULL) || (hhash->Init.KeySize == 0) || (pOutBuffer == NULL))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }

    /* Process Locked */
    __HAL_LOCK(hhash);
      
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    /* Check if initialization phase has already be performed */
    if(hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Check if key size is larger than 64 bytes, accordingly set LKEY and the other setting bits */
      if(hhash->Init.KeySize > 64)
      {
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY | HASH_CR_INIT);      
      }
      else
      {
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_CR_INIT);      
      }
      /* Set the phase to Step 1 */
      hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_1;
      /* Resort to hhash internal fields to feed the IP.
         Parameters will be updated in case of suspension to contain the proper
         information at resumption time. */
      hhash->pHashOutBuffPtr  = pOutBuffer;            /* Output digest address                                              */
      hhash->pHashInBuffPtr   = pInBuffer;             /* Input data address, HMAC_Processing input parameter for Step 2     */
      hhash->HashInCount      = Size;                  /* Input data size, HMAC_Processing input parameter for Step 2        */
      hhash->HashBuffSize     = Size;                  /* Store the input buffer size for the whole HMAC process             */    
      hhash->pHashKeyBuffPtr  = hhash->Init.pKey;      /* Key address, HMAC_Processing input parameter for Step 1 and Step 3 */
      hhash->HashKeyCount     = hhash->Init.KeySize;   /* Key size, HMAC_Processing input parameter for Step 1 and Step 3    */  
    }
    
    /* Carry out HMAC processing */
    return HMAC_Processing(hhash, Timeout);
 
  }
  else
  {
    return HAL_BUSY;
  }  
}



/**
  * @brief  Initialize the HASH peripheral in HMAC mode, next process pInBuffer then
  *         read the computed digest in interruption mode.  
  * @note   Digest is available in pOutBuffer.
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.    
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  pOutBuffer: pointer to the computed digest.
  * @param  Algorithm: HASH algorithm.     
  * @retval HAL status
  */
HAL_StatusTypeDef HMAC_Start_IT(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint8_t* pOutBuffer, uint32_t Algorithm)
{ 
  /* If State is ready or suspended, start or resume IT-based HASH processing */
  if((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))
  {
    /* Check input parameters */
    if ((pInBuffer == NULL) || (Size == 0) || (hhash->Init.pKey == NULL) || (hhash->Init.KeySize == 0) || (pOutBuffer == NULL))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }
      
    /* Process Locked */
    __HAL_LOCK(hhash);
    
    /* Change the HASH state */
    hhash->State = HAL_HASH_STATE_BUSY;
    
    /* Initialize IT counter */
    hhash->HashITCounter = 1;
    
    /* Check if initialization phase has already be performed */
    if (hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Check if key size is larger than 64 bytes, accordingly set LKEY and the other setting bits */
      if(hhash->Init.KeySize > 64)
      {
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY | HASH_CR_INIT);      
      }
      else
      {
        MODIFY_REG(HASH->CR, HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_CR_INIT);      
      }
    
      /* Resort to hhash internal fields hhash->pHashInBuffPtr and hhash->HashInCount
         to feed the IP whatever the HMAC step.
         Lines below are set to start HMAC Step 1 processing where key is entered first. */
      hhash->HashInCount     = hhash->Init.KeySize; /* Key size                      */  
      hhash->pHashInBuffPtr  = hhash->Init.pKey ;   /* Key address                   */ 
      
      /* Store input and output parameters in handle fields to manage steps transition 
         or possible HMAC suspension/resumption */
      hhash->pHashKeyBuffPtr = hhash->Init.pKey;    /* Key address                   */
      hhash->pHashMsgBuffPtr = pInBuffer;           /* Input message address         */
      hhash->HashBuffSize    = Size;                /* Input message size (in bytes) */ 
      hhash->pHashOutBuffPtr = pOutBuffer;          /* Output digest address         */ 
         
      /* Configure the number of valid bits in last word of the key */
      __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
    
      /* Set the phase to Step 1 */
      hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_1;
    }
    else if ((hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_1) || (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_3))
    {
      /* Restart IT-based HASH processing after Step 1 or Step 3 suspension */
    
    }
    else if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2)
    {
      /* Restart IT-based HASH processing after Step 2 suspension */    
    
    }
    else
    {
      /* Error report as phase incorrect */
      /* Process Unlock */
      __HAL_UNLOCK(hhash);
      hhash->State = HAL_HASH_STATE_READY;
      return HAL_ERROR;    
    }
    
    /* Process Unlock */
    __HAL_UNLOCK(hhash);
    
    /* Enable Interrupts */
    __HAL_HASH_ENABLE_IT(HASH_IT_DINI|HASH_IT_DCI);
    
    /* Return function status */
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }

}  



/**
  * @brief  Initialize the HASH peripheral in HMAC mode then initiate the required 
  *         DMA transfers to feed the key and the input buffer to the IP. 
  * @note   Same key is used for the inner and the outer hash functions; pointer to key and 
  *         key size are respectively stored in hhash->Init.pKey and hhash->Init.KeySize.
  * @note   In case of multi-buffer HMAC processing, the input buffer size (in bytes) must 
  *         be a multiple of 4 otherwise, the HASH digest computation is corrupted.
  *         Only the length of the last buffer of the thread doesn't have to be a 
  *         multiple of 4.           
  * @param  hhash: HASH handle.
  * @param  pInBuffer: pointer to the input buffer (buffer to be hashed).
  * @param  Size: length of the input buffer in bytes.
  * @param  Algorithm: HASH algorithm.    
  * @retval HAL status
  */ 
HAL_StatusTypeDef HMAC_Start_DMA(HASH_HandleTypeDef *hhash, uint8_t *pInBuffer, uint32_t Size, uint32_t Algorithm)
{
  uint32_t inputaddr;
  uint32_t inputSize = 0x0;
  
   /* Make sure the input buffer size (in bytes) is a multiple of 4 when digest calculation
      is disabled (multi-buffer HMAC processing, MDMAT bit to be set) */
   assert_param(IS_HMAC_DMA_MULTIBUFFER_SIZE(hhash, Size));
  
  /* If State is ready or suspended, start or resume DMA-based HASH processing */  
  if ((hhash->State == HAL_HASH_STATE_READY) || (hhash->State == HAL_HASH_STATE_SUSPENDED))
  {
    /* Check input parameters */
    if ((pInBuffer == NULL ) || (Size == 0) || (hhash->Init.pKey == NULL ) || (hhash->Init.KeySize == 0) ||
   /* Check phase coherency. Phase must be 
       either READY (fresh start)
       or one of HMAC PROCESS steps (multi-buffer HASH management) */    
       ((hhash->Phase != HAL_HASH_PHASE_READY) && (!(IS_HMAC_PROCESSING(hhash)))))
    {
      hhash->State = HAL_HASH_STATE_READY;
      return  HAL_ERROR;
    }
  
  
    /* Process Locked */
    __HAL_LOCK(hhash);
  
    /* If not a case of resumption after suspension */
    if (hhash->State == HAL_HASH_STATE_READY)
    {
    /* Check whether or not initialization phase has already be performed */
    if(hhash->Phase == HAL_HASH_PHASE_READY)
    {
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY;
  
      /* Check if key size is larger than 64 bytes, accordingly set LKEY and the other setting bits. 
         At the same time, ensure MDMAT bit is cleared. */
      if(hhash->Init.KeySize > 64)
      {
        MODIFY_REG(HASH->CR, HASH_CR_MDMAT|HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_HMAC_KEYTYPE_LONGKEY | HASH_CR_INIT);      
      }
      else
      {
        MODIFY_REG(HASH->CR, HASH_CR_MDMAT|HASH_CR_LKEY|HASH_CR_ALGO|HASH_CR_MODE|HASH_CR_INIT, Algorithm | HASH_ALGOMODE_HMAC | HASH_CR_INIT);      
      }      
      
      /* Store input aparameters in handle fields to manage steps transition 
         or possible HMAC suspension/resumption */
      hhash->HashInCount = hhash->Init.KeySize;   /* Initial size for first DMA transfer (key size)      */
      hhash->pHashKeyBuffPtr = hhash->Init.pKey;  /* Key address                                         */
      hhash->pHashInBuffPtr  = hhash->Init.pKey ; /* First address passed to DMA (key address at Step 1) */
      hhash->pHashMsgBuffPtr = pInBuffer;         /* Input data address                                  */
      hhash->HashBuffSize = Size;                 /* input data size (in bytes)                          */
      
      /* Set DMA input parameters */
      inputaddr = (uint32_t)(hhash->Init.pKey);   /* Address passed to DMA (start by entering Key message) */
      inputSize = hhash->Init.KeySize;            /* Size for first DMA transfer (in bytes) */
 
      /* Configure the number of valid bits in last word of the key */
      __HAL_HASH_SET_NBVALIDBITS(hhash->Init.KeySize);
    
      /* Set the phase to Step 1 */
      hhash->Phase = HAL_HASH_PHASE_HMAC_STEP_1;
      
    }
      else if (hhash->Phase == HAL_HASH_PHASE_HMAC_STEP_2)
    {
      /* Process a new input data message in case of multi-buffer HMAC processing 
        (this is not a resumption case) */
        
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY;

      /* Save input parameters to be able to manage possible suspension/resumption */
        hhash->HashInCount = Size;                /* Input message address       */
        hhash->pHashInBuffPtr = pInBuffer;        /* Input message size in bytes */
      
      /* Set DMA input parameters */
        inputaddr = (uint32_t)pInBuffer;           /* Input message address       */
        inputSize = Size;                          /* Input message size in bytes */
      
      if (hhash->DigestCalculationDisable == RESET)
      {
        /* This means this is the last buffer of the multi-buffer sequence: DCAL needs to be set. */
        __HAL_HASH_RESET_MDMAT();
        __HAL_HASH_SET_NBVALIDBITS(inputSize);
      }    
    }
      else
      {
        /* Phase not aligned with handle READY state */
        __HAL_UNLOCK(hhash);
        /* Return function status */
        return HAL_ERROR;      
      }
    }
    else
    {
       /* Resumption case (phase may be Step 1, 2 or 3) */
       
      /* Change the HASH state */
      hhash->State = HAL_HASH_STATE_BUSY;
          
      /* Set DMA input parameters at resumption location; 
         inputaddr and inputSize are not set to the API input parameters 
         but to those saved beforehand by HAL_HASH_DMAFeed_ProcessSuspend() when the 
         processing was suspended. */       
      inputaddr = (uint32_t)(hhash->pHashInBuffPtr);  /* Input message address       */
      inputSize = hhash->HashInCount;                 /* Input message size in bytes */
    }

  
    /* Set the HASH DMA transfert complete callback */
    hhash->hdmain->XferCpltCallback = HASH_DMAXferCplt;
    /* Set the DMA error callback */
    hhash->hdmain->XferErrorCallback = HASH_DMAError;
    
    /* Store number of words already pushed to manage proper DMA processing suspension */
    hhash->NbWordsAlreadyPushed = HASH_NBW_PUSHED(); 
    
    /* Enable the DMA In DMA Stream */
    HAL_DMA_Start_IT(hhash->hdmain, inputaddr, (uint32_t)&HASH->DIN, (inputSize%4 ? (inputSize+3)/4:inputSize/4));
    /* Enable DMA requests */
    SET_BIT(HASH->CR, HASH_CR_DMAE);
    
    /* Process Unlocked */
    __HAL_UNLOCK(hhash);
    
    /* Return function status */
    return HAL_OK;
  }
  else
  {
    return HAL_BUSY;
  }
}
/**
  * @}
  */
  
/**
  * @}
  */

/**
  * @}
  */

#endif /* defined (STM32L4A6xx) || defined (STM32L4S5xx) || defined (STM32L4S7xx) || defined (STM32L4S9xx) */  

#endif /* HAL_HASH_MODULE_ENABLED */

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