STM32CubeF7/Projects/STM32756G_EVAL/Examples/HASH/HASH_HMAC_SHA1MD5

/**
  @page HASH_HMAC_SHA1MD5  HMAC digest calculation using HMAC SHA1 and HMAC MD5 example
  
  @verbatim
  ******************************************************************************
  * @file    HASH/HASH_HMAC_SHA1MD5/readme.txt
  * @author  MCD Application Team
  * @brief   Description of the digest calculation using HMAC SHA1 and HMAC MD5 Example.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  @endverbatim

@par Example Description 

How to use the HASH peripheral to hash data with SHA224 and SHA256 algorithms.

For this example, DMA is not used for data transfer. In fact, the CPU is used in
polling mode.

The key used is long type (2088 bit = 261 bytes).
The HMAC SHA-1 message digest result is a 160 bit (20 bytes) data and the HMAC MD5 message 
digest result is a 128 bit (16 bytes) data.

The expected HASH digests (for SHA1 and MD5) are already computed using an online
HASH tool. Those values are compared to those computed by the HASH peripheral.
In case there is a mismatch the red LED is turned ON.
In case the SHA1 digest is computed correctly the green LED (LED1) is turned ON.
In case the MD5 digest is computed correctly the blue LED (LED4) is turned ON.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.

@par Keywords

System, Security, HASH, HMAC, SHA1, MD5, DMA, digest, 

@Note<74>If the user code size exceeds the DTCM-RAM size or starts from internal cacheable memories (SRAM1 and SRAM2),that is shared between several processors,
 <20><><A0><A0><A0>then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
<0A><><A0><A0><A0><A0>The address and the size of cacheable buffers (shared between CPU and other masters)  must be properly updated to be aligned to cache line size (32 bytes).

@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
<0A><><A0><A0><A0> It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
<0A><><A0><A0><A0><A0>In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
<0A><><A0><A0><A0><A0>Even though the user must manage the cache coherence for read accesses.
<0A><><A0><A0><A0><A0>Please refer to the AN4838 <20>Managing memory protection unit (MPU) in STM32 MCUs<55>
<0A><><A0><A0><A0><A0>Please refer to the AN4839 <20>Level 1 cache on STM32F7 Series<65>

@par Directory contents

  - HASH/HASH_HMAC_SHA1MD5/Inc/stm32f7xx_hal_conf.h    HAL configuration file
  - HASH/HASH_HMAC_SHA1MD5/Inc/stm32f7xx_it.h          Interrupt handlers header file
  - HASH/HASH_HMAC_SHA1MD5/Inc/main.h						 Header for main.c module  
  - HASH/HASH_HMAC_SHA1MD5/Src/stm32f7xx_it.c          Interrupt handlers
  - HASH/HASH_HMAC_SHA1MD5/Src/main.c						 Main program
  - HASH/HASH_HMAC_SHA1MD5/Src/stm32f7xx_hal_msp.c     HAL MSP module
  - HASH/HASH_HMAC_SHA1MD5/Src/system_stm32f7xx.c      STM32F7xx system source file


@par Hardware and Software environment

  - This example runs on STM32F756xx devices.
  
  - This example has been tested with STM32756G-EVAL board revB and can be
    easily tailored to any other supported device and development board.
    
  - STM32756G-EVAL Set-up :
    - To use LED1, ensure that JP24 is in position 2-3
    - To use LED3, ensure that JP23 is in position 2-3

@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example 



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