STM32CubeF4

@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file HASH/HASH_SHA224SHA256_DMA/readme.txt
* @author MCD Application Team
* @brief Description of the digest calculation using SHA224 and SHA256 Example.
******************************************************************************
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@endverbatim

@par Example Description

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

In this example, DMA is used to transfer data from internal RAM to HASH peripheral.
The SHA224 message digest length is a 28 bytes and the SHA256 message digest length
is 32 bytes.

The expected HASH digests (for SHA224 and SHA256) 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 SHA224 digest is computed correctly the green LED (LED1) is turned ON.
In case the SHA256 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 needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.

@par Keywords

System, Security, HASH, SHA256, SHA224, digest, DMA

@par Directory contents

- HASH/HASH_SHA224SHA256_DMA/Inc/stm32f4xx_hal_conf.h HAL configuration file
- HASH/HASH_SHA224SHA256_DMA/Inc/stm32f4xx_it.h Interrupt handlers header file
- HASH/HASH_SHA224SHA256_DMA/Inc/main.h Main program header file
- HASH/HASH_SHA224SHA256_DMA/Src/stm32f4xx_it.c Interrupt handlers
- HASH/HASH_SHA224SHA256_DMA/Src/main.c Main program
- HASH/HASH_SHA224SHA256_DMA/Src/stm32f4xx_hal_msp.c HAL MSP module
- HASH/HASH_SHA224SHA256_DMA/Src/system_stm32f4xx.c STM32F4xx system clock configuration file

@par Hardware and Software environment

- This example runs on STM32F439xx devices.

- This example has been tested with STMicroelectronics STM32439I-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.

@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