stm32f4xx_cryp_des.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_cryp.h"


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define DESBUSY_TIMEOUT    ((uint32_t) 0x00010000)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/


ErrorStatus CRYP_DES_ECB(uint8_t Mode, uint8_t Key[8], uint8_t *Input, 
                         uint32_t Ilength, uint8_t *Output)
{
  CRYP_InitTypeDef DES_CRYP_InitStructure;
  CRYP_KeyInitTypeDef DES_CRYP_KeyInitStructure;
  __IO uint32_t counter = 0;
  uint32_t busystatus = 0;
  ErrorStatus status = SUCCESS;
  uint32_t keyaddr    = (uint32_t)Key;
  uint32_t inputaddr  = (uint32_t)Input;
  uint32_t outputaddr = (uint32_t)Output;
  uint32_t i = 0;

  /* Crypto structures initialisation*/
  CRYP_KeyStructInit(&DES_CRYP_KeyInitStructure);

  /* Crypto Init for Encryption process */
  if( Mode == MODE_ENCRYPT ) /* DES encryption */
  {
     DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;
  }
  else/* if( Mode == MODE_DECRYPT )*/ /* DES decryption */
  {      
     DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Decrypt;
  }

  DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_ECB;
  DES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
  CRYP_Init(&DES_CRYP_InitStructure);

  /* Key Initialisation */
  DES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  DES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
  CRYP_KeyInit(& DES_CRYP_KeyInitStructure);

  /* Flush IN/OUT FIFO */
  CRYP_FIFOFlush();

  /* Enable Crypto processor */
  CRYP_Cmd(ENABLE);

  if(CRYP_GetCmdStatus() == DISABLE)
  {
    /* The CRYP peripheral clock is not enabled or the device doesn't embedd 
       the CRYP peripheral (please check the device sales type. */
    return(ERROR);
  }
  for(i=0; ((i<Ilength) && (status != ERROR)); i+=8)
  {

    /* Write the Input block in the Input FIFO */
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;

/* Wait until the complete message has been processed */
    counter = 0;
    do
    {
      busystatus = CRYP_GetFlagStatus(CRYP_FLAG_BUSY);
      counter++;
    }while ((counter != DESBUSY_TIMEOUT) && (busystatus != RESET));

    if (busystatus != RESET)
   {
       status = ERROR;
    }
    else
    {

      /* Read the Output block from the Output FIFO */
      *(uint32_t*)(outputaddr) = CRYP_DataOut();
      outputaddr+=4;
      *(uint32_t*)(outputaddr) = CRYP_DataOut();
      outputaddr+=4;
    }
  }

  /* Disable Crypto */
  CRYP_Cmd(DISABLE);

  return status; 
}

ErrorStatus CRYP_DES_CBC(uint8_t Mode, uint8_t Key[8], uint8_t InitVectors[8],
                         uint8_t *Input, uint32_t Ilength, uint8_t *Output)
{
  CRYP_InitTypeDef DES_CRYP_InitStructure;
  CRYP_KeyInitTypeDef DES_CRYP_KeyInitStructure;
  CRYP_IVInitTypeDef DES_CRYP_IVInitStructure;
  __IO uint32_t counter = 0;
  uint32_t busystatus = 0;
  ErrorStatus status = SUCCESS;
  uint32_t keyaddr    = (uint32_t)Key;
  uint32_t inputaddr  = (uint32_t)Input;
  uint32_t outputaddr = (uint32_t)Output;
  uint32_t ivaddr     = (uint32_t)InitVectors;
  uint32_t i = 0;

  /* Crypto structures initialisation*/
  CRYP_KeyStructInit(&DES_CRYP_KeyInitStructure);

  /* Crypto Init for Encryption process */
  if(Mode == MODE_ENCRYPT) /* DES encryption */
  {
     DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;
  }
  else /*if(Mode == MODE_DECRYPT)*/ /* DES decryption */
  {
     DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Decrypt;
  }

  DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_CBC;
  DES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
  CRYP_Init(&DES_CRYP_InitStructure);

  /* Key Initialisation */
  DES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  DES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
  CRYP_KeyInit(& DES_CRYP_KeyInitStructure);

  /* Initialization Vectors */
  DES_CRYP_IVInitStructure.CRYP_IV0Left = __REV(*(uint32_t*)(ivaddr));
  ivaddr+=4;
  DES_CRYP_IVInitStructure.CRYP_IV0Right= __REV(*(uint32_t*)(ivaddr));
  CRYP_IVInit(&DES_CRYP_IVInitStructure);

  /* Flush IN/OUT FIFO */
  CRYP_FIFOFlush();
  
  /* Enable Crypto processor */
  CRYP_Cmd(ENABLE);

  if(CRYP_GetCmdStatus() == DISABLE)
  {
    /* The CRYP peripheral clock is not enabled or the device doesn't embedd 
       the CRYP peripheral (please check the device sales type. */
    return(ERROR);
  }
  for(i=0; ((i<Ilength) && (status != ERROR)); i+=8)
  {
    /* Write the Input block in the Input FIFO */
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;

    /* Wait until the complete message has been processed */
    counter = 0;
    do
    {
      busystatus = CRYP_GetFlagStatus(CRYP_FLAG_BUSY);
      counter++;
    }while ((counter != DESBUSY_TIMEOUT) && (busystatus != RESET));

    if (busystatus != RESET)
   {
       status = ERROR;
    }
    else
    {
      /* Read the Output block from the Output FIFO */
      *(uint32_t*)(outputaddr) = CRYP_DataOut();
      outputaddr+=4;
      *(uint32_t*)(outputaddr) = CRYP_DataOut();
      outputaddr+=4;
    }
  }

  /* Disable Crypto */
  CRYP_Cmd(DISABLE);

  return status; 
}

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