Ejemplo n.º 1
0
int wc_Stm32_Aes_Init(Aes* aes, CRYP_InitTypeDef* cryptInit,
    CRYP_KeyInitTypeDef* keyInit)
{
    int ret;
    word32 keySize;
    word32* aes_key;

    ret = wc_AesGetKeySize(aes, &keySize);
    if (ret != 0)
        return ret;

    aes_key = aes->key;

    /* crypto structure initialization */
    CRYP_KeyStructInit(keyInit);
    CRYP_StructInit(cryptInit);

    /* load key into correct registers */
    switch (keySize) {
        case 16: /* 128-bit key */
            cryptInit->CRYP_KeySize = CRYP_KeySize_128b;
            keyInit->CRYP_Key2Left  = aes_key[0];
            keyInit->CRYP_Key2Right = aes_key[1];
            keyInit->CRYP_Key3Left  = aes_key[2];
            keyInit->CRYP_Key3Right = aes_key[3];
            break;

        case 24: /* 192-bit key */
            cryptInit->CRYP_KeySize = CRYP_KeySize_192b;
            keyInit->CRYP_Key1Left  = aes_key[0];
            keyInit->CRYP_Key1Right = aes_key[1];
            keyInit->CRYP_Key2Left  = aes_key[2];
            keyInit->CRYP_Key2Right = aes_key[3];
            keyInit->CRYP_Key3Left  = aes_key[4];
            keyInit->CRYP_Key3Right = aes_key[5];
            break;

        case 32: /* 256-bit key */
            cryptInit->CRYP_KeySize = CRYP_KeySize_256b;
            keyInit->CRYP_Key0Left  = aes_key[0];
            keyInit->CRYP_Key0Right = aes_key[1];
            keyInit->CRYP_Key1Left  = aes_key[2];
            keyInit->CRYP_Key1Right = aes_key[3];
            keyInit->CRYP_Key2Left  = aes_key[4];
            keyInit->CRYP_Key2Right = aes_key[5];
            keyInit->CRYP_Key3Left  = aes_key[6];
            keyInit->CRYP_Key3Right = aes_key[7];
            break;

        default:
            break;
    }
    cryptInit->CRYP_DataType = CRYP_DataType_8b;

    return 0;
}
Ejemplo n.º 2
0
/**
  * @brief  Encrypts Data using AES 
  * @note   DATA transfer is done by the DMA
  * @note   DMA2 stream6 channel2 is used to transfer data from memory (the 
  *         PlainData Table) to CRYP Peripheral (the INPUT data register). 
  * @note   DMA2 stream5 channel2 is used to transfer data from CRYP Peripheral
  *        (the OUTPUT data register to memory (the EncryptedData Table). 
  * @param  None
  * @retval None
  */
static void AES128_Encrypt_DMA(void)
{
  CRYP_InitTypeDef CRYP_InitStructure;
  CRYP_KeyInitTypeDef CRYP_KeyInitStructure;
  DMA_InitTypeDef DMA_InitStructure;
 
  /* Enable CRYP clock */
  RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_CRYP, ENABLE);

  /* Enable DMA2 clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
 
  /* CRYP configuration********************************************************/
  /* Crypto key structure initialisation */ 
  CRYP_KeyStructInit(&CRYP_KeyInitStructure);
  
  /* Crypto Init for Encryption process */      
  CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;
  CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_AES_ECB;
  CRYP_InitStructure.CRYP_DataType = CRYP_DataType_32b;
  CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_128b;
  CRYP_Init(&CRYP_InitStructure);

  /* Key Initialisation */
  CRYP_KeyInitStructure.CRYP_Key2Left = AES128key[0];
  CRYP_KeyInitStructure.CRYP_Key2Right= AES128key[1];
  CRYP_KeyInitStructure.CRYP_Key3Left = AES128key[2];
  CRYP_KeyInitStructure.CRYP_Key3Right= AES128key[3];
  CRYP_KeyInit(&CRYP_KeyInitStructure);

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

  CRYP_DMACmd(CRYP_DMAReq_DataIN, ENABLE);
  CRYP_DMACmd(CRYP_DMAReq_DataOUT, ENABLE);
  
  /* DMA Configuration ********************************************************/
  DMA_DeInit(DMA2_Stream5);
  DMA_DeInit(DMA2_Stream6);
  /* set common DMA parameters for Stream 5 and 6*/  
  DMA_InitStructure.DMA_Channel = DMA_Channel_2;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;  
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_BufferSize = DATA_SIZE;

  /* Set the parameters to be configured for stream 6 */
  DMA_InitStructure.DMA_PeripheralBaseAddr = CRYP_DIN_REG_ADDR; 
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)PlainData;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;

  /* Configure the DMA Stream 6 */
  DMA_Init(DMA2_Stream6, &DMA_InitStructure);

  /* Set the parameters to be configured for stream 5 */
  DMA_InitStructure.DMA_PeripheralBaseAddr = CRYP_DOUT_REG_ADDR;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)EncryptedData;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

  /* Configure the DMA Stream 5 */
  DMA_Init(DMA2_Stream5, &DMA_InitStructure);

  /* Enable DMA streams *******************************************************/
  DMA_Cmd(DMA2_Stream6, ENABLE);
  DMA_Cmd(DMA2_Stream5, ENABLE);
  
  /* Wait until the last transfer from OUT FIFO :
     all encrypted Data are transferred from crypt processor */
  while (DMA_GetFlagStatus(DMA2_Stream6, DMA_FLAG_TCIF5) == RESET);

  /* Disable Crypto and DMA ***************************************************/
  CRYP_Cmd(DISABLE);
  CRYP_DMACmd(CRYP_DMAReq_DataIN, DISABLE);
  CRYP_DMACmd(CRYP_DMAReq_DataOUT, DISABLE);
  DMA_Cmd(DMA2_Stream5, DISABLE);
  DMA_Cmd(DMA2_Stream6, DISABLE); 
}
Ejemplo n.º 3
0
/**
  * @brief  Encrypt and decrypt using TDES in ECB Mode
  * @param  Mode: encryption or decryption Mode.
  *           This parameter can be one of the following values:
  *            @arg MODE_ENCRYPT: Encryption
  *            @arg MODE_DECRYPT: Decryption
  * @param  Key: Key used for TDES algorithm.
  * @param  Ilength: length of the Input buffer, must be a multiple of 8.
  * @param  Input: pointer to the Input buffer.
  * @param  Output: pointer to the returned buffer.
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: Operation done
  *          - ERROR: Operation failed
  */
ErrorStatus CRYP_TDES_ECB(uint8_t Mode, uint8_t Key[24], uint8_t *Input, 
                          uint32_t Ilength, uint8_t *Output)
{
  CRYP_InitTypeDef TDES_CRYP_InitStructure;
  CRYP_KeyInitTypeDef TDES_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(&TDES_CRYP_KeyInitStructure);

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

  TDES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_TDES_ECB;
  TDES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
  CRYP_Init(&TDES_CRYP_InitStructure);

  /* Key Initialisation */
  TDES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  TDES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  TDES_CRYP_KeyInitStructure.CRYP_Key2Left = __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  TDES_CRYP_KeyInitStructure.CRYP_Key2Right= __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  TDES_CRYP_KeyInitStructure.CRYP_Key3Left = __REV(*(uint32_t*)(keyaddr));
  keyaddr+=4;
  TDES_CRYP_KeyInitStructure.CRYP_Key3Right= __REV(*(uint32_t*)(keyaddr));
  CRYP_KeyInit(& TDES_CRYP_KeyInitStructure);

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

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

  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 != TDESBUSY_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; 
}
/**
  * @brief  Encrypt and decrypt using DES in CBC Mode
  * @param  Mode: encryption or decryption Mode.
  *          This parameter can be one of the following values:
  *            @arg MODE_ENCRYPT: Encryption
  *            @arg MODE_DECRYPT: Decryption
  * @param  Key: Key used for DES algorithm.
  * @param  InitVectors: Initialisation Vectors used for DES algorithm.
  * @param  Ilength: length of the Input buffer, must be a multiple of 8.
  * @param  Input: pointer to the Input buffer.
  * @param  Output: pointer to the returned buffer.
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: Operation done
  *          - ERROR: Operation failed
  */
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; 
}
Ejemplo n.º 5
0
/**
  * @brief  Encrypt and decrypt using AES in ECB Mode
  * @param  Mode: encryption or decryption Mode.
  *          This parameter can be one of the following values:
  *            @arg MODE_ENCRYPT: Encryption
  *            @arg MODE_DECRYPT: Decryption
  * @param  Key: Key used for AES algorithm.
  * @param  Keysize: length of the Key, must be a 128, 192 or 256.
  * @param  Input: pointer to the Input buffer.
  * @param  Ilength: length of the Input buffer, must be a multiple of 16.
  * @param  Output: pointer to the returned buffer.
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: Operation done
  *          - ERROR  : Operation failed
  */
ErrorStatus CRYP_AES_ECB(uint8_t Mode, uint8_t* Key, uint16_t Keysize,
                         uint8_t* Input, uint32_t Ilength, uint8_t* Output)
{
  CRYP_InitTypeDef AES_CRYP_InitStructure;
  CRYP_KeyInitTypeDef AES_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(&AES_CRYP_KeyInitStructure);

  switch(Keysize)
  {
    case 128:
    AES_CRYP_InitStructure.CRYP_KeySize = CRYP_KeySize_128b;
    AES_CRYP_KeyInitStructure.CRYP_Key2Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key2Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Right= __REV(*(uint32_t*)(keyaddr));
    break;
    case 192:
    AES_CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_192b;
    AES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key2Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key2Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Right= __REV(*(uint32_t*)(keyaddr));
    break;
    case 256:
    AES_CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_256b;
    AES_CRYP_KeyInitStructure.CRYP_Key0Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key0Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key2Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key2Right= __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Left = __REV(*(uint32_t*)(keyaddr));
    keyaddr+=4;
    AES_CRYP_KeyInitStructure.CRYP_Key3Right= __REV(*(uint32_t*)(keyaddr));
    break;
    default:
    break;
  }

  /*------------------ AES Decryption ------------------*/
  if(Mode == MODE_DECRYPT) /* AES decryption */
  {
    /* Flush IN/OUT FIFOs */
    CRYP_FIFOFlush();

    /* Crypto Init for Key preparation for decryption process */
    AES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
    AES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_AES_Key;
    AES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_32b;
    CRYP_Init(&AES_CRYP_InitStructure);

    /* Key Initialisation */
    CRYP_KeyInit(&AES_CRYP_KeyInitStructure);

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

    /* wait until the Busy flag is RESET */
    do
    {
      busystatus = CRYP_GetFlagStatus(CRYP_FLAG_BUSY);
      counter++;
    }while ((counter != AESBUSY_TIMEOUT) && (busystatus != RESET));

    if (busystatus != RESET)
   {
       status = ERROR;
    }
    else
    {
      /* Crypto Init for decryption process */  
      AES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
    }
  }
  /*------------------ AES Encryption ------------------*/
  else /* AES encryption */
  {

    CRYP_KeyInit(&AES_CRYP_KeyInitStructure);

    /* Crypto Init for Encryption process */
    AES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;
  }

  AES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_AES_ECB;
  AES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
  CRYP_Init(&AES_CRYP_InitStructure);

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

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

  for(i=0; ((i<Ilength) && (status != ERROR)); i+=16)
  {

    /* Write the Input block in the IN FIFO */
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;
    CRYP_DataIn(*(uint32_t*)(inputaddr));
    inputaddr+=4;
    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 != AESBUSY_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;
      *(uint32_t*)(outputaddr) = CRYP_DataOut();
      outputaddr+=4;
      *(uint32_t*)(outputaddr) = CRYP_DataOut(); 
      outputaddr+=4;
    }
  }

  /* Disable Crypto */
  CRYP_Cmd(DISABLE);

  return status; 
}
Ejemplo n.º 6
0
    void DesCrypt(Des* des, byte* out, const byte* in, word32 sz,
                  int dir, int mode)
    {
        word32 *dkey, *iv;
        CRYP_InitTypeDef DES_CRYP_InitStructure;
        CRYP_KeyInitTypeDef DES_CRYP_KeyInitStructure;
        CRYP_IVInitTypeDef DES_CRYP_IVInitStructure;

        dkey = des->key;
        iv = des->reg;

        /* crypto structure initialization */
        CRYP_KeyStructInit(&DES_CRYP_KeyInitStructure);
        CRYP_StructInit(&DES_CRYP_InitStructure);
        CRYP_IVStructInit(&DES_CRYP_IVInitStructure);

        /* reset registers to their default values */
        CRYP_DeInit();

        /* set direction, mode, and datatype */
        if (dir == DES_ENCRYPTION) {
            DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;
        } else { /* DES_DECRYPTION */
            DES_CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Decrypt;
        }

        if (mode == DES_CBC) {
            DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_CBC;
        } else { /* DES_ECB */
            DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_ECB;
        }

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

        /* load key into correct registers */
        DES_CRYP_KeyInitStructure.CRYP_Key1Left  = dkey[0];
        DES_CRYP_KeyInitStructure.CRYP_Key1Right = dkey[1];
        CRYP_KeyInit(&DES_CRYP_KeyInitStructure);

        /* set iv */
        ByteReverseWords(iv, iv, DES_BLOCK_SIZE);
        DES_CRYP_IVInitStructure.CRYP_IV0Left  = iv[0];
        DES_CRYP_IVInitStructure.CRYP_IV0Right = iv[1];
        CRYP_IVInit(&DES_CRYP_IVInitStructure);

        /* enable crypto processor */
        CRYP_Cmd(ENABLE);

        while (sz > 0)
        {
            /* flush IN/OUT FIFOs */
            CRYP_FIFOFlush();

            /* if input and output same will overwrite input iv */
            XMEMCPY(des->tmp, in + sz - DES_BLOCK_SIZE, DES_BLOCK_SIZE);

            CRYP_DataIn(*(uint32_t*)&in[0]);
            CRYP_DataIn(*(uint32_t*)&in[4]);

            /* wait until the complete message has been processed */
            while(CRYP_GetFlagStatus(CRYP_FLAG_BUSY) != RESET) {}

            *(uint32_t*)&out[0]  = CRYP_DataOut();
            *(uint32_t*)&out[4]  = CRYP_DataOut();

            /* store iv for next call */
            XMEMCPY(des->reg, des->tmp, DES_BLOCK_SIZE);

            sz  -= DES_BLOCK_SIZE;
            in  += DES_BLOCK_SIZE;
            out += DES_BLOCK_SIZE;
        }

        /* disable crypto processor */
        CRYP_Cmd(DISABLE);
    }