/**
* @brief Decrypts Data using AES
* @note DATA transfer is done by DMA
* @note DMA2 stream6 channel2 is used to transfer data from memory (the
* EncryptedData 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 DecryptedData Table).
* @param None
* @retval None
*/
static void AES128_Decrypt_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 Init for Key preparation for Decryption process */
CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_AES_Key;
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);
/* wait until the Busy flag is reset */
while (CRYP_GetFlagStatus(CRYP_FLAG_BUSY) != RESET);
/* Crypto Init for Decryption process */
CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
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);
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_INC4;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_INC4;
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)EncryptedData;
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)DecryptedData;
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);
DMA_ClearFlag(DMA2_Stream6, DMA_FLAG_TCIF5);
}
/**
* @brief Encrypt Data using TDES
* @note DATA transfer is done by DMA
* @note DMA2 stream6 channel2 is used to transfer data from memory (the
* PlainData Tab) 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 Tab).
* @param None
* @retval None
*/
void TDES_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);
/* Configure crypto as encoder TDES *****************************************/
/* Crypto Init for Encryption process */
CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Encrypt;
CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_TDES_ECB;
CRYP_InitStructure.CRYP_DataType = CRYP_DataType_32b;
CRYP_FIFOFlush();
CRYP_Init(&CRYP_InitStructure);
/* Key Initialisation */
CRYP_KeyInitStructure.CRYP_Key1Left = TDESkey[0];
CRYP_KeyInitStructure.CRYP_Key1Right= TDESkey[1];
CRYP_KeyInitStructure.CRYP_Key2Left = TDESkey[2];
CRYP_KeyInitStructure.CRYP_Key2Right= TDESkey[3];
CRYP_KeyInitStructure.CRYP_Key3Left = TDESkey[4];
CRYP_KeyInitStructure.CRYP_Key3Right= TDESkey[5];
CRYP_KeyInit(&CRYP_KeyInitStructure);
CRYP_DMACmd(CRYP_DMAReq_DataOUT, ENABLE);
CRYP_DMACmd(CRYP_DMAReq_DataIN, ENABLE);
/* DMA Configuration*********************************************************/
/* set commun DMA parameters for Stream 5 and 6*/
DMA_DeInit(DMA2_Stream5);
DMA_DeInit(DMA2_Stream6);
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_Enable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
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 specific to 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 specific to 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);
/* Enable Crypto processor */
CRYP_Cmd(ENABLE);
/* wait until the last transfer from OUT FIFO :
all encrypted Data are transfered from crypt processor */
while (DMA_GetFlagStatus(DMA2_Stream5, DMA_FLAG_TCIF5) == RESET);
/* Disable Crypto and DMA ***************************************************/
CRYP_Cmd(DISABLE);
CRYP_DMACmd(CRYP_DMAReq_DataOUT, DISABLE);
CRYP_DMACmd(CRYP_DMAReq_DataIN, DISABLE);
DMA_Cmd(DMA2_Stream5, DISABLE);
DMA_Cmd(DMA2_Stream6, DISABLE);
}
