HMAC with DMA transfert

[khaled3310]

Posted on March 09, 2013 at 14:40The original post was too long to process during our migration. Please click on the attachment to read the original post.

[khaled3310]

Posted on March 10, 2013 at 19:33

this is the code but i think that's too long to put it in an interruption

/*************************************************************************************//**  * @brief  Encrypt 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  ************************************************************************************/  void AES128_Encrypt_DMA_CBC(uint8_t* key, uint8_t* InitVectors){  uint32_t keyaddr    = (uint32_t)key        ;  uint32_t ivaddr     = (uint32_t)InitVectors;    CRYP_IVInitTypeDef AES_CRYP_IVInitStructure ;  CRYP_InitTypeDef CRYP_InitStructure         ;  CRYP_KeyInitTypeDef CRYP_KeyInitStructure   ;  CRYP_DeInit();  /* Enable CRYP clock */  RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_CRYP, ENABLE);  /* CRYP configuration********************************************************/  /* Crypto key structure initialisation */   CRYP_KeyStructInit(&CRYP_KeyInitStructure);  CRYP_FIFOFlush();    /* Crypto Init for Encryption process */   CRYP_InitStructure.CRYP_AlgoDir  = CRYP_AlgoDir_Encrypt;  CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_AES_CBC;  CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;  CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_128b;  CRYP_Init(&CRYP_InitStructure);  /* Key Initialisation ********************************************************/  CRYP_KeyInitStructure.CRYP_Key2Left =  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key2Right=  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key3Left =  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key3Right=  __REV(*(uint32_t*)(keyaddr));  CRYP_KeyInit(&CRYP_KeyInitStructure);    /* CRYP Initialization Vectors **********************************************/  AES_CRYP_IVInitStructure.CRYP_IV0Left = __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV0Right= __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV1Left = __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV1Right= __REV(*(uint32_t*)(ivaddr));  CRYP_IVInit(&AES_CRYP_IVInitStructure);    /* Enable Crypto processor **************************************************/  CRYP_FIFOFlush();  CRYP_Cmd(ENABLE);  CRYP_DMACmd(CRYP_DMAReq_DataIN, ENABLE);  CRYP_DMACmd(CRYP_DMAReq_DataOUT, ENABLE);} /***********************  AES128_Decrypt_DMA_Configuration  **************************//*************************************************************************************//**  * @brief  Decrypt 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  ***********************************************************************************/void AES128_Decrypt_DMA_CBC(uint8_t* key, uint8_t* InitVectors){  uint32_t keyaddr    = (uint32_t)key        ;  uint32_t ivaddr     = (uint32_t)InitVectors;    CRYP_IVInitTypeDef AES_CRYP_IVInitStructure;  CRYP_InitTypeDef CRYP_InitStructure;  CRYP_KeyInitTypeDef CRYP_KeyInitStructure;//   CRYP_DeInit();  /* Enable CRYP clock */  RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_CRYP, 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_8b;  CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_128b;  CRYP_Init(&CRYP_InitStructure);  /* Key Initialisation ******************************************************/  CRYP_KeyInitStructure.CRYP_Key2Left =  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key2Right=  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key3Left =  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInitStructure.CRYP_Key3Right=  __REV(*(uint32_t*)(keyaddr));keyaddr+=4;  CRYP_KeyInit(&CRYP_KeyInitStructure);  /* CRYP Initialization Vectors *********************************************/  AES_CRYP_IVInitStructure.CRYP_IV0Left = __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV0Right= __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV1Left = __REV(*(uint32_t*)(ivaddr));ivaddr+=4;  AES_CRYP_IVInitStructure.CRYP_IV1Right= __REV(*(uint32_t*)(ivaddr));  CRYP_IVInit(&AES_CRYP_IVInitStructure);  /* 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_CBC;  CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;  CRYP_InitStructure.CRYP_KeySize  = CRYP_KeySize_128b;  CRYP_Init(&CRYP_InitStructure);  CRYP_Cmd(ENABLE);   /* CRYP Initialization Vectors */  CRYP_DMACmd(CRYP_DMAReq_DataIN, ENABLE);  CRYP_DMACmd(CRYP_DMAReq_DataOUT, ENABLE);  }