/******************************************************************************
* @fn AesLoadKey
*
* @brief Writes the key into the CC2540
*
* input parameters
*
* @param AesKey - Pointer to AES Key.
*
* @return None
*/
void AesLoadKey( uint8 *AesKey )
{
#if (defined HAL_AES_DMA) && (HAL_AES_DMA == TRUE)
halDMADesc_t *ch = HAL_DMA_GET_DESC1234( HAL_DMA_AES_IN );
/* Modify descriptors for channel 1 */
HAL_DMA_SET_SOURCE( ch, AesKey );
HAL_DMA_SET_LEN( ch, KEY_BLENGTH );
/* Arm DMA channel 1 */
HAL_DMA_CLEAR_IRQ( HAL_DMA_AES_IN );
HAL_DMA_ARM_CH( HAL_DMA_AES_IN );
do {
asm("NOP");
} while (!HAL_DMA_CH_ARMED(HAL_DMA_AES_IN));
/* Set AES mode */
AES_SET_ENCR_DECR_KEY_IV( AES_LOAD_KEY );
/* Kick it off, block until AES is ready */
AES_START();
while( !(ENCCS & 0x08) );
#else
/* Set AES mode */
AES_SET_ENCR_DECR_KEY_IV( AES_LOAD_KEY );
/* Load the block */
AesLoadBlock( AesKey );
#endif
}
//-----------------------------------------------------------------------------
// See hal.h for a description of this function.
//-----------------------------------------------------------------------------
void halAesLoadKeyOrInitVector(BYTE* pData, BOOL key){
UINT8 i;
// Checking whether to load a key or an initialisation vector.
if(key){
AES_SET_ENCR_DECR_KEY_IV(AES_LOAD_KEY);
}
else {
AES_SET_ENCR_DECR_KEY_IV(AES_LOAD_IV);
}
// Starting loading of key or vector.
AES_START();
// loading the data (key or vector)
for(i = 0; i < 16; i++){
ENCDI = pData[i];
}
return;
}
/******************************************************************************
* @fn sspAesEncryptHW
*
* @brief Encrypts 16 byte block using AES encryption engine
*
* input parameters
*
* @param AesKey - Pointer to AES Key.
* @param Cstate - Pointer to input data.
*
* output parameters
*
* @param Cstate - Pointer to encrypted data.
*
* @return None
*
*/
void sspAesEncryptHW( uint8 *AesKey, uint8 *Cstate )
{
(void)AesKey;
#if (defined HAL_AES_DMA) && (HAL_AES_DMA == TRUE)
/* Setup DMA for AES encryption */
AesDmaSetup( Cstate, STATE_BLENGTH, Cstate, STATE_BLENGTH );
AES_SET_ENCR_DECR_KEY_IV( AES_ENCRYPT );
/* Kick it off, block until DMA is done */
AES_START();
while( !HAL_DMA_CHECK_IRQ( HAL_DMA_AES_OUT ) );
#else
/* Set ECB mode for AES encryption */
AES_SETMODE(ECB);
AES_SET_ENCR_DECR_KEY_IV( AES_ENCRYPT );
/* Load and start the block */
AesStartBlock( Cstate, Cstate );
#endif
}
