in Drivers/STM32U5xx_HAL/Src/stm32u5xx_hal_cryp.c [4190:4480]
static HAL_StatusTypeDef CRYP_AESCCM_Process_IT(CRYP_HandleTypeDef *hcryp)
{
uint32_t count;
uint32_t loopcounter;
uint32_t lastwordsize;
uint32_t npblb;
uint32_t mode;
uint32_t dokeyivconfig = 1U; /* By default, carry out peripheral Key and IV configuration */
#if (USE_HAL_CRYP_SUSPEND_RESUME == 1U)
if ((hcryp->Phase == CRYP_PHASE_HEADER_SUSPENDED) || (hcryp->Phase == CRYP_PHASE_PAYLOAD_SUSPENDED))
{
CRYP_PhaseProcessingResume(hcryp);
return HAL_OK;
}
#endif /* USE_HAL_CRYP_SUSPEND_RESUME */
if (hcryp->Init.KeyIVConfigSkip == CRYP_KEYIVCONFIG_ONCE)
{
if (hcryp->KeyIVConfig == 1U)
{
/* If the Key and IV configuration has to be done only once
and if it has already been done, skip it */
dokeyivconfig = 0U;
hcryp->SizesSum += hcryp->Size; /* Compute message total payload length */
}
else
{
/* If the Key and IV configuration has to be done only once
and if it has not been done already, do it and set KeyIVConfig
to keep track it won't have to be done again next time */
hcryp->KeyIVConfig = 1U;
hcryp->SizesSum = hcryp->Size; /* Merely store payload length */
}
}
else
{
hcryp->SizesSum = hcryp->Size;
}
/* Configure Key, IV and process message (header and payload) */
if (dokeyivconfig == 1U)
{
/* Reset CrypHeaderCount */
hcryp->CrypHeaderCount = 0U;
/********************** Init phase ******************************************/
CRYP_SET_PHASE(hcryp, CRYP_PHASE_INIT);
/* Set the Key */
if (hcryp->Init.KeyMode != CRYP_KEYMODE_SHARED)
{
CRYP_SetKey(hcryp, hcryp->Init.KeySize);
}
else /*after sharing the key, AES should set KMOD[1:0] to 00.*/
{
hcryp->Instance->CR &= ~CRYP_KEYMODE_SHARED;
}
/* Set the initialization vector (IV) with B0 */
hcryp->Instance->IVR3 = *(uint32_t *)(hcryp->Init.B0);
hcryp->Instance->IVR2 = *(uint32_t *)(hcryp->Init.B0 + 1U);
hcryp->Instance->IVR1 = *(uint32_t *)(hcryp->Init.B0 + 2U);
hcryp->Instance->IVR0 = *(uint32_t *)(hcryp->Init.B0 + 3U);
/* Enable the CRYP peripheral */
__HAL_CRYP_ENABLE(hcryp);
/* just wait for hash computation */
count = CRYP_TIMEOUT_GCMCCMINITPHASE;
do
{
count--;
if (count == 0U)
{
/* Disable the CRYP peripheral clock */
__HAL_CRYP_DISABLE(hcryp);
/* Change state */
hcryp->ErrorCode |= HAL_CRYP_ERROR_TIMEOUT;
hcryp->State = HAL_CRYP_STATE_READY;
__HAL_UNLOCK(hcryp);
return HAL_ERROR;
}
} while (HAL_IS_BIT_CLR(hcryp->Instance->SR, AES_SR_CCF));
/* Clear CCF flag */
__HAL_CRYP_CLEAR_FLAG(hcryp, CRYP_CLEAR_CCF);
/***************************** Header phase *********************************/
/* Select header phase */
CRYP_SET_PHASE(hcryp, CRYP_PHASE_HEADER);
/* Enable computation complete flag and error interrupts */
__HAL_CRYP_ENABLE_IT(hcryp, CRYP_IT_CCFIE | CRYP_IT_RWEIE | CRYP_IT_KEIE);
/* Enable the CRYP peripheral */
__HAL_CRYP_ENABLE(hcryp);
if (hcryp->Init.HeaderSize == 0U) /*header phase is skipped*/
{
/* Set the phase */
hcryp->Phase = CRYP_PHASE_PROCESS;
/* Select payload phase once the header phase is performed */
CRYP_SET_PHASE(hcryp, CRYP_PHASE_PAYLOAD);
/* Set to 0 the number of non-valid bytes using NPBLB register*/
MODIFY_REG(hcryp->Instance->CR, AES_CR_NPBLB, 0U);
if (hcryp->Init.Algorithm == CRYP_AES_CCM)
{
/* Increment CrypHeaderCount to pass in CRYP_GCMCCM_SetPayloadPhase_IT */
hcryp->CrypHeaderCount++;
}
/* Write the payload Input block in the IN FIFO */
if (hcryp->Size == 0U)
{
/* Disable interrupts */
__HAL_CRYP_DISABLE_IT(hcryp, CRYP_IT_CCFIE | CRYP_IT_RWEIE | CRYP_IT_KEIE);
/* Change the CRYP state */
hcryp->State = HAL_CRYP_STATE_READY;
__HAL_UNLOCK(hcryp);
}
else if (hcryp->Size >= 16U)
{
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
if ((hcryp->CrypInCount == (hcryp->Size / 4U)) && ((hcryp->Size % 16U) == 0U))
{
/* Call Input transfer complete callback */
#if (USE_HAL_CRYP_REGISTER_CALLBACKS == 1U)
/*Call registered Input complete callback*/
hcryp->InCpltCallback(hcryp);
#else
/*Call legacy weak Input complete callback*/
HAL_CRYP_InCpltCallback(hcryp);
#endif /* USE_HAL_CRYP_REGISTER_CALLBACKS */
}
}
else /* Size < 4 words : first block is the last block*/
{
/* Compute the number of padding bytes in last block of payload */
npblb = 16U - (uint32_t)hcryp->Size;
mode = hcryp->Instance->CR & AES_CR_MODE;
if (((mode == CRYP_OPERATINGMODE_ENCRYPT) && (hcryp->Init.Algorithm == CRYP_AES_GCM_GMAC)) ||
((mode == CRYP_OPERATINGMODE_DECRYPT) && (hcryp->Init.Algorithm == CRYP_AES_CCM)))
{
/* Specify the number of non-valid bytes using NPBLB register*/
MODIFY_REG(hcryp->Instance->CR, AES_CR_NPBLB, npblb << 20U);
}
/* Number of valid words (lastwordsize) in last block */
if ((npblb % 4U) == 0U)
{
lastwordsize = (16U - npblb) / 4U;
}
else
{
lastwordsize = ((16U - npblb) / 4U) + 1U;
}
/* Last block optionally pad the data with zeros*/
for (loopcounter = 0U; loopcounter < lastwordsize; loopcounter++)
{
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
}
while (loopcounter < 4U)
{
/* Pad the data with zeros to have a complete block */
hcryp->Instance->DINR = 0x0U;
loopcounter++;
}
}
}
else if ((hcryp->Init.HeaderSize) < 4U) /*HeaderSize < 4 */
{
/* Last block optionally pad the data with zeros*/
for (loopcounter = 0U; loopcounter < (hcryp->Init.HeaderSize % 4U); loopcounter++)
{
hcryp->Instance->DINR = *(uint32_t *)(hcryp->Init.Header + hcryp->CrypHeaderCount);
hcryp->CrypHeaderCount++;
}
while (loopcounter < 4U)
{
/* pad the data with zeros to have a complete block */
hcryp->Instance->DINR = 0x0U;
loopcounter++;
}
}
else
{
/* Write the input block in the IN FIFO */
hcryp->Instance->DINR = *(uint32_t *)(hcryp->Init.Header + hcryp->CrypHeaderCount);
hcryp->CrypHeaderCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->Init.Header + hcryp->CrypHeaderCount);
hcryp->CrypHeaderCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->Init.Header + hcryp->CrypHeaderCount);
hcryp->CrypHeaderCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->Init.Header + hcryp->CrypHeaderCount);
hcryp->CrypHeaderCount++;
}
} /* end of if (dokeyivconfig == 1U) */
else /* Key and IV have already been configured,
header has already been processed;
only process here message payload */
{
/* Write the payload Input block in the IN FIFO */
if (hcryp->Size == 0U)
{
/* Disable interrupts */
__HAL_CRYP_DISABLE_IT(hcryp, CRYP_IT_CCFIE | CRYP_IT_RWEIE | CRYP_IT_KEIE);
/* Change the CRYP state */
hcryp->State = HAL_CRYP_STATE_READY;
__HAL_UNLOCK(hcryp);
}
else if (hcryp->Size >= 16U)
{
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
if ((hcryp->CrypInCount == (hcryp->Size / 4U)) && ((hcryp->Size % 16U) == 0U))
{
/* Call Input transfer complete callback */
#if (USE_HAL_CRYP_REGISTER_CALLBACKS == 1U)
/*Call registered Input complete callback*/
hcryp->InCpltCallback(hcryp);
#else
/*Call legacy weak Input complete callback*/
HAL_CRYP_InCpltCallback(hcryp);
#endif /* USE_HAL_CRYP_REGISTER_CALLBACKS */
}
}
else /* Size < 4 words : first block is the last block*/
{
/* Compute the number of padding bytes in last block of payload */
npblb = 16U - (uint32_t)hcryp->Size;
mode = hcryp->Instance->CR & AES_CR_MODE;
if (((mode == CRYP_OPERATINGMODE_ENCRYPT) && (hcryp->Init.Algorithm == CRYP_AES_GCM_GMAC)) ||
((mode == CRYP_OPERATINGMODE_DECRYPT) && (hcryp->Init.Algorithm == CRYP_AES_CCM)))
{
/* Specify the number of non-valid bytes using NPBLB register*/
MODIFY_REG(hcryp->Instance->CR, AES_CR_NPBLB, npblb << 20U);
}
/* Number of valid words (lastwordsize) in last block */
if ((npblb % 4U) == 0U)
{
lastwordsize = (16U - npblb) / 4U;
}
else
{
lastwordsize = ((16U - npblb) / 4U) + 1U;
}
/* Last block optionally pad the data with zeros*/
for (loopcounter = 0U; loopcounter < lastwordsize; loopcounter++)
{
hcryp->Instance->DINR = *(uint32_t *)(hcryp->pCrypInBuffPtr + hcryp->CrypInCount);
hcryp->CrypInCount++;
}
while (loopcounter < 4U)
{
/* Pad the data with zeros to have a complete block */
hcryp->Instance->DINR = 0x0U;
loopcounter++;
}
}
}
return HAL_OK;
}