/**
* @brief Decrypt pCypherData in AES CTR decryption mode,
* the decyphered data are available in pPlainData.
* @param hcryp: pointer to a CRYP_HandleTypeDef structure that contains
* the configuration information for CRYP module
* @param pCypherData: Pointer to the cyphertext buffer
* @param Size: Length of the plaintext buffer in bytes, must be a multiple of 16.
* @param pPlainData: Pointer to the plaintext buffer
* @param Timeout: Specify Timeout value
* @note This API is provided only to maintain compatibility with legacy software. Users should directly
* resort to generic HAL_CRYPEx_AES() API instead (usage recommended).
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRYP_AESCTR_Decrypt(CRYP_HandleTypeDef *hcryp, uint8_t *pCypherData, uint16_t Size, uint8_t *pPlainData, uint32_t Timeout)
{
/* Re-initialize AES IP with proper parameters */
if (HAL_CRYP_DeInit(hcryp) != HAL_OK)
{
return HAL_ERROR;
}
hcryp->Init.OperatingMode = CRYP_ALGOMODE_DECRYPT;
hcryp->Init.ChainingMode = CRYP_CHAINMODE_AES_CTR;
hcryp->Init.KeyWriteFlag = CRYP_KEY_WRITE_ENABLE;
if (HAL_CRYP_Init(hcryp) != HAL_OK)
{
return HAL_ERROR;
}
return HAL_CRYPEx_AES(hcryp, pCypherData, Size, pPlainData, Timeout);
}
static int st_hal_cryp_cbc( mbedtls_aes_context *ctx, uint32_t opmode, size_t length,
unsigned char iv[16], uint8_t *input, uint8_t *output)
{
int status = 0;
ctx->hcryp_aes.Init.pInitVect = &iv[0]; // used in process, not in the init
if ((ctx->hcryp_aes.Init.OperatingMode != opmode) || \
(ctx->hcryp_aes.Init.ChainingMode != CRYP_CHAINMODE_AES_CBC) || \
(ctx->hcryp_aes.Init.KeyWriteFlag != CRYP_KEY_WRITE_ENABLE)) {
/* Re-initialize AES IP with proper parameters */
if (HAL_CRYP_DeInit(&ctx->hcryp_aes) != HAL_OK)
return HAL_ERROR;
ctx->hcryp_aes.Init.OperatingMode = opmode;
ctx->hcryp_aes.Init.ChainingMode = CRYP_CHAINMODE_AES_CBC;
ctx->hcryp_aes.Init.KeyWriteFlag = CRYP_KEY_WRITE_ENABLE;
if (HAL_CRYP_Init(&ctx->hcryp_aes) != HAL_OK)
return HAL_ERROR;
}
status = HAL_CRYPEx_AES(&ctx->hcryp_aes, input, length, output, 10);
return status;
}
