Hi the wiki was useful, but i'm an implementation issue and I can't figure out where is the problem.
I started from example in ...\STM32CubeExpansion_Crypto_V4.0.1\Projects\NUCLEO-G071RB\Applications\Cipher\AES_CBC_EncryptDecrypt\Src
In order to keep main clear, I wrote an Crypto_Inizializzazione() function like this:
cmox_cbc_handle_t Cbc_Ctx;
cmox_cipher_retval_t retval;
const uint8_t Key[] = {'1','2','3','4','5','6','7','8','9','1','2','3','4','5','6','7'};
const uint8_t IV[] = {'1','2','3','4','5','6','7','8','9','1','2','3','4','5','6','7'};
uint8_t Crypto_Inizializzazione(cmox_cipher_handle_t * cipher_ctx ){
/* Initialize cryptographic library */
if (cmox_initialize(NULL) != CMOX_INIT_SUCCESS){
return 1;
}
/* Cleanup the context */
//retval = cmox_cipher_cleanup(cipher_ctx);
//if (retval != CMOX_CIPHER_SUCCESS){
// return 2;
//}
cipher_ctx = cmox_cbc_construct(&Cbc_Ctx, CMOX_AESSMALL_CBC_ENC);
if (cipher_ctx == NULL){
return 3;
}
/* Initialize the cipher context */
retval = cmox_cipher_init(cipher_ctx);
if (retval != CMOX_CIPHER_SUCCESS){
return 4;
}
/* Setup of the encryption key into the context */
retval = cmox_cipher_setKey(cipher_ctx, Key, sizeof(Key)); /* AES key to use */
if (retval != CMOX_CIPHER_SUCCESS){
return 5;
}
/* Setup of the Initialization Vector (IV) into the context */
retval = cmox_cipher_setIV(cipher_ctx, IV, sizeof(IV)); /* Initialization vector */
if (retval != CMOX_CIPHER_SUCCESS){
return 6;
}
return 0;
}
In main I read 16 bytes from SD, encrypt it, and I write encrypted 16 bytes on SD (in another file).
int main(void)
{
/* USER CODE BEGIN 1 */
FATFS StrutturaCtrFS;
FIL File_RD, File_WD; /* File objects */
FRESULT Risultato;
uint8_t Risultato_tmp;
FILINFO fno;
cmox_cipher_handle_t * cryptoHandler;
cmox_cipher_retval_t CRYRisultato;
size_t computed_size;
char NOME_FILE[13], buffer[13];
uint8_t BufferTest_1[16], BufferTest_2[16];
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_SPI2_Init();
MX_ADC1_Init();
MX_USART1_UART_Init();
MX_USART3_UART_Init();
MX_CRC_Init();
MX_FATFS_Init();
/* USER CODE BEGIN 2 */
//Accendo le periferiche
BACKLIGHT_ON();
Risultato_tmp = Crypto_Inizializzazione(cryptoHandler);
if(0 != Risultato_tmp){
while(1);
}
Risultato = f_mount(&StrutturaCtrFS,"",1);
if(FR_OK != Risultato){
while(1);
}
memcpy(NOME_FILE,"Upgrade.bin",12);
Risultato = f_open(&File_RD,NOME_FILE, FA_READ);
if(FR_OK != Risultato){
while(1);
}
memcpy(NOME_FILE,"Upgrade.out",12);
Risultato = f_open(&File_WD,NOME_FILE, FA_CREATE_ALWAYS | FA_WRITE);
if(FR_OK != Risultato){
f_close(&File_RD);
while(1);
}
numBytes = 16;
while(numBytes > 15){
f_read(&File_RD,BufferTest_1, 16, &numBytes);
if(numBytes < 16){
memset(&BufferTest_1[numBytes],0xFF,(16-numBytes));
}
memset(BufferTest_2,0,16);
CRYRisultato = cmox_cipher_append(cryptoHandler,(const uint8_t *)BufferTest_1, (size_t)16,BufferTest_2, &computed_size);
f_write(&File_WD,BufferTest_2, computed_size, &numBytes);
}
f_close(&File_RD);
f_close(&File_WD);
BACKLIGHT_OFF();
while(1);
Init of cypher is ok (return 0), but cmox_cipher_append return code 0x10003 (I thinks is CMOX_CIPHER_ERR_BAD_PARAMETER) and computed_size is 0.
I checked every input parameter (adding also a cast) but I don't fined the issue.
The only questionable point is the cmox_cipher_handle_t * cryptoHandler pointer: I do not make any memory allocation for this pointer. it's correct ? it is the task of the cmox_cbc_construct function ?
Where I can find futher information ?
