AN3270

AES block processing

Doc ID 17919 Rev 2

19/23

/* Pad the buffer with defined pad character */

while(counter < (nbrblocks + 1) * 16)

{

pText[counter] = PAD_CHARACTER;

counter++;

}

Another buffer is created dynamically to store the result of encryption or decryption

(depending on the user selection)

if (CryptoMode == CRYPTO_MODE_ENCRYPTION)

{

/* Pad the received buffer */

BufferInit(RxBuffer, &TextSize);

/* PlainText points at the received buffer */

PlainText = RxBuffer;

/* Allocate memory space */

CipherText = (uint8_t*) malloc(TextSize);

......

......

else

{

/* Pad the received buffer */

BufferInit(RxBuffer, &TextSize);

/* CipherText points at the received buffer */

CipherText = RxBuffer1;

/* Allocate memory space */

PlainText = (uint8_t*) malloc(TextSize);

......

......

Once the input text is encrypted or decrypted, both plain text and cipher text are displayed.

Plain text is displayed in ASCII format and the cipher text is displayed in both ASCII and hex

format (because cipher text may include non-printable characters).