void AES_CMAC_sign(unsigned int message_bytes, const unsigned char *message, unsigned char *signature, unsigned int key_bytes, const unsigned char *key, const unsigned char *iv) {
unsigned char i;
AES_CBC_encrypt(AES_BLOCK_BYTES, message, signature, key_bytes, key, iv);
for (i = 1; i < message_bytes / AES_BLOCK_BYTES; i++) {
AES_CBC_encrypt(AES_BLOCK_BYTES, message + i*AES_BLOCK_BYTES, signature, key_bytes, key, signature);
}
}
int main( void )
{
/* Assume that everything is ok*/
success = true;
/* Before using the AES it is recommended to do an AES software reset to put
* the module in known state, in case other parts of your code has accessed
* the AES module. */
AES_software_reset();
/* Generate last subkey. */
AES_lastsubkey_generate(key, lastsubkey);
/* Do AES Cipher Block Chaining encryption and decryption on three blocks. */
success = AES_CBC_encrypt(); /* MODIFY THE FUNCTION CALL */
success = AES_CBC_decrypt(); /* MODIFY THE FUNCTION CALL */
/* Check if decrypted answer is equal to plaintext. */
for(uint8_t i = 0; i < BLOCK_LENGTH * BLOCK_COUNT ; i++ ){
if (data_block[i] != block_ans[i]){
success = false;
}
}
if(success){
while(true){
/* If the example ends up here every thing is ok. */
nop();
}
}else{
while(true){
/* If the example ends up here something is wrong. */
nop();
}
}
}
int main(void) {
int i;
int ret_val;
uint8_t *output;
/* Initialize the IV for each cbc key structure */
for (i = 0; i < 16; i++) {
trans_key_sched.IV[i] = CBC_IV[i];
hash_key_sched.IV[i] = CBC_HASH_IV[i];
}
trans_key_sched.aeskey.nr = 14;
hash_key_sched.aeskey.nr = 10;
/* Generate key schedule for public hash key */
ret_val = AES_set_encrypt_key((unsigned char *)(&AES128_HASH_KEY),
128,
(AES_KEY *)&(hash_key_sched.aeskey));
if (ret_val < 0) {
printf("ERROR: Unable to generate hash key schedule");
return ERROR;
}
ret_val = AES_set_encrypt_key((unsigned char *)(&AES256_TEST_KEY),
256,
(AES_KEY *)&(trans_key_sched.aeskey));
if (ret_val < 0) {
printf("ERROR: Unable to generate transformed key schedule");
return ERROR;
}
AES_transform_key(trans_key_sched.aeskey.KEY);
printf("Managed to transform trans_key_sched.\n");
/* Before exiting clear out the value of x from the register and
* put it back into the debug register
*/
output = (uint8_t *)(malloc(LENGTH));
if (output == NULL) {
return 0;
}
printf("Value of output: %p\n", output);
AES_CBC_encrypt((unsigned char *)AES_TEST_VECTOR,
(unsigned char *)(output),
(unsigned char *)(trans_key_sched.IV),
LENGTH,
trans_key_sched.aeskey.KEY,
trans_key_sched.aeskey.nr);
for (i = 0; i < 64; i++) {
if (output[i] == AES_TEST_VECTOR[i]) {
printf("Problem with output at %d.\n", i);
return -1;
}
}
AES_CBC_encrypt((unsigned char *)(output),
(unsigned char *)(output),
(unsigned char *)(trans_key_sched.IV),
LENGTH,
trans_key_sched.aeskey.KEY,
trans_key_sched.aeskey.nr);
for (i = 0; i < 64; i++) {
if (output[i] != AES_TEST_VECTOR[i]) {
printf("Problem at %d.\n", i);
//return -1;
}
}
return 0;
}
