void EncryptionTask()
{
uint8_t i, data[32], len;
while(1) {
nrk_led_toggle(ORANGE_LED);
/* 16-byte AES key */
uint8_t key[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
/* 32-byte string is used as example plaintext data */
sprintf(data, "This string is used as an input");
len = 32;
/* Set AES encryption key
** (must be 16 bytes) */
aes_setkey(key);
printf("key hex (16B): ");
for(i=0; i<16; i++)
printf("%x ", key[i]);
printf("\r\n");
printf("plaintext (%dB): \"%s\"\r\n", len, data);
printf("plaintext hex: ");
for(i=0; i<len; i++)
printf("%x ", data[i]);
printf("\r\n");
/* Encrypt data (len must be
** a multiple of 16 bytes) */
aes_encrypt(data, len);
printf("\t\t\t\t...encrypt...\r\n");
printf("cyphertext hex: ");
for(i=0; i<len; i++)
printf("%x ", data[i]);
printf("\r\n");
/* Decrypt data (len must be
** a multiple of 16 bytes) */
aes_decrypt(data, len);
printf("\t\t\t\t...decrypt...\r\n");
printf("plaintext hex: ");
for(i=0; i<len; i++)
printf("%x ", data[i]);
printf("\r\n\r\n\r\n");
nrk_wait_until_next_period();
}
}
int aes_cypher(void *out, const void *in, uint32_t size, const void *iv,
const void *key, uint32_t keysize, int mode, int encrypt)
{
int ret = OK;
if ((size & (AES_BLOCK_SIZE-1)) != 0)
{
return -EINVAL;
}
if (keysize != 16)
{
return -EINVAL;
}
ret = sem_wait(&aes_lock);
if (ret < 0)
{
return ret;
}
/* AES must be disabled before changing mode, key or IV. */
aes_enable(false);
ret = aes_setup_cr(mode, encrypt);
if (ret < 0)
{
goto out;
}
aes_setkey(key, keysize);
if (iv)
{
aes_setiv(iv);
}
aes_enable(true);
while (size)
{
aes_encryptblock(out, in);
out = (uint8_t *)out + AES_BLOCK_SIZE;
in = (uint8_t *)in + AES_BLOCK_SIZE;
size -= AES_BLOCK_SIZE;
}
aes_enable(false);
out:
sem_post(&aes_lock);
return ret;
}
void passchk (void) {
char test1[100] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", test2[100] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
enc1[100], enc2[100], *p = getpass ("\n[0;0mPassword verification:");
memset (enc1, 0, 100);
memset (enc2, 0, 100);
security_through_obscurity (1);
encode64 (test1, enc1, strlen (test1));
security_through_obscurity (0);
aes_setkey (p);
encode64 (test2, enc2, strlen (test2));
if (strcmp (enc1, enc2)) {
fprintf (stderr, "Sorry, passwords do not match.\n");
fprintf (stderr, "1 %s\n2 %s\n", enc1, enc2);
exit (0);
}
}
static int aes_generic_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
return aes_setkey(tfm, key, keylen);
}
