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 res = OK;
if (size % 16)
{
return -EINVAL;
}
aes_lock();
res = aes_setup_mr(keysize, mode & AES_MODE_MASK, encrypt);
if (res)
{
aes_unlock();
return res;
}
aes_memcpy((void *)SAM_AES_KEYWR, key, keysize);
if (iv)
{
aes_memcpy((void *)SAM_AES_IVR, iv, AES_BLOCK_SIZE);
}
while (size)
{
if ((mode & AES_MODE_MAC) == 0)
{
aes_encryptblock(out, in);
out = (char *)out + AES_BLOCK_SIZE;
}
else if (size == AES_BLOCK_SIZE)
{
aes_encryptblock(out, in);
}
else
{
aes_encryptblock(NULL, in);
}
in = (char *)in + AES_BLOCK_SIZE;
size -= AES_BLOCK_SIZE;
}
aes_unlock();
return res;
}
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;
}