private static void BytesToWords128(byte[] key, out QWords128 words128)
{
fixed(byte *k = key)
{
words128 = *((QWords128 *)k);
}
}
static void Update(byte *bytes, uint len,
QWords128 *keyStreamBuf, ref uint keystreamBufferPos, ref QWords128 counter, Keys128128 keys)
{
while (len > 0)
{
var remainningKeystream = KeystreamBufferSize - keystreamBufferPos;
if (remainningKeystream == 0)
{
keystreamBufferPos = 0;
remainningKeystream = KeystreamBufferSize;
var ksb = keyStreamBuf;
for (uint i = 0; i < KsBlockCount; i += 4)
{
for (uint j = 0; j < 4; j++)
{
ksb[i + j] = counter;
if (++counter.v1 == 0)
{
++counter.v0;
}
}
Cipher.encrypt_128_128_4blocks(keys, &ksb[i]);
}
}
var count = len < remainningKeystream ? len : remainningKeystream;
NaiveUtils.XorBytesUnsafe((byte *)keyStreamBuf + keystreamBufferPos, bytes, count);
bytes += count;
len -= count;
keystreamBufferPos += count;
}
}
// Generate key schedule and encrypt at the same time
public static void encrypt_128_128(QWords128 key, ref QWords128 ciphertext)
{
speck_round_64(ref ciphertext.v1, ref ciphertext.v0, key.v0);
for (uint64 i = 0; i < ROUNDS128128 - 1; i++)
{
speck_round_64(ref key.v1, ref key.v0, i);
speck_round_64(ref ciphertext.v1, ref ciphertext.v0, key.v0);
}
}
public static Keys128128 getKeySchedules_128_128(QWords128 key)
{
var r = Keys128128.alloc();
var keys = r.keys;
keys[0] = key.v0;
for (uint64 i = 0; i < ROUNDS128128 - 1; i++)
{
speck_round_64(ref key.v1, ref key.v0, i);
keys[1 + i] = key.v0;
}
return(r);
}
