private void Hash(byte[] output, uint[] input)
{
uint[] state = (uint[])input.Clone();
for (int round = m_rounds; round > 0; round -= 2)
{
state[4] ^= Rotate(Add(state[0], state[12]), 7);
state[8] ^= Rotate(Add(state[4], state[0]), 9);
state[12] ^= Rotate(Add(state[8], state[4]), 13);
state[0] ^= Rotate(Add(state[12], state[8]), 18);
state[9] ^= Rotate(Add(state[5], state[1]), 7);
state[13] ^= Rotate(Add(state[9], state[5]), 9);
state[1] ^= Rotate(Add(state[13], state[9]), 13);
state[5] ^= Rotate(Add(state[1], state[13]), 18);
state[14] ^= Rotate(Add(state[10], state[6]), 7);
state[2] ^= Rotate(Add(state[14], state[10]), 9);
state[6] ^= Rotate(Add(state[2], state[14]), 13);
state[10] ^= Rotate(Add(state[6], state[2]), 18);
state[3] ^= Rotate(Add(state[15], state[11]), 7);
state[7] ^= Rotate(Add(state[3], state[15]), 9);
state[11] ^= Rotate(Add(state[7], state[3]), 13);
state[15] ^= Rotate(Add(state[11], state[7]), 18);
state[1] ^= Rotate(Add(state[0], state[3]), 7);
state[2] ^= Rotate(Add(state[1], state[0]), 9);
state[3] ^= Rotate(Add(state[2], state[1]), 13);
state[0] ^= Rotate(Add(state[3], state[2]), 18);
state[6] ^= Rotate(Add(state[5], state[4]), 7);
state[7] ^= Rotate(Add(state[6], state[5]), 9);
state[4] ^= Rotate(Add(state[7], state[6]), 13);
state[5] ^= Rotate(Add(state[4], state[7]), 18);
state[11] ^= Rotate(Add(state[10], state[9]), 7);
state[8] ^= Rotate(Add(state[11], state[10]), 9);
state[9] ^= Rotate(Add(state[8], state[11]), 13);
state[10] ^= Rotate(Add(state[9], state[8]), 18);
state[12] ^= Rotate(Add(state[15], state[14]), 7);
state[13] ^= Rotate(Add(state[12], state[15]), 9);
state[14] ^= Rotate(Add(state[13], state[12]), 13);
state[15] ^= Rotate(Add(state[14], state[13]), 18);
}
for (int index = 0; index < 16; index++)
ToBytes(Add(state[index], input[index]), output, 4 * index);
}