/* CryptoNight Step 5: Apply Keccak to the state again, and then
* use the resulting data to select which of four finalizer
* hash functions to apply to the data (Blake, Groestl, JH,
* or Skein). Use this hash to squeeze the state array down
* to the final 32 byte hash output.
*/
public static byte[] HashFinalState(CNState cnState)
{
/* Get the state buffer as an array of ulongs rather than bytes */
ulong[] hashState = cnState.GetHashState();
Keccak.Keccakf(hashState, 24);
/* Set the state buffer from the coerced hash state */
cnState.SetHashState(hashState);
/* Get the actual state buffer finally */
byte[] state = cnState.GetState();
/* Choose the final hashing function to use based on the value of
* state[0] */
switch (state[0] % 4)
{
case 0:
{
return(new Blake().Hash(state));
}
case 1:
{
return(new Groestl().Hash(state));
}
case 2:
{
return(new JH().Hash(state));
}
default:
{
return(new Skein().Hash(state));
}
}
}