private static SpongeState Iota(SpongeState state, int round)
{
int w = state.Size.W;
int l = state.Size.L;
Bitstring rc = Bitstring.Zeroes(w);
RoundT roundT;
int t;
int rnd = 7 * round;
for (int j = 0; j <= l; j++)
{
t = j + rnd;
roundT = new RoundT(round, t);
if (!_roundTConstants.ContainsKey(roundT))
{
_roundTConstants.Add(roundT, RoundConstant(t));
}
rc[(1 << j) - 1] = _roundTConstants[roundT];
}
state.XorLane(state.GetLane(0, 0), rc);
return(state);
}
private static SpongeState Rho(SpongeState state)
{
SpongeState newState = new SpongeState(state.Size, state.Rate);
int w = state.Size.W;
newState.SetLane(newState.GetLane(0, 0), state.GetLane(0, 0).GetBits());
int x = 1;
int y = 0;
int u, oldX;
for (int t = 0; t < 24; t++)
{
u = ((t + 1) * (t + 2)) >> 1;
for (int z = 0; z < w; z++)
{
newState[x, y, z] = state[x, y, Bin.Mod(z - u, w)];
}
oldX = x;
x = y;
y = Bin.Mod(2 * oldX + 3 * y, 5);
}
state.SetBitstring(newState.Bitstring);
return(state);
}
