private static SpongeState Theta(SpongeState state)
{
int w = state.Size.W;
bool[,] c = new bool[5, w];
for (int x = 0; x < 5; x++)
{
for (int z = 0; z < w; z++)
{
c[x, z] = state.GetColumn(x, z).GetBits().Aggregate((bool lhs, bool rhs) => { return(lhs ^ rhs); });
}
}
bool[,] d = new bool[5, w];
for (int x = 0; x < 5; x++)
{
for (int z = 0; z < w; z++)
{
d[x, z] = c[Bin.Mod(x - 1, 5), z] ^ c[Bin.Mod(x + 1, 5), Bin.Mod(z - 1, w)];
}
}
for (int x = 0; x < 5; x++)
{
for (int z = 0; z < w; z++)
{
bool bit = d[x, z];
for (int y = 0; y < 5; y++)
{
state[x, y, z] ^= bit;
}
}
}
return(state);
}
internal Bit(SpongeState state, int x, int y, int z)
{
State = state;
X = x;
Y = y;
Z = z;
}
private static SpongeState Pi(SpongeState state)
{
SpongeState newState = new SpongeState(state.Size, state.Rate);
int w = state.Size.W;
for (int y = 0; y < 5; y++)
{
for (int x = 0; x < 5; x++)
{
for (int z = 0; z < w; z++)
{
newState[x, y, z] = state[Bin.Mod(x + 3 * y, 5), x, z];
}
}
}
state.SetBitstring(newState.Bitstring);
return(state);
}
private static SpongeState Khi(SpongeState state)
{
SpongeState newState = new SpongeState(state.Size, state.Rate);
int w = state.Size.W;
for (int y = 0; y < 5; y++)
{
for (int x = 0; x < 5; x++)
{
for (int z = 0; z < w; z++)
{
newState[x, y, z] = state[x, y, z]
^ ((state[Bin.Mod(x + 1, 5), y, z] ^ true) && state[Bin.Mod(x + 2, 5), y, z]);
}
}
}
state.SetBitstring(newState.Bitstring);
return(state);
}
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);
}
/// <summary>
/// Creates a new <see cref="SpongeState"/> from an existing one.
/// </summary>
/// <param name="state">The sponge state to copy.</param>
public SpongeState(SpongeState state)
{
_size = state._size;
_rate = state._rate;
_bitstring = new Bitstring(state._bitstring);
}
internal Slice(SpongeState state, int z)
{
State = state;
Z = z;
}
internal Sheet(SpongeState state, int x)
{
State = state;
X = x;
}
internal Plane(SpongeState state, int y)
{
State = state;
Y = y;
}
internal Lane(SpongeState state, int x, int y)
{
State = state;
X = x;
Y = y;
}
internal Column(SpongeState state, int x, int z)
{
State = state;
X = x;
Z = z;
}
internal Row(SpongeState state, int y, int z)
{
State = state;
Y = y;
Z = z;
}
/// <summary>
/// Creates a new <see cref="SpongeConstruction"/>, specifying the size of the construction and its rate.
/// </summary>
/// <param name="size">The size of the sponge construction.</param>
/// <param name="rate">The rate of the sponge construction.</param>
protected SpongeConstruction(SpongeSize size, int rate)
{
State = new SpongeState(size, rate);
}