public static uint h(ITwofishMDS mds, uint x, uint[] L)
{
int k = L.Length;
uint[] y = Word32Bits.ToUintBytes(x);
if (k == 4)
{
y[0] = (uint)q1(y[0]) ^ Word32Bits.GetByte(L[3], 0);
y[1] = (uint)q0(y[1]) ^ Word32Bits.GetByte(L[3], 1);
y[2] = (uint)q0(y[2]) ^ Word32Bits.GetByte(L[3], 2);
y[3] = (uint)q1(y[3]) ^ Word32Bits.GetByte(L[3], 3);
}
if (k >= 3)
{
y[0] = (uint)q1(y[0]) ^ Word32Bits.GetByte(L[2], 0);
y[1] = (uint)q1(y[1]) ^ Word32Bits.GetByte(L[2], 1);
y[2] = (uint)q0(y[2]) ^ Word32Bits.GetByte(L[2], 2);
y[3] = (uint)q0(y[3]) ^ Word32Bits.GetByte(L[2], 3);
}
y[0] = (uint)(q0(q0(y[0]) ^ Word32Bits.GetByte(L[1], 0)) ^ Word32Bits.GetByte(L[0], 0));
y[1] = (uint)(q0(q1(y[1]) ^ Word32Bits.GetByte(L[1], 1)) ^ Word32Bits.GetByte(L[0], 1));
y[2] = (uint)(q1(q0(y[2]) ^ Word32Bits.GetByte(L[1], 2)) ^ Word32Bits.GetByte(L[0], 2));
y[3] = (uint)(q1(q1(y[3]) ^ Word32Bits.GetByte(L[1], 3)) ^ Word32Bits.GetByte(L[0], 3));
return(mds.Multiply(y));
}
private uint[] Rounds(ITwofishMDS mds, uint[] K)
{
for (int round = 0; round < 16; round++)
{
K = Round(mds, K, round);
K = SwapWords(K);
}
return(K);
}
private uint[] Round(ITwofishMDS mds, uint[] K, int round)
{
uint F0 = TwofishFunction.h(mds, K[0], _key.SBox);
uint F1 = TwofishFunction.h(mds, Word32Bits.RotateLeft(K[1], 8), _key.SBox);
K[2] ^= F0 + F1 + _key.K[2 * round + 8];
K[2] = Word32Bits.RotateRight(K[2], 1);
K[3] = Word32Bits.RotateLeft(K[3], 1) ^ (F0 + 2 * F1 + _key.K[2 * round + 9]);
return(K);
}
public Twofish(ITwofishKey key, ITwofishMDS mds) : base(key.RawBytes)
{
_key = key;
_mds = mds;
}
public Twofish(byte[] key) : base(key)
{
_key = new TwofishKey(key);
_mds = new TwofishMDS();
}
