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));
}
public void GetByte_GetsByteFromWord_GotByte()
{
uint value = 1305570306;
Assert.AreEqual(2, Word32Bits.GetByte(value, 0));
Assert.AreEqual(108, Word32Bits.GetByte(value, 1));
Assert.AreEqual(209, Word32Bits.GetByte(value, 2));
Assert.AreEqual(77, Word32Bits.GetByte(value, 3));
}