private static byte q(byte x, byte[,] t)
{
int a0 = x / 16;
int b0 = x % 16;
int a1 = a0 ^ b0;
int b1 = a0 ^ Word4Bits.RotateRight((byte)b0) ^ 8 * a0 % 16;
int a2 = t[0, a1];
int b2 = t[1, b1];
int a3 = a2 ^ b2;
int b3 = a2 ^ Word4Bits.RotateRight((byte)b2) ^ 8 * a2 % 16;
int a4 = t[2, a3];
int b4 = t[3, b3];
return(Convert.ToByte(16 * b4 + a4));
}
public void RotateLeft_RotatesOneBit_Rotated()
{
Assert.AreEqual(15, Word4Bits.RotateLeft(15));
Assert.AreEqual(14, Word4Bits.RotateLeft(7));
}
public void RotateRight_RotatesThreeBits_Rotated()
{
Assert.AreEqual(15, Word4Bits.RotateRight(15, 3));
Assert.AreEqual(7, Word4Bits.RotateRight(11, 3));
}
public void RotateRight_RotatesOneBit_Rotated()
{
Assert.AreEqual(15, Word4Bits.RotateRight(15));
Assert.AreEqual(7, Word4Bits.RotateRight(14));
}
public void RotateLeft_RotatesThreeBits_Rotated()
{
Assert.AreEqual(15, Word4Bits.RotateLeft(15, 3));
Assert.AreEqual(11, Word4Bits.RotateLeft(7, 3));
}