C# Tutorial "Symmetric Cryptography" : Exercise: Create Round Function

Symmetric Cryptography

Exercise: Create Round Function

Please implement round function F as you see in picture

using System;
using System.Text;
					
public class Program
{
	public  const uint SECRET = 4294967295;
	
	public static void Main()
	{
		UInt16 block = 21369;

		var cipherBlock = F(block);

		Console.Write(cipherBlock);
	}
	
	public static UInt16 F(UInt16 originalBlock)
	{
		UInt16 result = (UInt16) (originalBlock ^ 65535);

		result = (UInt16) (result << 5);

		return result;
	}
}