Hex XOR

CSharp · Console

/Program.cs

using System;
using System.Linq;
						
namespace HexXor
{
	public class HexString
	{
		private byte[] _data;
		
		public HexString(string data)
		{
			if ((data.Length & 1)!= 0) throw new ArgumentException("Hex string must have an even number of digits.");
			
			_data = Enumerable.Range(0, data.Length)
                .Where(x => x % 2 == 0)
                .Select(x => Convert.ToByte(data.Substring(x, 2), 16))
                .ToArray();
		}
	
		public HexString(byte[] data)
		{
			_data = data;
		}
		
		
		public override string ToString()
		{
			string hex = BitConverter.ToString(_data);
			return hex.Replace("-","");
		}
	
		static public HexString operator ^(HexString LHS, HexString RHS)
		{
			return new HexString
				(
					LHS._data.Zip
						( 
							RHS._data, 
							(a, b) => (byte)(a ^ b)
						)
					.ToArray()
				);
		} 
	}
	
		
	public class Program
	{
		
		
		static public void Main()
		{
			HexString bdk1 = new HexString("8D10DA193E98524379264ADFFD043632");
			HexString bdk2 = new HexString("8C339F7EB7339FAC87FAF0478B500422");
			
			const string expected = "0123456789ABCDEFFEDCBA9876543210";
			
			
			HexString actual = bdk1 ^ bdk2;
			
			Console.WriteLine("Expected: " + expected);
			Console.WriteLine("Actual  : " + actual);
			
			Console.ReadLine(); 
		}
		
	}
}