/// <summary>
/// Given 2 hex strings, compute the XOR
/// </summary>
/// <param name="val1">Hex string value 1</param>
/// <param name="val2">Hex string value 2</param>
public string DoChallenge02(string val1, string val2)
{
//Input values must be the same size
if (val1.Length != val2.Length)
{
throw new Exception("Input values must be the same length.");
}
byte[] b1 = HexStringToByteArrayConverter.Convert(val1);
byte[] b2 = HexStringToByteArrayConverter.Convert(val2);
byte[] result = XOR.ExclusiveOR(b1, b2);
return(BitConverter.ToString(result).Replace("-", ""));
}