public string BreakXor()
{
byte [] bestBytes = null;
int bestScore = int.MinValue;
var hex = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
var bytes = Util.HexToBytes(hex);
for (var j = 0; j < 256; j++)
{
var keyByte = (byte)j;
var keyBytes = new byte [256];
for (var i = 0; i < keyBytes.Length; i++)
{
keyBytes[i] = keyByte;
}
var result = new Challenge2().Xor(bytes, keyBytes);
var score = Score(result);
if (j == 0)
{
bestBytes = result;
bestScore = score;
}
else if (score > bestScore)
{
bestBytes = result;
bestScore = score;
}
}
var resultText = new string(bestBytes.Select(x => (char)x).ToArray());
return(resultText);
}
public void WebTest()
{
var hex0 = "1c0111001f010100061a024b53535009181c";
var hex1 = "686974207468652062756c6c277320657965";
var expectedHex = "746865206b696420646f6e277420706c6179";
var challenge = new Challenge2();
var result = Util.ToHex(challenge.Xor(Util.HexToBytes(hex0), Util.HexToBytes(hex1)));
result.ShouldBe(expectedHex);
}
