private void BreakSimpleXorEncryption(object sender, EventArgs e)
{
var str = System.IO.File.ReadAllText("Files\\6.txt");
str = CryptoTools.BreakRepeatingKeyXor(str);
txtOutput.Text = str;
}
private void DetectXor(object sender, EventArgs e)
{
var xord = new List <string>();
var highestScore = 0;
var encryptionChar = (byte)0;
var textToDecrypt = string.Empty;
var lineScore = 0;
var lineEncryptionChar = (byte)0;
for (var i = 0; i < txtDetectXor.Lines.Length; i++)
{
var str = txtDetectXor.Lines[i];
CryptoTools.FindAndDecode(str, out lineScore, out lineEncryptionChar);
if (lineScore > highestScore)
{
highestScore = lineScore;
encryptionChar = lineEncryptionChar;
textToDecrypt = str;
}
xord.Add(string.Format("{0} {1} {2}", lineScore, lineEncryptionChar, str));
}
txtDetectXor.Lines = xord.ToArray();
var y = encryptionChar.Xor(textToDecrypt.AsHexToByteArray());
lblDetectXor.Text = Encoding.UTF8.GetString(y);
}
private void ScoreXor(object sender, EventArgs e)
{
var highestScore = 0;
byte encryptionChar = (byte)0;
txtXorScoreResults.Text = CryptoTools.FindAndDecode(txtXorScore.Text, out highestScore, out encryptionChar);
}
private void DecryptAesEcb(object sender, EventArgs e)
{
var str = System.IO.File.ReadAllText("Files\\7.txt");
var ba = Convert.FromBase64String(str);
var key = Encoding.UTF8.GetBytes("YELLOW SUBMARINE");
var decryptedArray = CryptoTools.DecryptAesEcb(key, ba);
txtOutput.Text = Encoding.UTF8.GetString(decryptedArray);
}
private void button1_Click(object sender, EventArgs e)
{
var txt = System.IO.File.ReadAllText("Files\\10.txt");
var ba = Convert.FromBase64String(txt);
ba = CryptoTools.PadToMultiple(ba, 16);
var key = Encoding.UTF8.GetBytes("YELLOW SUBMARINE");
txtOutput.Text = CryptoTools.CbcDecrypt(key, new byte[16], ba);
}
private void PadText(object sender, EventArgs e)
{
var source = Encoding.UTF8.GetBytes(txtPadSrc.Text);
var multipleOf = Convert.ToInt32(txtPadMultiple.Text);
var str = Encoding.UTF8.GetString(CryptoTools.PadToMultiple(source, multipleOf));
txtOutput.Text = Regex.Replace(str,
@"\p{Cc}",
a => string.Format("\\x{0:X2}", (byte)a.Value[0])
);
}
public static string FindAndDecode(byte[] source, out int highestScore, out byte encryptionChar)
{
highestScore = 0;
var highestScoreText = string.Empty;
encryptionChar = (byte)0;
for (var i = 0; i <= 255; i++)
{
var resArray = i.Xor(source);
var score = CryptoTools.CountPrintables(resArray);
if (score > highestScore)
{
highestScore = score;
highestScoreText = Encoding.UTF8.GetString(resArray);
encryptionChar = (byte)i;
}
}
return(highestScoreText);
}
private void GetHammingDistance(object sender, EventArgs e)
{
lblHamming.Text = CryptoTools.HammingDistance(txtHamming1.Text, txtHamming2.Text).ToString();
}
