private string Plaintext(string encryptedString, string key)
{
string send = string.Empty;
string plaintext = string.Empty;
for (int i = 0; i < encryptedString.Length; i += 16)
{
if (encryptedString.Length - i > 16)
{
send = encryptedString.Substring(i, 16);
}
else
{
send = encryptedString.Substring(i, encryptedString.Length - i);
}
if (send.Length != 16)
{
int missing = 16 - send.Length;
for (int j = 0; j < missing; j++)
{
send += "0";
}
}
var des = new DESClass()
{
Ciphertext = send, Key = key
};
des.DecipherString(rounds);
plaintext += des.Plaintext;
}
return(plaintext);
}
private string Ciphertext(string sourceString, string key)
{
string send = string.Empty;
string ciphertext = string.Empty;
for (int i = 0; i < sourceString.Length; i += 8)
{
if (sourceString.Length - i > 8)
{
send = sourceString.Substring(i, 8);
}
else
{
send = sourceString.Substring(i, sourceString.Length - i);
}
if (send.Length != 8)
{
int missing = 8 - send.Length;
for (int j = 0; j < missing; j++)
{
send += "0";
}
}
var des = new DESClass()
{
Plaintext = send, Key = key
};
des.CipherString(rounds);
ciphertext += des.Ciphertext;
}
return(ciphertext);
}
public void AllAroundHexTest()
{
string M = "";
string key = "";
char[] possible = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
Random random = new Random();
int posicion;
for (var j = 0; j < 16; j++)
{
posicion = random.Next(16);
M += possible[posicion];
posicion = random.Next(16);
key += possible[posicion];
}
var cipher = new DESClass();
cipher.Plaintext = M;
cipher.Key = key;
cipher.CipherHex(16);
var decipher = new DESClass();
decipher.Ciphertext = cipher.Ciphertext;
decipher.Key = key;
decipher.DecipherHex(16);
Assert.AreEqual(M, decipher.Plaintext, true);
}
public string Decrypt(string encryptedString)
{
var des = new DESClass()
{
Ciphertext = encryptedString, Key = key
};
des.DecipherString(rounds);
return(des.Plaintext);
}
public string Encrypt(string sourceString)
{
var des = new DESClass()
{
Plaintext = sourceString, Key = key
};
des.CipherString(rounds);
return(des.Ciphertext);
}
public void DecipherHexTest()
{
string M = "85E813540F0AB405";
string key = "133457799BBCDFF1";
var test = new DESClass();
test.Ciphertext = M;
test.Key = key;
test.DecipherHex(16);
Assert.AreEqual("0123456789ABCDEF", test.Plaintext, true);
}
private void cipherButton_Click(object sender, RoutedEventArgs e)
{
string plaintext = messagebox.Text;
string key = keybox.Text;
string ciphertext = string.Empty;
string works = string.Empty;
string send = string.Empty;
bool hex = (bool)hexRadio.IsChecked;
int round = roundBox.SelectedIndex + 1;
if (hex)
{
for (int i = 0; i < plaintext.Length; i += 16)
{
if (plaintext.Length - i > 16)
{
send = plaintext.Substring(i, 16);
}
else
{
send = plaintext.Substring(i, plaintext.Length - i);
}
if (send.Length != 16)
{
int missing = 16 - send.Length;
for (int j = 0; j < missing; j++)
{
send += "0";
}
}
works += string.Format("Part {0}{1}", i, Environment.NewLine);
var des = new DESClass()
{
Plaintext = send, Key = key
};
des.CipherHex(round);
works += string.Format("{0}{1}{1}", des.Work, Environment.NewLine);
ciphertext += des.Ciphertext;
}
}
else
{
for (int i = 0; i < plaintext.Length; i += 8)
{
if (plaintext.Length - i > 8)
{
send = plaintext.Substring(i, 8);
}
else
{
send = plaintext.Substring(i, plaintext.Length - i);
}
if (send.Length != 8)
{
int missing = 8 - send.Length;
for (int j = 0; j < missing; j++)
{
send += "0";
}
}
works += string.Format("Part {0}{1}", i, Environment.NewLine);
var des = new DESClass()
{
Plaintext = send, Key = key
};
des.CipherString(round);
works += string.Format("{0}{1}{1}", des.Work, Environment.NewLine);
ciphertext += des.Ciphertext;
}
}
workText.Text = string.Format("{0}{1} CipherBytes: {2}", works, Environment.NewLine, ciphertext);
}