//decryption
private void дишифруванняToolStripMenuItem_Click(object sender, EventArgs e)
{
switch (number_decryption)
{
case 1:
Caesar decryption_Caesar = new Caesar();
richTextBox1.Text = decryption_Caesar.decryption(richTextBox1.Text);
break;
case 2:
Tritemius decryption_Tritemius = new Tritemius();
richTextBox1.Text = decryption_Tritemius.decryption(richTextBox1.Text);
break;
case 3:
gamm decryption_Gamm = new gamm();
richTextBox1.Text = decryption_Gamm.decryption(richTextBox1.Text);
break;
case 4:
Book_code decryption_Book_code = new Book_code();
richTextBox1.Text = decryption_Book_code.decryption(richTextBox1.Text);
break;
case 5:
DES decryption_DES = new DES();
richTextBox1.Text = decryption_DES.decryption(richTextBox1.Text, cryptic.Key, cryptic.IV);
break;
case 0:
MessageBox.Show("Виберіть метод дешифрування", "Error:", MessageBoxButtons.OK);
break;
}
}
//encryption
private void шифруванняToolStripMenuItem_Click(object sender, EventArgs e)
{
switch (number_decryption)
{
case 1:
Caesar encryption_Caesar = new Caesar();
richTextBox1.Text = encryption_Caesar.encryption(richTextBox1.Text);
break;
case 2:
Tritemius encryption_Tritemius = new Tritemius();
richTextBox1.Text = encryption_Tritemius.encryption(richTextBox1.Text, false);
break;
case 3:
gamm encryption_Gamm = new gamm();
richTextBox1.Text = encryption_Gamm.encryption(richTextBox1.Text);
//label1.Text = encryption_Gamm.str_key();
break;
case 4:
Book_code encryption_Book_code = new Book_code();
richTextBox1.Text = encryption_Book_code.encryption(richTextBox1.Text);
break;
case 5:
DES encryption_DES = new DES();
richTextBox1.Text = encryption_DES.encryption(richTextBox1.Text, cryptic.Key, cryptic.IV);
break;
case 0:
MessageBox.Show("Виберіть метод шифрування", "Error:", MessageBoxButtons.OK);
break;
}
}
public string encryptGronsfeld(string _plainText, int _key)
{
string cipherText = null;
bool lowercase = false;
string cipherChar = null;
int letterNum = 0;
// use algorithm from Caesar cipher because gronsfeld is just a modified caesar
// cipher
Caesar modifiedCaesar = new Caesar();
try
{
// loop through each digit within the key
for (int x = 0; x < (_plainText.Length / Convert.ToInt32(Math.Abs(_key).ToString().Length)) + 1; x++)
{
for (int y = 0; y < Convert.ToInt32(Math.Abs(_key).ToString().Substring(Math.Abs(_key).ToString().Length - 1)); y++)
{
// pass the character and the correspoinding number from the key to
// Caesar.encryption
cipherText = modifiedCaesar.encryption(Convert.ToChar(_plainText.Substring(letterNum, 1)), lowercase, cipherChar, -Convert.ToInt32(Math.Abs(_key).ToString().Substring(y, 1)));
letterNum++;
}
}
}
catch (Exception)
{
//lazy error handling
}
return(cipherText);
}
//encryption
private void шифруванняToolStripMenuItem_Click(object sender, EventArgs e)
{
switch (number_decryption)
{
case 1:
Caesar encryption_Caesar = new Caesar();
richTextBox1.Text = encryption_Caesar.encryption(richTextBox1.Text);
break;
case 2:
Tritemius encryption_Tritemius = new Tritemius();
richTextBox1.Text = encryption_Tritemius.encryption(richTextBox1.Text, false);
break;
case 3:
gamm encryption_Gamm = new gamm();
richTextBox1.Text = encryption_Gamm.encryption(richTextBox1.Text);
//label1.Text = encryption_Gamm.str_key();
break;
case 4:
Book_code encryption_Book_code = new Book_code();
richTextBox1.Text = encryption_Book_code.encryption(richTextBox1.Text);
break;
case 5:
DES encryption_DES = new DES();
richTextBox1.Text = encryption_DES.encryption(richTextBox1.Text, cryptic.Key, cryptic.IV);
break;
case 6:
Backpack encryption_Backpack = new Backpack();
richTextBox1.Text = encryption_Backpack.encryption(richTextBox1.Text);
break;
case 7:
RSA encryption_RSA = new RSA();
Book_code_Form q = new Book_code_Form();
q.Get_button4_Visible(false);
q.ShowDialog();
string st_key = q.Get_Key_backpack();
richTextBox1.Text = encryption_RSA.encryption(richTextBox1.Text, st_key);
RSA = encryption_RSA.Encrypti_byte;
label1.Text = rsa.ToXmlString(false) + "\n" + rsa.ToXmlString(true);
//label1.Visible = true;
break;
case 0:
MessageBox.Show("Виберіть метод шифрування", "Error:", MessageBoxButtons.OK);
break;
}
}
//decryption
private void дишифруванняToolStripMenuItem_Click(object sender, EventArgs e)
{
switch (number_decryption)
{
case 1:
Caesar decryption_Caesar = new Caesar();
richTextBox1.Text = decryption_Caesar.decryption(richTextBox1.Text);
break;
case 2:
Tritemius decryption_Tritemius = new Tritemius();
richTextBox1.Text = decryption_Tritemius.decryption(richTextBox1.Text);
break;
case 3:
gamm decryption_Gamm = new gamm();
richTextBox1.Text = decryption_Gamm.decryption(richTextBox1.Text);
break;
case 4:
Book_code decryption_Book_code = new Book_code();
richTextBox1.Text = decryption_Book_code.decryption(richTextBox1.Text);
break;
case 5:
DES decryption_DES = new DES();
richTextBox1.Text = decryption_DES.decryption(richTextBox1.Text, cryptic.Key, cryptic.IV);
break;
case 6:
Backpack decryption_Backpack = new Backpack();
richTextBox1.Text = decryption_Backpack.decryption(richTextBox1.Text);
break;
case 7:
RSA decryption_RSA = new RSA();
decryption_RSA.Encrypti_byte = RSA;
Book_code_Form q = new Book_code_Form();
q.Get_button4_Visible(false);
q.ShowDialog();
string st_key = q.Get_Key_backpack();
richTextBox1.Text = decryption_RSA.decryption(richTextBox1.Text, st_key);
//label1.Visible = false;
break;
case 0:
MessageBox.Show("Виберіть метод дешифрування", "Error:", MessageBoxButtons.OK);
break;
}
}
private void btnEncrypt_Click(object sender, EventArgs e)
{
// make sure the user has entered a plain text message
if (txtPlainText.Text != "" && txtPlainText.Text != " ")
{
int cipher = cboCipher.SelectedIndex;
string plainText = txtPlainText.Text;
string cipherText = null;
// instantiate the class for the selected cipher, declare and assign value
// to a key variable if neccesary, call the encrypt method
switch (cipher)
{
case 0:
HashFunction hash = new HashFunction();
cipherText = hash.EncrpytHash(plainText);
break;
case 1:
Caesar caesar = new Caesar();
try
{
int cKey = Convert.ToInt32(txtKey.Text);
cipherText = caesar.EncrpytCaesar(plainText, cKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 2:
try {
RailFence railFence = new RailFence();
int rKey = Convert.ToInt32(txtKey.Text);
cipherText = railFence.encryptRailFence(plainText, rKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 3:
Polybius polybius = new Polybius();
cipherText = polybius.encryptPoly(plainText);
break;
case 4:
try
{
Gronsfeld gronsfeld = new Gronsfeld();
int gKey = Convert.ToInt32(txtKey.Text);
cipherText = gronsfeld.encryptGronsfeld(plainText, gKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 5:
FourSquare fourSquare = new FourSquare();
cipherText = fourSquare.encryptFourSquare(plainText);
break;
}
// ensure that the message was encrypted
if (cipherText != null)
{
txtCipherText.Text = cipherText;
}
}
else
{
MessageBox.Show("Please enter a message to encrypt");
}
}
private void btnDecrpyt_Click(object sender, EventArgs e)
{
// make sure the user has entered a cipher text message
int cipher = cboCipher.SelectedIndex;
int key = 0;
string plainText = null;
string cipherText = txtCipherText.Text;
// instantiate the class for the selected cipher, declare and assign value
// to a key variable if neccesary, call the decrypt method
switch (cipher)
{
case 0:
MessageBox.Show("Hash functions cannot be decrypted");
break;
case 1:
try {
Caesar dCaesar = new Caesar();
key = Convert.ToInt32(txtKey.Text);
plainText = dCaesar.EncrpytCaesar(cipherText, -key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 2:
try {
RailFence dRailFence = new RailFence();
key = Convert.ToInt32(txtKey.Text);
plainText = dRailFence.decryptRailFence(cipherText, key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 3:
Polybius dPolybius = new Polybius();
plainText = dPolybius.decryptPoly(cipherText);
break;
case 4:
try {
Gronsfeld dGronsfeld = new Gronsfeld();
key = Convert.ToInt32(txtKey.Text);
plainText = dGronsfeld.encryptGronsfeld(cipherText, -key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
}
// ensure that the message was decrypted
if (cipherText != null)
{
txtPlainText.Text = plainText;
}
}
