public string Decrypt(string message, CardanGrilleKey key)
{
// проверка ключа на четность
// проверка вмещается ли сообщение
return new Decrypter().Decrypt(message, key);
}
public string Decrypt(string message, CardanGrilleKey key)
{
decryptMessage = new StringBuilder(new string('_', message.Length));
this.message = new TableMessage(message, key.MatrixOrder);
matrixSize = (key.MatrixOrder * key.MatrixOrder) / 4 * 4;
messagePosition = 0;
Travel(message, key);
return decryptMessage.ToString().TrimEnd('_');
}
protected void Travel(string message, CardanGrilleKey key)
{
//Position[] currentPositions = new Position[key.Positions.Length];
//Array.Copy(key.Positions, currentPositions, key.Positions.Length);
Position[] currentPositions = key.Positions.Select(p => (Position)p.Clone()).ToArray();
TransformeIndexes(currentPositions, key.MatrixOrder);
for (var i = 0; i < message.Length; i++)
{
// учесть первый поворот
if (i != 0 && i % currentPositions.Length == 0)
TurnPositions(currentPositions);
var position = currentPositions[i % currentPositions.Length];
ElementAction(position);
}
}
public string Encrypt(string message, CardanGrilleKey key)
{
matrixSize = (key.MatrixOrder * key.MatrixOrder) / 4 * 4;
var additionalTable = message.Length % matrixSize == 0 ? 0 : 1;
var encryptMessageSize = (message.Length / matrixSize + additionalTable) * matrixSize;
encryptMessage = new TableMessage(new string('_', encryptMessageSize), key.MatrixOrder);
this.message = message;
messagePosition = 0;
Travel(message, key);
return encryptMessage.Result;
}
private void encryptButton_Click(object sender, EventArgs e)
{
if (cipherSelectBox.SelectedIndex == 0)
{
var key = (int)keyBox.Value;
var message = sourceTextBox.Text;
var encryptedMessage = new AffineCipher().Encrypt(message, key);
processedTextBox.Text = encryptedMessage;
}
else
{
var key = new CardanGrilleKey()
{
MatrixOrder = (int)keyBox.Value,
Positions = currentKeyGrille.Select(p => new Position(p.X, p.Y)).ToArray()
};
var message = sourceTextBox.Text;
var encryptedMessage = new CardanGrilleCipher().Encrypt(message, key);
processedTextBox.Text = encryptedMessage;
}
}
