private void btnSymmetricGenerate_Click(object sender, EventArgs e)
{
string key = Cryptography.Symmetric.CreateKey();
WorkingDir.save(key, "tajni_kljuc.txt");
textSymmetricKey.Text = key;
textSymmetricFile.Text = WorkingDir.directory + "\\" + "tajni_kljuc.txt";
setSymmetricComponentVisibility(true);
}
private void btnAsymmetricGenerate_Click(object sender, EventArgs e)
{
//generate keys
Cursor.Current = Cursors.WaitCursor;
Cryptography.Asymmetric.CreateKeys(out var publicKey, out var privateKey);
richTextAsymmetricPrivateKey.Text = privateKey;
richTextAsymmetricPublicKey.Text = publicKey;
Cursor.Current = Cursors.Default;
//write to file
WorkingDir.save(privateKey, "privatni_kljuc.txt");
WorkingDir.save(publicKey, "javni_kljuc.txt");
textAsymmetricPrivateFile.Text = WorkingDir.directory + "\\" + "privatni_kljuc.txt";
textAsymmetricPublicFile.Text = WorkingDir.directory + "\\" + "javni_kljuc.txt";
setAsymmetricComponentVisibility(true);
}
private void btnCalculateHash_Click(object sender, EventArgs e)
{
if (fileName != null)
{
string rawData = File.ReadAllText(fileName);
string readableHash = Cryptography.Hash.ConvertHashToString(Cryptography.Hash.Calculate(rawData));
textHash.Text = readableHash;
WorkingDir.save(readableHash, "hash.txt");
}
else
{
string message = "Niste odabrali datoteku!";
string caption = "Input Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
private void btnSignDigitally_Click(object sender, EventArgs e)
{
toggleComponents(false);
if (originalFile != null && privateKey != null)
{
string fileContent = File.ReadAllText(originalFile);
string pKey = File.ReadAllText(privateKey);
try
{
string digitalSignature = Convert.ToBase64String(Cryptography.DigitalSignature.Sign(fileContent, pKey));
WorkingDir.save(digitalSignature, "digitalni_potpis.txt");
labelSignatureStatus.Text = "Datoteka uspješno potpisana!";
labelSignatureStatus.ForeColor = Color.Green;
textFilePath.Text = WorkingDir.directory + "\\" + "digitalni_potpis.txt";
toggleComponents(true);
}
catch (Exception ex)
{
if (ex is CryptographicException || ex is System.FormatException)
{
string message = "Ključ ili datoteka nisu valjani!";
string caption = "Signature Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
else
{
string message = "Dogodila se greška, pokušajte ponovo!";
string caption = "Unknown Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
}
else
{
string message = "Niste učitali sve potrebne podatke za potpisivanje!";
string caption = "Input Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
private void btnSymmetricDecrypt_Click(object sender, EventArgs e)
{
richTextDecryptedFile.Text = "";
if (encryptedFile != null && keyFile != null)
{
byte[] fileContent = Convert.FromBase64String(File.ReadAllText(encryptedFile));
byte[] key = Convert.FromBase64String(File.ReadAllText(keyFile));
try
{
string decryptedContent = Cryptography.Symmetric.Decrypt(fileContent, key);
WorkingDir.save(decryptedContent, "dekriptirani_tekst_simetricni.txt");
richTextDecryptedFile.Text = decryptedContent;
textDecryptedPath.Text = WorkingDir.directory + "\\" + "dekriptirani_tekst_simetricni.txt";
}
catch (Exception ex)
{
if (ex is CryptographicException || ex is System.FormatException)
{
string message = "Ključ ili datoteka nisu valjani!";
string caption = "Decrypt Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
else
{
string message = "Dogodila se greška, pokušajte ponovo!";
string caption = "Unknown Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
}
else
{
string message = "Niste učitali sve potrebne podatke za dekriptiranje!";
string caption = "Input Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
private void btnAsymmetricEncrypt_Click(object sender, EventArgs e)
{
if (originalFile != null && publicKey != null)
{
string fileContent = File.ReadAllText(originalFile);
string pKey = File.ReadAllText(publicKey);
try
{
byte[] encryptedContent = Cryptography.Asymmetric.Encrypt(fileContent, pKey);
WorkingDir.save(Convert.ToBase64String(encryptedContent), "kriptirani_tekst_asimetricni.txt");
richTextEncryptedFile.Text = Convert.ToBase64String(encryptedContent);
textEncryptedPath.Text = WorkingDir.directory + "\\" + "kriptirani_tekst_asimetricni.txt";
}
catch (Exception ex)
{
if (ex is CryptographicException || ex is System.FormatException)
{
string message = "Ključ ili datoteka nisu valjani!";
string caption = "Encrypt Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
else
{
string message = "Dogodila se greška, pokušajte ponovo!";
string caption = "Unknown Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}
}
else
{
string message = "Niste učitali sve potrebne podatke za kriptiranje!";
string caption = "Input Error";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBox.Show(message, caption, buttons);
}
}