Шифрование

public class NewJFrame extends javax.swing.JFrame {
 
    // encryption decryption //
    byte[] input;
    byte[] keyBytes = "12345678".getBytes();
    byte[] ivBytes = "input123".getBytes();
    SecretKeySpec key;// = new SecretKeySpec(keyBytes, "DES");
    IvParameterSpec ivSpec;// = new IvParameterSpec(ivBytes);
    Cipher cipher;
    byte[] cipherText;
    int ctLength;
    //////////////////////////
 
    public NewJFrame() {
        initComponents();
 
    }              
 
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
            input = jTextField1.getText().getBytes();
            key = new SecretKeySpec(keyBytes, "DES");
            ivSpec = new IvParameterSpec(ivBytes);
            cipher = Cipher.getInstance("DES/CTR/NoPadding", "BC");
            cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
            cipherText = new byte[cipher.getOutputSize(input.length)];
            ctLength = cipher.update(input, 0, input.length, cipherText, 0);
            ctLength += cipher.doFinal(cipherText, ctLength);
            jTextField2.setText(new String(cipherText));
        } catch (NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | ShortBufferException | IllegalBlockSizeException | BadPaddingException e) {
            JOptionPane.showMessageDialog(null, e);
        }
    }       
 
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
            byte[] plaintText = new byte[cipher.getOutputSize(ctLength)];
            int ptLenght = cipher.update(cipherText, 0, ctLength, plaintText, 0);
            ptLenght += cipher.doFinal(plaintText, ptLenght);
            jTextField3.setText(new String(plaintText));
        } catch (InvalidKeyException | InvalidAlgorithmParameterException | ShortBufferException | IllegalBlockSizeException | BadPaddingException e) {
        }
    }

try {
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
            input = jTextField2.getText().getBytes();
            key = new SecretKeySpec(keyBytes, "DES");
            ivSpec = new IvParameterSpec(ivBytes);
            cipher = Cipher.getInstance("DES/CTR/NoPadding", "BC");
            cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
            cipherText = new byte[cipher.getOutputSize(input.length)];
            ctLength = cipher.update(input, 0, input.length, cipherText, 0);
            ctLength += cipher.doFinal(cipherText, ctLength);
            jTextField3.setText(new String(cipherText));
        } catch (NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | ShortBufferException | IllegalBlockSizeException | BadPaddingException e) {
            JOptionPane.showMessageDialog(null, e);
        }