Encrypt / Decrypt

Encrypt / Decrypt

import java.security.Security;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import javax.crypto.*;

import javax.swing.JOptionPane;

public class Main extends javax.swing.JFrame {

    byte[] input;

    byte[] keyBytes = "12345678".getBytes(); // our own key

    byte[] ivBytes = "input123".getBytes();

    SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");

    IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);

    Cipher cipher;

    byte[] chiperText;

    int ctLenght;

    /**

     * Creates new form Main

     */

    public Main() {

        initComponents();

    }

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)

{       

if (jRadioButton1.isSelected()) {

 try {

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

//type of security

     input = txtTest.getText().getBytes();

     SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");

     IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);

     cipher = Cipher.getInstance("DES/CTR/NoPadding", "BC");

//CTR of encryption      

     cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);

     chiperText = new byte[cipher.getOutputSize(input.length)];

     ctLenght = cipher.update(input, 0, input.length, chiperText, 0);

     ctLenght += cipher.doFinal(chiperText, ctLenght);

     jLabel2.setText(new String(chiperText));

                               

     } catch (Exception e) {

                JOptionPane.showMessageDialog(null, e);

}

 }

 if (jRadioButton2.isSelected()) {

    try {

 

  cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);

  byte[] plainText = new byte[cipher.getOutputSize(ctLenght)];

  int ptLength = cipher.update(chiperText, 0, ctLenght, plainText, 0);

  ptLength += cipher.doFinal(plainText, ptLength);

  jLabel2.setText(new String(plainText));

 

   } catch (Exception e) {

          JOptionPane.showMessageDialog(null, e);

   }

 }

 }

Lins

http://www.itcsolutions.eu/2011/08/24/how-to-encrypt-decrypt-files-in-java-with-aes-in-cbc-mode-using-bouncy-castle-api-and-netbeans-or-eclipse/

http://www.programcreek.com/java-api-examples/index.php?api=javax.crypto.spec.SecretKeySpec

http://mrbool.com/encrypting-and-decrypting-content-with-java/24843

http://www.bouncycastle.org/latest_releases.html