import java.security.*;
import javax.crypto.*;

//
// encrypt and decrypt using the DES private key algorithm

public class PrivateExample {

   public static void main(String[] args) throws Exception {
      //
      // check args and get plaintext
      if (args.length != 1) {
         System.err.println("Usage: java PrivateExample text");
         System.exit(1);
      }

//    byte[] plainText = args[0].getBytes("UTF8");
      String ss = "Hello world, haris is here!";
      byte[] plainText = ss.getBytes();
      //
      // get a DES private key
      System.out.println("\nStart generating DES key");
      KeyGenerator keyGen = KeyGenerator.getInstance("DES");
      keyGen.init(56);
      Key key = keyGen.generateKey();
      System.out.println("Finish generating DES key");
      //
      // get a DES cipher object and print the provider
      Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
      System.out.println("\n" + cipher.getProvider().getInfo());
      //
      // encrypt using the key and the plaintext
      System.out.println("\nStart encryption");
      cipher.init(Cipher.ENCRYPT_MODE, key);
      byte[] cipherText = cipher.doFinal(plainText);
      System.out.println("Finish encryption: ");
      System.out.println(new String(cipherText, "UTF8"));

      //
      // decrypt the ciphertext using the same key
      System.out.println("\nStart decryption");
      cipher.init(Cipher.DECRYPT_MODE, key);
      byte[] newPlainText = cipher.doFinal(cipherText);
      System.out.println("Finish decryption: ");

      System.out.println(new String(newPlainText, "UTF8"));
   }
}