Java implement Data encryption standard (DES)

Program to implement Data encryption standard (DES)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.xml.bind.annotation.

adapters.HexBinaryAdapter;

public class DES {

  private Cipher cipher = null;
  private DESKeySpec keySpec = null;
  private SecretKeyFactory keyFactory = null;

  public String encrypt(String inputString,
        String commonKey) throws Exception {

    String encryptedValue = "";
    SecretKey key = getSecretKey(commonKey);
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] inputBytes = inputString.getBytes();
    byte[] outputBytes = cipher.doFinal(inputBytes);
    encryptedValue = new HexBinaryAdapter().marshal(outputBytes);
    return encryptedValue;
  }

  public String decrypt(String encryptedString,
        String commonKey) throws Exception {
    String decryptedValue = "";
    encryptedString = encryptedString.replace(' ', '+');
    SecretKey key = getSecretKey(commonKey);
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] recoveredBytes = null;
    try {
      recoveredBytes =
          cipher.doFinal
            (new HexBinaryAdapter().unmarshal(encryptedString));
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  
    decryptedValue = new String(recoveredBytes);
    return decryptedValue;
  }

  private SecretKey getSecretKey(String secretPassword) {
    SecretKey key = null;
    try {
      cipher = Cipher.getInstance("DES");
      keySpec = new DESKeySpec
          (secretPassword.getBytes("UTF8"));
      keyFactory = SecretKeyFactory.getInstance("DES");
      key = keyFactory.generateSecret(keySpec);
    } catch (Exception e) {
      e.printStackTrace();
      System.out.println
        ("Error in generating the secret Key");
    }
    return key;
  }

  public static void main(String[] args) {
    BufferedReader reader;
    reader = new BufferedReader
        (new InputStreamReader(System.in));
    DES des = new DES();
  
    try {
      System.out.println
      ("ENCRYPTION --------------------------------");
      System.out.print("Enter Plain Message: ");
      String input = reader.readLine();
    
      System.out.print("Enter Key: ");
      String key = reader.readLine();
      System.out.println();
    
      System.out.print("Encrypted Message: ");
      String encrypted = des.encrypt(input, key);
      System.out.println(encrypted);
      System.out.println();
      System.out.println();
    
      System.out.println
      ("DECRYPTION --------------------------------");
      System.out.print("Enter Encrypted Message: ");
      encrypted = reader.readLine();
    
      System.out.print("Enter Key: ");
      key = reader.readLine();
      System.out.println();

      System.out.print("Decrypted Message: ");
      String decrypted = des.decrypt(encrypted, key);
      System.out.println(decrypted);
      System.out.println();
    
    } catch (Exception e) {
      e.printStackTrace();
    }
  
  }

}

Output:

ENCRYPTION-----------------------------------------------------------------------------------------

enter plain message: hello world (f.e)

Enter key: DonkeyKongCountry

 Encrypted message: 18FCD0F55D04602E564E35C1BC1BC1107A

DECRYPTION:---------------------------------------------------------------------------------------

Enter Encrypted Message:

18FCD0F55D04602E564E35C1BC1BC1107A

Enter Key: DonkeyKongCountry

Decrypted Message: Hello World