求用固定密钥的AES加密算法

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.security.AlgorithmParameters;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;



import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;



import org.apache.commons.codec.binary.Base64;



public class EncryptSample {



 public static void main(String[] args) throws Exception {

     String key = "aaaaaaaaaabbbbbb"; // <-128bit key

     byte[] keyBytes = key.getBytes(); // 



     byte[] enBytes = EncryptSample.encryptECB("abcdefg hijklmn".getBytes(),

       keyBytes); // "abcdefg hijklmn" key

     // System.out.println(new String(enBytes));



     byte[] deBytes = EncryptSample.decryptECB(enBytes, keyBytes);

     // 



     System.out.println(new String(deBytes));



     // 

     byte[] bs = Base64.encodeBase64(enBytes, false);

     System.out.println(new String(bs));



 }





 public static byte[] encryptECB(byte[] data, byte[] secret_key) {



     SecretKeySpec sKey = new SecretKeySpec(secret_key, "AES");

     try {

      Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

      cipher.init(Cipher.ENCRYPT_MODE, sKey);

      return cipher.doFinal(data);



     } catch (NoSuchAlgorithmException e) {

      e.printStackTrace();

     } catch (NoSuchPaddingException e) {

      e.printStackTrace();

     } catch (InvalidKeyException e) {

      e.printStackTrace();

     } catch (IllegalBlockSizeException e) {

      e.printStackTrace();

     } catch (BadPaddingException e) {

      e.printStackTrace();

     }

     return new byte[0];

 }



 public static byte[] decryptECB(byte[] encData, byte[] secret_key) {



     SecretKeySpec sKey = new SecretKeySpec(secret_key, "AES");

     try {

      Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

      cipher.init(Cipher.DECRYPT_MODE, sKey);

      return cipher.doFinal(encData);

     } catch (NoSuchAlgorithmException e) {

      e.printStackTrace();

     } catch (NoSuchPaddingException e) {

      e.printStackTrace();

     } catch (InvalidKeyException e) {

      e.printStackTrace();

     } catch (IllegalBlockSizeException e) {

      e.printStackTrace();

     } catch (BadPaddingException e) {

      e.printStackTrace();

     }

     return new byte[0];

 }

}