import javax.crypto.Cipher;

 import javax.crypto.spec.IvParameterSpec;

 import javax.crypto.spec.SecretKeySpec;

 import sun.misc.BASE64Decoder;

 import sun.misc.BASE64Encoder;

 /**AES 是一种可逆加密算法，对用户的敏感信息加密处理

 * 对原始数据进行AES加密后，在进行Base64编码转化；

 */

 public class AESOperator {

 /*

 * 加密用的Key 可以用26个字母和数字组成

 * 此处使用AES-128-CBC加密模式，key需要为16位。

 */

 private String sKey=”0123456789abcdef”;

 private String ivParameter=”0123456789abcdef”;

 private static AESOperator instance=null;

 private AESOperator(){

 }

 public static AESOperator getInstance(){

 if (instance==null)

 instance= new AESOperator();

 return instance;

 }

 // 加密

 public String encrypt(String sSrc) throws Exception {

 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);

 byte[] raw = sKey.getBytes();

 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);

 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度

 cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

 byte[] encrypted = cipher.doFinal(sSrc.getBytes(“utf-8″));

 return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。

 }

 // 解密

 public String decrypt(String sSrc) throws Exception {

 try {

 byte[] raw = sKey.getBytes(“ASCII”);

 SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”);

 Cipher cipher = Cipher.getInstance(“AES/CBC/PKCS5Padding”);

 IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());

 cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

 byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密

 byte[] original = cipher.doFinal(encrypted1);

 String originalString = new String(original,”utf-8″);

 return originalString;

 } catch (Exception ex) {

 return null;

 }

 }

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

 // 需要加密的字串

 String cSrc = “我来自www.wenhq.com”;

 System.out.println(cSrc);

 // 加密

 long lStart = System.currentTimeMillis();

 String enString = AESOperator.getInstance().encrypt(cSrc);

 System.out.println(“加密后的字串是：” + enString);

 long lUseTime = System.currentTimeMillis() – lStart;

 System.out.println(“加密耗时：” + lUseTime + “毫秒”);

 // 解密

 lStart = System.currentTimeMillis();

 String DeString = AESOperator.getInstance().decrypt(enString);

 System.out.println(“解密后的字串是：” + DeString);

 lUseTime = System.currentTimeMillis() – lStart;

 System.out.println(“解密耗时：” + lUseTime + “毫秒”);

 }

 }

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