package com.hdu.encode;

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。

*/

// a0b891c2d563e4f7

private String sKey = "abcdef0123456789";

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){

String result = "";

try {

Cipher 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"));

result = new BASE64Encoder().encode(encrypted);

} catch (Exception e) {

e.printStackTrace();

}

// 此处使用BASE64做转码。

return result;

}

// 解密

public String decrypt(String sSrc){

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) {

ex.printStackTrace();

return null;

}

}

public static void main(String[] args){

// 需要加密的字串

String cSrc = "测试";

System.out.println(cSrc + " 长度为" + cSrc.length());

// 加密

long lStart = System.currentTimeMillis();

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

System.out.println("加密后的字串是：" + enString + "长度为" + enString.length());

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");

}

}