AES加密

   常见的加密方法有MD5、RSA、AES，今天我们来说说AES加密，没啥好说的，直接给大家上demo。

package com.ecshop.common.util;


import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class AESUtil {
    //算法
    private static final String ALGORITHM  = "AES";
    //默认的加密算法
    private static final String CIPHER_ALGORITHM  = "AES/CBC/PKCS5Padding";
    // 编码
    private static final String ENCODING = "UTF-8";
    // 密匙
    private static final String KEY = "a70648d869329dab";
    // 偏移量
    private static final String OFFSET = "0102030405060708";

    /**
     * AES加密
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        // 初始化cipher
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        //转化成JAVA的密钥格式
        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes("ASCII"), ALGORITHM);
        //使用CBC模式，需要一个向量iv，可增加加密算法的强度
        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(data.getBytes(ENCODING));
        //此处使用BASE64做转码。
        String result = new BASE64Encoder().encode(encrypted);
        return result;
    }

    /**
     * AES解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String decrypt(String data) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        SecretKeySpec skeySpec = new SecretKeySpec(KEY.getBytes("ASCII"), ALGORITHM);
        //使用CBC模式，需要一个向量iv，可增加加密算法的强度
        IvParameterSpec iv = new IvParameterSpec(OFFSET.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] buffer = new BASE64Decoder().decodeBuffer(data);
        byte[] encrypted = cipher.doFinal(buffer);
        //此处使用BASE64做转码。
        String result = new String(encrypted, ENCODING);
        return result;
    }

    public static void main(String[] args) {
        String s1 = "1122";
        String str = "";
        try {
             str = AESUtil.encrypt(s1);
            System.out.println("111111:"+str);
        } catch (Exception e) {
            e.printStackTrace();
        }

        String result = "";
        try {
            result = AESUtil.decrypt(str);
            System.out.println("222222:"+result);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}