DES加密 JavaDemo 案例

package com.fingerchar.core.util;

import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class DESUtil {
    //测试

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

//        byte[] result = DESUtil.encrypt("烦死你不记得哦菲律宾怒爱搜嘎互补是打发啊啊啊啊啊啊啊啊大伤脑筋服了你大数据开发好吧福克斯大V回家开始的 ".getBytes(),"password");
//
//         String s=Base64Utils.encode(result);
//         System.out.println("加密后："+s);
//        try {
//            byte[] b= Base64Utils.decode(s);
//
//            byte[] decryResult = DESUtil.decrypt(b, "password");
//            System.out.println("解密后："+new String(decryResult));
//        } catch (Exception e1) {
//            e1.printStackTrace();
//        }
        try{

            String result=encrypt("你好啊  新的一天","xxsssddd");
              String s=  decrypt(result,"xxsssddd");
            System.out.println(s);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 加密
     * @param data  需要加密的数据
     * @param password  密钥字符串
     * @return
     * @throws Exception
     */
    public static String encrypt(String data,String password) throws Exception {
         return   Base64Utils.encode(encrypt(data.getBytes(),password));
    }

    /**
     * 解密
     * @param secretData 秘文
     * @param password 密钥
     * @return
     * @throws Exception
     */
    public static String decrypt(String secretData,String password) throws Exception {
         byte[] decryResult = DESUtil.decrypt(Base64Utils.decode(secretData), password);
          return   new String(decryResult) ;
    }

    public static  byte[] encrypt(byte[] datasource, String password) {
        try{
            SecureRandom random = new SecureRandom();
            DESKeySpec desKey = new DESKeySpec(password.getBytes());
            //创建一个密匙工厂，然后用它把DESKeySpec转换成
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            //Cipher对象实际完成加密操作
            Cipher cipher = Cipher.getInstance("DES");
            //用密匙初始化Cipher对象
            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
            //现在，获取数据并加密
            //正式执行加密操作
            return cipher.doFinal(datasource);
        }catch(Throwable e){
            e.printStackTrace();
        }
        return null;
    }

    public static byte[] decrypt(byte[] src, String password) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom random = new SecureRandom();
        // 创建一个DESKeySpec对象
        DESKeySpec desKey = new DESKeySpec(password.getBytes());
        // 创建一个密匙工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // 将DESKeySpec对象转换成SecretKey对象
        SecretKey securekey = keyFactory.generateSecret(desKey);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance("DES");
        // 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, random);
        // 真正开始解密操作
        return cipher.doFinal(src);
    }

}