DES加密解密

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package com.yc.Tool;

import java.io.IOException;
import java.lang.reflect.Field;
import java.security.SecureRandom;

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

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

/**
* 加密工具
* Author:luojing
* 2016年6月30日上午10:25:09
*/
public class DES {
private final static String DES = “DES”;

private final static String KEY = "test1234";/** * 根据键值进行加密 * @param data  * @param key  加密键byte数组 */public static String encrypt(String data) throws Exception {    byte[] bt = encrypt(data.getBytes());    String strs = new BASE64Encoder().encode(bt);    return strs;}/** * 根据键值进行加密 * @param data * @param key  加密键byte数组 */private static byte[] encrypt(byte[] data) throws Exception {    // 生成一个可信任的随机数源    SecureRandom sr = new SecureRandom();    // 从原始密钥数据创建DESKeySpec对象    DESKeySpec dks = new DESKeySpec(KEY.getBytes());    // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);    SecretKey securekey = keyFactory.generateSecret(dks);    // Cipher对象实际完成加密操作    Cipher cipher = Cipher.getInstance(DES);    // 用密钥初始化Cipher对象    cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);    return cipher.doFinal(data);}/** * 根据键值进行解密 * @param data * @param key  加密键byte数组 */public static String decrypt(String data) throws IOException,        Exception {    if (data == null)        return null;    BASE64Decoder decoder = new BASE64Decoder();    byte[] buf = decoder.decodeBuffer(data);    byte[] bt = decrypt(buf);    return new String(bt);}/** * 根据键值进行解密 * @param data * @param key  加密键byte数组 */private static byte[] decrypt(byte[] data) throws Exception {    // 生成一个可信任的随机数源    SecureRandom sr = new SecureRandom();    // 从原始密钥数据创建DESKeySpec对象    DESKeySpec dks = new DESKeySpec(KEY.getBytes());    // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);    SecretKey securekey = keyFactory.generateSecret(dks);    // Cipher对象实际完成解密操作    Cipher cipher = Cipher.getInstance(DES);    // 用密钥初始化Cipher对象    cipher.init(Cipher.DECRYPT_MODE, securekey, sr);    return cipher.doFinal(data);}/** * 对象解密 */public static Object ObjectDecrypt(Object obj) throws Exception{    Class<? extends Object> cls = obj.getClass();    for(Field f:cls.getDeclaredFields()){        f.setAccessible(true);        Object value = f.get(obj);//得到加密参数        if(StrUtil.VObject(value) || !"password".equals(f.getName())){//值不为空,密码不需要des解密            f.set(obj, decrypt(String.valueOf(value)));//加密重新赋值        }    }    return obj;}private static String MD5="MD5";/** * MD5加密 * @return */public static String MD5(String str){    try {        MessageDigest md = MessageDigest.getInstance(MD5);        md.update(str.getBytes());        byte b[] = md.digest();        int i;        StringBuffer buf = new StringBuffer("");        for (int offset = 0; offset < b.length; offset++) {            i = b[offset];            if (i < 0)                i += 256;            if (i < 16)                buf.append("0");            buf.append(Integer.toHexString(i));        }        str = buf.toString();    } catch (Exception e) {        e.printStackTrace();    }    return str;

}

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