package com.mm.util;import java.security.Security;import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;/*字符串 DESede(3DES) 加密* ECB模式/使用PKCS7方式填充不足位,目前给的密钥是192位* 3DES（即Triple DES）是DES向AES过渡的加密算法（1999年，NIST将3-DES指定为过渡的* 加密标准），是DES的一个更安全的变形。它以DES为基本模块，通过组合分组方法设计出分组加* 密算法，其具体实现如下：设Ek()和Dk()代表DES算法的加密和解密过程，K代表DES算法使用的* 密钥，P代表明文，C代表密表，这样，* 3DES加密过程为：C=Ek3(Dk2(Ek1(P)))* 3DES解密过程为：P=Dk1((EK2(Dk3(C)))* */
public class ThreeDes {/*** 3DESECB加密 * @param src 要进行了加密的原文* @param key 密钥 key必须是长度大于等于 3*8 = 24 位* @return* @throws Exception*/public static String encryptThreeDESECB(String src,String key) throws Exception{DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");SecretKey securekey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, securekey);byte[] b=cipher.doFinal(src.getBytes());BASE64Encoder encoder = new BASE64Encoder();return encoder.encode(b).replaceAll("\r", "").replaceAll("\n", "");}/*** 3DESECB解密* @param src 要解密的密文字符* @param key 解密的Key key必须是长度大于等于 3*8 = 24 位* @return* @throws Exception*/public static String decryptThreeDESECB(String src,String key) throws Exception{//--通过base64,将字符串转成byte数组BASE64Decoder decoder = new BASE64Decoder();byte[] bytesrc = decoder.decodeBuffer(src);//--解密的keyDESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");SecretKey securekey = keyFactory.generateSecret(dks);//--Chipher对象解密Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, securekey);byte[] retByte = cipher.doFinal(bytesrc);return new String(retByte);}//public static void main(String[] args) throws Exception {//密钥String key = "40EAC5391E1A4FBB4A1319BD";//添加新安全算法,如果用JCE就要把它添加进去Security.addProvider(new com.sun.crypto.provider.SunJCE());//原文String data = "ThreeDes==3==安全算法";//密文String des = ThreeDes.encryptThreeDESECB(data, key);System.out.println("加密后："+des);//解密String data2 = ThreeDes.decryptThreeDESECB(des, key);System.out.println(data2);}}