/*
 * DES3.java
 * Copyright (c) 2015 众信在线
 * All rights reserved.
 * ---------------------------
 * 2015年3月30日 Created
 */
package com.mango.p2p.utils;

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;

/**
 * 
 * DES3加解密
 * 
 * @author chaizhilei
 * @version 1.0 2015年3月30日
 * 
 */
public class DES3 {
	// 密钥
	private final static String secretKey = "jinrong-online.com-app-c";
	// 向量
	private final static String iv = "01234567";
	// 加解密统一使用的编码方式
	private final static String encoding = "utf-8";

	/**
	 * 3DES加密
	 * 
	 * @param plainText
	 *            普通文本
	 * @return
	 * @throws Exception
	 */
	public static String encode(String plainText) throws Exception {
		Key deskey = null;
		DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
		SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
		deskey = keyfactory.generateSecret(spec);

		Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
		IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
		cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
		byte[] encryptData = cipher.doFinal(plainText.getBytes(encoding));
		return Base64.encodeToString(encryptData, Base64.DEFAULT);
	}

	/**
	 * 3DES解密
	 * 
	 * @param encryptText
	 *            加密文本
	 * @return
	 * @throws Exception
	 */
	public static String decode(String encryptText) throws Exception {
		Key deskey = null;
		DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
		SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
		deskey = keyfactory.generateSecret(spec);
		Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
		IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
		cipher.init(Cipher.DECRYPT_MODE, deskey, ips);

		byte[] decryptData = cipher.doFinal(Base64.decode(encryptText, Base64.DEFAULT));

		return new String(decryptData, encoding);
	}

	public static void main(String[] args) {
		try {
			String jiami = encode("ABC");
			System.out.println("加密后的结果" + jiami);
			String jiemi = decode(jiami);
			System.out.println("解密结果" + jiemi);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}