package com.gimi.common.cinema.utils;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;

/**
 * 3DES加密工具类
 * 
 * @author liufeng 
 * @date 2012-10-11
 */
public class Des3 {
	// 密钥
//	private final static String secretKey = "liuyunqiang@lx100$#365#$";
//	private final static String secretKey = "xgimi_@$xgimi_@$xgimi_@$";
	private final static String secretKey = "xgimi_qing#ling$ying@ka@";

	// 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.encode(encryptData);
	}

	/**
	 * 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("DES/CBC/PKCS5Padding");
		IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
		cipher.init(Cipher.DECRYPT_MODE, deskey, ips);

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

		return new String(decryptData, encoding);
	}
}