package org.yeshi.utils.encrypt;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;

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

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

public class DESUtil {
	/**
	 * [加密]DES-->BASE64-->密文
	 * 
	 * [解密]BASE64->DES-->明文
	 * 
	 * 秘钥和向量要双方约定一致
	 * 
	 * DES加密的私钥，必须是8位长的字符串
	 */
	private static AlgorithmParameterSpec iv = null;// 加密算法的参数接口，IvParameterSpec是它的一个实现
	private static Key key = null;

	static {

	}

	public static String encode(String data, String descKeyBase64, String desIVBase64) {
		try {
			DESKeySpec keySpec = new DESKeySpec(Base64.decode(descKeyBase64));
			// 设置密钥参数
			iv = new IvParameterSpec(Base64.decode(desIVBase64));// 设置向量
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
			key = keyFactory.generateSecret(keySpec);// 得到密钥对象
			System.out.println(key.toString());
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (InvalidKeySpecException e) {
			e.printStackTrace();
		}
		String result = "";
		try {
			Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
			enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
			byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8"));
			result = Base64.encode(pasByte);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	public static String decode(String data, String descKeyBase64, String desIVBase64) {
		try {
			DESKeySpec keySpec = new DESKeySpec(Base64.decode(descKeyBase64));
			// 设置密钥参数
			iv = new IvParameterSpec(Base64.decode(desIVBase64));// 设置向量
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
			key = keyFactory.generateSecret(keySpec);// 得到密钥对象
			System.out.println(key.toString());
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (InvalidKeySpecException e) {
			e.printStackTrace();
		}

		String result = "";
		Cipher deCipher;
		try {
			deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
			deCipher.init(Cipher.DECRYPT_MODE, key, iv);
			byte[] pasByte = deCipher.doFinal(Base64.decode(data));
			result = new String(pasByte, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;

	}
}