package com.hehenian.biz.common.util;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FileUtils;

/**
 * MD5工具类
 * 
 * @author liuzgmf
 *
 */
public class Md5Utils {

	private static final String sv = "0plo98ikmju76yhnbgt54rfvcde32wsxzaq1";
	
    /**
     * 给文件 md5
     * @param file
     * @return  
     * @author: zhangyunhmf
     * @date: 2014年10月17日下午3:48:33
     */
    public static String getMd5ByFile(File file) {
        try {
            return DigestUtils.md5Hex(FileUtils.readFileToByteArray(file));
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }
 

	
	/**
	 * MD5 摘要，使用系统缺省字符集编码
	 * 
	 * @param input
	 * @return
	 */
	public static String MD5(String input) {
		return MD5(input, Charset.defaultCharset());
	}

	/**
	 * MD5 摘要
	 * 
	 * @param input
	 * @param charset
	 * @return
	 */
	public static String MD5(String input, String charset) {
		return MD5(input, Charset.forName(charset));
	}

	/**
	 * MD5 摘要
	 * 
	 * @param input
	 * @param charset
	 * @return
	 */
	public static String MD5(String input, Charset charset) {
		MessageDigest md = null;

		try {
			md = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}

		md.update(input.getBytes(charset));

		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		byte tmp[] = md.digest();
		char str[] = new char[16 * 2];

		int k = 0;
		for (int i = 0; i < 16; i++) {
			byte byte0 = tmp[i];
			str[k++] = hexDigits[byte0 >>> 4 & 0xf];
			str[k++] = hexDigits[byte0 & 0xf];
		}

		String result = new String(str);

		return result;
	}
	
	

	/**
	 * 用MD5算法进行加密
	 * 
	 * @param pStrPW
	 *            待被加密的字符串
	 * @return 加密后的字符串
	 */
	public static String crypt(String pStrPW) {
		String strCrypt = hash(pStrPW);
		if (strCrypt.length() > 0) {
			strCrypt += sv;
			strCrypt = hash(strCrypt);
		}

		return strCrypt;
	}

	/**
	 * MD5算法进行散列
	 * 
	 * @param str
	 *            待散列的字符串
	 * @return 散列后的字符串
	 */
	public static String hash(String str) {
		String result = "";
		if (str == null) { // 如果传入参数为空，则返回空字符串
			return result;
		}
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			byte[] data = str.getBytes();
			int l = data.length;
			for (int i = 0; i < l; i++) {
				md.update(data[i]);
			}
			byte[] digest = md.digest();

			result = ByteUtils.byteArrayToHexString(digest);
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException(e.getMessage(), e);
		}

		return result;
	}

	/**
	 * 验证MD5加签， 验证加签是否正确
	 * 
	 * @param sign
	 *            传入的加签字符
	 * @param secret
	 *            密匙
	 * @param signString
	 *            被加签字符串
	 * @return
	 */
	public static boolean checkMD5(String sign, String secret, String signString) {
		String md5Sign = Md5Utils.MD5(signString + secret, "UTF-8");
		if (md5Sign.equals(sign)) {
			return true;
		} else {
			return false;
		}
	}

    public static void main(String args[]) {
		//String pwd = "123456";
		String pwd = "/1.0/auth?key=3&ts=1414991037&ve=1.0.0&secret=%21%40%23JSD";
		if (args != null && args.length > 0) {
			pwd = args[0];
		}

		try {
            // System.out.println(Md5Utils.hash(pwd));
            // System.out.println(Md5Utils.crypt(pwd));
            // System.out.println(Md5Utils.MD5(pwd,"UTF-8"));
			
            System.out.println(getMd5ByFile(new File("C:/Temp/放款/publish_template2014-11-01-20141117.xls")));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

    public static void main1(String[] args) {
		String s = "userId125orderSN3reqTime1499999";
		String sign = "501ad0ba7a170317663e6c4fdab0a8a4";
		String cecret = "DJKC#$%CD%des$";
		System.out.println(checkMD5(sign, cecret, s));
	}
}