package com.study;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class Md5Test {

	public static String encodeByMD5(String userPwd){

		String pwdByMd5 = "";

		try {

			MessageDigest md5 = MessageDigest.getInstance("MD5");

			byte[] bytePwd = md5.digest(userPwd.getBytes());

			StringBuffer hexValue = new StringBuffer();  

			 for (int i = 0; i < bytePwd.length; i++) {

				 int val = ((int) bytePwd[i]) & 0xff;

				 if (val < 16)

					 hexValue.append("0");

				 hexValue.append(Integer.toHexString(val));

			 }

			 pwdByMd5 = hexValue.toString();

		} catch (NoSuchAlgorithmException e) {

			e.printStackTrace();

		}

		return pwdByMd5;

	}

	 /**

        * 验证输入的密码是否正确

        * @param password    加密后的密码

        * @param inputString    输入的字符串

        * @return    验证结果，TRUE:正确 FALSE:错误

		*/

		public static boolean validatePassword(String password, String inputString){

			if(password.equals(encodeByMD5(inputString))){

		         return true;

		    } else{

		         return false;

		    }

	    }  

}