echsop的users表password加密模式

echsop的users表password加密方式
我自己做了一個網站，但是要訪問是ecshop的users表來實現登入，但是ecshop的users密碼加密了，查看了ecshop的compile_password方法，還是不明白該怎麼使用加密這個方法。

function compile_password ($cfg)
    {
//var_dump($cfg);
       if (isset($cfg['password']))
       {
            $cfg['md5password'] = md5($cfg['password']);
       }
       if (empty($cfg['type']))
       {
            $cfg['type'] = PWD_MD5;
       }

       switch ($cfg['type'])
       {
           case PWD_MD5 :
              if(!empty($cfg['ec_salt']))
       {
       return md5($cfg['md5password'].$cfg['ec_salt']);
       }
   else
       {
                    return $cfg['md5password'];
   }

           case PWD_PRE_SALT :
               if (empty($cfg['salt']))
               {
                    $cfg['salt'] = '';
               }

               return md5($cfg['salt'] . $cfg['md5password']);

           case PWD_SUF_SALT :
               if (empty($cfg['salt']))
               {
                    $cfg['salt'] = '';
               }

               return md5($cfg['md5password'] . $cfg['salt']);

           default:
               return '';
       }
    }






$con=mysql_connect("localhost","admin","");

if (!$con){
  die('Could not connect: ' . mysql_error());
  
}
$command=mysql_select_db("yihaichao",$con);
mysql_query('SET NAMES gbk');
if(!$command){
exit('串連資料庫失敗');
}
if(!isset($_POST['submit'])){
    exit('傳值失敗');
}
$passowrd=$_POST['password'];
$username=$_POST['username'];
$passowrd=md5($password);
echo $passowrd;
if($username && $passowrd){ 
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