<?php

function decrypt($str){
        $key = 'etoroMailSys1';
        #$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $str, MCRYPT_MODE_CBC, md5(md5($ke$
        $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($encrypted), MCRYPT_MODE_CBC,$
        return $decrypted;
}

function encrypt($str){
        $key = 'etoroMailSys1';
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $str, MCRYPT_MODE_CBC, md5(md5($key$
        return $encrypted;
}

echo $pass = decrypt('HelloWorld');

echo $dec  = decrypt($pass);