data-md5.php

<?php
// $encrypted = encryptIt($input);
// $decrypted = decryptIt($encrypted);

function encryptIt($q)
{
  $cryptKey = 'qJB0rGtIn5UB1xG03efyCp';
  $qEncoded = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($cryptKey), $q, MCRYPT_MODE_CBC, md5(md5($cryptKey))));
  return ($qEncoded);
}

function decryptIt($q)
{
  $cryptKey = 'qJB0rGtIn5UB1xG03efyCp';
  $qDecoded = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($cryptKey), base64_decode($q), MCRYPT_MODE_CBC, md5(md5($cryptKey))), "\0");
  return ($qDecoded);
}
?>