function encrypt ($key, $data, $iv)
{
        return mcrypt_encrypt (MCRYPT_BLOWFISH, $key, $data, MCRYPT_MODE_CBC, $iv);
}

function decrypt ($key, $data, $iv)
{
        return mcrypt_decrypt (MCRYPT_BLOWFISH, $key, $data, MCRYPT_MODE_CBC, $iv);
}