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    if (!empty($db_password_hash))
    {
        $sha1_in_db = (strlen($db_password_hash) == 40) ? true : false;
        $sha1_available = (function_exists('sha1') || function_exists('mhash')) ? true : false;

        $form_password_hash = pun_hash($form_password);    // This could result in either an SHA-1 or an MD5 hash (depends on $sha1_available)

        if ($sha1_in_db && $sha1_available && $db_password_hash == $form_password_hash)
            $authorized = true;
        else if (!$sha1_in_db && $db_password_hash == md5($form_password))
        {
            $authorized = true;

            if ($sha1_available)    // There's an MD5 hash in the database, but SHA1 hashing is available, so we update the DB
                $db->query('UPDATE '.$db->prefix.'users SET password=\''.$form_password_hash.'\' WHERE id='.$user_id) or error('Unable to update user password', __FILE__, __LINE__, $db->error());
        }
    }