public function generatePassword($master_password, $login, $domain, $password_length=16, $hash_algo='sha256')
        {
            $auth_string = $login.'@'.$domain;
            $hashed_master_password = substr(hash($hash_algo, $master_password, false), 0, $password_length);
            $encrypted_long_password = base64_encode(hash($hash_algo, $auth_string . $hashed_master_password, false) . $hashed_master_password);
            $encrypted_trimmed_password = substr($encrypted_long_password, 0, $password_length);

            return $encrypted_trimmed_password;
        }