/// <reference types="node" />
import tls from 'tls';
import { DaemonServer } from './types';
/**
 * Retrieves the SSL/TLS certificate from a specified DB2 server.
 *
 * This function establishes a secure connection to the server and retrieves the peer certificate
 * information, which includes details about the server's SSL/TLS certificate.
 *
 * @param server - An object containing the server details, including the host and port.
 * @returns A promise that resolves to the detailed peer certificate information.
 * @throws An error if the connection fails or if there is an issue retrieving the certificate.
 */
export declare function getCertificate(server: DaemonServer): Promise<tls.DetailedPeerCertificate>;
/**
 * This function returns the root certificate in the certificate chain which can be used
 * as the trusted CA certificate when creating the secure connection.
 *
 * It returns undefined when the root certificate is a publicly trusted CA. So it will not
 * override the default trusted CA certificate for secure connection to eliminate the potential
 * security attacks which are caused by always trusting the certificate returned by the server.
 *
 * @param server - An object containing the server details, including the host and port.
 * @returns A promise that resolves to a X.509 certificate with PEM format
 */
export declare function getRootCertificate(server: DaemonServer): Promise<string | undefined>;
export declare function isSameCertificate(subject: tls.Certificate, issuer: tls.Certificate): boolean;