(Java) Socket TLS Mutual Authentication (Client-Side Certificate)

This example demonstrates how to provide a client-side certificate, also known as "two-way authentication" or "mutual authentication" for servers that require a client certificate.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket sock = new CkSocket();

    // Set the certificate to be used for mutual TLS authentication
    // (i.e. sets the client-side certificate for two-way TLS authentication)
    boolean success = sock.SetSslClientCertPfx("/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx","pfxPassword");
    if (success != true) {
        System.out.println(sock.lastErrorText());
        return;
        }

    // Note: The certificate used for the client-side of TLS mutual authentication
    // must have the associated private key available. (.pfx/.p12 files typically store both
    // the certificate and associated private key.)

    // Establish the connection using the socket object (with client certificate authentication).
    boolean bTls = true;
    int port = 443;
    int maxWaitMs = 5000;
    success = sock.Connect("www.example.com",port,bTls,maxWaitMs);
    if (success != true) {
        System.out.println("Connect Failure Error Code: " + sock.get_ConnectFailReason());
        System.out.println(sock.lastErrorText());
        return;
        }

    // At this point, the Socket object is connected and authenticated using the client-side cert

    // ...
    // ..
  }
}