(MFC) 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.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSocket.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket sock;

    // Set the certificate to be used for mutual TLS authentication
    // (i.e. sets the client-side certificate for two-way TLS authentication)
    bool success = sock.SetSslClientCertPfx("/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx","pfxPassword");
    if (success != true) {
        strOut.append(sock.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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).
    bool bTls = true;
    int port = 443;
    int maxWaitMs = 5000;
    success = sock.Connect("www.example.com",port,bTls,maxWaitMs);
    if (success != true) {
        strOut.append("Connect Failure Error Code: ");
        strOut.appendInt(sock.get_ConnectFailReason());
        strOut.append("\r\n");
        strOut.append(sock.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

    // ...
    // ..


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }