Unicode C

Socket TLS Mutual Authentication (Client-Side Certificate)

See more Socket/SSL/TLS Examples

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. Unicode C

#include <C_CkSocketW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocketW sock;
    BOOL bTls;
    int port;
    int maxWaitMs;

    success = FALSE;

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

    sock = CkSocketW_Create();

    // Set the certificate to be used for mutual TLS authentication
    // (i.e. sets the client-side certificate for two-way TLS authentication)
    success = CkSocketW_SetSslClientCertPfx(sock,L"/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx",L"pfxPassword");
    if (success != TRUE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        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).
    bTls = TRUE;
    port = 443;
    maxWaitMs = 5000;
    success = CkSocketW_Connect(sock,L"www.example.com",port,bTls,maxWaitMs);
    if (success != TRUE) {
        wprintf(L"Connect Failure Error Code: %d\n",CkSocketW_getConnectFailReason(sock));
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        return;
    }

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

    // ...
    // ..


    CkSocketW_Dispose(sock);

    }