(Unicode C++) Use HTTPS Client Certificate from .cer and .key Files

Demonstrates how to load a cert + private key from .cer and .key (base64) files and use it for mutual TLS authentication (client-side certificate).

Chilkat C/C++ Library Downloads
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#include <CkHttpW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.h>
#include <CkBinDataW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttpW http;

    CkCertW cert;
    CkPrivateKeyW privKey;

    // Load any type of certificate (.cer, .p7b, .pem, etc.) by calling LoadFromFile.
    bool success = cert.LoadFromFile(L"qa_data/certs/sample_cert_a.cer");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Load the private key.
    CkBinDataW bd;
    success = bd.LoadFile(L"qa_data/certs/sample_key_a.key");
    success = privKey.LoadAnyFormat(bd,L"privateKeyPasswordIfNecessary");
    if (success != true) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    // Associate the private key with the cert.
    success = cert.SetPrivateKey(privKey);
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Set the certificate to be used for mutual TLS authentication
    // (i.e. sets the client-side certificate for two-way TLS authentication)
    success = http.SetSslClientCert(cert);
    if (success != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
    // connection will automatically use it if the server demands a client-side cert.
    }