(Unicode C) Download and Trust the DigiCert Global Root CA

Demonstrates how to download a root certificate and trust it.

For more information, see https://www.digicert.com/digicert-root-certificates.htm

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#include <C_CkHttpW.h>
#include <C_CkBinDataW.h>
#include <C_CkCertW.h>
#include <C_CkTrustedRootsW.h>

void ChilkatSample(void)
    {
    const wchar_t *certUrl;
    HCkHttpW http;
    HCkBinDataW bdCert;
    BOOL success;
    HCkCertW cert;
    const wchar_t *certPath;
    HCkTrustedRootsW troots;

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

    // In this example, the URLs for the DigiCert root CA certs are available at this web page:
    // https://www.digicert.com/digicert-root-certificates.htm

    // This example downloads the "DigiCert Global Root G3"
    // Valid until: 15/Jan/2038
    // Serial #: 05:55:56:BC:F2:5E:A4:35:35:C3:A4:0F:D5:AB:45:72
    // Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

    certUrl = L"https://dl.cacerts.digicert.com/DigiCertGlobalRootG3.crt";

    http = CkHttpW_Create();
    bdCert = CkBinDataW_Create();
    success = CkHttpW_DownloadBd(http,certUrl,bdCert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkBinDataW_Dispose(bdCert);
        return;
    }

    // Load it into a Chilkat cert object.
    cert = CkCertW_Create();
    success = CkCertW_LoadFromBd(cert,bdCert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkHttpW_Dispose(http);
        CkBinDataW_Dispose(bdCert);
        CkCertW_Dispose(cert);
        return;
    }

    // Examine the common name,serial, and thumbprint:
    wprintf(L"CN: %s\n",CkCertW_subjectCN(cert));
    wprintf(L"Serial: %s\n",CkCertW_serialNumber(cert));
    wprintf(L"Thumbprint: %s\n",CkCertW_sha1Thumbprint(cert));

    // Output from the above:
    // CN: DigiCert Global Root G3
    // Serial: 055556BCF25EA43535C3A40FD5AB4572
    // Thumbprint: 7E04DE896A3E666D00E687D33FFAD93BE83D349E

    // If desired, the certificate can be saved to a local file so it does not need
    // to be downloaded from the website every time.  
    certPath = L"qa_data/certs/DigiCertGlobalRootG3.crt";
    success = CkBinDataW_WriteFile(bdCert,certPath);

    // To load the cert from a file...
    success = CkCertW_LoadFromFile(cert,certPath);

    // Do the following to add the cert to the collection of trusted roots
    // for this application.  (Note:  The trust is not persisted.  Each time the
    // application runs, it should load the cert (from whatever source, whether it is
    // a file, a database,etc.) and do the following:
    troots = CkTrustedRootsW_Create();

    CkTrustedRootsW_AddCert(troots,cert);
    CkTrustedRootsW_Activate(troots);

    wprintf(L"%s is now trusted for this run of this application.\n",CkCertW_subjectCN(cert));


    CkHttpW_Dispose(http);
    CkBinDataW_Dispose(bdCert);
    CkCertW_Dispose(cert);
    CkTrustedRootsW_Dispose(troots);

    }