(Go) 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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    // 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 := "https://dl.cacerts.digicert.com/DigiCertGlobalRootG3.crt"

    http := chilkat.NewHttp()
    bdCert := chilkat.NewBinData()
    success := http.DownloadBd(certUrl,bdCert)
    if success == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        bdCert.DisposeBinData()
        return
    }

    // Load it into a Chilkat cert object.
    cert := chilkat.NewCert()
    success = cert.LoadFromBd(bdCert)
    if success == false {
        fmt.Println(cert.LastErrorText())
        http.DisposeHttp()
        bdCert.DisposeBinData()
        cert.DisposeCert()
        return
    }

    // Examine the common name,serial, and thumbprint:
    fmt.Println("CN: ", cert.SubjectCN())
    fmt.Println("Serial: ", cert.SerialNumber())
    fmt.Println("Thumbprint: ", cert.Sha1Thumbprint())

    // 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 := "qa_data/certs/DigiCertGlobalRootG3.crt"
    success = bdCert.WriteFile(certPath)

    // To load the cert from a file...
    success = cert.LoadFromFile(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 := chilkat.NewTrustedRoots()

    troots.AddCert(cert)
    troots.Activate()

    fmt.Println(cert.SubjectCN(), " is now trusted for this run of this application.")

    http.DisposeHttp()
    bdCert.DisposeBinData()
    cert.DisposeCert()
    troots.DisposeTrustedRoots()