(MFC) Get Text Certificate Extensions by OID

See more Certificates Examples

Demonstrates how to get text certificate extensions by OID. In this example, we have a certificate with the following OID extensions: 1.3.6.1.4.1.49952.5.8.5, 1.3.6.1.4.1.49952.5.8.6, 1.3.6.1.4.1.49952.5.8.7.

Most certificate extensions have values that are ASN.1 (binary). For the majority of cases, an application should call GetExtensionAsXml. For extensions known to have text values (such as the OIDs listed above), an application can instead call GetExtensionAsText.

The GetExtensionAsText method is added in Chilkat v9.5.0.89.

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

See Also: Using MFC CString in Chilkat

#include <CkCert.h>

void ChilkatSample(void)
    {
    CkString strOut;

    CkCert cert;

    bool success = cert.LoadFromFile("qa_data/certs/PUH9.cer");
    if (success == false) {
        strOut.append(cert.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    const char *oid = "1.3.6.1.4.1.49952.5.8.5";
    const char *str = cert.getExtensionAsText(oid);
    if (cert.get_LastMethodSuccess() == true) {
        strOut.append(oid);
        strOut.append(": ");
        strOut.append(str);
        strOut.append("\r\n");
    }

    oid = "1.3.6.1.4.1.49952.5.8.6";
    str = cert.getExtensionAsText(oid);
    if (cert.get_LastMethodSuccess() == true) {
        strOut.append(oid);
        strOut.append(": ");
        strOut.append(str);
        strOut.append("\r\n");
    }

    oid = "1.3.6.1.4.1.49952.5.8.7";
    str = cert.getExtensionAsText(oid);
    if (cert.get_LastMethodSuccess() == true) {
        strOut.append(oid);
        strOut.append(": ");
        strOut.append(str);
        strOut.append("\r\n");
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }