(Unicode C++) Get Certificate User Principal Name (UPN)

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Demonstrates how to get a certificate's UPN from the SAN (Subject Alternative Name). Most certificates do not have a UPN. This example only applies to those certificates that have a User Principal Name.

Note: This example requires Chilkat v9.5.0.90 or greater due to fixes made in getting the UPN from the SAN.

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#include <CkCertW.h>
#include <CkXmlW.h>

void ChilkatSample(void)
    {
    CkCertW cert;

    bool success = cert.LoadFromFile(L"qa_data/certs/sample.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkXmlW xml;
    xml.LoadXml(cert.subjectAlternativeName());
    wprintf(L"%s\n",xml.getXml());

    // A certificate with a User Principal Name in the SAN might have this:

    // <SubjectAltName>
    //     <rfc822Name>joe@example.com</rfc822Name>
    //     <name type="oid" oid="1.3.6.1.4.1.311.20.2.3">joe@example.com</name>
    // </SubjectAltName>

    // The OID 1.3.6.1.4.1.311.20.2.3 is for the User Principal Name.
    const wchar_t *upn = xml.chilkatPath(L"/A/name,oid,1.3.6.1.4.1.311.20.2.3|*");
    if (xml.get_LastMethodSuccess() == false) {
        wprintf(L"No user principle name.\n");
    }
    else {
        wprintf(L"User Principle Name = %s\n",upn);
    }
    }