(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 <C_CkCert.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    HCkCert cert;
    BOOL success;
    HCkXml xml;
    const char *upn;

    cert = CkCert_Create();

    success = CkCert_LoadFromFile(cert,"qa_data/certs/sample.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    xml = CkXml_Create();
    CkXml_LoadXml(xml,CkCert_subjectAlternativeName(cert));
    printf("%s\n",CkXml_getXml(xml));

    // 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.
    upn = CkXml_chilkatPath(xml,"/A/name,oid,1.3.6.1.4.1.311.20.2.3|*");
    if (CkXml_getLastMethodSuccess(xml) == FALSE) {
        printf("No user principle name.\n");
    }
    else {
        printf("User Principle Name = %s\n",upn);
    }



    CkCert_Dispose(cert);
    CkXml_Dispose(xml);

    }