(Lianja) 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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loCert = createobject("CkCert")

llSuccess = loCert.LoadFromFile("qa_data/certs/sample.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loCert
    return
endif

loXml = createobject("CkXml")
loXml.LoadXml(loCert.SubjectAlternativeName)
? loXml.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.
lcUpn = loXml.ChilkatPath("/A/name,oid,1.3.6.1.4.1.311.20.2.3|*")
if (loXml.LastMethodSuccess = .F.) then
    ? "No user principle name."
else
    ? "User Principle Name = " + lcUpn
endif



release loCert
release loXml