Rust

Get Certificate User Principal Name (UPN)

See more Certificates Examples

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.

Rust

let cert = chilkat::Cert::new();

if cert.load_from_file("qa_data/certs/sample.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

let xml = chilkat::Xml::new();
let _ = xml.load_xml(&cert.subject_alternative_name());
println!("{}", xml.get_xml().unwrap_or_default());

// 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.
let upn = xml.chilkat_path("/A/name,oid,1.3.6.1.4.1.311.20.2.3|*").unwrap_or_default();
if !xml.last_method_success() {
    println!("No user principle name.");
} else {
    println!("User Principle Name = {}", upn);
}