React Native

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.

React Native

import { Cert, Xml } from '@chilkat/react-native'

function chilkatExample() {
  const cert = new Cert();

  try {
    cert.loadFromFile('qa_data/certs/sample.cer');
  } catch {
    console.log(cert.lastErrorText);
    return;
  }

  const xml = new Xml();
  xml.loadXml(cert.subjectAlternativeName);
  console.log(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.
  try {
    const upn = xml.chilkatPath('/A/name,oid,1.3.6.1.4.1.311.20.2.3|*');
    console.log(`User Principle Name = ${upn}`);
  } catch {
    console.log('No user principle name.');
  }
}