Lua Requires Chilkat v9.5.0.90+

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. Lua

local chilkat = require("chilkat")

local cert = chilkat.Cert.new()

local success = cert:load_from_file("qa_data/certs/sample.cer")
if not success then
    print(cert.last_error_text)
    return
end

local xml = chilkat.Xml.new()
xml:load_xml(cert.subject_alternative_name)
print(xml:get_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.
local upn = xml:chilkat_path("/A/name,oid,1.3.6.1.4.1.311.20.2.3|*")
if not xml.last_method_success then
    print("No user principle name.")
else
    print("User Principle Name = " .. upn)
end