Zig

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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const cert = try chilkat.Cert.init();
    defer cert.deinit();

    cert.loadFromFile("qa_data/certs/sample.cer") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    const xml = try chilkat.Xml.init();
    defer xml.deinit();
    xml.loadXml(try cert.getSubjectAlternativeName(alloc)) catch {};
    std.debug.print("{s}\n", .{try xml.getXml(alloc)});

    // 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.
    const upn = xml.chilkatPath(alloc, "/A/name,oid,1.3.6.1.4.1.311.20.2.3|*") catch "";
    if (!xml.getLastMethodSuccess()) {
        std.debug.print("No user principle name.\n", .{});
    } else {
        std.debug.print("User Principle Name = {s}\n", .{upn});
    }
}