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Get Text Certificate Extensions by OID

See more Certificates Examples

Demonstrates how to get text certificate extensions by OID. In this example, we have a certificate with the following OID extensions: 1.3.6.1.4.1.49952.5.8.5, 1.3.6.1.4.1.49952.5.8.6, 1.3.6.1.4.1.49952.5.8.7.

Most certificate extensions have values that are ASN.1 (binary). For the majority of cases, an application should call GetExtensionAsXml. For extensions known to have text values (such as the OIDs listed above), an application can instead call GetExtensionAsText.

The GetExtensionAsText method is added in Chilkat v9.5.0.89.

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/PUH9.cer") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    var oid: [:0]const u8 = "1.3.6.1.4.1.49952.5.8.5";
    var str: [:0]const u8 = cert.getExtensionAsText(alloc, oid) catch "";
    if (cert.getLastMethodSuccess()) {
        std.debug.print("{s}: {s}\n", .{ oid, str });
    }

    oid = "1.3.6.1.4.1.49952.5.8.6";
    str = try cert.getExtensionAsText(alloc, oid);
    if (cert.getLastMethodSuccess()) {
        std.debug.print("{s}: {s}\n", .{ oid, str });
    }

    oid = "1.3.6.1.4.1.49952.5.8.7";
    str = try cert.getExtensionAsText(alloc, oid);
    if (cert.getLastMethodSuccess()) {
        std.debug.print("{s}: {s}\n", .{ oid, str });
    }
}