Zig

Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

See more ScMinidriver Examples

Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

Note: This example only works on Windows. ScMinidriver is a Windows-specific smart card and USB token minidriver that enables smart card authentication and cryptographic operations within Windows operating systems.

Zig

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

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

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const scmd = try chilkat.ScMinidriver.init();
    defer scmd.deinit();

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    const reader_name = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0";
    scmd.acquireContext(reader_name) catch {
        std.debug.print("{s}\n", .{try scmd.getLastErrorText(alloc)});
        return;
    };

    // If successful, the name of the currently inserted smart card is available:
    std.debug.print("Card name: {s}\n", .{try scmd.getCardName(alloc)});

    // If desired, perform regular PIN authentication with the smartcard.
    // For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
    const retval = scmd.pinAuthenticate("user", "000000");
    if (retval != 0) {
        std.debug.print("PIN Authentication failed.\n", .{});
    }

    // You can find a cerficate using any of the following certificate parts:
    // "subjectDN" -- The full distinguished name of the cert.
    // "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
    // "subjectCN" -- The common name part (CN) of the certificate's subject.
    // "serial" -- The certificate serial number.
    // "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
    // These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
    // See List Certificates on Smart Card Example
    const cert_part = "subjectCN";
    const part_value = "BadSSL Client Certificate";

    // If the certificate is found, it is loaded into the cert object.
    // Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    scmd.findCert(cert_part, part_value, cert) catch {
        std.debug.print("Failed to find the certificate.\n", .{});
        scmd.deleteContext() catch {};
        return;
    };

    std.debug.print("Successfully loaded the cert object from the smart card / USB token.\n", .{});

    // Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
    // The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
    // If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
    // because the smart card ScMinidriver session will no longer be authenticated or deleted.

    // ------------------------------------------------------------------------------------------------------------

    // Send an HTTPS request to https://client.badssl.com
    // https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates.
    // The client certificate can be downloaded from https://badssl.com/download/.
    // This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

    const http = try chilkat.Http.init();
    defer http.deinit();

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    http.setSslClientCert(cert) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        scmd.deleteContext() catch {};
        return;
    };

    const response_body = http.quickGetStr(alloc, "https://client.badssl.com/") catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        scmd.deleteContext() catch {};
        return;
    };

    std.debug.print("Response status code: {d}\n", .{http.getLastStatus()});
    std.debug.print("Response body: \n", .{});
    std.debug.print("{s}\n", .{response_body});

    // ------------------------------------------------------------------------------------------------------------
    // Cleanup our ScMinidriver session...

    // When finished with operations that required authentication, you may if you wish, deauthenticate the session.
    scmd.pinDeauthenticate("user") catch {
        std.debug.print("{s}\n", .{try scmd.getLastErrorText(alloc)});
    };

    // Delete the context when finished with the card.
    scmd.deleteContext() catch {
        std.debug.print("{s}\n", .{try scmd.getLastErrorText(alloc)});
    };
}