Zig

Load Certificate from Smart Card by Key Usage

See more Certificates Examples

You may have a smartcard or USB token that contains only 2 certificates, one for signing, and one for authentication, and you wish to load the certificate for signing. This example demonstrates how to load the 1st certificate found on a smartcard that matches the intended key usage. 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 cert = try chilkat.Cert.init();
    defer cert.deinit();

    // If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
    cert.setSmartCardPin("12345678");

    // To load a certificate matching an intended key usage, specify the type of usage as shown below.
    //
    // The possible key usage keywords are:
    //
    // digitalsignature
    // Use when the public key is used with a digital signature mechanism to support security services other than non-repudiation, certificate signing, or CRL signing.
    // A digital signature is often used for entity authentication and data origin authentication with integrity.

    // nonrepudiation
    // When a digital certificate's key usage includes "nonrepudiation," it implies that the certificate and its associated private key can be used to
    // create digital signatures that provide proof of the origin and integrity of the signed data, and the signer cannot later deny having signed the data.

    // Other less common usages:

    // certificatesigning
    // keyencipherment
    // dataencipherment
    // crlsigning
    // secureemail
    // serverauthentication
    // clientauthentication
    // codesigning
    // timestamping

    cert.loadFromSmartcard("keyusage=nonrepudiation") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        std.debug.print("Certificate not loaded.\n", .{});
        return;
    };

    std.debug.print("Found: {s} serial={s}\n", .{ try cert.getSubjectDN(alloc), try cert.getSerialNumber(alloc) });
}