Zig

Add a Document Timestamp Signature to an already-signed PDF

See more PDF Signatures Examples

Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

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 pdf = try chilkat.Pdf.init();
    defer pdf.deinit();

    // Load the PDF that has already been signed.
    pdf.loadFile("qa_data/pdf/helloWorld_signed.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    const json = try chilkat.JsonObject.init();
    defer json.deinit();

    json.updateBool("invisibleSignature", true) catch {};
    json.updateString("subFilter", "/ETSI.RFC3161") catch {};

    json.updateBool("timestampToken.enabled", true) catch {};

    // In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
    json.updateString("timestampToken.tsaUrl", "http://timestamp.digicert.com") catch {};

    // If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
    json.updateString("timestampToken.tsaUsername", "the_tsa_username") catch {};
    json.updateString("timestampToken.tsaPassword", "the_tsa_password") catch {};

    // When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
    // This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
    // has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
    json.updateBool("timestampToken.requestTsaCert", true) catch {};

    pdf.signPdf(json, "c:/temp/qa_output/helloWorld_signed_2.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Successfully added a Document Timestamp Signature to the PDF\n", .{});
}