Zig

Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get 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 a PDF that has cryptographic signatures to be validated
    pdf.loadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    // Each time we verify a signature, information about the signature is written into
    // sigInfo (replacing whatever sigInfo previously contained).
    const sig_info = try chilkat.JsonObject.init();
    defer sig_info.deinit();

    // Iterate over each signature and validate each.
    const num_signatures = pdf.getNumSignatures();
    var validated: bool = false;
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    var i: i32 = 0;
    while (i < num_signatures) {
        validated = if (pdf.verifySignature(i, sig_info)) true else |_| false;
        std.debug.print("Signature {d} validated: {}\n", .{ i, validated });

        // After calling VerifySignature, you can get the signer certificate by calling
        // GetSignerCert with the same index.
        if (pdf.getSignerCert(i, cert)) {
            std.debug.print("PDF signer certificate: {s}\n", .{try cert.getSubjectDN(alloc)});
        } else |_| {}

        i = i + 1;
    }

    std.debug.print("Finished.\n", .{});
}