Zig Requires Chilkat v11.7.0+

Replace the Authenticode Signature of an Already Signed File

See more Code Signing Examples

Demonstrates how to sign a file that already has an Authenticode signature, for example to sign it with a renewed code signing certificate. Starting in Chilkat v11.7.0, AddSignature removes the existing signature and replaces it with the new one. Before v11.7.0, signing an already signed EXE or DLL added a second signature entry instead. 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.

    // Starting in Chilkat v11.7.0, AddSignature replaces the signature of a file that is already signed.
    // (Before v11.7.0, signing an already signed EXE or DLL added a second signature entry
    // instead of replacing the first.)
    //
    // This applies to every supported file type: EXE, DLL, MSI, PowerShell, and VBScript.

    const path = "C:/someDir/MyApp.exe";

    const code_sign = try chilkat.CodeSign.init();
    defer code_sign.deinit();
    const sig_info = try chilkat.JsonObject.init();
    defer sig_info.deinit();
    const signer_cert = try chilkat.Cert.init();
    defer signer_cert.deinit();

    // Find out who signed the file.
    if (code_sign.verifySignature(path, sig_info)) {
        code_sign.getSignerCert(signer_cert) catch {};
        std.debug.print("currently signed by: {s}\n", .{try signer_cert.getSubjectCN(alloc)});
        std.debug.print("certificate valid until: {s}\n", .{try signer_cert.getValidToStr(alloc)});
    } else |_| {
        std.debug.print("The file is not signed, or its signature is not valid.\n", .{});
    }

    // Load the certificate to sign with.  It must have access to its private key.
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    cert.loadPfxFile("C:/someDir/myNewCodeSigningCert.pfx", "pfx password") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Sign with SHA256, and ask a timestamp authority for a timestamp.  A timestamp lets the
    // signature continue to validate after the code signing certificate has expired.
    //
    // {
    //   "hashAlg": "sha256",
    //   "timestampToken": {
    //     "enabled": true,
    //     "tsaUrl": "http://timestamp.digicert.com",
    //     "requestTsaCert": true,
    //     "hashAlg": "sha256"
    //   }
    // }
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateString("hashAlg", "sha256") catch {};
    json.updateBool("timestampToken.enabled", true) catch {};
    json.updateString("timestampToken.tsaUrl", "http://timestamp.digicert.com") catch {};
    json.updateBool("timestampToken.requestTsaCert", true) catch {};
    json.updateString("timestampToken.hashAlg", "sha256") catch {};

    // Sign the file.  It is not necessary to call RemoveSignature first:
    // the existing signature is removed and the new signature takes its place.
    code_sign.addSignature(path, cert, json) catch {
        std.debug.print("{s}\n", .{try code_sign.getLastErrorText(alloc)});
        return;
    };

    // The file now has one signature, made with the new certificate.
    code_sign.verifySignature(path, sig_info) catch {
        std.debug.print("{s}\n", .{try code_sign.getLastErrorText(alloc)});
        return;
    };

    code_sign.getSignerCert(signer_cert) catch {
        std.debug.print("{s}\n", .{try code_sign.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("now signed by: {s}\n", .{try signer_cert.getSubjectCN(alloc)});
    std.debug.print("certificate valid until: {s}\n", .{try signer_cert.getValidToStr(alloc)});
}