Zig Requires Chilkat v11.7.0+

Authenticode Sign a Windows Installer Package (MSI)

See more Code Signing Examples

Demonstrates how to Authenticode sign a Windows Installer package (.msi). Signing MSI packages requires Chilkat v11.7.0 or later. The package is signed in place, and the certificate must have an RSA key: Windows does not accept the signature of an MSI that was signed with an ECDSA certificate. 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.

    // Signing a Windows Installer package (.msi) requires Chilkat v11.7.0 or later.

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

    // Use a certificate with an RSA key to sign an MSI.
    // Windows does not accept the signature of an MSI that was signed with an ECDSA certificate
    // (signtool verify and the Digital Signatures tab of the file's properties report it as invalid).
    // This is a limitation of signed MSI files on Windows.  It does not apply to EXE, DLL, PowerShell,
    // or VBScript files, which can be signed with either kind of certificate.
    if (!cert.isRsa()) {
        std.debug.print("Use an RSA code signing certificate to sign an MSI.\n", .{});
        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 {};

    const msi_path = "C:/someDir/MyAppSetup.msi";

    const signer = try chilkat.CodeSign.init();
    defer signer.deinit();

    // The .msi is modified in place.  The signature is stored in the package's digital signature stream.
    // If the package is already signed, the new signature replaces the existing one.
    signer.addSignature(msi_path, cert, json) catch {
        std.debug.print("{s}\n", .{try signer.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Signed the MSI.\n", .{});

    // Verify the signature that was just added.
    const sig_info = try chilkat.JsonObject.init();
    defer sig_info.deinit();
    signer.verifySignature(msi_path, sig_info) catch {
        std.debug.print("{s}\n", .{try signer.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("The signature is valid.\n", .{});
}