Zig Requires Chilkat v10.1.2+

Sign a File to Create a .p7m File (using a PFX)

See more Encryption Examples

_LANGUAGE_ example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M. 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 crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const signing_cert_subject = "Acme Inc";
    const pfx_filename = "/Users/chilkat/testData/pfx/acme.pfx";
    const pfx_password = "test123";

    const cert_store = try chilkat.CertStore.init();
    defer cert_store.deinit();
    cert_store.loadPfxFile(pfx_filename, pfx_password) catch {
        std.debug.print("{s}\n", .{try cert_store.getLastErrorText(alloc)});
        return;
    };

    const json_cn = try chilkat.JsonObject.init();
    defer json_cn.deinit();
    json_cn.updateString("CN", signing_cert_subject) catch {};

    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    cert_store.findCert(json_cn, cert) catch {
        std.debug.print("Failed to find certificate by subject common name.\n", .{});
        return;
    };

    // Tell the crypt component to use this cert.
    try crypt.setSigningCert(cert);

    // We can sign any type of file, creating a .p7m as output:
    var in_file: [:0]const u8 = "/Users/chilkat/testData/pdf/sample.pdf";
    var output_file: [:0]const u8 = "/Users/chilkat/testData/p7m/sample.pdf.p7m";
    crypt.createP7M(in_file, output_file) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    // Verify and restore the original file:
    try crypt.setVerifyCert(cert);

    in_file = output_file;
    output_file = "/Users/chilkat/testData/pdf/restored.pdf";

    crypt.verifyP7M(in_file, output_file) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

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