Zig Requires Chilkat v10.1.2+

Create PKCS7 Signed File (.p7m)

See more Encryption Examples

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature. 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();

    const cert_store = try chilkat.CertStore.init();
    defer cert_store.deinit();

    // Load a PFX file into a certificate store object.
    cert_store.loadPfxFile("myPfx.pfx", "pfxPassword") catch {
        std.debug.print("{s}\n", .{try cert_store.getLastErrorText(alloc)});
        return;
    };

    // Get the certificate by subject common name.
    // This should be the cert within the PFX that also
    // has a private key (also stored within the PFX).
    const json_cn = try chilkat.JsonObject.init();
    defer json_cn.deinit();
    json_cn.updateString("CN", "myCert") catch {};
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    cert_store.findCert(json_cn, cert) catch {
        std.debug.print("{s}\n", .{try cert_store.getLastErrorText(alloc)});
        return;
    };

    // Tell the crypt object to use the certificate for signing:
    try crypt.setSigningCert(cert);

    // Sign a file, producing a .p7m as output.
    // The input file is unchanged, the test.p7m contains the
    // contents of the input file and the signature.
    const in_file = "test.txt";
    const out_file = "testp7m";
    crypt.createP7M(in_file, out_file) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

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