Zig

S/MIME Encrypt using Certificate in Apple Keychain

See more Apple Keychain Examples

Encrypts MIME to creates S/MIME using a certificate found in the Apple Keychain. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const cert = try chilkat.Cert.init();
    defer cert.deinit();

    // Load the certificate by the Subject Common Name
    // On MacOS and iOS, Chilkat will search the Keychain(s) for the matching certificate.
    cert.loadByCommonName("My Cert") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Note: The private key is not needed for encryption.
    // Only the certificate is needed.

    // Create a simple MIME message to encrypt.
    const mime = try chilkat.Mime.init();
    defer mime.deinit();
    mime.addHeaderField("Subject", "test") catch {};
    mime.addHeaderField("SomeHeader", "123") catch {};
    mime.addHeaderField("Content-Type", "text/plain") catch {};
    mime.setBody("This is the body.");

    std.debug.print("{s}\n", .{try mime.getMime(alloc)});
    std.debug.print("----\n", .{});

    // Here's the MIME to be encrypted:

    // Subject: test
    // SomeHeader: 123
    // Content-Type: text/plain
    //
    // This is the body.

    // -------------------------------------
    // Encrypt the MIME.
    mime.encrypt(cert) catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    // Show the encrypted MIME (S/MIME)
    std.debug.print("{s}\n", .{try mime.getMime(alloc)});

    // Save the encrypted MIME to a file.
    mime.saveMime("./encrypted.mime") catch {};

    // Here's the S/MIME

    // Subject: test
    // SomeHeader: 123
    // Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // 
    // MIICSwYJKoZIhvcNAQcDoIICPDCCAjgCAQAxggGzMIIBrwIBADCBljCBgTELMAkGA1UEBhMCSVQx
    // EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
    // dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
    // MwIQPCWvkSv8oQ7xRmEHJ6TzEDANBgkqhkiG9w0BAQEFAASCAQB3VZvHRE5EWxug7Sckpcz1ucDZ
    // YiTKiqmyPt75MhzNRQLtKFx/jWwlemUwnPMzeu6yutCkZ74Bdn7MBsfDqV3bUz43wAu+fRBteGvF
    // mTc00MfY8L7o8dkpj4AqAOCj4hKQzbSE99GvSzyXcPE2Gm5NrOPtKxqfFqbBRTCb4fBZP84LaL+x
    // rnYfrM4qXTppixyN8iFYCd4maEbMu/GA5o+j0BkDDnx42pILDoAGV/ERyx55Y3Nc2Mhm/cITBMNn
    // g7uS9KPrlYizNaqVu09Hi9jg4gdZaRiTjUqg05tSOk/YqIQxTgfscwSPY92/ewpI6e1EHtLt8Q33
    // gWCbERptSntUMHwGCSqGSIb3DQEHATAdBglghkgBZQMEAQIEENm1AxeXlEMx7p6McjHIj5CAUEQj
    // 0GuJ5LnTqiqIjOiwmwNidl1N1TRluxX5vAQvwBuYE6bQK4+i04yn2Av3cucW4kvxgP2Nmni+XgQt
    // aPPKlasaVceEeZ15IYjw77/m3YYn
}