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Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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

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

    // Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
    // corresponding private key (as separate objects) for decrypting a received encrypted
    // email.  Set them before loading the encrypted email.

    const email = try chilkat.Email.init();
    defer email.deinit();

    // Load the certificate (public) and the matching private key from separate files.
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    cert.loadFromFile("qa_data/certs/recipient.cer") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    priv_key.loadPemFile("qa_data/certs/recipient_privkey.pem") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // Provide the certificate and private key to use for decryption.
    email.setDecryptCert2(cert, priv_key) catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // Load the encrypted email; Chilkat decrypts it using the certificate and key.
    email.loadEml("qa_data/eml/encrypted.eml") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Decrypted = {}\n", .{email.getDecrypted()});

    // Note: Paths such as "qa_data/..." are relative local filesystem paths,
    // relative to the current working directory of the running application.
}