Zig

Send Encrypted Email with a Selected Algorithm (AES, 3DES, etc.)

Sends an encrypted email using the recipient's digital certificate from a .cer file, and chooses 3DES for the encryption algorithm. (It is also possible to send AES encrypted email w/ 128-bit, 192-bit, or 256-bit encryption simply by setting the Pkcs7CryptAlg and Pkcs7KeyLength properties.) Zig

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

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

    var success: bool = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The mailman object is used for sending and receiving email.
    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    // Set the SMTP server.
    mailman.setSmtpHost("smtp.mymailserver.com");

    // Load the .cer file into a certificate object.
    // When sending S/MIME encrypted email, it is the recipient's
    // certificate that is used for encryption.  Only the public key
    // is needed to encrypt.  The recipient is the only
    // one possessing the private key, and therefore is the only
    // one able to decrypt.
    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    success = if (cert.loadFromFile("cknotes.cer")) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    }

    // Create a new email object
    const email = try chilkat.Email.init();
    defer email.deinit();

    email.setSubject("This email is encrypted");
    email.setBody("This is a digitally encrypted mail");
    email.setFrom("Chilkat Support <support@chilkatsoft.com>");
    success = if (email.addTo("Chilkat Blog", "admin@cknotes.com")) true else |_| false;

    // Indicate that the email is to be sent encrypted.
    email.setSendEncrypted(true);

    // Specify the certificate to be used for encryption.
    success = if (email.setEncryptCert(cert)) true else |_| false;

    // If desired, specify the encryption algorithm to be used.
    // The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
    email.setPkcs7CryptAlg("3des");

    // If desired, set the key length (in bits) for the encryption algorithm:
    // The possible values allowed depend on the Pkcs7CryptAlg property.
    // For "aes", the key length may be 128, 192, or 256.
    // For "3des" the key length must be 192.
    // For "des" the key length must be 40.
    // For "rc2" the key length can be 40, 56, 64, or 128.
    email.setPkcs7KeyLength(192);

    success = if (mailman.sendEmail(email)) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
    } else {
        std.debug.print("Mail Sent!\n", .{});
    }
}