Rust Requires Chilkat v10.1.2+

Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. Rust

// 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.
let mailman = chilkat::MailMan::new();

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

// Create a new email object
let email = chilkat::Email::new();

email.set_subject("This email is signed");
email.set_body("This is a digitally signed mail");
email.set_from("Chilkat Admin <admin@chilkatsoft.com>");
let _ = email.add_to("Chilkat Support", "support@chilkatsoft.com").is_ok();

// Indicate that the email should be sent signed.
email.set_send_signed(true);

// Load a PFX file into a certificate store object.
// Then locate the certificate matching the  sender's email address,
// and use it for signing.
// (a PFX file may contain more than one certificate.)
let cert_store = chilkat::CertStore::new();
// The 1st argument is the path of the PFX file, the 2nd arg is the 
// PFX file's password:
if cert_store.load_pfx_file("/pfx_files/chilkatsoft_secret.pfx", "secret").is_err() {
    println!("{}", cert_store.last_error_text());
    return;
}

// Find the certificate for the email address:
let json_e = chilkat::JsonObject::new();
let _ = json_e.update_string("email", "admin@chilkatsoft.com");

let cert = chilkat::Cert::new();
if cert_store.find_cert(&json_e, &cert).is_err() {
    println!("{}", cert_store.last_error_text());
    return;
}

// Alternatively, if a PFX file is known to contain a single certificate,
// you may load it directly into a Chilkat certificate object.
// This snippet of source code shows how:
let cert2 = chilkat::Cert::new();
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
if cert2.load_pfx_file("/pfx_files/chilkatsoft_secret.pfx", "secret").is_err() {
    println!("{}", cert2.last_error_text());
    return;
}

// This example will use the cert from the certStore...
let _ = email.set_signing_cert(&cert).is_ok();

// Signed email can be sent in two different ways.  
// In a multipart/signed email, the signature is attached as a separate MIME part.
// In an opaque email (signedData) the content of the email is encapsulated within the signature
// and the email is sent as "application/pkcs7-mime". 
// Either should be fine, but some receiving systems might require one or the other..
mailman.set_opaque_signing(false);

// Send a signed email.
if mailman.send_email(&email).is_err() {
    println!("{}", mailman.last_error_text());
} else {
    // The LastErrorText property provides information
    // even when successful.
    println!("{}", mailman.last_error_text());
    println!("Mail Sent!");
}