Rust Requires Chilkat v11.0.0+

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. Rust

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

// The mailman object is used for receiving (POP3) 
// and sending (SMTP) email.
let mailman = chilkat::MailMan::new();

// Set the POP3 server's hostname
mailman.set_mail_host("pop.example.com");

// Set the POP3 login/password.
mailman.set_pop_username("myLogin");
mailman.set_pop_password("myPassword");

// If running on Microsoft Windows, the Chilkat mailman
// will automatically search the registry-based certificate stores
// for matching certificates and private keys required for
// decryption.  However, on Linux, MAX OS X, and other
// operating systems, no such thing exists.  Therefore, you'll 
// need to specify one or more PFX (.p12 / .pfx) files as
// sources for locating the certs required for decyrption.
if mailman.add_pfx_source_file("/pfxFiles/certs_and_keys_1.pfx", "pfxPassword1").is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

if mailman.add_pfx_source_file("/pfxFiles/certs_and_keys_2.pfx", "pfxPassword2").is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

// ...
// Note: On MS Windows, it is not required to provide PFX sources
// if the needed certs and private keys are already installed
// on the system (in the registry-based certificate stores).

// Copy the all email from the user's POP3 mailbox 
// into a bundle object.  The email remains on the server.
let bundle = chilkat::EmailBundle::new();
let keep_on_server = true;
let headers_only = false;
// Irrelevent because we are NOT downloading headers-only
let num_body_lines = 0;
if mailman.fetch_all(keep_on_server, headers_only, num_body_lines, &bundle).is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

// S/MIME security envelopes are automatically "unwrapped" 
// when a message is retrieved from the server. Signed emails are automatically verified, and 
// encrypted emails are automatically decrypted, restoring the email to the original state before 
// signing and/or encrypting. Information about the signing and encrypting certificates can be 
// retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert; 
// properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned, 
// ReceivedEncrypted).

// Loop over the bundle
let email = chilkat::Email::new();
let mut i = 0;
while i < bundle.message_count() {

    let _ = bundle.email_at(i, &email);

    println!("{}", email.from());
    println!("{}", email.subject());

    // At this point, if the email was signed and/or encrypted, it is already "unwrapped", i.e.
    // the email is already decrypted and in a state as if it were never signed or encrypted.
    // You may check to see if the email was received encrypted or signed, and if so,
    // whether it was successfully unwrapped and who signed or encrypted it:
    if email.received_encrypted() {

        println!("This email was encrypted when received.");
        if email.decrypted() {
            println!("This email was successfully decrypted.  It was encrypted by:");
            println!("{}", email.encrypted_by());
        } else {
            println!("This email was not decrypted.");
        }

    }

    if email.received_signed() {

        println!("This email was signed when received.");
        if email.signatures_valid() {
            println!("The signature was verified.  It was signed by:");
            println!("{}", email.signed_by());
        } else {
            println!("The signature verification failed.");
        }

    }

    // The email's body, HTML body, attachments, etc.
    // are decrypted and available just like any non-encrypted email.

    println!("--");

    i = i + 1;
}