Rust

Use a PEM TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

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Rust

let mut success = false;

// Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
// certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
// 1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

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

// Configure the SMTP server connection.
mailman.set_smtp_host("smtp.example.com");
mailman.set_smtp_port(465);
mailman.set_smtp_ssl(true);
mailman.set_smtp_username("user@example.com");
mailman.set_smtp_password("myPassword");

// Load the client certificate from a PEM file.
if mailman.set_ssl_client_cert_pem("qa_data/certs/client.pem", "pem_password").is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

success = mailman.verify_smtp_login();
if !success {
    println!("{}", mailman.last_error_text());
    return;
}

println!("Connected using a PEM TLS client certificate.");

// Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
// relative to the current working directory of the running application.