Rust

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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Rust


// 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.

let email = chilkat::Email::new();

// Load the certificate (public) and the matching private key from separate files.
let cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/certs/recipient.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

let priv_key = chilkat::PrivateKey::new();
if priv_key.load_pem_file("qa_data/certs/recipient_privkey.pem").is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

// Provide the certificate and private key to use for decryption.
if email.set_decrypt_cert2(&cert, &priv_key).is_err() {
    println!("{}", email.last_error_text());
    return;
}

// Load the encrypted email; Chilkat decrypts it using the certificate and key.
if email.load_eml("qa_data/eml/encrypted.eml").is_err() {
    println!("{}", email.last_error_text());
    return;
}

println!("Decrypted = {}", email.decrypted());

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