Rust

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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Rust


// Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
// access to its private key) for decrypting a received encrypted email.  Set the cert
// before loading the encrypted email so it can be decrypted automatically.

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

// Load a certificate together with its private key from a PFX file.
let cert = chilkat::Cert::new();
if cert.load_pfx_file("qa_data/certs/decryption.pfx", "pfx_password").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

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

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

println!("ReceivedEncrypted = {}", email.received_encrypted());
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.