Rust

Find Certificate by Email Address

See more Cert Store Examples

Demonstrates how to find a certificate having the specified email address either within the cert's subject email, or the RFC822 name.

In an X.509 certificate, an email address can typically be located in two places:

1. RFC822 Name (Subject Alternative Name extension) -
   • The certificate may include an email address in the Subject Alternative Name (SAN) extension under the RFC822 Name field. This is a modern and preferred method because it allows for flexibility and alignment with security best practices.
   • To find it, Chilkat inspects the SAN extension in the certificate details.
2. Subject (Common Name or Email Address attribute) -
   • Older certificates may store the email address directly in the Subject field, typically under the Email Address attribute ("emailAddress") or, less commonly, the Common Name (CN).
   • This method is less preferred in modern standards but can still be encountered in legacy implementations. Chilkat also searches here for the email address.

Note: Requires Chilkat v10.1.2 or later.

Rust

let cert_store = chilkat::CertStore::new();

// This opens the Current User certificate store on Windows,
// On MacOS and iOS it opens the default Keychain.
let read_only = false;
if cert_store.open_current_user_store(read_only).is_err() {
    println!("{}", cert_store.last_error_text());
    return;
}

// Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
let json = chilkat::JsonObject::new();
let email_address = "joe@example.com".to_string();
let _ = json.update_string("email", &email_address);

let cert = chilkat::Cert::new();
if cert_store.find_cert(&json, &cert).is_ok() {
    // Show the full distinguished name of the certificate.
    println!("Found: {}", cert.subject_dn());
} else {
    println!("Not found.");
}