Rust

Export a Public Key as PEM

Demonstrates the Chilkat PublicKey.GetPem method, which returns the public key in PEM format. The only argument selects the underlying DER representation: true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: PEM is the most portable way to share a public key — the Base64 text block most tooling reads. The boolean picks the encoding: false produces the modern, algorithm-independent PUBLIC KEY (SubjectPublicKeyInfo), which is the usual choice; true produces the older RSA-specific RSA PUBLIC KEY for tools that require it. A public key is not sensitive, so the PEM can be distributed openly.

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Rust


// Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
// JWK, and other supported representations.
let pub_key = chilkat::PublicKey::new();
if pub_key.load_from_file("qa_data/public.pem").is_err() {
    println!("{}", pub_key.last_error_text());
    return;
}

// Export the public key in PEM format.  The argument selects the underlying DER representation:
// true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.
let prefer_pkcs1 = false;
let Ok(pem) = pub_key.get_pem(prefer_pkcs1) else {
    println!("{}", pub_key.last_error_text());
    return;
};

println!("{}", pem);