Rust

Export a Public Key as DER into a BinData

Demonstrates the Chilkat PublicKey.GetDerBd method, which writes the public key as binary DER into a BinData. The first argument selects the representation (as for GetPem) and the second is the BinData that receives the bytes (its contents are replaced).

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: The in-memory binary export: the raw DER lands in a BinData ready to hash, transmit, or hand to another API without a temporary file. It is the BinData counterpart to the text exporters, and the first argument picks the same PKCS #1 versus SubjectPublicKeyInfo structure.

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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;
}

// Write the public key as binary DER into a BinData.  The 1st argument selects the representation
// (as for GetPem) and the 2nd is the BinData that receives the bytes (its contents are replaced).
let prefer_pkcs1 = false;
let bd = chilkat::BinData::new();
if pub_key.get_der_bd(prefer_pkcs1, &bd).is_err() {
    println!("{}", pub_key.last_error_text());
    return;
}

println!("Exported {} DER bytes.", bd.num_bytes());