Rust

Export a Private Key as DER into a BinData

Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

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: This is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

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Rust


// Load a private key to export.
let priv_key = chilkat::PrivateKey::new();
if priv_key.load_pem_file("qa_data/private.pem").is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

// The key password is not hard-coded in a real application; obtain it from an interactive
// prompt, environment variable, or a secrets vault.
let password = "myKeyPassword".to_string();

// Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (true) versus PKCS #8
// (false); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
// BinData that receives the DER bytes.
let use_pkcs1 = false;
let bd = chilkat::BinData::new();
if priv_key.get_pkcs_bd(use_pkcs1, &password, &bd).is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

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