Rust

Save a Private Key as an Encrypted PKCS #8 DER File

Demonstrates the Chilkat PrivateKey.SavePkcs8EncryptedFile method, which saves the key as password-protected PKCS #8 DER. The first argument is the password and the second is the destination path. The cipher is selected by Pkcs8EncryptAlg.

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 recommended way to persist a key to disk: the binary .der is encrypted under a passphrase, so a stolen file is useless without it. Reach for it whenever a key is stored or shipped. Choose the encryption cipher with Pkcs8EncryptAlg and source the 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();

// Save as password-protected PKCS #8 DER.  The 1st argument is the password and the 2nd is the
// destination path.  The cipher is selected by the Pkcs8EncryptAlg property.
if priv_key.save_pkcs8_encrypted_file(&password, "qa_output/private_pkcs8_enc.der").is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

println!("Saved (encrypted).");