Rust

Save a Private Key as a PKCS #8 DER File

Demonstrates the Chilkat PrivateKey.SavePkcs8File method, which saves the key as unencrypted PKCS #8 DER to a file. The only argument is the destination path.

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 file-writing counterpart to GetPkcs8ENC/GetPkcs8Pem, producing a compact binary .der in the algorithm-independent PKCS #8 container. Because it is unencrypted, the file itself is the only protection for the key — store it with restrictive permissions, or use SavePkcs8EncryptedFile to add a passphrase.

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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;
}

// Save as unencrypted PKCS #8 DER.
if priv_key.save_pkcs8_file("qa_output/private_pkcs8.der").is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

println!("Saved.");