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

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Demonstrates the Chilkat PrivateKey.SavePkcs8EncryptedPemFile method, which saves the key as password-protected PKCS #8 PEM (the ENCRYPTED PRIVATE KEY label). The first argument is the password and the second 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 text (PEM) form of an encrypted saved key — portable across systems and safe to store because the private material is protected by a passphrase. It is the encrypted counterpart to SavePkcs8PemFile and a good default for keys kept in configuration or version-controlled deployment repositories. Source the password securely.

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bool success = false;

//  Load a private key to export.
Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadPemFile("qa_data/private.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

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

//  Save as password-protected PKCS #8 PEM (the "ENCRYPTED PRIVATE KEY" label).  The 1st argument
//  is the password and the 2nd is the destination path.
success = privKey.SavePkcs8EncryptedPemFile(password,"qa_output/private_pkcs8_enc.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

Debug.WriteLine("Saved (encrypted).");