Dart

Export an Encrypted PKCS #8 Private Key as Encoded Text

Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. 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 combines encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Load a private key to export.
  final privKey = CkPrivateKey();
  try {
    privKey.loadPemFile('qa_data/private.pem');
  } on ChilkatException catch (e) {
    print(e.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.
  final password = 'myKeyPassword';

  // Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
  // argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
  // Pkcs8EncryptAlg property.
  final String encoded;
  try {
    encoded = privKey.getPkcs8EncryptedENC('base64', password);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(encoded);
}