sealedbox.dart

import 'package:pinenacl/x25519.dart' show SealedBox, PrivateKey;
import 'package:pinenacl/api.dart';

void main() {
  print('\n### Public Key Encryption - SealedBox Example ###\n');

  // Generate Bob's private key, which must be kept secret
  final skbob = PrivateKey.generate();
  final pkbob = skbob.publicKey;

  // Alice wishes to send a encrypted message to Bob,
  // but prefers the message to be untraceable
  // she puts it into a secretbox and seals it.
  final sealedBox = SealedBox(pkbob);

  final message = 'The world is changing around us and we can either get '
      'with the change or we can try to resist it';

  final encrypted = sealedBox.encrypt(message.codeUnits.toUint8List());
  try {
    sealedBox.decrypt(encrypted);
  } on Exception catch (e) {
    print('Exception\'s successfully cought:\n$e');
  }

  // Bob unseals the box with his privatekey, and decrypts it.
  final unsealedBox = SealedBox(skbob);

  final plainText = unsealedBox.decrypt(encrypted);
  print(String.fromCharCodes(plainText));
  assert(message == String.fromCharCodes(plainText));
}