Page History

public static void main(String[] args)
  throws IOException, GeneralSecurityException, ClassNotFoundException {
  // Build map
  SerializableMap< String, Integer> map = buildMap();

  // Generate signing public/private key pair & sign map
  KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
  KeyPair kp = kpg.generateKeyPair();
  Signature sig = Signature.getInstance("SHA1withDSA");
  SignedObject signedMap = new SignedObject( map, kp.getPrivate(), sig);

  // Generate sealing key & seal map
  KeyGenerator generator;
  generator = KeyGenerator.getInstance("DES");
  generator.init(new SecureRandom());
  Key key = generator.generateKey();
  Cipher cipher = Cipher.getInstance("DES");
  cipher.init( Cipher.ENCRYPT_MODE, key);
  SealedObject sealedMap = new SealedObject( signedMap, cipher);

  // Serialize map
  ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("data"));
  out.writeObject( sealedMap);
  out.close();

  // Deserialize map
  ObjectInputStream in = new ObjectInputStream(new FileInputStream("data"));
  sealedMap = (SealedObject) in.readObject();
  in.close();

  // Unseal map
  cipher = Cipher.getInstance("DES");
  cipher.init( Cipher.DECRYPT_MODE, key);
  signedMap = (SignedObject) sealedMap.getObject(cipher);

  // Unsign map
  if (!signedMap.verify(kp.getPublic(), sig)) {
    throw new GeneralSecurityException("Map failed verification");
  }
  map = (SerializableMap<String, Integer>) signedMap.getObject();

  // Inspect map
  InspectMap( map);
}