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/*
This file is part of GNUnet.
(C) 2014 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.secretsharing;
import org.gnunet.secretsharing.messages.ClientDecryptMessage;
import org.gnunet.secretsharing.messages.DecryptDoneMessage;
import org.gnunet.util.AbsoluteTime;
import org.gnunet.util.Client;
import org.gnunet.util.Configuration;
import org.gnunet.util.RunaboutMessageReceiver;
/**
* Cooperatively decrypt a ciphertext.
*/
public class Decryption {
private Client client;
private DecryptCallback decryptCallback;
private class DecryptionReceiver extends RunaboutMessageReceiver {
public void visit(DecryptDoneMessage m) {
if (m.success != 0) {
decryptCallback.onResult(m.plaintext);
} else {
decryptCallback.onResult(null);
}
client.disconnect();
client = null;
}
@Override
public void handleError() {
decryptCallback.onResult(null);
}
}
/**
* Cooperatively decrypt a ciphertext encrypted with a
* threshold key.
*
* @param configuration configuration to use for connecting to the
* secretsharing service
* @param share the local peer's share of the threshold key
* @param ciphertext ciphertext to decrypt
* @param start when should we start decrypting?
* @param deadline when should decryption be finished?
* @param decryptCallback called when the decryption finished, or
* an error occurred.
*/
public Decryption(Configuration configuration, Share share, Ciphertext ciphertext,
AbsoluteTime start, AbsoluteTime deadline, DecryptCallback decryptCallback) {
this.decryptCallback = decryptCallback;
client = new Client("secretsharing", configuration);
client.installReceiver(new DecryptionReceiver());
ClientDecryptMessage m = new ClientDecryptMessage();
m.ciphertext = ciphertext;
m.deadline = deadline.asMessage();
m.start = start.asMessage();
m.share = share;
client.send(m);
}
public void disconnect() {
if (null != client) {
client.disconnect();
client = null;
}
}
}
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