89 lines
4.5 KiB
Java
89 lines
4.5 KiB
Java
/**
|
|
* Copyright (C) 2011 Whisper Systems
|
|
* Copyright (C) 2013 Open Whisper Systems
|
|
*
|
|
* This program 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 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
package org.thoughtcrime.securesms.crypto;
|
|
|
|
import android.app.AlertDialog;
|
|
import android.content.Context;
|
|
import android.content.DialogInterface;
|
|
|
|
import org.thoughtcrime.securesms.R;
|
|
import org.thoughtcrime.securesms.crypto.storage.TextSecureIdentityKeyStore;
|
|
import org.thoughtcrime.securesms.crypto.storage.TextSecurePreKeyStore;
|
|
import org.thoughtcrime.securesms.crypto.storage.TextSecureSessionStore;
|
|
import org.thoughtcrime.securesms.recipients.Recipient;
|
|
import org.thoughtcrime.securesms.sms.MessageSender;
|
|
import org.thoughtcrime.securesms.sms.OutgoingKeyExchangeMessage;
|
|
import org.thoughtcrime.securesms.util.Base64;
|
|
import org.thoughtcrime.securesms.util.Dialogs;
|
|
import org.whispersystems.libaxolotl.SessionBuilder;
|
|
import org.whispersystems.libaxolotl.protocol.KeyExchangeMessage;
|
|
import org.whispersystems.libaxolotl.state.IdentityKeyStore;
|
|
import org.whispersystems.libaxolotl.state.PreKeyStore;
|
|
import org.whispersystems.libaxolotl.state.SessionRecord;
|
|
import org.whispersystems.libaxolotl.state.SessionStore;
|
|
import org.whispersystems.libaxolotl.state.SignedPreKeyStore;
|
|
import org.whispersystems.textsecure.api.push.PushAddress;
|
|
|
|
public class KeyExchangeInitiator {
|
|
|
|
public static void initiate(final Context context, final MasterSecret masterSecret, final Recipient recipient, boolean promptOnExisting) {
|
|
if (promptOnExisting && hasInitiatedSession(context, masterSecret, recipient)) {
|
|
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
|
|
dialog.setTitle(R.string.KeyExchangeInitiator_initiate_despite_existing_request_question);
|
|
dialog.setMessage(R.string.KeyExchangeInitiator_youve_already_sent_a_session_initiation_request_to_this_recipient_are_you_sure);
|
|
dialog.setIcon(Dialogs.resolveIcon(context, R.attr.dialog_alert_icon));
|
|
dialog.setCancelable(true);
|
|
dialog.setPositiveButton(R.string.KeyExchangeInitiator_send, new DialogInterface.OnClickListener() {
|
|
public void onClick(DialogInterface dialog, int which) {
|
|
initiateKeyExchange(context, masterSecret, recipient);
|
|
}
|
|
});
|
|
dialog.setNegativeButton(android.R.string.cancel, null);
|
|
dialog.show();
|
|
} else {
|
|
initiateKeyExchange(context, masterSecret, recipient);
|
|
}
|
|
}
|
|
|
|
private static void initiateKeyExchange(Context context, MasterSecret masterSecret, Recipient recipient) {
|
|
SessionStore sessionStore = new TextSecureSessionStore(context, masterSecret);
|
|
PreKeyStore preKeyStore = new TextSecurePreKeyStore(context, masterSecret);
|
|
SignedPreKeyStore signedPreKeyStore = new TextSecurePreKeyStore(context, masterSecret);
|
|
IdentityKeyStore identityKeyStore = new TextSecureIdentityKeyStore(context, masterSecret);
|
|
|
|
SessionBuilder sessionBuilder = new SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore,
|
|
identityKeyStore, recipient.getRecipientId(),
|
|
PushAddress.DEFAULT_DEVICE_ID);
|
|
|
|
KeyExchangeMessage keyExchangeMessage = sessionBuilder.process();
|
|
String serializedMessage = Base64.encodeBytesWithoutPadding(keyExchangeMessage.serialize());
|
|
OutgoingKeyExchangeMessage textMessage = new OutgoingKeyExchangeMessage(recipient, serializedMessage);
|
|
|
|
MessageSender.send(context, masterSecret, textMessage, -1, false);
|
|
}
|
|
|
|
private static boolean hasInitiatedSession(Context context, MasterSecret masterSecret,
|
|
Recipient recipient)
|
|
{
|
|
SessionStore sessionStore = new TextSecureSessionStore(context, masterSecret);
|
|
SessionRecord sessionRecord = sessionStore.loadSession(recipient.getRecipientId(), PushAddress.DEFAULT_DEVICE_ID);
|
|
|
|
return sessionRecord.getSessionState().hasPendingKeyExchange();
|
|
}
|
|
}
|