1package eu.siacs.conversations.crypto.axolotl;
   2
   3import android.os.Bundle;
   4import android.security.KeyChain;
   5import android.support.annotation.NonNull;
   6import android.support.annotation.Nullable;
   7import android.util.Log;
   8import android.util.Pair;
   9
  10import org.bouncycastle.jce.provider.BouncyCastleProvider;
  11import org.whispersystems.libaxolotl.AxolotlAddress;
  12import org.whispersystems.libaxolotl.IdentityKey;
  13import org.whispersystems.libaxolotl.IdentityKeyPair;
  14import org.whispersystems.libaxolotl.InvalidKeyException;
  15import org.whispersystems.libaxolotl.InvalidKeyIdException;
  16import org.whispersystems.libaxolotl.SessionBuilder;
  17import org.whispersystems.libaxolotl.UntrustedIdentityException;
  18import org.whispersystems.libaxolotl.ecc.ECPublicKey;
  19import org.whispersystems.libaxolotl.state.PreKeyBundle;
  20import org.whispersystems.libaxolotl.state.PreKeyRecord;
  21import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
  22import org.whispersystems.libaxolotl.util.KeyHelper;
  23
  24import java.security.PrivateKey;
  25import java.security.Security;
  26import java.security.Signature;
  27import java.security.cert.X509Certificate;
  28import java.util.ArrayList;
  29import java.util.Arrays;
  30import java.util.Collection;
  31import java.util.Collections;
  32import java.util.HashMap;
  33import java.util.HashSet;
  34import java.util.List;
  35import java.util.Map;
  36import java.util.Random;
  37import java.util.Set;
  38import java.util.concurrent.atomic.AtomicBoolean;
  39
  40import eu.siacs.conversations.Config;
  41import eu.siacs.conversations.entities.Account;
  42import eu.siacs.conversations.entities.Contact;
  43import eu.siacs.conversations.entities.Conversation;
  44import eu.siacs.conversations.entities.Message;
  45import eu.siacs.conversations.parser.IqParser;
  46import eu.siacs.conversations.services.XmppConnectionService;
  47import eu.siacs.conversations.utils.CryptoHelper;
  48import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
  49import eu.siacs.conversations.xml.Element;
  50import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
  51import eu.siacs.conversations.xmpp.OnIqPacketReceived;
  52import eu.siacs.conversations.xmpp.jid.InvalidJidException;
  53import eu.siacs.conversations.xmpp.jid.Jid;
  54import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  55
  56public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
  57
  58	public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
  59	public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
  60	public static final String PEP_DEVICE_LIST_NOTIFY = PEP_DEVICE_LIST + "+notify";
  61	public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
  62	public static final String PEP_VERIFICATION = PEP_PREFIX + ".verification";
  63
  64	public static final String LOGPREFIX = "AxolotlService";
  65
  66	public static final int NUM_KEYS_TO_PUBLISH = 100;
  67	public static final int publishTriesThreshold = 3;
  68
  69	private final Account account;
  70	private final XmppConnectionService mXmppConnectionService;
  71	private final SQLiteAxolotlStore axolotlStore;
  72	private final SessionMap sessions;
  73	private final Map<Jid, Set<Integer>> deviceIds;
  74	private final Map<String, XmppAxolotlMessage> messageCache;
  75	private final FetchStatusMap fetchStatusMap;
  76	private final SerialSingleThreadExecutor executor;
  77	private int numPublishTriesOnEmptyPep = 0;
  78	private boolean pepBroken = false;
  79
  80	private AtomicBoolean ownPushPending = new AtomicBoolean(false);
  81
  82	@Override
  83	public void onAdvancedStreamFeaturesAvailable(Account account) {
  84		if (Config.supportOmemo()
  85				&& account.getXmppConnection() != null
  86				&& account.getXmppConnection().getFeatures().pep()) {
  87			publishBundlesIfNeeded(true, false);
  88		} else {
  89			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": skipping OMEMO initialization");
  90		}
  91	}
  92
  93	public boolean fetchMapHasErrors(List<Jid> jids) {
  94		for(Jid jid : jids) {
  95			if (deviceIds.get(jid) != null) {
  96				for (Integer foreignId : this.deviceIds.get(jid)) {
  97					AxolotlAddress address = new AxolotlAddress(jid.toPreppedString(), foreignId);
  98					if (fetchStatusMap.getAll(address).containsValue(FetchStatus.ERROR)) {
  99						return true;
 100					}
 101				}
 102			}
 103		}
 104		return false;
 105	}
 106
 107	public void preVerifyFingerprint(Contact contact, String fingerprint) {
 108		axolotlStore.preVerifyFingerprint(contact.getAccount(), contact.getJid().toBareJid().toPreppedString(), fingerprint);
 109	}
 110
 111	public void preVerifyFingerprint(Account account, String fingerprint) {
 112		axolotlStore.preVerifyFingerprint(account, account.getJid().toBareJid().toPreppedString(), fingerprint);
 113	}
 114
 115	public boolean hasVerifiedKeys(String name) {
 116		for(XmppAxolotlSession session : this.sessions.getAll(new AxolotlAddress(name,0)).values()) {
 117			if (session.getTrust().isVerified()) {
 118				return true;
 119			}
 120		}
 121		return false;
 122	}
 123
 124	private static class AxolotlAddressMap<T> {
 125		protected Map<String, Map<Integer, T>> map;
 126		protected final Object MAP_LOCK = new Object();
 127
 128		public AxolotlAddressMap() {
 129			this.map = new HashMap<>();
 130		}
 131
 132		public void put(AxolotlAddress address, T value) {
 133			synchronized (MAP_LOCK) {
 134				Map<Integer, T> devices = map.get(address.getName());
 135				if (devices == null) {
 136					devices = new HashMap<>();
 137					map.put(address.getName(), devices);
 138				}
 139				devices.put(address.getDeviceId(), value);
 140			}
 141		}
 142
 143		public T get(AxolotlAddress address) {
 144			synchronized (MAP_LOCK) {
 145				Map<Integer, T> devices = map.get(address.getName());
 146				if (devices == null) {
 147					return null;
 148				}
 149				return devices.get(address.getDeviceId());
 150			}
 151		}
 152
 153		public Map<Integer, T> getAll(AxolotlAddress address) {
 154			synchronized (MAP_LOCK) {
 155				Map<Integer, T> devices = map.get(address.getName());
 156				if (devices == null) {
 157					return new HashMap<>();
 158				}
 159				return devices;
 160			}
 161		}
 162
 163		public boolean hasAny(AxolotlAddress address) {
 164			synchronized (MAP_LOCK) {
 165				Map<Integer, T> devices = map.get(address.getName());
 166				return devices != null && !devices.isEmpty();
 167			}
 168		}
 169
 170		public void clear() {
 171			map.clear();
 172		}
 173
 174	}
 175
 176	private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
 177		private final XmppConnectionService xmppConnectionService;
 178		private final Account account;
 179
 180		public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
 181			super();
 182			this.xmppConnectionService = service;
 183			this.account = account;
 184			this.fillMap(store);
 185		}
 186
 187		private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
 188			for (Integer deviceId : deviceIds) {
 189				AxolotlAddress axolotlAddress = new AxolotlAddress(bareJid, deviceId);
 190				IdentityKey identityKey = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey();
 191				if(Config.X509_VERIFICATION) {
 192					X509Certificate certificate = store.getFingerprintCertificate(identityKey.getFingerprint().replaceAll("\\s", ""));
 193					if (certificate != null) {
 194						Bundle information = CryptoHelper.extractCertificateInformation(certificate);
 195						try {
 196							final String cn = information.getString("subject_cn");
 197							final Jid jid = Jid.fromString(bareJid);
 198							Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
 199							account.getRoster().getContact(jid).setCommonName(cn);
 200						} catch (final InvalidJidException ignored) {
 201							//ignored
 202						}
 203					}
 204				}
 205				this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, identityKey));
 206			}
 207		}
 208
 209		private void fillMap(SQLiteAxolotlStore store) {
 210			List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toPreppedString());
 211			putDevicesForJid(account.getJid().toBareJid().toPreppedString(), deviceIds, store);
 212			for (Contact contact : account.getRoster().getContacts()) {
 213				Jid bareJid = contact.getJid().toBareJid();
 214				String address = bareJid.toString();
 215				deviceIds = store.getSubDeviceSessions(address);
 216				putDevicesForJid(address, deviceIds, store);
 217			}
 218
 219		}
 220
 221		@Override
 222		public void put(AxolotlAddress address, XmppAxolotlSession value) {
 223			super.put(address, value);
 224			value.setNotFresh();
 225			xmppConnectionService.syncRosterToDisk(account); //TODO why?
 226		}
 227
 228		public void put(XmppAxolotlSession session) {
 229			this.put(session.getRemoteAddress(), session);
 230		}
 231	}
 232
 233	public enum FetchStatus {
 234		PENDING,
 235		SUCCESS,
 236		SUCCESS_VERIFIED,
 237		TIMEOUT,
 238		SUCCESS_TRUSTED,
 239		ERROR
 240	}
 241
 242	private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
 243
 244		public void clearErrorFor(Jid jid) {
 245			synchronized (MAP_LOCK) {
 246				Map<Integer, FetchStatus> devices = this.map.get(jid.toBareJid().toPreppedString());
 247				if (devices == null) {
 248					return;
 249				}
 250				for(Map.Entry<Integer, FetchStatus> entry : devices.entrySet()) {
 251					if (entry.getValue() == FetchStatus.ERROR) {
 252						Log.d(Config.LOGTAG,"resetting error for "+jid.toBareJid()+"("+entry.getKey()+")");
 253						entry.setValue(FetchStatus.TIMEOUT);
 254					}
 255				}
 256			}
 257		}
 258	}
 259
 260	public static String getLogprefix(Account account) {
 261		return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
 262	}
 263
 264	public AxolotlService(Account account, XmppConnectionService connectionService) {
 265		if (Security.getProvider("BC") == null) {
 266			Security.addProvider(new BouncyCastleProvider());
 267		}
 268		this.mXmppConnectionService = connectionService;
 269		this.account = account;
 270		this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
 271		this.deviceIds = new HashMap<>();
 272		this.messageCache = new HashMap<>();
 273		this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
 274		this.fetchStatusMap = new FetchStatusMap();
 275		this.executor = new SerialSingleThreadExecutor();
 276	}
 277
 278	public String getOwnFingerprint() {
 279		return axolotlStore.getIdentityKeyPair().getPublicKey().getFingerprint().replaceAll("\\s", "");
 280	}
 281
 282	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status) {
 283		return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toPreppedString(), status);
 284	}
 285
 286	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, Jid jid) {
 287		return axolotlStore.getContactKeysWithTrust(jid.toBareJid().toPreppedString(), status);
 288	}
 289
 290	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, List<Jid> jids) {
 291		Set<IdentityKey> keys = new HashSet<>();
 292		for(Jid jid : jids) {
 293			keys.addAll(axolotlStore.getContactKeysWithTrust(jid.toPreppedString(), status));
 294		}
 295		return keys;
 296	}
 297
 298	public long getNumTrustedKeys(Jid jid) {
 299		return axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString());
 300	}
 301
 302	public boolean anyTargetHasNoTrustedKeys(List<Jid> jids) {
 303		for(Jid jid : jids) {
 304			if (axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString()) == 0) {
 305				return true;
 306			}
 307		}
 308		return false;
 309	}
 310
 311	private AxolotlAddress getAddressForJid(Jid jid) {
 312		return new AxolotlAddress(jid.toPreppedString(), 0);
 313	}
 314
 315	public Collection<XmppAxolotlSession> findOwnSessions() {
 316		AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
 317		ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(ownAddress).values());
 318		Collections.sort(s);
 319		return s;
 320	}
 321
 322
 323
 324	public Collection<XmppAxolotlSession> findSessionsForContact(Contact contact) {
 325		AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
 326		ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(contactAddress).values());
 327		Collections.sort(s);
 328		return s;
 329	}
 330
 331	private Set<XmppAxolotlSession> findSessionsForConversation(Conversation conversation) {
 332		HashSet<XmppAxolotlSession> sessions = new HashSet<>();
 333		for(Jid jid : conversation.getAcceptedCryptoTargets()) {
 334			sessions.addAll(this.sessions.getAll(getAddressForJid(jid)).values());
 335		}
 336		return sessions;
 337	}
 338
 339	private boolean hasAny(Jid jid) {
 340		return sessions.hasAny(getAddressForJid(jid));
 341	}
 342
 343	public boolean isPepBroken() {
 344		return this.pepBroken;
 345	}
 346
 347	public void resetBrokenness() {
 348		this.pepBroken = false;
 349		numPublishTriesOnEmptyPep = 0;
 350	}
 351
 352	public void clearErrorsInFetchStatusMap(Jid jid) {
 353		fetchStatusMap.clearErrorFor(jid);
 354	}
 355
 356	public void regenerateKeys(boolean wipeOther) {
 357		axolotlStore.regenerate();
 358		sessions.clear();
 359		fetchStatusMap.clear();
 360		publishBundlesIfNeeded(true, wipeOther);
 361	}
 362
 363	public int getOwnDeviceId() {
 364		return axolotlStore.getLocalRegistrationId();
 365	}
 366
 367	public Set<Integer> getOwnDeviceIds() {
 368		return this.deviceIds.get(account.getJid().toBareJid());
 369	}
 370
 371	public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
 372		boolean me = jid.toBareJid().equals(account.getJid().toBareJid());
 373		if (me && ownPushPending.getAndSet(false)) {
 374			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": ignoring own device update because of pending push");
 375			return;
 376		}
 377		boolean needsPublishing = me && !deviceIds.contains(getOwnDeviceId());
 378		if (me) {
 379			deviceIds.remove(getOwnDeviceId());
 380		}
 381		Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toPreppedString()));
 382		expiredDevices.removeAll(deviceIds);
 383		for (Integer deviceId : expiredDevices) {
 384			AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
 385			XmppAxolotlSession session = sessions.get(address);
 386			if (session != null && session.getFingerprint() != null) {
 387				if (session.getTrust().isActive()) {
 388					session.setTrust(session.getTrust().toInactive());
 389				}
 390			}
 391		}
 392		Set<Integer> newDevices = new HashSet<>(deviceIds);
 393		for (Integer deviceId : newDevices) {
 394			AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
 395			XmppAxolotlSession session = sessions.get(address);
 396			if (session != null && session.getFingerprint() != null) {
 397				if (!session.getTrust().isActive()) {
 398					Log.d(Config.LOGTAG,"reactivating device with fingprint "+session.getFingerprint());
 399					session.setTrust(session.getTrust().toActive());
 400				}
 401			}
 402		}
 403		if (me) {
 404			if (Config.OMEMO_AUTO_EXPIRY != 0) {
 405				needsPublishing |= deviceIds.removeAll(getExpiredDevices());
 406			}
 407			for (Integer deviceId : deviceIds) {
 408				AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
 409				if (sessions.get(ownDeviceAddress) == null) {
 410					buildSessionFromPEP(ownDeviceAddress);
 411				}
 412			}
 413			if (needsPublishing) {
 414				publishOwnDeviceId(deviceIds);
 415			}
 416		}
 417		this.deviceIds.put(jid, deviceIds);
 418		mXmppConnectionService.updateConversationUi(); //update the lock icon
 419		mXmppConnectionService.keyStatusUpdated(null);
 420	}
 421
 422	public void wipeOtherPepDevices() {
 423		if (pepBroken) {
 424			Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
 425			return;
 426		}
 427		Set<Integer> deviceIds = new HashSet<>();
 428		deviceIds.add(getOwnDeviceId());
 429		IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
 430		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
 431		mXmppConnectionService.sendIqPacket(account, publish, null);
 432	}
 433
 434	public void purgeKey(final String fingerprint) {
 435		axolotlStore.setFingerprintStatus(fingerprint.replaceAll("\\s", ""), FingerprintStatus.createCompromised());
 436	}
 437
 438	public void publishOwnDeviceIdIfNeeded() {
 439		if (pepBroken) {
 440			Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
 441			return;
 442		}
 443		IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
 444		mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 445			@Override
 446			public void onIqPacketReceived(Account account, IqPacket packet) {
 447				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 448					Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
 449				} else {
 450					Element item = mXmppConnectionService.getIqParser().getItem(packet);
 451					Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
 452					registerDevices(account.getJid().toBareJid(),deviceIds);
 453				}
 454			}
 455		});
 456	}
 457
 458	private Set<Integer> getExpiredDevices() {
 459		Set<Integer> devices = new HashSet<>();
 460		for(XmppAxolotlSession session : findOwnSessions()) {
 461			if (session.getTrust().isActive()) {
 462				long diff = System.currentTimeMillis() - session.getTrust().getLastActivation();
 463				if (diff > Config.OMEMO_AUTO_EXPIRY) {
 464					long lastMessageDiff = System.currentTimeMillis() - mXmppConnectionService.databaseBackend.getLastTimeFingerprintUsed(account,session.getFingerprint());
 465					if (lastMessageDiff > Config.OMEMO_AUTO_EXPIRY) {
 466						devices.add(session.getRemoteAddress().getDeviceId());
 467						session.setTrust(session.getTrust().toInactive());
 468						Log.d(Config.LOGTAG, "added own device " + session.getFingerprint() + " to list of expired devices. Last message received "+(lastMessageDiff/1000)+"s ago");
 469					}
 470				}
 471			}
 472		}
 473		return devices;
 474	}
 475
 476	public void publishOwnDeviceId(Set<Integer> deviceIds) {
 477		Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
 478		if (!deviceIdsCopy.contains(getOwnDeviceId())) {
 479			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist.");
 480			if (deviceIdsCopy.isEmpty()) {
 481				if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
 482					Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
 483					pepBroken = true;
 484					return;
 485				} else {
 486					numPublishTriesOnEmptyPep++;
 487					Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
 488				}
 489			} else {
 490				numPublishTriesOnEmptyPep = 0;
 491			}
 492			deviceIdsCopy.add(getOwnDeviceId());
 493			IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIdsCopy);
 494			ownPushPending.set(true);
 495			mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
 496				@Override
 497				public void onIqPacketReceived(Account account, IqPacket packet) {
 498					ownPushPending.set(false);
 499					if (packet.getType() == IqPacket.TYPE.ERROR) {
 500						pepBroken = true;
 501						Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
 502					}
 503				}
 504			});
 505		}
 506	}
 507
 508	public void publishDeviceVerificationAndBundle(final SignedPreKeyRecord signedPreKeyRecord,
 509												   final Set<PreKeyRecord> preKeyRecords,
 510												   final boolean announceAfter,
 511												   final boolean wipe) {
 512		try {
 513			IdentityKey axolotlPublicKey = axolotlStore.getIdentityKeyPair().getPublicKey();
 514			PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
 515			X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
 516			Signature verifier = Signature.getInstance("sha256WithRSA");
 517			verifier.initSign(x509PrivateKey,mXmppConnectionService.getRNG());
 518			verifier.update(axolotlPublicKey.serialize());
 519			byte[] signature = verifier.sign();
 520			IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
 521			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": publish verification for device "+getOwnDeviceId());
 522			mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 523				@Override
 524				public void onIqPacketReceived(Account account, IqPacket packet) {
 525					publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
 526				}
 527			});
 528		} catch (Exception  e) {
 529			e.printStackTrace();
 530		}
 531	}
 532
 533	public void publishBundlesIfNeeded(final boolean announce, final boolean wipe) {
 534		if (pepBroken) {
 535			Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
 536			return;
 537		}
 538		IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
 539		mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 540			@Override
 541			public void onIqPacketReceived(Account account, IqPacket packet) {
 542
 543				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 544					return; //ignore timeout. do nothing
 545				}
 546
 547				if (packet.getType() == IqPacket.TYPE.ERROR) {
 548					Element error = packet.findChild("error");
 549					if (error == null || !error.hasChild("item-not-found")) {
 550						pepBroken = true;
 551						Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "request for device bundles came back with something other than item-not-found" + packet);
 552						return;
 553					}
 554				}
 555
 556				PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
 557				Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
 558				boolean flush = false;
 559				if (bundle == null) {
 560					Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
 561					bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
 562					flush = true;
 563				}
 564				if (keys == null) {
 565					Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
 566				}
 567				try {
 568					boolean changed = false;
 569					// Validate IdentityKey
 570					IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
 571					if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
 572						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
 573						changed = true;
 574					}
 575
 576					// Validate signedPreKeyRecord + ID
 577					SignedPreKeyRecord signedPreKeyRecord;
 578					int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
 579					try {
 580						signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
 581						if (flush
 582								|| !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
 583								|| !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
 584							Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
 585							signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
 586							axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
 587							changed = true;
 588						}
 589					} catch (InvalidKeyIdException e) {
 590						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
 591						signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
 592						axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
 593						changed = true;
 594					}
 595
 596					// Validate PreKeys
 597					Set<PreKeyRecord> preKeyRecords = new HashSet<>();
 598					if (keys != null) {
 599						for (Integer id : keys.keySet()) {
 600							try {
 601								PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
 602								if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
 603									preKeyRecords.add(preKeyRecord);
 604								}
 605							} catch (InvalidKeyIdException ignored) {
 606							}
 607						}
 608					}
 609					int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
 610					if (newKeys > 0) {
 611						List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
 612								axolotlStore.getCurrentPreKeyId() + 1, newKeys);
 613						preKeyRecords.addAll(newRecords);
 614						for (PreKeyRecord record : newRecords) {
 615							axolotlStore.storePreKey(record.getId(), record);
 616						}
 617						changed = true;
 618						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
 619					}
 620
 621
 622					if (changed) {
 623						if (account.getPrivateKeyAlias() != null && Config.X509_VERIFICATION) {
 624							mXmppConnectionService.publishDisplayName(account);
 625							publishDeviceVerificationAndBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
 626						} else {
 627							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
 628						}
 629					} else {
 630						Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
 631						if (wipe) {
 632							wipeOtherPepDevices();
 633						} else if (announce) {
 634							Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
 635							publishOwnDeviceIdIfNeeded();
 636						}
 637					}
 638				} catch (InvalidKeyException e) {
 639					Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
 640				}
 641			}
 642		});
 643	}
 644
 645	private void publishDeviceBundle(SignedPreKeyRecord signedPreKeyRecord,
 646									 Set<PreKeyRecord> preKeyRecords,
 647									 final boolean announceAfter,
 648									 final boolean wipe) {
 649		IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
 650				signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
 651				preKeyRecords, getOwnDeviceId());
 652		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
 653		mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
 654			@Override
 655			public void onIqPacketReceived(Account account, IqPacket packet) {
 656				if (packet.getType() == IqPacket.TYPE.RESULT) {
 657					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
 658					if (wipe) {
 659						wipeOtherPepDevices();
 660					} else if (announceAfter) {
 661						Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
 662						publishOwnDeviceIdIfNeeded();
 663					}
 664				} else if (packet.getType() == IqPacket.TYPE.ERROR) {
 665					pepBroken = true;
 666					Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + packet.findChild("error"));
 667				}
 668			}
 669		});
 670	}
 671
 672	public enum AxolotlCapability {
 673		FULL,
 674		MISSING_PRESENCE,
 675		MISSING_KEYS,
 676		WRONG_CONFIGURATION,
 677		NO_MEMBERS
 678	}
 679
 680	public boolean isConversationAxolotlCapable(Conversation conversation) {
 681		return isConversationAxolotlCapableDetailed(conversation).first == AxolotlCapability.FULL;
 682	}
 683
 684	public Pair<AxolotlCapability,Jid> isConversationAxolotlCapableDetailed(Conversation conversation) {
 685		if (conversation.getMode() == Conversation.MODE_SINGLE
 686				|| (conversation.getMucOptions().membersOnly() && conversation.getMucOptions().nonanonymous())) {
 687			final List<Jid> jids = getCryptoTargets(conversation);
 688			for(Jid jid : jids) {
 689				if (!hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty())) {
 690					if (conversation.getAccount().getRoster().getContact(jid).mutualPresenceSubscription()) {
 691						return new Pair<>(AxolotlCapability.MISSING_KEYS,jid);
 692					} else {
 693						return new Pair<>(AxolotlCapability.MISSING_PRESENCE,jid);
 694					}
 695				}
 696			}
 697			if (jids.size() > 0) {
 698				return new Pair<>(AxolotlCapability.FULL, null);
 699			} else {
 700				return new Pair<>(AxolotlCapability.NO_MEMBERS, null);
 701			}
 702		} else {
 703			return new Pair<>(AxolotlCapability.WRONG_CONFIGURATION, null);
 704		}
 705	}
 706
 707	public List<Jid> getCryptoTargets(Conversation conversation) {
 708		final List<Jid> jids;
 709		if (conversation.getMode() == Conversation.MODE_SINGLE) {
 710			jids = Arrays.asList(conversation.getJid().toBareJid());
 711		} else {
 712			jids = conversation.getMucOptions().getMembers();
 713		}
 714		return jids;
 715	}
 716
 717	public FingerprintStatus getFingerprintTrust(String fingerprint) {
 718		return axolotlStore.getFingerprintStatus(fingerprint);
 719	}
 720
 721	public X509Certificate getFingerprintCertificate(String fingerprint) {
 722		return axolotlStore.getFingerprintCertificate(fingerprint);
 723	}
 724
 725	public void setFingerprintTrust(String fingerprint, FingerprintStatus status) {
 726		axolotlStore.setFingerprintStatus(fingerprint, status);
 727	}
 728
 729	private void verifySessionWithPEP(final XmppAxolotlSession session) {
 730		Log.d(Config.LOGTAG, "trying to verify fresh session (" + session.getRemoteAddress().getName() + ") with pep");
 731		final AxolotlAddress address = session.getRemoteAddress();
 732		final IdentityKey identityKey = session.getIdentityKey();
 733		try {
 734			IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveVerificationForDevice(Jid.fromString(address.getName()), address.getDeviceId());
 735			mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 736				@Override
 737				public void onIqPacketReceived(Account account, IqPacket packet) {
 738					Pair<X509Certificate[],byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
 739					if (verification != null) {
 740						try {
 741							Signature verifier = Signature.getInstance("sha256WithRSA");
 742							verifier.initVerify(verification.first[0]);
 743							verifier.update(identityKey.serialize());
 744							if (verifier.verify(verification.second)) {
 745								try {
 746									mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
 747									String fingerprint = session.getFingerprint();
 748									Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: "+fingerprint);
 749									setFingerprintTrust(fingerprint, FingerprintStatus.createActiveVerified(true));
 750									axolotlStore.setFingerprintCertificate(fingerprint, verification.first[0]);
 751									fetchStatusMap.put(address, FetchStatus.SUCCESS_VERIFIED);
 752									Bundle information = CryptoHelper.extractCertificateInformation(verification.first[0]);
 753									try {
 754										final String cn = information.getString("subject_cn");
 755										final Jid jid = Jid.fromString(address.getName());
 756										Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
 757										account.getRoster().getContact(jid).setCommonName(cn);
 758									} catch (final InvalidJidException ignored) {
 759										//ignored
 760									}
 761									finishBuildingSessionsFromPEP(address);
 762									return;
 763								} catch (Exception e) {
 764									Log.d(Config.LOGTAG,"could not verify certificate");
 765								}
 766							}
 767						} catch (Exception e) {
 768							Log.d(Config.LOGTAG, "error during verification " + e.getMessage());
 769						}
 770					} else {
 771						Log.d(Config.LOGTAG,"no verification found");
 772					}
 773					fetchStatusMap.put(address, FetchStatus.SUCCESS);
 774					finishBuildingSessionsFromPEP(address);
 775				}
 776			});
 777		} catch (InvalidJidException e) {
 778			fetchStatusMap.put(address, FetchStatus.SUCCESS);
 779			finishBuildingSessionsFromPEP(address);
 780		}
 781	}
 782
 783	private void finishBuildingSessionsFromPEP(final AxolotlAddress address) {
 784		AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), 0);
 785		Map<Integer, FetchStatus> own = fetchStatusMap.getAll(ownAddress);
 786		Map<Integer, FetchStatus> remote = fetchStatusMap.getAll(address);
 787		if (!own.containsValue(FetchStatus.PENDING) && !remote.containsValue(FetchStatus.PENDING)) {
 788			FetchStatus report = null;
 789			if (own.containsValue(FetchStatus.SUCCESS) || remote.containsValue(FetchStatus.SUCCESS)) {
 790				report = FetchStatus.SUCCESS;
 791			} else if (own.containsValue(FetchStatus.SUCCESS_VERIFIED) || remote.containsValue(FetchStatus.SUCCESS_VERIFIED)) {
 792				report = FetchStatus.SUCCESS_VERIFIED;
 793			} else if (own.containsValue(FetchStatus.SUCCESS_TRUSTED) || remote.containsValue(FetchStatus.SUCCESS_TRUSTED)) {
 794				report = FetchStatus.SUCCESS_TRUSTED;
 795			} else if (own.containsValue(FetchStatus.ERROR) || remote.containsValue(FetchStatus.ERROR)) {
 796				report = FetchStatus.ERROR;
 797			}
 798			mXmppConnectionService.keyStatusUpdated(report);
 799		}
 800	}
 801
 802	private void buildSessionFromPEP(final AxolotlAddress address) {
 803		Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.toString());
 804		if (address.getDeviceId() == getOwnDeviceId()) {
 805			throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
 806		}
 807
 808		try {
 809			IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
 810					Jid.fromString(address.getName()), address.getDeviceId());
 811			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
 812			mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
 813
 814				@Override
 815				public void onIqPacketReceived(Account account, IqPacket packet) {
 816					if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 817						fetchStatusMap.put(address, FetchStatus.TIMEOUT);
 818					} else if (packet.getType() == IqPacket.TYPE.RESULT) {
 819						Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
 820						final IqParser parser = mXmppConnectionService.getIqParser();
 821						final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
 822						final PreKeyBundle bundle = parser.bundle(packet);
 823						if (preKeyBundleList.isEmpty() || bundle == null) {
 824							Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
 825							fetchStatusMap.put(address, FetchStatus.ERROR);
 826							finishBuildingSessionsFromPEP(address);
 827							return;
 828						}
 829						Random random = new Random();
 830						final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
 831						if (preKey == null) {
 832							//should never happen
 833							fetchStatusMap.put(address, FetchStatus.ERROR);
 834							finishBuildingSessionsFromPEP(address);
 835							return;
 836						}
 837
 838						final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
 839								preKey.getPreKeyId(), preKey.getPreKey(),
 840								bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
 841								bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
 842
 843						try {
 844							SessionBuilder builder = new SessionBuilder(axolotlStore, address);
 845							builder.process(preKeyBundle);
 846							XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey());
 847							sessions.put(address, session);
 848							if (Config.X509_VERIFICATION) {
 849								verifySessionWithPEP(session);
 850							} else {
 851								FingerprintStatus status = getFingerprintTrust(bundle.getIdentityKey().getFingerprint().replaceAll("\\s",""));
 852								FetchStatus fetchStatus;
 853								if (status != null && status.isVerified()) {
 854									fetchStatus = FetchStatus.SUCCESS_VERIFIED;
 855								} else if (status != null && status.isTrusted()) {
 856									fetchStatus = FetchStatus.SUCCESS_TRUSTED;
 857								} else {
 858									fetchStatus = FetchStatus.SUCCESS;
 859								}
 860								fetchStatusMap.put(address, fetchStatus);
 861								finishBuildingSessionsFromPEP(address);
 862							}
 863						} catch (UntrustedIdentityException | InvalidKeyException e) {
 864							Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
 865									+ e.getClass().getName() + ", " + e.getMessage());
 866							fetchStatusMap.put(address, FetchStatus.ERROR);
 867							finishBuildingSessionsFromPEP(address);
 868						}
 869					} else {
 870						fetchStatusMap.put(address, FetchStatus.ERROR);
 871						Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
 872						finishBuildingSessionsFromPEP(address);
 873					}
 874				}
 875			});
 876		} catch (InvalidJidException e) {
 877			Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
 878		}
 879	}
 880
 881	public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
 882		Set<AxolotlAddress> addresses = new HashSet<>();
 883		for(Jid jid : getCryptoTargets(conversation)) {
 884			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + jid);
 885			if (deviceIds.get(jid) != null) {
 886				for (Integer foreignId : this.deviceIds.get(jid)) {
 887					AxolotlAddress address = new AxolotlAddress(jid.toPreppedString(), foreignId);
 888					if (sessions.get(address) == null) {
 889						IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
 890						if (identityKey != null) {
 891							Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
 892							XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
 893							sessions.put(address, session);
 894						} else {
 895							Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + jid + ":" + foreignId);
 896							if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
 897								addresses.add(address);
 898							} else {
 899								Log.d(Config.LOGTAG, getLogprefix(account) + "skipping over " + address + " because it's broken");
 900							}
 901						}
 902					}
 903				}
 904			} else {
 905				Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
 906			}
 907		}
 908		if (deviceIds.get(account.getJid().toBareJid()) != null) {
 909			for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
 910				AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), ownId);
 911				if (sessions.get(address) == null) {
 912					IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
 913					if (identityKey != null) {
 914						Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
 915						XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
 916						sessions.put(address, session);
 917					} else {
 918						Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
 919						if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
 920							addresses.add(address);
 921						} else {
 922							Log.d(Config.LOGTAG,getLogprefix(account)+"skipping over "+address+" because it's broken");
 923						}
 924					}
 925				}
 926			}
 927		}
 928
 929		return addresses;
 930	}
 931
 932	public boolean createSessionsIfNeeded(final Conversation conversation) {
 933		Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
 934		boolean newSessions = false;
 935		Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
 936		for (AxolotlAddress address : addresses) {
 937			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
 938			FetchStatus status = fetchStatusMap.get(address);
 939			if (status == null || status == FetchStatus.TIMEOUT) {
 940				fetchStatusMap.put(address, FetchStatus.PENDING);
 941				this.buildSessionFromPEP(address);
 942				newSessions = true;
 943			} else if (status == FetchStatus.PENDING) {
 944				newSessions = true;
 945			} else {
 946				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
 947			}
 948		}
 949
 950		return newSessions;
 951	}
 952
 953	public boolean trustedSessionVerified(final Conversation conversation) {
 954		Set<XmppAxolotlSession> sessions = findSessionsForConversation(conversation);
 955		sessions.addAll(findOwnSessions());
 956		boolean verified = false;
 957		for(XmppAxolotlSession session : sessions) {
 958			if (session.getTrust().isTrustedAndActive()) {
 959				if (session.getTrust().getTrust() == FingerprintStatus.Trust.VERIFIED_X509) {
 960					verified = true;
 961				} else {
 962					return false;
 963				}
 964			}
 965		}
 966		return verified;
 967	}
 968
 969	public boolean hasPendingKeyFetches(Account account, List<Jid> jids) {
 970		AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), 0);
 971		if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)) {
 972			return true;
 973		}
 974		for(Jid jid : jids) {
 975			AxolotlAddress foreignAddress = new AxolotlAddress(jid.toBareJid().toPreppedString(), 0);
 976			if (fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
 977				return true;
 978			}
 979		}
 980		return false;
 981	}
 982
 983	@Nullable
 984	private XmppAxolotlMessage buildHeader(Conversation conversation) {
 985		final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
 986				account.getJid().toBareJid(), getOwnDeviceId());
 987
 988		Set<XmppAxolotlSession> remoteSessions = findSessionsForConversation(conversation);
 989		Collection<XmppAxolotlSession> ownSessions = findOwnSessions();
 990		if (remoteSessions.isEmpty()) {
 991			return null;
 992		}
 993		for (XmppAxolotlSession session : remoteSessions) {
 994			axolotlMessage.addDevice(session);
 995		}
 996		for (XmppAxolotlSession session : ownSessions) {
 997			axolotlMessage.addDevice(session);
 998		}
 999
1000		return axolotlMessage;
1001	}
1002
1003	@Nullable
1004	public XmppAxolotlMessage encrypt(Message message) {
1005		XmppAxolotlMessage axolotlMessage = buildHeader(message.getConversation());
1006
1007		if (axolotlMessage != null) {
1008			final String content;
1009			if (message.hasFileOnRemoteHost()) {
1010				content = message.getFileParams().url.toString();
1011			} else {
1012				content = message.getBody();
1013			}
1014			try {
1015				axolotlMessage.encrypt(content);
1016			} catch (CryptoFailedException e) {
1017				Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
1018				return null;
1019			}
1020		}
1021
1022		return axolotlMessage;
1023	}
1024
1025	public void preparePayloadMessage(final Message message, final boolean delay) {
1026		executor.execute(new Runnable() {
1027			@Override
1028			public void run() {
1029				XmppAxolotlMessage axolotlMessage = encrypt(message);
1030				if (axolotlMessage == null) {
1031					mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
1032					//mXmppConnectionService.updateConversationUi();
1033				} else {
1034					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
1035					messageCache.put(message.getUuid(), axolotlMessage);
1036					mXmppConnectionService.resendMessage(message, delay);
1037				}
1038			}
1039		});
1040	}
1041
1042	public void prepareKeyTransportMessage(final Conversation conversation, final OnMessageCreatedCallback onMessageCreatedCallback) {
1043		executor.execute(new Runnable() {
1044			@Override
1045			public void run() {
1046				XmppAxolotlMessage axolotlMessage = buildHeader(conversation);
1047				onMessageCreatedCallback.run(axolotlMessage);
1048			}
1049		});
1050	}
1051
1052	public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
1053		XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
1054		if (axolotlMessage != null) {
1055			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
1056			messageCache.remove(message.getUuid());
1057		} else {
1058			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
1059		}
1060		return axolotlMessage;
1061	}
1062
1063	private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
1064		IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
1065		return (identityKey != null)
1066				? new XmppAxolotlSession(account, axolotlStore, address, identityKey)
1067				: null;
1068	}
1069
1070	private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
1071		AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toPreppedString(),
1072				message.getSenderDeviceId());
1073		XmppAxolotlSession session = sessions.get(senderAddress);
1074		if (session == null) {
1075			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
1076			session = recreateUncachedSession(senderAddress);
1077			if (session == null) {
1078				session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
1079			}
1080		}
1081		return session;
1082	}
1083
1084	public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
1085		XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
1086
1087		XmppAxolotlSession session = getReceivingSession(message);
1088		try {
1089			plaintextMessage = message.decrypt(session, getOwnDeviceId());
1090			Integer preKeyId = session.getPreKeyId();
1091			if (preKeyId != null) {
1092				publishBundlesIfNeeded(false, false);
1093				session.resetPreKeyId();
1094			}
1095		} catch (CryptoFailedException e) {
1096			Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
1097		}
1098
1099		if (session.isFresh() && plaintextMessage != null) {
1100			putFreshSession(session);
1101		}
1102
1103		return plaintextMessage;
1104	}
1105
1106	public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
1107		XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage;
1108
1109		XmppAxolotlSession session = getReceivingSession(message);
1110		keyTransportMessage = message.getParameters(session, getOwnDeviceId());
1111
1112		if (session.isFresh() && keyTransportMessage != null) {
1113			putFreshSession(session);
1114		}
1115
1116		return keyTransportMessage;
1117	}
1118
1119	private void putFreshSession(XmppAxolotlSession session) {
1120		Log.d(Config.LOGTAG,"put fresh session");
1121		sessions.put(session);
1122		if (Config.X509_VERIFICATION) {
1123			if (session.getIdentityKey() != null) {
1124				verifySessionWithPEP(session);
1125			} else {
1126				Log.e(Config.LOGTAG,account.getJid().toBareJid()+": identity key was empty after reloading for x509 verification");
1127			}
1128		}
1129	}
1130}