Refactor axolotl message processing workflow
XmppAxolotlMessage is now entirely responsible for handling encryption and decryption of messages, only leveraging XmppAxolotlSession as a packing/unpacking primitive for payload keys. Removed pseudo-dead session generation code step from prepareMessage function, as sessions have been created by invoking the TrustKeysActivity for a while now. Added prepareKeyTransportMessage function, which creates a message with no payload. The key that is packed into the header keyElements can then be used for other purposes (e.g. encrypted file transfer).
This commit is contained in:
Andreas Straub
parent
50b14434ee
commit
909f761ca1
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@ -256,7 +256,7 @@ public class AxolotlService {
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for (Integer deviceId : deviceIds) {
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AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
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if (sessions.get(ownDeviceAddress) == null) {
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buildSessionFromPEP(null, ownDeviceAddress, false);
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buildSessionFromPEP(ownDeviceAddress);
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}
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}
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}
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@ -422,7 +422,7 @@ public class AxolotlService {
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axolotlStore.setFingerprintTrust(fingerprint, trust);
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}
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private void buildSessionFromPEP(final Conversation conversation, final AxolotlAddress address, final boolean flushWaitingQueueAfterFetch) {
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private void buildSessionFromPEP(final AxolotlAddress address) {
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Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.getDeviceId());
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try {
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@ -434,15 +434,6 @@ public class AxolotlService {
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AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
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if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
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&& !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
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if (flushWaitingQueueAfterFetch && conversation != null) {
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conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_AXOLOTL,
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new Conversation.OnMessageFound() {
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@Override
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public void onMessageFound(Message message) {
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processSending(message, false);
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}
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});
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}
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mXmppConnectionService.keyStatusUpdated();
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}
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}
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@ -537,7 +528,7 @@ public class AxolotlService {
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return addresses;
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}
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public boolean createSessionsIfNeeded(final Conversation conversation, final boolean flushWaitingQueueAfterFetch) {
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public boolean createSessionsIfNeeded(final Conversation conversation) {
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Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
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boolean newSessions = false;
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Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
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@ -546,7 +537,9 @@ public class AxolotlService {
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FetchStatus status = fetchStatusMap.get(address);
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if (status == null || status == FetchStatus.ERROR) {
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fetchStatusMap.put(address, FetchStatus.PENDING);
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this.buildSessionFromPEP(conversation, address, flushWaitingQueueAfterFetch);
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this.buildSessionFromPEP(address);
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newSessions = true;
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} else if (status == FetchStatus.PENDING) {
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newSessions = true;
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} else {
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
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@ -564,41 +557,53 @@ public class AxolotlService {
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}
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@Nullable
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private XmppAxolotlMessage buildHeader(Contact contact) {
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final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
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contact.getJid().toBareJid(), getOwnDeviceId());
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Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
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Set<XmppAxolotlSession> ownSessions = findOwnSessions();
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if (contactSessions.isEmpty()) {
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return null;
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}
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
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for (XmppAxolotlSession session : contactSessions) {
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Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
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axolotlMessage.addDevice(session);
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}
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
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for (XmppAxolotlSession session : ownSessions) {
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Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
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axolotlMessage.addDevice(session);
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}
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return axolotlMessage;
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}
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@Nullable
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public XmppAxolotlMessage encrypt(Message message) {
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XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
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if (axolotlMessage != null) {
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final String content;
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if (message.hasFileOnRemoteHost()) {
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content = message.getFileParams().url.toString();
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} else {
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content = message.getBody();
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}
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final XmppAxolotlMessage axolotlMessage;
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try {
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axolotlMessage = new XmppAxolotlMessage(message.getContact().getJid().toBareJid(),
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getOwnDeviceId(), content);
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axolotlMessage.encrypt(content);
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} catch (CryptoFailedException e) {
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Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
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return null;
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}
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if (findSessionsforContact(message.getContact()).isEmpty()) {
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return null;
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}
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
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for (XmppAxolotlSession session : findSessionsforContact(message.getContact())) {
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Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
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axolotlMessage.addKeyElement(session.processSending(axolotlMessage.getInnerKey()));
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}
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
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for (XmppAxolotlSession session : findOwnSessions()) {
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Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
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axolotlMessage.addKeyElement(session.processSending(axolotlMessage.getInnerKey()));
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}
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return axolotlMessage;
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}
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private void processSending(final Message message, final boolean delay) {
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public void preparePayloadMessage(final Message message, final boolean delay) {
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executor.execute(new Runnable() {
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@Override
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public void run() {
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@ -615,13 +620,14 @@ public class AxolotlService {
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});
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}
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public void prepareMessage(final Message message, final boolean delay) {
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if (!messageCache.containsKey(message.getUuid())) {
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boolean newSessions = createSessionsIfNeeded(message.getConversation(), true);
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if (!newSessions) {
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this.processSending(message, delay);
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}
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public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
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executor.execute(new Runnable() {
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@Override
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public void run() {
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XmppAxolotlMessage axolotlMessage = buildHeader(contact);
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onMessageCreatedCallback.run(axolotlMessage);
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}
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});
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}
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public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
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@ -653,26 +659,15 @@ public class AxolotlService {
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newSession = true;
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}
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for (XmppAxolotlMessage.XmppAxolotlKeyElement keyElement : message.getKeyElements()) {
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if (keyElement.getRecipientDeviceId() == getOwnDeviceId()) {
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found axolotl keyElement matching own device ID, processing...");
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byte[] payloadKey = session.processReceiving(keyElement);
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if (payloadKey != null) {
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Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got payload key from axolotl keyElement. Decrypting message...");
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try {
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plaintextMessage = message.decrypt(session, payloadKey, session.getFingerprint());
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} catch (CryptoFailedException e) {
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Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
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break;
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}
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}
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plaintextMessage = message.decrypt(session, getOwnDeviceId());
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Integer preKeyId = session.getPreKeyId();
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if (preKeyId != null) {
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publishBundlesIfNeeded();
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session.resetPreKeyId();
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}
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break;
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}
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} catch (CryptoFailedException e) {
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Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
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}
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if (newSession && plaintextMessage != null) {
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@ -1,6 +1,5 @@
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package eu.siacs.conversations.crypto.axolotl;
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import android.support.annotation.Nullable;
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import android.util.Base64;
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import android.util.Log;
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@ -9,8 +8,9 @@ import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.SecureRandom;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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@ -26,9 +26,11 @@ import eu.siacs.conversations.xml.Element;
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import eu.siacs.conversations.xmpp.jid.Jid;
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public class XmppAxolotlMessage {
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public static final String TAGNAME = "encrypted";
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public static final String CONTAINERTAG = "encrypted";
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public static final String HEADER = "header";
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public static final String SOURCEID = "sid";
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public static final String KEYTAG = "key";
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public static final String REMOTEID = "rid";
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public static final String IVTAG = "iv";
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public static final String PAYLOAD = "payload";
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@ -39,54 +41,15 @@ public class XmppAxolotlMessage {
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private byte[] innerKey;
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private byte[] ciphertext = null;
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private byte[] iv = null;
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private final Set<XmppAxolotlKeyElement> keyElements;
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private final Map<Integer, byte[]> keys;
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private final Jid from;
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private final int sourceDeviceId;
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public static class XmppAxolotlKeyElement {
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public static final String TAGNAME = "key";
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public static final String REMOTEID = "rid";
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private final int recipientDeviceId;
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private final byte[] content;
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public XmppAxolotlKeyElement(int deviceId, byte[] content) {
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this.recipientDeviceId = deviceId;
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this.content = content;
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}
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public XmppAxolotlKeyElement(Element keyElement) {
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if (TAGNAME.equals(keyElement.getName())) {
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this.recipientDeviceId = Integer.parseInt(keyElement.getAttribute(REMOTEID));
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this.content = Base64.decode(keyElement.getContent(), Base64.DEFAULT);
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} else {
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throw new IllegalArgumentException("Argument not a <" + TAGNAME + "> Element!");
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}
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}
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public int getRecipientDeviceId() {
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return recipientDeviceId;
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}
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public byte[] getContents() {
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return content;
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}
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public Element toXml() {
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Element keyElement = new Element(TAGNAME);
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keyElement.setAttribute(REMOTEID, getRecipientDeviceId());
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keyElement.setContent(Base64.encodeToString(getContents(), Base64.DEFAULT));
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return keyElement;
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}
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}
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public static class XmppAxolotlPlaintextMessage {
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private final XmppAxolotlSession session;
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private final String plaintext;
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private final String fingerprint;
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public XmppAxolotlPlaintextMessage(XmppAxolotlSession session, String plaintext, String fingerprint) {
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this.session = session;
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public XmppAxolotlPlaintextMessage(String plaintext, String fingerprint) {
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this.plaintext = plaintext;
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this.fingerprint = fingerprint;
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}
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@ -95,24 +58,28 @@ public class XmppAxolotlMessage {
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return plaintext;
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}
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public XmppAxolotlSession getSession() {
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return session;
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}
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public String getFingerprint() {
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return fingerprint;
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}
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}
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public XmppAxolotlMessage(Jid from, Element axolotlMessage) throws IllegalArgumentException {
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private XmppAxolotlMessage(final Element axolotlMessage, final Jid from) throws IllegalArgumentException {
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this.from = from;
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Element header = axolotlMessage.findChild(HEADER);
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this.sourceDeviceId = Integer.parseInt(header.getAttribute(SOURCEID));
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this.keyElements = new HashSet<>();
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for (Element keyElement : header.getChildren()) {
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List<Element> keyElements = header.getChildren();
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this.keys = new HashMap<>(keyElements.size());
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for (Element keyElement : keyElements) {
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switch (keyElement.getName()) {
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case XmppAxolotlKeyElement.TAGNAME:
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keyElements.add(new XmppAxolotlKeyElement(keyElement));
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case KEYTAG:
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try {
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Integer recipientId = Integer.parseInt(keyElement.getAttribute(REMOTEID));
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byte[] key = Base64.decode(keyElement.getContent(), Base64.DEFAULT);
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this.keys.put(recipientId, key);
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} catch (NumberFormatException e) {
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throw new IllegalArgumentException(e);
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}
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break;
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case IVTAG:
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if (this.iv != null) {
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@ -134,14 +101,13 @@ public class XmppAxolotlMessage {
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public XmppAxolotlMessage(Jid from, int sourceDeviceId) {
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this.from = from;
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this.sourceDeviceId = sourceDeviceId;
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this.keyElements = new HashSet<>();
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this.keys = new HashMap<>();
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this.iv = generateIv();
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this.innerKey = generateKey();
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}
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public XmppAxolotlMessage(Jid from, int sourceDeviceId, String plaintext) throws CryptoFailedException {
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this(from, sourceDeviceId);
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this.encrypt(plaintext);
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public static XmppAxolotlMessage fromElement(Element element, Jid from) {
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return new XmppAxolotlMessage(element, from);
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}
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private static byte[] generateKey() {
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@ -162,7 +128,7 @@ public class XmppAxolotlMessage {
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return iv;
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}
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private void encrypt(String plaintext) throws CryptoFailedException {
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public void encrypt(String plaintext) throws CryptoFailedException {
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try {
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SecretKey secretKey = new SecretKeySpec(innerKey, KEYTYPE);
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IvParameterSpec ivSpec = new IvParameterSpec(iv);
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@ -189,13 +155,10 @@ public class XmppAxolotlMessage {
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return ciphertext;
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}
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public Set<XmppAxolotlKeyElement> getKeyElements() {
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return keyElements;
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}
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public void addKeyElement(@Nullable XmppAxolotlKeyElement keyElement) {
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if (keyElement != null) {
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keyElements.add(keyElement);
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public void addDevice(XmppAxolotlSession session) {
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byte[] key = session.processSending(innerKey);
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if (key != null) {
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keys.put(session.getRemoteAddress().getDeviceId(), key);
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}
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}
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@ -207,12 +170,15 @@ public class XmppAxolotlMessage {
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return this.iv;
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}
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public Element toXml() {
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Element encryptionElement = new Element(TAGNAME, AxolotlService.PEP_PREFIX);
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public Element toElement() {
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Element encryptionElement = new Element(CONTAINERTAG, AxolotlService.PEP_PREFIX);
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Element headerElement = encryptionElement.addChild(HEADER);
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headerElement.setAttribute(SOURCEID, sourceDeviceId);
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for (XmppAxolotlKeyElement header : keyElements) {
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headerElement.addChild(header.toXml());
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for (Map.Entry<Integer, byte[]> keyEntry : keys.entrySet()) {
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Element keyElement = new Element(KEYTAG);
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keyElement.setAttribute(REMOTEID, keyEntry.getKey());
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keyElement.setContent(Base64.encodeToString(keyEntry.getValue(), Base64.DEFAULT));
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headerElement.addChild(keyElement);
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}
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headerElement.addChild(IVTAG).setContent(Base64.encodeToString(iv, Base64.DEFAULT));
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if (ciphertext != null) {
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@ -222,11 +188,16 @@ public class XmppAxolotlMessage {
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return encryptionElement;
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}
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public byte[] unpackKey(XmppAxolotlSession session, Integer sourceDeviceId) {
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byte[] encryptedKey = keys.get(sourceDeviceId);
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return (encryptedKey != null) ? session.processReceiving(encryptedKey) : null;
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}
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public XmppAxolotlPlaintextMessage decrypt(XmppAxolotlSession session, byte[] key, String fingerprint) throws CryptoFailedException {
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public XmppAxolotlPlaintextMessage decrypt(XmppAxolotlSession session, Integer sourceDeviceId) throws CryptoFailedException {
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XmppAxolotlPlaintextMessage plaintextMessage = null;
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byte[] key = unpackKey(session, sourceDeviceId);
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if (key != null) {
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try {
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Cipher cipher = Cipher.getInstance(CIPHERMODE, PROVIDER);
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SecretKeySpec keySpec = new SecretKeySpec(key, KEYTYPE);
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IvParameterSpec ivSpec = new IvParameterSpec(iv);
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@ -234,13 +205,14 @@ public class XmppAxolotlMessage {
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cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
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String plaintext = new String(cipher.doFinal(ciphertext));
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plaintextMessage = new XmppAxolotlPlaintextMessage(session, plaintext, fingerprint);
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plaintextMessage = new XmppAxolotlPlaintextMessage(plaintext, session.getFingerprint());
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} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
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| InvalidAlgorithmParameterException | IllegalBlockSizeException
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| BadPaddingException | NoSuchProviderException e) {
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throw new CryptoFailedException(e);
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}
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}
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return plaintextMessage;
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}
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}
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@ -69,7 +69,7 @@ public class XmppAxolotlSession {
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}
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@Nullable
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public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlKeyElement incomingHeader) {
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public byte[] processReceiving(byte[] encryptedKey) {
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byte[] plaintext = null;
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SQLiteAxolotlStore.Trust trust = getTrust();
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switch (trust) {
|
||||
|
|
@ -79,7 +79,7 @@ public class XmppAxolotlSession {
|
|||
case TRUSTED:
|
||||
try {
|
||||
try {
|
||||
PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
|
||||
PreKeyWhisperMessage message = new PreKeyWhisperMessage(encryptedKey);
|
||||
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "PreKeyWhisperMessage received, new session ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
|
||||
String fingerprint = message.getIdentityKey().getFingerprint().replaceAll("\\s", "");
|
||||
if (this.fingerprint != null && !this.fingerprint.equals(fingerprint)) {
|
||||
|
|
@ -93,7 +93,7 @@ public class XmppAxolotlSession {
|
|||
}
|
||||
} catch (InvalidMessageException | InvalidVersionException e) {
|
||||
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "WhisperMessage received");
|
||||
WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
|
||||
WhisperMessage message = new WhisperMessage(encryptedKey);
|
||||
plaintext = cipher.decrypt(message);
|
||||
} catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
|
||||
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error decrypting axolotl header, " + e.getClass().getName() + ": " + e.getMessage());
|
||||
|
|
@ -117,14 +117,11 @@ public class XmppAxolotlSession {
|
|||
}
|
||||
|
||||
@Nullable
|
||||
public XmppAxolotlMessage.XmppAxolotlKeyElement processSending(@NonNull byte[] outgoingMessage) {
|
||||
public byte[] processSending(@NonNull byte[] outgoingMessage) {
|
||||
SQLiteAxolotlStore.Trust trust = getTrust();
|
||||
if (trust == SQLiteAxolotlStore.Trust.TRUSTED) {
|
||||
CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
|
||||
XmppAxolotlMessage.XmppAxolotlKeyElement header =
|
||||
new XmppAxolotlMessage.XmppAxolotlKeyElement(remoteAddress.getDeviceId(),
|
||||
ciphertextMessage.serialize());
|
||||
return header;
|
||||
return ciphertextMessage.serialize();
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -63,7 +63,7 @@ public class MessageGenerator extends AbstractGenerator {
|
|||
if (axolotlMessage == null) {
|
||||
return null;
|
||||
}
|
||||
packet.setAxolotlMessage(axolotlMessage.toXml());
|
||||
packet.setAxolotlMessage(axolotlMessage.toElement());
|
||||
return packet;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -99,7 +99,7 @@ public class MessageParser extends AbstractParser implements
|
|||
private Message parseAxolotlChat(Element axolotlMessage, Jid from, String id, Conversation conversation, int status) {
|
||||
Message finishedMessage = null;
|
||||
AxolotlService service = conversation.getAccount().getAxolotlService();
|
||||
XmppAxolotlMessage xmppAxolotlMessage = new XmppAxolotlMessage(from.toBareJid(), axolotlMessage);
|
||||
XmppAxolotlMessage xmppAxolotlMessage = XmppAxolotlMessage.fromElement(axolotlMessage, from.toBareJid());
|
||||
XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = service.processReceiving(xmppAxolotlMessage);
|
||||
if(plaintextMessage != null) {
|
||||
finishedMessage = new Message(conversation, plaintextMessage.getPlaintext(), Message.ENCRYPTION_AXOLOTL, status);
|
||||
|
|
@ -272,7 +272,7 @@ public class MessageParser extends AbstractParser implements
|
|||
final String body = packet.getBody();
|
||||
final Element mucUserElement = packet.findChild("x", "http://jabber.org/protocol/muc#user");
|
||||
final String pgpEncrypted = packet.findChildContent("x", "jabber:x:encrypted");
|
||||
final Element axolotlEncrypted = packet.findChild(XmppAxolotlMessage.TAGNAME, AxolotlService.PEP_PREFIX);
|
||||
final Element axolotlEncrypted = packet.findChild(XmppAxolotlMessage.CONTAINERTAG, AxolotlService.PEP_PREFIX);
|
||||
int status;
|
||||
final Jid counterpart;
|
||||
final Jid to = packet.getTo();
|
||||
|
|
|
|||
|
|
@ -764,7 +764,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
|
|||
} else {
|
||||
XmppAxolotlMessage axolotlMessage = account.getAxolotlService().fetchAxolotlMessageFromCache(message);
|
||||
if (axolotlMessage == null) {
|
||||
account.getAxolotlService().prepareMessage(message,delay);
|
||||
account.getAxolotlService().preparePayloadMessage(message, delay);
|
||||
message.setAxolotlFingerprint(account.getAxolotlService().getOwnPublicKey().getFingerprint().replaceAll("\\s", ""));
|
||||
} else {
|
||||
packet = mMessageGenerator.generateAxolotlChat(message, axolotlMessage);
|
||||
|
|
|
|||
|
|
@ -1265,7 +1265,7 @@ public class ConversationActivity extends XmppActivity
|
|||
|| !axolotlService.findDevicesWithoutSession(mSelectedConversation).isEmpty();
|
||||
boolean hasNoTrustedKeys = axolotlService.getNumTrustedKeys(mSelectedConversation.getContact()) == 0;
|
||||
if( hasPendingKeys || hasNoTrustedKeys) {
|
||||
axolotlService.createSessionsIfNeeded(mSelectedConversation, false);
|
||||
axolotlService.createSessionsIfNeeded(mSelectedConversation);
|
||||
Intent intent = new Intent(getApplicationContext(), TrustKeysActivity.class);
|
||||
intent.putExtra("contact", mSelectedConversation.getContact().getJid().toBareJid().toString());
|
||||
intent.putExtra("account", mSelectedConversation.getAccount().getJid().toBareJid().toString());
|
||||
|
|
|
|||
Loading…
Reference in New Issue