如何为XMPP android的聊天节实现OMEMO加密

Question

美好的一天！！！

我尝试使用 OMEMO 进行加密以使用 XMPP 进行聊天，但在进行实际加密时遇到了设备列表问题。

按照以下步骤，

1. OMEMO 服务注册
2. 生成的设备 ID
3. 生成的指纹
4. 信任 OMEMO 身份
5. 使用 MEMO 管理器加密

6. 使用 XMPP 连接对象发送消息。

   请检查以下代码， 请注意，我对存储文件一无所知，因此我创建了一个本地文件并在此处给出。我没有找到任何关于相同的文档。如果有人知道，也请告诉我。

      try {
   
           var messageToSend = tMessagetext!!.text.toString();
   
   
           var mFriendJID = "abc@localhost/yyy";
   
   
           val jidFriend = JidCreate.from(mFriendJID);
   
           val jidBare = JidCreate.bareFrom(mFriendJID);
   
           val msg = Message(jidFriend, Message.Type.chat);
   
           msg.setBody(messageToSend);
   
           SignalOmemoService.acknowledgeLicense();
           if (!SignalOmemoService.isServiceRegistered())
               SignalOmemoService.setup();
   
           val service = SignalOmemoService.getInstance()
   
           val file = File(Environment.getExternalStorageDirectory().absolutePath,"myAppFile.txt");
   
           OmemoConfiguration.setFileBasedOmemoStoreDefaultPath(file);
   
   
           val memomanager = OmemoManager.getInstanceFor(ChatService.xmppConnection)
   
           val  device = memomanager.ownDevice
   
   
           Log.e(TAG, device.deviceId.toString()+", "+device.jid);
           val fingerPrint = memomanager.getFingerprint(device)
   
   
           Log.e(TAG, fingerPrint.toString());
           memomanager.trustOmemoIdentity(device, fingerPrint);
   
           val encryptedMessage = memomanager!!.encrypt(jidBare, messageToSend)
   
           ChatService.xmppConnection!!.sendStanza(encryptedMessage)
           tMessagetext!!.text.clear();
   
       }catch (e :java.lang.Exception){
           e.printStackTrace()
       }
   

我得到的错误是，

OmemoService: Could not fetch device list of abc@localhost: org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error reply received from abc@localhost: XMPPError: service-unavailable - cancel
    org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error reply received from abc@localhost: XMPPError: service-unavailable - cancel
        at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:268)
        at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:219)
        at org.jivesoftware.smackx.pubsub.LeafNode.getItems(LeafNode.java:196)
        at org.jivesoftware.smackx.pubsub.LeafNode.getItems(LeafNode.java:189)
        at org.jivesoftware.smackx.pubsub.LeafNode.getItems(LeafNode.java:136)
        at org.jivesoftware.smackx.pubsub.PubSubManager.getLeafNodeProsodyWorkaround(PubSubManager.java:350)
        at org.jivesoftware.smackx.pubsub.PubSubManager.getLeafNode(PubSubManager.java:333)
        at org.jivesoftware.smackx.omemo.OmemoService.fetchDeviceListNode(OmemoService.java:435)
        at org.jivesoftware.smackx.omemo.OmemoService.fetchDeviceList(OmemoService.java:452)
        at org.jivesoftware.smackx.omemo.OmemoService.refreshDeviceList(OmemoService.java:504)
        at org.jivesoftware.smackx.omemo.OmemoService.buildOrCreateOmemoSessionsFromBundles(OmemoService.java:605)
        at org.jivesoftware.smackx.omemo.OmemoService.processSendingMessage(OmemoService.java:810)
        at org.jivesoftware.smackx.omemo.OmemoService.processSendingMessage(OmemoService.java:787)
        at org.jivesoftware.smackx.omemo.OmemoManager.encrypt(OmemoManager.java:209)
        at com.abcd.androidChatapp.MainActivity.onSendMessage(MainActivity.kt:347)
        at java.lang.reflect.Method.invoke(Native Method)
        at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
        at android.view.View.performClick(View.java:6312)
        at android.view.View$PerformClick.run(View.java:24943)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:192)
        at android.app.ActivityThread.main(ActivityThread.java:6754)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)

请让我知道此代码中的问题，以便我继续前进。让我知道您是否有关于相同的适当文档，以便我可以深入了解此过程中到底发生了什么。

提前谢谢你。

Answer 1

这是我使用的代码。

//Setup stream
SignalOmemoService.acknowledgeLicense();
SignalOmemoService.setup();

SignalOmemoService service = (SignalOmemoService) SignalOmemoService.getInstance();
service.setOmemoStoreBackend(new SignalCachingOmemoStore(new SignalFileBasedOmemoStore(mContext.getFilesDir())));

omemoManager = OmemoManager.getInstanceFor(getSafeConnection(), deviceId);
omemoManager.setTrustCallback(this);
omemoManager.addOmemoMessageListener(this);
omemoManager.addOmemoMucMessageListener(this);

//After login
omemoManager.purgeDeviceList();
omemoManager.initialize();

//send message
BareJid bareJid = JidCreate.bareFrom(jid);
OmemoMessage.Sent encMesage = omemoManager.encrypt(bareJid, msgText);
Message newMessage = encMesage.asMessage(bareJid);
xmppStream.sendMessage(newMessage);

另外你需要检查this