如何为XMPP android的聊天节实现OMEMO加密

Question

美好的一天!!!

我尝试了使用OMEMO进行加密以使用XMPP进行聊天，但是在进行实际加密时出现了设备列表问题。

以下步骤，

1. OMEMO服务注册
2. 生成设备ID
3. 生成指纹
4. 信任OMEMO身份
5. 使用OMEMO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，我对存储文件不了解，因此我创建了本地文件并在此处给出。我没有找到相同的任何文档。如果有人知道，也请让我知道。

      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。让我知道您是否拥有与此相关的适当文档，以便我深入了解该过程中到底发生了什么。

提前谢谢您。

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);

还需要检查this