如何为XMPP android的聊天节实现OMEMO加密

Posted 2023-02-23

【中文标题】如何为XMPP android的聊天节实现OMEMO加密

【英文标题】：How to implement OMEMO encryption for chat stanza of XMPP android

【发布时间】：2020-01-23 12:22:14

【问题描述】：

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，

OMEMO 服务注册 生成的设备 ID 生成的指纹 信任 OMEMO 身份 使用 MEMO 管理器加密

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。

【问题讨论】：

您能否获取应用发送和接收的 XMPP 流量日志？没有它就很难知道发生了什么。

【参考方案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