Sign myTeamSpeak identity into clientinit

Adds an authenticator hook that appends the myTeamSpeak parameters to
clientinit/updatemytsid, and the per-connection challenge they sign.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/java/com/github/manevolent/ts3j/protocol/packet/handler/client/LocalClientHandlerConnecting.java

@@ -355,7 +355,8 @@ public class LocalClientHandlerConnecting extends LocalClientHandler {
                 )
         );
 
-        Ts3Debugging.debug(clientinit.build());
+        getClient().addMyTeamSpeakParameters(clientinit);
+        Ts3Debugging.debug("Sending clientinit");
 
         getClient().writePacket(new PacketBody2Command(ProtocolRole.CLIENT, clientinit));
     }

src/main/java/com/github/manevolent/ts3j/protocol/packet/transformation/PacketTransformation.java

@@ -32,6 +32,12 @@ public class PacketTransformation {
         return fakeMac;
     }
 
+    /** Connection binding used by myTeamSpeak, in the AES-128/SHA-256 protocol mode. */
+    public byte[] getMyTeamSpeakChallenge() {
+        return Ts3Crypt.hash256(ByteBuffer.allocate(6 + ivStruct.length)
+                .put(new byte[] {0x30, 8, 0, 0, 0, 0}).put(ivStruct).array());
+    }
+
     public Pair<byte[], byte[]> computeParameters(PacketHeader header) {
         ByteBuffer temporaryByteBuffer = ByteBuffer
                 .allocate(ivStruct.length == 20 ? 26 : 70)

src/main/java/com/github/manevolent/ts3j/protocol/socket/client/AbstractTeamspeakClientSocket.java

@@ -3,6 +3,7 @@ package com.github.manevolent.ts3j.protocol.socket.client;
 import com.github.manevolent.ts3j.command.CommandException;
 
 import com.github.manevolent.ts3j.command.*;
+import com.github.manevolent.ts3j.command.parameter.CommandSingleParameter;
 import com.github.manevolent.ts3j.identity.Identity;
 import com.github.manevolent.ts3j.protocol.NetworkPacket;
 import com.github.manevolent.ts3j.protocol.Packet;
@@ -36,6 +37,7 @@ import java.nio.*;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.function.Consumer;
+import java.util.function.Function;
 
 /**
  * Server/client common abstract client socket, used to interact with the UDP connection.  Provides most of the protocol
@@ -165,6 +167,21 @@ public abstract class AbstractTeamspeakClientSocket
         setTransformation(new PacketTransformation(parameters.getIvStruct(), parameters.getFakeSignature()));
     }
 
+    private volatile Function<byte[], Map<String, String>> myTeamSpeakAuthenticator;
+
+    /** Set before connecting; invoked after the handshake with this connection's challenge. */
+    public void setMyTeamSpeakAuthenticator(Function<byte[], Map<String, String>> authenticator) {
+        myTeamSpeakAuthenticator = authenticator;
+    }
+
+    public void addMyTeamSpeakParameters(Command command) {
+        Function<byte[], Map<String, String>> authenticator = myTeamSpeakAuthenticator;
+        if (authenticator == null) return;
+        Map<String, String> parameters = authenticator.apply(transformation.getMyTeamSpeakChallenge());
+        for (Map.Entry<String, String> entry : parameters.entrySet())
+            command.add(new CommandSingleParameter(entry.getKey(), entry.getValue()));
+    }
+
     protected abstract NetworkPacket readNetworkPacket(int timeout) throws IOException;
 
     protected abstract void writeNetworkPacket(NetworkPacket packet) throws IOException;