From 186982b458fd1d11926b7116169df51b5547c0fc Mon Sep 17 00:00:00 2001
From: Matthew Toro <matthewtoro@live.com>
Date: Sat, 28 Mar 2026 00:07:18 -0400
Subject: [PATCH] feat: add basic authentication packet handling.

---
 Minecraft.World/AuthPackets.cpp               | 47 +++++++++++++++++++
 Minecraft.World/AuthPackets.h                 | 36 ++++++++++++++
 Minecraft.World/Packet.cpp                    |  1 +
 Minecraft.World/PacketListener.cpp            |  5 ++
 Minecraft.World/PacketListener.h              |  4 ++
 Minecraft.World/cmake/sources/Common.cmake    |  2 +
 .../net.minecraft.network.packet.h            |  1 +
 7 files changed, 96 insertions(+)
 create mode 100644 Minecraft.World/AuthPackets.cpp
 create mode 100644 Minecraft.World/AuthPackets.h

diff --git a/Minecraft.World/AuthPackets.cpp b/Minecraft.World/AuthPackets.cpp
new file mode 100644
index 000000000..4bd2bb953
--- /dev/null
+++ b/Minecraft.World/AuthPackets.cpp
@@ -0,0 +1,47 @@
+#include "stdafx.h"
+#include "InputOutputStream.h"
+#include "PacketListener.h"
+#include "AuthPackets.h"
+
+AuthPacket::AuthPacket(AuthStage stage, vector<pair<wstring, wstring>> fields)
+	: stage(stage), fields(std::move(fields))
+{
+}
+
+void AuthPacket::read(DataInputStream *dis)
+{
+	stage = static_cast<AuthStage>(dis->readByte());
+	short count = dis->readShort();
+	fields.clear();
+	fields.reserve(count);
+	for (short i = 0; i < count; i++)
+	{
+		wstring key = readUtf(dis, 256);
+		wstring value = readUtf(dis, 4096);
+		fields.emplace_back(std::move(key), std::move(value));
+	}
+}
+
+void AuthPacket::write(DataOutputStream *dos)
+{
+	dos->writeByte(static_cast<byte>(stage));
+	dos->writeShort(static_cast<short>(fields.size()));
+	for (const auto &field : fields)
+	{
+		writeUtf(field.first, dos);
+		writeUtf(field.second, dos);
+	}
+}
+
+void AuthPacket::handle(PacketListener *listener)
+{
+	listener->handleAuth(shared_from_this());
+}
+
+int AuthPacket::getEstimatedSize()
+{
+	int size = 1 + 2;
+	for (const auto &field : fields)
+		size += 4 + static_cast<int>((field.first.length() + field.second.length()) * sizeof(wchar_t));
+	return size;
+}
diff --git a/Minecraft.World/AuthPackets.h b/Minecraft.World/AuthPackets.h
new file mode 100644
index 000000000..6c73067f1
--- /dev/null
+++ b/Minecraft.World/AuthPackets.h
@@ -0,0 +1,36 @@
+#pragma once
+using namespace std;
+
+#include "Packet.h"
+
+enum class AuthStage : uint8_t
+{
+	ANNOUNCE_VERSION,
+	DECLARE_SCHEME,
+	ACCEPT_SCHEME,
+	SCHEME_SETTINGS,
+	BEGIN_AUTH,
+	AUTH_DATA,
+	AUTH_DONE,
+	ASSIGN_IDENTITY,
+	CONFIRM_IDENTITY,
+	AUTH_SUCCESS,
+	AUTH_FAILURE
+};
+
+class AuthPacket : public Packet, public enable_shared_from_this<AuthPacket>
+{
+public:
+	AuthStage stage;
+	vector<pair<wstring, wstring>> fields;
+
+	AuthPacket(AuthStage stage = AuthStage::ANNOUNCE_VERSION, vector<pair<wstring, wstring>> fields = {});
+
+	virtual void read(DataInputStream *dis);
+	virtual void write(DataOutputStream *dos);
+	virtual void handle(PacketListener *listener);
+	virtual int getEstimatedSize();
+
+	static shared_ptr<Packet> create() { return std::make_shared<AuthPacket>(); }
+	virtual int getId() { return 72; }
+};
diff --git a/Minecraft.World/Packet.cpp b/Minecraft.World/Packet.cpp
index 05bf932dc..325976c63 100644
--- a/Minecraft.World/Packet.cpp
+++ b/Minecraft.World/Packet.cpp
@@ -150,6 +150,7 @@ void Packet::staticCtor()
 	//map(253, true, false, ServerAuthDataPacket.class);
 	map(254, false, true, false, false, typeid(GetInfoPacket), GetInfoPacket::create); // TODO New for 1.8.2 - Needs sendToAny?
 	map(255, true, true, true, false, typeid(DisconnectPacket), DisconnectPacket::create);
+	map(72, true, true, true, false, typeid(AuthPacket), AuthPacket::create);
 }
 
 IllegalArgumentException::IllegalArgumentException(const wstring& information)
diff --git a/Minecraft.World/PacketListener.cpp b/Minecraft.World/PacketListener.cpp
index 09fbb0525..490922c79 100644
--- a/Minecraft.World/PacketListener.cpp
+++ b/Minecraft.World/PacketListener.cpp
@@ -491,3 +491,8 @@ void PacketListener::handleGameCommand(shared_ptr<GameCommandPacket> packet)
 {
 	onUnhandledPacket( (shared_ptr<Packet> ) packet);
 }
+
+void PacketListener::handleAuth(shared_ptr<AuthPacket> packet)
+{
+	onUnhandledPacket( (shared_ptr<Packet> ) packet);
+}
diff --git a/Minecraft.World/PacketListener.h b/Minecraft.World/PacketListener.h
index f63b6bc7f..9f5b1b9de 100644
--- a/Minecraft.World/PacketListener.h
+++ b/Minecraft.World/PacketListener.h
@@ -111,6 +111,7 @@ class KickPlayerPacket;
 class AdditionalModelPartsPacket;
 class XZPacket;
 class GameCommandPacket;
+class AuthPacket;
 
 class PacketListener
 {
@@ -227,4 +228,7 @@ public:
 	virtual void handleKickPlayer(shared_ptr<KickPlayerPacket> packet);
 	virtual void handleXZ(shared_ptr<XZPacket> packet);
 	virtual void handleGameCommand(shared_ptr<GameCommandPacket> packet);
+
+	// MCConsoles Auth
+	virtual void handleAuth(shared_ptr<AuthPacket> packet);
 };
diff --git a/Minecraft.World/cmake/sources/Common.cmake b/Minecraft.World/cmake/sources/Common.cmake
index 8a4d68330..544d1e571 100644
--- a/Minecraft.World/cmake/sources/Common.cmake
+++ b/Minecraft.World/cmake/sources/Common.cmake
@@ -259,6 +259,8 @@ set(_MINECRAFT_WORLD_COMMON_NET_MINECRAFT_NETWORK_PACKET
   "${CMAKE_CURRENT_SOURCE_DIR}/AddPlayerPacket.h"
   "${CMAKE_CURRENT_SOURCE_DIR}/AnimatePacket.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/AnimatePacket.h"
+  "${CMAKE_CURRENT_SOURCE_DIR}/AuthPackets.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/AuthPackets.h"
   "${CMAKE_CURRENT_SOURCE_DIR}/AwardStatPacket.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/AwardStatPacket.h"
   "${CMAKE_CURRENT_SOURCE_DIR}/BlockRegionUpdatePacket.cpp"
diff --git a/Minecraft.World/net.minecraft.network.packet.h b/Minecraft.World/net.minecraft.network.packet.h
index c1d52d147..2981508e3 100644
--- a/Minecraft.World/net.minecraft.network.packet.h
+++ b/Minecraft.World/net.minecraft.network.packet.h
@@ -108,4 +108,5 @@
 #include "KickPlayerPacket.h"
 #include "XZPacket.h"
 #include "GameCommandPacket.h"
+#include "AuthPackets.h"