Introduce some UUID utilities for eventual auth support.

src/main/java/com/velocitypowered/proxy/Velocity.java

@@ -1,7 +1,5 @@
 package com.velocitypowered.proxy;
 
-import com.velocitypowered.proxy.connection.VelocityServer;
-
 public class Velocity {
     public static void main(String... args) throws InterruptedException {
         VelocityServer server = new VelocityServer();

src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -1,5 +1,6 @@
-package com.velocitypowered.proxy.connection;
+package com.velocitypowered.proxy;
 
+import com.velocitypowered.proxy.connection.MinecraftConnection;
 import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.protocol.netty.MinecraftPipelineUtils;
 import com.velocitypowered.proxy.connection.client.HandshakeSessionHandler;
@@ -10,11 +11,16 @@ import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.channel.socket.nio.NioSocketChannel;
 
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+
 public class VelocityServer {
     private static VelocityServer server;
 
     private EventLoopGroup bossGroup;
     private EventLoopGroup childGroup;
+    private KeyPair serverKeyPair;
 
     public VelocityServer() {
 
@@ -25,6 +31,16 @@ public class VelocityServer {
     }
 
     public void initialize() {
+        // Create a key pair
+        try {
+            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+            generator.initialize(1024);
+            serverKeyPair = generator.generateKeyPair();
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Unable to generate server encryption key", e);
+        }
+
+        // Start the listener
         bossGroup = new NioEventLoopGroup();
         childGroup = new NioEventLoopGroup();
         server = this;

src/main/java/com/velocitypowered/proxy/connection/backend/ServerConnection.java

@@ -6,7 +6,7 @@ import com.velocitypowered.proxy.connection.MinecraftConnection;
 import com.velocitypowered.proxy.protocol.StateRegistry;
 import com.velocitypowered.proxy.data.ServerInfo;
 import com.velocitypowered.proxy.protocol.netty.MinecraftPipelineUtils;
-import com.velocitypowered.proxy.connection.VelocityServer;
+import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
 import io.netty.channel.*;
 

src/main/java/com/velocitypowered/proxy/connection/client/LoginSessionHandler.java

@@ -7,13 +7,12 @@ import com.velocitypowered.proxy.protocol.packets.ServerLogin;
 import com.velocitypowered.proxy.protocol.packets.ServerLoginSuccess;
 import com.velocitypowered.proxy.connection.MinecraftConnection;
 import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
-import com.velocitypowered.proxy.connection.VelocityServer;
+import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.connection.backend.ServerConnection;
 import com.velocitypowered.proxy.data.ServerInfo;
+import com.velocitypowered.proxy.util.UuidUtils;
 
 import java.net.InetSocketAddress;
-import java.nio.charset.StandardCharsets;
-import java.util.UUID;
 
 public class LoginSessionHandler implements MinecraftSessionHandler {
     private final MinecraftConnection inbound;
@@ -32,7 +31,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
         String username = ((ServerLogin) packet).getUsername();
         ServerLoginSuccess success = new ServerLoginSuccess();
         success.setUsername(username);
-        success.setUuid(generateOfflinePlayerUuid(username));
+        success.setUuid(UuidUtils.generateOfflinePlayerUuid(username));
         inbound.write(success);
 
         // Initiate a regular connection and move over to it.
@@ -45,7 +44,4 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
         connection.connect();
     }
 
-    private static UUID generateOfflinePlayerUuid(String username) {
-        return UUID.nameUUIDFromBytes(("OfflinePlayer:" + username).getBytes(StandardCharsets.UTF_8));
-    }
 }

src/main/java/com/velocitypowered/proxy/util/UuidUtils.java

@@ -0,0 +1,26 @@
+package com.velocitypowered.proxy.util;
+
+import com.google.common.base.Preconditions;
+
+import java.nio.charset.StandardCharsets;
+import java.util.UUID;
+
+public enum UuidUtils {
+    ;
+
+    public static UUID fromMojang(String id) {
+        Preconditions.checkNotNull(id, "id");
+        Preconditions.checkArgument(id.length() == 32, "Length is incorrect");
+        return UUID.fromString(
+                id.substring(0, 8) + "-" +
+                        id.substring(8, 12) + "-" +
+                        id.substring(12, 16) + "-" +
+                        id.substring(16, 20) + "-" +
+                        id.substring(20, 32)
+        );
+    }
+
+    public static UUID generateOfflinePlayerUuid(String username) {
+        return UUID.nameUUIDFromBytes(("OfflinePlayer:" + username).getBytes(StandardCharsets.UTF_8));
+    }
+}

src/test/java/com/velocitypowered/proxy/util/UuidUtilsTest.java

@@ -0,0 +1,26 @@
+package com.velocitypowered.proxy.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.UUID;
+
+import static org.junit.Assert.*;
+
+public class UuidUtilsTest {
+    private static final UUID VALID_UUID = UUID.fromString("6b501978-d3be-4f33-bcf6-6e7808f37a0d");
+    private static final String VALID_MOJANG_UUID = "6b501978d3be4f33bcf66e7808f37a0d";
+
+    private static final UUID TEST_OFFLINE_PLAYER_UUID = UUID.fromString("708f6260-183d-3912-bbde-5e279a5e739a");
+    private static final String TEST_OFFLINE_PLAYER = "tuxed";
+
+    @Test
+    public void fromMojang() {
+        Assert.assertEquals("UUIDs do not match", VALID_UUID, UuidUtils.fromMojang(VALID_MOJANG_UUID));
+    }
+
+    @Test
+    public void generateOfflinePlayerUuid() {
+        Assert.assertEquals("UUIDs do not match", TEST_OFFLINE_PLAYER_UUID, UuidUtils.generateOfflinePlayerUuid(TEST_OFFLINE_PLAYER));
+    }
+}