Blowfish key is now generate from client's handshake packet.

FFXIVClassic_Lobby_Server/packets/receive/SecurityHandshakePacket.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FFXIVClassic_Lobby_Server.packets.receive
+{
+    class SecurityHandshakePacket
+    {
+        public string ticketPhrase;
+        public uint clientNumber;
+
+        public bool invalidPacket = false;
+
+        public SecurityHandshakePacket(byte[] data)
+        {
+            using (MemoryStream mem = new MemoryStream(data))
+            {
+                using (BinaryReader binReader = new BinaryReader(mem))
+                {
+                    try
+                    {
+                        binReader.BaseStream.Seek(0x34, SeekOrigin.Begin);
+                        ticketPhrase = Encoding.ASCII.GetString(binReader.ReadBytes(0x40)).Trim(new[] { '\0' });
+                        clientNumber = binReader.ReadUInt32();
+                    }
+                    catch (Exception){
+                        invalidPacket = true;
+                    }
+                }
+            }
+        }
+    }
+}