Basic support for minecraft 1.19 (#2084)

* merge commit from milutinke
* chat signature & encrypted login
* Bug fix :EncryptionResponse format error below 1.18.2
* Implemented chat command signature
* Chat message parsing and verification for 1.19
* Add signature settings
* Update Simplified Chinese Translation
* Clear up comments
* Fix wrong variable naming
* Bug fix: SignatureV2 Processing

MinecraftClient/Protocol/PlayerInfo.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MinecraftClient.Protocol.Keys;
+
+namespace MinecraftClient.Protocol
+{
+    public class PlayerInfo
+    {
+        public readonly Guid UUID;
+
+        public readonly string Name;
+
+        // Tuple<Name, Value, Signature(empty if there is no signature)
+        public readonly Tuple<string, string, string>[]? Property;
+
+        public int Gamemode;
+
+        public int Ping;
+
+        public string? DisplayName;
+
+        private readonly PublicKey? PublicKey;
+
+        private readonly DateTime? KeyExpiresAt;
+
+        public PlayerInfo(Guid uuid, string name, Tuple<string, string, string>[]? property, int gamemode, int ping, string? displayName, long? timeStamp, byte[]? publicKey, byte[]? signature)
+        {
+            UUID = uuid;
+            Name = name;
+            if (property != null)
+                Property = property;
+            Gamemode = gamemode;
+            Ping = ping;
+            DisplayName = displayName;
+            if (timeStamp != null && publicKey != null && signature != null)
+            {
+                DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds((long)timeStamp);
+                KeyExpiresAt = dateTimeOffset.UtcDateTime;
+                try
+                {
+                    PublicKey = new PublicKey(publicKey, signature);
+                }
+                catch (System.Security.Cryptography.CryptographicException)
+                {
+                    PublicKey = null;
+                }
+            }
+        }
+
+        public PlayerInfo(string name, Guid uuid)
+        {
+            Name = name;
+            UUID = uuid;
+            Gamemode = -1;
+            Ping = 0;
+        }
+
+        public bool IsKeyVaild()
+        {
+            return PublicKey != null && DateTime.Now.ToUniversalTime() > this.KeyExpiresAt;
+        }
+
+        public bool VerifyMessage(string message, Guid uuid, long timestamp, long salt, ref byte[] signature)
+        {
+            if (PublicKey == null)
+                return false;
+            else
+            {
+                string uuidString = uuid.ToString().Replace("-", string.Empty);
+
+                DateTimeOffset timeOffset = DateTimeOffset.FromUnixTimeMilliseconds(timestamp);
+
+                byte[] saltByte = BitConverter.GetBytes(salt);
+                Array.Reverse(saltByte);
+
+                return PublicKey.VerifyMessage(message, uuidString, timeOffset, ref saltByte, ref signature);
+            }
+        }
+    }
+}