diff --git a/AUTHENTICATION.md b/AUTHENTICATION.md
new file mode 100644
index 0000000..f080a0e
--- /dev/null
+++ b/AUTHENTICATION.md
@@ -0,0 +1,269 @@
+# MySQL Authentication Implementation
+
+This document describes the MySQL authentication implementation for SuperSocket.MySQL that follows the MySQL protocol specification.
+
+## Overview
+
+The authentication system implements the standard MySQL handshake protocol:
+
+1. **Server Hello**: Server sends initial handshake packet with protocol version, server version, connection ID, and authentication challenge (salt)
+2. **Client Authentication**: Client responds with username, scrambled password, and other connection parameters
+3. **Server Response**: Server validates credentials and sends OK packet (success) or ERR packet (failure)
+
+## Architecture
+
+The implementation consists of several key components:
+
+### Core Classes
+
+#### `MySQLHandshakePacket`
+- Represents the initial handshake packet sent by the server
+- Contains protocol version, server version, connection ID, and 20-byte salt
+- Generates binary packet data according to MySQL protocol specification
+- Located: `src/SuperSocket.MySQL/Authentication/MySQLHandshakePacket.cs`
+
+#### `MySQLHandshakeResponsePacket`
+- Represents the client's authentication response
+- Parses client capabilities, username, scrambled password, and database name
+- Handles binary packet parsing from SuperSocket pipeline
+- Located: `src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponsePacket.cs`
+
+#### `MySQLAuthenticationHandler`
+- Coordinates the authentication flow
+- Implements MySQL native password scrambling algorithm (SHA1-based)
+- Validates credentials against hardcoded username/password ("test"/"test")
+- Generates OK and ERR response packets
+- Located: `src/SuperSocket.MySQL/Authentication/MySQLAuthenticationHandler.cs`
+
+#### `MySQLSession`
+- Extends SuperSocket AppSession to handle MySQL connections
+- Automatically sends handshake packet on connection
+- Manages authentication state and credential validation
+- Located: `src/SuperSocket.MySQL/Authentication/MySQLSession.cs`
+
+#### `MySQLHandshakeResponseFilter`
+- SuperSocket filter for parsing handshake response packets
+- Integrates with SuperSocket's PackagePartsPipelineFilter system
+- Located: `src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponseFilter.cs`
+
+## Usage
+
+### Basic Authentication Setup
+
+```csharp
+using SuperSocket.MySQL.Authentication;
+
+// Create authentication handler
+var authHandler = new MySQLAuthenticationHandler();
+
+// Generate handshake packet
+var handshake = authHandler.CreateHandshake();
+var handshakeBytes = handshake.ToBytes();
+
+// Send handshake to client
+await session.SendAsync(handshakeBytes);
+
+// Parse client response
+var response = MySQLHandshakeResponsePacket.ParseFromBytes(clientData, 0, clientData.Length);
+
+// Validate credentials
+var salt = handshake.GetFullSalt();
+bool isValid = authHandler.ValidateCredentials(response, salt);
+
+if (isValid)
+{
+    var okPacket = authHandler.CreateOkPacket();
+    await session.SendAsync(okPacket);
+}
+else
+{
+    var errorPacket = authHandler.CreateErrorPacket(1045, "Access denied");
+    await session.SendAsync(errorPacket);
+}
+```
+
+### SuperSocket Integration
+
+```csharp
+using SuperSocket.MySQL.Authentication;
+using SuperSocket.Server;
+
+// Create server with MySQL authentication
+var host = SuperSocketHostBuilder
+    .Create<MySQLHandshakeResponsePacket, MySQLHandshakeResponseFilter>()
+    .UseSession<MySQLSession>()
+    .ConfigureServices((context, services) =>
+    {
+        services.Configure<ServerOptions>(options =>
+        {
+            options.Listeners = new[]
+            {
+                new ListenOptions { Ip = "127.0.0.1", Port = 3306 }
+            };
+        });
+    })
+    .Build();
+
+await host.RunAsync();
+```
+
+### Custom Session Implementation
+
+```csharp
+public class CustomMySQLSession : MySQLSession
+{
+    protected override async ValueTask OnPackageReceived(MySQLHandshakeResponsePacket package)
+    {
+        if (!IsAuthenticated)
+        {
+            var success = await HandleAuthenticationAsync(package);
+            if (!success)
+            {
+                await CloseAsync();
+                return;
+            }
+            
+            // Authentication successful, ready for command processing
+            Logger?.LogInformation($"User {package.Username} authenticated successfully");
+        }
+        else
+        {
+            // Handle MySQL commands after authentication
+            await ProcessMySQLCommand(package);
+        }
+    }
+    
+    private async Task ProcessMySQLCommand(MySQLHandshakeResponsePacket package)
+    {
+        // Implement your MySQL command processing logic here
+        // This would typically involve switching to a different packet filter
+        // for handling SQL queries, prepared statements, etc.
+    }
+}
+```
+
+## Protocol Details
+
+### Handshake Packet Structure
+
+The handshake packet follows MySQL Protocol Version 10 format:
+
+```
+1 byte     - Protocol version (10)
+string     - Server version (null-terminated)
+4 bytes    - Connection ID
+8 bytes    - Authentication plugin data part 1
+1 byte     - Filler (0x00)
+2 bytes    - Capability flags (lower 2 bytes)
+1 byte     - Character set
+2 bytes    - Status flags
+2 bytes    - Capability flags (upper 2 bytes)
+1 byte     - Length of authentication plugin data
+10 bytes   - Reserved (all zeros)
+12 bytes   - Authentication plugin data part 2
+1 byte     - Null terminator
+string     - Authentication plugin name (null-terminated)
+```
+
+### Password Scrambling Algorithm
+
+The implementation uses MySQL's native password authentication:
+
+```
+SHA1(password) XOR SHA1(salt + SHA1(SHA1(password)))
+```
+
+Where:
+- `password` is the plaintext password
+- `salt` is the 20-byte challenge from the handshake packet
+- `SHA1()` is the SHA-1 hash function
+- `XOR` is bitwise exclusive OR
+
+### Authentication Flow
+
+1. **Connection Established**: Client connects to server
+2. **Server Hello**: Server immediately sends handshake packet with unique salt
+3. **Client Response**: Client sends handshake response with scrambled password
+4. **Validation**: Server validates username and password using salt
+5. **Result**: Server sends OK packet (authentication success) or ERR packet (failure)
+
+## Configuration
+
+### Hardcoded Credentials
+
+Currently, the system uses hardcoded credentials for simplicity:
+- Username: `"test"`
+- Password: `"test"`
+
+To modify credentials, update the `MySQLAuthenticationHandler` class:
+
+```csharp
+private readonly string _validUsername = "your_username";
+private readonly string _validPassword = "your_password";
+```
+
+### Server Information
+
+Default server information can be customized in `MySQLHandshakePacket`:
+
+```csharp
+public byte ProtocolVersion { get; set; } = 10;
+public string ServerVersion { get; set; } = "8.0.0-supersocket";
+public ushort CapabilityFlagsLower { get; set; } = 0xF7FF;
+public byte CharacterSet { get; set; } = 0x21; // utf8_general_ci
+```
+
+## Testing
+
+Basic tests are provided in `src/SuperSocket.MySQL/Tests/AuthenticationTest.cs`:
+
+```csharp
+// Test handshake packet generation
+AuthenticationTest.TestHandshakePacket();
+
+// Test password scrambling
+AuthenticationTest.TestPasswordScrambling();
+
+// Test OK/ERR packet generation
+AuthenticationTest.TestOkErrorPackets();
+
+// Run all tests
+AuthenticationTest.RunAllTests();
+```
+
+## Limitations
+
+This is a minimal implementation with the following limitations:
+
+1. **Single User**: Only supports one hardcoded username/password combination
+2. **No Database Support**: Database name in client response is ignored
+3. **Basic Capabilities**: Only implements essential capability flags
+4. **No SSL/TLS**: Does not support encrypted connections
+5. **No Prepared Statements**: Authentication only, no SQL processing
+6. **No Multi-Factor Auth**: Only supports password authentication
+
+## Security Considerations
+
+1. **Password Storage**: Passwords are hardcoded in source code (development only)
+2. **Salt Generation**: Uses cryptographically secure random number generator
+3. **Protocol Compliance**: Follows MySQL native password authentication standard
+4. **Connection Limits**: No built-in connection throttling or rate limiting
+
+## Future Enhancements
+
+Potential improvements for production use:
+
+1. **Database Integration**: Store user credentials in database
+2. **Multiple Auth Plugins**: Support for additional authentication methods
+3. **SSL/TLS Support**: Encrypted connection support
+4. **Configuration**: External configuration for server settings
+5. **Logging**: Comprehensive audit logging
+6. **Performance**: Connection pooling and optimization
+7. **Command Processing**: Full MySQL protocol command handling
+
+## References
+
+- [MySQL Protocol Documentation](https://dev.mysql.com/doc/dev/mysql-server/8.0.11/PAGE_PROTOCOL.html)
+- [MySQL Handshake Protocol](https://dev.mysql.com/doc/dev/mysql-server/8.0.11/page_protocol_connection_phase_packets_protocol_handshake_v10.html)
+- [MySQL Authentication](https://dev.mysql.com/doc/dev/mysql-server/8.0.11/page_protocol_connection_phase_packets_protocol_handshake_response.html)
+- [SuperSocket Documentation](https://docs.supersocket.net/)
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Authentication/MySQLAuthenticationHandler.cs b/src/SuperSocket.MySQL/Authentication/MySQLAuthenticationHandler.cs
new file mode 100644
index 0000000..872768b
--- /dev/null
+++ b/src/SuperSocket.MySQL/Authentication/MySQLAuthenticationHandler.cs
@@ -0,0 +1,173 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace SuperSocket.MySQL.Authentication
+{
+    /// <summary>
+    /// Handles MySQL authentication flow including handshake, challenge, and response validation.
+    /// Implements MySQL native password authentication using SHA1-based scrambling.
+    /// Based on MySQL Protocol specification:
+    /// https://dev.mysql.com/doc/dev/mysql-server/8.0.11/page_protocol_connection_phase_packets_protocol_handshake_v10.html
+    /// </summary>
+    public partial class MySQLAuthenticationHandler
+    {
+        private static uint _nextConnectionId = 1;
+        private readonly string _validUsername = "test";
+        private readonly string _validPassword = "test";
+
+        public MySQLHandshakePacket CreateHandshake()
+        {
+            var handshake = new MySQLHandshakePacket
+            {
+                ConnectionId = GetNextConnectionId()
+            };
+            return handshake;
+        }
+
+        public bool ValidateCredentials(MySQLHandshakeResponsePacket response, byte[] salt)
+        {
+            if (string.IsNullOrEmpty(response.Username))
+                return false;
+
+            // Check username
+            if (!string.Equals(response.Username, _validUsername, StringComparison.Ordinal))
+                return false;
+
+            // Validate password using MySQL native password scrambling
+            if (response.AuthResponse == null || response.AuthResponse.Length == 0)
+            {
+                // Empty password - only valid if expected password is also empty
+                return string.IsNullOrEmpty(_validPassword);
+            }
+
+            var expectedScramble = ScramblePassword(_validPassword, salt);
+            return CompareByteArrays(response.AuthResponse, expectedScramble);
+        }
+
+        public byte[] CreateOkPacket()
+        {
+            // MySQL OK packet format:
+            // Header (4 bytes) + OK byte (0x00) + affected_rows + last_insert_id + status_flags + warnings
+            var packet = new byte[11];
+            
+            // Packet length (7 bytes)
+            packet[0] = 0x07;
+            packet[1] = 0x00;
+            packet[2] = 0x00;
+            
+            // Packet sequence number
+            packet[3] = 0x02;
+            
+            // OK indicator
+            packet[4] = 0x00;
+            
+            // Affected rows (encoded integer)
+            packet[5] = 0x00;
+            
+            // Last insert ID (encoded integer)
+            packet[6] = 0x00;
+            
+            // Status flags
+            packet[7] = 0x02; // SERVER_STATUS_AUTOCOMMIT
+            packet[8] = 0x00;
+            
+            // Warnings
+            packet[9] = 0x00;
+            packet[10] = 0x00;
+            
+            return packet;
+        }
+
+        public byte[] CreateErrorPacket(ushort errorCode, string message)
+        {
+            var messageBytes = Encoding.UTF8.GetBytes(message ?? "Authentication failed");
+            var sqlState = Encoding.UTF8.GetBytes("28000"); // Access denied error
+            
+            // Calculate packet length: error marker (1) + error code (2) + sql state marker (1) + sql state (5) + message
+            var packetLength = 1 + 2 + 1 + 5 + messageBytes.Length;
+            var packet = new byte[4 + packetLength];
+            
+            int offset = 0;
+            
+            // Packet header
+            packet[offset++] = (byte)(packetLength & 0xFF);
+            packet[offset++] = (byte)((packetLength >> 8) & 0xFF);
+            packet[offset++] = (byte)((packetLength >> 16) & 0xFF);
+            packet[offset++] = 0x02; // Packet sequence number
+            
+            // Error marker
+            packet[offset++] = 0xFF;
+            
+            // Error code
+            packet[offset++] = (byte)(errorCode & 0xFF);
+            packet[offset++] = (byte)((errorCode >> 8) & 0xFF);
+            
+            // SQL state marker
+            packet[offset++] = 0x23; // '#'
+            
+            // SQL state
+            Array.Copy(sqlState, 0, packet, offset, 5);
+            offset += 5;
+            
+            // Error message
+            Array.Copy(messageBytes, 0, packet, offset, messageBytes.Length);
+            
+            return packet;
+        }
+
+        /// <summary>
+        /// Implements MySQL native password scrambling algorithm.
+        /// SHA1(password) XOR SHA1(salt + SHA1(SHA1(password)))
+        /// </summary>
+        private byte[] ScramblePassword(string password, byte[] salt)
+        {
+            if (string.IsNullOrEmpty(password))
+                return new byte[0];
+
+            using (var sha1 = SHA1.Create())
+            {
+                // Stage 1: SHA1(password)
+                var passwordBytes = Encoding.UTF8.GetBytes(password);
+                var stage1Hash = sha1.ComputeHash(passwordBytes);
+
+                // Stage 2: SHA1(SHA1(password))
+                var stage2Hash = sha1.ComputeHash(stage1Hash);
+
+                // Stage 3: SHA1(salt + SHA1(SHA1(password)))
+                var saltAndStage2 = new byte[salt.Length + stage2Hash.Length];
+                Array.Copy(salt, 0, saltAndStage2, 0, salt.Length);
+                Array.Copy(stage2Hash, 0, saltAndStage2, salt.Length, stage2Hash.Length);
+                var stage3Hash = sha1.ComputeHash(saltAndStage2);
+
+                // Final: SHA1(password) XOR SHA1(salt + SHA1(SHA1(password)))
+                var scramble = new byte[stage1Hash.Length];
+                for (int i = 0; i < stage1Hash.Length; i++)
+                {
+                    scramble[i] = (byte)(stage1Hash[i] ^ stage3Hash[i]);
+                }
+
+                return scramble;
+            }
+        }
+
+        private bool CompareByteArrays(byte[] array1, byte[] array2)
+        {
+            if (array1.Length != array2.Length)
+                return false;
+
+            for (int i = 0; i < array1.Length; i++)
+            {
+                if (array1[i] != array2[i])
+                    return false;
+            }
+
+            return true;
+        }
+
+        private static uint GetNextConnectionId()
+        {
+            return _nextConnectionId++;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Authentication/MySQLHandshakePacket.cs b/src/SuperSocket.MySQL/Authentication/MySQLHandshakePacket.cs
new file mode 100644
index 0000000..989909c
--- /dev/null
+++ b/src/SuperSocket.MySQL/Authentication/MySQLHandshakePacket.cs
@@ -0,0 +1,137 @@
+using System;
+using System.Buffers;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace SuperSocket.MySQL.Authentication
+{
+    /// <summary>
+    /// Represents the initial handshake packet sent by the server to the client.
+    /// Based on MySQL Protocol specification:
+    /// https://dev.mysql.com/doc/dev/mysql-server/8.0.11/page_protocol_connection_phase_packets_protocol_handshake_v10.html
+    /// </summary>
+    public class MySQLHandshakePacket
+    {
+        public byte ProtocolVersion { get; set; } = 10;
+        public string ServerVersion { get; set; } = "8.0.0-supersocket";
+        public uint ConnectionId { get; set; }
+        public byte[] AuthPluginDataPart1 { get; set; } = new byte[8];
+        public byte Filler { get; set; } = 0x00;
+        public ushort CapabilityFlagsLower { get; set; } = 0xF7FF; // Default capabilities
+        public byte CharacterSet { get; set; } = 0x21; // utf8_general_ci
+        public ushort StatusFlags { get; set; } = 0x0002; // SERVER_STATUS_AUTOCOMMIT
+        public ushort CapabilityFlagsUpper { get; set; } = 0x0000;
+        public byte AuthPluginDataLength { get; set; } = 21;
+        public byte[] Reserved { get; set; } = new byte[10];
+        public byte[] AuthPluginDataPart2 { get; set; } = new byte[12];
+        public string AuthPluginName { get; set; } = "mysql_native_password";
+
+        public MySQLHandshakePacket()
+        {
+            // Generate random salt for authentication
+            GenerateAuthPluginData();
+        }
+
+        private void GenerateAuthPluginData()
+        {
+            using (var rng = RandomNumberGenerator.Create())
+            {
+                rng.GetBytes(AuthPluginDataPart1);
+                rng.GetBytes(AuthPluginDataPart2);
+                
+                // Ensure no null bytes in the salt
+                for (int i = 0; i < AuthPluginDataPart1.Length; i++)
+                {
+                    if (AuthPluginDataPart1[i] == 0)
+                        AuthPluginDataPart1[i] = 1;
+                }
+                
+                for (int i = 0; i < AuthPluginDataPart2.Length; i++)
+                {
+                    if (AuthPluginDataPart2[i] == 0)
+                        AuthPluginDataPart2[i] = 1;
+                }
+            }
+        }
+
+        public byte[] GetFullSalt()
+        {
+            var salt = new byte[20];
+            Array.Copy(AuthPluginDataPart1, 0, salt, 0, 8);
+            Array.Copy(AuthPluginDataPart2, 0, salt, 8, 12);
+            return salt;
+        }
+
+        public byte[] ToBytes()
+        {
+            var serverVersionBytes = Encoding.UTF8.GetBytes(ServerVersion);
+            var authPluginNameBytes = Encoding.UTF8.GetBytes(AuthPluginName);
+            
+            var packetLength = 1 + serverVersionBytes.Length + 1 + 4 + 8 + 1 + 2 + 1 + 2 + 2 + 1 + 10 + 12 + 1 + authPluginNameBytes.Length + 1;
+            var packet = new byte[4 + packetLength]; // 4 bytes for packet header
+            
+            int offset = 0;
+            
+            // Packet header
+            packet[offset++] = (byte)(packetLength & 0xFF);
+            packet[offset++] = (byte)((packetLength >> 8) & 0xFF);
+            packet[offset++] = (byte)((packetLength >> 16) & 0xFF);
+            packet[offset++] = 0x00; // Packet sequence ID
+            
+            // Protocol version
+            packet[offset++] = ProtocolVersion;
+            
+            // Server version
+            Array.Copy(serverVersionBytes, 0, packet, offset, serverVersionBytes.Length);
+            offset += serverVersionBytes.Length;
+            packet[offset++] = 0x00; // Null terminator
+            
+            // Connection ID
+            packet[offset++] = (byte)(ConnectionId & 0xFF);
+            packet[offset++] = (byte)((ConnectionId >> 8) & 0xFF);
+            packet[offset++] = (byte)((ConnectionId >> 16) & 0xFF);
+            packet[offset++] = (byte)((ConnectionId >> 24) & 0xFF);
+            
+            // Auth plugin data part 1
+            Array.Copy(AuthPluginDataPart1, 0, packet, offset, 8);
+            offset += 8;
+            
+            // Filler
+            packet[offset++] = Filler;
+            
+            // Capability flags lower
+            packet[offset++] = (byte)(CapabilityFlagsLower & 0xFF);
+            packet[offset++] = (byte)((CapabilityFlagsLower >> 8) & 0xFF);
+            
+            // Character set
+            packet[offset++] = CharacterSet;
+            
+            // Status flags
+            packet[offset++] = (byte)(StatusFlags & 0xFF);
+            packet[offset++] = (byte)((StatusFlags >> 8) & 0xFF);
+            
+            // Capability flags upper
+            packet[offset++] = (byte)(CapabilityFlagsUpper & 0xFF);
+            packet[offset++] = (byte)((CapabilityFlagsUpper >> 8) & 0xFF);
+            
+            // Auth plugin data length
+            packet[offset++] = AuthPluginDataLength;
+            
+            // Reserved
+            Array.Copy(Reserved, 0, packet, offset, 10);
+            offset += 10;
+            
+            // Auth plugin data part 2
+            Array.Copy(AuthPluginDataPart2, 0, packet, offset, 12);
+            offset += 12;
+            packet[offset++] = 0x00; // Null terminator for auth plugin data
+            
+            // Auth plugin name
+            Array.Copy(authPluginNameBytes, 0, packet, offset, authPluginNameBytes.Length);
+            offset += authPluginNameBytes.Length;
+            packet[offset++] = 0x00; // Null terminator
+            
+            return packet;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponseFilter.cs b/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponseFilter.cs
new file mode 100644
index 0000000..8ac8fb2
--- /dev/null
+++ b/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponseFilter.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Buffers;
+using SuperSocket.ProtoBase;
+
+namespace SuperSocket.MySQL.Authentication
+{
+    /// <summary>
+    /// Filter for parsing MySQL handshake response packets during authentication.
+    /// </summary>
+    public class MySQLHandshakeResponseFilter : PackagePartsPipelineFilter<MySQLHandshakeResponsePacket>
+    {
+        protected override MySQLHandshakeResponsePacket CreatePackage()
+        {
+            return new MySQLHandshakeResponsePacket();
+        }
+
+        protected override IPackagePartReader<MySQLHandshakeResponsePacket> GetFirstPartReader()
+        {
+            return MySQLHandshakeResponsePartReader.PackageHeadReader;
+        }
+    }
+
+    /// <summary>
+    /// Part reader for MySQL handshake response packets.
+    /// </summary>
+    public class MySQLHandshakeResponsePartReader : IPackagePartReader<MySQLHandshakeResponsePacket>
+    {
+        public static IPackagePartReader<MySQLHandshakeResponsePacket> PackageHeadReader { get; private set; }
+
+        static MySQLHandshakeResponsePartReader()
+        {
+            PackageHeadReader = new MySQLHandshakeResponsePartReader();
+        }
+
+        public bool Process(MySQLHandshakeResponsePacket package, ref SequenceReader<byte> reader, out IPackagePartReader<MySQLHandshakeResponsePacket> nextPartReader, out bool needMoreData)
+        {
+            nextPartReader = null;
+            needMoreData = false;
+
+            try
+            {
+                var parsedPacket = MySQLHandshakeResponsePacket.ParseFromSequenceReader(ref reader);
+                
+                // Copy parsed data to the package
+                package.CapabilityFlags = parsedPacket.CapabilityFlags;
+                package.MaxPacketSize = parsedPacket.MaxPacketSize;
+                package.CharacterSet = parsedPacket.CharacterSet;
+                package.Reserved = parsedPacket.Reserved;
+                package.Username = parsedPacket.Username;
+                package.AuthResponse = parsedPacket.AuthResponse;
+                package.Database = parsedPacket.Database;
+                package.AuthPluginName = parsedPacket.AuthPluginName;
+
+                return true;
+            }
+            catch
+            {
+                needMoreData = true;
+                return false;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponsePacket.cs b/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponsePacket.cs
new file mode 100644
index 0000000..59f418b
--- /dev/null
+++ b/src/SuperSocket.MySQL/Authentication/MySQLHandshakeResponsePacket.cs
@@ -0,0 +1,170 @@
+using System;
+using System.Buffers;
+using System.Text;
+
+namespace SuperSocket.MySQL.Authentication
+{
+    /// <summary>
+    /// Represents the handshake response packet from the client.
+    /// Based on MySQL Protocol specification:
+    /// https://dev.mysql.com/doc/dev/mysql-server/8.0.11/page_protocol_connection_phase_packets_protocol_handshake_response.html
+    /// </summary>
+    public class MySQLHandshakeResponsePacket
+    {
+        public uint CapabilityFlags { get; set; }
+        public uint MaxPacketSize { get; set; }
+        public byte CharacterSet { get; set; }
+        public byte[] Reserved { get; set; } = new byte[23];
+        public string Username { get; set; } = string.Empty;
+        public byte[] AuthResponse { get; set; } = new byte[0];
+        public string Database { get; set; } = string.Empty;
+        public string AuthPluginName { get; set; } = "mysql_native_password";
+
+        public static MySQLHandshakeResponsePacket ParseFromBytes(byte[] data, int offset, int length)
+        {
+            var packet = new MySQLHandshakeResponsePacket();
+            int pos = offset + 4; // Skip packet header
+            
+            // Capability flags (4 bytes)
+            packet.CapabilityFlags = BitConverter.ToUInt32(data, pos);
+            pos += 4;
+            
+            // Max packet size (4 bytes)
+            packet.MaxPacketSize = BitConverter.ToUInt32(data, pos);
+            pos += 4;
+            
+            // Character set (1 byte)
+            packet.CharacterSet = data[pos];
+            pos += 1;
+            
+            // Reserved (23 bytes)
+            Array.Copy(data, pos, packet.Reserved, 0, 23);
+            pos += 23;
+            
+            // Username (null-terminated string)
+            int usernameStart = pos;
+            while (pos < data.Length && data[pos] != 0)
+                pos++;
+            packet.Username = Encoding.UTF8.GetString(data, usernameStart, pos - usernameStart);
+            pos++; // Skip null terminator
+            
+            // Auth response length + data
+            if (pos < data.Length)
+            {
+                byte authResponseLength = data[pos];
+                pos++;
+                
+                if (authResponseLength > 0 && pos + authResponseLength <= data.Length)
+                {
+                    packet.AuthResponse = new byte[authResponseLength];
+                    Array.Copy(data, pos, packet.AuthResponse, 0, authResponseLength);
+                    pos += authResponseLength;
+                }
+            }
+            
+            // Database name (null-terminated string) - optional
+            if (pos < data.Length)
+            {
+                int databaseStart = pos;
+                while (pos < data.Length && data[pos] != 0)
+                    pos++;
+                if (pos > databaseStart)
+                    packet.Database = Encoding.UTF8.GetString(data, databaseStart, pos - databaseStart);
+                pos++; // Skip null terminator
+            }
+            
+            // Auth plugin name (null-terminated string) - optional
+            if (pos < data.Length)
+            {
+                int pluginStart = pos;
+                while (pos < data.Length && data[pos] != 0)
+                    pos++;
+                if (pos > pluginStart)
+                    packet.AuthPluginName = Encoding.UTF8.GetString(data, pluginStart, pos - pluginStart);
+            }
+            
+            return packet;
+        }
+
+        public static MySQLHandshakeResponsePacket ParseFromSequenceReader(ref SequenceReader<byte> reader)
+        {
+            var packet = new MySQLHandshakeResponsePacket();
+            
+            // Skip packet header (already handled by pipeline)
+            
+            // Capability flags (4 bytes)
+            if (reader.Length < 4)
+                throw new InvalidOperationException("Cannot read capability flags");
+            
+            var capabilityFlags = 0u;
+            for (int i = 0; i < 4; i++)
+            {
+                if (!reader.TryRead(out byte b))
+                    throw new InvalidOperationException("Cannot read capability flags");
+                capabilityFlags |= (uint)(b << (i * 8));
+            }
+            packet.CapabilityFlags = capabilityFlags;
+            
+            // Max packet size (4 bytes)
+            if (reader.Length < 4)
+                throw new InvalidOperationException("Cannot read max packet size");
+            
+            var maxPacketSize = 0u;
+            for (int i = 0; i < 4; i++)
+            {
+                if (!reader.TryRead(out byte b))
+                    throw new InvalidOperationException("Cannot read max packet size");
+                maxPacketSize |= (uint)(b << (i * 8));
+            }
+            packet.MaxPacketSize = maxPacketSize;
+            
+            // Character set (1 byte)
+            if (!reader.TryRead(out byte characterSet))
+                throw new InvalidOperationException("Cannot read character set");
+            packet.CharacterSet = characterSet;
+            
+            // Reserved (23 bytes)
+            packet.Reserved = new byte[23];
+            for (int i = 0; i < 23; i++)
+            {
+                if (!reader.TryRead(out byte reservedByte))
+                    throw new InvalidOperationException("Cannot read reserved bytes");
+                packet.Reserved[i] = reservedByte;
+            }
+            
+            // Username (null-terminated string)
+            if (!reader.TryReadTo(out ReadOnlySequence<byte> usernameSequence, 0x00, false))
+                throw new InvalidOperationException("Cannot read username");
+            packet.Username = Encoding.UTF8.GetString(usernameSequence);
+            reader.Advance(1); // Skip null terminator
+            
+            // Auth response length + data
+            if (reader.TryRead(out byte authResponseLength) && authResponseLength > 0)
+            {
+                packet.AuthResponse = new byte[authResponseLength];
+                for (int i = 0; i < authResponseLength; i++)
+                {
+                    if (!reader.TryRead(out byte authByte))
+                        throw new InvalidOperationException("Cannot read auth response");
+                    packet.AuthResponse[i] = authByte;
+                }
+            }
+            
+            // Database name (null-terminated string) - optional
+            if (reader.TryReadTo(out ReadOnlySequence<byte> databaseSequence, 0x00, false))
+            {
+                packet.Database = Encoding.UTF8.GetString(databaseSequence);
+                reader.Advance(1); // Skip null terminator
+            }
+            
+            // Auth plugin name (null-terminated string) - optional
+            if (reader.TryReadTo(out ReadOnlySequence<byte> pluginSequence, 0x00, false))
+            {
+                packet.AuthPluginName = Encoding.UTF8.GetString(pluginSequence);
+                reader.Advance(1); // Skip null terminator
+            }
+            
+            return packet;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Authentication/MySQLSession.cs b/src/SuperSocket.MySQL/Authentication/MySQLSession.cs
new file mode 100644
index 0000000..a1443e6
--- /dev/null
+++ b/src/SuperSocket.MySQL/Authentication/MySQLSession.cs
@@ -0,0 +1,113 @@
+using System;
+using System.Threading.Tasks;
+using SuperSocket.Server;
+using SuperSocket.Channel;
+using Microsoft.Extensions.Logging;
+
+namespace SuperSocket.MySQL.Authentication
+{
+    /// <summary>
+    /// MySQL session that handles authentication before allowing query processing.
+    /// </summary>
+    public class MySQLSession : AppSession
+    {
+        private readonly MySQLAuthenticationHandler _authHandler;
+        private MySQLHandshakePacket _handshakePacket;
+        private bool _isAuthenticated = false;
+
+        public MySQLSession()
+        {
+            _authHandler = new MySQLAuthenticationHandler();
+        }
+
+        protected override async ValueTask OnSessionConnectedAsync()
+        {
+            await base.OnSessionConnectedAsync();
+            
+            // Send handshake packet immediately upon connection
+            _handshakePacket = _authHandler.CreateHandshake();
+            var handshakeBytes = _handshakePacket.ToBytes();
+            
+            await SendAsync(handshakeBytes);
+            
+            Logger?.LogInformation($"Sent handshake to connection {_handshakePacket.ConnectionId}");
+        }
+
+        public async Task<bool> HandleAuthenticationAsync(MySQLHandshakeResponsePacket response)
+        {
+            try
+            {
+                var salt = _handshakePacket?.GetFullSalt();
+                if (salt == null)
+                {
+                    Logger?.LogWarning("No handshake salt available for authentication");
+                    await SendErrorAsync(1045, "Access denied");
+                    return false;
+                }
+
+                var isValid = _authHandler.ValidateCredentials(response, salt);
+                
+                if (isValid)
+                {
+                    _isAuthenticated = true;
+                    var okPacket = _authHandler.CreateOkPacket();
+                    await SendAsync(okPacket);
+                    
+                    Logger?.LogInformation($"User '{response.Username}' authenticated successfully");
+                    return true;
+                }
+                else
+                {
+                    await SendErrorAsync(1045, "Access denied for user '" + response.Username + "'");
+                    Logger?.LogWarning($"Authentication failed for user '{response.Username}'");
+                    return false;
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger?.LogError(ex, "Error during authentication");
+                await SendErrorAsync(1045, "Authentication error");
+                return false;
+            }
+        }
+
+        public bool IsAuthenticated => _isAuthenticated;
+
+        private async Task SendErrorAsync(ushort errorCode, string message)
+        {
+            var errorPacket = _authHandler.CreateErrorPacket(errorCode, message);
+            await SendAsync(errorPacket);
+        }
+
+        private async Task SendAsync(byte[] data)
+        {
+            await Channel.SendAsync(new ReadOnlyMemory<byte>(data));
+        }
+
+        protected virtual async ValueTask OnPackageReceived(MySQLHandshakeResponsePacket package)
+        {
+            if (!IsAuthenticated)
+            {
+                // This is the authentication response
+                var success = await HandleAuthenticationAsync(package);
+                if (!success)
+                {
+                    // Authentication failed, close the connection
+                    await CloseAsync();
+                }
+            }
+            else
+            {
+                // This should be a command packet after authentication
+                // In a real implementation, you'd switch filters after authentication
+                Logger?.LogWarning("Received data after authentication - command processing not implemented");
+            }
+        }
+
+        protected override async ValueTask OnSessionClosedAsync(EventArgs e)
+        {
+            Logger?.LogInformation($"MySQL session closed");
+            await base.OnSessionClosedAsync(e);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Integration/MySQLIntegration.cs b/src/SuperSocket.MySQL/Integration/MySQLIntegration.cs
new file mode 100644
index 0000000..956153c
--- /dev/null
+++ b/src/SuperSocket.MySQL/Integration/MySQLIntegration.cs
@@ -0,0 +1,127 @@
+using System;
+using System.Threading.Tasks;
+using SuperSocket.MySQL.Authentication;
+
+namespace SuperSocket.MySQL.Integration
+{
+    /// <summary>
+    /// Simple integration example showing how to integrate MySQL authentication
+    /// with existing SuperSocket.MySQL QueryResultFilter.
+    /// </summary>
+    public class IntegratedMySQLSession : MySQLSession
+    {
+        private bool _switchedToQueryFilter = false;
+
+        protected override async ValueTask OnPackageReceived(MySQLHandshakeResponsePacket package)
+        {
+            if (!IsAuthenticated)
+            {
+                // Handle authentication
+                var success = await HandleAuthenticationAsync(package);
+                if (!success)
+                {
+                    await CloseAsync();
+                    return;
+                }
+
+                System.Console.WriteLine($"Authentication successful for user: {package.Username}");
+                
+                // After successful authentication, in a complete implementation
+                // you would switch the packet filter to handle MySQL commands
+                // For now, we'll just mark that we're ready for queries
+                _switchedToQueryFilter = true;
+                
+                System.Console.WriteLine("Ready to process MySQL queries");
+            }
+            else
+            {
+                // Post-authentication: this would be query processing
+                System.Console.WriteLine("Received query data (processing not implemented)");
+                
+                // In a real implementation, you would:
+                // 1. Parse the MySQL command packet
+                // 2. Execute the SQL query
+                // 3. Return results using QueryResult and QueryResultFilter
+                
+                // For demonstration, just send an OK packet
+                var handler = new MySQLAuthenticationHandler();
+                var okPacket = handler.CreateOkPacket();
+                await Channel.SendAsync(new ReadOnlyMemory<byte>(okPacket));
+            }
+        }
+
+        /// <summary>
+        /// This method shows how you might integrate with the existing QueryResult system
+        /// after authentication is complete.
+        /// </summary>
+        private async Task ProcessMySQLQuery(byte[] queryData)
+        {
+            try
+            {
+                // Parse the query packet (COM_QUERY or others)
+                // Execute the query using your database backend
+                // Create a QueryResult with the results
+                
+                var queryResult = new QueryResult
+                {
+                    ErrorCode = 0,
+                    ErrorMessage = null,
+                    Columns = new[] { "id", "name", "email" },
+                    Rows = new System.Collections.Generic.List<string[]>
+                    {
+                        new[] { "1", "John Doe", "john@example.com" },
+                        new[] { "2", "Jane Smith", "jane@example.com" }
+                    }
+                };
+
+                // Send the result back to the client
+                // Note: This would require implementing a QueryResult serializer
+                // that follows MySQL protocol format
+                System.Console.WriteLine($"Query result: {queryResult.Rows.Count} rows");
+            }
+            catch (Exception ex)
+            {
+                System.Console.WriteLine($"Error processing MySQL query: {ex.Message}");
+                
+                // Send error packet
+                var handler = new MySQLAuthenticationHandler();
+                var errorPacket = handler.CreateErrorPacket(1064, "Query execution error");
+                await Channel.SendAsync(new ReadOnlyMemory<byte>(errorPacket));
+            }
+        }
+    }
+
+    /// <summary>
+    /// Example showing how to create a complete MySQL server with authentication.
+    /// </summary>
+    public static class MySQLServerExample
+    {
+        public static void ShowIntegrationExample()
+        {
+            System.Console.WriteLine("=== MySQL Authentication Integration Example ===\n");
+            
+            System.Console.WriteLine("1. Authentication Flow:");
+            System.Console.WriteLine("   - Client connects to server");
+            System.Console.WriteLine("   - Server sends handshake packet with challenge");
+            System.Console.WriteLine("   - Client responds with credentials");
+            System.Console.WriteLine("   - Server validates and sends OK/ERR");
+            
+            System.Console.WriteLine("\n2. Query Processing (after authentication):");
+            System.Console.WriteLine("   - Client sends COM_QUERY packets");
+            System.Console.WriteLine("   - Server processes SQL and returns QueryResult");
+            System.Console.WriteLine("   - Results formatted according to MySQL protocol");
+            
+            System.Console.WriteLine("\n3. Integration Points:");
+            System.Console.WriteLine("   - MySQLSession handles authentication");
+            System.Console.WriteLine("   - QueryResultFilter handles query responses");
+            System.Console.WriteLine("   - Custom session bridges authentication → queries");
+            
+            System.Console.WriteLine("\n4. Example Usage:");
+            System.Console.WriteLine("   mysql -h 127.0.0.1 -u test -p");
+            System.Console.WriteLine("   Password: test");
+            System.Console.WriteLine("   mysql> SELECT * FROM users;");
+            
+            System.Console.WriteLine("\n✓ Integration example complete");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/Program.cs b/src/SuperSocket.MySQL/Program.cs
new file mode 100644
index 0000000..21d6580
--- /dev/null
+++ b/src/SuperSocket.MySQL/Program.cs
@@ -0,0 +1,21 @@
+using SuperSocket.MySQL.Tests;
+using SuperSocket.MySQL.Integration;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        System.Console.WriteLine("SuperSocket.MySQL Authentication Implementation\n");
+        
+        // Run basic authentication tests
+        AuthenticationTest.RunAllTests();
+        
+        System.Console.WriteLine("\n" + new string('=', 50) + "\n");
+        
+        // Show integration example
+        MySQLServerExample.ShowIntegrationExample();
+        
+        System.Console.WriteLine("\nPress any key to exit...");
+        System.Console.ReadKey();
+    }
+}
\ No newline at end of file
diff --git a/src/SuperSocket.MySQL/SuperSocket.MySQL.csproj b/src/SuperSocket.MySQL/SuperSocket.MySQL.csproj
index ccac898..c478ccb 100644
--- a/src/SuperSocket.MySQL/SuperSocket.MySQL.csproj
+++ b/src/SuperSocket.MySQL/SuperSocket.MySQL.csproj
@@ -1,8 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
+    <OutputType>Exe</OutputType>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="SuperSocket.ProtoBase" Version="2.0.0-*" />
+    <PackageReference Include="SuperSocket" Version="2.0.0-beta3" />
+    <PackageReference Include="SuperSocket.ProtoBase" Version="2.0.0-beta3" />
   </ItemGroup>
 </Project>
diff --git a/src/SuperSocket.MySQL/Tests/AuthenticationTest.cs b/src/SuperSocket.MySQL/Tests/AuthenticationTest.cs
new file mode 100644
index 0000000..f205436
--- /dev/null
+++ b/src/SuperSocket.MySQL/Tests/AuthenticationTest.cs
@@ -0,0 +1,95 @@
+using System;
+using System.Text;
+using SuperSocket.MySQL.Authentication;
+
+namespace SuperSocket.MySQL.Tests
+{
+    /// <summary>
+    /// Simple test to validate MySQL authentication components.
+    /// </summary>
+    public class AuthenticationTest
+    {
+        public static void TestHandshakePacket()
+        {
+            System.Console.WriteLine("Testing MySQL Handshake Packet...");
+            
+            var handshake = new MySQLHandshakePacket();
+            var handshakeBytes = handshake.ToBytes();
+            
+            System.Console.WriteLine($"Handshake packet size: {handshakeBytes.Length} bytes");
+            System.Console.WriteLine($"Connection ID: {handshake.ConnectionId}");
+            System.Console.WriteLine($"Server Version: {handshake.ServerVersion}");
+            System.Console.WriteLine($"Protocol Version: {handshake.ProtocolVersion}");
+            System.Console.WriteLine($"Salt length: {handshake.GetFullSalt().Length}");
+            
+            System.Console.WriteLine("✓ Handshake packet created successfully");
+        }
+
+        public static void TestPasswordScrambling()
+        {
+            System.Console.WriteLine("\nTesting MySQL Password Scrambling...");
+            
+            var handler = new MySQLAuthenticationHandler();
+            var handshake = handler.CreateHandshake();
+            var salt = handshake.GetFullSalt();
+            
+            // Test with valid credentials (test/test)
+            var response = new MySQLHandshakeResponsePacket
+            {
+                Username = "test",
+                AuthResponse = handler.ScramblePasswordForTest("test", salt) // We need to expose this for testing
+            };
+            
+            System.Console.WriteLine($"Username: {response.Username}");
+            System.Console.WriteLine($"Auth response length: {response.AuthResponse?.Length ?? 0}");
+            
+            System.Console.WriteLine("✓ Password scrambling test completed");
+        }
+
+        public static void TestOkErrorPackets()
+        {
+            System.Console.WriteLine("\nTesting OK and Error Packets...");
+            
+            var handler = new MySQLAuthenticationHandler();
+            
+            var okPacket = handler.CreateOkPacket();
+            System.Console.WriteLine($"OK packet size: {okPacket.Length} bytes");
+            
+            var errorPacket = handler.CreateErrorPacket(1045, "Access denied");
+            System.Console.WriteLine($"Error packet size: {errorPacket.Length} bytes");
+            
+            System.Console.WriteLine("✓ OK and Error packets created successfully");
+        }
+
+        public static void RunAllTests()
+        {
+            System.Console.WriteLine("=== MySQL Authentication Component Tests ===\n");
+            
+            try
+            {
+                TestHandshakePacket();
+                TestPasswordScrambling();
+                TestOkErrorPackets();
+                
+                System.Console.WriteLine("\n✅ All tests passed!");
+            }
+            catch (Exception ex)
+            {
+                System.Console.WriteLine($"\n❌ Test failed: {ex.Message}");
+                System.Console.WriteLine(ex.StackTrace);
+            }
+        }
+    }
+}
+
+// Extension to expose ScramblePassword for testing
+namespace SuperSocket.MySQL.Authentication
+{
+    public partial class MySQLAuthenticationHandler
+    {
+        public byte[] ScramblePasswordForTest(string password, byte[] salt)
+        {
+            return ScramblePassword(password, salt);
+        }
+    }
+}
\ No newline at end of file