TwSsh 1.2.8

TWSSH - High-Performance SSH Library for .NET

TWSSH is a modern, high-performance SSH library for .NET applications. It provides comprehensive SSH2 protocol support including command execution, SFTP, SCP, port forwarding, and interactive shells.

Features

• SSH2 Protocol Support - Full implementation of SSH2 protocol
• Multiple Authentication Methods - Password, public key, keyboard-interactive
• SFTP Support - Secure file transfer protocol
• SCP Support - Secure copy protocol
• Port Forwarding - Local and remote port forwarding
• Interactive Shell - Full PTY support for interactive sessions
• Modern Cryptography - ChaCha20-Poly1305, AES-GCM, Ed25519, ECDSA
• Cross-Platform - Works on Windows, Linux, and macOS
• High Performance - Optimized for low latency and high throughput
• Async/Await - Full async support with ValueTask

Supported Frameworks

• .NET 8.0
• .NET 6.0
• .NET Standard 2.1

Installation

dotnet add package TwSsh

Quick Start

using TwSsh.Client;
using TwSsh.Licensing;

// Initialize license (required)
LicenseManager.Instance.Initialize("YOUR-LICENSE-KEY");

// Or use trial mode for 30-day evaluation
// LicenseManager.Instance.InitializeTrial();

// Connect and run a command
var settings = new SshClientSettings
{
    Host = "example.com",
    Port = 22,
    Credential = new PasswordCredential("username", "password")
};

await using var client = new SshClient(settings);
await client.ConnectAndAuthenticateAsync();

var result = await client.RunCommandAsync("uname -a");
Console.WriteLine(result.Output);

Licensing & Pricing

TWSSH is commercial software. A valid license is required for production use.

License Tiers

Feature Comparison

Obtaining a License

Contact us at sales@twssh.io to purchase a license.

License Activation

// Option 1: Initialize with license key
LicenseManager.Instance.Initialize("YOUR-LICENSE-KEY");

// Option 2: Use license file
LicenseManager.Instance.InitializeFromFile("path/to/license.lic");

// Option 3: Auto-discovery (place twssh.lic in app directory)
// The library automatically finds and loads it

// Option 4: Trial mode for evaluation
LicenseManager.Instance.InitializeTrial(30); // 30-day trial

Documentation

Full documentation is available at https://twssh.io/docs

Support

• Email: support@twssh.io
• Enterprise Support: Priority response (4hr SLA) for Enterprise licenses

Security

TWSSH implements modern security best practices:

• No deprecated algorithms (no MD5, SHA1, DES, 3DES)
• Support for latest key exchange algorithms
• Secure memory handling for credentials
• Regular security updates

Changelog

v1.2.6

• Performance improvements for large file transfers
• Enhanced connection stability under high load
• Fixed edge case in keyboard-interactive authentication
• Updated documentation and examples

v1.2.0

• Added connection pooling for Enterprise licenses
• Improved SFTP resume capabilities
• Enhanced error messages and logging
• Performance optimizations for multi-channel scenarios

v1.1.0

• Added keyboard-interactive authentication support
• ChaCha20-Poly1305 cipher implementation
• Improved PTY resize handling
• Bug fixes for remote port forwarding

v1.0.0

• Initial release
• SSH2 protocol support
• Password and public key authentication
• Command execution and shell support
• SFTP and SCP file transfer
• Port forwarding (local and remote)
• Modern cryptographic algorithms
• Commercial licensing system

Copyright 2025 TWSSH. All rights reserved.