tailscale/sspi

The sspi project provides a way for programs written in the Go language to tap into a built-in Windows security system called the Security Support Provider Interface, or SSPI. In plain terms, it lets Go applications running on Windows handle authentication tasks like verifying user identities or establishing secure, encrypted connections without having to build those security features from scratch. SSPI is a core part of how Windows handles authentication behind the scenes. When you log into a corporate network or connect to a secure service that uses Windows-based credentials, SSPI is doing the work of proving who you are and keeping the connection safe. This repository wraps that Windows functionality so that developers building Go applications can call on it directly, letting the operating system manage the heavy lifting of security protocols. The main audience is developers building Go applications that need to run on Windows and interact with enterprise authentication systems. For example, if a company is building an internal tool that needs to securely talk to a Windows server using the same credentials a logged-in employee already has, this package lets the tool do that. It bridges the gap between Go and Windows-native security, which matters in corporate environments where Windows authentication is the standard. The README is very brief and does not go into detail about specific features, supported authentication protocols, or how to get started. From what is provided, it is simply described as a set of Go packages for accessing the Windows security interface, with no additional context on tradeoffs or project architecture.