Our sans-IO WireGuard implementation in Rust, optimized for ease of use, security and performance through a parallel-friendly and idiomatic API. Today, we are announcing sanstun: a sans-IO Rust implementation of the WireGuard® state machine, optimized for ease of use, security and performance through a parallel-friendly and idiomatic API. sans-IO is the idea that you design your system such that IO and side-effects are cleanly separated from the state and "business logic".