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Re:TunSafe: A High Performance WireGuard Client for Windows by nostream on Sunday March 04, 2018 @05:02PM (#16517043)
zx2c4: Which language is the linux version of wireguard written in?
Re:TunSafe: A High Performance WireGuard Client for Windows by rumpelsepp on Sunday March 11, 2018 @04:44AM (#16562229)
the reference implementation is a linux kernel module: https://git.zx2c4.com/WireGuard/

there are currently at least two actively developped open source userspace implementations in different languages. Two examples are Go and Rust:

https://git.zx2c4.com/wireguard-go/ https://git.zx2c4.com/wireguard-rs/