http://astrillrcpusdryujyzbsl7wsugvyfc5s6veyrpkojiqbrorgkfdxvid.onion/features/vpn-protocols/wireguard
Its current codebase is under 4,000 lines of code. Compared to its alternative predecessors like Swan/IPsec (400,000+ lines) or OpenVPN/OpenSSL (600,000+ lines), in which auditing the gigantic codebases is an overwhelming task even for large teams of security experts, Wireguard supercedes all of them.