WireGuard seems to use symmetric key crypto for packet encdec. The card would need to sign only the handshake, which occurs "every few minutes"[1] and "is done

WireGuard seems to use symmetric key crypto for packet encdec. The card would need to sign only the handshake, which occurs "every few minutes"[1] and "is done based on time, and not based on the contents of prior packets"[1]. 1: https://www.wireguard.com/protocol/ https://www.wireguard.com/protocol/