networking.wg-quick.interfaces.<name>.peers.*.presharedKey

Base64 preshared key generated by wg genpsk. Optional, and may be omitted. This option adds an additional layer of symmetric-key cryptography to be mixed into the already existing public-key cryptography, for post-quantum resistance.

Warning: Consider using presharedKeyFile instead if you do not want to store the key in the world-readable Nix store.