about keypair_update

[Cjyoleon]

No description provided.

[inorick]

I think the keypair_update function rotates the keys (prev <- curr <- next) if the next key pair has been acknowledged, i.e. if key_is_next in line 454 is true:

wireguard-lwip/src/wireguard.c

Line 454 in 0c44df3

bool key_is_next = (received_keypair == &peer->next_keypair);

So the rotation looks good to me:

1. Overwrite prev with curr.
2. Overwrite curr with next.
3. Destroy next as it has been rotated to curr.