Function lkc_handshake_p2

pub fn lkc_handshake_p2<A>(
    my_phase0: impl Point,
    server_reply: impl Point,
    id: &LkIdentity,
    max_diff_sec: usize,
    into: impl FnOnce(PointParts<'_>) -> A,
) -> Result<(A, PubKey)>