val reqs : AutoConfig2.feature list
val encrypt : C.buf -> C.buf -> Unsigned.uint32 -> C.buf -> Unsigned.uint32 -> C.buf -> C.buf -> C.buf -> unit
val decrypt : C.buf -> C.buf -> Unsigned.uint32 -> C.buf -> Unsigned.uint32 -> C.buf -> C.buf -> C.buf -> Unsigned.uint32