val secret_to_public : C.buf -> C.buf -> unitval sign : C.buf -> C.buf -> Unsigned.uint32 -> C.buf -> unitval verify : C.buf -> Unsigned.uint32 -> C.buf -> C.buf -> boolval expand_keys : C.buf -> C.buf -> unitval sign_expanded : C.buf -> C.buf -> Unsigned.uint32 -> C.buf -> unit