sig
type t = string
val string : string -> Digest.t
val substring : string -> pos:int -> len:int -> Digest.t
external channel : Pervasives.in_channel -> len:int -> Digest.t
= "md5_chan"
val file : string -> Digest.t
val output : Pervasives.out_channel -> Digest.t -> unit
val input : Pervasives.in_channel -> Digest.t
end