BatDigest.S
val string : string -> t
val bytes : bytes -> t
val substring : string -> int -> int -> t
val subbytes : bytes -> int -> int -> t
val channel : Stdlib.in_channel -> int -> t
val file : string -> t
val output : Stdlib.out_channel -> t -> unit
val input : Stdlib.in_channel -> t
val to_hex : t -> string
val of_hex : string -> t