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(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License, with *)
(* the special exception on linking described in file ../LICENSE. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(** MD5 message digest.
This module provides functions to compute 128-bit ``digests'' of
arbitrary-length strings or files. The digests are of cryptographic
quality: it is very hard, given a digest, to forge a string having
that digest. The algorithm used is MD5.
*)
type t = string
(** The type of digests: 16-character strings. *)
val string : string -> t
(** Return the digest of the given string. *)
val substring : string -> int -> int -> t
(** [Digest.substring s ofs len] returns the digest of the substring
of [s] starting at character number [ofs] and containing [len]
characters. *)
external channel : in_channel -> int -> t = "caml_md5_chan"
(** If [len] is nonnegative, [Digest.channel ic len] reads [len]
characters from channel [ic] and returns their digest, or raises
[End_of_file] if end-of-file is reached before [len] characters
are read. If [len] is negative, [Digest.channel ic len] reads
all characters from [ic] until end-of-file is reached and return
their digest. *)
val file : string -> t
(** Return the digest of the file whose name is given. *)
val output : out_channel -> t -> unit
(** Write a digest on the given output channel. *)
val input : in_channel -> t
(** Read a digest from the given input channel. *)
val to_hex : t -> string
(** Return the printable hexadecimal representation of the given digest. *)
|
