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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. *)
(* *)
(***********************************************************************)
(** 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. This module should not be
used for secure and sensitive cryptographic applications. For these
kind of applications more recent and stronger cryptographic
primitives should be used instead.
*)
type t = string
(** The type of digests: 16-character strings. *)
val compare : t -> t -> int
(** The comparison function for 16-character digest, with the same
specification as {!Pervasives.compare} and the implementation
shared with {!String.compare}. Along with the type [t], this
function [compare] allows the module [Digest] to be passed as
argument to the functors {!Set.Make} and {!Map.Make}.
@since 4.00.0 *)
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. *)
val from_hex : string -> t
(** Convert a hexadecimal representation back into the corresponding digest.
Raise [Invalid_argument] if the argument is not exactly 32 hexadecimal
characters.
@since 4.00.0 *)
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