69 lines
3.0 KiB
OCaml
69 lines
3.0 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License, with *)
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(* the special exception on linking described in file ../LICENSE. *)
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(* *)
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(***********************************************************************)
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(** MD5 message digest.
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This module provides functions to compute 128-bit 'digests' of
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arbitrary-length strings or files. The digests are of cryptographic
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quality: it is very hard, given a digest, to forge a string having
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that digest. The algorithm used is MD5. This module should not be
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used for secure and sensitive cryptographic applications. For these
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kind of applications more recent and stronger cryptographic
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primitives should be used instead.
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*)
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type t = string
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(** The type of digests: 16-character strings. *)
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val compare : t -> t -> int
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(** The comparison function for 16-character digest, with the same
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specification as {!Pervasives.compare} and the implementation
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shared with {!String.compare}. Along with the type [t], this
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function [compare] allows the module [Digest] to be passed as
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argument to the functors {!Set.Make} and {!Map.Make}.
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@since 4.00.0 *)
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val string : string -> t
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(** Return the digest of the given string. *)
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val substring : string -> int -> int -> t
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(** [Digest.substring s ofs len] returns the digest of the substring
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of [s] starting at character number [ofs] and containing [len]
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characters. *)
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external channel : in_channel -> int -> t = "caml_md5_chan"
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(** If [len] is nonnegative, [Digest.channel ic len] reads [len]
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characters from channel [ic] and returns their digest, or raises
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[End_of_file] if end-of-file is reached before [len] characters
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are read. If [len] is negative, [Digest.channel ic len] reads
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all characters from [ic] until end-of-file is reached and return
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their digest. *)
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val file : string -> t
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(** Return the digest of the file whose name is given. *)
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val output : out_channel -> t -> unit
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(** Write a digest on the given output channel. *)
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val input : in_channel -> t
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(** Read a digest from the given input channel. *)
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val to_hex : t -> string
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(** Return the printable hexadecimal representation of the given digest. *)
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val from_hex : string -> t
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(** Convert a hexadecimal representation back into the corresponding digest.
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Raise [Invalid_argument] if the argument is not exactly 32 hexadecimal
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characters.
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@since 4.00.0 *)
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