69 lines
2.2 KiB
OCaml
69 lines
2.2 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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(* $Id$ *)
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(* Message digest (MD5) *)
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type t = string
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let compare = String.compare
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external unsafe_string: string -> int -> int -> t = "caml_md5_string"
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external channel: in_channel -> int -> t = "caml_md5_chan"
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let string str =
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unsafe_string str 0 (String.length str)
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let substring str ofs len =
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if ofs < 0 || len < 0 || ofs > String.length str - len
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then invalid_arg "Digest.substring"
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else unsafe_string str ofs len
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let file filename =
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let ic = open_in_bin filename in
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let d = channel ic (-1) in
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close_in ic;
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d
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let output chan digest =
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output chan digest 0 16
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let input chan =
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let digest = String.create 16 in
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really_input chan digest 0 16;
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digest
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let to_hex d =
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let result = String.create 32 in
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for i = 0 to 15 do
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String.blit (Printf.sprintf "%02x" (int_of_char d.[i])) 0 result (2*i) 2;
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done;
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result
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let from_hex s =
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if String.length s <> 32 then raise (Invalid_argument "Digest.from_hex");
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let digit c =
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match c with
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| '0'..'9' -> Char.code c - Char.code '0'
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| 'A'..'F' -> Char.code c - Char.code 'A' + 10
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| 'a'..'f' -> Char.code c - Char.code 'a' + 10
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| _ -> raise (Invalid_argument "Digest.from_hex")
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in
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let byte i = digit s.[i] lsl 4 + digit s.[i+1] in
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let result = String.create 16 in
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for i = 0 to 15 do
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result.[i] <- Char.chr (byte (2 * i));
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done;
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result
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