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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 Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
(* Message digest (MD5) *)
type t = string
let compare = String.compare
let equal = String.equal
external unsafe_string: string -> int -> int -> t = "caml_md5_string"
external channel: in_channel -> int -> t = "caml_md5_chan"
let string str =
unsafe_string str 0 (String.length str)
let bytes b = string (Bytes.unsafe_to_string b)
let substring str ofs len =
if ofs < 0 || len < 0 || ofs > String.length str - len
then invalid_arg "Digest.substring"
else unsafe_string str ofs len
let subbytes b ofs len = substring (Bytes.unsafe_to_string b) ofs len
let file filename =
let ic = open_in_bin filename in
match channel ic (-1) with
| d -> close_in ic; d
| exception e -> close_in ic; raise e
let output chan digest =
output_string chan digest
let input chan = really_input_string chan 16
let char_hex n =
Char.unsafe_chr (n + if n < 10 then Char.code '0' else (Char.code 'a' - 10))
let to_hex d =
let result = Bytes.create 32 in
for i = 0 to 15 do
let x = Char.code d.[i] in
Bytes.unsafe_set result (i*2) (char_hex (x lsr 4));
Bytes.unsafe_set result (i*2+1) (char_hex (x land 0x0f));
done;
Bytes.unsafe_to_string result
let from_hex s =
if String.length s <> 32 then raise (Invalid_argument "Digest.from_hex");
let digit c =
match c with
| '0'..'9' -> Char.code c - Char.code '0'
| 'A'..'F' -> Char.code c - Char.code 'A' + 10
| 'a'..'f' -> Char.code c - Char.code 'a' + 10
| _ -> raise (Invalid_argument "Digest.from_hex")
in
let byte i = digit s.[i] lsl 4 + digit s.[i+1] in
let result = Bytes.create 16 in
for i = 0 to 15 do
Bytes.set result i (Char.chr (byte (2 * i)));
done;
Bytes.unsafe_to_string result
|
