(***********************************************************************)
(*                                                                     *)
(*                                OCaml                                *)
(*                                                                     *)
               , 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.     *)
(*                                                                     *)
(***********************************************************************)

  $ I d : digest.ml 12082 2012 - 01 - 26 22:56:48Z doligez $

(* Message digest (MD5) *)

type t = string

let compare = String.compare

external unsafe_string: string -> int -> int -> t = "caml_md5_string_r" "reentrant"
external channel: in_channel -> int -> t = "caml_md5_chan"

let string str =
  unsafe_string str 0 (String.length str)

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 file filename =
  let ic = open_in_bin filename in
  let d = channel ic (-1) in
  close_in ic;
  d

let output chan digest =
  output chan digest 0 16

let input chan =
  let digest = String.create 16 in
  really_input chan digest 0 16;
  digest

let to_hex d =
  let result = String.create 32 in
  for i = 0 to 15 do
    String.blit (Printf.sprintf "%02x" (int_of_char d.[i])) 0 result (2*i) 2;
  done;
  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 = String.create 16 in
  for i = 0 to 15 do
    result.[i] <- Char.chr (byte (2 * i));
  done;
  result

*********************************************************************
                                                                     
                                OCaml                                
                                                                     
                                                                     
  the special exception on linking described in file ../LICENSE.     
                                                                     
*********************************************************************
 Message digest (MD5) 
               , 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    

  $ I d : digest.ml 12082 2012 - 01 - 26 22:56:48Z doligez $


type t = string

let compare = String.compare

external unsafe_string: string -> int -> int -> t = "caml_md5_string_r" "reentrant"
external channel: in_channel -> int -> t = "caml_md5_chan"

let string str =
  unsafe_string str 0 (String.length str)

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 file filename =
  let ic = open_in_bin filename in
  let d = channel ic (-1) in
  close_in ic;
  d

let output chan digest =
  output chan digest 0 16

let input chan =
  let digest = String.create 16 in
  really_input chan digest 0 16;
  digest

let to_hex d =
  let result = String.create 32 in
  for i = 0 to 15 do
    String.blit (Printf.sprintf "%02x" (int_of_char d.[i])) 0 result (2*i) 2;
  done;
  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 = String.create 16 in
  for i = 0 to 15 do
    result.[i] <- Char.chr (byte (2 * i));
  done;
  result
