77 lines
2.8 KiB
OCaml
77 lines
2.8 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. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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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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let equal = String.equal
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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 bytes b = string (Bytes.unsafe_to_string b)
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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 subbytes b ofs len = substring (Bytes.unsafe_to_string b) ofs len
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let file filename =
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let ic = open_in_bin filename in
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match channel ic (-1) with
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| d -> close_in ic; d
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| exception e -> close_in ic; raise e
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let output chan digest =
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output_string chan digest
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let input chan = really_input_string chan 16
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let char_hex n =
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Char.unsafe_chr (n + if n < 10 then Char.code '0' else (Char.code 'a' - 10))
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let to_hex d =
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if String.length d <> 16 then invalid_arg "Digest.to_hex";
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let result = Bytes.create 32 in
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for i = 0 to 15 do
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let x = Char.code d.[i] in
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Bytes.unsafe_set result (i*2) (char_hex (x lsr 4));
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Bytes.unsafe_set result (i*2+1) (char_hex (x land 0x0f));
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done;
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Bytes.unsafe_to_string result
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let from_hex s =
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if String.length s <> 32 then invalid_arg "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 = Bytes.create 16 in
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for i = 0 to 15 do
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Bytes.set result i (Char.chr (byte (2 * i)));
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done;
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Bytes.unsafe_to_string result
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