Revision 2314ff8aef4492aee55f65330d4dc15ed1d5c1f6 authored by Pietro on 23 April 2020, 10:46:43 UTC, committed by Romain on 11 May 2020, 14:42:04 UTC
1 parent 32818f5
pbkdf.ml
(* Copyright (c) 2016, Alfredo Beaumont, Sonia Meruelo All rights reserved. *)
(* Distributed under the BSD2 license, see terms at the end of the file. *)
let xorbuf a b =
let alen = Bigstring.length a in
if Bigstring.length b <> alen then
invalid_arg "xor: both buffers must be of same size" ;
for i = 0 to alen - 1 do
Bigstring.(set a i Char.(chr (code (get a i) lxor code (get b i))))
done ;
a
let cdiv x y =
(* This is lifted from Nocrypto.Uncommon.(//)
(formerly known as [cdiv]). It is part of the documented, publicly
exposed _internal_ utility library not for public consumption, hence
the API break that prompted this copy-pasted function. *)
if y < 1 then raise Division_by_zero
else if x > 0 then 1 + ((x - 1) / y)
else 0
[@@inline]
module type S = sig
val pbkdf2 :
password:Bigstring.t ->
salt:Bigstring.t ->
count:int ->
dk_len:int32 ->
Bigstring.t
end
module Make (H : Hacl.Hash.S) : S = struct
let pbkdf2 ~password ~salt ~count ~dk_len =
if count <= 0 then invalid_arg "count must be a positive integer" ;
if dk_len <= 0l then
invalid_arg "derived key length must be a positive integer" ;
let h_len = H.bytes and dk_len = Int32.to_int dk_len in
let l = cdiv dk_len h_len in
let r = dk_len - ((l - 1) * h_len) in
let block i =
let rec f u xor = function
| 0 ->
xor
| j ->
let u = H.HMAC.digest ~key:password ~msg:u in
f u (xorbuf xor u) (j - 1)
in
let int_i = Bigstring.create 4 in
EndianBigstring.BigEndian.set_int32 int_i 0 (Int32.of_int i) ;
let u_1 =
H.HMAC.digest ~key:password ~msg:(Bigstring.concat "" [salt; int_i])
in
f u_1 u_1 (count - 1)
in
let rec loop blocks = function
| 0 ->
blocks
| i ->
loop (block i :: blocks) (i - 1)
in
Bigstring.concat "" (loop [Bigstring.sub (block l) 0 r] (l - 1))
end
module SHA256 = Make (Hacl.Hash.SHA256)
module SHA512 = Make (Hacl.Hash.SHA512)
(* Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *)
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