1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
open Mirage_crypto_rng
module Urandom = Urandom
module Getentropy = Getentropy
let use_dev_urandom () =
let g = create (module Urandom) in
set_default_generator g
let use_getentropy () =
let g = create (module Getentropy) in
set_default_generator g
let use_default () = use_getentropy ()
let src = Logs.Src.create "mirage-crypto-rng.unix" ~doc:"Mirage crypto RNG Unix"
module Log = (val Logs.src_log src : Logs.LOG)
external getrandom_buf : bytes -> int -> int -> unit = "mc_getrandom" [@@noalloc]
let getrandom_into buf ~off ~len =
getrandom_buf buf off len
let getrandom size =
let buf = Bytes.create size in
getrandom_into buf ~off:0 ~len:size;
Bytes.unsafe_to_string buf
let getrandom_init i =
let data = getrandom 128 in
Entropy.header i data
let running = Atomic.make false
let initialize (type a) ?g (rng : a generator) =
if Atomic.get running then
Log.debug
(fun m -> m "Mirage_crypto_rng_unix.initialize has already been called, \
ignoring this call.")
else begin
(try
let _ = default_generator () in
Log.warn (fun m -> m "Mirage_crypto_rng.default_generator has already \
been set, check that this call is intentional");
with
No_default_generator -> ());
Atomic.set running true ;
let seed =
let init =
Entropy.[ bootstrap ; whirlwind_bootstrap ; bootstrap ; getrandom_init ]
in
List.mapi (fun i f -> f i) init |> String.concat ""
in
let _ = Entropy.register_source "getrandom" in
set_default_generator (create ?g ~seed rng)
end
|
