58 lines
1.6 KiB
OCaml
58 lines
1.6 KiB
OCaml
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open Mirage_crypto_rng
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module Urandom = Urandom
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module Getentropy = Getentropy
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let use_dev_urandom () =
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let g = create (module Urandom) in
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set_default_generator g
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let use_getentropy () =
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let g = create (module Getentropy) in
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set_default_generator g
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let use_default () = use_getentropy ()
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let src = Logs.Src.create "mirage-crypto-rng.unix" ~doc:"Mirage crypto RNG Unix"
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module Log = (val Logs.src_log src : Logs.LOG)
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external getrandom_buf : bytes -> int -> int -> unit = "mc_getrandom" [@@noalloc]
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let getrandom_into buf ~off ~len =
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getrandom_buf buf off len
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let getrandom size =
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let buf = Bytes.create size in
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getrandom_into buf ~off:0 ~len:size;
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Bytes.unsafe_to_string buf
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let getrandom_init i =
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let data = getrandom 128 in
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Entropy.header i data
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let running = Atomic.make false
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let initialize (type a) ?g (rng : a generator) =
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if Atomic.get running then
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Log.debug
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(fun m -> m "Mirage_crypto_rng_unix.initialize has already been called, \
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ignoring this call.")
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else begin
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(try
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let _ = default_generator () in
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Log.warn (fun m -> m "Mirage_crypto_rng.default_generator has already \
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been set, check that this call is intentional");
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with
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No_default_generator -> ());
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Atomic.set running true ;
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let seed =
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let init =
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Entropy.[ bootstrap ; whirlwind_bootstrap ; bootstrap ; getrandom_init ]
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in
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List.mapi (fun i f -> f i) init |> String.concat ""
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in
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let _ = Entropy.register_source "getrandom" in
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set_default_generator (create ?g ~seed rng)
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end
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