rand.ml
(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
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(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
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(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
let generate len = Bigstring.to_bytes (Hacl.Rand.gen len)
let generate_into ?(pos = 0) ?len buf =
let buflen = Bytes.length buf in
let len = match len with Some len -> len | None -> buflen - pos in
if pos < 0 || len < 0 || pos + len > buflen then
invalid_arg
(Printf.sprintf
"Rand.generate_into: invalid slice (pos=%d len=%d)"
pos
len) ;
let rand = Hacl.Rand.gen len in
Bigstring.blit_to_bytes rand 0 buf pos len