Generate Random `int`, `float`, and `char` using mirage-crypto-rng
Task
Random Values / Generate Random `int`, `float`, and `char`
Opam Packages Used
- mirage-crypto-rng Tested with version: 0.11.3 — Used libraries: mirage-crypto-rng.unix
- cstruct Tested with version: 6.2.0 — Used libraries: cstruct
- randomconv Tested with version: 0.1.3 — Used libraries: randomconv
Code
Initialize the Mirage_crypto_rng with the an entropy source.
let () =
Mirage_crypto_rng_unix.initialize
(module Mirage_crypto_rng.Fortuna)
Random bytes generation function.
let generator n =
n
|> Mirage_crypto_rng.generate
|> Cstruct.to_string
Generate int8, int16, int32 or int64 values.
let int8 () = Randomconv.int8 generator
let int16 () = Randomconv.int16 generator
let int32 () = Randomconv.int32 generator
let int64 () = Randomconv.int64 generator
Generate a random int or float values strictly lower than bound.
let int ?bound () =
Randomconv.int ?bound generator
let float ?bound () =
Randomconv.float ?bound generator
Generate char values
let char () = () |> int8 |> Char.chr
let digit () = 48 + int ~bound:10 () |> Char.chr
let majuscule () = 65 + int ~bound:26 () |> Char.chr
let minuscule () = 97 + int ~bound:26 () |> Char.chr
let letter () =
let n = int ~bound:52 () in
Char.chr @@ n + if n < 26 then 65 else 71
let alphanum () =
let n = int ~bound:62 () in
Char.chr @@ n
+ if n < 10 then 48 else if n < 36 then 55 else 61
Random bytes into byte arrays or big arrays.
let bytes n =
n
|> Mirage_crypto_rng.generate
|> Cstruct.to_bytes
let bigarray n =
n
|> Mirage_crypto_rng.generate
|> Cstruct.to_bigarray
let list n gen = List.init n (fun _ -> gen ())