let () =
  let id s = s |> B32.encode |> B32.decode |> Result.get_ok in
  let round_trip s =
    let s' = id s in
    match s' = s with
    | false ->
        Fmt.failwith "b32 round trip failure: @\nin :`%S`@\nout:`%S`" s' s
    | true -> ()
  in
  let s = String.init 0xff Char.chr in
  round_trip s;
  let s_l = List.init 0x0f (fun i -> String.init i Char.chr) in
  List.iter round_trip s_l; ()

let () =
  let input = "91JPRV3F5GG4EKJNDSJQ8" in
  Fmt.epr "input length: %d@." (String.length input);
  let output =
    input
    |> Hash.H64.of_b32
    |> Result.get_ok
    |> Hash.H64.to_octets
    |> B32.encode
  in
  let expected =
    "D0R24RZ1TPASVQ2NY56CT8AJDYZE9ZGDB0GVZ05E9D4YGZQW2RC5YFPQ0Q86EPW836DY7VYQTNFFJT3ZR2K508F4JVS5JNJKYN2MMFR"
  in
  Fmt.pr "input   : %s@." input;
  Fmt.pr "output  : %s@." output;
  Fmt.pr "expected: %s@." expected;

  ()