Source file `griffin.ml`

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module Stubs = struct
  type ctxt

  external allocate_ctxt :
    int -> int -> Bls12_381.Fr.t array -> Bls12_381.Fr.t array -> ctxt
    = "caml_bls12_381_hash_griffin_allocate_ctxt_stubs"

  external apply_perm : ctxt -> unit
    = "caml_bls12_381_hash_griffin_apply_permutation_stubs"

  external get_state : Bls12_381.Fr.t array -> ctxt -> unit
    = "caml_bls12_381_hash_griffin_get_state_stubs"

  external set_state : ctxt -> Bls12_381.Fr.t array -> unit
    = "caml_bls12_381_hash_griffin_set_state_stubs"

  external get_state_size : ctxt -> int
    = "caml_bls12_381_hash_griffin_get_state_size_stubs"
end

type ctxt = Stubs.ctxt

let allocate_ctxt nb_rounds state_size constants alpha_beta_s =
  if state_size <> 3 && state_size <> 4 then
    failwith "Only state of 3 and 4 are implemented for the moment" ;
  let ctxt = Stubs.allocate_ctxt nb_rounds state_size constants alpha_beta_s in
  ctxt

let apply_permutation ctxt = Stubs.apply_perm ctxt

let get_state_size ctxt = Stubs.get_state_size ctxt

let set_state ctxt state =
  let exp_state_size = Stubs.get_state_size ctxt in
  let state_size = Array.length state in
  if state_size <> exp_state_size then
    failwith
      (Printf.sprintf
         "The given array contains %d elements but the expected state size is \
          %d"
         state_size
         exp_state_size) ;
  Stubs.set_state ctxt state

let get_state ctxt =
  let state_size = Stubs.get_state_size ctxt in
  let state = Array.init state_size (fun _ -> Bls12_381.Fr.(copy zero)) in
  Stubs.get_state state ctxt ;
  state

module Parameters = struct
  let state_size_3 =
    ( 12,
      3,
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        |],
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        |] )

  let state_size_4 =
    ( 11,
      4,
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        |],
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             "17813784892290133059542601841503491969755708846824405324169253766465967270998"
        |] )
end