package class_group_vdf

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Verifiable Delay Functions bindings to Chia's VDF

Install 

dune-project
 Dependency

gitlab.com Readme Edit opam file Versions (5)

Authors

  1. N
    Nomadic Labs <contact@nomadic-labs.com>

Maintainers

  1. N
    Nomadic Labs <contact@nomadic-labs.com>

Sources

ocaml-chia-vdf-v0.0.4.tar.gz
md5=9dedb6584bf23877136c328703d47532
sha512=265f4c76fe995524260bff055347a9bb40cce9b5adf0f0222fd71a0cce29d51fe1fbac7b961577b6d28e16c8aa4630805c6365924e6fc0d06c4d07c84d2c6c78

doc/src/class_group_vdf/vdf.ml.html

Source file vdf.ml

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module type Vdf_sig = sig
  module Group : S.GROUP

  (** [prove_vdf discriminant form difficulty] *)
  val prove : Group.t -> Unsigned.UInt64.t -> Group.t * Group.t

  (** [verify_vdf discriminant form difficulty form form] *)
  val verify : Group.t -> Unsigned.UInt64.t -> Group.t -> Group.t -> bool
end

module Stubs = struct
  external prove :
    Bytes.t ->
    Unsigned.Size_t.t ->
    Bytes.t ->
    Unsigned.UInt64.t ->
    Bytes.t ->
    Bytes.t ->
    int = "caml_prove_bytecode_stubs" "caml_prove_stubs"

  external verify :
    Bytes.t ->
    Unsigned.Size_t.t ->
    Bytes.t ->
    Bytes.t ->
    Bytes.t ->
    Unsigned.UInt64.t ->
    int = "caml_verify_bytecode_stubs" "caml_verify_stubs"
end

module Make (CG : Class_group.Class_group_sig) : Vdf_sig = struct
  module Group = CG

  let discriminant_bytes = Utils.Integer.to_bytes CG.discriminant

  let prove challenge difficulty =
    let challenge_bytes = CG.to_bytes challenge in
    let result_bytes = Bytes.create CG.size_in_bytes in
    let proof_bytes = Bytes.create CG.size_in_bytes in
    let status =
      Stubs.prove
        discriminant_bytes
        CG.discriminant_size
        challenge_bytes
        difficulty
        result_bytes
        proof_bytes
    in
    let result = CG.of_bytes_exn result_bytes in
    let proof = CG.of_bytes_exn proof_bytes in
    match status with
    | x when x = 0 -> (result, proof)
    | x when x = 2 -> raise Utils.invalid_group_element
    | _ -> raise Utils.unknown_error

  let verify challenge difficulty result proof =
    let challenge_bytes = CG.to_bytes challenge in
    let result_bytes = CG.to_bytes result in
    let proof_bytes = CG.to_bytes proof in
    let status =
      Stubs.verify
        discriminant_bytes
        CG.discriminant_size
        challenge_bytes
        result_bytes
        proof_bytes
        difficulty
    in
    match status with
    | x when x = 0 -> false
    | x when x = 1 -> true
    | x when x = 2 -> raise Utils.invalid_group_element
    | _ -> raise Utils.unknown_error
end