package tezos-bls12-381-polynomial

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tezos-bls12-381-polynomial
- Bls12_381_polynomial
  - Domain
  - Evaluations
  - Polynomial
  - S
    
    Domain
    
    Evaluations
    
    Polynomial
    
    Srs
    
    Srs_g1
    
    Srs_g2
  - Srs
    
    Srs_g1
    
    Srs_g2

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type polynomial = Polynomial.t

type t

val t : t Repr.t

type elt = Bls12_381.G1.t

val empty : t

val get : t -> int -> elt

get srs i returns the i-th element of srs

val size : t -> int

Returns the pippenger ctxt size, i.e. the number of elements the context is supposed to be called with

val of_bigstring : 
  ?len:int ->
  Bigstringaf.t ->
  (t, [> `End_of_file of string | `Invalid_point of int ]) result

of_bigstring ~len bs reads len points of G in affine compressed format from bs and returns a Srs. If len is omitted the whole bs is read. The bigstring can be loaded from a file with:

let bigstring_of_file filename =
  let fd = Unix.openfile filename [ Unix.O_RDONLY ] 0o440 in
  Bigarray.array1_of_genarray
  @@ Unix.map_file fd Bigarray.char Bigarray.c_layout false
       [| (* [-1] means read the whole file *) -1 |]
in
Srs_g1.of_bigstring
      (bigstring_of_file ("srs_zcash_g1_21"))
      (1 lsl 5)

or with Lwt:

let bigstring_of_file filename =
  let fd = Unix.openfile filename [ Unix.O_RDONLY ] 0o440 in
  Lwt_bytes.map_file ~fd ~shared:false ()
in

val generate_insecure : int -> Bls12_381.Fr.t -> t

val pippenger : ?offset:int -> ?len:int -> t -> polynomial -> elt

pippenger ctxt poly computes the multiscalar exponentiation using the SRS saved in the context and the coefficients of the given polynomial

val to_array : ?len:int -> t -> elt array