99 lines
3.4 KiB
Go
99 lines
3.4 KiB
Go
// Copyright 2023 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package kzg4844
|
|
|
|
import (
|
|
"encoding/json"
|
|
"sync"
|
|
|
|
gokzg4844 "github.com/crate-crypto/go-kzg-4844"
|
|
)
|
|
|
|
// context is the crypto primitive pre-seeded with the trusted setup parameters.
|
|
var context *gokzg4844.Context
|
|
|
|
// gokzgIniter ensures that we initialize the KZG library once before using it.
|
|
var gokzgIniter sync.Once
|
|
|
|
// gokzgInit initializes the KZG library with the provided trusted setup.
|
|
func gokzgInit() {
|
|
config, err := content.ReadFile("trusted_setup.json")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
params := new(gokzg4844.JSONTrustedSetup)
|
|
if err = json.Unmarshal(config, params); err != nil {
|
|
panic(err)
|
|
}
|
|
context, err = gokzg4844.NewContext4096(params)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
|
|
// gokzgBlobToCommitment creates a small commitment out of a data blob.
|
|
func gokzgBlobToCommitment(blob Blob) (Commitment, error) {
|
|
gokzgIniter.Do(gokzgInit)
|
|
|
|
commitment, err := context.BlobToKZGCommitment((gokzg4844.Blob)(blob), 0)
|
|
if err != nil {
|
|
return Commitment{}, err
|
|
}
|
|
return (Commitment)(commitment), nil
|
|
}
|
|
|
|
// gokzgComputeProof computes the KZG proof at the given point for the polynomial
|
|
// represented by the blob.
|
|
func gokzgComputeProof(blob Blob, point Point) (Proof, Claim, error) {
|
|
gokzgIniter.Do(gokzgInit)
|
|
|
|
proof, claim, err := context.ComputeKZGProof((gokzg4844.Blob)(blob), (gokzg4844.Scalar)(point), 0)
|
|
if err != nil {
|
|
return Proof{}, Claim{}, err
|
|
}
|
|
return (Proof)(proof), (Claim)(claim), nil
|
|
}
|
|
|
|
// gokzgVerifyProof verifies the KZG proof that the polynomial represented by the blob
|
|
// evaluated at the given point is the claimed value.
|
|
func gokzgVerifyProof(commitment Commitment, point Point, claim Claim, proof Proof) error {
|
|
gokzgIniter.Do(gokzgInit)
|
|
|
|
return context.VerifyKZGProof((gokzg4844.KZGCommitment)(commitment), (gokzg4844.Scalar)(point), (gokzg4844.Scalar)(claim), (gokzg4844.KZGProof)(proof))
|
|
}
|
|
|
|
// gokzgComputeBlobProof returns the KZG proof that is used to verify the blob against
|
|
// the commitment.
|
|
//
|
|
// This method does not verify that the commitment is correct with respect to blob.
|
|
func gokzgComputeBlobProof(blob Blob, commitment Commitment) (Proof, error) {
|
|
gokzgIniter.Do(gokzgInit)
|
|
|
|
proof, err := context.ComputeBlobKZGProof((gokzg4844.Blob)(blob), (gokzg4844.KZGCommitment)(commitment), 0)
|
|
if err != nil {
|
|
return Proof{}, err
|
|
}
|
|
return (Proof)(proof), nil
|
|
}
|
|
|
|
// gokzgVerifyBlobProof verifies that the blob data corresponds to the provided commitment.
|
|
func gokzgVerifyBlobProof(blob Blob, commitment Commitment, proof Proof) error {
|
|
gokzgIniter.Do(gokzgInit)
|
|
|
|
return context.VerifyBlobKZGProof((gokzg4844.Blob)(blob), (gokzg4844.KZGCommitment)(commitment), (gokzg4844.KZGProof)(proof))
|
|
}
|