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