5e8fa1da70
* tests/fuzzers/bls12381: fix blst pairing * tests/fuzzers/bls12381: only build on gofuzz * tests/fuzzers/bls12381: remove unused code * tests/fuzzers/bls12381: remove unused code
305 lines
7.8 KiB
Go
305 lines
7.8 KiB
Go
// Copyright 2021 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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//go:build gofuzz
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// +build gofuzz
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package bls
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import (
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"bytes"
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"crypto/rand"
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"fmt"
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"io"
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"math/big"
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gnark "github.com/consensys/gnark-crypto/ecc/bls12-381"
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"github.com/consensys/gnark-crypto/ecc/bls12-381/fp"
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"github.com/consensys/gnark-crypto/ecc/bls12-381/fr"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto/bls12381"
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blst "github.com/supranational/blst/bindings/go"
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)
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func FuzzCrossPairing(data []byte) int {
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input := bytes.NewReader(data)
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// get random G1 points
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kpG1, cpG1, blG1, err := getG1Points(input)
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if err != nil {
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return 0
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}
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// get random G2 points
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kpG2, cpG2, blG2, err := getG2Points(input)
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if err != nil {
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return 0
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}
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// compute pairing using geth
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engine := bls12381.NewPairingEngine()
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engine.AddPair(kpG1, kpG2)
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kResult := engine.Result()
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// compute pairing using gnark
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cResult, err := gnark.Pair([]gnark.G1Affine{*cpG1}, []gnark.G2Affine{*cpG2})
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if err != nil {
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panic(fmt.Sprintf("gnark/bls12381 encountered error: %v", err))
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}
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// compare result
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if !(bytes.Equal(cResult.Marshal(), bls12381.NewGT().ToBytes(kResult))) {
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panic("pairing mismatch gnark / geth ")
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}
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// compute pairing using blst
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blstResult := blst.Fp12MillerLoop(blG2, blG1)
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blstResult.FinalExp()
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res := massageBLST(blstResult.ToBendian())
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if !(bytes.Equal(res, bls12381.NewGT().ToBytes(kResult))) {
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panic("pairing mismatch blst / geth")
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}
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return 1
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}
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func massageBLST(in []byte) []byte {
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out := make([]byte, len(in))
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len := 12 * 48
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// 1
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copy(out[0:], in[len-1*48:len])
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copy(out[1*48:], in[len-2*48:len-1*48])
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// 2
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copy(out[6*48:], in[len-3*48:len-2*48])
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copy(out[7*48:], in[len-4*48:len-3*48])
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// 3
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copy(out[2*48:], in[len-5*48:len-4*48])
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copy(out[3*48:], in[len-6*48:len-5*48])
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// 4
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copy(out[8*48:], in[len-7*48:len-6*48])
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copy(out[9*48:], in[len-8*48:len-7*48])
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// 5
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copy(out[4*48:], in[len-9*48:len-8*48])
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copy(out[5*48:], in[len-10*48:len-9*48])
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// 6
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copy(out[10*48:], in[len-11*48:len-10*48])
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copy(out[11*48:], in[len-12*48:len-11*48])
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return out
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}
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func FuzzCrossG1Add(data []byte) int {
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input := bytes.NewReader(data)
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// get random G1 points
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kp1, cp1, bl1, err := getG1Points(input)
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if err != nil {
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return 0
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}
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// get random G1 points
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kp2, cp2, bl2, err := getG1Points(input)
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if err != nil {
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return 0
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}
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// compute kp = kp1 + kp2
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g1 := bls12381.NewG1()
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kp := bls12381.PointG1{}
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g1.Add(&kp, kp1, kp2)
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// compute cp = cp1 + cp2
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_cp1 := new(gnark.G1Jac).FromAffine(cp1)
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_cp2 := new(gnark.G1Jac).FromAffine(cp2)
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cp := new(gnark.G1Affine).FromJacobian(_cp1.AddAssign(_cp2))
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// compare result
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if !(bytes.Equal(cp.Marshal(), g1.ToBytes(&kp))) {
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panic("G1 point addition mismatch gnark / geth ")
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}
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bl3 := blst.P1AffinesAdd([]*blst.P1Affine{bl1, bl2})
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if !(bytes.Equal(cp.Marshal(), bl3.Serialize())) {
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panic("G1 point addition mismatch blst / geth ")
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}
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return 1
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}
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func FuzzCrossG2Add(data []byte) int {
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input := bytes.NewReader(data)
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// get random G2 points
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kp1, cp1, bl1, err := getG2Points(input)
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if err != nil {
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return 0
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}
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// get random G2 points
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kp2, cp2, bl2, err := getG2Points(input)
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if err != nil {
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return 0
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}
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// compute kp = kp1 + kp2
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g2 := bls12381.NewG2()
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kp := bls12381.PointG2{}
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g2.Add(&kp, kp1, kp2)
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// compute cp = cp1 + cp2
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_cp1 := new(gnark.G2Jac).FromAffine(cp1)
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_cp2 := new(gnark.G2Jac).FromAffine(cp2)
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cp := new(gnark.G2Affine).FromJacobian(_cp1.AddAssign(_cp2))
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// compare result
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if !(bytes.Equal(cp.Marshal(), g2.ToBytes(&kp))) {
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panic("G2 point addition mismatch gnark / geth ")
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}
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bl3 := blst.P2AffinesAdd([]*blst.P2Affine{bl1, bl2})
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if !(bytes.Equal(cp.Marshal(), bl3.Serialize())) {
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panic("G1 point addition mismatch blst / geth ")
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}
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return 1
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}
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func FuzzCrossG1MultiExp(data []byte) int {
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var (
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input = bytes.NewReader(data)
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gethScalars []*big.Int
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gnarkScalars []fr.Element
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gethPoints []*bls12381.PointG1
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gnarkPoints []gnark.G1Affine
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)
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// n random scalars (max 17)
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for i := 0; i < 17; i++ {
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// note that geth/crypto/bls12381 works only with scalars <= 32bytes
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s, err := randomScalar(input, fr.Modulus())
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if err != nil {
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break
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}
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// get a random G1 point as basis
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kp1, cp1, _, err := getG1Points(input)
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if err != nil {
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break
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}
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gethScalars = append(gethScalars, s)
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var gnarkScalar = &fr.Element{}
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gnarkScalar = gnarkScalar.SetBigInt(s).FromMont()
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gnarkScalars = append(gnarkScalars, *gnarkScalar)
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gethPoints = append(gethPoints, new(bls12381.PointG1).Set(kp1))
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gnarkPoints = append(gnarkPoints, *cp1)
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}
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if len(gethScalars) == 0 {
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return 0
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}
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// compute multi exponentiation
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g1 := bls12381.NewG1()
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kp := bls12381.PointG1{}
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if _, err := g1.MultiExp(&kp, gethPoints, gethScalars); err != nil {
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panic(fmt.Sprintf("G1 multi exponentiation errored (geth): %v", err))
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}
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// note that geth/crypto/bls12381.MultiExp mutates the scalars slice (and sets all the scalars to zero)
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// gnark multi exp
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cp := new(gnark.G1Affine)
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cp.MultiExp(gnarkPoints, gnarkScalars)
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// compare result
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if !(bytes.Equal(cp.Marshal(), g1.ToBytes(&kp))) {
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panic("G1 multi exponentiation mismatch gnark / geth ")
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}
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return 1
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}
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func getG1Points(input io.Reader) (*bls12381.PointG1, *gnark.G1Affine, *blst.P1Affine, error) {
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// sample a random scalar
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s, err := randomScalar(input, fp.Modulus())
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if err != nil {
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return nil, nil, nil, err
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}
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// compute a random point
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cp := new(gnark.G1Affine)
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_, _, g1Gen, _ := gnark.Generators()
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cp.ScalarMultiplication(&g1Gen, s)
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cpBytes := cp.Marshal()
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// marshal gnark point -> geth point
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g1 := bls12381.NewG1()
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kp, err := g1.FromBytes(cpBytes)
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if err != nil {
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panic(fmt.Sprintf("Could not marshal gnark.G1 -> geth.G1: %v", err))
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}
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if !bytes.Equal(g1.ToBytes(kp), cpBytes) {
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panic("bytes(gnark.G1) != bytes(geth.G1)")
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}
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// marshal gnark point -> blst point
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scalar := new(blst.Scalar).FromBEndian(common.LeftPadBytes(s.Bytes(), 32))
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p1 := new(blst.P1Affine).From(scalar)
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if !bytes.Equal(p1.Serialize(), cpBytes) {
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panic("bytes(blst.G1) != bytes(geth.G1)")
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}
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return kp, cp, p1, nil
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}
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func getG2Points(input io.Reader) (*bls12381.PointG2, *gnark.G2Affine, *blst.P2Affine, error) {
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// sample a random scalar
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s, err := randomScalar(input, fp.Modulus())
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if err != nil {
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return nil, nil, nil, err
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}
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// compute a random point
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cp := new(gnark.G2Affine)
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_, _, _, g2Gen := gnark.Generators()
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cp.ScalarMultiplication(&g2Gen, s)
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cpBytes := cp.Marshal()
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// marshal gnark point -> geth point
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g2 := bls12381.NewG2()
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kp, err := g2.FromBytes(cpBytes)
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if err != nil {
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panic(fmt.Sprintf("Could not marshal gnark.G2 -> geth.G2: %v", err))
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}
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if !bytes.Equal(g2.ToBytes(kp), cpBytes) {
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panic("bytes(gnark.G2) != bytes(geth.G2)")
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}
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// marshal gnark point -> blst point
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// Left pad the scalar to 32 bytes
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scalar := new(blst.Scalar).FromBEndian(common.LeftPadBytes(s.Bytes(), 32))
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p2 := new(blst.P2Affine).From(scalar)
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if !bytes.Equal(p2.Serialize(), cpBytes) {
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panic("bytes(blst.G2) != bytes(geth.G2)")
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}
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return kp, cp, p2, nil
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}
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func randomScalar(r io.Reader, max *big.Int) (k *big.Int, err error) {
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for {
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k, err = rand.Int(r, max)
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if err != nil || k.Sign() > 0 {
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return
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}
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}
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}
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