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fuzzers: added consensys/gurvy library to bn256 differential fuzzer (#21812)

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This pr adds consensys' gurvy bn256 variant into the code for differential fuzzing.
This commit is contained in:
Marius van der Wijden
2021-02-03 15:04:28 +01:00
committed by GitHub
parent 3512b41c5c
commit 54735a6723
3 changed files with 180 additions and 18 deletions
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73
tests/fuzzers/bn256/bn256_fuzz.go
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@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style license that can be found
// in the LICENSE file.
// +build gofuzz
package bn256
import (
@ -10,44 +12,53 @@ import (
"io"
"math/big"
gurvy "github.com/consensys/gurvy/bn256"
cloudflare "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
google "github.com/ethereum/go-ethereum/crypto/bn256/google"
)
func getG1Points(input io.Reader) (*cloudflare.G1, *google.G1) {
func getG1Points(input io.Reader) (*cloudflare.G1, *google.G1, *gurvy.G1Affine) {
_, xc, err := cloudflare.RandomG1(input)
if err != nil {
// insufficient input
return nil, nil
return nil, nil, nil
}
xg := new(google.G1)
if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> google: %v", err))
panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
}
return xc, xg
xs := new(gurvy.G1Affine)
if err := xs.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> consensys:", err))
}
return xc, xg, xs
}
func getG2Points(input io.Reader) (*cloudflare.G2, *google.G2) {
func getG2Points(input io.Reader) (*cloudflare.G2, *google.G2, *gurvy.G2Affine) {
_, xc, err := cloudflare.RandomG2(input)
if err != nil {
// insufficient input
return nil, nil
return nil, nil, nil
}
xg := new(google.G2)
if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> google: %v", err))
panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
}
return xc, xg
xs := new(gurvy.G2Affine)
if err := xs.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> consensys:", err))
}
return xc, xg, xs
}
// FuzzAdd fuzzez bn256 addition between the Google and Cloudflare libraries.
func FuzzAdd(data []byte) int {
input := bytes.NewReader(data)
xc, xg := getG1Points(input)
xc, xg, xs := getG1Points(input)
if xc == nil {
return 0
}
yc, yg := getG1Points(input)
yc, yg, ys := getG1Points(input)
if yc == nil {
return 0
}
@ -59,8 +70,16 @@ func FuzzAdd(data []byte) int {
rg := new(google.G1)
rg.Add(xg, yg)
tmpX := new(gurvy.G1Jac).FromAffine(xs)
tmpY := new(gurvy.G1Jac).FromAffine(ys)
rs := new(gurvy.G1Affine).FromJacobian(tmpX.AddAssign(tmpY))
if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
panic("add mismatch")
panic("add mismatch: cloudflare/google")
}
if !bytes.Equal(rc.Marshal(), rs.Marshal()) {
panic("add mismatch: cloudflare/consensys")
}
return 1
}
@ -69,7 +88,7 @@ func FuzzAdd(data []byte) int {
// libraries.
func FuzzMul(data []byte) int {
input := bytes.NewReader(data)
pc, pg := getG1Points(input)
pc, pg, ps := getG1Points(input)
if pc == nil {
return 0
}
@ -93,25 +112,43 @@ func FuzzMul(data []byte) int {
rg := new(google.G1)
rg.ScalarMult(pg, new(big.Int).SetBytes(buf))
rs := new(gurvy.G1Jac)
psJac := new(gurvy.G1Jac).FromAffine(ps)
rs.ScalarMultiplication(psJac, new(big.Int).SetBytes(buf))
rsAffine := new(gurvy.G1Affine).FromJacobian(rs)
if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
panic("scalar mul mismatch")
panic("scalar mul mismatch: cloudflare/google")
}
if !bytes.Equal(rc.Marshal(), rsAffine.Marshal()) {
panic("scalar mul mismatch: cloudflare/consensys")
}
return 1
}
func FuzzPair(data []byte) int {
input := bytes.NewReader(data)
pc, pg := getG1Points(input)
pc, pg, ps := getG1Points(input)
if pc == nil {
return 0
}
tc, tg := getG2Points(input)
tc, tg, ts := getG2Points(input)
if tc == nil {
return 0
}
// Pair the two points and ensure thet result in the same output
if cloudflare.PairingCheck([]*cloudflare.G1{pc}, []*cloudflare.G2{tc}) != google.PairingCheck([]*google.G1{pg}, []*google.G2{tg}) {
panic("pair mismatch")
// Pair the two points and ensure they result in the same output
clPair := cloudflare.PairingCheck([]*cloudflare.G1{pc}, []*cloudflare.G2{tc})
if clPair != google.PairingCheck([]*google.G1{pg}, []*google.G2{tg}) {
panic("pairing mismatch: cloudflare/google")
}
coPair, err := gurvy.PairingCheck([]gurvy.G1Affine{*ps}, []gurvy.G2Affine{*ts})
if err != nil {
panic(fmt.Sprintf("gurvy encountered error: %v", err))
}
if clPair != coPair {
panic("pairing mismatch: cloudflare/consensys")
}
return 1
}