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bn256_fuzz.go
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bn256_fuzz.go
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// Copyright 2018 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/>.
// +build gofuzz
package bn256
import (
"bytes"
"fmt"
"io"
"math/big"
cloudflare "github.com/XinFinOrg/XDPoSChain/crypto/bn256/cloudflare"
google "github.com/XinFinOrg/XDPoSChain/crypto/bn256/google"
)
func getG1Points(input io.Reader) (*cloudflare.G1, *google.G1) {
_, xc, err := cloudflare.RandomG1(input)
if err != nil {
// insufficient input
return nil, nil
}
xg := new(google.G1)
if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
}
return xc, xg
}
func getG2Points(input io.Reader) (*cloudflare.G2, *google.G2) {
_, xc, err := cloudflare.RandomG2(input)
if err != nil {
// insufficient input
return nil, nil
}
xg := new(google.G2)
if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
}
return xc, xg
}
// FuzzAdd fuzzez bn256 addition between the Google and Cloudflare libraries.
func FuzzAdd(data []byte) int {
input := bytes.NewReader(data)
xc, xg := getG1Points(input)
if xc == nil {
return 0
}
yc, yg := getG1Points(input)
if yc == nil {
return 0
}
// Ensure both libs can parse the second curve point
// Add the two points and ensure they result in the same output
rc := new(cloudflare.G1)
rc.Add(xc, yc)
rg := new(google.G1)
rg.Add(xg, yg)
if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
panic("add mismatch")
}
return 1
}
// FuzzMul fuzzez bn256 scalar multiplication between the Google and Cloudflare
// libraries.
func FuzzMul(data []byte) int {
input := bytes.NewReader(data)
pc, pg := getG1Points(input)
if pc == nil {
return 0
}
// Add the two points and ensure they result in the same output
remaining := input.Len()
if remaining == 0 {
return 0
}
buf := make([]byte, remaining)
input.Read(buf)
rc := new(cloudflare.G1)
rc.ScalarMult(pc, new(big.Int).SetBytes(buf))
rg := new(google.G1)
rg.ScalarMult(pg, new(big.Int).SetBytes(buf))
if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
panic("scalar mul mismatch")
}
return 1
}
func FuzzPair(data []byte) int {
input := bytes.NewReader(data)
pc, pg := getG1Points(input)
if pc == nil {
return 0
}
tc, tg := 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")
}
return 1
}