ebb9591c4d
* crypto/bn256: fix bn256Mul fuzzer to not hang on large input * Update crypto/bn256/bn256_fuzz.go Co-authored-by: ligi <ligi@ligi.de> Co-authored-by: ligi <ligi@ligi.de>
120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
// Copyright 2018 Péter Szilágyi. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be found
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// in the LICENSE file.
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// +build gofuzz
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package bn256
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import (
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"bytes"
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"fmt"
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"io"
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"math/big"
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cloudflare "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
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google "github.com/ethereum/go-ethereum/crypto/bn256/google"
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)
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func getG1Points(input io.Reader) (*cloudflare.G1, *google.G1) {
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_, xc, err := cloudflare.RandomG1(input)
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if err != nil {
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// insufficient input
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return nil, nil
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}
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xg := new(google.G1)
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if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
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panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
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}
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return xc, xg
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}
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func getG2Points(input io.Reader) (*cloudflare.G2, *google.G2) {
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_, xc, err := cloudflare.RandomG2(input)
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if err != nil {
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// insufficient input
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return nil, nil
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}
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xg := new(google.G2)
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if _, err := xg.Unmarshal(xc.Marshal()); err != nil {
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panic(fmt.Sprintf("Could not marshal cloudflare -> google:", err))
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}
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return xc, xg
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}
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// FuzzAdd fuzzez bn256 addition between the Google and Cloudflare libraries.
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func FuzzAdd(data []byte) int {
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input := bytes.NewReader(data)
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xc, xg := getG1Points(input)
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if xc == nil {
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return 0
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}
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yc, yg := getG1Points(input)
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if yc == nil {
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return 0
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}
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// Ensure both libs can parse the second curve point
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// Add the two points and ensure they result in the same output
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rc := new(cloudflare.G1)
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rc.Add(xc, yc)
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rg := new(google.G1)
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rg.Add(xg, yg)
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if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
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panic("add mismatch")
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}
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return 1
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}
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// FuzzMul fuzzez bn256 scalar multiplication between the Google and Cloudflare
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// libraries.
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func FuzzMul(data []byte) int {
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input := bytes.NewReader(data)
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pc, pg := getG1Points(input)
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if pc == nil {
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return 0
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}
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// Add the two points and ensure they result in the same output
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remaining := input.Len()
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if remaining == 0 {
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return 0
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}
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if remaining > 128 {
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// The evm only ever uses 32 byte integers, we need to cap this otherwise
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// we run into slow exec. A 236Kb byte integer cause oss-fuzz to report it as slow.
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// 128 bytes should be fine though
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return 0
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}
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buf := make([]byte, remaining)
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input.Read(buf)
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rc := new(cloudflare.G1)
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rc.ScalarMult(pc, new(big.Int).SetBytes(buf))
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rg := new(google.G1)
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rg.ScalarMult(pg, new(big.Int).SetBytes(buf))
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if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
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panic("scalar mul mismatch")
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}
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return 1
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}
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func FuzzPair(data []byte) int {
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input := bytes.NewReader(data)
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pc, pg := getG1Points(input)
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if pc == nil {
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return 0
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}
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tc, tg := getG2Points(input)
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if tc == nil {
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return 0
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}
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// Pair the two points and ensure thet result in the same output
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if cloudflare.PairingCheck([]*cloudflare.G1{pc}, []*cloudflare.G2{tc}) != google.PairingCheck([]*google.G1{pg}, []*google.G2{tg}) {
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panic("pair mismatch")
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}
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return 1
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}
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