mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
2.8 KiB
117 lines
2.8 KiB
// Copyright 2018 Péter Szilágyi. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be found
|
|
// in the LICENSE file.
|
|
|
|
package bn256
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"math/big"
|
|
|
|
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) {
|
|
_, 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: %v", 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: %v", 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
|
|
}
|
|
if remaining > 128 {
|
|
// The evm only ever uses 32 byte integers, we need to cap this otherwise
|
|
// we run into slow exec. A 236Kb byte integer cause oss-fuzz to report it as slow.
|
|
// 128 bytes should be fine though
|
|
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
|
|
}
|
|
|