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// 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.
// +build gofuzz
package bn256
import (
"bytes"
"math/big"
cloudflare "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
google "github.com/ethereum/go-ethereum/crypto/bn256/google"
)
// FuzzAdd fuzzez bn256 addition between the Google and Cloudflare libraries.
func FuzzAdd(data []byte) int {
// Ensure we have enough data in the first place
if len(data) != 128 {
return 0
}
// Ensure both libs can parse the first curve point
xc := new(cloudflare.G1)
_, errc := xc.Unmarshal(data[:64])
xg := new(google.G1)
_, errg := xg.Unmarshal(data[:64])
if (errc == nil) != (errg == nil) {
panic("parse mismatch")
} else if errc != nil {
return 0
}
// Ensure both libs can parse the second curve point
yc := new(cloudflare.G1)
_, errc = yc.Unmarshal(data[64:])
yg := new(google.G1)
_, errg = yg.Unmarshal(data[64:])
if (errc == nil) != (errg == nil) {
panic("parse mismatch")
} else if errc != nil {
return 0
}
// 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 0
}
// FuzzMul fuzzez bn256 scalar multiplication between the Google and Cloudflare
// libraries.
func FuzzMul(data []byte) int {
// Ensure we have enough data in the first place
if len(data) != 96 {
return 0
}
// Ensure both libs can parse the curve point
pc := new(cloudflare.G1)
_, errc := pc.Unmarshal(data[:64])
pg := new(google.G1)
_, errg := pg.Unmarshal(data[:64])
if (errc == nil) != (errg == nil) {
panic("parse mismatch")
} else if errc != nil {
return 0
}
// Add the two points and ensure they result in the same output
rc := new(cloudflare.G1)
rc.ScalarMult(pc, new(big.Int).SetBytes(data[64:]))
rg := new(google.G1)
rg.ScalarMult(pg, new(big.Int).SetBytes(data[64:]))
if !bytes.Equal(rc.Marshal(), rg.Marshal()) {
panic("scalar mul mismatch")
}
return 0
}
func FuzzPair(data []byte) int {
// Ensure we have enough data in the first place
if len(data) != 192 {
return 0
}
// Ensure both libs can parse the curve point
pc := new(cloudflare.G1)
_, errc := pc.Unmarshal(data[:64])
pg := new(google.G1)
_, errg := pg.Unmarshal(data[:64])
if (errc == nil) != (errg == nil) {
panic("parse mismatch")
} else if errc != nil {
return 0
}
// Ensure both libs can parse the twist point
tc := new(cloudflare.G2)
_, errc = tc.Unmarshal(data[64:])
tg := new(google.G2)
_, errg = tg.Unmarshal(data[64:])
if (errc == nil) != (errg == nil) {
panic("parse mismatch")
} else if errc != 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 0
}
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