127 lines
3.0 KiB
Go
127 lines
3.0 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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"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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// FuzzAdd fuzzez bn256 addition between the Google and Cloudflare libraries.
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func FuzzAdd(data []byte) int {
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// Ensure we have enough data in the first place
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if len(data) != 128 {
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return 0
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}
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// Ensure both libs can parse the first curve point
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xc := new(cloudflare.G1)
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_, errc := xc.Unmarshal(data[:64])
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xg := new(google.G1)
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_, errg := xg.Unmarshal(data[:64])
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if (errc == nil) != (errg == nil) {
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panic("parse mismatch")
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} else if errc != 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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yc := new(cloudflare.G1)
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_, errc = yc.Unmarshal(data[64:])
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yg := new(google.G1)
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_, errg = yg.Unmarshal(data[64:])
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if (errc == nil) != (errg == nil) {
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panic("parse mismatch")
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} else if errc != 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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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 0
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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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// Ensure we have enough data in the first place
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if len(data) != 96 {
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return 0
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}
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// Ensure both libs can parse the curve point
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pc := new(cloudflare.G1)
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_, errc := pc.Unmarshal(data[:64])
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pg := new(google.G1)
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_, errg := pg.Unmarshal(data[:64])
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if (errc == nil) != (errg == nil) {
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panic("parse mismatch")
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} else if errc != 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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rc := new(cloudflare.G1)
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rc.ScalarMult(pc, new(big.Int).SetBytes(data[64:]))
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rg := new(google.G1)
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rg.ScalarMult(pg, new(big.Int).SetBytes(data[64:]))
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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 0
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}
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func FuzzPair(data []byte) int {
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// Ensure we have enough data in the first place
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if len(data) != 192 {
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return 0
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}
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// Ensure both libs can parse the curve point
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pc := new(cloudflare.G1)
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_, errc := pc.Unmarshal(data[:64])
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pg := new(google.G1)
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_, errg := pg.Unmarshal(data[:64])
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if (errc == nil) != (errg == nil) {
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panic("parse mismatch")
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} else if errc != nil {
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return 0
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}
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// Ensure both libs can parse the twist point
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tc := new(cloudflare.G2)
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_, errc = tc.Unmarshal(data[64:])
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tg := new(google.G2)
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_, errg = tg.Unmarshal(data[64:])
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if (errc == nil) != (errg == nil) {
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panic("parse mismatch")
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} else if errc != 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 0
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}
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