github.com/ethxdao/go-ethereum@v0.0.0-20221218102228-5ae34a9cc189/tests/fuzzers/secp256k1/secp_fuzzer.go (about)

     1  // Copyright 2021 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // build +gofuzz
    18  
    19  package secp256k1
    20  
    21  import (
    22  	"fmt"
    23  
    24  	"github.com/ethxdao/go-ethereum/crypto/secp256k1"
    25  	fuzz "github.com/google/gofuzz"
    26  )
    27  
    28  func Fuzz(input []byte) int {
    29  	var (
    30  		fuzzer = fuzz.NewFromGoFuzz(input)
    31  		curveA = secp256k1.S256()
    32  		curveB = btcec.S256()
    33  		dataP1 []byte
    34  		dataP2 []byte
    35  	)
    36  	// first point
    37  	fuzzer.Fuzz(&dataP1)
    38  	x1, y1 := curveB.ScalarBaseMult(dataP1)
    39  	// second point
    40  	fuzzer.Fuzz(&dataP2)
    41  	x2, y2 := curveB.ScalarBaseMult(dataP2)
    42  	resAX, resAY := curveA.Add(x1, y1, x2, y2)
    43  	resBX, resBY := curveB.Add(x1, y1, x2, y2)
    44  	if resAX.Cmp(resBX) != 0 || resAY.Cmp(resBY) != 0 {
    45  		fmt.Printf("%s %s %s %s\n", x1, y1, x2, y2)
    46  		panic(fmt.Sprintf("Addition failed: geth: %s %s btcd: %s %s", resAX, resAY, resBX, resBY))
    47  	}
    48  	return 0
    49  }