github.com/ethereum/go-ethereum@v1.14.3/tests/fuzzers/secp256k1/secp_test.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  package secp256k1
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  
    23  	"github.com/btcsuite/btcd/btcec/v2"
    24  	"github.com/ethereum/go-ethereum/crypto/secp256k1"
    25  )
    26  
    27  func TestFuzzer(t *testing.T) {
    28  	a, b := "00000000N0000000/R0000000000000000", "0U0000S0000000mkhP000000000000000U"
    29  	fuzz([]byte(a), []byte(b))
    30  }
    31  
    32  func Fuzz(f *testing.F) {
    33  	f.Fuzz(func(t *testing.T, a, b []byte) {
    34  		fuzz(a, b)
    35  	})
    36  }
    37  
    38  func fuzz(dataP1, dataP2 []byte) {
    39  	var (
    40  		curveA = secp256k1.S256()
    41  		curveB = btcec.S256()
    42  	)
    43  	// first point
    44  	x1, y1 := curveB.ScalarBaseMult(dataP1)
    45  	// second points
    46  	x2, y2 := curveB.ScalarBaseMult(dataP2)
    47  	resAX, resAY := curveA.Add(x1, y1, x2, y2)
    48  	resBX, resBY := curveB.Add(x1, y1, x2, y2)
    49  	if resAX.Cmp(resBX) != 0 || resAY.Cmp(resBY) != 0 {
    50  		fmt.Printf("%s %s %s %s\n", x1, y1, x2, y2)
    51  		panic(fmt.Sprintf("Addition failed: geth: %s %s btcd: %s %s", resAX, resAY, resBX, resBY))
    52  	}
    53  }