github.com/klaytn/klaytn@v1.12.1/crypto/secp256k1/curve_test.go (about)

     1  // Copyright 2018 The klaytn Authors
     2  //
     3  // This file is part of the klaytn library.
     4  //
     5  // The klaytn library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The klaytn library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the klaytn library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package secp256k1
    19  
    20  import (
    21  	"encoding/hex"
    22  	"fmt"
    23  	"testing"
    24  )
    25  
    26  func TestAddSamePoint(t *testing.T) {
    27  	/*
    28  		This test is intended to highlight the bug in klaytn/crypto/secp256k1/curve.go#affineFromJacobian.
    29  		When passed with same points, BitCurve.Add invokes affineFromJacobian(0, 0, 0) which then invokes
    30  		(big.Int).Mul(nil, nil).
    31  
    32  		Although executing (big.Int).Mul(nil, nil) is not problematic in Go 1.10.3, it has been found invoking the same
    33  		is fatal in Go 1.11 (causing SIGSEGV; terminating the program).
    34  
    35  	*/
    36  	x0, _ := hex.DecodeString("4f52e337ad8bf1ce10cbb72ab91d9954474cea39811040df5558297df3e3c1bf") // Alice
    37  	x1, _ := hex.DecodeString("4f52e337ad8bf1ce10cbb72ab91d9954474cea39811040df5558297df3e3c1bf") // Alice
    38  
    39  	G := S256()
    40  	P0x, P0y := G.ScalarBaseMult(x0)
    41  	P1x, P1y := G.ScalarBaseMult(x1)
    42  
    43  	Qx, Qy := G.Add(P0x, P0y, P1x, P1y)
    44  
    45  	fmt.Println(Qx, Qy) // should print 0 0 with no fatal error
    46  }