bn256 curve testing parameters generation

main.go

package main

import (
	// "crypto/rand"
	"fmt"
	"github.com/cloudflare/bn256"
	// "io"
	"math/big"
)

func main() {
 	// a and b are two private keys
	a, _ := new(big.Int).SetString("19863503168721767052470763080964584560829382977903706668947398297116896025507", 10)
	b, _ := new(big.Int).SetString("42411803530570037984902453521978100812441758711834278806081178240791067183758", 10)

  	// qa and qb are cooresponding public keys
	qa := new(bn256.G1).ScalarBaseMult(a)
	qb := new(bn256.G1).ScalarBaseMult(b)
	fmt.Println(qa)
 	 // k1 and k2 are ECDH shared key thus should equal
	k1 := new(bn256.G1).ScalarMult(qa, b)
	k2 := new(bn256.G1).ScalarMult(qb, a)
	fmt.Println(k1)
	fmt.Println(k2)
  
	one := big.NewInt(1)
  	// gen is the generator of G1
	gen := new(bn256.G1).ScalarBaseMult(one)
	fmt.Println(gen)
	
	// weird behavior in precompile: inputting (1,2,1) gives the right answer, while (1,2,2) would give
	// different answer than the following "result" variable.
	m, err := hex.DecodeString("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002")
	if err != nil {
		fmt.Println(err)
	}
	p := new(bn256.G1)
	p.Unmarshal(m)
	fmt.Println(p)
	result := new(bn256.G1)
	result.ScalarMult(p, big.NewInt(2))
	fmt.Println(result)
}