package main

import (
	"encoding/hex"
	"fmt"

	"github.com/bytom/crypto/sm2/chainkd"
)

func main() {
	strXpub := "02e097442c49eccae999f7687e088c918838df8d804980a220dba6bd7a51258e76347a32ad977251122e50456dcfe155d80cbfa83186a64f7756f044a126e664ac"
	byteXpub := decodeHexString(strXpub)
	xpub := new(chainkd.XPub)
	copy(xpub[:], byteXpub[:])

	bytePath := [][]byte{decodeHexString("00010203"), decodeHexString("03ededed"), decodeHexString("123456")}

	ChildXpub := xpub.Derive(bytePath)
	byteChildXpub := make([]byte, 65)
	copy(byteChildXpub[:], ChildXpub[:])
	strChildXpub := hex.EncodeToString(byteChildXpub)

	fmt.Println("xpub: ", hex.EncodeToString(byteXpub))
	fmt.Println("path: ")
	for _, p := range bytePath {
		fmt.Println(hex.EncodeToString(p))
	}
	fmt.Println("child xpub: ", strChildXpub)
}

func decodeHexString(hexStr string) (b []byte) {
	b, err := hex.DecodeString(hexStr)
	if err != nil {
		panic(err)
	}
	return
}