ether password test.

test.go

package main

import (
	"bytes"
	"encoding/hex"
	"flag"
	"github.com/ethereum/go-ethereum/crypto"
	"golang.org/x/crypto/scrypt"
	"log"
)

func main() {

	const (
		SALT_HEX   = "d42e9ef41c1f4b0b020cbe89ac4a37b9922861379da6775fdd7da598aba1ba42"
		CIPHER_HEX = "be849afadeb2db97f208c40a1b47d9de7754d884c05bce06251fd1cb47333d85"
		MAC_HEX    = "86d84ee41178e49d29ca552575a83b7d8e2a6fd7d5351a6425cc1d5fc901ac09"
	)

	var password = flag.String("password", "123456", "help message for flagname")
	flag.Parse()

	salt, _ := hex.DecodeString(SALT_HEX)
	dk, err := scrypt.Key([]byte(*password), salt, 262144, 8, 1, 32)
	if err != nil {
		log.Fatal(err)
	}

	cipherText, _ := hex.DecodeString(CIPHER_HEX) //ciphertext
	calculatedMAC := crypto.Keccak256(dk[16:32], cipherText)

	mac, _ := hex.DecodeString(MAC_HEX) //mac

	if bytes.Equal(calculatedMAC, mac) {
		log.Println("equal")
	} else {
		log.Println("error")
	}

}