Ethereum Sha3 (Keccak256) in Golang

sha3.go

package main

import (
	"encoding/hex"
	"fmt"
	"github.com/ethereum/go-ethereum/crypto/sha3"
)

func main() {
	hash := sha3.NewKeccak256()

	var buf []byte
	//hash.Write([]byte{0xcc})
	hash.Write(decodeHex("cc"))
	buf = hash.Sum(nil)

	fmt.Println(hex.EncodeToString(buf))
	//expected := "EEAD6DBFC7340A56CAEDC044696A168870549A6A7F6F56961E84A54BD9970B8A"
}

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