package main

import (

	"crypto/sha256"

	"encoding/hex"

	"fmt"

	"io"

	"os"

)

func gethash(path string) (hash string) {

	file, err := os.Open(path)

	if err == nil {

		h_ob := sha256.New()

		_, err := io.Copy(h_ob, file)

		if err == nil {

			hash := h_ob.Sum(nil)

			hashvalue := hex.EncodeToString(hash)

			return hashvalue

		} else {

			return "something wrong when use sha256 interface..."

		}

	} else {

		fmt.Printf("failed to open %s\n", path)

	}

	defer file.Close()

	return

}

func main() {

	path := "test"

	//path:="md5.go"

	hash := gethash(path)

	fmt.Printf("%s hash: %s", path, hash)

}

//test hash: 599593e4bd8f877acf8f00805e52eb0ffac4c662bc65349bf9eb3e3c9871a2bb