Golang : Generate MD5 checksum of a file

This is an update to the previous tutorial on how to generate checksum for a file, except that this tutorial uses the io.Copy function instead of breaking up the file into chunks. io.Copy function reads a file content until it reaches EOF and it can be used to copy the file data into a MD5 hash.

 package main

 import (

 func main() {
  file, err := os.Open("utf8.txt")

  if err != nil {

  defer file.Close()

  hash := md5.New()
  _, err = io.Copy(hash, file)

  if err != nil {

  fmt.Printf("%s MD5 checksum is %x \n", file.Name(), hash.Sum(nil))


Sample output :

utf8.txt MD5 checksum is 5af1ca1d92340d72a29c194d3f4096e0

  See also : Generate checksum for a file in Go

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.