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 (
  "crypto/md5"
  "fmt"
  "io"
  "os"
 )

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

  if err != nil {
 panic(err)
  }

  defer file.Close()

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

  if err != nil {
 panic(err)
  }

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

 }

Sample output :

utf8.txt MD5 checksum is 5af1ca1d92340d72a29c194d3f4096e0