Go example of generating subresource integrity hashes (https://www.srihash.org).

main.go

package main

import (
  "crypto/sha256"
  "crypto/sha512"
  "encoding/base64"
  "fmt"
  "io/ioutil"
  "log"
)

func main() {
  b, err := ioutil.ReadFile("/path/to/file")
  if err != nil {
    log.Fatal(err)
  }

  dgst256 := sha256.Sum256(b)
  fmt.Printf("sha256-%s\n", base64.StdEncoding.EncodeToString(dgst256[:]))
  dgst384 := sha512.Sum384(b)
  fmt.Printf("sha384-%s\n", base64.StdEncoding.EncodeToString(dgst384[:]))
  dgst512 := sha512.Sum512(b)
  fmt.Printf("sha512-%s\n", base64.StdEncoding.EncodeToString(dgst512[:]))
}