util/hashfile/hashfile.go

package hashfile

/*
	Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
*/

import (
	"crypto/sha256"
	"encoding/hex"
	"io"
	"os"
)

// SHA256 returns a sha256 hash of the file at the given filepath.
func SHA256(filePath string) (string, error) {
	f, err := os.Open(filePath)
	if err != nil {
		return "", err
	}
	defer f.Close()

	h := sha256.New()
	if _, err := io.Copy(h, f); err != nil {
		return "", err
	}

	hString := hex.EncodeToString(h.Sum(nil))

	return hString, nil
}