package crypto

import (
	"crypto/sha512"
	"encoding/hex"
	"io"
	"os"
)

func CalculateHash(p string) (string, error) {
	f, err := os.Open(p)
	if err != nil {
		return "", err
	}
	defer f.Close()

	h := sha512.New()
	if _, err := io.Copy(h, f); err != nil {
		return "", err
	}

	sum := h.Sum(nil)
	// return the sha checksum in hex
	return hex.EncodeToString(sum), nil
	// alternatively return in base64
	//return base64.StdEncoding.EncodeToString(sum), nil
}