package main

import (
	"crypto/rand"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
)

func GenerateRandomHash(n int) (string, error) {
	b := make([]byte, n)
	_, err := rand.Read(b)

	// Note that err == nil only if we read len(b) bytes.
	if err != nil {
		return "", err
	}

	hasher := sha256.New()
	hasher.Write(b)
	sha := hex.EncodeToString(hasher.Sum(nil))

	return sha, nil
}

func main() {
	hash, err := GenerateRandomHash(512)

	if err != nil {
		panic(err)
	}

	fmt.Println(hash)
}

// go run main.go 
// 34c0fb393623843e56719b5d9d66385a55b4b4d3393187b7b1a76aee46c421c5