rand_hash.go

package main

import (
	"crypto/sha256"
	"fmt"
	"io/ioutil"
	"os"
	"strconv"
)

func main() {
	iterations, err := strconv.Atoi(os.Args[1])
	if err != nil {
		iterations = 1
	}

	data, _ := ioutil.ReadFile("rand.txt")
	hash := getHash(data, iterations)

	fmt.Printf("%x\n", hash)
}

func getHash(data []byte, iterations int) []byte {
	for i := 0; i < iterations; i++ {
		hash := sha256.New()
		hash.Write(data)
		data = hash.Sum(nil)
	}

	return data
}