gistfile1.txt

package main

import (
	"fmt"
	"time"

	"golang.org/x/crypto/bcrypt"
)

func main() {
	pass := generatePassword(1 * 1024)
	start := time.Now()
	testPasswordLength(pass)
	fmt.Println("1 KiB password took", time.Since(start))
	fmt.Println("")

	pass = generatePassword(1 * 1024 * 1024)
	start = time.Now()
	testPasswordLength(pass)
	fmt.Println("1 MiB password took", time.Since(start))
	fmt.Println("")

	pass = generatePassword(100 * 1024 * 1024)
	start = time.Now()
	testPasswordLength(pass)
	fmt.Println("100 MiB password took", time.Since(start))
	fmt.Println("")

	pass = generatePassword(1 * 1024 * 1024 * 1024)
	start = time.Now()
	testPasswordLength(pass)
	fmt.Println("1 GiB password took", time.Since(start))
	fmt.Println("")

	pass = generatePassword(8 * 1024 * 1024 * 1024)
	start = time.Now()
	testPasswordLength(pass)
	fmt.Println("8 GiB password took", time.Since(start))
	fmt.Println("")
}

func testPasswordLength(pass []byte) {
	t0 := time.Now()
	hp, err := bcrypt.GenerateFromPassword(pass, 0)
	if err != nil {
		panic(fmt.Sprintf("GenerateFromPassword error: %s", err))
	}
	fmt.Println("\tGenerateFromPassword:", time.Since(t0))
	fmt.Println("\thashed password length:", len(hp))

	t1 := time.Now()
	if bcrypt.CompareHashAndPassword(hp, pass) != nil {
		panic(fmt.Sprintf("%v should hash %s correctly", hp, pass))
	}
	fmt.Println("\tCompareHashAndPassword:", time.Since(t1))
}

func generatePassword(length int) []byte {
	var password []byte
	for i := 0; i < length; i++ {
		password = append(password, byte(i))
	}
	return password
}