bcrypt time cost at various difficulty factors

main.go

package main

import (
	"fmt"
	"log"
	"time"

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

const password = "somePassword"

func main() {
	for i := 4; i <= 17; i++ {
		start := time.Now()
		_, err := hashPassword(password, i)
		if err != nil {
			log.Fatal(err)
		}
		fmt.Printf("%2d %.03f\n", i, time.Since(start).Seconds())
	}
}

// hashPassword bcrypts a password
func hashPassword(pass string, cost int) ([]byte, error) {
	return bcrypt.GenerateFromPassword([]byte(pass), cost)
}