Simple tool to get a bcrypt hash with a given cost. `go run bcrypt.go -password foobar -cost 20`

bcrypt.go

package main

import (
	"flag"
	"fmt"
	"os"

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

var password = flag.String("password", "", "password to hash")
var hash = flag.String("hash", "", "hash to compare to")
var cost = flag.Int("cost", 10, "password cost")

func main() {
	flag.Parse()
	if *hash == "" {
		h, e := bcrypt.GenerateFromPassword([]byte(*password), *cost)
		if e != nil {
			fmt.Println("ERR", e)
			os.Exit(1)
		}
		fmt.Println("hash: ", string(h))
	} else {
		e := bcrypt.CompareHashAndPassword([]byte(*hash), []byte(*password))
		if e != nil {
			fmt.Println("ERR", e)
			os.Exit(1)
		}
	}
}