bcrypt.go

package main

import (
	"fmt"

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

const (
	password = "hello"
	fail     = "helloo"
)

func main() {
	hash, err := bcrypt.GenerateFromPassword([]byte(password), 1)
	if err != nil {
		panic(err)
	}
	fmt.Printf("%x\n", hash)

	err = bcrypt.CompareHashAndPassword(hash, []byte(fail))
	if err != nil {
		fmt.Printf("bcrypt.Err: %p %#v\n", bcrypt.ErrMismatchedHashAndPassword, bcrypt.ErrMismatchedHashAndPassword)
		fmt.Printf("err: %p %#v\n", err, err)
	}
}

result.txt

> ./bcrypt
243261243130244f4954376a3732346a4635334a5a467932646d42794f5478734430374f7037765562396e64765772675769306931736b3237645661
bcrypt.Err: 0x2081f22b0 &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}
err: 0x2081f22b0 &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}