// Copyright 2023 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package hash import (	"golang.org/x/crypto/bcrypt") func init() {	MustRegister("bcrypt", NewBcryptHasher)} // BcryptHasher implements PasswordHasher// and uses the bcrypt password hash function.type BcryptHasher struct {	cost int} // HashWithSaltBytes a provided password and saltfunc (hasher *BcryptHasher) HashWithSaltBytes(password string, salt []byte) string {	if hasher == nil {		return ""	}	hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(password), hasher.cost)	return string(hashedPassword)} func (hasher *BcryptHasher) VerifyPassword(password, hashedPassword, salt string) bool {	return bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(password)) == nil} // NewBcryptHasher is a factory method to create an BcryptHasher// The provided config should be either empty or the string representation of the "<cost>"// as an integerfunc NewBcryptHasher(config string) *BcryptHasher {	// This matches the original configuration for `bcrypt` prior to storing hash parameters	// in the database.	// THESE VALUES MUST NOT BE CHANGED OR BACKWARDS COMPATIBILITY WILL BREAK	hasher := &BcryptHasher{		cost: 10, // cost=10. i.e. 2^10 rounds of key expansion.	} 	if config == "" {		return hasher	}	var err error	hasher.cost, err = parseIntParam(config, "cost", "bcrypt", config, nil)	if err != nil {		return nil	} 	return hasher}