package corelib

import (
	"crypto/md5"
	"encoding/hex"
	"golang.org/x/crypto/bcrypt"
)

// Md5Hash md5加密
func Md5Hash(data string) string {
	md5Hash := md5.New()
	md5Hash.Write([]byte(data))
	return hex.EncodeToString(md5Hash.Sum(nil))
}

// HashPassword 使用Bcrypt哈希密码和盐值
func HashPassword(password, salt string) (string, error) {
	var (
		err            error
		hashedPassword []byte
	)
	passwordWithSalt := append([]byte(password), []byte(salt)...)
	if hashedPassword, err = bcrypt.GenerateFromPassword(passwordWithSalt, bcrypt.DefaultCost); err != nil {
		return "", err
	}
	return string(hashedPassword), nil
}

// ComparePasswords 验证密码是否匹配哈希值和盐值
func ComparePasswords(hashedPassword, userInput, salt string) bool {
	passwordWithSalt := append([]byte(userInput), []byte(salt)...)
	err := bcrypt.CompareHashAndPassword([]byte(hashedPassword), passwordWithSalt)
	return err == nil
}