// encode password string, return encoded string and salt
func EncodePassword(pwd string) (string, string) {
tmp := time.Now().Format(time.RFC3339)
salt := utils.Md5String(tmp)[8:24]
return utils.Sha256String(pwd + salt), salt
}
// check password string
func (u *User) CheckPassword(str string) bool {
pwd := utils.Sha256String(str + u.Salt)
return pwd == u.Password
}