我的客户端使用基本身份验证进行身份验证。我以这种形式存储他们的密码-sha256（明文密码+salt），“salt”值存储在数据库中每个用户的单独列中。客户端以明文形式向控制器发送密码。这意味着，应该按如下方式检查密码：我从basicauth头中提取cleartext_密码，从数据库中获取该用户的salt值，并执行这样的转换-sha256（cleartext_密码+salt），然后检查结果字符串和存储在数据库中的字符串是否匹配。问题是，在spring security将传入密码与userdetailsservice返回的密码（来自数据库的密码）进行比较之前，如何将传入密码（basicauth）转换为-sha256（明文密码+salt）格式？
以下是我当前的securityconfig和CustomUserDetails服务：

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    private final UserDetailsService customUserDetailsService;

    public SecurityConfig(UserDetailsService customUserDetailsService) {
        this.customUserDetailsService = customUserDetailsService;
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .csrf().disable()
                .authorizeRequests()
                .requestMatchers(EndpointRequest.toAnyEndpoint()).permitAll()
                .anyRequest().authenticated()
                .and().httpBasic();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(customUserDetailsService)
        .passwordEncoder(PasswordEncoderFactories.createDelegatingPasswordEncoder());
    }

}

@Component
public class CustomUserDetailsService implements UserDetailsService {
    private final UserRepository userRepository;

    public CustomUserDetailsService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUserName(username);
        if (user != null){
            return org.springframework.security.core.userdetails.
                    User.withUsername(username)
                    .password(PasswordEncoderFactories.createDelegatingPasswordEncoder().encode(user.getPassword()))
                    .roles("USER")
                    .build();
        }
        throw new IllegalArgumentException();
    }
}