Spring Oauth2. Password encoder is not set in DaoAuthenticationProvider

I'm quite new to Spring Oauth and Spring Security. I'm trying to use the client_credentials flow in my project. For now i managed to user my own CustomDetailsService in order to fetch client_id and password (secret) from a database that already exists in my system. The only problem is that I cannot change the password encoder in DaoAuthenticationProvider that is used by AuthorizationServer - it is set by default to PlaintextPasswordEncoder. I wasn't able to configure it the way, that it would use for example SHAPasswordEncoder. It always uses the plaintext encoder. I probably don't understand the flow well enough, as I am a newbie in Spring.

Here's some code of mine (with not working configuration of DaoAuthenticationProvider):

SecurityConfig.java

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

private static final String RESOURCE_ID = "restservice";

@Override
public void configure(WebSecurity web) throws Exception {
    web.ignoring().antMatchers("/register/**");

}

@Override
public AuthenticationManager authenticationManagerBean() throws Exception {
    return super.authenticationManagerBean();
}

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.authenticationProvider(daoAuthenticationProvider());
}

@Bean
public DaoAuthenticationProvider daoAuthenticationProvider() {
    DaoAuthenticationProvider daoAuthenticationProvider = new DaoAuthenticationProvider();
    daoAuthenticationProvider.setUserDetailsService(userDetailsService());
    daoAuthenticationProvider.setPasswordEncoder(passwordEncoder());
    return daoAuthenticationProvider;
}

@Bean
public PasswordEncoder passwordEncoder() {
    return new ShaPasswordEncoder();
}

@Configuration
@EnableAuthorizationServer
protected static class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {

    @Autowired
    private MyCustomClientDetailsService myCustomClientDetailsService;

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints)
            throws Exception {
        endpoints.tokenStore(tokenStore());
    }

    @Bean
    public ResourceServerTokenServices defaultTokenServices() {
        final DefaultTokenServices defaultTokenServices = new DefaultTokenServices();
        defaultTokenServices.setSupportRefreshToken(true);
        defaultTokenServices.setTokenStore(tokenStore());
        return defaultTokenServices;
    }

    @Bean
    public TokenStore tokenStore() {
        return new InMemoryTokenStore();
    }

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.withClientDetails(myCustomClientDetailsService);
    }

    @Bean
    public MyCustomClientDetailsService detailsService() {
        return new MyCustomClientDetailsService();
    }
}

@Configuration
@EnableResourceServer
protected static class ResourceServerConfiguration extends ResourceServerConfigurerAdapter {

    ...
}
}

And the custom ClientDetailsService class:

public class MyCustomClientDetailsService implements ClientDetailsService {

@Autowired
private UserService userService;

@Override
public ClientDetails loadClientByClientId(String clientId) throws ClientRegistrationException {

    User fan = userService.getFan(clientId);

    if (fan == null) {
        throw new NoSuchClientException("No client with requested id: " + clientId);
    } 

    BaseClientDetails details = new BaseClientDetails(clientId, restservice, "write", "client_credentials", "USER");

    details.setClientSecret(fan.getEncodedPassword()); 

    return details;
}
}

The encodedPassword that is taken from my UserService is always a bad Credential, as DaoAuthenticationProvider has a PlaintextPasswordEncoder set by default.

What am i missing there? Is it possible to set the password encoder in the DaoAuthenticationProvider that is used for checking the credentials here? Or do I have to write my own AuthenticationProvider, that would check it the way i want?