I am using the Apache Camel AS2 library in my Java project where I have implemented an AS2 server.
Currently, I’m generating a signed MDN response by configuring the certificate and algorithm in the server endpoint configuration, and it is working fine. However, I want to sign the MDN based on the AS2 request, where in headers, I will get the Mic algorithm that the user has requested. So, I want to sign using one of those algorithm at runtime, instead of hard-coding the algorithm at the endpoint creation.

I have also gone through the library code, and checked online, but I was not able to find any solution.

I have seen online server https://mendelson-e-c.com/as2_testserver which does the same, and signs according to the AS2 message, please help me in implementing this.

My server code is something like below, with signing defined in the endpoint configuration.

@Singleton
public class As2Server extends RouteBuilder {
    private final CamelContext camelContext;

    @Inject
    public As2Server(CamelContext camelContext) {
        this.camelContext = camelContext;
    }

    @Override
    public void configure() {
        try {
            from(configureServerEndpoint()).process(exchange -> {

            // processing logic

            });
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private Endpoint configureServerEndpoint() throws Exception {
        AS2Configuration endpointConfiguration = new AS2Configuration();
        endpointConfiguration.setApiName(AS2ApiName.SERVER);
        endpointConfiguration.setMethodName(AS2ServerManagerApiMethod.LISTEN.name());
        endpointConfiguration.setDecryptingPrivateKey(getPrivateKey());
        endpointConfiguration.setSigningPrivateKey(getPrivateKey());
        endpointConfiguration.setSigningCertificateChain(getCertificateChain());
        endpointConfiguration.setSigningAlgorithm(AS2SignatureAlgorithm.MD5WITHRSA);
        endpointConfiguration.setMdnMessageTemplate("Your AS2 message has been received");

        try (AS2Component as2Component = new AS2Component()) {
            as2Component.setCamelContext(camelContext);
            as2Component.setConfiguration(endpointConfiguration);
            return as2Component.createEndpoint(STR."as2://server/listen?serverPortNumber=11080&requestUriPattern=*");
        }
    }

}