CBE crypt interface

Hello Genodians

We are implementing hardware accelerated encryption for the CBE and have a question pertaining to this:

How should the Cbe_crypto::Interface be implemented when the underlying hardware is asynchronous, e.g. driven by interrupts?

I think I understand the semantics of submit_encryption_request and encryption_request_complete but this mechanism doesn't seem to help with asynchronous completion. As far as I can tell, no signals are used with the Cbe_crypto::Interface.

What am I missing?

Best regards Stefan