OpenSSL: ASYNC operations and application callback function.

[Narasimha Nayak]

Hello All,



I am investigating the usage of OpenSSL v1.1.1.c with QAT offload.

As part of the investigation to enable ASYNC mode for SSL ops I came across
the possibility of providing callbacks via “SSL_CTX_set_async_callback”,
and not use poll/select as required earlier.

The callback functionality has been added via commit (
https://github.com/openssl/openssl/commit/9f5a87fd665cb597fa1c1f4eef882d2d2f833e61)
in Nov, 2018.

These changes are not yet part of OpenSSL v1.1.1c/d.


Hence I would like to understand the following:

   1. Is this feature complete and use-able with QAT engine provided by
   Intel for OpenSSL ? Are there any drawbacks to be aware of ?
   2. Do we have any examples to depict the usage for these APIs ? Will
   help to know if there are any corner cases to handle.



Any feedback is much appreciated.



--

Thanks and Regards,

Narasimha
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