>> ... "synthetic" implementation, which would turn to kernel
>> only when it actually pays off to do so and rely on user-land
>> software implementation otherwise.
> 
> Just to make sure I understand what you are saying.
> 
> Would this implementation do something like applying some rules to
> the requested operation, based on the parameters passed, and then
> decide whether to use the S&ST HW, or the OpenSSL SW function?

Yes.

> For
> the performance reasons you listed, I have been thinking about doing
> something along those lines.

Good.

> Is there an good reference example for this type of implementation?

Unfortunately no. A.

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