Regarding engine implementation for RSA and AES

[Mahendra SP]

Hi,

We are looking at implementing an engine for RSA and AES.

For AES, looking at the documentation, understand that engine will get
invoked only if the application or SSL library invokes EVP based calls
rather than native AES calls. Is this correct ?

For RSA, is it mandatory to use EVP for using engine ?

Openssl version dependency:
Is it a must to use latest openssl version for engine ? Reason for this
question is, looking at 1.1.X code, all the calls are modified to EVP in
SSL library when compared to previous versions. As understanding is, engine
works with EVP, wanted to know if we need to use latest version.

Thanks
Mahendra
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