Support for KMAC

[BrianSipos]

It would be convenient if this library directly supported the cSHAKE and KMAC algorithms from NIST SP 800-185. These algorithms are already implemented as part of PyCryptodome but having them in this library would enable some other synergistic uses within cryptography.

[alex]

We rely on OpenSSL for core cryptographic algorithms, are these available in OpenSSL?

[BrianSipos]

As of OpenSSL 3 there are EVP APIs for KMAC128 and KMAC256 with an example of use. Don't see a direct cSHAKE use in the API though.

I actually care more about being able to use KMAC than the underlying cSHAKE, so I'll update this ticket to clarify.