cipher-chachapoly: use OpenSSL's implementation of Poly1305 #560
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OpenSSL starting in version 3.0.0 has a new EVP_MAC API which allows POLY1305 algorithm to be used as a standalone MAC. OpenSSL's implementation is significantly faster, so we should use it when it's available.
With this change on an Intel N5105 (Jasperlake), I observed a 26% speedup for the entire [email protected] cipher from 276MB/s to 350MB/s.