CMAC timings

[Hal Murray]

In general, things have slowed down.

The new EVP_MAC code takes 3 times as long as the old CMAC code on 1.1.1.
The new PKEY code takes twice as long as the old CMAC code on 1.1.1

The one ray of hope is that the API for EVP_MAC has split the part of the 
setup that uses the key out of the init routine.  If we can hang on to a ctx 
for each key, we can cut the time in half - that's new ECP_MAC vs CMAC on 1.1.1

So how much memory does a ctx take?  How can I find out?

Even if I can't allocate a ctx per key, I can at least keep one around from 
recv to send.   That makes the slowdown 1.7 instead of 3.

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Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz

# KL=key length, PL=packet length, CL=CMAC length

# OpenSSL 1.1.1g FIPS  21 Apr 2020

# CMAC        KL PL CL  ns/op sec/run
     AES-128  16 48 16    366   0.366  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16    381   0.381  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16    407   0.407  991f4017858de97515260dd9ae440b06

# PKEY        KL PL CL  ns/op sec/run
     AES-128  16 48 16    436   0.436  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16    448   0.448  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16    461   0.461  991f4017858de97515260dd9ae440b06

---------

# OpenSSL 3.0.0-alpha3 4 Jun 2020

# CMAC        KL PL CL  ns/op sec/run
     AES-128  16 48 16    973   0.973  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16    987   0.987  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16   1011   1.011  991f4017858de97515260dd9ae440b06

# PKEY        KL PL CL  ns/op sec/run
     AES-128  16 48 16    817   0.817  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16    824   0.824  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16    842   0.842  991f4017858de97515260dd9ae440b06

# EVP_MAC     KL PL CL  ns/op sec/run
     AES-128  16 48 16   1136   1.136  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16   1153   1.153  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16   1181   1.181  991f4017858de97515260dd9ae440b06

Preload cipher and key.
     AES-128  16 48 16    170   0.170  475ac1c053379e7dbd4ce80b87d2178e
     AES-192  24 48 16    182   0.182  c906422bfe0963de6df50e022b4aa7d4
     AES-256  32 48 16    196   0.196  991f4017858de97515260dd9ae440b06



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