This command is used to test the performance of cryptographic algorithms.
OPTIONS
-engine id
specifying an engine (by it's unique id string) will cause speed
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
[zero or more test algorithms]
If any options are given, speed tests those algorithms, otherwise all of
the above are tested.
