RFR 8177784 Use CounterMode intrinsic for AES/GCM

[Chris Hegarty]

On 06/04/17 21:39, Anthony Scarpino wrote:
>
> I'd like to get a review for this performance change to use the existing
> CounterMode parallelized intrinsic instead of GCTR's own version. The
> two classes were nearly identical except for the doFinal() method which
> doesn't belong in CounterMode.java.
>
> I could have been more aggressive with this change, but I'm looking to
> get this into 9, so I stayed away from completely merging GCTR into
> CounterMode in case of incompatibilities.  All tests security and
> hotspot tests pass.
>
> http://cr.openjdk.java.net/~ascarpino/8177784/webrev/

This change looks good to me. Trivially, the class-level comment in
GCTR should be updated ( it refers to removed fields ). Also,
CounterMode.counter could be protected ( rather than package-private ).

-Chris.