RFR 8184744 : Replace finalizer in crypto classes with Cleaner

[Mandy Chung]

Thanks for doing this.  It’s good to see JDK finalizes being replaced.

It looks good to me.  I wonder if there is any existing security utility class that may be a good place for this zero-ing byte array method to share.  Sean and other may have opinion.

Mandy

> On Aug 3, 2017, at 1:01 PM, Roger Riggs <Roger.Riggs at oracle.com> wrote:
> 
> Found a race in the tests between the Cleaner clearing the arrays and the test waiting for the key to be freed.
> Revised to continuously check the arrays and exit when they are cleared.  If not cleared the test will timeout.
> 
> Updated the webrev:
>  http://cr.openjdk.java.net/~rriggs/webrev-crypt-finalize-8184744/
> 
> Thanks, Roger
> 
> On 8/3/2017 9:58 AM, Roger Riggs wrote:
>> Please review replacing finalize with java.lang.ref.Cleaner in a few simple cases.
>> 
>> Webrev:
>> http://cr.openjdk.java.net/~rriggs/webrev-crypt-finalize-8184744/
>> 
>> Thanks, Roger
>> 
>> 
>