[8] Code review request for 6263419: No way to clean the memory for a java.security.Key

[Vincent Ryan]

Hello,

Please review the fix for 6263419. It introduces a mechanism to destroy
the sensitive data associated with private keys and secret keys. It is
a component of the JEP-166 delivery.

Webrev: http://cr.openjdk.java.net/~vinnie/6263419/webrev.00/

Implementers of JCE security providers can override the default method
implementations in the Destroyable interface to allow applications to
take advantage of this new facility. We intend to update our key
implementation classes soon.

Thanks.