Code Review Requests for 8012900: CICO ignores AAD in GCM mode

[Valerie (Yu-Ching) Peng]

Xuelei,

Here is another GCM and CipherInputStream/CipherOutputStream related 
fix, i.e. for
8012900: CICO ignores AAD in GCM mode

The key changes are in CipherCore.java, GalorisCounterMode.java, the 
rest files only have minor changes.
Essentially, when using AES/GCM cipher in decryption mode, the data will 
be buffered and processed AFTER the tag has been verified. Otherwise, 
most of the recovered text would be returned even if tag verification 
failed later.
Given that CipherCore is shared by most modes, this particular buffering 
is done inside the GCM impl. But then some more methods have to be 
added/modified slightly so CipherCore will include this additional 
buffering from the underneath level in its output size calculations, etc.

The webrev is at: http://cr.openjdk.java.net/~valeriep/8012900/webrev.00/

Thanks,
Valerie