RFR: 8318756 Create better internal buffer for AEADs [v6]

[Anthony Scarpino]

On Wed, 6 Dec 2023 16:48:57 GMT, Anthony Scarpino <ascarpino at openjdk.org> wrote:

>> Hi,
>> 
>> I need a review for a new internal buffer class called AEADBufferStream.  AEADBufferStream extends ByteArrayOutputStream, but eliminates some data checking and copying that are not necessary for what GaloisCounterMode.java and ChaCha20Cipher.java need.  
>> 
>> The changes greatest benefit is with decryption operations.  ChaCha20-Poly1305 had larger performance gains by adopting similar techniques that AES/GCM already uses. 
>> 
>> The new buffer shows up to 21% bytes/sec performance increase for decryption for ChaCha20-Poly1305 and 12% for AES/GCM.  16K data sizes saw a memory usage reduction of 46% with and 83% with ChaCha20-Poly1305.  These results come from the JMH tests updated in this request and memory usage using the JMH gc profile gc.alloc.rate.norm entry
>> 
>> thanks
>> 
>> Tony
>
> Anthony Scarpino has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update

This change did not introduce the problem.  The test just exposed the problem that has existed since https://bugs.openjdk.org/browse/JDK-8247645 was integrated in JDK 20.

A bug was filed: https://bugs.openjdk.org/browse/JDK-8321542

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PR Comment: https://git.openjdk.org/jdk/pull/16487#issuecomment-1848083450