RFR: 8371864: GaloisCounterMode.implGCMCrypt0 AVX512/AVX2 intrinsics stubs cause AES-GCM encryption failure for certain payload sizes [v9]

[Shawn M Emery]

On Wed, 26 Nov 2025 23:09:19 GMT, Jiangli Zhou <jiangli at openjdk.org> wrote:

>> Please review the fix in StubGenerator::aesgcm_avx512 and StubGenerator::aesgcm_avx2 to handle some edge cases with input sizes that are not multiple of the block size. 
>> 
>> Thanks to Thomas Holenstein and Lukas Zobernig for analyzing the issue and providing the test case!
>
> Jiangli Zhou has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address @smemery's comments:
>   - Add @requires
>   - Shorten long lines

@jianglizhou thank you for the AVX2 related output from the unit test pre-fix.  From this I was able to trace the point of failure and see that your proposed changes are good for approval.  Thank you for your work on these issues!

-------------

Marked as reviewed by smemery at github.com (no known OpenJDK username).

PR Review: https://git.openjdk.org/jdk/pull/28363#pullrequestreview-3517602570