RFR: 8357466: Create test for Ciphers that are using ByteBuffers backed by MemorySegments [v2]

[Matthew Donovan]

On Tue, 2 Sep 2025 12:38:57 GMT, Matthew Donovan <mdonovan at openjdk.org> wrote:

>> This PR extends security tests to use ByteBuffers backed by MemorySegments. Tests in the areas of Signature, Cipher, MessageDigest, and Mac are updated.
>
> Matthew Donovan has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - addressed PR comments and refactored to use try-with-resources
>  - Merge branch 'master' into cipher-ffm
>  - 8357466: Create test for Ciphers that are using ByteBuffers backed by MemorySegments

> There is a recent bug fix at #27081 when a slice of an array-based buffer is used. Can you investigate why it has not been caught by this test? Should it be enhanced? Thanks.

There are a lot of tests under `test/jdk/com/sun/crypto/provider` that I didn't look at. There are some that explicitly test ByteBuffers (such as `Cipher/AEAD/OverlapByteBuffer.java`) and others that could possibly be extended to include them. I think updating all the tests would be unnecessary but I can update the tests that explicitly use  ByteBuffer.

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PR Comment: https://git.openjdk.org/jdk/pull/26967#issuecomment-3258867557