RFR: 8368984: Extra slashes in Cipher transformation leads to NSPE instead of NSAE [v2]

[Valerie Peng]

On Mon, 6 Oct 2025 19:48:48 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> There are quite a few values being updated here, that's why I didn't make it into a method initially. Let me think about it more...
>
> Both `sha512Idx` and `sha512SlashIdx` locally assigned, `SHA512TRUNCATED` is a constant, `transformation` is not mutated.

I did refactoring it using a record. If we apply the same method on mode as well, then the flow is simplified even though the mode should not contain truncated algorithms.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27615#discussion_r2409062884