RFR: 8325448: Hybrid Public Key Encryption [v41]

[Weijun Wang]

On Tue, 2 Sep 2025 16:54:18 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Implement HPKE as defined in https://datatracker.ietf.org/doc/rfc9180/.
>> 
>> <img alt="image" src="https://github.com/user-attachments/assets/1e25c4bc-63a9-41ae-81a9-3f644cf59ee3" />
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   cannot reset with withMethods

New commit pushed. The `with` methods can no longer be used to "reset" a field to its default value, for example, calling `withInfo(new byte[0])` to remove the non-default info or `withAuthKey(null)` to revert to `mode_base`.

Reasons:
1. Allowing a default value might hide unintended empty user input.
2. It's hard to manage all the fields in an `HPKEParameterSpec` object and reuse it back and forth.

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PR Comment: https://git.openjdk.org/jdk/pull/18411#issuecomment-3246128017