RFR: 8314323: Implement JEP 527: TLS 1.3 Hybrid Key Exchange [v5]

[Artur Barashev]

On Tue, 14 Oct 2025 22:58:47 GMT, Hai-May Chao <hchao at openjdk.org> wrote:

>> Implement hybrid key exchange support for TLS 1.3 by adding three post-quantum hybrid named groups: X25519MLKEM768, SecP256r1MLKEM768, and SecP384r1MLKEM1024.
>> Please see [JEP 527](https://openjdk.org/jeps/527) for details about this change.
>
> Hai-May Chao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo in NamedGroup test

src/java.base/share/classes/sun/security/ssl/ServerHello.java line 583:

> 581:             // However, this is changed for KEM: the server (as encapsulator)
> 582:             // must perform both actions — derive the secret and generate the
> 583:             // encapsulated message at the same time during SHKeyShareProducer.

Nit: `during SHKeyShareProducer` doesn't seem gramatically correct, did you mean `during encapsulation in SHKeyShareProducer`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2430706063