RFR: 8314323: Implement JEP 527: TLS 1.3 Hybrid Key Exchange [v9]

[Weijun Wang]

On Mon, 24 Nov 2025 07:51:40 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 three additional commits since the last revision:
> 
>  - Update names to uppercase
>  - Remove fallback in engineGeneratePublic
>  - Change default named group list to have only X25519MLKEM768

src/java.base/share/classes/sun/security/ssl/NamedGroup.java line 232:

> 230:             NamedGroupSpec.NAMED_GROUP_KEM,
> 231:             ProtocolVersion.PROTOCOLS_OF_13,
> 232:             null),

I know the 3 name groups are not used yet, but the name here will be used in the constructor with `KeyFactory.getInstance(name)` and "MLKEM768" is not a standard name. Either use the standard name or do some translation.

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

PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2557258658