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

[Weijun Wang]

On Tue, 2 Dec 2025 23:48:12 GMT, Deirdre Connolly <duke at openjdk.org> wrote:

>> 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 231:
> 
>> 229:     ML_KEM_1024(0x0202, "MLKEM1024",
>> 230:             NamedGroupSpec.NAMED_GROUP_KEM,
>> 231:             ProtocolVersion.PROTOCOLS_OF_13,
> 
> These are needed in general, should we write up a JEP to support them explicitly?

The current JEP does not cover them. Our plan is to support them in a future enhancement (not as big as a JEP).

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PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2583163312