RFR: 8314323: TLS 1.3 Hybrid Key Exchange [v2]

[Artur Barashev]

On Sun, 5 Oct 2025 12:27:24 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:
> 
>   Updates with review comments

test/jdk/sun/security/ssl/CipherSuite/DisabledCurve.java line 31:

> 29:         DisabledCurve DISABLE_NONE PASS
> 30:  * @run main/othervm -Djdk.tls.namedGroups="secp384r1"
> 31:         DisabledCurve secp384r1 FAIL

This test case fails whether we specify `-Djdk.tls.namedGroups="secp384r1"` or not, because the test certificate also uses `secp384r1` algorithm in the signature.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2406492497