RFR: 8314323: Implement JEP 527: TLS 1.3 Hybrid Key Exchange [v6]

Mon Oct 27 02:57:06 UTC 2025

On Wed, 15 Oct 2025 06:48:50 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 two additional commits since the last revision:
> 
>  - Revert changes to UseStrongDHSizes test as ffdhe6144/8192 added back
>  - Updated comment in ServerHello and hybrid to upper-case in NamedGroup

test/jdk/java/security/spec/TestNamedParameterSpec.java line 44:

> 42:         "ML_DSA_44", "ML_DSA_65", "ML_DSA_87",
> 43:         "ML_KEM_512", "ML_KEM_768", "ML_KEM_1024",
> 44:         "X25519MLKEM768", "SecP256r1MLKEM768", "SecP384r1MLKEM1024",

Does it sound like an option to use the similar naming style like "ML_KEM_512" for the new names?  for example, X25519MLKEM768 -> X25519_ML_KEM_768

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PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2464308987