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

[Hai-May Chao]

On Mon, 27 Oct 2025 02:40:39 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

>> 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
>
> src/java.base/share/classes/sun/security/util/Hybrid.java line 230:
> 
>> 228:             }
>> 229: 
>> 230:             throw new InvalidKeySpecException(keySpec.toString());
> 
> Please check null keySpec, and  `throw new InvalidKeySpecException("keySpec must not be null")`.
> 
> For non-null keySpec, I may use:
> `throw new InvalidKeySpecException(keySpec.getClass().getName() + " not supported.");
> `

Added null `keySpec` check, and updated `InvalidKeySpecException` message.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27614#discussion_r2505711695