RFR: 8368520: TLS 1.3 KeyUpdate fails with SunPKCS11 provider

[Valerie Peng]

On Thu, 25 Sep 2025 19:45:48 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> Change SunJSSE to use `TlsUpdateNplus1` instead of `AES` as the key algorithm when deriving the next application traffic secret.
> 
> SunPKCS11 provider checks the key length when creating an `AES` key, and since 384 bits is not a valid AES key length, the key creation fails.
> 
> `TlsUpdateNplus1` is [already recognized](https://github.com/openjdk/jdk/blob/3c9fd7688f4d73067db9b128c329ca7603a60578/src/jdk.crypto.cryptoki/share/classes/sun/security/pkcs11/P11SecretKeyFactory.java#L287) as a standard TLS generic key by SunPKCS11.
> 
> Key update is now exercised by the FipsModeTLS test. The test passes with the changes, fails without them. Other tier1-3 tests continue to pass.

src/java.base/share/classes/sun/security/ssl/SSLTrafficKeyDerivation.java line 215:

> 213:             if (this == TlsKey)
> 214:                 return cs.bulkCipher.algorithm;
> 215:             return algorithm;

nit: how about just `return (this == TlsKey ? cs.bulkCipher.algorithm : algorithm);`

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PR Review Comment: https://git.openjdk.org/jdk/pull/27498#discussion_r2388628833