8365820: Apply certificate scope constraints to algorithms in "signature_algorithms" extension when "signature_algorithms_cert" extension is not being sent

[artur-oracle]

JDK-8349583 implementation assumes that OpenJDK client always sends "signature_algorithms_cert" extension together with "signature_algorithms" extension. But we didn't account for jdk.tls.client.disableExtensions and jdk.tls.server.disableExtensions system properties which can disable producing "signature_algorithms_cert" extension. This is an issue similar to JDK-8355779 but on the extension producing side.

Per TLSv1.3 RFC:

If no "signature_algorithms_cert" extension is
present, then the "signature_algorithms" extension also applies to
signatures appearing in certificates.

Also making a few cosmetic changes to the existing code.

---

Progress

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Issue

• JDK-8365820: Apply certificate scope constraints to algorithms in "signature_algorithms" extension when "signature_algorithms_cert" extension is not being sent (Bug - P4)

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Webrevs

• 04: Full - Incremental (89867a60)
• 03: Full - Incremental (64fd6927)
• 02: Full - Incremental (c7f84138)
• 01: Full - Incremental (adc236be)
• 00: Full (e887f8a0)

[nibjen]

Can a usecase be added for jdk.tls.server.disableExtensions if this option is being considered.