[gnutls-devel] GnuTLS | handshake: defer setting downgrade sentinel until version is selected (!918)

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion on lib/handshake.c:

>  
>  	_gnutls_handshake_log("HSK[%p]: Selected version %s\n", session, session->security_parameters.pversion->name);
>  
> +	/* set downgrade sentinel if the server supports TLS 1.3 and

OK, so I ended up with regenerating server random upon handling "supported_versions" extension - that could effectively delay the setting of downgrade sentinel.

Also modified `rnd-check-rollback-val.c` to cover the resumption case.

Thank you for the suggestions.

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