[gnutls-devel] GnuTLS | Add GOST-CNT ciphersuite support (!1119)

[Development of GNU's TLS library]

Dmitry Eremin-Solenikov commented on a discussion on tests/tls13-server-kx-neg.c: https://gitlab.com/gnutls/gnutls/merge_requests/1119#note_243994597

> +	},
> +	{
> +		.name = "TLS 1.2 server TLS 1.3 client with cred and GOST-512 cert",
> +		.server_ret = 0,
> +		.client_ret = 0,
> +		.have_cert_cred = 1,
> +		.have_gost12_512_cert = 1,
> +		.not_on_fips = 1,
> +		.server_prio = "NORMAL:-KX-ALL:+VKO-GOST-12:" "-VERS-ALL:+VERS-TLS1.2",
> +		.client_prio = "NORMAL:-KX-ALL:+VKO-GOST-12:"PVERSION,
> +		.exp_version = GNUTLS_TLS1_2,
> +	},
> +	/* Ideally for the next two test cases we should fallback to TLS 1.2 + GOST
> +	 * but this is unsuppored for now */
> +	{
> +		.name = "TLS 1.3 server and client VKO-GOST-12 with cred and GOST-256 cert",

I have been thinking about this for quite some time. Just disabling TLS1.3 if GOST ciphersuite is enabled leads to lots of failures if/once GOST is a part of default setup. For now I've just failed to create a proper list of all possible setups and 'best' outcomes. I plan to return to that while actually implementing GOST TLS 1.3 support (which will use a completely different ciphersuite).

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