[gnutls-devel] GnuTLS | WIP: Add support for CNT_IMIT TLS 1.2 GOST cipher suite (!920)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos started a new discussion on lib/crypto-backend.h:

>  	gnutls_mac_output_func output;
>  	gnutls_mac_deinit_func deinit;
>  	gnutls_mac_fast_func fast;
> +	gnutls_mac_copy_func copy;

That's tricky because we cannot rely for it in general. The optimized ciphers in lib/accelerated do not support it, and any registered optimizations with `gnutls_crypto_register_cipher` or `gnutls_crypto_single_cipher_register`, will not work either.

In the past the `*_cipher_register` functions have prevented a lot of optimizations and make fixes like #503 hard to impossible. Maybe we should consider marking that API deprecated during 3.6.x lifetime, and make it a no-op in 3.7.0? That would allow bringing such optimizations.

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