[gnutls-devel] GnuTLS | pk: implement deterministic ECDSA/DSA for provable signing (!1051)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/crypto-backend.h: https://gitlab.com/gnutls/gnutls/merge_requests/1051#note_200055390

>  	int (*sign) (gnutls_pk_algorithm_t, gnutls_datum_t * signature,
>  		     const gnutls_datum_t * data,
>  		     const gnutls_pk_params_st *priv,
> -		     const gnutls_x509_spki_st *sign);
> +		     const gnutls_x509_spki_st *sign,
> +		     unsigned int flags);

In RSA-PSS signatures `gnutls_privkey_sign_data` via `_gnutls_privkey_update_spki_params` does something similar for reproducible signatures by updating `gnutls_x509_spki_st`. 

I'd go for consistency in both cases; a documented flag parameter is fine as well.

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