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

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion on lib/crypto-backend.h: https://gitlab.com/gnutls/gnutls/merge_requests/1051#note_200585519

>  	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);

I realized that the current code is not correct when hash algorithm doesn't match the q parameter.  To support these exceptional cases we also need to propagate hash algorithm to `_wrap_nettle_pk_sign()`.

Maybe extending `gnutls_x509_spki_st` (or wrapping it in a new struct) would be simpler to implement it.

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