[gnutls-devel] GnuTLS | Draft: key_share: allow key share reuse with hybrids (!2067)

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Daiki Ueno started a new discussion on lib/ext/key_share.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/2067#note_3088140139

 >  
 >  	case GNUTLS_PK_ECDH_X25519:
 >  	case GNUTLS_PK_ECDH_X448:
 > -		gnutls_pk_params_release(&session->key.kshare.ecdhx_params);
 > -		gnutls_pk_params_init(&session->key.kshare.ecdhx_params);
 > +		/* try reusing existing values */
 > +		if (session->key.kshare.ecdhx_params.curve == group->curve &&
 > +		    session->key.kshare.ecdhx_params.algo == group->pk &&
 > +		    session->key.kshare.ecdhx_params.raw_pub.data != NULL) {

The GNUTLS_PK_EC branch also needs this treatment for SecP256r1MLKEM768 etc., right? To make it easier to follow, I would rather make the entire logic in multiple passes: first determine which groups to send, dissect hybrids and uniquify standalones, generate key share for each standalone group, and finally combine them.

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