Re: GnuTLS | nettle: support deriving ML-DSA public key from expanded secret key (!2088)

Daiki Ueno commented on a discussion on lib/nettle/pk.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/2088#note_3243318549

 >  		}
 >  		break;
 >  
 > +	case GNUTLS_PK_MLDSA44:
 > +	case GNUTLS_PK_MLDSA65:
 > +	case GNUTLS_PK_MLDSA87:
 > +		if (params->raw_pub.data == NULL) {
 > +			ret = ml_dsa_privkey_to_pubkey(algo, &params->raw_priv,
 > +						       &params->raw_pub);
 > +			if (ret < 0 && ret != GNUTLS_E_UNIMPLEMENTED_FEATURE)

Yes, that is intentional. Since `pk_fixup` is called upon importing private key, failing here means to prevent subsequent operations with expanded-only ML-DSA private keys. I added a debug log there.

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