SSL_get_peer_signature_nid
if (SSL_get_peer_signature_nid(s, &nid))
if (SSL_get_peer_signature_nid(s, &nid) && nid != NID_undef)
SSL_get_peer_signature_nid(client.ssl, &ret->server_sign_hash);
SSL_get_peer_signature_nid(server.ssl, &ret->client_sign_hash);
if (SSL_get_peer_signature_nid(c_ssl, &mdnid))