ns_tsig_key
typedef struct ns_tsig_key ns_tsig_key;
int res_nupdate(res_state, ns_updrec *, ns_tsig_key *);
int res_sendsigned(const u_char *, int, ns_tsig_key *,
ns_tsig_key *, u_char *, int);
res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
res_nupdate(res_state statp, ns_updrec *rrecp_in, ns_tsig_key *key) {