getpublickey
int getpublickey(const char *, char *);
if (! getpublickey(servername, (char *) pkey_data)) {
if (! getpublickey(cred->adc_fullname.name, pkey_data)) {
if (!getpublickey(remote_name, xpublic)) {
if (nodefaultkeys || !getpublickey("nobody", xpublic))