sshsk_load_resident
if ((r = sshsk_load_resident(skprovider, NULL, pass, 0,
if ((r = sshsk_load_resident(skprovider, device, pin, 0,
if ((r = sshsk_load_resident(provider, device, pin, flags,
int sshsk_load_resident(const char *provider_path, const char *device,