sshkey_private_serialize
if ((r = sshkey_private_serialize(key, kbuf)) != 0) {
if ((r = sshkey_private_serialize(key, kbuf)) != 0)
if ((r = sshkey_private_serialize(srks[i]->key, kbuf)) != 0)
if ((r = sshkey_private_serialize(key, buf)) != 0)
(r = sshkey_private_serialize(sensitive_data.host_keys[i],
int sshkey_private_serialize(struct sshkey *key, struct sshbuf *buf);