sshkey_to_blob
if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
r = sshkey_to_blob(kcopy, blob, blen);
if ((r = sshkey_to_blob(key, &key_blob, &key_bloblen)) != 0)
if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
(r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 ||
int sshkey_to_blob(const struct sshkey *, u_char **, size_t *);