sshkey_save_private
int sshkey_save_private(struct sshkey *, const char *,
if ((r = sshkey_save_private(private, prv_tmp, "",
if ((r = sshkey_save_private(private, identity_file, passphrase1,
if ((r = sshkey_save_private(private, identity_file, passphrase,
if ((r = sshkey_save_private(key, path, pass,
if ((r = sshkey_save_private(private, identity_file, passphrase,