sshkey_shield_private
if ((r = sshkey_shield_private(k)) != 0) {
(r = sshkey_shield_private(key)) != 0) {
if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
r = sshkey_shield_private(key);
r = sshkey_shield_private(key);
int sshkey_shield_private(struct sshkey *);