sshkey_check_revoked
r = sshkey_check_revoked(key, options.revoked_keys_files[i]);
int sshkey_check_revoked(struct sshkey *key, const char *revoked_keys_file);
if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
r = sshkey_check_revoked(host_key,