extern void big_key_destroy(struct key *key);
extern void big_key_describe(const struct key *big_key, struct seq_file *m);
extern long big_key_read(const struct key *key, char *buffer, size_t buflen);
+extern int big_key_update(struct key *key, struct key_preparsed_payload *prep);
#endif /* _KEYS_BIG_KEY_TYPE_H */