extern digest_t *digest_alloc(void) ATTR_MALLOC;
extern void digest_free(digest_t **digest);
extern void digest_close(digest_t *digest);
extern bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) ATTR_WARN_UNUSED;
extern bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const void *digestdata) ATTR_WARN_UNUSED;
extern bool digest_set_key(digest_t *digest, const void *key, size_t len) ATTR_WARN_UNUSED;
extern digest_t *digest_alloc(void) ATTR_MALLOC;
extern void digest_free(digest_t **digest);
extern void digest_close(digest_t *digest);
extern bool digest_create(digest_t *digest, const void *indata, size_t inlen, void *outdata) ATTR_WARN_UNUSED;
extern bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const void *digestdata) ATTR_WARN_UNUSED;
extern bool digest_set_key(digest_t *digest, const void *key, size_t len) ATTR_WARN_UNUSED;