-extern bool digest_open_by_name(struct digest *, const char *);
-extern bool digest_open_by_nid(struct digest *, int);
-extern bool digest_open_sha1(struct digest *);
+extern bool digest_open_by_name(struct digest *, const char *name, int maclength);
+extern bool digest_open_by_nid(struct digest *, int nid, int maclength);
+extern bool digest_open_sha1(struct digest *, int maclength);