-extern int default_keylen __P((int, int));
-extern int check_keylen __P((int, int, int));
-extern int algtype2doi __P((int, int));
-extern int algclass2doi __P((int));
+extern int default_keylen (int, int);
+extern int check_keylen (int, int, int);
+extern int algtype2doi (int, int);
+extern int algclass2doi (int);
+
+extern const char *alg_oakley_encdef_name (int);
+extern const char *alg_oakley_hashdef_name (int);
+extern const char *alg_oakley_dhdef_name (int);
+extern const char *alg_oakley_authdef_name (int);