-extern bool DesSetkey __P((u_char *));
-extern bool DesEncrypt __P((u_char *, u_char *));
-extern bool DesDecrypt __P((u_char *, u_char *));
+extern bool DesSetkey(u_char *);
+extern bool DesEncrypt(u_char *, u_char *);
+extern bool DesDecrypt(u_char *, u_char *);