-void mdfour_begin(struct mdfour *md); // old: MD4Init
-void mdfour_update(struct mdfour *md, const unsigned char *in, int n); //old: MD4Update
-void mdfour_result(struct mdfour *md, unsigned char *out); // old: MD4Final
+void mdfour_begin(struct mdfour_s *md); // old: MD4Init
+void mdfour_update(struct mdfour_s *md, const unsigned char *in, int n); //old: MD4Update
+void mdfour_result(struct mdfour_s *md, unsigned char *out); // old: MD4Final