};
void mdfour_begin(struct mdfour *md); // old: MD4Init
-void mdfour_update(struct mdfour *md, unsigned char *in, int n); //old: MD4Update
+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(unsigned char *out, unsigned char *in, int n);
+void mdfour(unsigned char *out, const unsigned char *in, int n);
#endif // _MDFOUR_H