#ifndef __TINC_UTILS_H__
#define __TINC_UTILS_H__
-extern int hex2bin(char *src, char *dst, int length);
-extern int bin2hex(char *src, char *dst, int length);
+extern int hex2bin(const char *src, char *dst, int length);
+extern int bin2hex(const char *src, char *dst, int length);
-extern int b64encode(char *src, char *dst, int length);
-extern int b64decode(char *src, char *dst, int length);
+extern int b64encode(const char *src, char *dst, int length);
+extern int b64decode(const char *src, char *dst, int length);
#ifdef HAVE_MINGW
extern const char *winerror(int);