using constant time memcmp by C.Meessen

include/pcp/config.h.in

@@ -160,9 +160,6 @@
    */
 #undef LT_OBJDIR
 
-/* Define to 1 if your C compiler doesn't accept -c and -o together. */
-#undef NO_MINUS_C_MINUS_O
-
 /* Name of package */
 #undef PACKAGE
 

include/pcp/util.h

@@ -115,6 +115,14 @@ char *_bin2hex(byte *bin, size_t len);
 */
 size_t _hex2bin(const char *hex_str, unsigned char *byte_array, size_t byte_array_max);
 
+/** compare two memory regions in a constant time
+    \param[in] m1 array1
+    \param[in] m2 array2
+    \param[in] n size in bytes to compare
+    \return 0 if m1 and m2 are equal up to n
+ */
+int cst_time_memcmp(const void *m1, const void *m2, size_t n);
+
 #endif /*  _HAVE_PCP_UTIL_H */
 
 /**@}*/