Use constant time memcmp() when comparing packet HMACs.

[tinc] / src / utils.h

diff --git a/src/utils.h b/src/utils.h
index 2e4fcf8..7ab29d2 100644 (file)
--- a/src/utils.h
+++ b/src/utils.h
@@ -42,4 +42,6 @@ extern const char *winerror(int);
 
 extern unsigned int bitfield_to_int(const void *bitfield, size_t size);
 
+int memcmp_constant_time (const void *a, const void *b, size_t size);
+
 #endif                                                 /* __TINC_UTILS_H__ */