[core] SecureZeroMemory() on _WIN32

src/safe_memclear.c

@@ -4,7 +4,16 @@
 
 #include <string.h>
 
-#if !defined(HAVE_MEMSET_S) && !defined(HAVE_EXPLICIT_BZERO) && !defined(HAVE_EXPLICIT_MEMSET)
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#include <WinBase.h>
+/*(Windows XP and later provide SecureZeroMemory())*/
+#define HAVE_SECUREZEROMEMORY
+#endif
+
+#if !defined(HAVE_MEMSET_S) \
+ && !defined(HAVE_EXPLICIT_BZERO) \
+ && !defined(HAVE_EXPLICIT_MEMSET) \
+ && !defined(HAVE_SECUREZEROMEMORY)
 
 #  if defined(HAVE_WEAK_SYMBOLS)
 /* it seems weak functions are never inlined, even for static builds */
@@ -33,7 +42,8 @@ static void* safe_memset(void *s, int c, size_t n)
 
 	return s;
 }
-#endif /* !defined(HAVE_MEMSET_S) && !defined(HAVE_EXPLICIT_BZERO) */
+
+#endif
 
 
 void safe_memclear(void *s, size_t n) {
@@ -43,6 +53,8 @@ void safe_memclear(void *s, size_t n) {
 	explicit_bzero(s, n);
 #elif defined(HAVE_EXPLICIT_MEMSET)
 	explicit_memset(s, 0, n);
+#elif defined(HAVE_SECUREZEROMEMORY)
+	SecureZeroMemory(s, n);
 #else
 	safe_memset(s, 0, n);
 #endif