1 /* 2 * Copyright 2017 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #if defined(WEBRTC_WIN) 12 #include <windows.h> 13 #else 14 #include <string.h> 15 #endif 16 17 #include "rtc_base/checks.h" 18 #include "rtc_base/zero_memory.h" 19 20 namespace rtc { 21 22 // Code and comment taken from "OPENSSL_cleanse" of BoringSSL. ExplicitZeroMemory(void * ptr,size_t len)23void ExplicitZeroMemory(void* ptr, size_t len) { 24 RTC_DCHECK(ptr || !len); 25 #if defined(WEBRTC_WIN) 26 SecureZeroMemory(ptr, len); 27 #else 28 memset(ptr, 0, len); 29 #if !defined(__pnacl__) 30 /* As best as we can tell, this is sufficient to break any optimisations that 31 might try to eliminate "superfluous" memsets. If there's an easy way to 32 detect memset_s, it would be better to use that. */ 33 __asm__ __volatile__("" : : "r"(ptr) : "memory"); // NOLINT 34 #endif 35 #endif // !WEBRTC_WIN 36 } 37 38 } // namespace rtc 39