1*d9f75844SAndroid Build Coastguard Worker /* 2*d9f75844SAndroid Build Coastguard Worker * Copyright 2017 The WebRTC Project Authors. All rights reserved. 3*d9f75844SAndroid Build Coastguard Worker * 4*d9f75844SAndroid Build Coastguard Worker * Use of this source code is governed by a BSD-style license 5*d9f75844SAndroid Build Coastguard Worker * that can be found in the LICENSE file in the root of the source 6*d9f75844SAndroid Build Coastguard Worker * tree. An additional intellectual property rights grant can be found 7*d9f75844SAndroid Build Coastguard Worker * in the file PATENTS. All contributing project authors may 8*d9f75844SAndroid Build Coastguard Worker * be found in the AUTHORS file in the root of the source tree. 9*d9f75844SAndroid Build Coastguard Worker */ 10*d9f75844SAndroid Build Coastguard Worker 11*d9f75844SAndroid Build Coastguard Worker #if defined(WEBRTC_WIN) 12*d9f75844SAndroid Build Coastguard Worker #include <windows.h> 13*d9f75844SAndroid Build Coastguard Worker #else 14*d9f75844SAndroid Build Coastguard Worker #include <string.h> 15*d9f75844SAndroid Build Coastguard Worker #endif 16*d9f75844SAndroid Build Coastguard Worker 17*d9f75844SAndroid Build Coastguard Worker #include "rtc_base/checks.h" 18*d9f75844SAndroid Build Coastguard Worker #include "rtc_base/zero_memory.h" 19*d9f75844SAndroid Build Coastguard Worker 20*d9f75844SAndroid Build Coastguard Worker namespace rtc { 21*d9f75844SAndroid Build Coastguard Worker 22*d9f75844SAndroid Build Coastguard Worker // Code and comment taken from "OPENSSL_cleanse" of BoringSSL. ExplicitZeroMemory(void * ptr,size_t len)23*d9f75844SAndroid Build Coastguard Workervoid ExplicitZeroMemory(void* ptr, size_t len) { 24*d9f75844SAndroid Build Coastguard Worker RTC_DCHECK(ptr || !len); 25*d9f75844SAndroid Build Coastguard Worker #if defined(WEBRTC_WIN) 26*d9f75844SAndroid Build Coastguard Worker SecureZeroMemory(ptr, len); 27*d9f75844SAndroid Build Coastguard Worker #else 28*d9f75844SAndroid Build Coastguard Worker memset(ptr, 0, len); 29*d9f75844SAndroid Build Coastguard Worker #if !defined(__pnacl__) 30*d9f75844SAndroid Build Coastguard Worker /* As best as we can tell, this is sufficient to break any optimisations that 31*d9f75844SAndroid Build Coastguard Worker might try to eliminate "superfluous" memsets. If there's an easy way to 32*d9f75844SAndroid Build Coastguard Worker detect memset_s, it would be better to use that. */ 33*d9f75844SAndroid Build Coastguard Worker __asm__ __volatile__("" : : "r"(ptr) : "memory"); // NOLINT 34*d9f75844SAndroid Build Coastguard Worker #endif 35*d9f75844SAndroid Build Coastguard Worker #endif // !WEBRTC_WIN 36*d9f75844SAndroid Build Coastguard Worker } 37*d9f75844SAndroid Build Coastguard Worker 38*d9f75844SAndroid Build Coastguard Worker } // namespace rtc 39