Botan
2.1.0
Crypto and TLS for C++11
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src
lib
utils
mem_ops.cpp
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/*
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* Memory Scrubbing
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* (C) 2012,2015,2016 Jack Lloyd
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*
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* Botan is released under the Simplified BSD License (see license.txt)
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*/
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#include <botan/mem_ops.h>
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#if defined(BOTAN_TARGET_OS_HAS_RTLSECUREZEROMEMORY)
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#define NOMINMAX 1
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#include <windows.h>
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#endif
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namespace
Botan
{
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void
secure_scrub_memory
(
void
* ptr,
size_t
n)
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{
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#if defined(BOTAN_TARGET_OS_HAS_RTLSECUREZEROMEMORY)
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::RtlSecureZeroMemory(ptr, n);
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#elif defined(BOTAN_USE_VOLATILE_MEMSET_FOR_ZERO) && (BOTAN_USE_VOLATILE_MEMSET_FOR_ZERO == 1)
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/*
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Call memset through a static volatile pointer, which the compiler
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should not elide. This construct should be safe in conforming
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compilers, but who knows. I did confirm that on x86-64 GCC 6.1 and
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Clang 3.8 both create code that saves the memset address in the
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data segment and uncondtionally loads and jumps to that address.
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*/
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static
void
* (*
const
volatile
memset_ptr)(
void
*,
int
,
size_t
) = std::memset;
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(memset_ptr)(ptr, 0, n);
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#else
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volatile
uint8_t* p =
reinterpret_cast<
volatile
uint8_t*
>
(ptr);
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for
(
size_t
i = 0; i != n; ++i)
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p[i] = 0;
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#endif
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}
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}
Botan::secure_scrub_memory
void secure_scrub_memory(void *ptr, size_t n)
Definition:
mem_ops.cpp:17
Botan
Definition:
alg_id.cpp:13
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