124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2012 The Bitcoin developers
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// Copyright (c) 2011-2012 Litecoin Developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_ALLOCATORS_H
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#define BITCOIN_ALLOCATORS_H
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#include <string.h>
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#include <string>
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#ifdef WIN32
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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#define _WIN32_WINNT 0x0501
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#define WIN32_LEAN_AND_MEAN 1
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <windows.h>
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// This is used to attempt to keep keying material out of swap
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// Note that VirtualLock does not provide this as a guarantee on Windows,
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// but, in practice, memory that has been VirtualLock'd almost never gets written to
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// the pagefile except in rare circumstances where memory is extremely low.
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#define mlock(p, n) VirtualLock((p), (n));
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#define munlock(p, n) VirtualUnlock((p), (n));
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#else
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#include <sys/mman.h>
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#include <limits.h>
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/* This comes from limits.h if it's not defined there set a sane default */
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#ifndef PAGESIZE
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#include <unistd.h>
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#define PAGESIZE sysconf(_SC_PAGESIZE)
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#endif
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#define mlock(a,b) \
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mlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\
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(((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1))))
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#define munlock(a,b) \
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munlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\
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(((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1))))
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#endif
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//
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// Allocator that locks its contents from being paged
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// out of memory and clears its contents before deletion.
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//
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template<typename T>
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struct secure_allocator : public std::allocator<T>
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{
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// MSVC8 default copy constructor is broken
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typedef std::allocator<T> base;
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typedef typename base::size_type size_type;
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typedef typename base::difference_type difference_type;
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typedef typename base::pointer pointer;
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typedef typename base::const_pointer const_pointer;
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typedef typename base::reference reference;
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typedef typename base::const_reference const_reference;
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typedef typename base::value_type value_type;
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secure_allocator() throw() {}
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secure_allocator(const secure_allocator& a) throw() : base(a) {}
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template <typename U>
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secure_allocator(const secure_allocator<U>& a) throw() : base(a) {}
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~secure_allocator() throw() {}
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template<typename _Other> struct rebind
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{ typedef secure_allocator<_Other> other; };
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T* allocate(std::size_t n, const void *hint = 0)
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{
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T *p;
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p = std::allocator<T>::allocate(n, hint);
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if (p != NULL)
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mlock(p, sizeof(T) * n);
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return p;
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}
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void deallocate(T* p, std::size_t n)
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{
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if (p != NULL)
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{
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memset(p, 0, sizeof(T) * n);
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munlock(p, sizeof(T) * n);
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}
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std::allocator<T>::deallocate(p, n);
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}
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};
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//
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// Allocator that clears its contents before deletion.
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//
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template<typename T>
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struct zero_after_free_allocator : public std::allocator<T>
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{
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// MSVC8 default copy constructor is broken
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typedef std::allocator<T> base;
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typedef typename base::size_type size_type;
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typedef typename base::difference_type difference_type;
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typedef typename base::pointer pointer;
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typedef typename base::const_pointer const_pointer;
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typedef typename base::reference reference;
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typedef typename base::const_reference const_reference;
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typedef typename base::value_type value_type;
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zero_after_free_allocator() throw() {}
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zero_after_free_allocator(const zero_after_free_allocator& a) throw() : base(a) {}
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template <typename U>
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zero_after_free_allocator(const zero_after_free_allocator<U>& a) throw() : base(a) {}
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~zero_after_free_allocator() throw() {}
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template<typename _Other> struct rebind
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{ typedef zero_after_free_allocator<_Other> other; };
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void deallocate(T* p, std::size_t n)
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{
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if (p != NULL)
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memset(p, 0, sizeof(T) * n);
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std::allocator<T>::deallocate(p, n);
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}
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};
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// This is exactly like std::string, but with a custom allocator.
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typedef std::basic_string<char, std::char_traits<char>, secure_allocator<char> > SecureString;
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#endif
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