Bitcoin ABC  0.26.3
P2P Digital Currency
zeroafterfree.h
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1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2015 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 
6 #ifndef BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
7 #define BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
8 
9 #include <support/cleanse.h>
10 
11 #include <memory>
12 #include <vector>
13 
14 template <typename T>
15 struct zero_after_free_allocator : public std::allocator<T> {
16  using base = std::allocator<T>;
17  using traits = std::allocator_traits<base>;
18  using size_type = typename traits::size_type;
19  using difference_type = typename traits::difference_type;
20  using pointer = typename traits::pointer;
21  using const_pointer = typename traits::const_pointer;
22  using value_type = typename traits::value_type;
25  : base(a) {}
26  template <typename U>
28  : base(a) {}
30  template <typename _Other> struct rebind {
32  };
33 
34  void deallocate(T *p, std::size_t n) {
35  if (p != nullptr) memory_cleanse(p, sizeof(T) * n);
36  std::allocator<T>::deallocate(p, n);
37  }
38 };
39 
41 using SerializeData = std::vector<uint8_t, zero_after_free_allocator<uint8_t>>;
42 
43 #endif // BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
void memory_cleanse(void *ptr, size_t len)
Secure overwrite a buffer (possibly containing secret data) with zero-bytes.
Definition: cleanse.cpp:14
zero_after_free_allocator< _Other > other
Definition: zeroafterfree.h:31
typename traits::difference_type difference_type
Definition: zeroafterfree.h:19
zero_after_free_allocator(const zero_after_free_allocator< U > &a) noexcept
Definition: zeroafterfree.h:27
std::allocator< T > base
Definition: zeroafterfree.h:16
void deallocate(T *p, std::size_t n)
Definition: zeroafterfree.h:34
std::allocator_traits< base > traits
Definition: zeroafterfree.h:17
typename traits::const_pointer const_pointer
Definition: zeroafterfree.h:21
zero_after_free_allocator() noexcept
Definition: zeroafterfree.h:23
typename traits::value_type value_type
Definition: zeroafterfree.h:22
~zero_after_free_allocator() noexcept
Definition: zeroafterfree.h:29
typename traits::pointer pointer
Definition: zeroafterfree.h:20
zero_after_free_allocator(const zero_after_free_allocator &a) noexcept
Definition: zeroafterfree.h:24
typename traits::size_type size_type
Definition: zeroafterfree.h:18
std::vector< uint8_t, zero_after_free_allocator< uint8_t > > SerializeData
Byte-vector that clears its contents before deletion.
Definition: zeroafterfree.h:41