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/*
* Secure Memory Buffers
* (C) 1999-2007,2012 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SECURE_MEMORY_BUFFERS_H_
#define BOTAN_SECURE_MEMORY_BUFFERS_H_
#include <botan/types.h> // IWYU pragma: export
#include <botan/mem_ops.h> // IWYU pragma: export
#include <vector> // IWYU pragma: export
#include <algorithm>
#include <deque>
#include <type_traits>
namespace Botan {
template<typename T>
class secure_allocator
{
public:
/*
* Assert exists to prevent someone from doing something that will
* probably crash anyway (like secure_vector<non_POD_t> where ~non_POD_t
* deletes a member pointer which was zeroed before it ran).
* MSVC in debug mode uses non-integral proxy types in container types
* like std::vector, thus we disable the check there.
*/
#if !defined(_ITERATOR_DEBUG_LEVEL) || _ITERATOR_DEBUG_LEVEL == 0
static_assert(std::is_integral<T>::value, "secure_allocator supports only integer types");
#endif
typedef T value_type;
typedef std::size_t size_type;
secure_allocator() noexcept = default;
secure_allocator(const secure_allocator&) noexcept = default;
secure_allocator& operator=(const secure_allocator&) noexcept = default;
~secure_allocator() noexcept = default;
template<typename U>
secure_allocator(const secure_allocator<U>&) noexcept {}
T* allocate(std::size_t n)
{
return static_cast<T*>(allocate_memory(n, sizeof(T)));
}
void deallocate(T* p, std::size_t n)
{
deallocate_memory(p, n, sizeof(T));
}
};
template<typename T, typename U> inline bool
operator==(const secure_allocator<T>&, const secure_allocator<U>&)
{ return true; }
template<typename T, typename U> inline bool
operator!=(const secure_allocator<T>&, const secure_allocator<U>&)
{ return false; }
template<typename T> using secure_vector = std::vector<T, secure_allocator<T>>;
template<typename T> using secure_deque = std::deque<T, secure_allocator<T>>;
// For better compatibility with 1.10 API
template<typename T> using SecureVector = secure_vector<T>;
template<typename T>
std::vector<T> unlock(const secure_vector<T>& in)
{
return std::vector<T>(in.begin(), in.end());
}
template<typename T, typename Alloc, typename Alloc2>
std::vector<T, Alloc>&
operator+=(std::vector<T, Alloc>& out,
const std::vector<T, Alloc2>& in)
{
out.reserve(out.size() + in.size());
out.insert(out.end(), in.begin(), in.end());
return out;
}
template<typename T, typename Alloc>
std::vector<T, Alloc>& operator+=(std::vector<T, Alloc>& out, T in)
{
out.push_back(in);
return out;
}
template<typename T, typename Alloc, typename L>
std::vector<T, Alloc>& operator+=(std::vector<T, Alloc>& out,
const std::pair<const T*, L>& in)
{
out.reserve(out.size() + in.second);
out.insert(out.end(), in.first, in.first + in.second);
return out;
}
template<typename T, typename Alloc, typename L>
std::vector<T, Alloc>& operator+=(std::vector<T, Alloc>& out,
const std::pair<T*, L>& in)
{
out.reserve(out.size() + in.second);
out.insert(out.end(), in.first, in.first + in.second);
return out;
}
/**
* Zeroise the values; length remains unchanged
* @param vec the vector to zeroise
*/
template<typename T, typename Alloc>
void zeroise(std::vector<T, Alloc>& vec)
{
clear_mem(vec.data(), vec.size());
}
/**
* Zeroise the values then free the memory
* @param vec the vector to zeroise and free
*/
template<typename T, typename Alloc>
void zap(std::vector<T, Alloc>& vec)
{
zeroise(vec);
vec.clear();
vec.shrink_to_fit();
}
}
#endif
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