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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;
#ifdef BOTAN_BUILD_COMPILER_IS_MSVC_2013
secure_allocator() = default;
secure_allocator(const secure_allocator&) = default;
secure_allocator& operator=(const secure_allocator&) = default;
~secure_allocator() = default;
template <typename U>
struct rebind
{
typedef secure_allocator<U> other;
};
void construct(value_type* mem, const value_type& value)
{
std::_Construct(mem, value);
}
void destroy(value_type* mem)
{
std::_Destroy(mem);
}
#else
secure_allocator() BOTAN_NOEXCEPT = default;
secure_allocator(const secure_allocator&) BOTAN_NOEXCEPT = default;
secure_allocator& operator=(const secure_allocator&) BOTAN_NOEXCEPT = default;
~secure_allocator() BOTAN_NOEXCEPT = default;
#endif
template<typename U>
secure_allocator(const secure_allocator<U>&) BOTAN_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 compatability with 1.10 API
template<typename T> using SecureVector = secure_vector<T>;
template<typename T>
std::vector<T> unlock(const secure_vector<T>& in)
{
std::vector<T> out(in.size());
copy_mem(out.data(), in.data(), in.size());
return out;
}
template<typename T, typename Alloc>
size_t buffer_insert(std::vector<T, Alloc>& buf,
size_t buf_offset,
const T input[],
size_t input_length)
{
BOTAN_ASSERT_NOMSG(buf_offset <= buf.size());
const size_t to_copy = std::min(input_length, buf.size() - buf_offset);
if(to_copy > 0)
{
copy_mem(&buf[buf_offset], input, to_copy);
}
return to_copy;
}
template<typename T, typename Alloc, typename Alloc2>
size_t buffer_insert(std::vector<T, Alloc>& buf,
size_t buf_offset,
const std::vector<T, Alloc2>& input)
{
BOTAN_ASSERT_NOMSG(buf_offset <= buf.size());
const size_t to_copy = std::min(input.size(), buf.size() - buf_offset);
if(to_copy > 0)
{
copy_mem(&buf[buf_offset], input.data(), to_copy);
}
return to_copy;
}
template<typename T, typename Alloc, typename Alloc2>
std::vector<T, Alloc>&
operator+=(std::vector<T, Alloc>& out,
const std::vector<T, Alloc2>& in)
{
const size_t copy_offset = out.size();
out.resize(out.size() + in.size());
if(in.size() > 0)
{
copy_mem(&out[copy_offset], in.data(), in.size());
}
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)
{
const size_t copy_offset = out.size();
out.resize(out.size() + in.second);
if(in.second > 0)
{
copy_mem(&out[copy_offset], 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)
{
const size_t copy_offset = out.size();
out.resize(out.size() + in.second);
if(in.second > 0)
{
copy_mem(&out[copy_offset], 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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