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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/mem_ops.h>
#include <algorithm>
#include <vector>
#include <deque>
#include <type_traits>
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
#include <botan/locking_allocator.h>
#endif
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 T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
secure_allocator() BOTAN_NOEXCEPT {}
template<typename U>
secure_allocator(const secure_allocator<U>&) BOTAN_NOEXCEPT {}
~secure_allocator() BOTAN_NOEXCEPT {}
pointer address(reference x) const BOTAN_NOEXCEPT
{ return std::addressof(x); }
const_pointer address(const_reference x) const BOTAN_NOEXCEPT
{ return std::addressof(x); }
pointer allocate(size_type n, const void* = 0)
{
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
if(pointer p = static_cast<pointer>(mlock_allocator::instance().allocate(n, sizeof(T))))
return p;
#endif
pointer p = new T[n];
clear_mem(p, n);
return p;
}
void deallocate(pointer p, size_type n)
{
secure_scrub_memory(p, n);
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
if(mlock_allocator::instance().deallocate(p, n, sizeof(T)))
return;
#endif
delete [] p;
}
size_type max_size() const BOTAN_NOEXCEPT
{
return static_cast<size_type>(-1) / sizeof(T);
}
template<typename U, typename... Args>
void construct(U* p, Args&&... args)
{
::new(static_cast<void*>(p)) U(std::forward<Args>(args)...);
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4100)
template<typename U> void destroy(U* p) { p->~U(); }
#pragma warning(pop)
#endif
};
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>>;
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)
{
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)
{
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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