// Copyright (c) 2017-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#pragma once
#ifdef __cplusplus
#include <array>
#include <cstddef>
extern "C" {
#endif
void *memwipe(void *src, size_t n);
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
namespace tools {
/// Scrubs data in the contained type upon destruction.
///
/// Primarily useful for making sure that private keys don't stick around in
/// memory after the objects that held them have gone out of scope.
template <class T>
struct scrubbed : public T {
using type = T;
~scrubbed() {
scrub();
}
/// Destroy the contents of the contained type.
void scrub() {
static_assert(std::is_pod<T>::value,
"T cannot be auto-scrubbed. T must be POD.");
static_assert(std::is_trivially_destructible<T>::value,
"T cannot be auto-scrubbed. T must be trivially destructable.");
memwipe(this, sizeof(T));
}
};
template<typename T>
T& unwrap(scrubbed<T>& src) { return src; }
template<typename T>
const T& unwrap(scrubbed<T> const& src) { return src; }
template <class T, size_t N>
using scrubbed_arr = scrubbed<std::array<T, N>>;
} // namespace tools
#endif // __cplusplus
