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