64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_VOLD_KEYBUFFER_H
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#define ANDROID_VOLD_KEYBUFFER_H
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#include <cstring>
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#include <memory>
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#include <vector>
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namespace android {
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namespace vold {
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/**
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* Variant of memset() that should never be optimized away. Borrowed from keymaster code.
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*/
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#ifdef __clang__
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#define OPTNONE __attribute__((optnone))
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#else // not __clang__
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#define OPTNONE __attribute__((optimize("O0")))
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#endif // not __clang__
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inline OPTNONE void* memset_s(void* s, int c, size_t n) {
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if (!s)
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return s;
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return memset(s, c, n);
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}
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#undef OPTNONE
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// Allocator that delegates useful work to standard one but zeroes data before deallocating.
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class ZeroingAllocator : public std::allocator<char> {
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public:
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void deallocate(pointer p, size_type n)
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{
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memset_s(p, 0, n);
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std::allocator<char>::deallocate(p, n);
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}
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};
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// Char vector that zeroes memory when deallocating.
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using KeyBuffer = std::vector<char, ZeroingAllocator>;
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// Convenience methods to concatenate key buffers.
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KeyBuffer operator+(KeyBuffer&& lhs, const KeyBuffer& rhs);
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KeyBuffer operator+(KeyBuffer&& lhs, const char* rhs);
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} // namespace vold
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} // namespace android
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#endif
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