2 * Copyright (C) 2017 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_VOLD_KEYBUFFER_H
18 #define ANDROID_VOLD_KEYBUFFER_H
28 * Variant of memset() that should never be optimized away. Borrowed from keymaster code.
31 #define OPTNONE __attribute__((optnone))
32 #else // not __clang__
33 #define OPTNONE __attribute__((optimize("O0")))
34 #endif // not __clang__
35 inline OPTNONE void* memset_s(void* s, int c, size_t n) {
38 return memset(s, c, n);
42 // Allocator that delegates useful work to standard one but zeroes data before deallocating.
43 class ZeroingAllocator : public std::allocator<char> {
45 void deallocate(pointer p, size_type n)
48 std::allocator<char>::deallocate(p, n);
52 // Char vector that zeroes memory when deallocating.
53 using KeyBuffer = std::vector<char, ZeroingAllocator>;
55 // Convenience methods to concatenate key buffers.
56 KeyBuffer operator+(KeyBuffer&& lhs, const KeyBuffer& rhs);
57 KeyBuffer operator+(KeyBuffer&& lhs, const char* rhs);
60 } // namespace android