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51 lines
1.8 KiB
51 lines
1.8 KiB
/*
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* Copyright (C) 2019 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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#pragma once
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#include <stdint.h>
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#include <vector>
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namespace aidl {
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namespace android {
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namespace hardware {
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namespace rebootescrow {
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namespace hadamard {
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constexpr auto BYTE_LENGTH = 8u;
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constexpr auto CODEWORD_BYTES = 2u; // uint16_t
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constexpr auto CODEWORD_BITS = CODEWORD_BYTES * BYTE_LENGTH;
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constexpr uint32_t CODE_K = CODEWORD_BITS - 1;
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constexpr uint32_t ENCODE_LENGTH = 1u << CODE_K;
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constexpr auto KEY_CODEWORD_BYTES = 2u; // uint16_t (after transpose)
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constexpr auto KEY_CODEWORDS = KEY_CODEWORD_BYTES * BYTE_LENGTH;
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constexpr auto KEY_SIZE_IN_BYTES = KEY_CODEWORDS * CODEWORD_BYTES;
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constexpr auto OUTPUT_SIZE_BYTES = ENCODE_LENGTH * KEY_CODEWORD_BYTES;
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// Encodes a key that has a size of KEY_SIZE_IN_BYTES. Returns a byte array representation of the
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// encoded bitset. So a 32 bytes key will expand to 16*(2^15) bits = 64KiB.
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std::vector<uint8_t> EncodeKey(const std::vector<uint8_t>& input);
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// Given a byte array representation of the encoded keys, decodes it and return the result.
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std::vector<uint8_t> DecodeKey(const std::vector<uint8_t>& encoded);
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} // namespace hadamard
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} // namespace rebootescrow
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} // namespace hardware
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} // namespace android
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} // namespace aidl
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