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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdint.h>
#include <vector>
namespace aidl {
namespace android {
namespace hardware {
namespace rebootescrow {
namespace hadamard {
constexpr auto BYTE_LENGTH = 8u;
constexpr auto CODEWORD_BYTES = 2u; // uint16_t
constexpr auto CODEWORD_BITS = CODEWORD_BYTES * BYTE_LENGTH;
constexpr uint32_t CODE_K = CODEWORD_BITS - 1;
constexpr uint32_t ENCODE_LENGTH = 1u << CODE_K;
constexpr auto KEY_CODEWORD_BYTES = 2u; // uint16_t (after transpose)
constexpr auto KEY_CODEWORDS = KEY_CODEWORD_BYTES * BYTE_LENGTH;
constexpr auto KEY_SIZE_IN_BYTES = KEY_CODEWORDS * CODEWORD_BYTES;
constexpr auto OUTPUT_SIZE_BYTES = ENCODE_LENGTH * KEY_CODEWORD_BYTES;
// Encodes a key that has a size of KEY_SIZE_IN_BYTES. Returns a byte array representation of the
// encoded bitset. So a 32 bytes key will expand to 16*(2^15) bits = 64KiB.
std::vector<uint8_t> EncodeKey(const std::vector<uint8_t>& input);
// Given a byte array representation of the encoded keys, decodes it and return the result.
std::vector<uint8_t> DecodeKey(const std::vector<uint8_t>& encoded);
} // namespace hadamard
} // namespace rebootescrow
} // namespace hardware
} // namespace android
} // namespace aidl
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