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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_ENCRYPTION_H_
#define ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_ENCRYPTION_H_
#include <stdint.h>
#include <array>
#include <optional>
#include <string>
#include <vector>
#include "ash/quick_pair/fast_pair_handshake/fast_pair_key_pair.h"
namespace ash {
namespace quick_pair {
namespace fast_pair_encryption {
constexpr int kBlockSizeBytes = 16;
constexpr int kHmacSizeBytes = 32;
constexpr int kHmacKeySizeBytes = 64;
constexpr int kNonceSizeBytes = 8;
constexpr int kSecretKeySizeBytes = 16;
std::optional<KeyPair> GenerateKeysWithEcdhKeyAgreement(
const std::string& decoded_public_anti_spoofing);
const std::array<uint8_t, kBlockSizeBytes> EncryptBytes(
const std::array<uint8_t, kBlockSizeBytes>& aes_key_bytes,
const std::array<uint8_t, kBlockSizeBytes>& bytes_to_encrypt);
const std::array<uint8_t, kHmacSizeBytes> GenerateHmacSha256(
const std::array<uint8_t, kSecretKeySizeBytes>& secret_key,
std::array<uint8_t, kNonceSizeBytes> nonce,
const std::vector<uint8_t>& data);
// Encrypts `data` according to the Fast Pair Spec implementation of AES-CTR:
// https://developers.google.com/nearby/fast-pair/specifications/characteristics#AdditionalData.
// Notably used to encrypt data written to the GATT Additional Data
// characteristic.
const std::vector<uint8_t> EncryptAdditionalData(
const std::array<uint8_t, kSecretKeySizeBytes>& secret_key,
std::array<uint8_t, kNonceSizeBytes> nonce,
const std::vector<uint8_t>& data);
} // namespace fast_pair_encryption
} // namespace quick_pair
} // namespace ash
#endif // ASH_QUICK_PAIR_FAST_PAIR_HANDSHAKE_FAST_PAIR_ENCRYPTION_H_
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