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nearby/fastpair/handshake/fast_pair_data_encryptor.h
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2023-03-23 14:44:42 -07:00

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// Copyright 2022 Google LLC
//
// 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
//
// https://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.
#ifndef THIRD_PARTY_NEARBY_FASTPAIR_HANDSHAKE_FAST_PAIR_DATA_ENCRYPTOR_H_
#define THIRD_PARTY_NEARBY_FASTPAIR_HANDSHAKE_FAST_PAIR_DATA_ENCRYPTOR_H_
#include <stddef.h>
#include <stdint.h>
#include <array>
#include <functional>
#include <optional>
#include <vector>
#include "absl/functional/any_invocable.h"
#include "fastpair/common/constant.h"
#include "fastpair/crypto/decrypted_passkey.h"
#include "fastpair/crypto/decrypted_response.h"
namespace nearby {
namespace fastpair {
// Holds a secret key for a device and has methods to encrypt bytes, decrypt
// response and decrypt passkey.
class FastPairDataEncryptor {
public:
virtual ~FastPairDataEncryptor() = default;
// Encrypts bytes with the stored secret key.
virtual std::array<uint8_t, kAesBlockByteSize> EncryptBytes(
const std::array<uint8_t, kAesBlockByteSize>& bytes_to_encrypt) const = 0;
// Return stored PublicKey
virtual std::optional<std::array<uint8_t, 64>> GetPublicKey() const = 0;
// Decrypt and parse decrypted response bytes with the stored secret key.
virtual void ParseDecryptResponse(
const std::vector<uint8_t>& encrypted_response_bytes,
absl::AnyInvocable<void(const std::optional<DecryptedResponse>)>
callback) = 0;
// Decrypt and parse decrypted passkey bytes with the stored secret key.
virtual void ParseDecryptPasskey(
const std::vector<uint8_t>& encrypted_passkey_bytes,
absl::AnyInvocable<void(const std::optional<DecryptedPasskey>)>
callback) = 0;
};
} // namespace fastpair
} // namespace nearby
#endif // THIRD_PARTY_NEARBY_FASTPAIR_HANDSHAKE_FAST_PAIR_DATA_ENCRYPTOR_H_