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https://github.com/kidfromjupiter/nearby.git
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100 lines
4.3 KiB
C++
100 lines
4.3 KiB
C++
// Copyright 2023 Google LLC
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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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// https://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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#ifndef THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_CONNECTION_AUTHENTICATOR_H_
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#define THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_CONNECTION_AUTHENTICATOR_H_
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "absl/strings/string_view.h"
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#include "internal/proto/credential.pb.h"
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#include "internal/proto/local_credential.pb.h"
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namespace nearby {
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namespace presence {
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class ConnectionAuthenticator {
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public:
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struct OneWayInitiatorData {
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std::string shared_credential_hash;
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};
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struct TwoWayInitiatorData {
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std::string shared_credential_hash;
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std::string private_key_signature;
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};
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struct ResponderData {
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std::string private_key_signature;
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};
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using InitiatorData = absl::variant<OneWayInitiatorData, TwoWayInitiatorData>;
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// Builds a signed message to be returned to Nearby Connections for
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// authentication on the other side of the connection.
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// ukey2_secret - The shared secret derived from the UKEY2 handshake in NC.
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// local_credential - The local credential used to sign the derived
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// information. If this is std::nullopt, then we will be
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// performing one-way authentication.
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// shared_credential - The shared credential used to decrypt the advertisement
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// from the remote device.
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absl::StatusOr<InitiatorData> BuildSignedMessageAsInitiator(
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absl::string_view ukey2_secret,
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std::optional<const internal::LocalCredential> local_credential,
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const internal::SharedCredential& shared_credential) const;
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// Builds a signed message to be returned to Nearby Connections for
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// authentication on the other side of the connection.
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// ukey2_secret - The shared secret derived from the UKEY2 handshake in NC.
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// local_credential - The local credential used to sign the derived
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// information so the initiator can verify against our
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// shared credential.
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absl::StatusOr<ResponderData> BuildSignedMessageAsResponder(
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absl::string_view ukey2_secret,
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const internal::LocalCredential& local_credential) const;
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// Verifies a signed message received from the responder (broadcaster) of the
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// Nearby Presence advertisement.
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// authentication_data - the data required to verify the connection, received
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// from the responder.
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// ukey2_secret - the shared secret derived from the ukey2 handshake in NC.
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// shared_credentials - the set of shared credentials that can be used to
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// verify the responder data.
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absl::Status VerifyMessageAsInitiator(
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ResponderData authentication_data, absl::string_view ukey2_secret,
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const std::vector<internal::SharedCredential>& shared_credentials) const;
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// Verifies a signed message received from the Nearby Connections peer.
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// Returns absl::OkStatus() if the verification was successful.
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// ukey2_secret - The shared secret derived from the UKEY2 handshake in NC.
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// received_frame - The received frame from Nearby Connections.
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// local_credentials - The set of local credentials that may contain the
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// required keyseed hash.
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// shared_credentials - The set of shared credentials that can be used to
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// verify the signed contents of the frame.
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absl::StatusOr<internal::LocalCredential> VerifyMessageAsResponder(
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absl::string_view ukey2_secret, InitiatorData initiator_data,
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const std::vector<internal::LocalCredential>& local_credentials,
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const std::vector<internal::SharedCredential>& shared_credentials) const;
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};
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} // namespace presence
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_PRESENCE_IMPLEMENTATION_CONNECTION_AUTHENTICATOR_H_
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