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// Copyright 2020 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.
#include "securegcm/d2d_connection_context_v1.h"
#include "securegcm/d2d_crypto_ops.h"
#include "gtest/gtest.h"
namespace securegcm {
using securemessage::CryptoOps;
namespace {
// The encode and decode keys should be 32 bytes.
const char kEncodeKeyData[] = "initiator_encode_key_for_aes_256";
const char kDecodeKeyData[] = "initiator_decode_key_for_aes_256";
} // namespace
// A friend to access the private variables of D2DConnectionContextV1.
class D2DConnectionContextV1Peer {
public:
explicit D2DConnectionContextV1Peer(const std::string& savedSessionInfo) {
context_ = D2DConnectionContextV1::FromSavedSession(savedSessionInfo);
}
D2DConnectionContextV1* GetContext() { return context_.get(); }
uint32_t GetEncodeSequenceNumber() {
return context_->encode_sequence_number_;
}
uint32_t GetDecodeSequenceNumber() {
return context_->decode_sequence_number_;
}
private:
std::unique_ptr<D2DConnectionContextV1> context_;
};
TEST(D2DConnectionContextionV1Test, SaveSession) {
CryptoOps::SecretKey encodeKey = CryptoOps::SecretKey(
kEncodeKeyData, CryptoOps::KeyAlgorithm::AES_256_KEY);
CryptoOps::SecretKey decodeKey = CryptoOps::SecretKey(
kDecodeKeyData, CryptoOps::KeyAlgorithm::AES_256_KEY);
D2DConnectionContextV1 initiator =
D2DConnectionContextV1(encodeKey, decodeKey, 0, 1);
D2DConnectionContextV1 responder =
D2DConnectionContextV1(decodeKey, encodeKey, 1, 0);
std::unique_ptr<std::string> initiatorSavedSessionState =
initiator.SaveSession();
std::unique_ptr<std::string> responderSavedSessionState =
responder.SaveSession();
D2DConnectionContextV1Peer restoredInitiator =
D2DConnectionContextV1Peer(*initiatorSavedSessionState);
D2DConnectionContextV1Peer restoredResponder =
D2DConnectionContextV1Peer(*responderSavedSessionState);
// Verify internal state matches initialization.
EXPECT_EQ(0, restoredInitiator.GetEncodeSequenceNumber());
EXPECT_EQ(1, restoredInitiator.GetDecodeSequenceNumber());
EXPECT_EQ(1, restoredResponder.GetEncodeSequenceNumber());
EXPECT_EQ(0, restoredResponder.GetDecodeSequenceNumber());
EXPECT_EQ(*restoredInitiator.GetContext()->GetSessionUnique(),
*restoredResponder.GetContext()->GetSessionUnique());
const std::string message = "ping";
// Ensure that they can still talk to one another.
std::string encodedMessage =
*restoredInitiator.GetContext()->EncodeMessageToPeer(message);
std::string decodedMessage =
*restoredResponder.GetContext()->DecodeMessageFromPeer(encodedMessage);
EXPECT_EQ(message, decodedMessage);
encodedMessage =
*restoredResponder.GetContext()->EncodeMessageToPeer(message);
decodedMessage =
*restoredInitiator.GetContext()->DecodeMessageFromPeer(encodedMessage);
EXPECT_EQ(message, decodedMessage);
}
TEST(D2DConnectionContextionV1Test, SaveSession_TooShort) {
CryptoOps::SecretKey encodeKey = CryptoOps::SecretKey(
kEncodeKeyData, CryptoOps::KeyAlgorithm::AES_256_KEY);
CryptoOps::SecretKey decodeKey = CryptoOps::SecretKey(
kDecodeKeyData, CryptoOps::KeyAlgorithm::AES_256_KEY);
D2DConnectionContextV1 initiator =
D2DConnectionContextV1(encodeKey, decodeKey, 0, 1);
std::unique_ptr<std::string> initiatorSavedSessionState =
initiator.SaveSession();
// Try to rebuild the context with a shorter session state.
std::string shortSessionState = initiatorSavedSessionState->substr(
0, initiatorSavedSessionState->size() - 1);
D2DConnectionContextV1Peer restoredInitiator =
D2DConnectionContextV1Peer(shortSessionState);
// nullptr is returned on error. It should not crash.
EXPECT_EQ(restoredInitiator.GetContext(), nullptr);
}
} // namespace securegcm
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