DartFlutter信号协议库_Dart_下载.zip

# libsignal_protocol_dart [](https://pub.dartlang.org/packages/libsignal_protocol_dart) [](https://github.com/MixinNetwork/libsignal_protocol_dart/actions) libsignal_protocol_dart is a pure Dart/Flutter implementation of the Signal Protocol. ## Documentation For more information on how the Signal Protocol works: - [Double Ratchet](https://whispersystems.org/docs/specifications/doubleratchet/) - [X3DH Key Agreement](https://whispersystems.org/docs/specifications/x3dh/) - [XEdDSA Signature Schemes](https://whispersystems.org/docs/specifications/xeddsa/) - [Signal Protocol Java](https://github.com/signalapp/libsignal-protocol-java/) ## Usage ## Install time At install time, a signal client needs to generate its identity keys, registration id, and prekeys. ```dart Future<void> install() async { final identityKeyPair = generateIdentityKeyPair(); final registrationId = generateRegistrationId(false); final preKeys = generatePreKeys(0, 110); final signedPreKey = generateSignedPreKey(identityKeyPair, 0); final sessionStore = InMemorySessionStore(); final preKeyStore = InMemoryPreKeyStore(); final signedPreKeyStore = InMemorySignedPreKeyStore(); final identityStore = InMemoryIdentityKeyStore(identityKeyPair, registrationId); for (var p in preKeys) { await preKeyStore.storePreKey(p.id, p); } await signedPreKeyStore.storeSignedPreKey(signedPreKey.id, signedPreKey); } ``` ## Building a session A signal client needs to implement four interfaces: IdentityKeyStore, PreKeyStore, SignedPreKeyStore, and SessionStore. These will manage loading and storing of identity, prekeys, signed prekeys, and session state. Once those are implemented, you can build a session in this way: ```dart final remoteAddress = SignalProtocolAddress("remote", 1); final sessionBuilder = SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore, identityStore, remoteAddress); sessionBuilder.processPreKeyBundle(retrievedPreKey); final sessionCipher = SessionCipher(sessionStore, preKeyStore, signedPreKeyStore, identityStore, remoteAddress); final ciphertext = sessionCipher.encrypt(utf8.encode("Hello Mixin")); deliver(ciphertext); ``` ## Building a group session If you wanna send message to a group, send a SenderKeyDistributionMessage to all members of the group. ```dart const alice = SignalProtocolAddress('+00000000001', 1); const groupSender = SenderKeyName('Private group', alice); final aliceStore = InMemorySenderKeyStore(); final bobStore = InMemorySenderKeyStore(); final aliceSessionBuilder = GroupSessionBuilder(aliceStore); final bobSessionBuilder = GroupSessionBuilder(bobStore); final aliceGroupCipher = GroupCipher(aliceStore, groupSender); final bobGroupCipher = GroupCipher(bobStore, groupSender); final sentAliceDistributionMessage = await aliceSessionBuilder.create(groupSender); final receivedAliceDistributionMessage = SenderKeyDistributionMessageWrapper.fromSerialized( sentAliceDistributionMessage.serialize()); await bobSessionBuilder.process( groupSender, receivedAliceDistributionMessage); final ciphertextFromAlice = await aliceGroupCipher .encrypt(Uint8List.fromList(utf8.encode('Hello Mixin'))); final plaintextFromAlice = await bobGroupCipher.decrypt(ciphertextFromAlice); // ignore: avoid_print print(utf8.decode(plaintextFromAlice)); ```