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+namespace Signal.Test {
+
+class SessionBuilderTest : Gee.TestCase {
+ Address alice_address;
+ Address bob_address;
+
+ public SessionBuilderTest() {
+ base("SessionBuilder");
+
+ add_test("basic_pre_key_v2", test_basic_pre_key_v2);
+ add_test("basic_pre_key_v3", test_basic_pre_key_v3);
+ add_test("bad_signed_pre_key_signature", test_bad_signed_pre_key_signature);
+ add_test("repeat_bundle_message_v2", test_repeat_bundle_message_v2);
+ }
+
+ private Context global_context;
+
+ public override void set_up() {
+ try {
+ global_context = new Context();
+ alice_address = new Address();
+ alice_address.name = "+14151111111";
+ alice_address.device_id = 1;
+ bob_address = new Address();
+ bob_address.name = "+14152222222";
+ bob_address.device_id = 1;
+ } catch (Error e) {
+ fail_if_reached(@"Unexpected error: $(e.message)");
+ }
+ }
+
+ public override void tear_down() {
+ global_context = null;
+ alice_address = null;
+ bob_address = null;
+ }
+
+ void test_basic_pre_key_v2() {
+ try {
+ /* Create Alice's data store and session builder */
+ Store alice_store = setup_test_store_context(global_context);
+ SessionBuilder alice_session_builder = alice_store.create_session_builder(bob_address);
+
+ /* Create Bob's data store and pre key bundle */
+ Store bob_store = setup_test_store_context(global_context);
+ uint32 bob_local_registration_id = bob_store.local_registration_id;
+ IdentityKeyPair bob_identity_key_pair = bob_store.identity_key_pair;
+ ECKeyPair bob_pre_key_pair = global_context.generate_key_pair();
+
+ PreKeyBundle bob_pre_key = create_pre_key_bundle(bob_local_registration_id, 1, 31337, bob_pre_key_pair.public, 0, null, null, bob_identity_key_pair.public);
+
+ /*
+ * Have Alice process Bob's pre key bundle, which should fail due to a
+ * missing unsigned pre key.
+ */
+ fail_if_not_error_code(() => alice_session_builder.process_pre_key_bundle(bob_pre_key), ErrorCode.INVALID_KEY);
+ } catch(Error e) {
+ fail_if_reached(@"Unexpected error: $(e.message)");
+ }
+ }
+
+ void test_basic_pre_key_v3() {
+ try {
+ /* Create Alice's data store and session builder */
+ Store alice_store = setup_test_store_context(global_context);
+ SessionBuilder alice_session_builder = alice_store.create_session_builder(bob_address);
+
+ /* Create Bob's data store and pre key bundle */
+ Store bob_store = setup_test_store_context(global_context);
+ uint32 bob_local_registration_id = bob_store.local_registration_id;
+ ECKeyPair bob_pre_key_pair = global_context.generate_key_pair();
+ ECKeyPair bob_signed_pre_key_pair = global_context.generate_key_pair();
+ IdentityKeyPair bob_identity_key_pair = bob_store.identity_key_pair;
+
+ uint8[] bob_signed_pre_key_signature = global_context.calculate_signature(bob_identity_key_pair.private, bob_signed_pre_key_pair.public.serialize());
+
+ PreKeyBundle bob_pre_key = create_pre_key_bundle(bob_local_registration_id, 1, 31337, bob_pre_key_pair.public, 22, bob_signed_pre_key_pair.public, bob_signed_pre_key_signature, bob_identity_key_pair.public);
+
+ /* Have Alice process Bob's pre key bundle */
+ alice_session_builder.process_pre_key_bundle(bob_pre_key);
+
+ /* Check that we can load the session state and verify its version */
+ fail_if_not(alice_store.contains_session(bob_address));
+
+ SessionRecord loaded_record = alice_store.load_session(bob_address);
+ fail_if_not_eq_int((int)loaded_record.state.session_version, 3);
+
+ /* Encrypt an outgoing message to send to Bob */
+ string original_message = "L'homme est condamné à être libre";
+ SessionCipher alice_session_cipher = alice_store.create_session_cipher(bob_address);
+
+ CiphertextMessage outgoing_message = alice_session_cipher.encrypt(original_message.data);
+ fail_if_not_eq_int(outgoing_message.type, CiphertextType.PREKEY);
+
+ /* Convert to an incoming message for Bob */
+ PreKeySignalMessage incoming_message = global_context.deserialize_pre_key_signal_message(outgoing_message.serialized);
+
+ /* Save the pre key and signed pre key in Bob's data store */
+ PreKeyRecord bob_pre_key_record = new PreKeyRecord(bob_pre_key.pre_key_id, bob_pre_key_pair);
+ bob_store.store_pre_key(bob_pre_key_record);
+
+ SignedPreKeyRecord bob_signed_pre_key_record = new SignedPreKeyRecord(22, new DateTime.now_local().to_unix(), bob_signed_pre_key_pair, bob_signed_pre_key_signature);
+ bob_store.store_signed_pre_key(bob_signed_pre_key_record);
+
+ /* Create Bob's session cipher and decrypt the message from Alice */
+ SessionCipher bob_session_cipher = bob_store.create_session_cipher(alice_address);
+
+ /* Prepare the data for the callback test */
+ //int callback_context = 1234;
+ //bob_session_cipher.user_data =
+ //bob_session_cipher.decryption_callback =
+ uint8[] plaintext = bob_session_cipher.decrypt_pre_key_signal_message(incoming_message);
+
+ /* Clean up callback data */
+ bob_session_cipher.user_data = null;
+ bob_session_cipher.decryption_callback = null;
+
+ /* Verify Bob's session state and the decrypted message */
+ fail_if_not(bob_store.contains_session(alice_address));
+
+ SessionRecord alice_recipient_session_record = bob_store.load_session(alice_address);
+
+ SessionState alice_recipient_session_state = alice_recipient_session_record.state;
+ fail_if_not_eq_int((int)alice_recipient_session_state.session_version, 3);
+ fail_if_null(alice_recipient_session_state.alice_base_key);
+
+ fail_if_not_eq_uint8_arr(original_message.data, plaintext);
+
+ /* Have Bob send a reply to Alice */
+ CiphertextMessage bob_outgoing_message = bob_session_cipher.encrypt(original_message.data);
+ fail_if_not_eq_int(bob_outgoing_message.type, CiphertextType.SIGNAL);
+
+ /* Verify that Alice can decrypt it */
+ SignalMessage bob_outgoing_message_copy = global_context.copy_signal_message(bob_outgoing_message);
+
+ uint8[] alice_plaintext = alice_session_cipher.decrypt_signal_message(bob_outgoing_message_copy);
+
+ fail_if_not_eq_uint8_arr(original_message.data, alice_plaintext);
+
+ GLib.Test.message("Pre-interaction tests complete");
+
+ /* Interaction tests */
+ run_interaction(alice_store, bob_store);
+
+ /* Cleanup state from previous tests that we need to replace */
+ alice_store = null;
+ bob_pre_key_pair = null;
+ bob_signed_pre_key_pair = null;
+ bob_identity_key_pair = null;
+ bob_signed_pre_key_signature = null;
+ bob_pre_key_record = null;
+ bob_signed_pre_key_record = null;
+
+ /* Create Alice's new session data */
+ alice_store = setup_test_store_context(global_context);
+ alice_session_builder = alice_store.create_session_builder(bob_address);
+ alice_session_cipher = alice_store.create_session_cipher(bob_address);
+
+ /* Create Bob's new pre key bundle */
+ bob_pre_key_pair = global_context.generate_key_pair();
+ bob_signed_pre_key_pair = global_context.generate_key_pair();
+ bob_identity_key_pair = bob_store.identity_key_pair;
+ bob_signed_pre_key_signature = global_context.calculate_signature(bob_identity_key_pair.private, bob_signed_pre_key_pair.public.serialize());
+ bob_pre_key = create_pre_key_bundle(bob_local_registration_id, 1, 31338, bob_pre_key_pair.public, 23, bob_signed_pre_key_pair.public, bob_signed_pre_key_signature, bob_identity_key_pair.public);
+
+ /* Save the new pre key and signed pre key in Bob's data store */
+ bob_pre_key_record = new PreKeyRecord(bob_pre_key.pre_key_id, bob_pre_key_pair);
+ bob_store.store_pre_key(bob_pre_key_record);
+
+ bob_signed_pre_key_record = new SignedPreKeyRecord(23, new DateTime.now_local().to_unix(), bob_signed_pre_key_pair, bob_signed_pre_key_signature);
+ bob_store.store_signed_pre_key(bob_signed_pre_key_record);
+
+ /* Have Alice process Bob's pre key bundle */
+ alice_session_builder.process_pre_key_bundle(bob_pre_key);
+
+ /* Have Alice encrypt a message for Bob */
+ outgoing_message = alice_session_cipher.encrypt(original_message.data);
+ fail_if_not_eq_int(outgoing_message.type, CiphertextType.PREKEY);
+
+ /* Have Bob try to decrypt the message */
+ PreKeySignalMessage outgoing_message_copy = global_context.copy_pre_key_signal_message(outgoing_message);
+
+ /* The decrypt should fail with a specific error */
+ fail_if_not_error_code(() => bob_session_cipher.decrypt_pre_key_signal_message(outgoing_message_copy), ErrorCode.UNTRUSTED_IDENTITY);
+
+ outgoing_message_copy = global_context.copy_pre_key_signal_message(outgoing_message);
+
+ /* Save the identity key to Bob's store */
+ bob_store.save_identity(alice_address, outgoing_message_copy.identity_key);
+
+ /* Try the decrypt again, this time it should succeed */
+ outgoing_message_copy = global_context.copy_pre_key_signal_message(outgoing_message);
+ plaintext = bob_session_cipher.decrypt_pre_key_signal_message(outgoing_message_copy);
+
+ fail_if_not_eq_uint8_arr(original_message.data, plaintext);
+
+ /* Create a new pre key for Bob */
+ ECPublicKey test_public_key = create_test_ec_public_key(global_context);
+
+ IdentityKeyPair alice_identity_key_pair = alice_store.identity_key_pair;
+
+ bob_pre_key = create_pre_key_bundle(bob_local_registration_id, 1, 31337, test_public_key, 23, bob_signed_pre_key_pair.public, bob_signed_pre_key_signature, alice_identity_key_pair.public);
+
+ /* Have Alice process Bob's new pre key bundle, which should fail */
+ fail_if_not_error_code(() => alice_session_builder.process_pre_key_bundle(bob_pre_key), ErrorCode.UNTRUSTED_IDENTITY);
+
+ GLib.Test.message("Post-interaction tests complete");
+ } catch(Error e) {
+ fail_if_reached(@"Unexpected error: $(e.message)");
+ }
+ }
+
+ void test_bad_signed_pre_key_signature() {
+ try {
+ /* Create Alice's data store and session builder */
+ Store alice_store = setup_test_store_context(global_context);
+ SessionBuilder alice_session_builder = alice_store.create_session_builder(bob_address);
+
+ /* Create Bob's data store */
+ Store bob_store = setup_test_store_context(global_context);
+
+ /* Create Bob's regular and signed pre key pairs */
+ ECKeyPair bob_pre_key_pair = global_context.generate_key_pair();
+ ECKeyPair bob_signed_pre_key_pair = global_context.generate_key_pair();
+
+ /* Create Bob's signed pre key signature */
+ IdentityKeyPair bob_identity_key_pair = bob_store.identity_key_pair;
+ uint8[] bob_signed_pre_key_signature = global_context.calculate_signature(bob_identity_key_pair.private, bob_signed_pre_key_pair.public.serialize());
+
+ for (int i = 0; i < bob_signed_pre_key_signature.length * 8; i++) {
+ uint8[] modified_signature = bob_signed_pre_key_signature[0:bob_signed_pre_key_signature.length];
+
+ /* Intentionally corrupt the signature data */
+ modified_signature[i/8] ^= (1 << ((uint8)i % 8));
+
+ /* Create a pre key bundle */
+ PreKeyBundle bob_pre_key = create_pre_key_bundle(bob_store.local_registration_id,1,31137,bob_pre_key_pair.public,22,bob_signed_pre_key_pair.public,modified_signature,bob_identity_key_pair.public);
+
+ /* Process the bundle and make sure we fail with an invalid key error */
+ fail_if_not_error_code(() => alice_session_builder.process_pre_key_bundle(bob_pre_key), ErrorCode.INVALID_KEY);
+ }
+
+ /* Create a correct pre key bundle */
+ PreKeyBundle bob_pre_key = create_pre_key_bundle(bob_store.local_registration_id,1,31137,bob_pre_key_pair.public,22,bob_signed_pre_key_pair.public,bob_signed_pre_key_signature,bob_identity_key_pair.public);
+
+ /* Process the bundle and make sure we do not fail */
+ alice_session_builder.process_pre_key_bundle(bob_pre_key);
+ } catch(Error e) {
+ fail_if_reached(@"Unexpected error: $(e.message)");
+ }
+ }
+
+ void test_repeat_bundle_message_v2() {
+ try {
+ /* Create Alice's data store and session builder */
+ Store alice_store = setup_test_store_context(global_context);
+ SessionBuilder alice_session_builder = alice_store.create_session_builder(bob_address);
+
+ /* Create Bob's data store and pre key bundle */
+ Store bob_store = setup_test_store_context(global_context);
+ ECKeyPair bob_pre_key_pair = global_context.generate_key_pair();
+ ECKeyPair bob_signed_pre_key_pair = global_context.generate_key_pair();
+ uint8[] bob_signed_pre_key_signature = global_context.calculate_signature(bob_store.identity_key_pair.private, bob_signed_pre_key_pair.public.serialize());
+ PreKeyBundle bob_pre_key = create_pre_key_bundle(bob_store.local_registration_id,1,31337,bob_pre_key_pair.public,0,null,null,bob_store.identity_key_pair.public);
+
+ /* Add Bob's pre keys to Bob's data store */
+ PreKeyRecord bob_pre_key_record = new PreKeyRecord(bob_pre_key.pre_key_id, bob_pre_key_pair);
+ bob_store.store_pre_key(bob_pre_key_record);
+ SignedPreKeyRecord bob_signed_pre_key_record = new SignedPreKeyRecord(22, new DateTime.now_local().to_unix(), bob_signed_pre_key_pair, bob_signed_pre_key_signature);
+ bob_store.store_signed_pre_key(bob_signed_pre_key_record);
+
+ /*
+ * Have Alice process Bob's pre key bundle, which should fail due to a
+ * missing signed pre key.
+ */
+ fail_if_not_error_code(() => alice_session_builder.process_pre_key_bundle(bob_pre_key), ErrorCode.INVALID_KEY);
+ } catch(Error e) {
+ fail_if_reached(@"Unexpected error: $(e.message)");
+ }
+ }
+
+ class Holder {
+ public uint8[] data { get; private set; }
+
+ public Holder(uint8[] data) {
+ this.data = data;
+ }
+ }
+
+ void run_interaction(Store alice_store, Store bob_store) throws Error {
+
+ /* Create the session ciphers */
+ SessionCipher alice_session_cipher = alice_store.create_session_cipher(bob_address);
+ SessionCipher bob_session_cipher = bob_store.create_session_cipher(alice_address);
+
+ /* Create a test message */
+ string original_message = "smert ze smert";
+
+ /* Simulate Alice sending a message to Bob */
+ CiphertextMessage alice_message = alice_session_cipher.encrypt(original_message.data);
+ fail_if_not_eq_int(alice_message.type, CiphertextType.SIGNAL);
+
+ SignalMessage alice_message_copy = global_context.copy_signal_message(alice_message);
+ uint8[] plaintext = bob_session_cipher.decrypt_signal_message(alice_message_copy);
+ fail_if_not_eq_uint8_arr(original_message.data, plaintext);
+
+ GLib.Test.message("Interaction complete: Alice -> Bob");
+
+ /* Simulate Bob sending a message to Alice */
+ CiphertextMessage bob_message = bob_session_cipher.encrypt(original_message.data);
+ fail_if_not_eq_int(alice_message.type, CiphertextType.SIGNAL);
+
+ SignalMessage bob_message_copy = global_context.copy_signal_message(bob_message);
+ plaintext = alice_session_cipher.decrypt_signal_message(bob_message_copy);
+ fail_if_not_eq_uint8_arr(original_message.data, plaintext);
+
+ GLib.Test.message("Interaction complete: Bob -> Alice");
+
+ /* Looping Alice -> Bob */
+ for (int i = 0; i < 10; i++) {
+ uint8[] looping_message = create_looping_message(i);
+ CiphertextMessage alice_looping_message = alice_session_cipher.encrypt(looping_message);
+ SignalMessage alice_looping_message_copy = global_context.copy_signal_message(alice_looping_message);
+ uint8[] looping_plaintext = bob_session_cipher.decrypt_signal_message(alice_looping_message_copy);
+ fail_if_not_eq_uint8_arr(looping_message, looping_plaintext);
+ }
+ GLib.Test.message("Interaction complete: Alice -> Bob (looping)");
+
+ /* Looping Bob -> Alice */
+ for (int i = 0; i < 10; i++) {
+ uint8[] looping_message = create_looping_message(i);
+ CiphertextMessage bob_looping_message = bob_session_cipher.encrypt(looping_message);
+ SignalMessage bob_looping_message_copy = global_context.copy_signal_message(bob_looping_message);
+ uint8[] looping_plaintext = alice_session_cipher.decrypt_signal_message(bob_looping_message_copy);
+ fail_if_not_eq_uint8_arr(looping_message, looping_plaintext);
+ }
+ GLib.Test.message("Interaction complete: Bob -> Alice (looping)");
+
+ /* Generate a shuffled list of encrypted messages for later use */
+ Holder[] alice_ooo_plaintext = new Holder[10];
+ Holder[] alice_ooo_ciphertext = new Holder[10];
+ for (int i = 0; i < 10; i++) {
+ alice_ooo_plaintext[i] = new Holder(create_looping_message(i));
+ alice_ooo_ciphertext[i] = new Holder(alice_session_cipher.encrypt(alice_ooo_plaintext[i].data).serialized);
+ }
+
+ for (int i = 0; i < 10; i++) {
+ uint32 s = Random.next_int() % 10;
+ Holder tmp = alice_ooo_plaintext[s];
+ alice_ooo_plaintext[s] = alice_ooo_plaintext[i];
+ alice_ooo_plaintext[i] = tmp;
+ tmp = alice_ooo_ciphertext[s];
+ alice_ooo_ciphertext[s] = alice_ooo_ciphertext[i];
+ alice_ooo_ciphertext[i] = tmp;
+ }
+ GLib.Test.message("Shuffled Alice->Bob messages created");
+
+ /* Looping Alice -> Bob (repeated) */
+ for (int i = 0; i < 10; i++) {
+ uint8[] looping_message = create_looping_message(i);
+ CiphertextMessage alice_looping_message = alice_session_cipher.encrypt(looping_message);
+ SignalMessage alice_looping_message_copy = global_context.copy_signal_message(alice_looping_message);
+ uint8[] looping_plaintext = bob_session_cipher.decrypt_signal_message(alice_looping_message_copy);
+ fail_if_not_eq_uint8_arr(looping_message, looping_plaintext);
+ }
+ GLib.Test.message("Interaction complete: Alice -> Bob (looping, repeated)");
+
+ /* Looping Bob -> Alice (repeated) */
+ for (int i = 0; i < 10; i++) {
+ uint8[] looping_message = create_looping_message(i);
+ CiphertextMessage bob_looping_message = bob_session_cipher.encrypt(looping_message);
+ SignalMessage bob_looping_message_copy = global_context.copy_signal_message(bob_looping_message);
+ uint8[] looping_plaintext = alice_session_cipher.decrypt_signal_message(bob_looping_message_copy);
+ fail_if_not_eq_uint8_arr(looping_message, looping_plaintext);
+ }
+ GLib.Test.message("Interaction complete: Bob -> Alice (looping, repeated)");
+
+ /* Shuffled Alice -> Bob */
+ for (int i = 0; i < 10; i++) {
+ SignalMessage ooo_message_deserialized = global_context.deserialize_signal_message(alice_ooo_ciphertext[i].data);
+ uint8[] ooo_plaintext = bob_session_cipher.decrypt_signal_message(ooo_message_deserialized);
+ fail_if_not_eq_uint8_arr(alice_ooo_plaintext[i].data, ooo_plaintext);
+ }
+ GLib.Test.message("Interaction complete: Alice -> Bob (shuffled)");
+ }
+
+ uint8[] create_looping_message(int index) {
+ return (@"You can only desire based on what you know: $index").data;
+ }
+
+ /*
+ uint8[] create_looping_message_short(int index) {
+ return ("What do we mean by saying that existence precedes essence? " +
+ "We mean that man first of all exists, encounters himself, " +
+ @"surges up in the world--and defines himself aftward. $index").data;
+ }
+ */
+}
+
+} \ No newline at end of file