private May <uint> processV2(SessionRecord sessionRecord, PreKeyWhisperMessage message)
{
if (!message.getPreKeyId().HasValue)
{
throw new InvalidKeyIdException("V2 message requires one time prekey id!");
}
if (!preKeyStore.ContainsPreKey(message.getPreKeyId().ForceGetValue()) &&
sessionStore.ContainsSession(remoteAddress))
{
//Log.w(TAG, "We've already processed the prekey part of this V2 session, letting bundled message fall through...");
return(May <uint> .NoValue); //May.absent();
}
ECKeyPair ourPreKey = preKeyStore.LoadPreKey(message.getPreKeyId().ForceGetValue()).getKeyPair();
BobAxolotlParameters.Builder parameters = BobAxolotlParameters.newBuilder();
parameters.setOurIdentityKey(identityKeyStore.GetIdentityKeyPair())
.setOurSignedPreKey(ourPreKey)
.setOurRatchetKey(ourPreKey)
.setOurOneTimePreKey(May <ECKeyPair> .NoValue) //absent
.setTheirIdentityKey(message.getIdentityKey())
.setTheirBaseKey(message.getBaseKey());
if (!sessionRecord.isFresh())
{
sessionRecord.archiveCurrentState();
}
RatchetingSession.initializeSession(sessionRecord.getSessionState(), message.getMessageVersion(), parameters.create());
sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.GetLocalRegistrationId());
sessionRecord.getSessionState().setRemoteRegistrationId(message.getRegistrationId());
sessionRecord.getSessionState().setAliceBaseKey(message.getBaseKey().serialize());
if (message.getPreKeyId().ForceGetValue() != Medium.MAX_VALUE)
{
return(message.getPreKeyId());
}
else
{
return(May <uint> .NoValue); // May.absent();
}
}
private May <uint> ProcessV2(SessionRecord sessionRecord, PreKeyWhisperMessage message)
{
if (!message.GetPreKeyId().HasValue)
{
throw new InvalidKeyIdException("V2 message requires one time prekey id!");
}
if (!preKeyStore.ContainsPreKey(message.GetPreKeyId().ForceGetValue()) &&
sessionStore.ContainsSession(remoteAddress))
{
return(May <uint> .NoValue);
}
ECKeyPair ourPreKey = preKeyStore.LoadPreKey(message.GetPreKeyId().ForceGetValue()).GetKeyPair();
BobAxolotlParameters.Builder parameters = BobAxolotlParameters.NewBuilder();
parameters.SetOurIdentityKey(identityKeyStore.GetIdentityKeyPair())
.SetOurSignedPreKey(ourPreKey)
.SetOurRatchetKey(ourPreKey)
.SetOurOneTimePreKey(May <ECKeyPair> .NoValue) //absent
.SetTheirIdentityKey(message.GetIdentityKey())
.SetTheirBaseKey(message.GetBaseKey());
if (!sessionRecord.IsFresh())
{
sessionRecord.ArchiveCurrentState();
}
RatchetingSession.InitializeSession(sessionRecord.GetSessionState(), message.GetMessageVersion(), parameters.Create());
sessionRecord.GetSessionState().SetLocalRegistrationId(identityKeyStore.GetLocalRegistrationId());
sessionRecord.GetSessionState().SetRemoteRegistrationId(message.GetRegistrationId());
sessionRecord.GetSessionState().SetAliceBaseKey(message.GetBaseKey().Serialize());
if (message.GetPreKeyId().ForceGetValue() != Medium.MAX_VALUE)
{
return(message.GetPreKeyId());
}
else
{
return(May <uint> .NoValue); // May.absent();
}
}
public Models.Message[] GetMessages(ISharedPreferences sharedPref, User SelectedFriend, SessionStore sessionStore,
PreKeyStore preKeyStore, SignedPreKeyStore signedPreKeyStore, IdentityKeyStore identityStore, SignalProtocolAddress SelectedFriendAddress)
{
// send the server the user name
// server side does the selection and return the messages and store it in a message array.
//Send the login username and password to the server and get response
string apiUrl = "https://ycandgap.me/api_server2.php";
string apiMethod = "getMessage";
//Login_Request has two properties:username and password
Login_Request myLogin_Request = new Login_Request();
Models.Message recieveMessage = new Models.Message();
//get the login username from previow login page.
recieveMessage.MessageReceiverRegisID = Convert.ToUInt32(sharedPref.GetString("RegistrationId", string.Empty));
recieveMessage.MessageSenderRegisID = SelectedFriend.RegisterationID;
myLogin_Request.message = recieveMessage;
UserID = myLogin_Request.RegistrationID;
// make http post request
string response = Http.Post(apiUrl, new NameValueCollection()
{
{ "api_method", apiMethod },
{ "api_data", JsonConvert.SerializeObject(myLogin_Request) }
});
// decode json string to dto object
API_Response2 r = JsonConvert.DeserializeObject <API_Response2>(response);
// check response
if (r != null)
{
if (!r.IsError && !string.IsNullOrEmpty(r.MessageText))
{
SessionCipher sessionCipher = new SessionCipher(sessionStore, preKeyStore, signedPreKeyStore, identityStore, SelectedFriendAddress);
byte[] decipherMessage;
if (!sessionStore.ContainsSession(SelectedFriendAddress))
{
decipherMessage = sessionCipher.decrypt(new PreKeySignalMessage((JsonConvert.DeserializeObject <byte[]>(r.MessageText))));
}
else
{
decipherMessage = sessionCipher.decrypt(new SignalMessage((JsonConvert.DeserializeObject <byte[]>(r.MessageText))));
}
string checkMessage = Encoding.UTF8.GetString(decipherMessage);
SelectedFriend.SelectedUserMessages.Add(new Models.Message
{
MessageID = r.MessageID,
MessageSenderRegisID = r.MessageSenderRegisID,
MessageReceiverRegisID = r.MessageReceiverRegisID,
MessageText = checkMessage,
MessageTimestamp = r.MessageTimestamp
});
return(SelectedFriend.SelectedUserMessages.ToArray());
}
else
{
//if login fails, pop up an alert message. Wrong username or password or a new user
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
if (!string.IsNullOrEmpty(r.ErrorMessage))
{
dialogBuilder.SetMessage(r.ErrorMessage);
}
else
{
dialogBuilder.SetMessage("No new messages");
}
//dialogBuilder.SetPositiveButton("Ok", null);
dialogBuilder.Show();
return(null);
}
}
else
{
if (!sessionStore.ContainsSession(SelectedFriendAddress))
{
// Instantiate a SessionBuilder for a remote recipientId + deviceId tuple.
SessionBuilder sessionBuilder = new SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore,
identityStore, SelectedFriendAddress);
RetrievedPreKey preKeyPublic = RetrieveSelectedFriendPublicPreKey(SelectedFriend);
IdentityKey SelectedFriendSignedPreKey = new IdentityKey(JsonConvert.DeserializeObject <byte[]>(SelectedFriend.SignedPreKey), 0);
PreKeyBundle retrievedPreKey = new PreKeyBundle(SelectedFriend.RegisterationID, 1, preKeyPublic.PrekeyID, preKeyPublic.PublicPreKey.getPublicKey()
, SelectedFriend.SignedPreKeyID, SelectedFriendSignedPreKey.getPublicKey(), JsonConvert.DeserializeObject <byte[]>(SelectedFriend.SignedPreKeySignature)
, new IdentityKey(JsonConvert.DeserializeObject <byte[]>(SelectedFriend.IdentityKey), 0));
// Build a session with a PreKey retrieved from the server.
sessionBuilder.process(retrievedPreKey);
}
return(null);
}
}
public bool ContainsSession(AxolotlAddress address)
{
return(sessionStore.ContainsSession(address));
}
public bool containsSession(SignalProtocolAddress address)
{
return(SESSION_STORE.ContainsSession(address));
}
public bool ContainsSession(SignalProtocolAddress address)
{
return(sessionStore.ContainsSession(address));
}