faissaloo / telegram-micro

Telegram implementation for J2ME devices

TelegramMicro

TelegramMicro is an attempt to build a Telegram implementation for J2ME, there's still alot of work to be done but I think I've gotten most of the difficult stuff out of the way now (in terms of protocol and such) it's just a matter of implementing all the MTProto objects and creating a UI.

Useful links

• CLDC 1.1 reference
• MIDP 2.0 reference

Building

This project can be built using the Sun Java Wireless Toolkit, which you can install on Ubuntu by following this StackOverflow answer. Once installed you should copy this repository to your j2mewtk folder (default is ~/j2mewtk) under 2.5.2/apps/ and you should see it when you go to 'open project'. Then you can click build then run.

Troubleshooting WTK

• If the emulator comes up with a white screen restart your computer, I think there's some weird conflict with Docker, so launching docker at any point during a session means you'll need to restart your computer.
• Additional emulator instances may randomly appear when running, just get used to ignoring or closing them, it's a bug with ktoolbar.

Sideprojects

If you want to help out but don't want to work on this part of the project, there are a few things that would be useful:

• A J2ME runtime that can run headlessly so we can have a real CI pipeline
• A modern libre replacement for the J2ME WTK that doesn't require as much hassle to get running
• Some kind of preprocessor or compiler that would give us compile time function execution so that we can optimise things like public key storage while keeping the code readable

telegram-micro's Issues

Documentations

As a open-source project, i think adding descriptions to the methods, and bibliography to your codes with diagrams, would help a lot. I saw it's only SSH stuff (wich i never messed with) until then and there should be some documentations explaining how that works.

Layout

I'm making something that i think it might help with the project's layout in the future
https://github.com/JoseskVolpe/PixelyVulpine-Layout

How to make Export Jar for External J2me Phone

Hello, thank you for developing this project, how can you get a suitable output for Java phones at home , not emulator ?

Key generation

Hi faissaloo, just wanted to compliment you on this project, looks awesome and got me kind of interested in crypto :)

In the Readme you propose to outsource some of the calculation work to a server. I tried that and it works. Decomposing the primes can be done with the linux standard tool factor, it's fast and mature and no harm done when sending the data unencrypted.

However, the bigger problem is this line, it takes more time than prime decomposing and it cannot be outsourced to a server because this is private key stuff. That's why I think the server approach will not work to get the auth handshake to a reasonable amount of time.

One solution might be to restrict the app to JSR177-capable devices, where those things can be calculated natively in the JRE. However, I'm not expert enough to wrap my head around it, also I fear I'd make mistakes that would sabotage the whole encryption.

Not really an issue, just wanted to tell you how much I love this

Thank you for working on it. I did some J2ME stuff recently and will be happy to help out with some tasks, either directly with Java or something from the "related" section. Cheers!

Proposal: include prebuilt J2ME JARs -- it's TOO HARD TO COMPILE UNDER WSL!!

Hello, @faissaloo! I have a little proposal for you -- can you please include pre-compiled JARs?
It's very hard to compile under WSL.
preverify fails very weirdly when I try to build -- it says 1: Syntax error: "(" unexpected.
Run complains about sublime.so.
I dunno what to do... Please help me!

Create the EncryptedMessage class

https://core.telegram.org/mtproto/description#message-key-msg-key
https://core.telegram.org/mtproto/description#defining-aes-key-and-initialization-vector

This is not an issue but probably helps you.

https://vikamobile.ru/ Stella Mobile is a j2me app(Telegram client), hope that this can help you with something. I'm an starter developer too, but hope that your proyect come outs and shine, i really love j2me old phones, they take me back to the childhood