Readme

The 100% console based messaging program using the cryptography library in python; a project I made for my cryptograpghy course.

This code is probably not 100% secure, please only use it for educational purposes.

All the core functionality of the program are in hai_core.py

Features

• Console based
• Supports multiple chats at the same time (using non-blocking sockets)
• Custom handshake based on TLS
• Supports elliptic curve keys
• Hmac validates messages (iv's are never reused)
• Error messages for invalid / unvalidates messages

Note: Public key verification using a CA not implemented.

Quick Start

This program was developed and tested using python 3.11.6.

Make a new virtual environment and instal the required packages

python3 -m venv venv
. ./venv/bin/activate
pip install -r requirements.txt

Then start the program in hai.py.

python3 hai.py

Settings

You can configure the program in hai.py.

Key generation

Keys will be automatically generated. You can generate your own keys using the create_keys.sh program.

chmod +x create_keys.sh
./create_keys.sh

Then change the PRIVATE_KEY and PUBLIC_KEY settings in settings.py.

Note: Keys have to be encoded in PEM format and use an elliptic curve.