goofy ahh private (hoepfully) TCP Chat

How to Use Client?
Download the client.c, Makefile, setup.sh and runClient.sh files
Get dependencies liboqs using ./setup.sh on any linux terminal (tested on WSL/Termux/VMWare using Ubuntu/Kali)
Compile using make <br? Execute using ./runClient.sh for 1st time or simply ./client for subsequent executions
Enter the public host IP 152.67.7.144
Enter the port 25021
Enter the password (if in allowlist) else the golden passkey
Beep Boop - You're in!...as long as my server.c is running ;)

Log 1 ("the first 04:04")
03.Sep.2025

ADDED 'client.c' and 'server.c'
Features as of this commit:

• Standard 1on1 TCP based CLI chat service
• Password authentication
• Private to public IP tunelling via Cloudboot.in

Log 2 ("they are watching")
06.Sep.2025

UPDATED 'client.c' and 'server.c'
ADDED 'firewall.conf'
Features as of this commit:

• Added an in-code, toy firewall via IP allowlisting
• Accomodate spaces in between chat message sentences
• Fixed a potential security risk in variable handling

Log 3 ("Uh uh uh! You didn't say the magic word!")
11.Sep.2025

UPDATED 'client.c' and 'server.c'
Features as of this commit:

• Added a golden passkey, when entered, skips the firewall checking
  
• Added colors to console lines at important checkpoints
  
• Added sound pings as notifcation for message receipt
  
• Improved console text formatting
  

Log 4 ("for the unkown listeners of the night")
27.Sep.2025

UPDATED 'client.c' and 'server.c'
Features as of this commit:

• Added two-way encryption in chat messages using the Vigenere Cipher
  
• Added Diffie-Hellman Exchange protocol to generate & exchange server & client side keys
  
• Added the rotating dash waiting animation using threads
• Optimized functions and scope of variables as necessary

Log 5 ("Keep em coming")
03.Oct.2025

UPDATED 'client.c' and 'server.c'
Features as of this commit:

• Added asynchronous texting for using separate threads for sending() & receiving()
  
• Added clientside RTT latency checker keys
  
• Optimized client code by removing stale functions

Log 6 ("Repair, Reflect and Re-emerge")
08.Oct.2025

UPDATED 'client.c' and 'server.c'
ADDED 'motd.txt'
Features as of this commit:

• Remodelled chat threads and fixed a major practical issue* of asynchronous chat using the ncurses library
  
• Significant terminal UI overhaul
  
• Added rate limiting for clients via Token Bucket principle
  
• Added a word of the day for each chat session
  

Log 7 ("Wanted dead or and alive")
21.Oct.2025

UPDATED 'client.c' and 'server.c'
ADDED 'Makefile'
ADDED 'setup.sh'
ADDED './runServer.c' and './runClient'
Features as of this commit:

• Added postquantum cryptographic security via the CRYSTALS-Kyber 768 algorithm for the shared session key, replacing Diffie Hellman Key Exchange
  
• Added the AES-GCM 256 standard cipher for encrypt/decryption of chat messages, along with its innate HMAC principle, replacing Vigenere Cipher
  
• Optimized the workflow for first time users via Makefile and setup.sh files
  
• Code revision to remove obselete functions
  
• Updated the token refill rate for rate limiting
  

This project requires the Open Quantum Safe (OQS) library (liboqs) for its post-quantum cryptography. The setup.sh script will automatically clone and build it.

• liboqs: https://github.com/open-quantum-safe/liboqs
• liboqs is licensed under the MIT license.