CagsTech CagsTech
lwIP-CE
ti-84+ ce networking security

lwIP-CE

Lightweight TCP/IP stack for the TI-84+ CE with an integrated Ethernet driver derived from lwIP by nonGNU.

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Release: wip

  • Contains a USB Ethernet driver written for the platform with robust error handling and memory management.
  • TLS stack development in progress, derived from CryptX (and will replace it eventually).

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ti-84+ ce networking

Expanse

An MMO for the TI-84+ CE where players get to command their own starship and explore the cosmos, fight (or cooperate) with other players, complete missions, and more.

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Release: wip

  • Requires lwIP-CE operational as a library, which is still WIP.
CryptX
ti-84+ ce security

CryptX

A full-function cryptographic library for the TI-84+ CE allowing developers to implement NIST standards for encryption into their programs.

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Release: 2023-07-11

  • Includes a HWRNG that samples entropy from bus noise, fully documented with a proof of entropy.
  • Designed to run on a 15MHz embedded platform with extremely limited RAM and storage (under 32KB code size for most deployments).
  • Key routines written constant-time where feasible given hardware constraints. Careful use of registers and memory pools prevents stack overflows on a system with ~4000 bytes stack by default.
  • All source code is open source and developed in collaboration with the independent TI calculator development community.
BlastFIS
ti-84+ ce security

BlastFIS

Utility that validates hashes of programs, appvars and the operating system of the TI-84+ CE. Also checks the aforementioned for malware based on community-sourced malware definitions.

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Release: 2019-08-27

  • Used SHA-256 before it was re-written and optimized for CryptX.
  • Uses community-sourced malware definitions for scanning files and the OS.
  • Prone to false positives when scanning programs, appvars, and the OS as it cannot reliably distinguish between benign data patterns and actual executable structures.
CagsCalcLabs
website ti-84+ ce

CagsCalcLabs

A self-hosted site dedicated to networking, security, and development tools for the TI-84+ CE calculator. Designed, built, and maintained independently, CagsCalcLabs serves as a platform for open-source releases, documentation, and service offerings related to the platform.

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Release: n/a

  • Role: Owner, Developer
  • Stack: HTML, CSS, JS, PHP (custom), no framework dependencies
  • Hosting: Self-hosted on business-residential infrastructure with hardened server config
  • Focus: TI-84+ CE networking & security tools, documentation, and community resources
  • Design: Built from scratch with custom branding, layout, and responsive design
  • Noteworthy: Home to lwIP-CE, CryptX, BlastFIS, and other calculator-specific utilities
This is Our Story
website client

This is Our Story

Assisted with light PHP scripting, plugin configuration, and routine WordPress core + theme updates for an existing site maintained by the client.

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Release: n/a

  • Role: Support / Maintenance
CryptX Technical Whitepaper
publication ti-84+ ce security

CryptX Technical Whitepaper

A technical document offering comprehensive API documentation tailored for developers of all experience levels, alongside an in-depth analysis of the CryptX library for peer review.

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Release: 2023-07-11

  • In-depth cryptographic justification for custom algorithms used in CryptX
  • Explains and proves entropy of a hardware-derived RNG using Shannon’s formula
  • Dual-purpose: documentation for developers + validation for reviewers
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