at_c

Atsign Project

February 18, 2023

C

at_c

Links

• https://github.com/JeremyTubongbanua/at_c/tree/trunk

Description

at_c is the client implementation of the atProtocol. Kind of like how you need a library to talk the HTTP protocol, you will need an atSDK to communicate in the atProtocol.

Since the atProtocol alone is not inherently useful, a client SDK is needed to do things like edge encryption, server authentication, and encapsulating the protocol in a more user-friendly manner.

This is just one of the few SDKs that I helped implement from scratch. I have also had a hand in implementing at_java, at_pico_w, and at_esp32, which are all atSDKs like at_c.

However, at_c flourished to be a more complete SDK compared to others due to customer attraction and need.

By August 2024, we were able to make our first v0.1.0 beta release.

Cryptography Features

I had the opportunity (with the help of a team) to implement low-level cryptographic features using MbedTLS as a dependency:

• RSA 2048 encrypt/decrypt
• RSA 2048 sign/verify
• AES 256 CTR encrypt/decrypt
• AES key generation
• RSA 2048 key importing
• SHA 256 hashing

atProtocol Features

I had the opportunity of implementing:

• CRUD operations
  • Put
  • Get
  • Delete
• Events
  • Notify
  • Monitor
• AtKey
  • metadata
  • to/from string
• Authentication
  • PKAM authentication

Gallery