CryptoLib

A C++ Wrapper to mbedtls encryption modes. Starts with minimal implementation supports the following:

This library interfaces to mbedtls functions, in a C++ way: using std::array and std::vector for keys and messages.

Currently, The supported key size is 128-bits. (Any idea to abstract it?)

CBC and CMAC are used altogether for LoRaWAN protocol. These modes (CBC and CMAC) are developed for securing a custom protocol.

The aim for sharing this library beside saving time, is to help C++ programmers from stopping C-style code from (bleeding into) their codes.

How to use it?

You should install mbedtls library.
Replace the default \include\mbedtls\config.h file with provided config.h file.

It currently supported on all Arduino platforms. ESP8266, ESP32 with more advance features than other. It's supported on STM32CubeIDE (See below).

If you have different platform, It's not hard to add your customization to platform.h and platform.cpp, which should include:

CRYPTOLIB_PRINTF definition support (if used debugging)
Crypto_getClock() definition to a high clock speed function, used as entropy source.
You can define your own entropy source by defining uint32_t getRandomNumber(int seed) into your skecth.

For the library to work properly, It's important to activate the Cycle Counter DWT by calling cycleCounterInit() at the beginning of your skecth.

The current alpha design for the library is:

Maintaining Crypto.h to have all encryption/decryption interfaces inside CryptoLib namespace.
Uses separate files for separate functionalities: cmac, random, platform, Crypto ... Any suggestion for a better heirarcy, please share with us.
to use std::array<> and std::vector<> in the interfaces.
Uses platform.h and platform.cpp for portability of the library to other hardware platforms.