Embedded Cryptography Library

This repository contains cryptographic algorithms for the ESP8266 and ESP32.

The documentation contains more information on the libraries and examples.

This library was originally created by Rhys Weatherley.

Changes in this fork

• Support for the following has been removed:
  • AES
  • OMAC
  • SHA224
  • SHA3
  • SHA384
• The RNG code has been significantly simplified

Recent significant changes to the library

Jan 2022:

• All-in-one hmac() function in Hash.h for simplified HMAC computations.
• New API for the HKDF hash-based key derivation function.
• Make the ESP32 version of AES less dependent on include file locations.

Apr 2018:

• Acorn128 and Ascon128 authenticated ciphers (finalists in the CAESAR AEAD competition in the light-weight category).
• Split the library into Crypto (core), CryptoLW (light-weight), and CryptoLegacy (deprecated algorithms).
• Tiny and small versions of AES for reducing memory requirements.
• Port the library to ESP8266 and ESP32.
• Make the RNG class more robust if the app doesn't call begin() or loop().

Nov 2017:

• Fix the AVR assembly version of Speck and speed it up a little.
• API improvements to the RNG class.