The eXtended Keccak Code Package or XKCP gathers different free and open-source implementations of Keccak and Xoodoo-based schemes, such as the SHAKE extendable-output functions and SHA-3 hash functions, the cSHAKE, KMAC, ParallelHash and TupleHash functions, the Ketje and Keyak authenticated encryption schemes, the fast KangarooTwelve extendable-output function, the Kravatte and Xoofff deck functions, and the Xoodyak lightweight scheme.

The XKCP is organized in a way that one can easily switch between optimized implementations of the Keccak-p or Xoodoo permutations for different platforms, without touching on the higher-level code.

Written in C and in assembly, the XKCP also contains some standalone implementations in Python and Rust.

KeccakTools is a set of C++ classes that can help analyze Keccak and the related variants.

KeccakTools contains:

• the reference implementation of the Keccak-p permutations, and of most of the Keccak instances and variants, including Ketje, Keyak and Kravatte;
• the generation of optimized code for the round function of Keccak-p;
• the generation of mathematical equations underlying the operations in Keccak-p;
• a plethora of tools to analyze Keccak-p under differential and linear cryptanalysis, as used to prove lower bounds on the weight of trails.