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Cython bindings to the Keccak sponge and SHA-3 functions

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From the Keccak website:

Keccak is a family of sponge functions. The sponge function is a generalization of the concept of cryptographic hash function with infinite output and can perform quasi all symmetric cryptographic functions, from hashing to pseudo-random number generation to authenticated encryption.

cykeccak is a thin Cython wrapper around the reference implementation of Keccak and an implementation of SHA-3 on top of that wrapper.


Cython is not required to build cykeccak as long as the source distribution contains a keccak.c file, such as the tarballs available from pypi. Installing from a github tarball is not recommended, as they ship without keccak.c, version.txt, or a .git directory. With neither version.txt nor a git repository present, will be unable to determine the version of cykeccak.

The underlying C code is architechture-dependent, and will attempt to guess whether to build from the 32-bit or 64-bit sources based on whether the python executing is a 32- or 64-bit binary. To avoid guessing, the CYKECCAK_IMPLEMENTATION environment variable can also be set to either opt32 or opt64.

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