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   Ryan Castellucci :nonbinary_flag: (ryanc@infosec.exchange)'s status on Sunday, 12-Nov-2023 00:24:15 JST Ryan Castellucci :nonbinary_flag:

   Several of my personal projects should probably say:

   WARNING: This source code contains techniques which are known to the State of California to cause cancer.

   My cryptographic hash library does approximately the following to build, via a makefile:

   • Uses a bunch of make functions to generate target lists for wildcard recipes.
   • Run the Python scripts that generate a series of header files full of macros.
   • Runs the C preprocessor on meta-implementations of Merkel-Damgård hash functions once for each algorithm.
   • Concatenates some of the files together so the compiler can inline them better.
   • Compiles the files (a second pass of the preprocessor runs).
   • Links everything together.

   To the best of my knowledge, it's the fastest non-parallel x86_64 implementation of all the hash algorithms it supports, and it allows for building things like length extension attacks.