This repository contains an alternative implementation of the Sphincs+ signature system (as of round 3 of the NIST competition
The specific features that this implements (that the reference code doesn't):
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It is multithreaded; that is, it can split the job of producing a signature over several threads
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It can support multiple parameter sets at once
It does assume that you have the AVX2 and AES_NI instructions available, as well as the Posix multithreading API - if not, well, I'll refer you to the Sphincs+ reference code...