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This repository contains the software that accompanies the SPHINCS+ submission to NIST's Post-Quantum Cryptography project.

The SPHINCS+ specification proposed a set of 18 named instances, specifying hash functions and concrete parameters for the security level, tree dimensions, WOTS+ and FORS. This reference implementation allows for more flexibility, as parameters can be specified in a params.h file. The proposed parameter sets have been predefined in ref/params/params-*.h, and the hash function can be varied by linking with the different implementations of hash.h, i.e. hash_haraka.c, hash_sha256.c and hash_shake256.c. See the table below for a summary of the parameter sets. These parameters target the NIST security categories 1, 3 and 5; for each category, there is a parameter set geared towards either small signatures or fast signature generation.

For the instances that use SHA-256, we rely on OpenSSL. If you want to use hash_sha256.c, make sure to install the OpenSSL development headers. On Debian-based systems, this is achieved by installing the OpenSSL development package libssl-dev.

All included code is available under the CC0 1.0 Universal Public Domain Dedication, with the exception of rng.c, rng.h and PQCgenKAT_sign.c, which were provided by NIST.