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README.md

SPHINCS+

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

Parameters

The SPHINCS+ specification proposed a set of 36 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, as well as different implementations of thash.h, i.e., *_robust.c and *_simple.c. This is demonstrated in the Makefile. 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.

n h d log(t) k w bit security pk bytes sk bytes sig bytes
SPHINCS+-128s 16 63 7 12 14 16 133 32 64 7,856
SPHINCS+-128f 16 66 22 6 33 16 128 32 64 17,088
SPHINCS+-192s 24 63 7 14 17 16 193 48 96 16,224
SPHINCS+-192f 24 66 22 8 33 16 194 48 96 35,664
SPHINCS+-256s 32 64 8 14 22 16 255 64 128 29,792
SPHINCS+-256f 32 68 17 9 35 16 255 64 128 49,856

License

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.

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The SPHINCS+ reference code, accompanying the submission to NIST's Post-Quantum Cryptography project

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