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Reference

Lookup material.

  • Parameter set tables

    All twelve sets with every derived size — chain counts, digest field widths, and the per-component signature breakdown.

  • FIPS 205 map

    Every algorithm number in the standard, mapped to the function that implements it.

  • Further reading

    The standard, the SPHINCS+ papers, reference implementations, and the related RFCs.

Quick facts
Standard FIPS 205, August 2024
Parameter sets 12 (3 security levels × 2 hash families × s/f)
Public key 2n bytes — 32 / 48 / 64
Private key 4n bytes — 64 / 96 / 128
Signature 7,856 – 49,856 bytes
Winternitz w 16 (lg_w = 4) for every set
Signature budget up to 2^64 per key
Stateful? No — that is the SL in SLH-DSA
Pre-hash variants Defined by FIPS 205; deferred in this library

Commands

zig build                          # static library
zig build test                     # unit tests
zig build kat -- --mode keygen --vectors tests/vectors/keygen.json
zig build bench                    # benchmarks (ReleaseFast)
zig build bench -- --param-set SLH-DSA-SHAKE-128s --op sign
zig build fuzz                     # fuzz smoke; --fuzz=N for coverage-guided
zig build ctgrind                  # constant-time harnesses (run under Valgrind)
zig build examples                 # all examples
zig fmt --check .                  # format check (CI enforces)

Docs:

python3 -m venv .venv
.venv/bin/pip install -r docs/requirements.txt
.venv/bin/mkdocs serve             # http://127.0.0.1:8000