SPHINCS+

  • Algorithm type: Digital signature scheme.
  • Main cryptographic assumption: hash-based signatures.
  • Principal submitters: Andreas Hülsing.
  • Auxiliary submitters: Jean-Philippe Aumasson, Daniel J. Bernstein,, Ward Beullens, Christoph Dobraunig, Maria Eichlseder, Scott Fluhrer, Stefan-Lukas Gazdag, Panos Kampanakis, Stefan Kölbl, Tanja Lange, Martin M. Lauridsen, Florian Mendel, Ruben Niederhagen, Christian Rechberger, Joost Rijneveld, Peter Schwabe, Bas Westerbaan.
  • Authors’ website: https://sphincs.org/
  • Specification version: NIST Round 3 submission, v3.1 (June 10, 2022).
  • Primary Source:
    • Source: https://github.com/PQClean/PQClean/commit/1eacfdafc15ddc5d5759d0b85b4cef26627df181 with copy_from_upstream patches
    • Implementation license (SPDX-Identifier): CC0-1.0

Advisories

  • This algorithm is not tested under Windows.

Parameter set summary

Parameter set Parameter set alias Security model Claimed NIST Level Public key size (bytes) Secret key size (bytes) Signature size (bytes)
SPHINCS+-SHA2-128f-simple NA EUF-CMA 1 32 64 17088
SPHINCS+-SHA2-128s-simple NA EUF-CMA 1 32 64 7856
SPHINCS+-SHA2-192f-simple NA EUF-CMA 3 48 96 35664
SPHINCS+-SHA2-192s-simple NA EUF-CMA 3 48 96 16224
SPHINCS+-SHA2-256f-simple NA EUF-CMA 5 64 128 49856
SPHINCS+-SHA2-256s-simple NA EUF-CMA 5 64 128 29792
SPHINCS+-SHAKE-128f-simple NA EUF-CMA 1 32 64 17088
SPHINCS+-SHAKE-128s-simple NA EUF-CMA 1 32 64 7856
SPHINCS+-SHAKE-192f-simple NA EUF-CMA 3 48 96 35664
SPHINCS+-SHAKE-192s-simple NA EUF-CMA 3 48 96 16224
SPHINCS+-SHAKE-256f-simple NA EUF-CMA 5 64 128 49856
SPHINCS+-SHAKE-256s-simple NA EUF-CMA 5 64 128 29792

SPHINCS+-SHA2-128f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?‡
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

‡For an explanation of what this denotes, consult the Explanation of Terms section at the end of this file.

SPHINCS+-SHA2-128s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHA2-192f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHA2-192s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHA2-256f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHA2-256s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-128f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-128s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-192f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-192s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-256f-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

SPHINCS+-SHAKE-256s-simple implementation characteristics

Implementation source Identifier in upstream Supported architecture(s) Supported operating system(s) CPU extension(s) used No branching-on-secrets claimed? No branching-on-secrets checked by valgrind? Large stack usage?
Primary Source clean All All None False False False
Primary Source avx2 x86_64 Linux,Darwin AVX2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

Explanation of Terms

  • Large Stack Usage: Implementations identified as having such may cause failures when running in threads or in constrained environments.

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