| # 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**<a name="primary-source"></a>: |
| - **Source**: https://github.com/PQClean/PQClean/commit/8e221ae797b229858a0b0d784577a8cb149d5789 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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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](#primary-source) | clean | All | All | None | False | False | False | |
| | [Primary Source](#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. |
