| # Classic McEliece |
| |
| - **Algorithm type**: Key encapsulation mechanism. |
| - **Main cryptographic assumption**: Niederreiter's dual version of McEliece's public key encryption using binary Goppa codes. |
| - **Principal submitters**: Daniel J. Bernstein, Tung Chou, Tanja Lange, Ingo von Maurich, Rafael Misoczki, Ruben Niederhagen, Edoardo Persichetti, Christiane Peters, Peter Schwabe, Nicolas Sendrier, Jakub Szefer, Wen Wang. |
| - **Authors' website**: https://classic.mceliece.org |
| - **Specification version**: SUPERCOP-20221025. |
| - **Primary Source**<a name="primary-source"></a>: |
| - **Source**: https://github.com/PQClean/PQClean/commit/8e221ae797b229858a0b0d784577a8cb149d5789 |
| - **Implementation license (SPDX-Identifier)**: Public domain |
| - **Ancestors of primary source**: |
| - SUPERCOP-20221025 "clean" and "avx2" implementations |
| |
| ## Advisories |
| |
| - Classic-McEliece-460896, Classic-McEliece-460896f, Classic-McEliece-6960119, and Classic-McEliece-6960119f parameter sets fail memory leak testing on x86-64 when building with ``clang`` using optimization level ``-O2`` and ``-O3``. Care is advised when using the algorithm at higher optimization levels, and any other compiler and architecture. |
| - Current implementation of the algorithm may not be constant-time. Additionally, environment specific constant-time leaks may not be documented; please report potential constant-time leaks when found. |
| |
| ## Parameter set summary |
| |
| | Parameter set | Parameter set alias | Security model | Claimed NIST Level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) | |
| |:-------------------------:|:----------------------|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:| |
| | Classic-McEliece-348864 | NA | IND-CCA2 | 1 | 261120 | 6492 | 96 | 32 | |
| | Classic-McEliece-348864f | NA | IND-CCA2 | 1 | 261120 | 6492 | 96 | 32 | |
| | Classic-McEliece-460896 | NA | IND-CCA2 | 3 | 524160 | 13608 | 156 | 32 | |
| | Classic-McEliece-460896f | NA | IND-CCA2 | 3 | 524160 | 13608 | 156 | 32 | |
| | Classic-McEliece-6688128 | NA | IND-CCA2 | 5 | 1044992 | 13932 | 208 | 32 | |
| | Classic-McEliece-6688128f | NA | IND-CCA2 | 5 | 1044992 | 13932 | 208 | 32 | |
| | Classic-McEliece-6960119 | NA | IND-CCA2 | 5 | 1047319 | 13948 | 194 | 32 | |
| | Classic-McEliece-6960119f | NA | IND-CCA2 | 5 | 1047319 | 13948 | 194 | 32 | |
| | Classic-McEliece-8192128 | NA | IND-CCA2 | 5 | 1357824 | 14120 | 208 | 32 | |
| | Classic-McEliece-8192128f | NA | IND-CCA2 | 5 | 1357824 | 14120 | 208 | 32 | |
| |
| ## Classic-McEliece-348864 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | False | True | |
| |
| 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. |
| |
| ## Classic-McEliece-348864f 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-460896 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-460896f 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-6688128 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-6688128f 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-6960119 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-6960119f 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-8192128 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | False | True | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Classic-McEliece-8192128f 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 | True | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | False | True | |
| |
| 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. |
