# 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-20191221. - **Primary Source**: - **Source**: https://github.com/PQClean/PQClean/commit/4c9e5a3aa715cc8d1d0e377e4e6e682ebd7602d6 - **Implementation license (SPDX-Identifier)**: Public domain , which takes it from: - SUPERCOP-20191221 "vec" and "avx" implementations ## Parameter set summary | Parameter set | Security model | Claimed NIST Level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) | |:-------------------------:|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:| | Classic-McEliece-348864 | IND-CCA2 | 1 | 261120 | 6452 | 128 | 32 | | Classic-McEliece-348864f | IND-CCA2 | 1 | 261120 | 6452 | 128 | 32 | | Classic-McEliece-460896 | IND-CCA2 | 3 | 524160 | 13568 | 188 | 32 | | Classic-McEliece-460896f | IND-CCA2 | 3 | 524160 | 13568 | 188 | 32 | | Classic-McEliece-6688128 | IND-CCA2 | 5 | 1044992 | 13892 | 240 | 32 | | Classic-McEliece-6688128f | IND-CCA2 | 5 | 1044992 | 13892 | 240 | 32 | | Classic-McEliece-6960119 | IND-CCA2 | 5 | 1047319 | 13908 | 226 | 32 | | Classic-McEliece-6960119f | IND-CCA2 | 5 | 1047319 | 13908 | 226 | 32 | | Classic-McEliece-8192128 | IND-CCA2 | 5 | 1357824 | 14080 | 240 | 32 | | Classic-McEliece-8192128f | IND-CCA2 | 5 | 1357824 | 14080 | 240 | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,BMI1,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,BMI1,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,BMI1,POPCNT | False | True | 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT | False | True | True | Are implementations chosen based on runtime CPU feature detection? **Yes**. *Note: This algorithm is known to fail memory leak testing on x86_64.* ## 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) | vec | All | All | None | True | True | True | | [Primary Source](#primary-source) | avx | x86\_64 | Linux,Darwin | AVX2,POPCNT,BMI1 | False | True | 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.