| # HQC |
| |
| - **Algorithm type**: Key encapsulation mechanism. |
| - **Main cryptographic assumption**: Syndrome decoding of structure codes (Hamming Quasi-Cyclic). |
| - **Principal submitters**: Carlos Aguilar Melchor, Nicolas Aragon, Slim Bettaieb, Loïc Bidoux, Olivier Blazy, Jurjen Bos, Jean-Christophe Deneuville, Arnaud Dion, Philippe Gaborit, Jérôme Lacan, Edoardo Persichetti, Jean-Marc Robert, Pascal Véron, Gilles Zémor. |
| - **Authors' website**: https://pqc-hqc.org/ |
| - **Specification version**: 2023-04-30. |
| - **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**: |
| - https://github.com/SWilson4/package-pqclean/tree/8db1b24b/hqc, which takes it from: |
| - submission 2023-04-30 at https://pqc-hqc.org/implementation.html |
| |
| ## 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) | |
| |:---------------:|:----------------------|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:| |
| | HQC-128 | NA | IND-CCA2 | 1 | 2249 | 2305 | 4433 | 64 | |
| | HQC-192 | NA | IND-CCA2 | 3 | 4522 | 4586 | 8978 | 64 | |
| | HQC-256 | NA | IND-CCA2 | 5 | 7245 | 7317 | 14421 | 64 | |
| |
| ## HQC-128 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 | 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. |
| |
| ## HQC-192 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 | True | True | False | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## HQC-256 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 | 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. |
