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54 lines
5.5 KiB
Markdown
54 lines
5.5 KiB
Markdown
# HQC
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- **Algorithm type**: Key encapsulation mechanism.
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- **Main cryptographic assumption**: Syndrome decoding of structure codes (Hamming Quasi-Cyclic).
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- **Principal submitters**: Carlos Aguilar Melchor, Nicolas Aragon, Slim Bettaieb, Olivier Blazy, Jurjen Bos, Jean-Christophe Deneuville, Philippe Gaborit, Edoardo Persichetti, Jean-Marc Robert, Pascal Véron, Gilles Zémor, Loïc Bidoux.
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- **Authors' website**: https://pqc-hqc.org/
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- **Specification version**: NIST Round 3 submission.
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- **Primary Source**<a name="primary-source"></a>:
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- **Source**: https://github.com/PQClean/PQClean/commit/6a32796212b79a5f9126d0a933e1216313f50c16
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- **Implementation license (SPDX-Identifier)**: Public domain
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, which takes it from:
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- https://github.com/jschanck/package-pqclean/tree/29f79e72/hqc, which takes it from:
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- submission 2020-10-01 at https://pqc-hqc.org/implementation.html
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## Parameter set summary
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| Parameter set | Security model | Claimed NIST Level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) |
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|:---------------:|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:|
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| HQC-128 | IND-CCA2 | 1 | 2249 | 2289 | 4481 | 64 |
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| HQC-192 | IND-CCA2 | 3 | 4522 | 4562 | 9026 | 64 |
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| HQC-256 | IND-CCA2 | 5 | 7245 | 7285 | 14469 | 64 |
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## HQC-128 implementation characteristics
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| 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?‡ |
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|:---------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:----------------------|
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| [Primary Source](#primary-source) | clean | All | All | None | True | True | False |
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| [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI1,PCLMULQDQ | False | True | False |
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Are implementations chosen based on runtime CPU feature detection? **Yes**.
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‡For an explanation of what this denotes, consult the [Explanation of Terms](#explanation-of-terms) section at the end of this file.
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## HQC-192 implementation characteristics
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| 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? |
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|:---------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:---------------------|
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| [Primary Source](#primary-source) | clean | All | All | None | True | True | False |
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| [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI1,PCLMULQDQ | False | True | False |
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Are implementations chosen based on runtime CPU feature detection? **Yes**.
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## HQC-256 implementation characteristics
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| 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? |
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|:---------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:---------------------|
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| [Primary Source](#primary-source) | clean | All | All | None | True | True | False |
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| [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI1,PCLMULQDQ | False | True | True |
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Are implementations chosen based on runtime CPU feature detection? **Yes**.
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## Explanation of Terms
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- **Large Stack Usage**: Implementations identified as having such may cause failures when running in threads or in constrained environments. |