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pqcrypto/README.md

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# PQ Crypto Catalog
Implementation of quantum-safe signature and KEM schemes submitted to NIST PQC Standardization Process.
The goal is to provide an easy-to-use API in C and Rust to enable experimentation. The code is derived from the submission to the NIST Post-Quantum Standardization, either directly or by leveraging [PQClean](https://github.com/PQClean/PQClean) project.
Users shouldn't expect any level of security provided by this code. The library is not meant to be used on live production systems.
## Schemes support
| Name | NIST Round | x86 optimized |
|--------------------------|------------|---------------|
| Kyber | 3 | x |
| NTRU | 3 | x |
| SABER | 3 | x |
| FrodoKEM | 3 | |
| NTRU Prime | 3 | x |
| HQC-RMRS | 3 | x |
| Dilithium | 3 | x |
| Falcon | 3 | |
| Rainbow | 3 | |
| SPHINCS+ SHA256/SHAKE256 | 3 | x |
| SIKE/p434 | 3 | x |
## Building
CMake is used to build the library:
```bash
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make
```
Build outputs two libraries, a static ``libpqc_s.a`` and dynamic ``libpqc.so``, which can be linked with a project.
## API
Library provides simple API, wrapping PQClean. For example to use KEM, one should call the library in following way:
```c
#include <pqc/pqc.h>
const params_t *p = pqc_kem_alg_by_id(KYBER512);
std::vector<uint8_t> ct(ciphertext_bsz(p));
std::vector<uint8_t> ss1(shared_secret_bsz(p));
std::vector<uint8_t> ss2(shared_secret_bsz(p));
std::vector<uint8_t> sk(private_key_bsz(p));
std::vector<uint8_t> pk(public_key_bsz(p));
pqc_keygen(p, pk.data(), sk.data());
pqc_kem_encapsulate(p, ct.data(), ss1.data(), pk.data());
pqc_kem_decapsulate(p, ss2.data(), ct.data(), sk.data());
p = pqc_sig_alg_by_id(DILITHIUM2);
size_t sigsz = sig.capacity();
pqc_keygen(p, pk.data(), sk.data());
pqc_sig_create(p, sig.data(), &sigsz, msg.data(), msg.size(), sk.data());
pqc_sig_verify(p, sig.data(), sig.size(), msg.data(), msg.size(), pk.data());
```
See test implemetnation in ``test/ut.cpp`` for more details.
## Rust binding
Rust bindgings are provided in the ``src/rustapi/pqc-sys`` and can be regenerated automatically by running ``cargo build`` in that directory.
## Testing against Known Answer Tests
Algorithms are tested against KATs, by the Rust-based runner implemented in the ``test/katrunner`` (only verification/decpaulation). The runner uses ``katwalk`` crate for parsing NIST format. To run it:
```bash
cd test/katrunner
curl http://amongbytes.com/~flowher/permalinks/kat.zip --output kat.zip
unzip kat.zip
cargo run -- --katdir KAT
```