pypqc 0.1.0.dev4

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Usage

Development version. You need a C compiler first.

Simply install from PyPI with

pip install --pre "pypqc[falcon,hqc,kyber]"

or see “Development” below if you want to tinker on the codebase!

(If you are a stickler for libre software, you can leave off the bracketed bit in the above command to install only the subset of libraries available under OSI-approved licenses.)

KEMs

McEliece, Kyber, and HQC are currently provided, all with the same easy-to-use interface:

# Available: hqc_128, hqc_192, hqc_256,
# kyber512, kyber768, kyber1024,
# mceliece348864, mceliece460896,
# mceliece6688128, mceliece6960119, mceliece8192128
from pqc.kem import mceliece6960119 as kemalg

# 1. Keypair generation
pk, sk = kemalg.keypair()

# 2. Key encapsulation
kem_ct, ss = kemalg.encap(pk)

# 3. Key de-encapsulation
ss_result = kemalg.decap(kem_ct, sk)
assert ss_result == ss

Capabilities not included in PQClean, such as McEliece signatures, Hybrid Encryption (KEM-TRANS), and message encapsulation, are not going to be implemented in this library as they’re all either higher-level constructions that could be implemented using this library, or are lower-level constructions that would require a serious cryptographic implementation effort.

*Exception: McEliece w/ Plaintext Confirmation is on the agenda for inclusion even if upstream ultimately decides to exclude it.

Signature Algorithms

SPHINCS+, Dilithium, and Falcon are provided, all with the same easy-to-use interface:

# Available: dilithium2, dilithium3, dilithium5,
# falcon_512, falcon_padded_512, falcon_1024, falcon_padded_1024,
# sphincs_sha2_128f_simple, sphincs_sha2_128s_simple,
# sphincs_shake_128f_simple, sphincs_shake_128s_simple,
# sphincs_sha2_192f_simple, sphincs_sha2_192s_simple,
# sphincs_shake_192f_simple, sphincs_shake_192s_simple,
# sphincs_sha2_256f_simple, sphincs_sha2_256s_simple,
# sphincs_shake_256f_simple, sphincs_shake_256s_simple
from pqc.sign import sphincs_shake_256s_simple as sigalg

# 1. Keypair generation
pk, sk = sigalg.keypair()

# 2. Signing
# (detached signature)
sig = sigalg.sign(MY_MESSAGE, sk)

# 3. Signature verification
# (Returns None on success; raises ValueError on failure.)
sigalg.verify(sig, MY_MESSAGE, pk)

Regarding SPHINCS+: the Simple version is included; the Robust version is is not; SHA256 and SHAKE256 are included; Haraka is not. See https://github.com/PQClean/PQClean/discussions/548#discussioncomment-8565116 for more information.

Regarding Falcon: the Compressed and Padded versions are included, and are able to verify() each others’ signatures. The CT version is not currently planned for support in any capacity, even verification.

Development

This package is developed as part of a Monorepo.

See https://github.com/James-E-A/pypqc/tree/rewrite/2024-08-23 for development instructions and details.