PQGo

WARNING: Experimental code, don't use in production or for anything that matters.

PQGo is a cgo wrapper around post-quantum cryptography primitives, based on the API of the NIST competition.

Currently PQGo includes the following primitives

• Dilithium (signature)

  • Version III (NIST level 2)
  • Public key: 1472 bytes
  • Secret key: 3504 bytes
  • Signature: 2701 bytes

• Kyber (KEM)

  • Version: Kyber768 (161/178 pq/classical security)
  • Public key: 1088 bytes
  • Secret key: 2400 bytes
  • Ciphertext: 1152 bytes
  • Shared secret: 32 bytes

• Round5 (KEM)

  • Version: 3KEMb (182/192 pq/classical security)
  • Public key: 780 bytes
  • Secret key: 24 bytes
  • Ciphertext: 830
  • Shared secret: 24 bytes

Disclaimer: The choice of these primitives should not be interpreted as an endorsement or recommendation. We are not liable for any damage etc. etc. We made some tweaks to the original C code, so if something is wrong there it may be our fault, not that of the original implementers.

Usage

To download the package to your local Go installation, run

go get -u -v github.com/Teserakt-io/PQGo/...

Note that PQGo uses Go's recently introduced modules (see go.mod). To use PQGo, add the following import to your package:

import "github.com/Teserakt-io/PQGo"

(Warning: Go modules seem to be case sensitive.)

Go will then download the module of the latest master version, e.g. by doing go get -u ./....

Benchmarks can be run with justbench.sh. Note however that the underlying C code is the reference implementation, which may be considerably slower than optimized implementations.

Calling the algorithm from another package requires to import the package, instantiate a primitive, and call its methods. For example, to generate a Dilithium key pair:

import "github.com/Teserakt-io/PQGo"

(...)

d := pqgo.Dilithium{}
pk, sk, err := d.KeyGenRandom()

Usage is generally straightforward, based on the examples in pqgo_test.go. PQGo uses the following interfaces, for KEM and signature primitives:

type KEM interface {
	KeyGen(ent []byte) ([]byte, []byte, error)
	KeyGenRandom() ([]byte, []byte, error)
	Encap(ent, pk []byte) ([]byte, []byte, error)
	EncapRandom(pk []byte) ([]byte, []byte, error)
	Decap(ct, sk []byte) ([]byte, error)
}

type Signature interface {
	KeyGen(ent []byte) ([]byte, []byte, error)
	KeyGenRandom() ([]byte, []byte, error)
	Sign(m, sk []byte) ([]byte, error)
	Open(sm, pk []byte) ([]byte, error)
}

Adding other primitives

Adding new primitives requires to extend the NIST API with deterministic version of the key generation and encapsulation algorithms (see the *_cgo() C functions that we added to the original code). Other tweaks may be needed to adapt the code to cgo.

Unit tests use the "golden" trick (as used in the standard library) to verify test values. If you add a new primitive, make sure to add corresponding unit tests as well as golden files matching the test vectors of the C implementation.

IP

The copyright of the C implementations belongs to their respective authors:

• Dilithium ("public domain" licensing)
• Kyber ("public domain" licensing)
• Round5 (restrictive license)

The Go code is copyright (c) Teserakt AG, 2018, and hereby released under GPLv2.