oqs-provider
An OpenSSL 3 provider from the Open Quantum Safe project that exposes quantum-safe KEMs and signatures, under the MIT licence.
Why this is listed
Its only purpose is exposing quantum-safe KEMs and signatures through OpenSSL, published as MIT source, which is the test here rather than the project's own testing-vehicle framing.
The repository states that it contains code to enable quantum-safe cryptography in a standard OpenSSL distribution by way of a single shared library, the OQS provider. It states that the provider covers KEM key establishment in TLS 1.3, including management of those keys through the OpenSSL 3 provider interface and hybrid KEM schemes, and that quantum-safe signatures are available through the EVP interface with CMS and CMP functionality alongside. Its listed algorithms include BIKE, FrodoKEM, HQC and ML-KEM for key establishment, and ML-DSA, Falcon, MAYO and CROSS for signatures.
A test vehicle, in the project's own words
The README states that oqsprovider is primarily meant as a vehicle to enable testing of experimental post-quantum cryptography, with no intention of duplicating the work going into production-quality post-quantum cryptography in OpenSSL's own default provider. That is the project describing its own scope, and it belongs in any decision to deploy it.
Sources
Checked against these sources on Sep 4, 2026. Listing is not endorsement, and nothing here is ranked or scored.