Python-RSA

Python-RSA is a pure-Python implementation of RSA public-key cryptography. It supports key generation, encryption/decryption, and signing/verifying signatures according to PKCS#1 version 1.5. Current version is 4.9.1. The project is effectively in maintenance-only mode — the original author has publicly stated they lack time to actively maintain it, and Snyk classifies its maintenance status as Inactive. Release cadence has been irregular, with no new releases since 4.9.1.