pyOpenSSL is a mature, high-level Python library that acts as a thin wrapper around a subset of the OpenSSL cryptographic library. Managed by the Python Cryptographic Authority (PyCA), it allows developers to build secure, SSL/TLS-aware networking applications and handle legacy certificate operations directly within Python. Core Capabilities
TLS/SSL Connections: It includes SSL.Connection objects that seamlessly wrap Python’s portable network sockets to establish secure handshakes.
Python Callbacks: You can write custom verification, handshake, and cookie-handling callbacks entirely in Python.
Error Handling: It features a robust error-handling subsystem that directly mirrors OpenSSL’s native error codes.
Legacy Cryptography: It handles certificates (X509), requests (X509Req), and keys (PKey), though these specific APIs are mostly kept for backward compatibility. Critical Architectural Shift: pyOpenSSL vs. Cryptography
While pyOpenSSL was originally created because Python’s standard ssl module was deeply limited, its role has fundamentally changed. Today, pyOpenSSL is a pure-Python library built on top of PyCA’s lower-level cryptography package, which handles the actual bindings to OpenSSL.
Because of this, PyCA issues a strict architectural recommendation: pyca/pyopenssl: A Python wrapper around the OpenSSL library
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