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How to Mock an mTLS Client Certificate in Python

Create a self-signed client certificate and key with OpenSSL, load them into an SSL context, and simulate an mTLS handshake in Python for testing.

mtls ssl certificates

Python

import ssl
import socket
import subprocess
import tempfile
from pathlib import Path

def create_mock_certificates():
    """Generate self-signed client certificate and key for mTLS testing."""
    with tempfile.TemporaryDirectory() as tmpdir:
        cert_path = Path(tmpdir) / "client.crt"
        key_path = Path(tmpd…

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