CURLOPT_SSL_CTX_FUNCTION(3) on macOS
The text 234ab9652798, as macOS 11.5, macOS 11.4, macOS 11.3, macOS 11.2, macOS 11.1, macOS 11.0.1, macOS 10.15.6, macOS 10.15.5, macOS 10.15.4, macOS 10.15.3, macOS 10.15.2, macOS 10.15.1, macOS 10.15 shipped it.
SSL context callback for OpenSSL, wolfSSL/CyaSSL or mbedTLS