[pyOpenSSL] Does PKey.generate_key lock the GIL?

[Tobias O. <tob...@ta...>]

I am using PyOpenSSL from within Twisted and want to generate new keys without blocking the Twisted networking.

To do so, I use the deferToThread() Twisted feature, which runs functions on a thread from a background thread pool.

However,

PKey.generate_key

still seems to block everything.

Does above function lock the GIL?