Finally fixed this issue. As it turns out, this was fixed in the develop 
branch of PyInstaller via this 
<https://github.com/pyinstaller/pyinstaller/blob/develop/PyInstaller/hooks/hook-cryptography.py>
 
file addition. All I had to do was uninstall PyInstaller via pip and 
reinstall by cloning the repo and manually installing. After that the 
following command produced an executable that ran with no errors:
$ pyinstaller --onefile testcase.py

The only thing that still bothers me is that the master branch is a year 
old already.

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