Revert "Start migration to Pycryptodome"
This reverts commit eec9b6a81f2b9ba1fc13a68b21dbaf0699da2637.
Unfortunately, pycryptodome isn't a replacement for pycrypto as
advertised. The API is slightly different and requires alot of
adjustments.
We'll have to go with cryptography.io/
Especiall important is the following warning there:
This is a “Hazardous Materials” module. You should ONLY use it if you’re
100% absolutely sure that you know what you’re doing because this module
is full of land mines, dragons, and dinosaurs with laser guns.