Use pycryptodome instead of pycrypto.

[lalit-lintel]

Versions

• Python: 2.7.12
• OS: Ubuntu 18.04
• Pymodbus: 2.1.0 [twisted]
• Modbus Hardware (if used):

Pymodbus Specific

• Server: tcp - async

Description

I am trying to use Mod bus server on TCP protocol, but when I installed pymodbus and I saw it's installed pycrypto, which is deprecated and dead software.

I already have installed pycryptodome in my application, which is a conflict with pycrypto,
we can't have both pycrypto and pycryptodome at the same time,

Can we have pymodbus[twisted] release which can use pycryptodome instead of pycrypto?

[dhoomakethu]

I am not sure of the amount of effort this might need, I would be glad to accept a PR if you can give a try with pycryptodome and can assure nothing breaks.

[tracernz]

AFAICT twisted doesn't use PyCrypto? The most recent mention I can find in their repo is twisted/twisted#953

[lalit-lintel]

Added pull request with changes in the setup file, which will allow installing Cryptodome instead Crypto.

Pull request #409

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