add ability to submit factors.

[connectety]

closes #12

Please also note there is:
https://github.com/RsaCtfTool/RsaCtfTool/blob/master/lib/fdb.py

I did not use or reference this, because its license might not be compatible with the MIT license of this project. And I also thought it might be faster to just write the code than reading licensing rules.

Tests

While trying to crack RSA keys, I often noticed even small numbers not being solved.
I think they could make for good tests.

I decided on 1024 because it used to be a commonly used RSA size.
Atfirst I used 2048, but it had some performance issues with generating the keys.

Todo

• pycryptodome requirement for development.
• should we do anything with the response.
• should we check the factors before submitting the values?
• submit_factors as static member, normal member or standalone function?
• are f-strings ok, or do we support some python versions older than 3.6?

[connectety]

I'm basically looking for feedback regarding the 4 open todos.