Fixed with a Kludge - Far from Ideal!

Hello,

I thought this a very cool tool, so I manged to get this working 'as is' with a kludge.

Long story, short - openssl has changed quite a bit in the last few years and the any recent versions break the old version of cryptography specified. I found a way of adding and linking an old (and insecure) version of openssl to the python env and the required libraries without having to disturb the up-to-date system version:

# Modified from the code at: https://github.com/pyca/cryptography/blob/master/docs/installation.rst#static-wheels
# Tested with Python2 (2.7.15+) and pip2 (18.0) current at  05 Sept 2018 

set -e

OPENSSL_VERSION="1.0.1m"
CWD=$(pwd)

pip2 install -U setuptools
pip2 install -U wheel pip
curl -O https://www.openssl.org/source/old/1.0.1/openssl-${OPENSSL_VERSION}.tar.gz
tar xvf openssl-${OPENSSL_VERSION}.tar.gz
cd openssl-${OPENSSL_VERSION}
./config no-shared -fPIC --prefix=${CWD}/openssl
make && make install
cd ..
CFLAGS="-I${CWD}/openssl/include" LDFLAGS="-L${CWD}/openssl/lib" pip2 wheel --no-binary :all: 
  cryptography==1.1.2 argh==0.26.1 backports-abc==0.4 backports.ssl-match-hostname==3.5.0.1 
  blinker==1.4 certifi==2016.2.28 cffi==1.5.2 click==6.2 ConfigArgParse==0.10.0 construct==2.5.2 
  enum34==1.1.2 futures==3.0.5 hpack==2.0.1 html2text==2015.11.4 idna==2.0 ipaddress==1.0.16 
  lxml==3.4.4 mitmproxy==0.15 ndg-httpsclient==0.4.0 netlib==0.15.1 passlib==1.6.5 pathtools==0.1.2 
  Pillow==3.0.0 pyasn1==0.1.9 pycparser==2.14 pyOpenSSL==0.15.1 pyparsing==2.0.7 
  pyperclip==1.5.26 PyYAML==3.11 requests==2.9.1 requests-futures==0.9.7 singledispatch==3.4.0.3 
  six==1.10.0 tornado==4.3 urwid==1.3.1 watchdog==0.8.3 wheel==0.24.0

This compiles and links everything together and creates a bunch of .whl (wheel) files in the installation directory as a side effect - run this instead of step 4 in the setup instructions.

As it is not really a proper fix, I haven't forked it into the code. Just left it here on an 'as is' basis. Note that you must only use this fix in a Python env so as not to replace your system SSL library with an old insecure one!

When I have some time, I might try getting this running with the most recent consistent versions of all the libraries in requirements.txt such that the current system installed versions of openssl works (this will likely need a few changes to the code). If I have any success with that, I will look at forking into the code.

Cheers.

Start with requirements.txt and the setup instructions, especially step 4; reproduce the Python 2 dependency build against a current system OpenSSL. Compare the pinned cryptography and related packages with compatible versions, then verify installation and tool startup without the old OpenSSL workaround.