On Debian wheezy:
# apt-get install gcc python3 python3-crypto python3-pip libffi-dev \
    python3-cffi python3-setuptools libssl-dev
# pip-3.2 install --upgrade cffi
# pip-3.2 install netifaces
# pip-3.2 install cryptography

On Debian jessie:
# apt-get install gcc python3 python3-crypto python3-pip libffi-dev \
    python3-cffi python3-setuptools libssl-dev
# pip3 install --upgrade cffi
# pip3 install netifaces
# pip3 install cryptography
