Pip install cryptography in windows

Question

I'm get the following error when running pip install cryptography:

build\temp.win32-2.7\Release\_openssl.c(434) : fatal error C1083: Cannot open include file: 'openssl/opensslv.h': No such file or directory

I'm running windows 10, 64 bit, with python 2.7. I'm trying to install cryptography 1.9.

Answer 1

Installing openssl and changing environment variables fixed this problem for me.

• Install OpenSSL by using the installer from here: https://slproweb.com/products/Win32OpenSSL.html
• Use the Win32OpenSSL-1_1_0f, even if your system is 64 bit (I tried installing the 64 bit version of OpenSSL and this did not fix the problem)
• The following two folders should now exist: C:\OpenSSL-Win32\include, C:\OpenSSL-Win32\lib
• Open a cmd line terminal and run the following:
• > set INCLUDE=C:\OpenSSL-Win32\include;%INCLUDE%
• > set LIB=C:\OpenSSL-Win32\lib;%LIB%
• > pip install cryptography