How do I install PyCrypto on Windows

Question

I ve read every other google source and SO thread  with nothing working   Python 2 7 3 32bit installed on Windows 7 64bit  Download  extracting  and then trying to install PyCrypto results in  Unable to find vcvarsall bat    So I install MinGW and tack that on the install line as the compiler of choice  But then I get the error  RuntimeError  chmod error    How in the world do I get around this  I ve tried using pip  which gives the same result  I found a prebuilt PyCrypto 2 3 binary and installed that  but it s nowhere to be found on the system  not working    Any ideas

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For those of you looking for python 3 4 I found a git repo with an installer that just works  Here are the direct links for x64 and x32

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If you are on Windows and struggling with installing Pycrypcto just use the  pip install pycryptodome  It works like a miracle and it will make your life much easier than trying to do a lot of configurations and tweaks

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My answer might not be related to problem mention here  but I had same problem with Python 3 4 where Crypto Cipher wasn t a valid import  So I tried installing PyCrypto and went into problems   After some research I found with 3 4 you should use pycryptodome   I install pycryptodome using pycharm and I was good   from Crypto Cipher import AES

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For VS2010   SET VS90COMNTOOLS  VS100COMNTOOLS    For VS2012   SET VS90COMNTOOLS  VS110COMNTOOLS    then Call   pip install pyCrypto

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For Windows 7   To install Pycrypto in Windows   Try this in Command Prompt   Set path C  Python27 Scripts  i e path where easy install is located   Then execute the following   easy install pycrypto  For Ubuntu   Try this   Download Pycrypto from  https   pypi python org pypi pycrypto   Then change your current path to downloaded path using your terminal and user should be root   Eg  root xyz-virtual-machine   pycrypto-2 6 1   Then execute the following using the terminal   python setup py install  It s worked for me  Hope works for all

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Try just using   pip install pycryptodome   or   pip install pycryptodomex   Source  https   pypi python org pypi pycryptodome

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Step 1  Install Visual C   2010 Express from  here     Do not install Microsoft Visual Studio 2010 Service Pack 1     Step 2  Remove all the Microsoft Visual C   2010 Redistributable packages from Control Panel Programs and Features  If you don t do those then the install is going to fail with an obscure  Fatal error during installation  error   Step 3  Install offline version of Windows SDK for Visual Studio 2010  v7 1  from here  This is required for 64bit extensions  Windows has builtin mounting for ISOs like Pismo    Step 4  You need to install the ISO file with Pismo File Mount Audit Package  Download Pismo from here   Step 5  Right click the downloaded ISO file and choose mount with Pismo  Thereafter  install the Setup SDKSetup exe instead of setup exe   Step 6a  Create a vcvars64 bat file in C  Program Files  x86  Microsoft Visual Studio 10 0 VC bin amd64 by changing directory to C  Program Files  x86  Microsoft Visual Studio version VC  on the command prompt  Type command on the command prompt  cd C  Program Files  x86  Microsoft Visual Studio version VC r   Step 6b  To configure this Command Prompt window for 64-bit command-line builds that target x86 platforms  at the command prompt  enter  vcvarsall x86 Click here for more options    Step 7  At the command prompt  install the PyCrypto by typing  C  Python3X pip install -U your wh file

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If you don t already have a C C   development environment installed that is compatible with the Visual Studio binaries distributed by Python org  then you should stick to installing only pure Python packages or packages for which a Windows binary is available   Fortunately  there are PyCrypto binaries available for Windows  http   www voidspace org uk python modules shtml pycrypto  UPDATE  As  Udi suggests in the comment below  the following command also installs pycrypto and can be used in virtualenv as well   easy install http   www voidspace org uk python pycrypto-2 6 1 pycrypto-2 6 1 win32-py2 7 exe   Notice to choose the relevant link for your setup from this list  If you re looking for builds for Python 3 5  see PyCrypto on python 3 5

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Go to  Microsoft Visual C   Compiler for Python 2 7  and continue based on  System Requirements   this is what I did to put below steps together   Install setuptools  setuptools 6 0 or later is required for Python to automatically detect this compiler package  either by  pip install setuptools or download  Setuptools bootstrapping installer  source from  save this file somwhere on your filestystem as  ez python py  and install with  python ez python py Install wheel  wheel is recommended for producing pre-built binary packages   You can install it with  pip install wheel Open Windows elevated Command Prompt cmd exe  with  Run as administrator   to install  Microsoft Visual C   Compiler for Python 2 7  for all users  You can use following command to do so  msiexec  i C  users jozko download VCForPython27 msi ALLUSERS 1 just use your own path to file  msiexec  i  lt path to MSI gt  ALLUSERS 1 Now you should be able to install pycrypto with  pip install pycrypto

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In general  vcvarsall bat is part of the Visual C   compiler  you need that to install what you are trying to install  Don t even try to deal with MingGW if your Python was compiled with Visual Studio toolchain and vice versa  Even the version of the Microsoft tool chain is important  Python compiled with VS 2008 won t work with extensions compiled with VS 2010   You have to compile PyCrypto with the same compiler that the version of Python was compiled with  Google for  Unable to find vcvarsall bat  because that is the root of your problem  it is a very common problem with compiling Python extensions on Windows   There is a lot of information and a lot to read to get this right on whatever system you are on with this link    Beware using Visual Studio 2010 or not using Visual Studio 2008  As far as I know the following is still true  This was posted in the link above in June  2010 referring to trying to build extensions with VS 2010 Express against the Python installers available on python org      Be careful if you do this  Python 2 6 and 2 7 from python org are   built with Visual Studio 2008 compilers  You will need to link with   the same CRT  msvcr90 dll  as Python       Visual Studio 2010 Express links with the wrong CRT version    msvcr100 dll       If you do this  you must also re-build Python with Visual Studio 2010   Express  You cannot use the standard Python binary installer for   Windows  Nor can you use any C C   extensions built with a different   compiler than Visual Studio 2010  Express     Opinion  This is one reason I abandoned Windows for all serious development work for OSX

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I have managed to get pycrypto to compile by using MinGW32 and MSYS  This presumes that you have pip or easy install installed   Here s how I did it   1  Install MinGW32  For the sake of this explanation  let s assume it s installed in C  MinGW  When using the installer  which I recommend  select the C   compiler   MSYS should install with MinGW  2  Add c  mingw bin c  mingw mingw32 bin C  MinGW msys 1 0  c  mingw msys 1 0 bin and c  mingw msys 1 0 sbin to your  PATH   If you aren t familiar  this article is very helpful   3  From the search bar  run msys and the MSYS terminal will open  For those familiar with Cygwin  it works in a similar fashion   4  From within the MSYS terminal pip install pycrypto should run without error after this

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PyCryptodome is an almost-compatible fork of PyCrypto with Windows wheels available on pypi   You can install it with a simple   pip install pycryptodome   The website includes instructions to build it from sources with the Microsoft compilers too

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Microsoft has recently recently released a standalone  dedicated Microsoft Visual C   Compiler for Python 2 7  If you re using Python 2 7  simply install that compiler and Setuptools 6 0 or later  and most packages with C extensions will now compile readily

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It s possible to build PyCrypto using the Windows 7 SDK toolkits  There are two versions of the Windows 7 SDK  The original version  for  Net 3 5  includes the VS 2008 command-line compilers  Both 32- and 64-bit compilers can be installed   The first step is to compile mpir to provide fast arithmetic  I ve documented the process I use in the gmpy library  Detailed instructions for building mpir using the SDK compiler can be found at sdk build  The key steps to use the SDK compilers from a DOS prompt are   1  Run either vcvars32 bat or vcvars64 bat as appropriate   2  At the prompt  execute  set MSSdk 1   3  At the prompt  execute  set DISTUTILS USE SDK 1   This should allow  python setup py install  to succeed assuming there are no other issues  with the C code  But I vaaguely remember that I had to edit a couple of PyCrypto files to enable mpir and to find the mpir libraries but I don t have my Windows system up at the moment  It will be a couple of days before I ll have time to recreate the steps  If you haven t reported success by then  I ll post the PyCrypto steps  The steps will assume you were able to compile mpir   I hope this helps

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This probably isn t the optimal solution but you might download and install the free Visual C   Express package from MS  This will give you the C   compiler you need to compile the PyCrypto code

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So I install MinGW and tack that on the install line as the compiler   of choice  But then I get the error  RuntimeError  chmod error     This error  RuntimeError  chmod error  occurs because the install script didn t find the chmod command      How in the world do I get around this    Solution  You only need to add the MSYS binaries to the PATH and re-run the install script    N B  Note that MinGW comes with MSYS so    Example  For example  if we are in folder C   lt    gt  pycrypto-2 6 1 dist pycrypto-2 6 1 gt   C        gt set PATH C  MinGW msys 1 0 bin  PATH  C        gt python setup py install  Optional  you might need to clean before you re-run the script    C   lt    gt  pycrypto-2 6 1 dist pycrypto-2 6 1 gt  python setup py clean

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So I install MinGW and tack that on the install line as the compiler of choice  But then I get the error  RuntimeError  chmod error     You need to install msys package under MinGW     and add following entries in your PATH env variable    C  MinGW bin C  MinGW msys 1 0 bin  This is where you will find chmod executable    Then run your command from normal windows command prompt

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I had Pycharm for python    Go to pycharm - gt  file - gt  setting - gt  project interpreter Click on   Search for  pycrypto  and install the package   Note  If you don t have  Microsoft Visual C   Compiler for Python 2 7  installed then it will prompt for installation  once installation finished try the above steps it should work fine

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After years and years  python finally agreed for a binary disribution called wheel which allows to install even binary extensions on Windows without having a compiler with simple pip install packagename  There is a list of popular packages with their status  Pycrypto is not there yet  but lxml  PySide and Scrapy for example    Edited Nov 2015  pip uninstall pycrypto  amp  pip install pycryptodome  It is a pycrypto fork with new features and it supports wheel  It replaces pycrypto  so existing code will continue to work  see https   pycryptodome readthedocs org en latest src examples html

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