{"id":236,"hash":"d951f56e4a7bb33e99dae3e64786b12e15efb77a560674e2f203ea5e28abdcc9","pattern":"Failed to install Python Cryptography package with PIP and setup.py","full_message":"When I try to install the Cryptography package for Python through either pip install cryptography or by downloading the package from their site and running python setup.py, I get the following error:\n\nD:\\Anaconda\\Scripts\\pip-script.py run on 02/27/14 16:13:17\nDownloading/unpacking cryptography\n  Getting page https://pypi.python.org/simple/cryptography/\n  URLs to search for versions for cryptography:\n  * https://pypi.python.org/simple/cryptography/\n  Analyzing links from page https://pypi.python.org/simple/cryptography/\n    Skipping https://pypi.python.org/packages/cp26/c/cryptography/cryptography-0.2-cp26-none-win32.whl#md5=13e5c4b19520e7dc6f07c6502b3f74e2 (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp26/c/cryptography/cryptography-0.2.1-cp26-none-win32.whl#md5=00e733648ee5cdb9e58876238b1328f8 (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp27/c/cryptography/cryptography-0.2-cp27-none-win32.whl#md5=013ccafa6a5a3ea92c73f2c1c4879406 (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp27/c/cryptography/cryptography-0.2.1-cp27-none-win32.whl#md5=127d6a5dc687250721f892d55720a06c (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp32/c/cryptography/cryptography-0.2-cp32-none-win32.whl#md5=051424a36e91039807b72f112333ded3 (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp32/c/cryptography/cryptography-0.2.1-cp32-none-win32.whl#md5=53f6f57db8e952d64283baaa14cbde3d (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp33/c/cryptography/cryptography-0.2-cp33-none-win32.whl#md5=302812c1c1a035cf9ba3292f8dbf3f9e (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Skipping https://pypi.python.org/packages/cp33/c/cryptography/cryptography-0.2.1-cp33-none-win32.whl#md5=81acca90caf8a45f2ca73f3f9859fae4 (from https://pypi.python.org/simple/cryptography/) because it is not compatible with this Python\n    Found link https://pypi.python.org/packages/source/c/cryptography/cryptography-0.1.tar.gz#md5=bdc1c5fe069deca7467b71a0cc538f17 (from https://pypi.python.org/simple/cryptography/), version: 0.1\n    Found link https://pypi.python.org/packages/source/c/cryptography/cryptography-0.2.1.tar.gz#md5=872fc04268dadc66a0305ae5ab1c123b (from https://pypi.python.org/simple/cryptography/), version: 0.2.1\n    Found link https://pypi.python.org/packages/source/c/cryptography/cryptography-0.2.tar.gz#md5=8a3d21e837a21e1b7634ee1f22b06bb6 (from https://pypi.python.org/simple/cryptography/), version: 0.2\n  Using version 0.2.1 (newest of versions: 0.2.1, 0.2, 0.1)\n  Downloading from URL https://pypi.python.org/packages/source/c/cryptography/cryptography-0.2.1.tar.gz#md5=872fc04268dadc66a0305ae5ab1c123b (from https://pypi.python.org/simple/cryptography/)\n  Running setup.py (path:c:\\users\\paco\\appdata\\local\\temp\\pip_build_Paco\\cryptography\\setup.py) egg_info for package cryptography\n    In file included from c/_cffi_backend.c:7:0:\n    c/misc_win32.h:225:23: error: two or more data types in declaration specifiers\n    c/misc_win32.h:225:1: warning: useless type name in empty declaration [enabled by default]\n    c/_cffi_backend.c: In function 'convert_array_from_object':\n    c/_cffi_backend.c:1105:26: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1105:26: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c:1130:30: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1130:30: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c:1150:30: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1150:30: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c: In function 'convert_struct_from_object':\n    c/_cffi_backend.c:1183:26: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1183:26: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c:1196:30: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1196:30: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c: In function 'cdata_repr':\n    c/_cffi_backend.c:1583:13: warning: unknown conversion type character 'L' in format [-Wformat]\n    c/_cffi_backend.c:1583:13: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c:1595:9: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1595:9: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c: In function 'cdataowning_repr':\n    c/_cffi_backend.c:1647:30: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1647:30: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c: In function '_cdata_get_indexed_ptr':\n    c/_cffi_backend.c:1820:26: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1820:26: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1820:26: warning: too many arguments for format [-Wformat-extra-args]\n    c/_cffi_backend.c: In function '_cdata_getslicearg':\n    c/_cffi_backend.c:1872:26: warning: unknown conversion type character 'z' in format [-Wformat]\n    c/_cffi_backend.c:1872:26: warning: unknown conversion type character 'z' in format [-Wf","ecosystem":"pypi","package_name":"cryptography","package_version":null,"solution":"I had a similar issue, and found I was simply missing a dependency (libssl-dev, for me). As referenced in https://cryptography.io/en/latest/installation/, ensure that all dependencies are met:\n\nOn Windows\nIf you’re on Windows you’ll need to make sure you have OpenSSL installed. There are pre-compiled binaries available. If your installation is in an unusual location set the LIB and INCLUDE environment variables to include the\ncorresponding locations. For example:\n\nC:\\> \\path\\to\\vcvarsall.bat x86_amd64\nC:\\> set LIB=C:\\OpenSSL-1.0.1f-64bit\\lib;%LIB%\nC:\\> set INCLUDE=C:\\OpenSSL-1.0.1f-64bit\\include;%INCLUDE%\nC:\\> pip install cryptography\n\nBuilding cryptography on Linux\ncryptography should build very easily on Linux provided you have a C compiler, headers for Python (if you’re\nnot using pypy), and headers for the OpenSSL and libffi libraries available on your system.\n\nFor Debian and Ubuntu, the following command will ensure that the required dependencies are installed:\n\nsudo apt-get install build-essential libssl-dev libffi-dev python-dev\n\nFor Fedora and RHEL-derivatives, the following command will ensure that the required dependencies are installed:\n\nsudo yum install gcc libffi-devel python-devel openssl-devel\n\nYou should now be able to build and install cryptography with the usual.\n\npip install cryptography","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/22073516/failed-to-install-python-cryptography-package-with-pip-and-setup-py","votes":317,"created_at":"2026-04-19T04:41:35.779419+00:00","updated_at":"2026-04-19T04:51:47.828407+00:00"}