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diff --git a/docs/faq.rst b/docs/faq.rst index 0b7bdce4..4e8efc1d 100644 --- a/docs/faq.rst +++ b/docs/faq.rst @@ -14,5 +14,34 @@ to NaCl. If you prefer NaCl's design, we highly recommend `PyNaCl`_. +When I try to use ``cryptography`` on Windows I get a ``cffi.ffiplatform.VerificationError`` +-------------------------------------------------------------------------------------------- + +This error looks something like: + +.. code-block:: console + + cffi.ffiplatform.VerificationError: importing '<some_path>.pyd': DLL load failed: + +It typically occurs on Windows when you have not installed OpenSSL. Download +a `pre-compiled binary`_ to resolve the issue. To select the right architecture +(32-bit or 64-bit) open a command prompt and start your Python interpreter. + +If it is 32-bit it will say ``32 bit`` as well as ``Intel`` in the output: + +.. code-block:: console + + Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit (Intel)] on win32 + +If it is 64-bit you will see ``64 bit`` as well as ``AMD64``: + +.. code-block:: console + + Python 2.7.6 (default, Nov 10 2013, 19:24:24) [MSC v.1500 64 bit (AMD64)] on win32 + +Note that for both 32-bit and 64-bit it will say ``win32``, but other data +in the string may vary based on your version of Python. + .. _`NaCl`: http://nacl.cr.yp.to/ .. _`PyNaCl`: https://pynacl.readthedocs.org +.. _`pre-compiled binary`: https://www.openssl.org/related/binaries.html |