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copied!<p>Here is a step-by-step I've just made up on my CentOS server (the sequence assumes you're not root):</p> <p><strong>LIBGMP INSTALL</strong></p> <p>Firstly, setup and install libgmp somewhere in your home directory, as follows:</p> <pre><code>./configure prefix=$HOME make make install prefix=$HOME </code></pre> <p>This will create a ~/lib, a ~/include and a ~/share directory if not existing already.</p> <p>Then, add the following line to your .bashrc:</p> <pre><code>export LD_LIBRARY_PATH=$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH </code></pre> <p>Do a ". ~/.bashrc" to enforce your changes.</p> <p><strong>PYCRYPTO BUILD & INSTALL</strong></p> <p>We need to deal with the install process manually. Firstly, we may download pycrypto as follows:</p> <ul> <li><p>go into a directory where you store your sources:</p> <p>cd ~/src</p></li> <li><p>download pycrypto source archive:</p> <p>curl -o pycrypto.tar.gz "<a href="https://pypi.python.org/packages/source/p/pycrypto/pycrypto-2.6.tar.gz#md5=88dad0a270d1fe83a39e0467a66a22bb" rel="nofollow">https://pypi.python.org/packages/source/p/pycrypto/pycrypto-2.6.tar.gz#md5=88dad0a270d1fe83a39e0467a66a22bb</a>"</p></li> <li><p>uncompress + untar archive:</p> <p>gunzip pycrypto.tar.gz tar xvf pycrypto.tar</p></li> </ul> <p>Then we need to cheat the configuration "a bit":</p> <pre><code>cd pycrypto-26 ./configure --includedir=$HOME/include </code></pre> <ul> <li><p>Edit the file cd src/config.h and amend the values for the definitions:</p> <p>#define HAVE_DECL_MPZ_POWM 0 instead of 1</p> <p>#define HAVE_DECL_MPZ_POWM_SEC 1 instead of 0</p> <p>#define HAVE_LIBGMP 1 instead of 0</p></li> <li><p>Then edit the setup.py file by searching for the keyword "_fastmath" and ensure that the Extension() declaration looks as per below:</p> <pre><code>Extension("Crypto.PublicKey._fastmath", include_dirs=['/home/<yourhome>/include','src/','/usr/include/'], library_dirs=['/home/<yourhome>/lib'], libraries=['gmp'], sources=["src/_fastmath.c"]), </code></pre></li> </ul> <p>Finally, build pycrypto with:</p> <pre><code>python setup.py build </code></pre> <p>You should see somewhere in the trace the following line:</p> <pre><code>... building 'Crypto.PublicKey._fastmath' extension ... </code></pre> <p>You can then do a "python setup.py install" or, if like me you prefer pip:</p> <pre><code>cd .. pip install ./pycrypto-2.6 </code></pre> <p>Then you should get no error when executing the following lines from python:</p> <pre><code>>>> from Crypto.PublicKey import _fastmath >>> import Crypto.Random >>> _fastmath.HAVE_DECL_MPZ_POWM_SEC 1 </code></pre>

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