Python Cryptography Toolkit (pycrypto) ====================================== This is a collection of both secure hash functions (such as MD5 and SHA), and various encryption algorithms (AES, DES, RSA, ElGamal, etc.). The package is structured to make adding new modules easy. I consider this section to be essentially complete, and the software interface will almost certainly not change in an incompatible way in the future; all that remains to be done is to fix any bugs that show up. If you encounter a bug, please report it in the SourceForge bug tracker at https://sourceforge.net/tracker/?group_id=20937&atid=120937 An example usage of the MD5 module is: >>> from Crypto.Hash import MD5 >>> hash=MD5.new() >>> hash.update('message') >>> hash.digest() 'x\xe71\x02}\x8f\xd5\x0e\xd6B4\x0b|\x9ac\xb3' An example usage of an encryption algorithm (AES, in this case) is: >>> from Crypto.Cipher import AES >>> obj=AES.new('This is a key456', AES.MODE_ECB) >>> message="The answer is no" >>> ciphertext=obj.encrypt(message) >>> ciphertext 'o\x1aq_{P+\xd0\x07\xce\x89\xd1=M\x989' >>> obj2 = AES.new('This is a key456', AES.MODE_ECB) >>> obj2.decrypt(ciphertext) 'The answer is no' One possible application of the modules is writing secure administration tools. Another application is in writing daemons and servers. Clients and servers can encrypt the data being exchanged and mutually authenticate themselves; daemons can encrypt private data for added security. Python also provides a pleasant framework for prototyping and experimentation with cryptographic algorithms; thanks to its arbitrary-length integers, public key algorithms are easily implemented. Development of the toolkit can be discussed on the pct mailing list; archives and instructions for subscribing at at . Installation ============ The toolkit is written and tested using Python 2.2, though it should also work with Python 2.1. Python 1.5.2 is not supported, and the setup.py script will abort if you run it with 1.5.2. The modules are packaged using the Distutils, so you can simply run "python setup.py build" to build the package, and "python setup.py install" to install it. If the setup.py script crashes with a DistutilsPlatformError complaining that the file /usr/lib/python2.2/config/Makefile doesn't exist, this means that the files needed for compiling new Python modules aren't installed on your system. Red Hat users often run into this because they don't have the python2-devel RPM installed. The fix is to simply install the requisite RPM. To verify that everything is in order, run "python test.py". It will test all the cryptographic modules, skipping ones that aren't available. If the test script reports an error on your machine, please report the bug using the bug tracker (URL given above). If possible, track down the bug and include a patch that fixes it. To install the package under the site-packages directory of your Python installation, run "python setup.py install". If you have any comments, corrections, or improvements for this package, please send it to the 'pct' mailing list. Good luck! --amk (www.amk.ca)