[Ironpython-users] using IronPython with pycrypto

[Markus Schaber]

Hi, Jeff,

Von: Jeff Hardy
> Sorry for the late reply. You've encountered the biggest issue with
> IronPython, which is that it can't load Python extensions that are written in
> C.
> 
> In this case, the _AES modules (_AES.so) is a C library that depends on
> CPython's implementation. Unfortunately, if PyCrypto doesn't provide a pure-
> Python fallback (and it looks like it doesn't, although I may have missed
> it), there's no way to get it to work in IronPython (there is the old
> IronClad project, but it hasn't been updated in years and almost certainly
> would not work with current versions).

I see one possibility: one could try to reimplement the _AES module in C#, possibly based on the .NET Crypto APIs, or as a clean room implementation.

Best regards

Markus Schaber

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> 
> On Wed, Oct 29, 2014 at 10:43 PM, Baron Oldenburg
> <Baron.Oldenburg at leviathansecurity.com> wrote:
> > Hello!
> >
> >
> >
> > I’m attempting to import a module (KillerBee) in IronPython. I’ve
> > encountered a couple of issues along the way, some of which I’ve been
> > able to fix. I’m hoping the mailing list can help me out with what I
> > haven’t fixed. Here are the problems I’ve encountered and the steps I’ve
> taken:
> >
> >
> >
> > 1.       “Exception during object creation: no module named killerbee”
> >
> > a.       Per
> > http://stackoverflow.com/questions/1371994/importing-external-module-i
> > n-ironpython, I added the following which allowed IronPython to
> > recognize killerbee as a module and let me import it:
> >
> > var paths = engine.GetSearchPaths();
> >
> > paths.Add(@"/usr/lib/python2.7/site-packages/");
> >
> > engine.SetSearchPaths(paths);
> >
> > 2.       “Exception during object creation: cannot import _AES from
> > Crypto.Cipher”
> >
> > a.       I tracked this error down to this line in a killerbee file
> > “dot154decode.py”:
> >
> > “from Crypto.Cipher import AES”
> >
> > and then further to /usr/lib/python2.7/site-packages/Crypto/Cipher/AES.py:
> >
> >
> > “from Crypto.Cipher import _AES”
> >
> > In the same directory as AES.py there is an _AES.so.
> >
> > b.      If I attempt this from the python interpreter, there are no errors:
> >
> > $ python
> >
> > Python 2.7.8 (default, Sep 24 2014, 18:26:21)
> >
> > [GCC 4.9.1 20140903 (prerelease)] on linux2
> >
> > Type "help", "copyright", "credits" or "license" for more information.
> >
> >>>> from Crypto.Cipher import AES
> >>>> import Crypto
> >>>> print Crypto.__version__
> >
> > 2.6.1
> >
> >>>>
> >
> > c.       If I attempt this from IronPython with the following code (instead
> > of importing killerbee):
> >
> > engine.ImportModule("Crypto.Cipher.AES");
> >
> > I get the same error (“cannot import _AES from Crypto.Cipher”).
> >
> > d.      If I attempt to just import Crypto.Cipher
> > (“engine.ImportModule("Crypto.Cipher");”) there are no errors.
> >
> > Before I start trying increasingly complicated workarounds, does
> > anyone have an idea as to the possible root cause? I’ve searched
> > around on the Internet generally and in outstanding IronPython issues
> > specifically for other people with this problem, but I’ve only found
> > the following semi-related hits around IronPython and pycrypto:
> >
> >
> >
> > ·
> > http://stackoverflow.com/questions/2365661/how-to-create-a-package-in-
> > c-sharp-for-use-in-ironpython
> >
> > ·         http://www.pyinstaller.org/ticket/881
> >
> > ·
> > http://lists.ironpython.com/pipermail/users-ironpython.com/2006-Novemb
> > er/018956.html
> >
> > ·         https://bitbucket.org/mvdk/ironpycrypto
> >
> >
> >
> > The relevant parts of the source look like this:
> >
> >
> >
> > using IronPython;
> >
> > using IronPython.Hosting;
> >
> > using Microsoft.Scripting;
> >
> > using Microsoft.Scripting.Hosting;
> >
> >
> >
> > ScriptEngine engine = Python.CreateEngine();
> >
> > var paths = engine.GetSearchPaths();
> >
> > paths.Add(@"/usr/lib/python2.7/site-packages/");
> >
> > engine.SetSearchPaths(paths);
> >
> > engine.ImportModule("Crypto.Cipher.AES");
> >
> >
> >
> > Thanks for your time! I’m happy to provide any other details or source
> > code necessary to continue debugging.
> >
> >
> >
> > Baron
> >
> >
> > _______________________________________________
> > Ironpython-users mailing list
> > Ironpython-users at python.org
> > https://mail.python.org/mailman/listinfo/ironpython-users
> >
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