[pycrypto] FYI: PyCrypto on Google App Engine

[Sam Phippen]

2009/5/3 Dwayne C. Litzenberger <dlitz at dlitz.net>

> On Sat, May 02, 2009 at 03:15:42PM +0200, Mads Kiilerich wrote:
> >
> http://code.google.com/appengine/docs/python/tools/libraries.html#PyCrypto
> >
> > App Engine includes a custom version of the Python Cryptography Toolkit
> > <http://www.amk.ca/python/code/crypto>, also known as PyCrypto. The
> version
> > included with App Engine is based on pycrypto 2.0.1. This is not the
> latest
> > version <http://pycrypto.org>, but should be largely compatible with
> more
> > recent versions.
>
> Neat.  Thanks for pointing this out.
>
> > For reasons both technical and legal, the App Engine version of PyCrypto
> > has the following differences from the original PyCrypto 2.0.1:
> >
> >    * The RC5 and IDEA ciphers have been removed.
>
> Makes sense.  RC5 and IDEA are patent-encumbered.
>
> >    * The MODE_PGP encryption mode has been removed.
>
> Hmm.  Does anybody know why MODE_PGP would have been removed?


PGP is a registered company, there may be some trademark/copyright issues
there.


>
>
> >    * All public key cryptography routines are implemented in pure
> >      Python code. They do not use any native acceleration (C code).
>
> In other words, they built PyCrypto without the optional support for libgmp
> (_fastmath.c).
>
>
> --
> Dwayne C. Litzenberger <dlitz at dlitz.net>
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>  Annual key (2008) - 4B2A FD82 FC7D 9E38 38D9  179F 1C11 B877 E780 4B45
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-- 
Sam Phippen

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