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<H1>[pycrypto] Library design philosophy</H1>
<B>Legrandin</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=%5Bpycrypto%5D%20Library%20design%20philosophy&In-Reply-To=49E255BB.2010200%40kiilerich.com"
TITLE="[pycrypto] Library design philosophy">gooksankoo at hoiptorrow.mailexpire.com
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<I>Mon Apr 13 06:54:42 CST 2009</I>
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<PRE>><i> Well ... you can have your opinion if I (a random user) can have mine ;-)
</I>
I was just throwing my stone into the water... :-)
><i> Pycrypto does not claim to be a pure-python crypto library. If you
</I>><i> expect it to be that then it probably won't meet your expectations.
</I>><i>
</I>><i> Pycrypto _is_ cross-platform, and written in a combination of platform
</I>><i> independent C and python, just like Python is.
</I>
My claim goes exactly over the fact that platforms where no suitable
compiler is present or accessible are not supported. Moreover platform
independent C really does not exist (see my previous message).
I don't have real expectations, it is (was) just unclear to me what
the purpose of the library is, and why would one use it. The feeling
I have is that it tries to be used in two camps, without being really
good in any.
><i> (FWIW, pycrypto _is_
</I>><i> partly a "libtomcrypt wrapper", see
</I>><i> <A HREF="http://www.dlitz.net/software/pycrypto/doc/#credits.">http://www.dlitz.net/software/pycrypto/doc/#credits.</A>) Pycrypto _is_
</I>><i> fast. Perhaps not as fast as other optimized libraries are, but it can
</I>><i> be used where performance is important.
</I>
Borrowing SHA256 from libtomcrypt does not make it a wrapper to it, first
because it goes only over SHA256, and second future improvements and bugfixes
in libtomcrypt will probably never end up in this local version.
><i> Some advantages of pycrypto are that it is small, has a simple pythonic
</I>><i> API, and don't have any external dependencies. It is not a incomplete
</I>><i> wrapper of a huge and complex API (such as the openssl API).
</I>
Agreed, even though it is not clear to me whether you refer to any
existing wrapper. M2crypto seems pretty good for instance.
><i> Pure python implementations _could_ be added, but they would probably
</I>><i> not really be usable. Users getting this slow fallback would probably be
</I>><i> annoyed or complain about the performance instead of fixing the problem
</I>><i> by installing the right compiled version.
</I>
I saw several times remarks to urge "normal" users not to use pycryto directly
(e.g. RSA schoolbook encryption), but to rely on savier, higher-level code.
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