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<H1>[pycrypto] Pycrypto, New contributor, TODO & Camellia</H1>
<B>rusydi hasan</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=%5Bpycrypto%5D%20Pycrypto%2C%20New%20contributor%2C%20TODO%20%26%20Camellia&In-Reply-To=20091115083947.GA7038%40rivest.dlitz.net"
TITLE="[pycrypto] Pycrypto, New contributor, TODO & Camellia">rusydi.hasan at gmail.com
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<I>Sun Nov 15 03:09:20 CST 2009</I>
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<PRE>On Sun, Nov 15, 2009 at 4:39 PM, Dwayne C. Litzenberger <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">dlitz at dlitz.net</A>>wrote:
><i> On Sat, Nov 14, 2009 at 05:39:40PM +0800, rusydi hasan wrote:
</I>><i> >Hi Dwayne,
</I>><i> >
</I>><i> >First of all, let me introduce myself. Im rusydi, an undergaduate computer
</I>><i> >science in malaysia.
</I>><i>
</I>><i> Hi there!
</I>><i>
</I>><i> >I have necessary background in cryptography, specifically block cipher,
</I>><i> and
</I>><i> >C programming. Im interested to become a contributor in the next release
</I>><i> of
</I>><i> >pycrypto (i read that you need the contributor outside US and Canada and
</I>><i> not
</I>><i> >the US/Canada Passport holder), especially in the implementation of some
</I>><i> >block ciphers. But i have few things that i need to ask to you
</I>><i>
</I>><i> That's great! One correction: I only ask that contributors be non-US
</I>><i> citizens/residents. Canada is fine; I'm Canadian. :)
</I>><i>
</I>
Got it :) !
><i>
</I>><i> > 1. In TODO list i saw that pycrypto is gonna implement Camellia. AFAIK,
</I>><i> > camellia is a patented block cipher by Mitsubishi Electric Corporation
</I>><i> and
</I>><i> > Nippon Telegraph and Telephone Corporation (NTT), Japan. I attached the
</I>><i> > intellectual property statement, submitted to NESSIE submission
</I>><i>
</I>><i> Yes, but there is also this:
</I>><i>
</I>><i> Announcement of Royalty-free Licenses for Essential Patents
</I>><i> of NTT Encryption and Digital Signature Algorithms
</I>><i>
</I>><i> <A HREF="http://www.ntt.co.jp/news/news01e/0104/010417.html">http://www.ntt.co.jp/news/news01e/0104/010417.html</A>
</I>><i>
</I>><i> See also the list at:
</I>><i>
</I>><i> <A HREF="http://en.wikipedia.org/wiki/NESSIE">http://en.wikipedia.org/wiki/NESSIE</A>
</I>><i>
</I>
Thanks for the link.
><i>
</I>><i> > 2. Is it necessary to implement some Light-Weight Block Cipher in
</I>><i> > pycrypto ? (such as DESL, TEA, KATAN, SEA, etc) because im planning to
</I>><i> > submit some of these light-weight block cipher for the pycrypto.
</I>><i>
</I>><i> I've never heard of any of these ciphers except for TEA, and TEA is
</I>><i> vulnerable to a practical related-key attack.
</I>><i>
</I>
Its the family of lightweight block cipher, designed for small-scaled system
and ubiquitous devices (RFID, etc) .
You can check this link :
<A HREF="http://www.ecrypt.eu.org/lightweight/index.php/Block_ciphers">http://www.ecrypt.eu.org/lightweight/index.php/Block_ciphers</A>
><i> I am reluctant to add any more 64-bit block ciphers, since you can expect
</I>><i> block collisions after only 2**32 blocks (32 GiB of data) in some modes,
</I>><i> and they're tricky to use in CTR mode with long-term keys (again, because
</I>><i> the collision probability is too high).
</I>><i>
</I>><i> I am also very reluctant to add any variants of DES, since pretty much
</I>><i> every variant of DES has been weaker than DES itself.
</I>><i>
</I>><i> I don't want to maintain additional ciphers in my tree unless they are
</I>><i> mature and offer significant advantages over what PyCrypto already has.
</I>><i> I'm even hesitant to add Camellia---The only reason I'm considering it is
</I>><i> that PyCrypto only has one 128-bit block cipher right now (AES), and
</I>><i> because the proposed candidate, Camellia, made it through the NESSIE
</I>><i> competition. Even then, I don't consider it a priority, and PyCrypto 2.1
</I>><i> will be released without it.
</I>><i>
</I>
Well, i ll still try to work on Camellia.
><i>
</I>><i> I'm much more interested in making the crypto we already have less
</I>><i> error-prone to use. For example, we need a PKCS#1 v2.1 implementation, a
</I>><i> *complete* DSA implementation, improved RSA key generation, improved
</I>><i> primality testing, more test cases, a Diffie-Hellman implementation, a
</I>><i> reworking of the Crypto.PublicKey API, and a thorough de-linting of the C
</I>><i> code.
</I>><i>
</I>><i> That said, some people might find your code to be useful, even if it
</I>><i> doesn't get included in PyCrypto, so feel free to post it to the mailing
</I>><i> list. :-)
</I>><i>
</I>><i> > 3. How to submit the source code ? since i could not clone the git
</I>><i> > repository (the port is blocked from my campus network). And i dont
</I>><i> have
</I>><i> > adequate background in open-source software development.
</I>><i>
</I>><i> <rant>
</I>><i> Your campus network support people need to stop interfering with the
</I>><i> end-to-end operation of the Internet Protocol, and to actually start doing
</I>><i> their job, which is to support you, rather than shifting that burden onto
</I>><i> me.
</I>><i> </rant>
</I>><i>
</I>><i> You should be able to clone from
</I>><i>
</I>><i> <A HREF="http://git.pycrypto.org/crypto/pycrypto-2.x.git">http://git.pycrypto.org/crypto/pycrypto-2.x.git</A>
</I>><i>
</I>><i> As for submitting source code, you should publish your changes somewhere,
</I>><i> such as by doing one of the following things:
</I>><i>
</I>><i> - Post your patches to the mailing list using "git send-email".
</I>><i> - Generate a series of patches using "git format-patch" and send them to
</I>><i> the mailing list yourself.
</I>><i> - Create a git repository somewhere and announce it on the mailing list.
</I>><i>
</I>><i> Thanks!
</I>><i>
</I>><i> - Dwayne
</I>><i>
</I>><i> --
</I>><i> Dwayne C. Litzenberger <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">dlitz at dlitz.net</A>>
</I>><i> Key-signing key - 19E1 1FE8 B3CF F273 ED17 4A24 928C EC13 39C2 5CF7
</I>><i> Annual key (2009) - C805 1746 397B 0202 2758 2821 58E0 894B 81D2 582E
</I>><i> _______________________________________________
</I>><i> pycrypto mailing list
</I>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">pycrypto at lists.dlitz.net</A>
</I>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto</A>
</I>><i>
</I>
Thanks alot !
--
Rusydi Hasan Makarim (0721051)
Department of Computer Science
International Islamic University Malaysia
Gombak, Selangor
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