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<H1>[pycrypto] Docs/code mis-match - not specifying IV fails</H1>
<B>Charley Nibley</B>
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TITLE="[pycrypto] Docs/code mis-match - not specifying IV fails">cnibley at gmail.com
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<I>Tue Jan 7 16:59:10 PST 2014</I>
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<PRE>Hi Hugh,
This behavior you are seeing is expected. It changed with a fix to prevent
an empty string IV passed to the function. IV is always mandatory even if
at some point in a previous build it was being passed as all zeros. I
believe the doc just needs updating.
See line 173:
<A HREF="https://github.com/dlitz/pycrypto/commit/411f60f58cea79f7e93476ba0c069b80a2a4c1a0">https://github.com/dlitz/pycrypto/commit/411f60f58cea79f7e93476ba0c069b80a2a4c1a0</A>
And see the comments here: <A HREF="https://bugs.launchpad.net/pycrypto/+bug/997464">https://bugs.launchpad.net/pycrypto/+bug/997464</A>
Charley Nibley
On Tue, Jan 7, 2014 at 9:43 AM, Hugh Macdonald
<<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">hugh.macdonald at nvizible.com</A>>wrote:
><i> Hi,
</I>><i>
</I>><i> I've just been trying to figure out why some code of mine broke after an
</I>><i> update from 2.0.1 to 2.6.1, and found that I hadn't been passing an IV into
</I>><i> AES.new() (using MODE_CFB).
</I>><i>
</I>><i> Previously, it was happy with this, and, according to the docs here (
</I>><i> <A HREF="https://www.dlitz.net/software/pycrypto/api/current/">https://www.dlitz.net/software/pycrypto/api/current/</A>), "It is optional
</I>><i> and when not present it will be given a default value of all zeroes."
</I>><i>
</I>><i> Looking at the code that throws the exception (
</I>><i> <A HREF="https://github.com/dlitz/pycrypto/blob/master/src/block_template.c,">https://github.com/dlitz/pycrypto/blob/master/src/block_template.c,</A> line
</I>><i> 163), it doesn't allow for doing what the docs suggest it will.
</I>><i>
</I>><i> I'm not sure whether I've either misunderstood something or which of the
</I>><i> two is wrong, but I thought I'd at least flag it for discussion...
</I>><i>
</I>><i>
</I>><i> Hugh
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