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+ <H1>[pycrypto] Docs/code mis-match - not specifying IV fails</H1>

+ Charley Nibley

+ <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Docs/code%20mis-match%20-%20not%20specifying%20IV%20fails&In-Reply-To=%3CCABRBVqR9XorktfarOshnzVPB5CMCzjG2%2BonYvYbtHNt7%3Dp3MuQ%40mail.gmail.com%3E"

+ TITLE="[pycrypto] Docs/code mis-match - not specifying IV fails">cnibley at gmail.com

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+ Tue Jan 7 16:59:10 PST 2014

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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:

+> Hi,

+>

+> I've just been trying to figure out why some code of mine broke after an

+> update from 2.0.1 to 2.6.1, and found that I hadn't been passing an IV into

+> AES.new() (using MODE_CFB).

+>

+> Previously, it was happy with this, and, according to the docs here (

+> <A HREF="https://www.dlitz.net/software/pycrypto/api/current/">https://www.dlitz.net/software/pycrypto/api/current/</A>), "It is optional

+> and when not present it will be given a default value of all zeroes."

+>

+> Looking at the code that throws the exception (

+> <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

+> 163), it doesn't allow for doing what the docs suggest it will.

+>

+> I'm not sure whether I've either misunderstood something or which of the

+> two is wrong, but I thought I'd at least flag it for discussion...

+>

+> Hugh

+>

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