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

+ Dave Pawson

+ <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=%3CCAEncD4eAVgEGXPdxCxzHiLS0khkK%2B8oNMfnLpn%2BcegNyM6AjWA%40mail.gmail.com%3E"

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

+ </A>

+ Wed Jan 8 02:00:55 PST 2014

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+<PRE>What does not make sense is that this group seems to accept this

+discrepency between

+docs and code.

+Does anyone know if the docs maintainer has any interest these days?

+regards

+On 8 January 2014 09:32, Hugh Macdonald <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">hugh.macdonald at nvizible.com</A>> wrote:

+> Hi Charley,

+>

+> Thanks for clarifying that - that makes sense to me.

+>

+> Cheers

+>

+> Hugh

+>

+> On 8 January 2014 00:59, Charley Nibley <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">cnibley at gmail.com</A>> wrote:

+>>

+>> 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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+>>>

+>>

+>> _______________________________________________

+>> pycrypto mailing list

+>> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">pycrypto at lists.dlitz.net</A>

+>> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto</A>

+>>

+>

+> D I S C L A I M E R : This email and any files transmitted with it are

+> intended solely for the intended addressee, and may contain confidential

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+> If you have received this message in error, please return it to the sender

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+> disclose its contents to any other person. Only the intended recipient may

+> place any reliance upon it. Nvizible Limited accepts no responsibility or

+> liability for emails sent by its employees or personnel which are not sent

+> in the course of its business or that of its clients.

+>

+> Nvizible Limited, 8/9 Carlisle Street, London W1D 3BP . Registered in

+> England & Wales with Company Number: 6900121

+>

+> _______________________________________________

+> pycrypto mailing list

+> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">pycrypto at lists.dlitz.net</A>

+> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto</A>

+>

+

+--

+Dave Pawson

+XSLT XSL-FO FAQ.

+Docbook FAQ.

+<A HREF="http://www.dpawson.co.uk">http://www.dpawson.co.uk</A>

+</PRE>

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