<div dir="ltr">Hi Charley,<div><br></div><div>Thanks for clarifying that - that makes sense to me.</div><div><br></div><div><br></div><div>Cheers</div><div><br></div><div>Hugh<br><div class="gmail_extra"><br clear="all"><div>
<br></div><div class="gmail_quote">On 8 January 2014 00:59, Charley Nibley <span dir="ltr"><<a href="mailto:cnibley@gmail.com" target="_blank">cnibley@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi Hugh,<br><div><br>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.<br>
<br>See line 173: <a href="https://github.com/dlitz/pycrypto/commit/411f60f58cea79f7e93476ba0c069b80a2a4c1a0" target="_blank">https://github.com/dlitz/pycrypto/commit/411f60f58cea79f7e93476ba0c069b80a2a4c1a0</a><br><div>
<br>And see the comments here: <a href="https://bugs.launchpad.net/pycrypto/+bug/997464" target="_blank">https://bugs.launchpad.net/pycrypto/+bug/997464</a><br>
<br></div><div>Charley Nibley<br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Tue, Jan 7, 2014 at 9:43 AM, Hugh Macdonald <span dir="ltr"><<a href="mailto:hugh.macdonald@nvizible.com" target="_blank">hugh.macdonald@nvizible.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hi,<div><br></div><div>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).</div>
<div><br></div><div>Previously, it was happy with this, and, according to the docs here (<a href="https://www.dlitz.net/software/pycrypto/api/current/" target="_blank">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."</div>
<div><br></div><div>Looking at the code that throws the exception (<a href="https://github.com/dlitz/pycrypto/blob/master/src/block_template.c" target="_blank">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.</div>
<div><br></div><div>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...</div><div><br></div><div>
<br></div><div>Hugh</div></div>
<br>
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