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<TITLE> [pycrypto] PyCrypto Blowfish CFB limitation
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<H1>[pycrypto] PyCrypto Blowfish CFB limitation</H1>
<B>Webie</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20PyCrypto%20Blowfish%20CFB%20limitation&In-Reply-To=%3CCAN6%2BgWEk-xR9B3FMn%3DO6DCuWHpDLxW%3DWRg8x9JEY1SEaiWdtiA%40mail.gmail.com%3E"
TITLE="[pycrypto] PyCrypto Blowfish CFB limitation">assie181 at gmail.com
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<I>Wed Jun 6 11:50:31 EDT 2012</I>
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<PRE>Hi,
I am getting "ValueError: Input strings must be a multiple of the
segment size 8 in length" when trying to decrypt a file by using
Blowfish in CFB mode. The file length is not a multiple of 8. However,
OpenSSL doesn't require file length to be multiple of 8 and it
successfully decrypts the file.
You can see the problem in action by downloading and running
<A HREF="http://dl.dropbox.com/u/1522424/PyCrypto-limitation.tar">http://dl.dropbox.com/u/1522424/PyCrypto-limitation.tar</A>
(segment_size=64 is required for compatibility with OpenSSL).
1. Is this a limitation imposed by PyCrypto?
2. I could successfully decrypt and inflate the file by padding it
with "x" (randomly chosen). Is this safe and correct?
Thanks!
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