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<H1>[pycrypto] AES decrypting issues</H1>
<B>Mike Driscoll</B>
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TITLE="[pycrypto] AES decrypting issues">mdriscoll at co.marshall.ia.us
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<I>Wed Oct 7 12:54:58 CST 2009</I>
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<PRE>Hi Luke,
><i> Does it decrypt with the PHP example?
</I>><i>
</I>
I asked my colleague and he doesn't use that decrypt method...he just
uses the encrypt one.
><i> You might try encrypting/decrypting an example with Python, then
</I>><i> decrypting the encrypted example with PHP to make sure you have the
</I>><i> right configuration settings.
</I>><i>
</I>><i> It's also possible that the data was corrupted. Is there any kind of
</I>><i> integrity check for the file?
</I>><i>
</I>
I don't think so.
><i> Luke
</I>><i>
</I>
My guess is that either I'm doing something stupid or the encryption is
screwed up.
- Mike
><i> Mike Driscoll wrote:
</I>><i>
</I>>><i> Hi,
</I>>><i>
</I>>><i> I am working on a project where I need to decrypt some data that has
</I>>><i> been encrypted with AES. Our webmaster gave me a PHP example that he
</I>>><i> uses, but I'm supposed to use Python. Here's the PHP code:
</I>>><i>
</I>>><i> $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
</I>>><i> $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
</I>>><i> return rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key,
</I>>><i> $data,MCRYPT_MODE_ECB, $iv),"\0");
</I>>><i>
</I>>><i> I've been told on c.l.py that the iv in this case should be 16 bytes.
</I>>><i>
</I>>><i> I tried following the example on this blog by modifying it as needed:
</I>>><i>
</I>>><i> <A HREF="http://www.codekoala.com/blog/2009/aes-encryption-python-using-pycrypto/">http://www.codekoala.com/blog/2009/aes-encryption-python-using-pycrypto/</A>
</I>>><i>
</I>>><i> But no matter which base64 decode method I use, I get some kind of
</I>>><i> error: b32decode, b64decode and decodestring all return a padding error
</I>>><i> whereas b16decode claims that I don't have only 16-bit characters in my
</I>>><i> data string.
</I>>><i>
</I>>><i> I've never done this before, so I'm not sure where I'm going wrong. Any
</I>>><i> advice would be appreciated. I'm on Windows XP with Python 2.5.
</I>>><i>
</I>>><i> Thanks,
</I>>><i>
</I>>><i> Mike
</I>>><i>
</I>>><i> _______________________________________________
</I>>><i> pycrypto mailing list
</I>>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">pycrypto at lists.dlitz.net</A>
</I>>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto</A>
</I>>><i>
</I>>><i>
</I>>><i>
</I>><i>
</I>><i>
</I>
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