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+ <H1>[pycrypto] Bug in PyCrypto 2.6.1</H1>

+ Luis González Fernández

+ <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Bug%20in%20PyCrypto%202.6.1&In-Reply-To=%3C548AE673.4020802%40luisgf.es%3E"

+ TITLE="[pycrypto] Bug in PyCrypto 2.6.1">luisgf at luisgf.es

+ </A>

+ Fri Dec 12 04:58:27 PST 2014

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+<PRE>Hi All:

+Any news about this?

+On 01/12/14 18:48, Lorenz Quack wrote:

+> On 01/12/14 17:23, Mirko Dziadzka wrote:

+>> Oh, I totally agree. Either the name or the implementation has a

+>> problem.

+>

+> +1

+>

+>>

+>> I was just pointing out that the behavior is consistent with the

+>> documentation in

+>> <A HREF="https://www.dlitz.net/software/pycrypto/api/current/Crypto.PublicKey.RSA._RSAobj-class.html#size">https://www.dlitz.net/software/pycrypto/api/current/Crypto.PublicKey.RSA._RSAobj-class.html#size</A>

+>

+> I disagree. As I showed in the code example and you pointed out in

+> your previous post there are *some* values that the key can handle

+> with more bits than reported by size().

+> So, size() is *not* the "maximum number of bits that can be handled by

+> this key".

+> It is the maximum number of bits that is guaranteed to work for all

+> values.

+>

+> Lorenz

+>

+>>

+>> Mirko

+>>

+>> On 01.12.2014, at 17:31, Paul Koning <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">paul_koning at dell.com</A>> wrote:

+>>

+>>> To me, key_size means the size of the key. It doesn’t mean the

+>>> largest value you can encrypt. If that is what is intended, or if

+>>> it has to stay that way for historical reasons, fine, but it needs

+>>> to be very clearly pointed out in the documentation because it is

+>>> unexpected and counterintuitive.

+>>>

+>>> paul

+>>>

+>>>> On Dec 1, 2014, at 11:13 AM, Mirko Dziadzka

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

+>>>>

+>>>> HI

+>>>>

+>>>> Some thoughts about this …

+>>>>

+>>>>> _RSA.RSAobj.size.__doc__ says: Return the maximum number of bits

+>>>>> that can be handled by this key

+>>>>

+>>>> An RSA key can only encrypt data smaller than this key. So if we

+>>>> have an 2048 bit RSA key, it can encrypt some 2048 bit values, but

+>>>> not all. So 2047 should be the safe value here.

+>>>>

+>>>> IMHO this -1 is correct here.

+>>>>

+>>>> Mirko

+>>>

+>>> _______________________________________________

+>>> 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>

+>>

+>> _______________________________________________

+>> 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>

+>>

+>

+> _______________________________________________

+> 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>

+

+--

+Luis González Fernández

+<A HREF="https://www.luisgf.es">https://www.luisgf.es</A>

+PGP ID: C918B80F (DD6F BFC1 FC14 4C81 34F8 EA1E 6BCB C27F C918 B80F)

+Twitter: @luisgf_2001 / Jabber: <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">luisgf at mijabber.es</A>

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