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diff --git a/pipermail/pycrypto/2014q4/000823.html b/pipermail/pycrypto/2014q4/000823.html new file mode 100644 index 0000000..ca049a5 --- /dev/null +++ b/pipermail/pycrypto/2014q4/000823.html @@ -0,0 +1,126 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> + <HEAD> + <TITLE> [pycrypto] Bug in PyCrypto 2.6.1 + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Bug%20in%20PyCrypto%202.6.1&In-Reply-To=%3C547C87D7.1090905%40amberfisharts.com%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <style type="text/css"> + pre { + white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ + } + </style> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="000822.html"> + <LINK REL="Next" HREF="000824.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[pycrypto] Bug in PyCrypto 2.6.1</H1> + <B>Lorenz Quack</B> + <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Bug%20in%20PyCrypto%202.6.1&In-Reply-To=%3C547C87D7.1090905%40amberfisharts.com%3E" + TITLE="[pycrypto] Bug in PyCrypto 2.6.1">don at amberfisharts.com + </A><BR> + <I>Mon Dec 1 07:23:03 PST 2014</I> + <P><UL> + <LI>Previous message: <A HREF="000822.html">[pycrypto] Bug in PyCrypto 2.6.1 +</A></li> + <LI>Next message: <A HREF="000824.html">[pycrypto] Bug in PyCrypto 2.6.1 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#823">[ date ]</a> + <a href="thread.html#823">[ thread ]</a> + <a href="subject.html#823">[ subject ]</a> + <a href="author.html#823">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>Hi Luis, + +Thanks for reporting! +I agree that this seems like strange/wrong behaviour. +Especially when realise that the docs seem to contradict the behaviour. +_RSA.RSAobj.size.__doc__ says: Return the maximum number of bits that can be handled by this key. +But this works fine: + >>> key.encrypt(1<<key.size(), "") +Note that 1 << x has x+1 bits so that the above key happily encrypts key.size()+1 bits. + +The only thing holding me back from strait out calling it a bug is that + 1) this is very old code dating back to 2003. + and 2) the -1 is actively coded there but with out explanation + +As a pointer to others the relevant places are: +/lib/Crypto/PublicKey/_RSA.py:80 +/src/_fastmath.c:949 + +If it is decided that this is a bug and should be fixed one should also look at other keys, e.g. DSA which seems to do +the same -1 calculation. + +Cheers, +Lorenz + + + +On 01/12/14 07:35, Luis González Fernández wrote: +><i> Hello All: +</I>><i> +</I>><i> +</I>><i> I found a strange bug in size() function that return a wrong key size after creating or importing an RSA key. The return +</I>><i> value for the size funciont seems to be keysize-1. +</I>><i> +</I>><i> Here a demo of the bug: +</I>><i> +</I>><i> +</I>><i> <A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">luisgf at NCC1701B</A>:~$ python3 +</I>><i> Python 3.4.0 (default, Apr 11 2014, 13:05:11) +</I>><i> [GCC 4.8.2] on linux +</I>><i> Type "help", "copyright", "credits" or "license" for more information. +</I>><i> >>> from Crypto.PublicKey import RSA +</I>><i> >>> key = RSA.generate(2048) +</I>><i> >>> key.size() +</I>><i> 2047 +</I>><i> >>> +</I>><i> +</I>><i> +</I>><i> Regards. +</I>><i> +</I>><i> -- +</I>><i> +</I>><i> -- +</I>><i> Luis González Fernández +</I>><i> <A HREF="https://www.luisgf.es">https://www.luisgf.es</A> +</I>><i> PGP ID: C918B80F (DD6F BFC1 FC14 4C81 34F8 EA1E 6BCB C27F C918 B80F) +</I>><i> Twitter: @luisgf_2001 / Jabber:<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">luisgf at mijabber.es</A> +</I>><i> +</I>><i> +</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> +</PRE> + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="000822.html">[pycrypto] Bug in PyCrypto 2.6.1 +</A></li> + <LI>Next message: <A HREF="000824.html">[pycrypto] Bug in PyCrypto 2.6.1 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#823">[ date ]</a> + <a href="thread.html#823">[ thread ]</a> + <a href="subject.html#823">[ subject ]</a> + <a href="author.html#823">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">More information about the pycrypto +mailing list</a><br> +</body></html> |