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<H1>[pycrypto] Possible problem in src/_fastmath.c</H1>
<B>Dwayne C. Litzenberger</B>
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TITLE="[pycrypto] Possible problem in src/_fastmath.c">dlitz at dlitz.net
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<I>Thu Oct 16 06:08:32 CST 2008</I>
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<PRE>On Thu, Oct 16, 2008 at 03:39:29AM +0400, Sergey Chernov wrote:
><i>See patch:
</I>><i>----------------------------------------------------------------------------
</I>><i>diff --git a/src/_fastmath.c b/src/_fastmath.c
</I>><i>index d06d697..a0aa181 100755
</I>><i>--- a/src/_fastmath.c
</I>><i>+++ b/src/_fastmath.c
</I>><i>@@ -28,6 +28,7 @@ longObjToMPZ (mpz_t m, PyLongObject * p)
</I>><i> size = p->ob_size;
</I>><i> else
</I>><i> size = -p->ob_size;
</I>><i>+ mpz_clear( m );
</I>><i> for (i = 0; i < size; i++)
</I>><i> {
</I>><i> mpz_set_ui (temp, p->ob_digit[i]);
</I>><i>----------------------------------------------------------------------------
</I>><i>
</I>><i>Current usage do not discover the bug as 'm' is always just-initialized.
</I>><i>Still it, as I think, may cause trouble later.
</I>
Sergey,
What is the purpose of your patch? What bug are you referring to?
Are you trying to set m to zero at the top of the loop? Looking at the GMP
documentation (<A HREF="http://gmplib.org/manual/Initializing-Integers.html">http://gmplib.org/manual/Initializing-Integers.html</A>), I see
that mpz_init() and mpz_clear() have similar usages as malloc() and free(),
so I'm pretty sure that I do not want to apply your patch as-is.
- Dwayne
--
Dwayne C. Litzenberger <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">dlitz at dlitz.net</A>>
Key-signing key - 19E1 1FE8 B3CF F273 ED17 4A24 928C EC13 39C2 5CF7
Annual key (2008) - 4B2A FD82 FC7D 9E38 38D9 179F 1C11 B877 E780 4B45
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