EAP-FAST Internal Crypto Libraries take a lot of time
ramprasad.rajendran at wipro.com
Wed Jan 17 05:56:40 PST 2007
>From: hostap-bounces+ramprasad.rajendran=wipro.com at shmoo.com
>[mailto:hostap-bounces+ramprasad.rajendran=wipro.com at shmoo.com]
> On Behalf Of Jouni Malinen
>Sent: Tuesday, January 16, 2007 9:32 PM
>To: hostap at shmoo.com
>Subject: Re: EAP-FAST Internal Crypto Libraries take a lot of time
>On Tue, Jan 16, 2007 at 09:15:19PM +0530,
>ramprasad.rajendran at wipro.com wrote:
>> I am using the internal TLS and crypto libraries and have
>> CONFIG_INTERNAL_LIBTOMMATH enabled for bringing down the size.
>> I find that during EAP-FAST authentication, after the server
>> out a Server Hello Message, the code keeps looping infinitely in the
>> function s_mp_exptmod in a for(;;) loop. It takes atleast 10 mins
>> before the function returns :-(
>> Is this behaviour because, the run time memory is not enough or the
>> processor is pretty slow.
>10 minutes is bit extreme.. One thing to note is that the
>CONFIG_INTERNAL_LIBTOMMATH version does not include all the
>optimized bignum algorithms from LibTomMath. In other words,
>it is expected to take much more CPU than the optimized
>version (but take less code size). At least in this particular
>case, I would recommend testing with the full LibTomMath (if
>at all possible with the memory/flash restrictions) and if the
>end result is considerable faster, it would be reasonable to
>merge in some of the more optimized code into libtommath.c.
The AP disassociates after about 2 mins. Would it be possible
to increase the inactivity timer or something like similar so
that I can just verify whether it works before I start using
the faster math libraries.
We have a Cisco Aironet 1100 Series.
The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments.
WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email.
More information about the Hostap