On 21/11/2016 19:52, Eichenberger, John wrote:
I am building both OpenSSL and WPA Supplicant for use on a Windows
Mobile 6.5 platform.
The WPA Supplicant version in use is based upon the hostap_2_0 tag
from http://w1.fi/hostap.git.
The version of OpenSSL that we have been using until now is based upon
the OpenSSL_1_0_1g from https://github.com/openssl/openssl
I can upgrade to OpenSSL_1_0_1j and still succeed. But when I merge
changes from OpenSSL_1_0_1k, all 802.1x authentication fails.
I narrowed this problem down to a single line in
crypto/constant_time_locl.h. Attached is the patch set that I applied
to resolve this issue for me.
It is a confusing issue because I can compile that same bit of code in
Visual Studio within a different trivial application and see that
although the two methods for that bit of code produce slightly
different assembly language, both should produce the same result. And
for that trivial application they do! So why this difference breaks
authentication for me when it is all thrown together makes no sense.
In my patch set you can see that I also changed what compiler switches
are used for the WinCE target. That change did not appear to fix or
break anything.
I presume you are building for the ARM architecture since you
didn't specify.
Have you checked if reverting to the old compiler switches makes
1.0.1k work properly (even though it didn't break 1.0.1j)?
The entire thing looks like a compiler bug in handling the
expression used in 1.0.1k?
Enjoy
Jakob
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Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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