[Cryptech Tech] modexp regression debug

Joachim Strömbergson joachim at secworks.se
Mon Jun 29 14:35:45 UTC 2015


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Aloha!

I've done some investigations and generated new testcases. I can see
that for 2048 bit modulus the results with the changes on Friday results
in all zero values. I've created a debug branch based on baseline before
perfopt.

I've then added the short exponent functionality (to be able to simulate
testcases with 2048 bit modulus). For 1024 and 1535 operands the
testcases produce correct results. For 2048 the results is incorrect,
but not all zero.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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