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%% Copyright: 2010 Integrated Sytems Laboratory, ETH Zurich
%%            http://www.iis.ee.ethz.ch/~sha3
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function outhex=hex2dec64(val)

tmp0=uint64(hex2dec(val(1:8))*2^32);
tmp1=uint64(hex2dec(val(9:16))); 
outhex=bitor(tmp0,tmp1); 
end