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

for j=0:statewidth-1
    for i=5:8
        state(8*j+i) = bitor(bitshift(state(8*j+i), j), bitshift(state(8*j+i), j-32));
    end
end
end