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How to do galois multiplication?

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Darsana P M
Darsana P M 2017-12-28
评论： Walter Roberson 2018-1-9
Suppose I have 2 cell array inputs as shown below:
A={'fe' 'ff' 'e9' '92' '86' '65' '73' '1c' '6d' '6a' '8f' '94' '67' '30' '83' '08'};
H={'b8' '3b' '53' '37' '08' 'bf' '53' '5d' '0a' 'a6' 'e5' '29' '80' 'd5' '3b' '78';
How to muliply these inputs using galois field multiplication?? Can somebody helpme?

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Akira Agata
Akira Agata 2017-12-28
If you have the Communications System Toolbox, please try the following script.
% Convert to GF(2^8)
gfA = gf(hex2dec(A),8);
gfH = gf(hex2dec(H),8);
% Multiplication in GF(2^8) field
gfAH = gfA .* gfH;
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Walter Roberson
Walter Roberson 2018-1-9
GFRefArray = gf([0:(2^1)-1]);
contains only 0 and 1 because that is what you asked for. It would need to be
function DECout = gf2dec(HA)
N = 8;
c = 0 : (2^N)-1;
GFRefarray = gf(c, N);
for i = 1:length(HA)
for k = c
if isequal(HA(i),GFRefarray(k+1));
DECout(i)=k;
end
end
end

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