What is the error in this?

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Darsana P M
Darsana P M 2018-1-3
评论： Darsana P M 2018-1-10
function DECout = gf2dec(HA)
c=0:[(2^8)-1];
GFRefarray=gf(c);
for i=1:length(HA)
for k=0:(2^8)-1
temp=isequal(HAHA(i),GFRefarray(i));
if (temp==1)
DECout(i)=k;
end
end
end
The error is: >> gf2dec Error using gf (line 65) X must be between 0 and 2^m-1
Error in gf2dec (line 3) GFRefarray=gf(c); How to solve this??
The value of HA is:
HA = GF(2^8) array. Primitive polynomial = D^8+D^4+D^3+D^2+1 (285 decimal)
Array elements =
172
106
200
187
68
251
103
2
149
131
25
55
237
110
129
231
I am trying to convert the galois polynomial, HA into a numeric value. I want to encrypt the data. So, how can I convert this ?

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回答（1 个）

Walter Roberson
Walter Roberson 2018-1-3
>> help gf
gf Create a Galois field array.
X_GF = gf(X,M) creates a Galois field array from X in the field
gf(2^M), for 1<=M<=16. The elements of X must be integers between 0
and 2^M-1. [...]
X_GF = gf(X) uses a default value of M = 1.
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Darsana P M
Darsana P M 2018-1-10
Yes, that is right sir. But HA is obtained from hash1(g) which is again a function. How to call a functon within a function??
Darsana P M
Darsana P M 2018-1-10
Very sorry Sir, now I got the error rectified. I made a mistake while calling functions. Thanks a lot sir.

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