RC4 matlab code conversion not working

问题

I have been trying to implement RC4 in Matlab but due to unknown reason the following code is not giving the right output. Please give me suggestion on improving this Matlab code:

function ef = rc4full(pf,ki)
s = rc4key(ki);
disp(s);
s = uint8(s);
j0 = 0;
i0 = 0;
r = prga(s, pf);
disp(r);
v = uint8(pf);
C = bitxor(v,r);
disp(C);
data_show =dec2hex(C);
ef = data_show;

function sc=rc4key(key)
for i0 = 0:255
    sc(i0+1) = i0+1;
end
j0 = 0;
for i0 = 0:255
    j0 = mod(j0 + sc(i0+1) + key(mod(i0, length(key)) + 1), 256);
    tmp = sc(i0+1);
    sc(i0+1) = sc(j0+1);
    sc(j0+1) = tmp;
end

function r = prga(sc, data)
i0=0; j0=0; x=[]; t=[];
for x=0:length(data)-1
    i0 = mod( (i0+1), 256);
    j0 = mod( j0 + sc(i0+1), 256);
    tmp = sc(i0+1);
    sc(i0+1) = sc(j0+1);
    sc(j0+1) = tmp;
    r(x+1) = sc(mod( sc(i0+1) + sc(j0+1), 256)+1);
end

what I am expecting: Suppose I tried 'Hello' as data and 'Hi' as key. then in online it shows this: c9 9f 8d 97 91 but I am getting: af fe 50 1e ff.

来源：https://stackoverflow.com/questions/20777855/rc4-matlab-code-conversion-not-working