$msg = "this is a test messagez";
$key = "\x4f\xcb"; # or $key = pack "n", 0x4fcb;
$xored = $msg ^ $key;
print join(" ", split(//, $msg)), "\n";
print join(" ", unpack("(H2)*", $msg)), "\n";
print join(" ", unpack("(H2)*", $key)), "\n";
print join(" ", unpack("(H2)*", $xored)), "\n";
__END__
t h i s i s a t e s t m e s s a g e z
74 68 69 73 20 69 73 20 61 20 74 65 73 74 20 6d 65 73 73 61 67 65 7a
4f cb
3b a3 69 73 20 69 73 20 61 20 74 65 73 74 20 6d 65 73 73 61 67 65 7a
The easiest way to generate your key string for the entire message
is probably something like
$key = "\x4f\xcb" x (length($msg)/2);
or
$key = pack("n", 0x4fcb) x (length($msg)/2);
That way you can directly XOR both strings without any further ado:
t h i s i s a t e s t m e s s a g e z
74 68 69 73 20 69 73 20 61 20 74 65 73 74 20 6d 65 73 73 61 67 65 7a
+ $msg
4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb
+ $key
3b a3 26 b8 6f a2 3c eb 2e eb 3b ae 3c bf 6f a6 2a b8 3c aa 28 ae 7a
+ XOR result
___
$xitem = unpack("H*", $array[1]) ^ $key;
What this is doing is XORing the hex-string "7468" (i.e. 4 ASCII
chars, hex 37 34 36 38) with the Perl internal representation of the number 0x4fcb ...
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