an extra byte or two in the key doesn't hurt anything
It's maybe worth trimming your XORed string to the
original length, or else half of your key pattern might leak... (to
anyone who makes an educated guess about the procedure)
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 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f c
+b
3b a3 26 b8 6f a2 3c eb 2e eb 3b ae 3c bf 6f a6 2a b8 3c aa 28 ae 35 c
+b
^
+^
... just in case you do want to keep it secret (I don't really know
what you intent to use this for).
(OTOH, if encryption was the idea, and security was of any relevance, I'd choose a different approach anyway :)
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