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Originally Posted by Arrie
we must use a prefix zero if the secret datapacket is smaller then 16(dec) or F(hex), is this correct ?
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Actually smaller than 16(dec) = 10(hex). As the conversion from hex back to bytes assumes each byte is represented by a 2 character hex number then the original byte to hex must make sure that each bytes maps to a 2 character hex number. The library only produces a single hex character for values less than 16 so the "0" needs to be added to make it 2 characters.
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And if so is this than a bug or just stupid programming from me 
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Neither, just a "feature" of the library you didn't know about.