Sorry was reading the perldocs and found that "In scalar context, it [
unpack] returns merely the first value produced."
 
$modulus = unpack('H*', MIME::Base64::decode($modulus) );

this is taking modulus that was base64 encoded and putting it back
into a binary form, this binary is then processed by unpack with the
passed template (H*). I  would think this has some significance, like
i said I never use pack so my actual understanding of how H* is used
to pack/unpack a list is a bit beyond my knowledge. Might try printing
modulus at each point in the conversion process.

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