hi
in script, there is bug, or maybe he unable to catch point, as
if you have 37 bit pubkey
and you command is
./script 40 02xxxxxxpublickey
40 bit mean search in bit range
but script will find key in 37 bit
if you have 42 bit key, and same command for search in 40 bit by apply 40 or 8:fffff.... bit range, script will find 42 key

its not restrict only for define bit range
mean always find start from 8 to onword, so its take time consume, Smiley
test it