If you want speed this up, you might wanna try unpack's template for counting bits.

perlpacktut#Doing-Sums

And an even parity bit can be determined like this:

my $evenparity = unpack( '%1b*', $mask );

And you could use & to isolate the right bits with pre-calculated bit-masks.

PS: not sure why you use B64 for 32bit hex.

update

that's a weak demo because I don't seem to get MSB and LSB right.

  DB<85> $n=pack 'h8', '3E10F67A'

  DB<86> undef $m0; vec($m0,$_,1)=1 for  0, 1, 3, 4, 6, 8, 10, 11, 13,
+ 15, 17, 19, 21, 23, 25, 26, 28, 30

  DB<87> say unpack 'b32',$_ for $n, $m0, $n & $m0
11000111100000001111011011100101
11011010101101010101010101101010
11000010100000000101010001100000

  DB<88> p unpack '%1b', $n & $m0
1

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^4: ECC computation by LanX
in thread ECC computation by savangadi

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