Hello everyone again, I recently posted here with some help from ikegami, but I am still unable to produce the correct checksum (I am trying to match it to the checksum provided by my coworker). I would like to raed each 32 bit chunk of binary, and then turn it to decimal value, and add it to the checksum (which starts at 0). Does my ($n = read FILE, $buffer, 4) work? Is that reading 32 bits? Also, does my restraining work at the end of the script? Thanks for any and all help. 
#!/usr/bin/perl -w
  
  use strict;
  use FileHandle;
  use warnings;

  my $data = "../file.bin";
  my $buffer;
  my $string;
  my $n = 0;
  my $checksum = 0;
  my $num = 0;
  my $str = unpack("B32", pack("N", shift));
  my $bits = 4;
  my $decimal;


open FILE, $data or die $!;
binmode FILE;  

    while (($n = read FILE, $buffer, 4))
 {
    
    $decimal = unpack("N", pack("B32", $buffer));
    
    {$checksum = $checksum + $decimal;
    #$num = $num + $bits;    
    
    #print "1. $num\n";
    print "2. $decimal\n";
    #print "3. $n bytes read\n";
    print "4. $checksum \n";
    }
    
    $checksum %= 2**32;
    
    }

[download]
Whenever i run this script, the number is never correct. Are there any obvious errors here?

In reply to Difficulty producing correct checksum by Anonymous Monk

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