I believe the above posted code is incorrect. An example string that breaks this is:

0001111000001111000001111000001111000001111000001111000001111000001111
+000000000000000000000000000000000000000000000000000000000000000000000
+000000000000000000000000001111000001111000001111000001111000001111000
+00111100000111100000111100000111100000111100
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One correct way of doing bin2hex is:

sub bin2hex {
    my $line = $_[0];
    my $lenCount = 4;
    my $hexLine = "";
    my $width = '4';

    while ( length($line) % $width != 0) {
        $line = '0' . $line;
    }

    while ($lenCount <= length($line)) {
        my $x = substr ($line, -($lenCount), $width);
        $hexLine = sprintf("%X", oct("0b$x")).$hexLine;
        $lenCount += 4;
    }

    print "In bin2hex: $line\nAfter bin2hex: $hexLine\n\n";
    return $hexLine;
}
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2020-03-04 Athanasius added code tags.