The OO interface to Digest::CRC is pretty borken currently. The following should produce correct checksum values, though:

use Digest::CRC;

do {
    my $x = Digest::CRC->new(width=>32, poly=>0x04c11db7, xorout=>~0);
    
    undef $/;
    my $in = <>;
    my $len = length $in;
    my $zz = (pack "J<", $len) =~ s/\0*$//r;

    my $crc = $x->add( $in.$zz )->digest;

    print "$crc $len $ARGV\n";

} while @ARGV;
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