Maybe whatever type of object you have, it is not blessed in the right package?

Its easy to find out what you have by using plain print

Also, tye says : don't do in XS what you can do in perl

That might translate to

 
sub OpenCA::OpenSSL::CRL::new {
   my $blah = OpenCA::OpenSSL::CRL::_new_from_der(@_);
   bless $blah, 'OpenCA::OpenSSL::CRL';
}
sub OpenCA::OpenSSL::CRL::DESTROY {
   OpenCA::OpenSSL::CRL::X509_CRL_free(@_);
}
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