package Iotta::Input::Checksum;
use strict;
require Iotta::Elem;
our @ISA = ("Iotta::Elem");
our $digest_ok = eval "require Digest::SHA1;";

sub run {
	my $self = shift;
	my $m = shift;
	my $d = shift;
	if ($digest_ok) {
		$$m{checksum} = &Digest::SHA1::sha1_hex($d);
	}
	$self->next->run ($m, $d) if ($self->next);
	return 0;
}

sub initialize {
	my $self = shift;
	$self->SUPER::initialize (@_);
}

1;