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diff --git a/dh_md5sums b/dh_md5sums
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+#!/usr/bin/perl
+
+=head1 NAME
+
+dh_md5sums - generate DEBIAN/md5sums file
+
+=cut
+
+use strict;
+use warnings;
+use Cwd;
+use Debian::Debhelper::Dh_Lib;
+
+our $VERSION = DH_BUILTIN_VERSION;
+
+=head1 SYNOPSIS
+
+B<dh_md5sums> [S<I<debhelper options>>] [B<-x>] [B<-X>I<item>] [B<--include-conffiles>]
+
+=head1 DESCRIPTION
+
+B<dh_md5sums> is a debhelper program that is responsible for generating
+a F<DEBIAN/md5sums> file, which lists the md5sums of each file in the package.
+These files are used by B<dpkg --verify> or the L<debsums(1)> program.
+
+All files in F<DEBIAN/> are omitted from the F<md5sums> file, as are all
+conffiles (unless you use the B<--include-conffiles> switch).
+
+The md5sums file is installed with proper permissions and ownerships.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-x>, B<--include-conffiles>
+
+Include conffiles in the md5sums list. Note that this information is
+redundant since it is included in F</var/lib/dpkg/status> in Debian packages.
+
+=item B<-X>I<item>, B<--exclude=>I<item>
+
+Exclude files that contain I<item> anywhere in their filename from
+being listed in the md5sums file.
+
+=back
+
+=cut
+
+init(options => {
+	"x" => \$dh{INCLUDE_CONFFILES}, # is -x for some unknown historical reason..
+	"include-conffiles" => \$dh{INCLUDE_CONFFILES},
+});
+
+on_pkgs_in_parallel {
+	foreach my $package (@_) {
+		next if is_udeb($package);
+
+		my $dbgsym_tmp = dbgsym_tmpdir($package);
+		my $tmp=tmpdir($package);
+
+		install_dir("$tmp/DEBIAN");
+
+		# Check if we should exclude conffiles.
+		my %conffiles;
+		if (! $dh{INCLUDE_CONFFILES} && -r "$tmp/DEBIAN/conffiles") {
+			# Generate exclude regexp.
+			open(my $fd, '<', "$tmp/DEBIAN/conffiles")
+				or error("open $tmp/DEBIAN/conffiles failed: $!");
+			while (my $line = <$fd>) {
+				chomp($line);
+				next if $line !~ s{^/+}{};
+				next if $line eq '';
+				$conffiles{$line} = 1;
+			}
+			close($fd);
+		}
+
+		generate_md5sums_file($tmp, \%conffiles);
+		if ( -d $dbgsym_tmp) {
+			install_dir("${dbgsym_tmp}/DEBIAN");
+			generate_md5sums_file($dbgsym_tmp);
+		}
+	}
+};
+
+sub generate_md5sums_file {
+	my ($tmpdir, $conffiles) = @_;
+	my $find_pid = open(my $find_fd, '-|') // error("fork failed: $!");
+	my (@files, $pipeline_pid);
+	if (not $find_pid) {
+		# Child
+		chdir($tmpdir) or error("chdir($tmpdir) failed: $!");
+		exec { 'find' } 'find', '-type', 'f', '!', '-regex', './DEBIAN/.*', '-printf', "%P\\0";
+	}
+	local $/ = "\0";  # NUL-terminated input/"lines"
+	while (my $line = <$find_fd>) {
+		chomp($line);
+		next if excludefile($line);
+		next if $conffiles and %{$conffiles} and exists($conffiles->{$line});
+		push(@files, $line);
+	}
+	close($find_fd) or error_exitcode("find -type f ! -regex './DEBIAN/.*' -printf '%P\\0'");
+	@files = sort(@files);
+	verbose_print("cd $tmpdir >/dev/null && " . q{xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums});
+	$pipeline_pid = open(my $pipeline_fd, '|-') // error("fork failed: $!");
+	if (not $pipeline_pid) {
+		# Child
+		chdir($tmpdir) or error("chdir($tmpdir) failed: $!");
+		exec { 'sh' } '/bin/sh', '-c', q{xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums};
+	}
+
+	printf {$pipeline_fd} "%s\0", $_ for @files;  # @files include NUL-terminator
+	close($pipeline_fd) or error_exitcode("cd $tmpdir >/dev/null && xargs -r0 md5sum | perl -pe 'if (s@^\\\\@@) { s/\\\\\\\\/\\\\/g; }' > DEBIAN/md5sums");
+	reset_perm_and_owner(0644, "${tmpdir}/DEBIAN/md5sums");
+	return;
+}
+
+=head1 SEE ALSO
+
+L<debhelper(7)>
+
+This program is a part of debhelper.
+
+=head1 AUTHOR
+
+Joey Hess <joeyh@debian.org>
+
+=cut