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diff --git a/lib/Lintian/Index/Md5sums.pm b/lib/Lintian/Index/Md5sums.pm
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+++ b/lib/Lintian/Index/Md5sums.pm
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+# -*- perl -*- Lintian::Index::Md5sums
+#
+# Copyright (C) 2020 Felix Lechner
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package Lintian::Index::Md5sums;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+use Cwd;
+use Unicode::UTF8 qw(encode_utf8 decode_utf8);
+
+use Lintian::IPC::Run3 qw(xargs);
+use Lintian::Util qw(read_md5sums);
+
+use Moo::Role;
+use namespace::clean;
+
+const my $EMPTY => q{};
+const my $NEWLINE => qq{\n};
+
+const my $WAIT_STATUS_SHIFT => 8;
+const my $NULL => qq{\0};
+
+=head1 NAME
+
+Lintian::Index::Md5sums - calculate checksums for index.
+
+=head1 SYNOPSIS
+
+    use Lintian::Index;
+
+=head1 DESCRIPTION
+
+Lintian::Index::Md5sums calculates checksums for an index.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item add_md5sums
+
+=cut
+
+sub add_md5sums {
+    my ($self) = @_;
+
+    my $savedir = getcwd;
+    chdir($self->basedir)
+      or die encode_utf8(
+        $self->identifier . ': Cannot change to directory ' . $self->basedir);
+
+    my $errors = $EMPTY;
+
+    # get the regular files in the index
+    my @files = grep { $_->is_file } @{$self->sorted_list};
+    my @names = map { $_->name } @files;
+
+    my @command = qw(md5sum --);
+
+    my %md5sums;
+
+    xargs(
+        \@command,
+        \@names,
+        sub {
+            my ($stdout, $stderr, $status, @partial) = @_;
+
+            $stderr = decode_utf8($stderr)
+              if length $stderr;
+
+            if ($status) {
+                $errors .= "Cannot run @command: $stderr" . $NEWLINE;
+                return;
+            }
+
+            # undecoded split allows names with non UTF-8 bytes
+            my ($partial_sums, undef) = read_md5sums($stdout);
+
+            $md5sums{$_} = $partial_sums->{$_}for @partial;
+        }
+    );
+
+    $_->md5sum($md5sums{$_->name}) for @files;
+
+    chdir($savedir)
+      or die encode_utf8(
+        $self->identifier . ": Cannot change to directory $savedir");
+
+    return $errors;
+}
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for
+Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et