diff --git a/lib/karma.pm b/lib/karma.pm
new file mode 100644
index 0000000..afebaf4
--- /dev/null
+++ b/lib/karma.pm
@@ -0,0 +1,92 @@
+package karma;
+
+use 5.018;
+use strict;
+use warnings;
+use utf8;
+use open qw(:std :utf8);
+use English qw( -no_match_vars );
+use Digest::SHA1;
+use DB_File;
+
+use vars qw/$VERSION/;
+use Exporter qw(import);
+our @EXPORT_OK = qw(karmaSet karmaGet);
+
+$VERSION = '1.0';
+
+use File::Basename qw(dirname);
+use File::Path qw(mkpath);
+use conf qw(loadConf);
+use botlib qw(logger);
+
+my $c = loadConf();
+my $karmadir = $c->{karma}->{dir};
+my $max = 5;
+
+# swallow phrase and return answer
+sub karmaSet (@) {
+	my $chatid = shift;
+	my $phrase = shift;
+	my $action = shift;
+	my $score = 0;
+	my $karmafile = sprintf "$karmadir/%s.db", sha1_base64 ($chatid);
+	# init hash, store phrase and score
+	tie my %karma, 'DB_File', $karmafile or do {
+		logger "Something nasty happen when cachedata ties to its data: $OS_ERROR";
+		return sprintf 'Карма %s составляет 0', $phrase;
+	};
+
+	my $sha1_phrase = sha1($phrase);
+
+	if (defined $karma{$sha1_phrase}) {
+		if ($action eq '++') {
+			$score = $karma{$sha1_phrase} + 1;
+			$karma{$sha1_phrase} = $score;
+		} else {
+			$score = $karma{$sha1_phrase} - 1;
+			$karma{$sha1_phrase} = $score;
+		}
+	} else {
+		if ($action eq '++') {
+			$karma{$sha1_phrase} = 1;
+		} else {
+			$karma{$sha1_phrase} = -1;
+		}
+	}
+
+	untie %karma;
+
+	if ($score < 0 && (($score % $max) - 1) == 0)) {
+		return sprintf 'Зарегистрировано пробитие дна, карма %s составляет %d', $phrase, $score;
+	} else {
+		return sprintf 'Карма %s составляет %d', $phrase, $score;
+	}
+}
+
+# just return answer
+sub karmaGet (@) {
+	my $chatid = shift;
+	my $phrase = shift;
+
+	my $karmafile = sprintf "$karmadir/%s.db", sha1_base64 ($chatid);
+	# init hash, store phrase and score
+	tie my %karma, 'DB_File', $karmafile or do {
+		logger "Something nasty happen when karma ties to its data: $OS_ERROR";
+		return sprintf 'Карма %s составляет 0', $phrase;
+	};
+
+	my $sha1_phrase = sha1 ($phrase);
+	my $score = $karma{$sha1_phrase};
+	untie %karma;
+
+	unless (defined $score) {
+		$score = 0;
+	}
+
+	return sprintf 'Карма %s составляет %d', $phrase, $score;
+}
+
+1;
+
+# vim: ft=perl noet ai ts=4 sw=4 sts=4: