diff --git a/codecept.phar b/codecept.phar
new file mode 100644
index 0000000000..d4212c8b33
Binary files /dev/null and b/codecept.phar differ
diff --git a/lib/util/dkim.php b/lib/util/dkim.php
new file mode 100644
index 0000000000..5e673dcef2
--- /dev/null
+++ b/lib/util/dkim.php
@@ -0,0 +1,23 @@
+<?php
+namespace MailPoet\Util;
+class DKIM {
+
+  public static function generate_keys() {
+    try {
+      $certificate = openssl_pkey_new(array('private_bits'  =>  1024));
+
+      $keys = array('public' => '', 'private' => '');
+
+      // get private key
+      openssl_pkey_export($certificate, $keys['private']);
+
+      // get public key
+      $details = openssl_pkey_get_details($certificate);
+      $keys['public'] = $details['key'];
+
+      return $keys;
+    } catch(Exception $e) {
+       return false;
+    }
+  }
+}
\ No newline at end of file
diff --git a/tests/unit/DKIMCest.php b/tests/unit/DKIMCest.php
new file mode 100644
index 0000000000..097609d8ed
--- /dev/null
+++ b/tests/unit/DKIMCest.php
@@ -0,0 +1,44 @@
+<?php
+use \UnitTester;
+
+class DKIMCest
+{
+
+    public function _before(UnitTester $I)
+    {
+
+    }
+
+    public function _after(UnitTester $I)
+    {
+
+    }
+
+    public function it_can_generate_keys(UnitTester $I) {
+        $I->wantTo('generate public and private keys');
+
+        $keys = \MailPoet\Util\DKIM::generate_keys();
+
+        $I->expect('public key is not empty');
+        $I->assertNotEmpty($keys['public']);
+
+        $I->expect('private key is not empty');
+        $I->assertNotEmpty($keys['private']);
+
+        $I->expect('public key starts with proper header');
+        $I->assertTrue(
+            strpos(
+                $keys['public'],
+                '-----BEGIN PUBLIC KEY-----'
+            ) === 0
+        );
+
+        $I->expect('private key starts with proper header');
+        $I->assertTrue(
+            strpos(
+                $keys['private'],
+                '-----BEGIN RSA PRIVATE KEY-----'
+            ) === 0
+        );
+    }
+}