Move to more PSR-4 standards.

lib/OpenPgP/SignaturePacket/KeyExpirationTimePacket.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Leenooks\OpenPGP\SignaturePacket;
+
+/**
+ * @see http://tools.ietf.org/html/rfc4880#section-5.2.3.6
+ */
+class KeyExpirationTimePacket extends Subpacket
+{
+	protected $tag = 9;
+
+	function body()
+	{
+		return pack('N', $this->data);
+	}
+
+	function read()
+	{
+		$this->data = $this->read_timestamp();
+	}
+}