--- /dev/null
+<?php
+/**
+ * The Random Number Source interface.
+ *
+ * All random number sources must implement this interface
+ *
+ * PHP version 5.3
+ *
+ * @category PHPCryptLib
+ * @package Random
+ * @author Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @copyright 2011 The Authors
+ * @license http://www.opensource.org/licenses/mit-license.html MIT License
+ * @version Build @@version@@
+ */
+
+namespace CryptLib\Random;
+
+/**
+ * The Random Number Source interface.
+ *
+ * All random number sources must implement this interface
+ *
+ * @category PHPCryptLib
+ * @package Random
+ * @author Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @codeCoverageIgnore
+ */
+interface Source {
+
+ /**
+ * Return an instance of Strength indicating the strength of the source
+ *
+ * @return Strength An instance of one of the strength classes
+ */
+ public static function getStrength();
+
+ /**
+ * Generate a random string of the specified size
+ *
+ * Note: If the source fails to generate enough data, the result must be
+ * padded to the requested length.
+ *
+ * @param int $size The size of the requested random string
+ *
+ * @return string A string of the requested size
+ */
+ public function generate($size);
+
+}