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diff --git a/CryptLib/Key/Derivation/KDF.php b/CryptLib/Key/Derivation/KDF.php
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+<?php
+/**
+ * The standard Key Derivation Function interface
+ *
+ * PHP version 5.3
+ *
+ * @category   PHPCryptLib
+ * @package    Key
+ * @subpackage Derivation
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @copyright  2011 The Authors
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT Licenses
+ * @version    Build @@version@@
+ */
+
+namespace CryptLib\Key\Derivation;
+
+/**
+ * The standard Key Derivation Function interface
+ *
+ * @category   PHPCryptLib
+ * @package    Key
+ * @subpackage Derivation
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @codeCoverageIgnore
+ */
+interface KDF {
+
+    /**
+     * Derive a key of the specified length based on the inputted secret
+     *
+     * @param string $secret The secret to base the key on
+     * @param int    $length The length of the key to derive
+     * @param string $other  Additional data to append to the key
+     *
+     * @return string The generated key
+     */
+    public function derive($secret, $length, $other = '');
+
+}