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diff --git a/CryptLib/Key/Derivation/PBKDF.php b/CryptLib/Key/Derivation/PBKDF.php
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+<?php
+/**
+ * The core PBKDF interface (Password Based Key Derivation Function)
+ *
+ * This interface must be used to describe all derivation functions that take a
+ * password as input and produce a key or hash as output 
+ *
+ * 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 License
+ * @version    Build @@version@@
+ */
+
+namespace CryptLib\Key\Derivation;
+
+/**
+ * The core PBKDF interface (Password Based Key Derivation Function)
+ *
+ * This interface must be used to describe all derivation functions that take a
+ * password as input and produce a key or hash as output
+ *
+ * @category   PHPCryptLib
+ * @package    Key
+ * @subpackage Derivation
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ * @codeCoverageIgnore
+ */
+interface PBKDF {
+
+    /**
+     * Derive a key from the supplied arguments
+     *
+     * @param string $password   The password to derive from
+     * @param string $salt       The salt string to use
+     * @param int    $iterations The number of iterations to use
+     * @param int    $length     The size of the string to generate
+     *
+     * @return string The derived key
+     */
+    public function derive($passkey, $salt, $iterations, $klen);
+
+    /**
+     * Get the signature for this implementation
+     *
+     * This should include all information needed to build the same isntance
+     * later.
+     *
+     * @return string The signature for this instance
+     */
+    public function getSignature();
+
+}