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diff --git a/CryptLib/Key/Derivation/PBKDF/PBKDF2.php b/CryptLib/Key/Derivation/PBKDF/PBKDF2.php
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+<?php
+/**
+ * An implementation of the RFC 2898 PBKDF2 Standard key derivation function
+ *
+ * PHP version 5.3
+ *
+ * @see        http://www.ietf.org/rfc/rfc2898.txt
+ * @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\PBKDF;
+
+use CryptLib\Hash\Hash;
+
+/**
+ * An implementation of the RFC 2898 PBKDF2 Standard key derivation function
+ *
+ * @see        http://www.ietf.org/rfc/rfc2898.txt
+ * @category   PHPCryptLib
+ * @package    Key
+ * @subpackage Derivation
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ */
+class PBKDF2
+    extends \CryptLib\Key\Derivation\AbstractDerivation
+    implements \CryptLib\Key\Derivation\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    $length     The size of the string to generate
+     *
+     * @return string The derived key
+     */
+    public function derive($password, $salt, $iterations, $length) {
+        $size   = Hash::getHashSize($this->hash);
+        $len    = ceil($length / $size);
+        $result = '';
+        for ($i = 1; $i <= $len; $i++) {
+            $tmp = hash_hmac(
+                $this->hash,
+                $salt . pack('N', $i),
+                $password,
+                true
+            );
+            $res = $tmp;
+            for ($j = 1; $j < $iterations; $j++) {
+                $tmp  = hash_hmac($this->hash, $tmp, $password, true);
+                $res ^= $tmp;
+            }
+            $result .= $res;
+        }
+        return substr($result, 0, $length);
+    }
+
+    /**
+     * 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() {
+        return 'pbkdf2-' . $this->hash;
+    }
+
+}
+