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diff --git a/CryptLib/Key/Derivation/PBKDF/SHA256.php b/CryptLib/Key/Derivation/PBKDF/SHA256.php
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+++ b/CryptLib/Key/Derivation/PBKDF/SHA256.php
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+<?php
+/**
+ * An implementation of the crypt library's SHA512 hash method
+ *
+ * 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\PBKDF;
+
+/**
+ * An implementation of the crypt library's SHA512 hash method
+ *
+ * PHP version 5.3
+ *
+ * @category   PHPCryptLib
+ * @package    Key
+ * @subpackage Derivation
+ * @author     Anthony Ferrara <ircmaxell@ircmaxell.com>
+ */
+class SHA256
+    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) {
+        $salt = substr(str_pad($salt, 16, chr(0)), 0, 16);
+        $salt = '$5$rounds='.$iterations.'$'.$salt;
+        return crypt($password, $salt);
+    }
+
+    /**
+     * 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 'sha256';
+    }
+
+}
+