Add _init() and _free() for cipher modules
diff --git a/include/polarssl/xtea.h b/include/polarssl/xtea.h
index 07118d9..794c5ef 100644
--- a/include/polarssl/xtea.h
+++ b/include/polarssl/xtea.h
@@ -65,6 +65,20 @@
xtea_context;
/**
+ * \brief Initialize XTEA context
+ *
+ * \param ctx XTEA context to be initialized
+ */
+void xtea_init( xtea_context *ctx );
+
+/**
+ * \brief Clear XTEA context
+ *
+ * \param ctx XTEA context to be cleared
+ */
+void xtea_free( xtea_context *ctx );
+
+/**
* \brief XTEA key schedule
*
* \param ctx XTEA context to be initialized