Add _init() and _free() for hash modules
diff --git a/include/polarssl/md4.h b/include/polarssl/md4.h
index 6302c3c..fc5a5cd 100644
--- a/include/polarssl/md4.h
+++ b/include/polarssl/md4.h
@@ -67,6 +67,20 @@
md4_context;
/**
+ * \brief Initialize MD4 context
+ *
+ * \param ctx MD4 context to be initialized
+ */
+void md4_init( md4_context *ctx );
+
+/**
+ * \brief Clear MD4 context
+ *
+ * \param ctx MD4 context to be cleared
+ */
+void md4_free( md4_context *ctx );
+
+/**
* \brief MD4 context setup
*
* \param ctx context to be initialized