Add _init() and _free() for hash modules
diff --git a/include/polarssl/sha1.h b/include/polarssl/sha1.h
index 57a731b..cb0c436 100644
--- a/include/polarssl/sha1.h
+++ b/include/polarssl/sha1.h
@@ -67,6 +67,20 @@
sha1_context;
/**
+ * \brief Initialize SHA-1 context
+ *
+ * \param ctx SHA-1 context to be initialized
+ */
+void sha1_init( sha1_context *ctx );
+
+/**
+ * \brief Clear SHA-1 context
+ *
+ * \param ctx SHA-1 context to be cleared
+ */
+void sha1_free( sha1_context *ctx );
+
+/**
* \brief SHA-1 context setup
*
* \param ctx context to be initialized