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+------------------------------------------------------------------------------
+-- --
+-- GNAT LIBRARY COMPONENTS --
+-- --
+-- G N A T . S H A 2 5 6 --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2009-2011, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package implements the SHA-256 secure hash function as described in
+-- FIPS PUB 180-3. The complete text of FIPS PUB 180-3 can be found at:
+-- http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
+
+-- See the declaration of GNAT.Secure_Hashes.H in g-sechas.ads for complete
+-- documentation.
+
+with GNAT.Secure_Hashes.SHA2_Common;
+with GNAT.Secure_Hashes.SHA2_32;
+with System;
+
+package GNAT.SHA256 is new GNAT.Secure_Hashes.H
+ (Block_Words => GNAT.Secure_Hashes.SHA2_Common.Block_Words,
+ State_Words => 8,
+ Hash_Words => 8,
+ Hash_Bit_Order => System.High_Order_First,
+ Hash_State => GNAT.Secure_Hashes.SHA2_32.Hash_State,
+ Initial_State => GNAT.Secure_Hashes.SHA2_32.SHA256_Init_State,
+ Transform => GNAT.Secure_Hashes.SHA2_32.Transform);