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+------------------------------------------------------------------------------
+-- --
+-- GNAT LIBRARY COMPONENTS --
+-- --
+-- G N A T . S E C U R E _ H A S H E S . S H A 2 _ C O M M O N --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2009, 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 provides supporting code for implementation of the following
+-- secure hash functions described in FIPS PUB 180-3: SHA-224, SHA-256,
+-- SHA-384, SHA-512. It contains the generic transform operation that is
+-- common to the above four functions. The complete text of FIPS PUB 180-3
+-- can be found at:
+-- http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
+
+-- This is an internal unit and should not be used directly in applications.
+-- Use GNAT.SHA* instead.
+
+package GNAT.Secure_Hashes.SHA2_Common is
+
+ Block_Words : constant := 16;
+ -- All functions operate on blocks of 16 words
+
+ generic
+ with package Hash_State is new Hash_Function_State (<>);
+
+ Rounds : Natural;
+ -- Number of transformation rounds
+
+ K : Hash_State.State;
+ -- Constants used in the transform operation
+
+ with function Sigma0 (X : Hash_State.Word) return Hash_State.Word is <>;
+ with function Sigma1 (X : Hash_State.Word) return Hash_State.Word is <>;
+ with function S0 (X : Hash_State.Word) return Hash_State.Word is <>;
+ with function S1 (X : Hash_State.Word) return Hash_State.Word is <>;
+ -- FIPS PUB 180-3 elementary functions
+
+ procedure Transform
+ (H_St : in out Hash_State.State;
+ M_St : in out Message_State);
+
+end GNAT.Secure_Hashes.SHA2_Common;