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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;
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