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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT LIBRARY COMPONENTS                          --
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--                                                                          --
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--       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        --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--           Copyright (C) 2009, Free Software Foundation, Inc.             --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides supporting code for implementation of the following
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--  secure hash functions described in FIPS PUB 180-3: SHA-224, SHA-256,
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--  SHA-384, SHA-512. It contains the generic transform operation that is
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--  common to the above four functions. The complete text of FIPS PUB 180-3
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--  can be found at:
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--    http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
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--  This is an internal unit and should not be used directly in applications.
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--  Use GNAT.SHA* instead.
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package GNAT.Secure_Hashes.SHA2_Common is
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   Block_Words : constant := 16;
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   --  All functions operate on blocks of 16 words
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   generic
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      with package Hash_State is new Hash_Function_State (<>);
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      Rounds : Natural;
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      --  Number of transformation rounds
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      K : Hash_State.State;
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      --  Constants used in the transform operation
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      with function Sigma0 (X : Hash_State.Word) return Hash_State.Word is <>;
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      with function Sigma1 (X : Hash_State.Word) return Hash_State.Word is <>;
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      with function S0 (X : Hash_State.Word) return Hash_State.Word is <>;
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      with function S1 (X : Hash_State.Word) return Hash_State.Word is <>;
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      --  FIPS PUB 180-3 elementary functions
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   procedure Transform
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     (H_St : in out Hash_State.State;
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      M_St : in out Message_State);
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end GNAT.Secure_Hashes.SHA2_Common;

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