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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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