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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 1 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2002-2011, 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 SHA-1
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-- secure hash function as described in FIPS PUB 180-3. The complete text
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-- of FIPS PUB 180-3 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.SHA1 instead.
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with GNAT.Byte_Swapping;
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with Interfaces;
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package GNAT.Secure_Hashes.SHA1 is
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package Hash_State is new Hash_Function_State
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(Word => Interfaces.Unsigned_32,
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Swap => GNAT.Byte_Swapping.Swap4,
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Hash_Bit_Order => System.High_Order_First);
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-- SHA-1 operates on 32-bit big endian words
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Block_Words : constant := 16;
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-- Messages are processed in chunks of 16 words
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procedure Transform
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(H : in out Hash_State.State;
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M : in out Message_State);
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-- Transformation function applied for each block
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Initial_State : constant Hash_State.State;
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-- Initialization vector
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private
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Initial_State : constant Hash_State.State :=
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(0 => 16#67452301#,
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1 => 16#EFCDAB89#,
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2 => 16#98BADCFE#,
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3 => 16#10325476#,
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4 => 16#C3D2E1F0#);
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-- Initialization vector from FIPS PUB 180-3
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end GNAT.Secure_Hashes.SHA1;
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