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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 _ 3 2 --
-- --
-- B o d y --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
package body GNAT.Secure_Hashes.SHA2_32 is
use Interfaces;
------------
-- Sigma0 --
------------
function Sigma0 (X : Word) return Word is
begin
return Rotate_Right (X, 2)
xor Rotate_Right (X, 13)
xor Rotate_Right (X, 22);
end Sigma0;
------------
-- Sigma1 --
------------
function Sigma1 (X : Word) return Word is
begin
return Rotate_Right (X, 6)
xor Rotate_Right (X, 11)
xor Rotate_Right (X, 25);
end Sigma1;
--------
-- S0 --
--------
function S0 (X : Word) return Word is
begin
return Rotate_Right (X, 7)
xor Rotate_Right (X, 18)
xor Shift_Right (X, 3);
end S0;
--------
-- S1 --
--------
function S1 (X : Word) return Word is
begin
return Rotate_Right (X, 17)
xor Rotate_Right (X, 19)
xor Shift_Right (X, 10);
end S1;
end GNAT.Secure_Hashes.SHA2_32;
|
