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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 _ 6 4 --
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-- --
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-- B o d y --
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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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package body GNAT.Secure_Hashes.SHA2_64 is
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use Interfaces;
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------------
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-- Sigma0 --
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------------
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function Sigma0 (X : Word) return Word is
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begin
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return Rotate_Right (X, 28)
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xor Rotate_Right (X, 34)
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xor Rotate_Right (X, 39);
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end Sigma0;
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------------
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-- Sigma1 --
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------------
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function Sigma1 (X : Word) return Word is
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begin
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return Rotate_Right (X, 14)
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xor Rotate_Right (X, 18)
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xor Rotate_Right (X, 41);
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end Sigma1;
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--------
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-- S0 --
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--------
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function S0 (X : Word) return Word is
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begin
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return Rotate_Right (X, 1)
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xor Rotate_Right (X, 8)
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xor Shift_Right (X, 7);
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end S0;
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--------
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-- S1 --
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--------
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function S1 (X : Word) return Word is
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begin
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return Rotate_Right (X, 19)
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xor Rotate_Right (X, 61)
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xor Shift_Right (X, 6);
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end S1;
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end GNAT.Secure_Hashes.SHA2_64;
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