| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- G N A T . S E C U R E _ H A S H E S . S H A 2 _ 6 4 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2009-2021, 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_64 is |
| |
| use Interfaces; |
| |
| ------------ |
| -- Sigma0 -- |
| ------------ |
| |
| function Sigma0 (X : Word) return Word is |
| begin |
| return Rotate_Right (X, 28) |
| xor Rotate_Right (X, 34) |
| xor Rotate_Right (X, 39); |
| end Sigma0; |
| |
| ------------ |
| -- Sigma1 -- |
| ------------ |
| |
| function Sigma1 (X : Word) return Word is |
| begin |
| return Rotate_Right (X, 14) |
| xor Rotate_Right (X, 18) |
| xor Rotate_Right (X, 41); |
| end Sigma1; |
| |
| -------- |
| -- S0 -- |
| -------- |
| |
| function S0 (X : Word) return Word is |
| begin |
| return Rotate_Right (X, 1) |
| xor Rotate_Right (X, 8) |
| xor Shift_Right (X, 7); |
| end S0; |
| |
| -------- |
| -- S1 -- |
| -------- |
| |
| function S1 (X : Word) return Word is |
| begin |
| return Rotate_Right (X, 19) |
| xor Rotate_Right (X, 61) |
| xor Shift_Right (X, 6); |
| end S1; |
| |
| end GNAT.Secure_Hashes.SHA2_64; |
