File : g-shsh64.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT LIBRARY COMPONENTS --
4 -- --
5 -- G N A T . S E C U R E _ H A S H E S . S H A 2 _ 6 4 --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2009, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 package body GNAT.Secure_Hashes.SHA2_64 is
33
34 use Interfaces;
35
36 ------------
37 -- Sigma0 --
38 ------------
39
40 function Sigma0 (X : Word) return Word is
41 begin
42 return Rotate_Right (X, 28)
43 xor Rotate_Right (X, 34)
44 xor Rotate_Right (X, 39);
45 end Sigma0;
46
47 ------------
48 -- Sigma1 --
49 ------------
50
51 function Sigma1 (X : Word) return Word is
52 begin
53 return Rotate_Right (X, 14)
54 xor Rotate_Right (X, 18)
55 xor Rotate_Right (X, 41);
56 end Sigma1;
57
58 --------
59 -- S0 --
60 --------
61
62 function S0 (X : Word) return Word is
63 begin
64 return Rotate_Right (X, 1)
65 xor Rotate_Right (X, 8)
66 xor Shift_Right (X, 7);
67 end S0;
68
69 --------
70 -- S1 --
71 --------
72
73 function S1 (X : Word) return Word is
74 begin
75 return Rotate_Right (X, 19)
76 xor Rotate_Right (X, 61)
77 xor Shift_Right (X, 6);
78 end S1;
79
80 end GNAT.Secure_Hashes.SHA2_64;