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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . S E C U R E _ H A S H E S . S H A 2 _ 3 2 --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 2009-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 package body GNAT.Secure_Hashes.SHA2_32 is
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33
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34 use Interfaces;
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35
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36 ------------
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37 -- Sigma0 --
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38 ------------
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39
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40 function Sigma0 (X : Word) return Word is
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41 begin
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42 return Rotate_Right (X, 2)
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43 xor Rotate_Right (X, 13)
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44 xor Rotate_Right (X, 22);
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45 end Sigma0;
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46
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47 ------------
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48 -- Sigma1 --
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49 ------------
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50
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51 function Sigma1 (X : Word) return Word is
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52 begin
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53 return Rotate_Right (X, 6)
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54 xor Rotate_Right (X, 11)
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55 xor Rotate_Right (X, 25);
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56 end Sigma1;
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57
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58 --------
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59 -- S0 --
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60 --------
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61
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62 function S0 (X : Word) return Word is
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63 begin
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64 return Rotate_Right (X, 7)
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65 xor Rotate_Right (X, 18)
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66 xor Shift_Right (X, 3);
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67 end S0;
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68
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69 --------
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70 -- S1 --
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71 --------
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72
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73 function S1 (X : Word) return Word is
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74 begin
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75 return Rotate_Right (X, 17)
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76 xor Rotate_Right (X, 19)
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77 xor Shift_Right (X, 10);
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78 end S1;
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79
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80 end GNAT.Secure_Hashes.SHA2_32;
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