gcc/ada/g-sha256.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT LIBRARY COMPONENTS                          --
   4 --                                                                          --
   5 --                          G N A T . S H A 2 5 6                           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   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 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  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 --  This package implaments the SHA-256 secure hash function as decsribed in
  33 --  FIPS PUB 180-3. The complete text of FIPS PUB 180-3 can be found at:
  34 --    http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
  35
  36 --  See the declaration of GNAT.Secure_Hashes.H in g-sechas.ads for complete
  37 --  documentation.
  38
  39 with GNAT.Secure_Hashes.SHA2_Common;
  40 with GNAT.Secure_Hashes.SHA2_32;
  41 with System;
  42
  43 package GNAT.SHA256 is new GNAT.Secure_Hashes.H
  44   (Block_Words    => GNAT.Secure_Hashes.SHA2_Common.Block_Words,
  45    State_Words    => 8,
  46    Hash_Words     => 8,
  47    Hash_Bit_Order => System.High_Order_First,
  48    Hash_State     => GNAT.Secure_Hashes.SHA2_32.Hash_State,
  49    Initial_State  => GNAT.Secure_Hashes.SHA2_32.SHA256_Init_State,
  50    Transform      => GNAT.Secure_Hashes.SHA2_32.Transform);