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   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 _ C O M M O N        --
   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 provides supporting code for implementation of the following
  33 --  secure hash functions described in FIPS PUB 180-3: SHA-224, SHA-256,
  34 --  SHA-384, SHA-512. It contains the generic transform operation that is
  35 --  common to the above four functions. The complete text of FIPS PUB 180-3
  36 --  can be found at:
  37 --    http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
  38
  39 --  This is an internal unit and should not be used directly in applications.
  40 --  Use GNAT.SHA* instead.
  41
  42 package GNAT.Secure_Hashes.SHA2_Common is
  43
  44    Block_Words : constant := 16;
  45    --  All functions operate on blocks of 16 words
  46
  47    generic
  48       with package Hash_State is new Hash_Function_State (<>);
  49
  50       Rounds : Natural;
  51       --  Number of transformation rounds
  52
  53       K : Hash_State.State;
  54       --  Constants used in the transform operation
  55
  56       with function Sigma0 (X : Hash_State.Word) return Hash_State.Word is <>;
  57       with function Sigma1 (X : Hash_State.Word) return Hash_State.Word is <>;
  58       with function S0 (X : Hash_State.Word) return Hash_State.Word is <>;
  59       with function S1 (X : Hash_State.Word) return Hash_State.Word is <>;
  60       --  FIPS PUB 180-3 elementary functions
  61
  62    procedure Transform
  63      (H_St : in out Hash_State.State;
  64       M_St : in out Message_State);
  65
  66 end GNAT.Secure_Hashes.SHA2_Common;