gcc/ada/g-shsh32.ads

   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 _ 3 2            --
   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 support for the 32-bit FIPS PUB 180-3 functions
  33 --  SHA-224 and SHA-256.
  34
  35 --  This is an internal unit and should not be used directly in applications.
  36 --  Use GNAT.SHA224 and GNAT.SHA256 instead.
  37
  38 with Interfaces;
  39 with GNAT.Byte_Swapping;
  40 with GNAT.Secure_Hashes.SHA2_Common;
  41
  42 package GNAT.Secure_Hashes.SHA2_32 is
  43
  44    subtype Word is Interfaces.Unsigned_32;
  45
  46    package Hash_State is new Hash_Function_State
  47      (Word           => Word,
  48       Swap           => GNAT.Byte_Swapping.Swap4,
  49       Hash_Bit_Order => System.High_Order_First);
  50    --  SHA-224 and SHA-256 operate on 32-bit big endian words
  51
  52    K : constant Hash_State.State (0 .. 63) :=
  53          (16#428a2f98#, 16#71374491#, 16#b5c0fbcf#, 16#e9b5dba5#,
  54           16#3956c25b#, 16#59f111f1#, 16#923f82a4#, 16#ab1c5ed5#,
  55           16#d807aa98#, 16#12835b01#, 16#243185be#, 16#550c7dc3#,
  56           16#72be5d74#, 16#80deb1fe#, 16#9bdc06a7#, 16#c19bf174#,
  57           16#e49b69c1#, 16#efbe4786#, 16#0fc19dc6#, 16#240ca1cc#,
  58           16#2de92c6f#, 16#4a7484aa#, 16#5cb0a9dc#, 16#76f988da#,
  59           16#983e5152#, 16#a831c66d#, 16#b00327c8#, 16#bf597fc7#,
  60           16#c6e00bf3#, 16#d5a79147#, 16#06ca6351#, 16#14292967#,
  61           16#27b70a85#, 16#2e1b2138#, 16#4d2c6dfc#, 16#53380d13#,
  62           16#650a7354#, 16#766a0abb#, 16#81c2c92e#, 16#92722c85#,
  63           16#a2bfe8a1#, 16#a81a664b#, 16#c24b8b70#, 16#c76c51a3#,
  64           16#d192e819#, 16#d6990624#, 16#f40e3585#, 16#106aa070#,
  65           16#19a4c116#, 16#1e376c08#, 16#2748774c#, 16#34b0bcb5#,
  66           16#391c0cb3#, 16#4ed8aa4a#, 16#5b9cca4f#, 16#682e6ff3#,
  67           16#748f82ee#, 16#78a5636f#, 16#84c87814#, 16#8cc70208#,
  68           16#90befffa#, 16#a4506ceb#, 16#bef9a3f7#, 16#c67178f2#);
  69    --  Constants from FIPS PUB 180-3
  70
  71    function Sigma0 (X : Word) return Word;
  72    function Sigma1 (X : Word) return Word;
  73    function S0 (X : Word) return Word;
  74    function S1 (X : Word) return Word;
  75    pragma Inline (Sigma0, Sigma1, S0, S1);
  76    --  Elementary functions Sigma^256_0, Sigma^256_1, sigma^256_0, sigma^256_1
  77    --  from FIPS PUB 180-3.
  78
  79    procedure Transform is new SHA2_Common.Transform
  80      (Hash_State => Hash_State,
  81       K          => K,
  82       Rounds     => 64,
  83       Sigma0     => Sigma0,
  84       Sigma1     => Sigma1,
  85       S0         => S0,
  86       S1         => S1);
  87
  88    SHA224_Init_State : constant Hash_State.State (0 .. 7) :=
  89                          (0 => 16#c1059ed8#,
  90                           1 => 16#367cd507#,
  91                           2 => 16#3070dd17#,
  92                           3 => 16#f70e5939#,
  93                           4 => 16#ffc00b31#,
  94                           5 => 16#68581511#,
  95                           6 => 16#64f98fa7#,
  96                           7 => 16#befa4fa4#);
  97    SHA256_Init_State : constant Hash_State.State (0 .. 7) :=
  98                          (0 => 16#6a09e667#,
  99                           1 => 16#bb67ae85#,
 100                           2 => 16#3c6ef372#,
 101                           3 => 16#a54ff53a#,
 102                           4 => 16#510e527f#,
 103                           5 => 16#9b05688c#,
 104                           6 => 16#1f83d9ab#,
 105                           7 => 16#5be0cd19#);
 106    --  Initialization vectors from FIPS PUB 180-3
 107
 108 end GNAT.Secure_Hashes.SHA2_32;