gcc/ada/libgnat/g-sehamd.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 . M D 5                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --         Copyright (C) 2002-2017, 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.                                     --
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  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 MD5
  33 --  Message-Digest Algorithm as described in RFC 1321. The complete text of
  34 --  RFC 1321 can be found at:
  35 --          http://www.ietf.org/rfc/rfc1321.txt
  36
  37 --  This is an internal unit and should not be used directly in applications.
  38 --  Use GNAT.MD5 instead.
  39
  40 with GNAT.Byte_Swapping;
  41 with Interfaces;
  42
  43 package GNAT.Secure_Hashes.MD5 is
  44
  45    package Hash_State is
  46      new GNAT.Secure_Hashes.Hash_Function_State
  47            (Word           => Interfaces.Unsigned_32,
  48             Swap           => GNAT.Byte_Swapping.Swap4,
  49             Hash_Bit_Order => System.Low_Order_First);
  50    --  MD5 operates on 32-bit little endian words
  51
  52    Block_Words : constant := 16;
  53    --  Messages are processed in chunks of 16 words
  54
  55    procedure Transform
  56      (H : in out Hash_State.State;
  57       M : in out Message_State);
  58    --  Transformation function applied for each block
  59
  60    Initial_State : constant Hash_State.State;
  61    --  Initialization vector
  62
  63 private
  64
  65    Initial_A : constant := 16#67452301#;
  66    Initial_B : constant := 16#EFCDAB89#;
  67    Initial_C : constant := 16#98BADCFE#;
  68    Initial_D : constant := 16#10325476#;
  69
  70    Initial_State : constant Hash_State.State :=
  71                      (Initial_A, Initial_B, Initial_C, Initial_D);
  72    --  Initialization vector from RFC 1321
  73
  74 end GNAT.Secure_Hashes.MD5;