1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . S E C U R E _ H A S H E S . M D 5 --
9 -- Copyright (C) 2002-2009, Free Software Foundation, Inc. --
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. --
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. --
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/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
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
37 with GNAT.Byte_Swapping;
40 package System.Secure_Hashes.MD5 is
43 new System.Secure_Hashes.Hash_Function_State
44 (Word => Interfaces.Unsigned_32,
45 Swap => GNAT.Byte_Swapping.Swap4,
46 Hash_Bit_Order => System.Low_Order_First);
47 -- MD5 operates on 32-bit little endian words
49 Block_Words : constant := 16;
50 -- Messages are processed in chunks of 16 words
53 (H : in out Hash_State.State;
54 M : in out Message_State);
55 -- Transformation function applied for each block
57 Initial_State : constant Hash_State.State;
58 -- Initialization vector
62 Initial_A : constant := 16#67452301#;
63 Initial_B : constant := 16#EFCDAB89#;
64 Initial_C : constant := 16#98BADCFE#;
65 Initial_D : constant := 16#10325476#;
67 Initial_State : constant Hash_State.State :=
68 (Initial_A, Initial_B, Initial_C, Initial_D);
69 -- Initialization vector from RFC 1321
71 end System.Secure_Hashes.MD5;