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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . S E C U R E _ H A S H E S . M D 5 --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2002-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides supporting code for implementation of the MD5
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33 -- Message-Digest Algorithm as described in RFC 1321. The complete text of
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34 -- RFC 1321 can be found at:
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35 -- http://www.ietf.org/rfc/rfc1321.txt
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36
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37 -- This is an internal unit and should not be used directly in applications.
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38 -- Use GNAT.MD5 instead.
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39
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40 with GNAT.Byte_Swapping;
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41 with Interfaces;
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42
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43 package GNAT.Secure_Hashes.MD5 is
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44
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45 package Hash_State is
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46 new GNAT.Secure_Hashes.Hash_Function_State
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47 (Word => Interfaces.Unsigned_32,
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48 Swap => GNAT.Byte_Swapping.Swap4,
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49 Hash_Bit_Order => System.Low_Order_First);
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50 -- MD5 operates on 32-bit little endian words
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51
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52 Block_Words : constant := 16;
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53 -- Messages are processed in chunks of 16 words
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54
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55 procedure Transform
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56 (H : in out Hash_State.State;
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57 M : in out Message_State);
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58 -- Transformation function applied for each block
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59
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60 Initial_State : constant Hash_State.State;
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61 -- Initialization vector
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62
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63 private
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64
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65 Initial_A : constant := 16#67452301#;
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66 Initial_B : constant := 16#EFCDAB89#;
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67 Initial_C : constant := 16#98BADCFE#;
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68 Initial_D : constant := 16#10325476#;
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69
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70 Initial_State : constant Hash_State.State :=
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71 (Initial_A, Initial_B, Initial_C, Initial_D);
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72 -- Initialization vector from RFC 1321
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73
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74 end GNAT.Secure_Hashes.MD5;
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