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------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- G N A T . S E C U R E _ H A S H E S . M D 5 -- -- -- -- B o d y -- -- -- -- Copyright (C) 2002-2009, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with GNAT.Byte_Swapping; use GNAT.Byte_Swapping; package body GNAT.Secure_Hashes.MD5 is use Interfaces; -- The sixteen values used to rotate the context words. Four for each -- rounds. Used in procedure Transform. -- Round 1 S11 : constant := 7; S12 : constant := 12; S13 : constant := 17; S14 : constant := 22; -- Round 2 S21 : constant := 5; S22 : constant := 9; S23 : constant := 14; S24 : constant := 20; -- Round 3 S31 : constant := 4; S32 : constant := 11; S33 : constant := 16; S34 : constant := 23; -- Round 4 S41 : constant := 6; S42 : constant := 10; S43 : constant := 15; S44 : constant := 21; -- The following functions (F, FF, G, GG, H, HH, I and II) are the -- equivalent of the macros of the same name in the example C -- implementation in the annex of RFC 1321. function F (X, Y, Z : Unsigned_32) return Unsigned_32; pragma Inline (F); procedure FF (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive); pragma Inline (FF); function G (X, Y, Z : Unsigned_32) return Unsigned_32; pragma Inline (G); procedure GG (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive); pragma Inline (GG); function H (X, Y, Z : Unsigned_32) return Unsigned_32; pragma Inline (H); procedure HH (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive); pragma Inline (HH); function I (X, Y, Z : Unsigned_32) return Unsigned_32; pragma Inline (I); procedure II (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive); pragma Inline (II); ------- -- F -- ------- function F (X, Y, Z : Unsigned_32) return Unsigned_32 is begin return (X and Y) or ((not X) and Z); end F; -------- -- FF -- -------- procedure FF (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive) is begin A := A + F (B, C, D) + X + AC; A := Rotate_Left (A, S); A := A + B; end FF; ------- -- G -- ------- function G (X, Y, Z : Unsigned_32) return Unsigned_32 is begin return (X and Z) or (Y and (not Z)); end G; -------- -- GG -- -------- procedure GG (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive) is begin A := A + G (B, C, D) + X + AC; A := Rotate_Left (A, S); A := A + B; end GG; ------- -- H -- ------- function H (X, Y, Z : Unsigned_32) return Unsigned_32 is begin return X xor Y xor Z; end H; -------- -- HH -- -------- procedure HH (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive) is begin A := A + H (B, C, D) + X + AC; A := Rotate_Left (A, S); A := A + B; end HH; ------- -- I -- ------- function I (X, Y, Z : Unsigned_32) return Unsigned_32 is begin return Y xor (X or (not Z)); end I; -------- -- II -- -------- procedure II (A : in out Unsigned_32; B, C, D : Unsigned_32; X : Unsigned_32; AC : Unsigned_32; S : Positive) is begin A := A + I (B, C, D) + X + AC; A := Rotate_Left (A, S); A := A + B; end II; --------------- -- Transform -- --------------- procedure Transform (H : in out Hash_State.State; M : in out Message_State) is use System; X : array (0 .. 15) of Interfaces.Unsigned_32; for X'Address use M.Buffer'Address; pragma Import (Ada, X); AA : Unsigned_32 := H (0); BB : Unsigned_32 := H (1); CC : Unsigned_32 := H (2); DD : Unsigned_32 := H (3); begin if Default_Bit_Order /= Low_Order_First then for J in X'Range loop Swap4 (X (J)'Address); end loop; end if; -- Round 1 FF (AA, BB, CC, DD, X (00), 16#D76aa478#, S11); -- 1 FF (DD, AA, BB, CC, X (01), 16#E8c7b756#, S12); -- 2 FF (CC, DD, AA, BB, X (02), 16#242070db#, S13); -- 3 FF (BB, CC, DD, AA, X (03), 16#C1bdceee#, S14); -- 4 FF (AA, BB, CC, DD, X (04), 16#f57c0faf#, S11); -- 5 FF (DD, AA, BB, CC, X (05), 16#4787c62a#, S12); -- 6 FF (CC, DD, AA, BB, X (06), 16#a8304613#, S13); -- 7 FF (BB, CC, DD, AA, X (07), 16#fd469501#, S14); -- 8 FF (AA, BB, CC, DD, X (08), 16#698098d8#, S11); -- 9 FF (DD, AA, BB, CC, X (09), 16#8b44f7af#, S12); -- 10 FF (CC, DD, AA, BB, X (10), 16#ffff5bb1#, S13); -- 11 FF (BB, CC, DD, AA, X (11), 16#895cd7be#, S14); -- 12 FF (AA, BB, CC, DD, X (12), 16#6b901122#, S11); -- 13 FF (DD, AA, BB, CC, X (13), 16#fd987193#, S12); -- 14 FF (CC, DD, AA, BB, X (14), 16#a679438e#, S13); -- 15 FF (BB, CC, DD, AA, X (15), 16#49b40821#, S14); -- 16 -- Round 2 GG (AA, BB, CC, DD, X (01), 16#f61e2562#, S21); -- 17 GG (DD, AA, BB, CC, X (06), 16#c040b340#, S22); -- 18 GG (CC, DD, AA, BB, X (11), 16#265e5a51#, S23); -- 19 GG (BB, CC, DD, AA, X (00), 16#e9b6c7aa#, S24); -- 20 GG (AA, BB, CC, DD, X (05), 16#d62f105d#, S21); -- 21 GG (DD, AA, BB, CC, X (10), 16#02441453#, S22); -- 22 GG (CC, DD, AA, BB, X (15), 16#d8a1e681#, S23); -- 23 GG (BB, CC, DD, AA, X (04), 16#e7d3fbc8#, S24); -- 24 GG (AA, BB, CC, DD, X (09), 16#21e1cde6#, S21); -- 25 GG (DD, AA, BB, CC, X (14), 16#c33707d6#, S22); -- 26 GG (CC, DD, AA, BB, X (03), 16#f4d50d87#, S23); -- 27 GG (BB, CC, DD, AA, X (08), 16#455a14ed#, S24); -- 28 GG (AA, BB, CC, DD, X (13), 16#a9e3e905#, S21); -- 29 GG (DD, AA, BB, CC, X (02), 16#fcefa3f8#, S22); -- 30 GG (CC, DD, AA, BB, X (07), 16#676f02d9#, S23); -- 31 GG (BB, CC, DD, AA, X (12), 16#8d2a4c8a#, S24); -- 32 -- Round 3 HH (AA, BB, CC, DD, X (05), 16#fffa3942#, S31); -- 33 HH (DD, AA, BB, CC, X (08), 16#8771f681#, S32); -- 34 HH (CC, DD, AA, BB, X (11), 16#6d9d6122#, S33); -- 35 HH (BB, CC, DD, AA, X (14), 16#fde5380c#, S34); -- 36 HH (AA, BB, CC, DD, X (01), 16#a4beea44#, S31); -- 37 HH (DD, AA, BB, CC, X (04), 16#4bdecfa9#, S32); -- 38 HH (CC, DD, AA, BB, X (07), 16#f6bb4b60#, S33); -- 39 HH (BB, CC, DD, AA, X (10), 16#bebfbc70#, S34); -- 40 HH (AA, BB, CC, DD, X (13), 16#289b7ec6#, S31); -- 41 HH (DD, AA, BB, CC, X (00), 16#eaa127fa#, S32); -- 42 HH (CC, DD, AA, BB, X (03), 16#d4ef3085#, S33); -- 43 HH (BB, CC, DD, AA, X (06), 16#04881d05#, S34); -- 44 HH (AA, BB, CC, DD, X (09), 16#d9d4d039#, S31); -- 45 HH (DD, AA, BB, CC, X (12), 16#e6db99e5#, S32); -- 46 HH (CC, DD, AA, BB, X (15), 16#1fa27cf8#, S33); -- 47 HH (BB, CC, DD, AA, X (02), 16#c4ac5665#, S34); -- 48 -- Round 4 II (AA, BB, CC, DD, X (00), 16#f4292244#, S41); -- 49 II (DD, AA, BB, CC, X (07), 16#432aff97#, S42); -- 50 II (CC, DD, AA, BB, X (14), 16#ab9423a7#, S43); -- 51 II (BB, CC, DD, AA, X (05), 16#fc93a039#, S44); -- 52 II (AA, BB, CC, DD, X (12), 16#655b59c3#, S41); -- 53 II (DD, AA, BB, CC, X (03), 16#8f0ccc92#, S42); -- 54 II (CC, DD, AA, BB, X (10), 16#ffeff47d#, S43); -- 55 II (BB, CC, DD, AA, X (01), 16#85845dd1#, S44); -- 56 II (AA, BB, CC, DD, X (08), 16#6fa87e4f#, S41); -- 57 II (DD, AA, BB, CC, X (15), 16#fe2ce6e0#, S42); -- 58 II (CC, DD, AA, BB, X (06), 16#a3014314#, S43); -- 59 II (BB, CC, DD, AA, X (13), 16#4e0811a1#, S44); -- 60 II (AA, BB, CC, DD, X (04), 16#f7537e82#, S41); -- 61 II (DD, AA, BB, CC, X (11), 16#bd3af235#, S42); -- 62 II (CC, DD, AA, BB, X (02), 16#2ad7d2bb#, S43); -- 63 II (BB, CC, DD, AA, X (09), 16#eb86d391#, S44); -- 64 H (0) := H (0) + AA; H (1) := H (1) + BB; H (2) := H (2) + CC; H (3) := H (3) + DD; end Transform; end GNAT.Secure_Hashes.MD5;