------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- G N A T . M D 5 -- -- -- -- B o d y -- -- -- -- Copyright (C) 2002-2006, AdaCore -- -- -- -- 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 2, 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Ada.Unchecked_Conversion; package body GNAT.MD5 is use Interfaces; Padding : constant String := (1 => Character'Val (16#80#), 2 .. 64 => ASCII.NUL); Hex_Digit : constant array (Unsigned_32 range 0 .. 15) of Character := ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'); -- Look-up table for each hex digit of the Message-Digest. -- Used by function Digest (Context). -- The sixten 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; type Sixteen_Words is array (Natural range 0 .. 15) of Interfaces.Unsigned_32; -- Sixteen 32-bit words, converted from block of 64 characters. -- Used in procedure Decode and Transform. procedure Decode (Block : String; X : out Sixteen_Words); -- Convert a String of 64 characters into 16 32-bit numbers -- 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); procedure Transform (C : in out Context; Block : String); -- Process one block of 64 characters ------------ -- Decode -- ------------ procedure Decode (Block : String; X : out Sixteen_Words) is Cur : Positive := Block'First; begin pragma Assert (Block'Length = 64); for Index in X'Range loop X (Index) := Unsigned_32 (Character'Pos (Block (Cur))) + Shift_Left (Unsigned_32 (Character'Pos (Block (Cur + 1))), 8) + Shift_Left (Unsigned_32 (Character'Pos (Block (Cur + 2))), 16) + Shift_Left (Unsigned_32 (Character'Pos (Block (Cur + 3))), 24); Cur := Cur + 4; end loop; end Decode; ------------ -- Digest -- ------------ function Digest (C : Context) return Message_Digest is Result : Message_Digest; Cur : Natural := 1; -- Index in Result where the next character will be placed Last_Block : String (1 .. 64); C1 : Context := C; procedure Convert (X : Unsigned_32); -- Put the contribution of one of the four words (A, B, C, D) of the -- Context in Result. Increments Cur. ------------- -- Convert -- ------------- procedure Convert (X : Unsigned_32) is Y : Unsigned_32 := X; begin for J in 1 .. 4 loop Result (Cur + 1) := Hex_Digit (Y and Unsigned_32'(16#0F#)); Y := Shift_Right (Y, 4); Result (Cur) := Hex_Digit (Y and Unsigned_32'(16#0F#)); Y := Shift_Right (Y, 4); Cur := Cur + 2; end loop; end Convert; -- Start of processing for Digest begin -- Process characters in the context buffer, if any Last_Block (1 .. C.Last) := C.Buffer (1 .. C.Last); -- Too many magic literals below, should be defined as constants ??? if C.Last > 55 then Last_Block (C.Last + 1 .. 64) := Padding (1 .. 64 - C.Last); Transform (C1, Last_Block); Last_Block := (others => ASCII.NUL); else Last_Block (C.Last + 1 .. 56) := Padding (1 .. 56 - C.Last); end if; -- Add the input length (as stored in the context) as 8 characters Last_Block (57 .. 64) := (others => ASCII.NUL); declare L : Unsigned_64 := Unsigned_64 (C.Length) * 8; Idx : Positive := 57; begin while L > 0 loop Last_Block (Idx) := Character'Val (L and 16#Ff#); L := Shift_Right (L, 8); Idx := Idx + 1; end loop; end; Transform (C1, Last_Block); Convert (C1.A); Convert (C1.B); Convert (C1.C); Convert (C1.D); return Result; end Digest; function Digest (S : String) return Message_Digest is C : Context; begin Update (C, S); return Digest (C); end Digest; function Digest (A : Ada.Streams.Stream_Element_Array) return Message_Digest is C : Context; begin Update (C, A); return Digest (C); end Digest; ------- -- 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 (C : in out Context; Block : String) is X : Sixteen_Words; AA : Unsigned_32 := C.A; BB : Unsigned_32 := C.B; CC : Unsigned_32 := C.C; DD : Unsigned_32 := C.D; begin pragma Assert (Block'Length = 64); Decode (Block, X); -- 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 C.A := C.A + AA; C.B := C.B + BB; C.C := C.C + CC; C.D := C.D + DD; end Transform; ------------ -- Update -- ------------ procedure Update (C : in out Context; Input : String) is Inp : constant String := C.Buffer (1 .. C.Last) & Input; Cur : Positive := Inp'First; begin C.Length := C.Length + Input'Length; while Cur + 63 <= Inp'Last loop Transform (C, Inp (Cur .. Cur + 63)); Cur := Cur + 64; end loop; C.Last := Inp'Last - Cur + 1; C.Buffer (1 .. C.Last) := Inp (Cur .. Inp'Last); end Update; procedure Update (C : in out Context; Input : Ada.Streams.Stream_Element_Array) is subtype Stream_Array is Ada.Streams.Stream_Element_Array (Input'Range); subtype Stream_String is String (1 + Integer (Input'First) .. 1 + Integer (Input'Last)); function To_String is new Ada.Unchecked_Conversion (Stream_Array, Stream_String); String_Input : constant String := To_String (Input); begin Update (C, String_Input); end Update; ----------------- -- Wide_Digest -- ----------------- function Wide_Digest (W : Wide_String) return Message_Digest is C : Context; begin Wide_Update (C, W); return Digest (C); end Wide_Digest; ----------------- -- Wide_Update -- ----------------- procedure Wide_Update (C : in out Context; Input : Wide_String) is String_Input : String (1 .. 2 * Input'Length); Cur : Positive := 1; begin for Index in Input'Range loop String_Input (Cur) := Character'Val (Unsigned_32 (Wide_Character'Pos (Input (Index))) and 16#FF#); Cur := Cur + 1; String_Input (Cur) := Character'Val (Shift_Right (Unsigned_32 (Wide_Character'Pos (Input (Index))), 8) and 16#FF#); Cur := Cur + 1; end loop; Update (C, String_Input); end Wide_Update; end GNAT.MD5;