| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- G N A T . M D 5 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2002 Ada Core Technologies, 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 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, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, 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. |
| |
| 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 |
| Convert (C.A); |
| Convert (C.B); |
| Convert (C.C); |
| Convert (C.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 |
| Cur : Positive := Input'First; |
| Last_Block : String (1 .. 64); |
| |
| begin |
| while Cur + 63 <= Input'Last loop |
| Transform (C, Input (Cur .. Cur + 63)); |
| Cur := Cur + 64; |
| end loop; |
| |
| Last_Block (1 .. Input'Last - Cur + 1) := Input (Cur .. Input'Last); |
| |
| if Input'Last - Cur + 1 > 56 then |
| Cur := Input'Last - Cur + 2; |
| Last_Block (Cur .. 64) := Padding (1 .. 64 - Cur + 1); |
| Transform (C, Last_Block); |
| Last_Block := (others => ASCII.NUL); |
| |
| else |
| Cur := Input'Last - Cur + 2; |
| Last_Block (Cur .. 56) := Padding (1 .. 56 - Cur + 1); |
| end if; |
| |
| -- Add the input length as 8 characters |
| |
| Last_Block (57 .. 64) := (others => ASCII.NUL); |
| |
| declare |
| L : Unsigned_64 := Unsigned_64 (Input'Length) * 8; |
| |
| begin |
| Cur := 57; |
| while L > 0 loop |
| Last_Block (Cur) := Character'Val (L and 16#Ff#); |
| L := Shift_Right (L, 8); |
| Cur := Cur + 1; |
| end loop; |
| end; |
| |
| Transform (C, Last_Block); |
| 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; |
