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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;
|
