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MD5.pas
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MD5.pas
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unit MD5;
(*******************************************************************************
* *
* Author : Angus Johnson *
* Version : 1.2 *
* Date : 12 February 2024 *
* Website : http://www.angusj.com *
* Copyright : Angus Johnson 2010-2024 *
* *
* License: *
* Use, modification & distribution is subject to Boost Software License Ver 1. *
* http://www.boost.org/LICENSE_1_0.txt *
* *
*******************************************************************************)
interface
{$Q-}
uses
Windows, SysUtils, Classes;
const
BuffLen64 = 64;
type
{$IFNDEF UNICODE}
PByte = PChar;
{$ENDIF}
PByteArray = ^TByteArray;
TByteArray = array[0..MaxInt-1] of Byte;
TByteArray16 = array [0..15] of Byte;
Md5Record = record
private
state : array [0..3] of cardinal;
count : array [0..1] of cardinal;
digest : TByteArray16;
buffer64 : array [0..BuffLen64 -1] of Byte;
procedure Transform;
procedure F1(var a: cardinal; b, c, d, x, s: cardinal);
procedure F2(var a: cardinal; b, c, d, x, s: cardinal);
procedure F3(var a: cardinal; b, c, d, x, s: cardinal);
procedure F4(var a: cardinal; b, c, d, x, s: cardinal);
public
procedure Init;
procedure Update(start: PByteArray; length: cardinal);
procedure Finalize;
property Hash: TByteArray16 read digest;
end;
implementation
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
procedure Md5Record.Init;
begin
count[0] := 0;
count[1] := 0;
//Load magic constants ...
state[0] := $67452301;
state[1] := $efcdab89;
state[2] := $98badcfe;
state[3] := $10325476;
end;
//------------------------------------------------------------------------------
procedure Md5Record.Finalize;
var
cnt: cardinal;
pb : system.PByte;
begin
cnt := (count[0] shr 3) and $3f;
pb := @buffer64[cnt];
pb^ := $80;
inc(pb);
cnt := 63 - cnt;
if cnt < 8 then
begin
// Two lots of padding: Pad the first block to 64 bytes */
FillChar(pb^, cnt, 0);
Transform;
// Now fill the next block with 56 bytes */
FillChar(buffer64[0], 56, 0);
end
else if cnt > 8 then
FillChar(pb^, cnt -8, 0);
// Append length in bits and transform ...
move(count[0], buffer64[56], 4);
move(count[1], buffer64[60], 4);
Transform;
move(state[0], digest[0], 16);
end;
//------------------------------------------------------------------------------
procedure Md5Record.Transform;
var
a,b,c,d: cardinal;
x: array[0..15] of cardinal;
begin
Move(buffer64[0], x[0], BuffLen64);
a := state[0]; b := state[1]; c := state[2]; d := state[3];
// Round 1 ...
F1 (a, b, c, d, x[ 0] + $d76aa478, 7);
F1 (d, a, b, c, x[ 1] + $e8c7b756, 12);
F1 (c, d, a, b, x[ 2] + $242070db, 17);
F1 (b, c, d, a, x[ 3] + $c1bdceee, 22);
F1 (a, b, c, d, x[ 4] + $f57c0faf, 7);
F1 (d, a, b, c, x[ 5] + $4787c62a, 12);
F1 (c, d, a, b, x[ 6] + $a8304613, 17);
F1 (b, c, d, a, x[ 7] + $fd469501, 22);
F1 (a, b, c, d, x[ 8] + $698098d8, 7);
F1 (d, a, b, c, x[ 9] + $8b44f7af, 12);
F1 (c, d, a, b, x[10] + $ffff5bb1, 17);
F1 (b, c, d, a, x[11] + $895cd7be, 22);
F1 (a, b, c, d, x[12] + $6b901122, 7);
F1 (d, a, b, c, x[13] + $fd987193, 12);
F1 (c, d, a, b, x[14] + $a679438e, 17);
F1 (b, c, d, a, x[15] + $49b40821, 22);
// Round 2 ...
F2 (a, b, c, d, x[ 1] + $f61e2562, 5);
F2 (d, a, b, c, x[ 6] + $c040b340, 9);
F2 (c, d, a, b, x[11] + $265e5a51, 14);
F2 (b, c, d, a, x[ 0] + $e9b6c7aa, 20);
F2 (a, b, c, d, x[ 5] + $d62f105d, 5);
F2 (d, a, b, c, x[10] + $02441453, 9);
F2 (c, d, a, b, x[15] + $d8a1e681, 14);
F2 (b, c, d, a, x[ 4] + $e7d3fbc8, 20);
F2 (a, b, c, d, x[ 9] + $21e1cde6, 5);
F2 (d, a, b, c, x[14] + $c33707d6, 9);
F2 (c, d, a, b, x[ 3] + $f4d50d87, 14);
F2 (b, c, d, a, x[ 8] + $455a14ed, 20);
F2 (a, b, c, d, x[13] + $a9e3e905, 5);
F2 (d, a, b, c, x[ 2] + $fcefa3f8, 9);
F2 (c, d, a, b, x[ 7] + $676f02d9, 14);
F2 (b, c, d, a, x[12] + $8d2a4c8a, 20);
// Round 3 ..
F3 (a, b, c, d, x[ 5] + $fffa3942, 4);
F3 (d, a, b, c, x[ 8] + $8771f681, 11);
F3 (c, d, a, b, x[11] + $6d9d6122, 16);
F3 (b, c, d, a, x[14] + $fde5380c, 23);
F3 (a, b, c, d, x[ 1] + $a4beea44, 4);
F3 (d, a, b, c, x[ 4] + $4bdecfa9, 11);
F3 (c, d, a, b, x[ 7] + $f6bb4b60, 16);
F3 (b, c, d, a, x[10] + $bebfbc70, 23);
F3 (a, b, c, d, x[13] + $289b7ec6, 4);
F3 (d, a, b, c, x[ 0] + $eaa127fa, 11);
F3 (c, d, a, b, x[ 3] + $d4ef3085, 16);
F3 (b, c, d, a, x[ 6] + $4881d05, 23);
F3 (a, b, c, d, x[ 9] + $d9d4d039, 4);
F3 (d, a, b, c, x[12] + $e6db99e5, 11);
F3 (c, d, a, b, x[15] + $1fa27cf8, 16);
F3 (b, c, d, a, x[ 2] + $c4ac5665, 23);
// Round 4 ..
F4 (a, b, c, d, x[ 0] + $f4292244, 6);
F4 (d, a, b, c, x[ 7] + $432aff97, 10);
F4 (c, d, a, b, x[14] + $ab9423a7, 15);
F4 (b, c, d, a, x[ 5] + $fc93a039, 21);
F4 (a, b, c, d, x[12] + $655b59c3, 6);
F4 (d, a, b, c, x[ 3] + $8f0ccc92, 10);
F4 (c, d, a, b, x[10] + $ffeff47d, 15);
F4 (b, c, d, a, x[ 1] + $85845dd1, 21);
F4 (a, b, c, d, x[ 8] + $6fa87e4f, 6);
F4 (d, a, b, c, x[15] + $fe2ce6e0, 10);
F4 (c, d, a, b, x[ 6] + $a3014314, 15);
F4 (b, c, d, a, x[13] + $4e0811a1, 21);
F4 (a, b, c, d, x[ 4] + $f7537e82, 6);
F4 (d, a, b, c, x[11] + $bd3af235, 10);
F4 (c, d, a, b, x[ 2] + $2ad7d2bb, 15);
F4 (b, c, d, a, x[ 9] + $eb86d391, 21);
inc(state[0], a);
inc(state[1], b);
inc(state[2], c);
inc(state[3], d);
end;
//------------------------------------------------------------------------------
procedure Md5Record.Update(start: PByteArray; length: cardinal);
var
t, idx, spc: cardinal;
//sl: TStringList;
begin
// Update number of bits
t := count[0];
count[0] := t + (length shl 3);
if count[0] < t then inc(count[1]);
inc(count[1], length shr 29);
// Compute number of bytes mod 64
idx := (t shr 3) and $3f;
spc := BuffLen64 - idx;
if idx > 0 then
begin
if (length < spc) then
begin
move(start^, buffer64[idx], length);
exit;
end;
move(start^, buffer64[idx], spc);
Transform;
dec(length, spc);
inc(PByte(start), spc);
end;
//Process data in 64-byte chunks ...
while (length >= BuffLen64) do
begin
move(start^, buffer64[0], BuffLen64);
Transform;
dec(length, BuffLen64);
inc(PByte(start), BuffLen64);
end;
//Finally, handle any remaining bytes of data ...
move(start^, buffer64[0], length);
end;
//------------------------------------------------------------------------------
procedure Md5Record.F1(var a: cardinal; b, c, d, x, s: cardinal);
begin
inc(a, (d xor (b and (c xor d))) + x);
a := ((a shl s) or (a shr (32-s))) + b;
end;
//------------------------------------------------------------------------------
procedure Md5Record.F2(var a: cardinal; b, c, d, x, s: cardinal);
begin
inc(a, ((b and d) or (c and not d)) + x);
a := ((a shl s) or (a shr (32-s))) + b;
end;
//------------------------------------------------------------------------------
procedure Md5Record.F3(var a: cardinal; b, c, d, x, s: cardinal);
begin
inc(a, (b xor c xor d) + x);
a := ((a shl s) or (a shr (32-s))) + b;
end;
//------------------------------------------------------------------------------
procedure Md5Record.F4(var a: cardinal; b, c, d, x, s: cardinal);
begin
inc(a, (c xor (b or not d)) + x);
a := ((a shl s) or (a shr (32-s))) + b;
end;
//------------------------------------------------------------------------------
end.