SoLVeX

unit Umd5;

interface

uses Windows, SysUtils;

type
THash = DWord;
function md5 (buf: string): string;

implementation

var HEX: array[Word] of string;

function LRot32 (a, b: LongWord): LongWord;

asm
mov ecx, edx
rol eax, cl
end;

function md5 (buf: string): string;

type

pint = ^Integer;
tdata = array [0..15] of DWORD;
pdata = ^tdata;
tbyte = array [0..15] of byte;
pbyte = ^tbyte;

var

i, Len: Integer;
data: pdata;
CurrentHash: array[0..3] of DWord;
P: array[0..7] of Word absolute CurrentHash;
A, B, C, D: DWord;

begin

Len := Length (buf);
SetLength (buf, 64);
buf[Len+1] := #$80;
FillChar (buf[Len+2], 63 - Len, 0);
pint (@buf[57])^ := Len * 8;

CurrentHash[0] := $67452301;
CurrentHash[1] := $efcdab89;
CurrentHash[2] := $98badcfe;
CurrentHash[3] := $10325476;

A := CurrentHash[0];
B := CurrentHash[1];
C := CurrentHash[2];
D := CurrentHash[3];

data := addr (buf[1]);

A := B + LRot32 (A + (D xor (B and (C xor D))) + data^[ 0] + $d76aa478, 7);
D := A + LRot32 (D + (C xor (A and (B xor C))) + data^[ 1] + $e8c7b756, 12);
C := D + LRot32 (C + (B xor (D and (A xor B))) + data^[ 2] + $242070db, 17);
B := C + LRot32 (B + (A xor (C and (D xor A))) + data^[ 3] + $c1bdceee, 22);
A := B + LRot32 (A + (D xor (B and (C xor D))) + data^[ 4] + $f57c0faf, 7);
D := A + LRot32 (D + (C xor (A and (B xor C))) + data^[ 5] + $4787c62a, 12);
C := D + LRot32 (C + (B xor (D and (A xor B))) + data^[ 6] + $a8304613, 17);
B := C + LRot32 (B + (A xor (C and (D xor A))) + data^[ 7] + $fd469501, 22);
A := B + LRot32 (A + (D xor (B and (C xor D))) + data^[ 8] + $698098d8, 7);
D := A + LRot32 (D + (C xor (A and (B xor C))) + data^[ 9] + $8b44f7af, 12);
C := D + LRot32 (C + (B xor (D and (A xor B))) + data^[10] + $ffff5bb1, 17);
B := C + LRot32 (B + (A xor (C and (D xor A))) + data^[11] + $895cd7be, 22);
A := B + LRot32 (A + (D xor (B and (C xor D))) + data^[12] + $6b901122, 7);
D := A + LRot32 (D + (C xor (A and (B xor C))) + data^[13] + $fd987193, 12);
C := D + LRot32 (C + (B xor (D and (A xor B))) + data^[14] + $a679438e, 17);
B := C + LRot32 (B + (A xor (C and (D xor A))) + data^[15] + $49b40821, 22);

A := B + LRot32 (A + (C xor (D and (B xor C))) + data^[ 1] + $f61e2562, 5);
D := A + LRot32 (D + (B xor (C and (A xor B))) + data^[ 6] + $c040b340, 9);
C := D + LRot32 (C + (A xor (B and (D xor A))) + data^[11] + $265e5a51, 14);
B := C + LRot32 (B + (D xor (A and (C xor D))) + data^[ 0] + $e9b6c7aa, 20);
A := B + LRot32 (A + (C xor (D and (B xor C))) + data^[ 5] + $d62f105d, 5);
D := A + LRot32 (D + (B xor (C and (A xor B))) + data^[10] + $02441453, 9);
C := D + LRot32 (C + (A xor (B and (D xor A))) + data^[15] + $d8a1e681, 14);
B := C + LRot32 (B + (D xor (A and (C xor D))) + data^[ 4] + $e7d3fbc8, 20);
A := B + LRot32 (A + (C xor (D and (B xor C))) + data^[ 9] + $21e1cde6, 5);
D := A + LRot32 (D + (B xor (C and (A xor B))) + data^[14] + $c33707d6, 9);
C := D + LRot32 (C + (A xor (B and (D xor A))) + data^[ 3] + $f4d50d87, 14);
B := C + LRot32 (B + (D xor (A and (C xor D))) + data^[ 8] + $455a14ed, 20);

A := B + LRot32 (A + (C xor (D and (B xor C))) + data^[13] + $a9e3e905, 5);
D := A + LRot32 (D + (B xor (C and (A xor B))) + data^[ 2] + $fcefa3f8, 9);
C := D + LRot32 (C + (A xor (B and (D xor A))) + data^[ 7] + $676f02d9, 14);
B := C + LRot32 (B + (D xor (A and (C xor D))) + data^[12] + $8d2a4c8a, 20);
A := B + LRot32 (A + (B xor C xor D) + data^[ 5] + $fffa3942, 4);
D := A + LRot32 (D + (A xor B xor C) + data^[ 8] + $8771f681, 11);
C := D + LRot32 (C + (D xor A xor B) + data^[11] + $6d9d6122, 16);
B := C + LRot32 (B + (C xor D xor A) + data^[14] + $fde5380c, 23);
A := B + LRot32 (A + (B xor C xor D) + data^[ 1] + $a4beea44, 4);
D := A + LRot32 (D + (A xor B xor C) + data^[ 4] + $4bdecfa9, 11);
C := D + LRot32 (C + (D xor A xor B) + data^[ 7] + $f6bb4b60, 16);
B := C + LRot32 (B + (C xor D xor A) + data^[10] + $bebfbc70, 23);
A := B + LRot32 (A + (B xor C xor D) + data^[13] + $289b7ec6, 4);
D := A + LRot32 (D + (A xor B xor C) + data^[ 0] + $eaa127fa, 11);
C := D + LRot32 (C + (D xor A xor B) + data^[ 3] + $d4ef3085, 16);
B := C + LRot32 (B + (C xor D xor A) + data^[ 6] + $04881d05, 23);
A := B + LRot32 (A + (B xor C xor D) + data^[ 9] + $d9d4d039, 4);
D := A + LRot32 (D + (A xor B xor C) + data^[12] + $e6db99e5, 11);
C := D + LRot32 (C + (D xor A xor B) + data^[15] + $1fa27cf8, 16);
B := C + LRot32 (B + (C xor D xor A) + data^[ 2] + $c4ac5665, 23);

A := B + LRot32 (A + (C xor (B or (not D))) + data^[ 0] + $f4292244, 6);
D := A + LRot32 (D + (B xor (A or (not C))) + data^[ 7] + $432aff97, 10);
C := D + LRot32 (C + (A xor (D or (not B))) + data^[14] + $ab9423a7, 15);
B := C + LRot32 (B + (D xor (C or (not A))) + data^[ 5] + $fc93a039, 21);
A := B + LRot32 (A + (C xor (B or (not D))) + data^[12] + $655b59c3, 6);
D := A + LRot32 (D + (B xor (A or (not C))) + data^[ 3] + $8f0ccc92, 10);
C := D + LRot32 (C + (A xor (D or (not B))) + data^[10] + $ffeff47d, 15);
B := C + LRot32 (B + (D xor (C or (not A))) + data^[ 1] + $85845dd1, 21);
A := B + LRot32 (A + (C xor (B or (not D))) + data^[ 8] + $6fa87e4f, 6);
D := A + LRot32 (D + (B xor (A or (not C))) + data^[15] + $fe2ce6e0, 10);
C := D + LRot32 (C + (A xor (D or (not B))) + data^[ 6] + $a3014314, 15);
B := C + LRot32 (B + (D xor (C or (not A))) + data^[13] + $4e0811a1, 21);
A := B + LRot32 (A + (C xor (B or (not D))) + data^[ 4] + $f7537e82, 6);
D := A + LRot32 (D + (B xor (A or (not C))) + data^[11] + $bd3af235, 10);
C := D + LRot32 (C + (A xor (D or (not B))) + data^[ 2] + $2ad7d2bb, 15);
B := C + LRot32 (B + (D xor (C or (not A))) + data^[ 9] + $eb86d391, 21);

Inc (CurrentHash[0], A);
Inc (CurrentHash[1], B);
Inc (CurrentHash[2], C);
Inc (CurrentHash[3], D);

Result := StrLower(PChar(HEX[P[0]]));

for i := 1 to 7 do

Result := Concat (Result, StrLower(PChar(HEX[P[i]])));

end;

var DEC, Tmp: Integer;
LH: string;

initialization

for DEC := 0 to $ffff do
begin
Tmp := DEC and $ff;
LH := IntToHex (Tmp, 2);
Tmp := DEC shr 8;
HEX[DEC] := Concat (LH, IntToHex (Tmp, 2));
end;

end.