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unit md5_unit;
interface
uses Windows;
Type
TMD5 = Array [0..15] of byte;
function MD5(const s: AnsiString): AnsiString;
function MD5_arr(const s: AnsiString): TMD5;
implementation
//==============================================================================
const
HexDigitChr : array [0..15] of AnsiChar = ('0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F');
function Int2Hex(Value:dword;Digits:integer=0):AnsiString;
var
i:cardinal;
buf:array [0..31] of AnsiChar;
begin
if Digits<=0 then
begin
Digits:=0;
i:=Value;
repeat
i:=i shr 4;
inc(Digits);
until i=0;
end;
buf[Digits]:=#0;
repeat
Dec(Digits);
buf[Digits]:=AnsiChar(HexDigitChr[Value and $F]);
Value:=Value shr 4;
until Digits=0;
result:=buf;
end;
//==============================================================================
function MD5_arr(const s: AnsiString): TMD5;
var
a : TMD5;
LenHi, LenLo: longword;
Index: DWord;
HashBuffer : array[0..63] of byte;
CurrentHash : array[0..3] of DWord;
procedure Burn;
begin
LenHi:= 0; LenLo:= 0;
Index:= 0;
FillChar(HashBuffer,Sizeof(HashBuffer),0);
FillChar(CurrentHash,Sizeof(CurrentHash),0);
end;
procedure Init;
begin
Burn;
CurrentHash[0]:= $67452301;
CurrentHash[1]:= $efcdab89;
CurrentHash[2]:= $98badcfe;
CurrentHash[3]:= $10325476;
end;
function LRot32(a, b: longword): longword;
begin
Result:= (a shl b) or (a shr (32-b));
end;
procedure Compress;
var
Data : array[0..15] of dword;
A, B, C, D: dword;
begin
Move(HashBuffer,Data,Sizeof(Data));
A:= CurrentHash[0];
B:= CurrentHash[1];
C:= CurrentHash[2];
D:= CurrentHash[3];
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);
Index:= 0;
FillChar(HashBuffer,Sizeof(HashBuffer),0);
end;
procedure Update(const Buffer; Size: longword);
var
PBuf: ^byte;
begin
Inc(LenHi,Size shr 29);
Inc(LenLo,Size*8);
if LenLo < (Size*8) then Inc(LenHi);
PBuf:= @Buffer;
while Size> 0 do
begin
if (Sizeof(HashBuffer)-Index)<= DWord(Size) then
begin
Move(PBuf^,HashBuffer[Index],Sizeof(HashBuffer)-Index);
Dec(Size,Sizeof(HashBuffer)-Index);
Inc(PBuf,Sizeof(HashBuffer)-Index);
Compress;
end else
begin
Move(PBuf^,HashBuffer[Index],Size);
Inc(Index,Size);
Size:= 0;
end;
end;
end;
procedure Final(var Digest);
begin
HashBuffer[Index] := $80;
if Index >= 56 then Compress;
PDWord(@HashBuffer[56])^ := LenLo;
PDWord(@HashBuffer[60])^ := LenHi;
Compress;
Move(CurrentHash, Digest, Sizeof(CurrentHash));
Burn;
end;
begin
Init;
Update(s[1], Length(s));
Final(a);
result := a;
end;
//==============================================================================
function MD5(const s: AnsiString): AnsiString;
var
a : TMD5;
i : integer;
begin
a := MD5_arr(s);
result := '';
for i := 0 to 15 do result := result + Int2Hex(a[i], 2);
end;
end.
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