Mega Code Archive
Md5 şifreleme
<![CDATA[
unit Md5;
{$Q-}
{$R-}
interface
uses
Windows,
SysUtils,
Classes;
type
TMd5Digest = array[0..3] of LongWord;
TMd5Stream = class(TStream)
private
BlockCount: Int64;
BufCount: Cardinal;
Buffer: array[0..15] of LongWord;
A: LongWord;
B: LongWord;
C: LongWord;
D: LongWord;
function F(X, Y, Z: LongWord): LongWord;
function G(X, Y, Z: LongWord): LongWord;
function H(X, Y, Z: LongWord): LongWord;
function I(X, Y, Z: LongWord): LongWord;
function Rotate(L: LongWord; NumBits: Cardinal): LongWord;
protected
procedure AddByte(B: Byte); virtual;
function GetDigest: TMd5Digest; virtual;
function GetDigestString: String; virtual;
procedure Initialize; virtual;
procedure UpdateDigest; virtual;
public
constructor Create;
function Read(var Buffer; Count: Longint): Longint; override;
function Seek(Offset: Longint; Origin: Word): Longint; override;
function Write(const Buffer; Count: Longint): Longint; override;
property Digest: TMd5Digest read GetDigest;
property DigestString: String read GetDigestString; end;
implementation
const
T: array[1..64] of LongWord = ($D76AA478, $E8C7B756, $242070DB,
$C1BDCEEE, $F57C0FAF, $4787C62A, $A8304613, $FD469501, $698098D8,
$8B44F7AF, $FFFF5BB1, $895CD7BE, $6B901122, $FD987193, $A679438E,
$49B40821, $F61E2562, $C040B340, $265E5A51, $E9B6C7AA, $D62F105D,
$02441453, $D8A1E681, $E7D3FBC8, $21E1CDE6, $C33707D6, $F4D50D87,
$455A14ED, $A9E3E905, $FCEFA3F8, $676F02D9, $8D2A4C8A, $FFFA3942,
$8771F681, $6D9D6122, $FDE5380C, $A4BEEA44, $4BDECFA9, $F6BB4B60,
$BEBFBC70, $289B7EC6, $EAA127FA, $D4EF3085, $04881D05, $D9D4D039,
$E6DB99E5, $1FA27CF8, $C4AC5665, $F4292244, $432AFF97, $AB9423A7,
$FC93A039, $655B59C3, $8F0CCC92, $FFEFF47D, $85845DD1, $6FA87E4F,
$FE2CE6E0, $A3014314, $4E0811A1, $F7537E82, $BD3AF235, $2AD7D2BB,
$EB86D391);
constructor TMd5Stream.Create;
begin
inherited Create;
Initialize end;
procedure TMd5Stream.AddByte(B: Byte);
begin
case BufCount mod 4 of
0:
Buffer[BufCount div 4] := Buffer[BufCount div 4] or B;
1:
Buffer[BufCount div 4] := Buffer[BufCount div 4] or (B shl 8);
2:
Buffer[BufCount div 4] := Buffer[BufCount div 4] or (B shl 16);
3:
Buffer[BufCount div 4] := Buffer[BufCount div 4] or (B shl 24)
end;
Inc(BufCount);
if BufCount = 64 then
UpdateDigest end;
function TMd5Stream.F(X, Y, Z: LongWord): LongWord;
begin
Result := (X and Y) or ((not X) and Z) end;
function TMd5Stream.G(X, Y, Z: LongWord): LongWord;
begin
Result := (X and Z) or (Y and (not Z)) end;
function TMd5Stream.H(X, Y, Z: LongWord): LongWord;
begin
Result := X xor Y xor Z end;
function TMd5Stream.I(X, Y, Z: LongWord): LongWord;
begin
Result := Y xor (X or (not Z)) end;
function TMd5Stream.GetDigest: TMd5Digest;
var
L: Int64;
MsgLen: Int64;
begin
MsgLen := BlockCount * 512 + BufCount * 8;
AddByte($80);
L := 0;
if BufCount > 56 then
Write(L, SizeOf(L));
while BufCount < 56 do
AddByte(0);
Write(MsgLen, SizeOf(MsgLen));
Result[0] := A;
Result[1] := B;
Result[2] := C;
Result[3] := D;
Initialize end;
function TMd5Stream.GetDigestString: String;
var
D: TMd5Digest;
begin
D := GetDigest;
SetLength(Result, SizeOf(D));
Move(D, Result[1], Length(Result)) end;
procedure TMd5Stream.Initialize;
begin
BlockCount := 0;
BufCount := 0;
FillChar(Buffer, SizeOf(Buffer), 0);
A := $67452301;
B := $EFCDAB89;
C := $98BADCFE;
D := $10325476 end;
function TMd5Stream.Read(var Buffer; Count: LongInt): LongInt;
begin
Result := 0 end;
function TMd5Stream.Rotate(L: LongWord; NumBits: Cardinal): LongWord;
begin
Result := (L shl NumBits) + (L shr (32 - NumBits)) end;
function TMd5Stream.Seek(Offset: LongInt; Origin: Word): LongInt;
begin
Result := BlockCount * 16 + BufCount end;
procedure TMd5Stream.UpdateDigest;
var
AA: LongWord;
BB: LongWord;
CC: LongWord;
DD: LongWord;
begin
Inc(BlockCount);
AA := A;
BB := B;
CC := C;
DD := D;
A := B + Rotate(A + F(B, C, D) + Buffer[ 0] + T[ 1], 7);
D := A + Rotate(D + F(A, B, C) + Buffer[ 1] + T[ 2], 12);
C := D + Rotate(C + F(D, A, B) + Buffer[ 2] + T[ 3], 17);
B := C + Rotate(B + F(C, D, A) + Buffer[ 3] + T[ 4], 22);
A := B + Rotate(A + F(B, C, D) + Buffer[ 4] + T[ 5], 7);
D := A + Rotate(D + F(A, B, C) + Buffer[ 5] + T[ 6], 12);
C := D + Rotate(C + F(D, A, B) + Buffer[ 6] + T[ 7], 17);
B := C + Rotate(B + F(C, D, A) + Buffer[ 7] + T[ 8], 22);
A := B + Rotate(A + F(B, C, D) + Buffer[ 8] + T[ 9], 7);
D := A + Rotate(D + F(A, B, C) + Buffer[ 9] + T[10], 12);
C := D + Rotate(C + F(D, A, B) + Buffer[10] + T[11], 17);
B := C + Rotate(B + F(C, D, A) + Buffer[11] + T[12], 22);
A := B + Rotate(A + F(B, C, D) + Buffer[12] + T[13], 7);
D := A + Rotate(D + F(A, B, C) + Buffer[13] + T[14], 12);
C := D + Rotate(C + F(D, A, B) + Buffer[14] + T[15], 17);
B := C + Rotate(B + F(C, D, A) + Buffer[15] + T[16], 22);
A := B + Rotate(A + G(B, C, D) + Buffer[ 1] + T[17], 5);
D := A + Rotate(D + G(A, B, C) + Buffer[ 6] + T[18], 9);
C := D + Rotate(C + G(D, A, B) + Buffer[11] + T[19], 14);
B := C + Rotate(B + G(C, D, A) + Buffer[ 0] + T[20], 20);
A := B + Rotate(A + G(B, C, D) + Buffer[ 5] + T[21], 5);
D := A + Rotate(D + G(A, B, C) + Buffer[10] + T[22], 9);
C := D + Rotate(C + G(D, A, B) + Buffer[15] + T[23], 14);
B := C + Rotate(B + G(C, D, A) + Buffer[ 4] + T[24], 20);
A := B + Rotate(A + G(B, C, D) + Buffer[ 9] + T[25], 5);
D := A + Rotate(D + G(A, B, C) + Buffer[14] + T[26], 9);
C := D + Rotate(C + G(D, A, B) + Buffer[ 3] + T[27], 14);
B := C + Rotate(B + G(C, D, A) + Buffer[ 8] + T[28], 20);
A := B + Rotate(A + G(B, C, D) + Buffer[13] + T[29], 5);
D := A + Rotate(D + G(A, B, C) + Buffer[ 2] + T[30], 9);
C := D + Rotate(C + G(D, A, B) + Buffer[ 7] + T[31], 14);
B := C + Rotate(B + G(C, D, A) + Buffer[12] + T[32], 20);
A := B + Rotate(A + H(B, C, D) + Buffer[ 5] + T[33], 4);
D := A + Rotate(D + H(A, B, C) + Buffer[ 8] + T[34], 11);
C := D + Rotate(C + H(D, A, B) + Buffer[11] + T[35], 16);
B := C + Rotate(B + H(C, D, A) + Buffer[14] + T[36], 23);
A := B + Rotate(A + H(B, C, D) + Buffer[ 1] + T[37], 4);
D := A + Rotate(D + H(A, B, C) + Buffer[ 4] + T[38], 11);
C := D + Rotate(C + H(D, A, B) + Buffer[ 7] + T[39], 16);
B := C + Rotate(B + H(C, D, A) + Buffer[10] + T[40], 23);
A := B + Rotate(A + H(B, C, D) + Buffer[13] + T[41], 4);
D := A + Rotate(D + H(A, B, C) + Buffer[ 0] + T[42], 11);
C := D + Rotate(C + H(D, A, B) + Buffer[ 3] + T[43], 16);
B := C + Rotate(B + H(C, D, A) + Buffer[ 6] + T[44], 23);
A := B + Rotate(A + H(B, C, D) + Buffer[ 9] + T[45], 4);
D := A + Rotate(D + H(A, B, C) + Buffer[12] + T[46], 11);
C := D + Rotate(C + H(D, A, B) + Buffer[15] + T[47], 16);
B := C + Rotate(B + H(C, D, A) + Buffer[ 2] + T[48], 23);
A := B + Rotate(A + I(B, C, D) + Buffer[ 0] + T[49], 6);
D := A + Rotate(D + I(A, B, C) + Buffer[ 7] + T[50], 10);
C := D + Rotate(C + I(D, A, B) + Buffer[14] + T[51], 15);
B := C + Rotate(B + I(C, D, A) + Buffer[ 5] + T[52], 21);
A := B + Rotate(A + I(B, C, D) + Buffer[12] + T[53], 6);
D := A + Rotate(D + I(A, B, C) + Buffer[ 3] + T[54], 10);
C := D + Rotate(C + I(D, A, B) + Buffer[10] + T[55], 15);
B := C + Rotate(B + I(C, D, A) + Buffer[ 1] + T[56], 21);
A := B + Rotate(A + I(B, C, D) + Buffer[ 8] + T[57], 6);
D := A + Rotate(D + I(A, B, C) + Buffer[15] + T[58], 10);
C := D + Rotate(C + I(D, A, B) + Buffer[ 6] + T[59], 15);
B := C + Rotate(B + I(C, D, A) + Buffer[13] + T[60], 21);
A := B + Rotate(A + I(B, C, D) + Buffer[ 4] + T[61], 6);
D := A + Rotate(D + I(A, B, C) + Buffer[11] + T[62], 10);
C := D + Rotate(C + I(D, A, B) + Buffer[ 2] + T[63], 15);
B := C + Rotate(B + I(C, D, A) + Buffer[ 9] + T[64], 21);
A := A + AA;
B := B + BB;
C := C + CC;
D := D + DD;
BufCount := 0;
FillChar(Buffer, SizeOf(Buffer), 0) end;
function TMd5Stream.Write(const Buffer; Count: LongInt): LongInt;
var
I: Cardinal;
P: PByteArray;
begin
P := @Buffer;
for I := 0 to Count - 1 do
AddByte(P^[I]);
Result := Count end;
end.
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