unit1.pas

来自「供asp使用的md5算法组件。示范如何在delphi中制作asp组件。」· PAS 代码 · 共 1,575 行 · 第 1/4 页

implementation

uses ComServ;

procedure Tmake.OnEndPage;
begin
  inherited OnEndPage;
end;

procedure Tmake.OnStartPage(const AScriptingContext: IUnknown);
begin
  inherited OnStartPage(AScriptingContext);
end;

procedure initPermutation(var inData: array of Byte);
var
  newData: array[0..7] of Byte;
  i: Integer;
begin
  FillChar(newData, 8, 0);
  for i := 0 to 63 do
    if (inData[BitIP[i] shr 3] and (1 shl (7- (BitIP[i] and $07)))) <> 0 then
      newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
  for i := 0 to 7 do inData[i] := newData[i];
end;

procedure conversePermutation(var inData: array of Byte);
var
  newData: array[0..7] of Byte;
  i: Integer;
begin
  FillChar(newData, 8, 0);
  for i := 0 to 63 do
    if (inData[BitCP[i] shr 3] and (1 shl (7-(BitCP[i] and $07)))) <> 0 then
      newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
  for i := 0 to 7 do inData[i] := newData[i];
end;

procedure expand(inData: array of Byte; var outData: array of Byte);
var
  i: Integer;
begin
  FillChar(outData, 6, 0);
  for i := 0 to 47 do
    if (inData[BitExp[i] shr 3] and (1 shl (7-(BitExp[i] and $07)))) <> 0 then
      outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
end;

procedure permutation(var inData: array of Byte);
var
  newData: array[0..3] of Byte;
  i: Integer;
begin
  FillChar(newData, 4, 0);
  for i := 0 to 31 do
    if (inData[BitPM[i] shr 3] and (1 shl (7-(BitPM[i] and $07)))) <> 0 then
      newData[i shr 3] := newData[i shr 3] or (1 shl (7-(i and $07)));
  for i := 0 to 3 do inData[i] := newData[i];
end;

function si(s,inByte: Byte): Byte;
var
  c: Byte;
begin
  c := (inByte and $20) or ((inByte and $1e) shr 1) or
    ((inByte and $01) shl 4);
  Result := (ssBox[s][c] and $0f);
end;

procedure permutationChoose1(inData: array of Byte;
  var outData: array of Byte);
var
  i: Integer;
begin
  FillChar(outData, 7, 0);
  for i := 0 to 55 do
    if (inData[BitPMC1[i] shr 3] and (1 shl (7-(BitPMC1[i] and $07)))) <> 0 then
      outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
end;

procedure permutationChoose2(inData: array of Byte;
  var outData: array of Byte);
var
  i: Integer;
begin
  FillChar(outData, 6, 0);
  for i := 0 to 47 do
    if (inData[BitPMC2[i] shr 3] and (1 shl (7-(BitPMC2[i] and $07)))) <> 0 then
      outData[i shr 3] := outData[i shr 3] or (1 shl (7-(i and $07)));
end;

procedure cycleMove(var inData: array of Byte; bitMove: Byte);
var
  i: Integer;
begin
  for i := 0 to bitMove - 1 do
  begin
    inData[0] := (inData[0] shl 1) or (inData[1] shr 7);
    inData[1] := (inData[1] shl 1) or (inData[2] shr 7);
    inData[2] := (inData[2] shl 1) or (inData[3] shr 7);
    inData[3] := (inData[3] shl 1) or ((inData[0] and $10) shr 4);
    inData[0] := (inData[0] and $0f);
  end;
end;

procedure makeKey(inKey: array of Byte; var outKey: array of TKeyByte);
const
  bitDisplace: array[0..15] of Byte =
    ( 1,1,2,2, 2,2,2,2, 1,2,2,2, 2,2,2,1 );
var
  outData56: array[0..6] of Byte;
  key28l: array[0..3] of Byte;
  key28r: array[0..3] of Byte;
  key56o: array[0..6] of Byte;
  i: Integer;
begin
  permutationChoose1(inKey, outData56);

  key28l[0] := outData56[0] shr 4;
  key28l[1] := (outData56[0] shl 4) or (outData56[1] shr 4);
  key28l[2] := (outData56[1] shl 4) or (outData56[2] shr 4);
  key28l[3] := (outData56[2] shl 4) or (outData56[3] shr 4);
  key28r[0] := outData56[3] and $0f;
  key28r[1] := outData56[4];
  key28r[2] := outData56[5];
  key28r[3] := outData56[6];

  for i := 0 to 15 do
  begin
    cycleMove(key28l, bitDisplace[i]);
    cycleMove(key28r, bitDisplace[i]);
    key56o[0] := (key28l[0] shl 4) or (key28l[1] shr 4);
    key56o[1] := (key28l[1] shl 4) or (key28l[2] shr 4);
    key56o[2] := (key28l[2] shl 4) or (key28l[3] shr 4);
    key56o[3] := (key28l[3] shl 4) or (key28r[0]);
    key56o[4] := key28r[1];
    key56o[5] := key28r[2];
    key56o[6] := key28r[3];
    permutationChoose2(key56o, outKey[i]);
  end;
end;

procedure encry(inData, subKey: array of Byte;
   var outData: array of Byte);
var
  outBuf: array[0..5] of Byte;
  buf: array[0..7] of Byte;
  i: Integer;
begin
  expand(inData, outBuf);
  for i := 0 to 5 do outBuf[i] := outBuf[i] xor subKey[i];
  buf[0] := outBuf[0] shr 2;
  buf[1] := ((outBuf[0] and $03) shl 4) or (outBuf[1] shr 4);
  buf[2] := ((outBuf[1] and $0f) shl 2) or (outBuf[2] shr 6);
  buf[3] := outBuf[2] and $3f;
  buf[4] := outBuf[3] shr 2;
  buf[5] := ((outBuf[3] and $03) shl 4) or (outBuf[4] shr 4);
  buf[6] := ((outBuf[4] and $0f) shl 2) or (outBuf[5] shr 6);
  buf[7] := outBuf[5] and $3f;                                
  for i := 0 to 7 do buf[i] := si(i, buf[i]);
  for i := 0 to 3 do outBuf[i] := (buf[i*2] shl 4) or buf[i*2+1];
  permutation(outBuf);
  for i := 0 to 3 do outData[i] := outBuf[i];
end;

procedure desData(desMode: TDesMode;
  inData: array of Byte; var outData: array of Byte);
// inData, outData 都为8Bytes，否则出错
var
  i, j: Integer;
  temp, buf: array[0..3] of Byte;
begin
  for i := 0 to 7 do outData[i] := inData[i];
  initPermutation(outData);
  if desMode = dmEncry then
  begin
    for i := 0 to 15 do
    begin
      for j := 0 to 3 do temp[j] := outData[j];                 //temp = Ln
      for j := 0 to 3 do outData[j] := outData[j + 4];	        //Ln+1 = Rn
      encry(outData, subKey[i], buf);                           //Rn ==Kn==> buf
      for j := 0 to 3 do outData[j + 4] := temp[j] xor buf[j];  //Rn+1 = Ln^buf
    end;

    for j := 0 to 3 do temp[j] := outData[j + 4];
    for j := 0 to 3 do outData[j + 4] := outData[j];
    for j := 0 to 3 do outData[j] := temp[j];
  end
  else if desMode = dmDecry then
  begin
    for i := 15 downto 0 do
    begin
      for j := 0 to 3 do temp[j] := outData[j];
      for j := 0 to 3 do outData[j] := outData[j + 4];
      encry(outData, subKey[i], buf);
      for j := 0 to 3 do outData[j + 4] := temp[j] xor buf[j];
    end;
    for j := 0 to 3 do temp[j] := outData[j + 4];
    for j := 0 to 3 do outData[j + 4] := outData[j];
    for j := 0 to 3 do outData[j] := temp[j];
  end;
  conversePermutation(outData);
end;


function F(x, y, z: DWORD): DWORD;
begin
	Result := (x and y) or ((not x) and z);
end;

function G(x, y, z: DWORD): DWORD;
begin
	Result := (x and z) or (y and (not z));
end;

function H(x, y, z: DWORD): DWORD;
begin
	Result := x xor y xor z;
end;

function I(x, y, z: DWORD): DWORD;
begin
	Result := y xor (x or (not z));
end;

procedure rot(var x: DWORD; n: BYTE);
begin
	x := (x shl n) or (x shr (32 - n));
end;

procedure FF(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
	inc(a, F(b, c, d) + x + ac);
	rot(a, s);
	inc(a, b);
end;

procedure GG(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
	inc(a, G(b, c, d) + x + ac);
	rot(a, s);
	inc(a, b);
end;

procedure HH(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
	inc(a, H(b, c, d) + x + ac);
	rot(a, s);
	inc(a, b);
end;

procedure II(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
	inc(a, I(b, c, d) + x + ac);
	rot(a, s);
	inc(a, b);
end;

procedure Encode(Source, Target: pointer; Count: longword);
var
	S: PByte;
	T: PDWORD;
	I: longword;
begin
	S := Source;
	T := Target;
	for I := 1 to Count div 4 do begin
		T^ := S^;
		inc(S);
		T^ := T^ or (S^ shl 8);
		inc(S);
		T^ := T^ or (S^ shl 16);
		inc(S);
		T^ := T^ or (S^ shl 24);
		inc(S);
		inc(T);
	end;
end;

procedure Decode(Source, Target: pointer; Count: longword);
var
	S: PDWORD;
	T: PByte;
	I: longword;
begin
	S := Source;
	T := Target;
	for I := 1 to Count do begin
		T^ := S^ and $ff;
		inc(T);
		T^ := (S^ shr 8) and $ff;
		inc(T);
		T^ := (S^ shr 16) and $ff;
		inc(T);
		T^ := (S^ shr 24) and $ff;
		inc(T);
		inc(S);
	end;
end;

procedure Transform(Buffer: pointer; var State: MD5State);
var
	a, b, c, d: DWORD;
	Block: MD5Block;
begin
	Encode(Buffer, @Block, 64);
	a := State[0];
	b := State[1];
	c := State[2];
	d := State[3];
	FF (a, b, c, d, Block[ 0],  7, $d76aa478);
	FF (d, a, b, c, Block[ 1], 12, $e8c7b756);
	FF (c, d, a, b, Block[ 2], 17, $242070db);
	FF (b, c, d, a, Block[ 3], 22, $c1bdceee);
	FF (a, b, c, d, Block[ 4],  7, $f57c0faf);
	FF (d, a, b, c, Block[ 5], 12, $4787c62a);
	FF (c, d, a, b, Block[ 6], 17, $a8304613);
	FF (b, c, d, a, Block[ 7], 22, $fd469501);
	FF (a, b, c, d, Block[ 8],  7, $698098d8);
	FF (d, a, b, c, Block[ 9], 12, $8b44f7af);
	FF (c, d, a, b, Block[10], 17, $ffff5bb1);
	FF (b, c, d, a, Block[11], 22, $895cd7be);
	FF (a, b, c, d, Block[12],  7, $6b901122);
	FF (d, a, b, c, Block[13], 12, $fd987193);
	FF (c, d, a, b, Block[14], 17, $a679438e);
	FF (b, c, d, a, Block[15], 22, $49b40821);
	GG (a, b, c, d, Block[ 1],  5, $f61e2562);
	GG (d, a, b, c, Block[ 6],  9, $c040b340);
	GG (c, d, a, b, Block[11], 14, $265e5a51);
	GG (b, c, d, a, Block[ 0], 20, $e9b6c7aa);
	GG (a, b, c, d, Block[ 5],  5, $d62f105d);
	GG (d, a, b, c, Block[10],  9,  $2441453);
	GG (c, d, a, b, Block[15], 14, $d8a1e681);
	GG (b, c, d, a, Block[ 4], 20, $e7d3fbc8);
	GG (a, b, c, d, Block[ 9],  5, $21e1cde6);
	GG (d, a, b, c, Block[14],  9, $c33707d6);
	GG (c, d, a, b, Block[ 3], 14, $f4d50d87);
	GG (b, c, d, a, Block[ 8], 20, $455a14ed);
	GG (a, b, c, d, Block[13],  5, $a9e3e905);
	GG (d, a, b, c, Block[ 2],  9, $fcefa3f8);
	GG (c, d, a, b, Block[ 7], 14, $676f02d9);
	GG (b, c, d, a, Block[12], 20, $8d2a4c8a);
	HH (a, b, c, d, Block[ 5],  4, $fffa3942);
	HH (d, a, b, c, Block[ 8], 11, $8771f681);
	HH (c, d, a, b, Block[11], 16, $6d9d6122);
	HH (b, c, d, a, Block[14], 23, $fde5380c);
	HH (a, b, c, d, Block[ 1],  4, $a4beea44);
	HH (d, a, b, c, Block[ 4], 11, $4bdecfa9);
	HH (c, d, a, b, Block[ 7], 16, $f6bb4b60);
	HH (b, c, d, a, Block[10], 23, $bebfbc70);
	HH (a, b, c, d, Block[13],  4, $289b7ec6);
	HH (d, a, b, c, Block[ 0], 11, $eaa127fa);
	HH (c, d, a, b, Block[ 3], 16, $d4ef3085);
	HH (b, c, d, a, Block[ 6], 23,  $4881d05);
	HH (a, b, c, d, Block[ 9],  4, $d9d4d039);
	HH (d, a, b, c, Block[12], 11, $e6db99e5);
	HH (c, d, a, b, Block[15], 16, $1fa27cf8);
	HH (b, c, d, a, Block[ 2], 23, $c4ac5665);
	II (a, b, c, d, Block[ 0],  6, $f4292244);
	II (d, a, b, c, Block[ 7], 10, $432aff97);
	II (c, d, a, b, Block[14], 15, $ab9423a7);
	II (b, c, d, a, Block[ 5], 21, $fc93a039);
	II (a, b, c, d, Block[12],  6, $655b59c3);
	II (d, a, b, c, Block[ 3], 10, $8f0ccc92);
	II (c, d, a, b, Block[10], 15, $ffeff47d);
	II (b, c, d, a, Block[ 1], 21, $85845dd1);
	II (a, b, c, d, Block[ 8],  6, $6fa87e4f);
	II (d, a, b, c, Block[15], 10, $fe2ce6e0);
	II (c, d, a, b, Block[ 6], 15, $a3014314);
	II (b, c, d, a, Block[13], 21, $4e0811a1);
	II (a, b, c, d, Block[ 4],  6, $f7537e82);
	II (d, a, b, c, Block[11], 10, $bd3af235);
	II (c, d, a, b, Block[ 2], 15, $2ad7d2bb);
	II (b, c, d, a, Block[ 9], 21, $eb86d391);
	inc(State[0], a);
	inc(State[1], b);
	inc(State[2], c);
	inc(State[3], d);
end;

procedure MD5Init(var Context: MD5Context);
begin
	with Context do begin
		State[0] := $67452301;
		State[1] := $efcdab89;
		State[2] := $98badcfe;
		State[3] := $10325476;
		Count[0] := 0;
		Count[1] := 0;
		ZeroMemory(@Buffer, SizeOf(MD5Buffer));
	end;
end;