unit1.pas

BlowFish算法完整源码与调用方法 ,希望大家喜欢.

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var
  Form1: TForm1;
//实际加密使用的子密钥
  Key_Boxes: array[1..1042] of LongWord;

implementation

{$R *.dfm}

//BlowFish解密函数，入口、出口都是64位 
function BlowFish_DN(PT: int64): int64; 
var 
  i: byte; 
  xL, xR, tmp: LongWord; 
  r: int64; 
begin 
  xL := PT shr $20; 
  xR := PT mod $100000000; 
  xR := xR xor Key_Boxes[17]; 
  xL := xL xor Key_Boxes[18]; 
  for i:=16 downto 1 do 
  begin 
    if i<16 then 
    begin 
      tmp := xR; xR := xL; xL := tmp; 
    end;                        
    xR := BlowFish_Func(xL) xor xR; 
    xL := xL xor Key_Boxes[i]; 
  end; 
  r := xL; 
  r := (r shl $20) or xR; 
  Result := r; 
end; 

//BlowFish加密函数，参数同上 
function BlowFish_EN(PT: int64): int64; 
var 
  i: byte; 
  xL, xR, tmp: LongWord; 
  r: int64; 
begin 
  xL := PT shr $20; 
  xR := PT mod $100000000; 
  for i:=1 to 16 do 
  begin 
    xL := xL xor Key_Boxes[i]; 
    xR := BlowFish_Func(xL) xor xR; 
    if i<16 then 
    begin 
      tmp := xR; xR := xL; xL := tmp; 
    end; 
  end; 
  xR := xR xor Key_Boxes[17]; 
  xL := xL xor Key_Boxes[18]; 
  r := xL; 
  r := (r shl $20) or xR; 
  Result := r; 
end; 

//BlowFish中间的运算函数，入口、出口参数都是32位 
function BlowFish_Func(PT: LongWord): LongWord; 
var 
  a, b, c, d: byte; 
begin 
  a := (PT and $FF000000) shr $18; 
  b := (PT and $00FF0000) shr $10; 
  c := (PT and $0000FF00) shr $8; 
  d := (PT and $000000FF); 

  Result := (((Key_Boxes[a+19] + Key_Boxes[b+19+256]) mod 4294967296) xor Key_Boxes[c+19+512] + Key_Boxes[d+19+768]) mod 4294967296; 
end; 

//BlowFish的初始化，得到子密钥，放在Key_Boxes中 
procedure BlowFish_Init(Key: string);
var 
  i, j, k: integer; 
  tmp: LongWord; 
  PT: int64; 
begin 
  FillChar(Key_Boxes, SizeOf(Key_Boxes), 0); 

//变换填充P盒 
  j := 1; 
  for i:=1 to 18 do 
  begin 
    tmp := 0; 
    for k:=0 to 3 do 
    begin 
      tmp := (tmp shl 8) or Ord(Key[j]); 
      inc(j); 
      if j>Length(Key) then 
        j := 1; 
    end; 
    Key_Boxes[i] := pBox[i] xor tmp; 
  end; 

//填充S盒 
  for i:=0 to 3 do 
  for j:=0 to 255 do 
    Key_Boxes[i*256+j+19] := sBox[i+1, j+1]; 

//开始连续填充 
  PT := 0; 
  for i:=1 to 521 do 
  begin 
    PT := BlowFish_EN(PT); 
    Key_Boxes[i*2-1] := PT shr $20; 
    Key_Boxes[i*2] := PT mod $100000000; 
  end; 
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i,j:integer;
  b:Int64;
  S:String;
  Str:String;
begin
  b:=0;
  S:=Edit1.Text;
  for i:=1 to Length(Edit1.Text) do
    b:=b+ord(S[i])*10;
  BlowFish_Init('ksaiy');
  BlowFish_EN(B);
  if Edit2.Text =IntToHex(BlowFish_EN(b),0) then
    ShowMessage('注册成功！')
  else
    ShowMessage('注册失败！');
///////////////////////////////////////////////////////////////////////////////
                         //Des DEMO V1.0//
                          //作者：ksaiy//
//欢迎使用由ksaiy制作的DES加密算法演示程序，此算法为标准的DES算法，你可以根据的
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//的资料。我们的网站：http://www.ksaiy.com  http://www.magicoa.com
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                            //End //

                  //注意：转载请保留以上信息。//                            
///////////////////////////////////////////////////////////////////////////////
end;

end.