unit1.pas

delphi下的des加密解密算法源码及例子

///////////////////////////////////////////////////////////////////////////////
                         //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
//的自己需要进行变形。具体怎么操作可以登录我们的网站查询详细的资料。我们专门为软
//件开发者提供软件加密安全测试服务和软件加密解决方案，具体的可以参看我们的网站上
//的资料。我们的网站：http://www.ksaiy.com  http://www.magicoa.com
//技术支持:[e-mail] 在线QQ：40188696 UC：934155
                            //End //

                  //注意：转载请保留以上信息。//                            
///////////////////////////////////////////////////////////////////////////////
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    Label3: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

type
  TKeyByte = array[0..5] of Byte;
  TDesMode = (dmEncry, dmDecry);

  function EncryStr(Str, Key: String): String;
  function DecryStr(Str, Key: String): String;
  function EncryStrHex(Str, Key: String): String;
  function DecryStrHex(StrHex, Key: String): String;
  
const
  BitIP: array[0..63] of Byte =   //初始值置IP
    (57, 49, 41, 33, 25, 17,  9,  1,
     59, 51, 43, 35, 27, 19, 11,  3,
     61, 53, 45, 37, 29, 21, 13,  5,
     63, 55, 47, 39, 31, 23, 15,  7,
     56, 48, 40, 32, 24, 16,  8,  0,
     58, 50, 42, 34, 26, 18, 10,  2,
     60, 52, 44, 36, 28, 20, 12,  4,
     62, 54, 46, 38, 30, 22, 14,  6 );

  BitCP: array[0..63] of Byte = //逆初始置IP-1
    ( 39,  7, 47, 15, 55, 23, 63, 31,
      38,  6, 46, 14, 54, 22, 62, 30,
      37,  5, 45, 13, 53, 21, 61, 29,
      36,  4, 44, 12, 52, 20, 60, 28,
      35,  3, 43, 11, 51, 19, 59, 27,
      34,  2, 42, 10, 50, 18, 58, 26,
      33,  1, 41,  9, 49, 17, 57, 25,
      32,  0, 40,  8, 48, 16, 56, 24 );

  BitExp: array[0..47] of Integer = // 位选择函数E
    ( 31, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8, 9,10,
      11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,
      21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0  );

  BitPM: array[0..31] of Byte =  //置换函数P
    ( 15, 6,19,20,28,11,27,16, 0,14,22,25, 4,17,30, 9,
       1, 7,23,13,31,26, 2, 8,18,12,29, 5,21,10, 3,24 );

  sBox: array[0..7] of array[0..63] of Byte =    //S盒
    ( ( 14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7,
         0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8,
         4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0,
        15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13 ),

      ( 15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10,
         3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5,
         0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15,
        13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9 ),

      ( 10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8,
        13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1,
        13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7,
         1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12 ),

      (  7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15,
        13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9,
        10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4,
         3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14 ),

      (  2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9,
        14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6,
         4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14,
        11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3 ),

      ( 12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11,
        10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8,
         9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6,
         4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13 ),

      (  4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1,
        13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6,
         1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2,
         6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12 ),

      ( 13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7,
         1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2,
         7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8,
         2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11 ) );

  BitPMC1: array[0..55] of Byte = //选择置换PC-1
    ( 56, 48, 40, 32, 24, 16,  8,
       0, 57, 49, 41, 33, 25, 17,
       9,  1, 58, 50, 42, 34, 26,
      18, 10,  2, 59, 51, 43, 35,
      62, 54, 46, 38, 30, 22, 14,
       6, 61, 53, 45, 37, 29, 21,
      13,  5, 60, 52, 44, 36, 28,
      20, 12,  4, 27, 19, 11,  3 );

  BitPMC2: array[0..47] of Byte =//选择置换PC-2 
    ( 13, 16, 10, 23,  0,  4,
       2, 27, 14,  5, 20,  9,
      22, 18, 11,  3, 25,  7,
      15,  6, 26, 19, 12,  1,
      40, 51, 30, 36, 46, 54,
      29, 39, 50, 44, 32, 47,
      43, 48, 38, 55, 33, 52,
      45, 41, 49, 35, 28, 31 );

var
  Form1: TForm1;
  subKey: array[0..15] of TKeyByte;  

implementation

{$R *.dfm}

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 := (sBox[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