wndes.pas

采用加密算法进行管理用户密码采用加密算法进行管理用户密码

unit WNDES;
//**************************************************************************
//*Des加密算法
//*
//*
//*
//*
//*
//*
//*杨海生:从网上得到此文件
//*Email:[e-mail]
//*QQ:955743
//**************************************************************************
interface
uses
 Windows, Messages, ShlObj, WinSock, IniFiles, ActiveX, SysUtils,
 Classes, Graphics, Controls, Forms, Dialogs;

type
 TKeyByte = array[0..5] of Byte;
 TDesMode = (dmEncry, dmDESry);
const
 BitIP: array[0..63] of Byte =
 (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 =
 (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 =
 (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 =
 (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 =
 ((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 =
 (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 =
 (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);
//////////////////DES加密算法////////////////////////////    
function EncryStr(Str, Key: string): string; //加密
function EncryStrHex(Str, Key: string): string; //以十六进制加密(有些时侯加密的密文含有特殊字符文本框不能显示、数据库文本字段也不能存储。以十六进制形式表示可保证绝对不会出现该种情况)
function DESryStr(Str, Key: string): string; //解密
function DESryStrHex(StrHex, Key: string): string; //解密十六进制加密的密文

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

implementation



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
   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];
                                               // outBuf       xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
 buf[0] := outBuf[0] shr 2; //xxxxxx -> 2
 buf[1] := ((outBuf[0] and $03) shl 4) or (outBuf[1] shr 4); // 4 <- xx xxxx -> 4
 buf[2] := ((outBuf[1] and $0F) shl 2) or (outBuf[2] shr 6); //        2 <- xxxx xx -> 6
 buf[3] := outBuf[2] and $3F; //                    xxxxxx
 buf[4] := outBuf[3] shr 2; //                           xxxxxx
 buf[5] := ((outBuf[3] and $03) shl 4) or (outBuf[4] shr 4); //                                 xx xxxx
 buf[6] := ((outBuf[4] and $0F) shl 2) or (outBuf[5] shr 6); //                                        xxxx xx
 buf[7] := outBuf[5] and $3F; //                                               xxxxxx
 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 = dmDESry 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;
//key的长度超过8个字节后，超过部分无效
//加密串少于等于8个字节则返回8个字节，超过8个字节少于等于16个字节返回16个字节
//以次类推。
function EncryStr(Str, Key: string): string;
var
 StrByte, OutByte, KeyByte: array[0..7] of Byte;
 StrResult: string;
 I, J: Integer;
begin
 if (Length(Str) > 0) and (Ord(Str[Length(Str)]) = 0) then
   raise Exception.Create('Error: the last char is NULL char.');
 if Length(Key) < 8 then
   while Length(Key) < 8 do Key := Key + Chr(0);
 while Length(Str) mod 8 <> 0 do Str := Str + Chr(0);

 for J := 0 to 7 do KeyByte[J] := Ord(Key[J + 1]);
 makeKey(keyByte, subKey);

 StrResult := '';

 for I := 0 to Length(Str) div 8 - 1 do
 begin
   for J := 0 to 7 do
     StrByte[J] := Ord(Str[I * 8 + J + 1]);
   desData(dmEncry, StrByte, OutByte);
   for J := 0 to 7 do
     StrResult := StrResult + Chr(OutByte[J]);
 end;

 Result := StrResult;
end;

function DESryStr(Str, Key: string): string;
var
 StrByte, OutByte, KeyByte: array[0..7] of Byte;
 StrResult: string;
 I, J: Integer;
begin
 if Length(Key) < 8 then
   while Length(Key) < 8 do Key := Key + Chr(0);

 for J := 0 to 7 do KeyByte[J] := Ord(Key[J + 1]);
 makeKey(keyByte, subKey);

 StrResult := '';

 for I := 0 to Length(Str) div 8 - 1 do
 begin
   for J := 0 to 7 do StrByte[J] := Ord(Str[I * 8 + J + 1]);
   desData(dmDESry, StrByte, OutByte);
   for J := 0 to 7 do
     StrResult := StrResult + Chr(OutByte[J]);
 end;
 while (Length(StrResult) > 0) and
   (Ord(StrResult[Length(StrResult)]) = 0) do
   Delete(StrResult, Length(StrResult), 1);
 Result := StrResult;
end;

///////////////////////////////////////////////////////////
//key的长度超过8个字节后，超过部分无效
//加密串少于等于8个字节则返回16个字节，超过8个字节少于等于16个字节返回32个字节
//以次类推。
function EncryStrHex(Str, Key: string): string;
var
 StrResult, TempResult, Temp: string;
 I: Integer;
begin
 TempResult := EncryStr(Str, Key);
 StrResult := '';
 for I := 0 to Length(TempResult) - 1 do
 begin
   Temp := Format('%x', [Ord(TempResult[I + 1])]);
   if Length(Temp) = 1 then Temp := '0' + Temp;
   StrResult := StrResult + Temp;
 end;
 Result := StrResult;
end;

function DESryStrHex(StrHex, Key: string): string;
 function HexToInt(Hex: string): Integer;
 var
   I, Res: Integer;
   ch: Char;
 begin
   Res := 0;
   for I := 0 to Length(Hex) - 1 do
   begin
     ch := Hex[I + 1];
     if (ch >= '0') and (ch <= '9') then
       Res := Res * 16 + Ord(ch) - Ord('0')
     else if (ch >= 'A') and (ch <= 'F') then
       Res := Res * 16 + Ord(ch) - Ord('A') + 10
     else if (ch >= 'a') and (ch <= 'f') then
       Res := Res * 16 + Ord(ch) - Ord('a') + 10
     else raise Exception.Create('Error: not a Hex String');
   end;
   Result := Res;
 end;

var
 Str, Temp: string;
 I: Integer;
begin
 Str := '';
 for I := 0 to Length(StrHex) div 2 - 1 do
 begin
   Temp := Copy(StrHex, I * 2 + 1, 2);
   Str := Str + Chr(HexToInt(Temp));
 end;
 Result := DESryStr(Str, Key);
end;


end.