IDEA数据加密算法实现

  IDEA数据加密算法介绍之续篇，代码实现：
http://blog.csdn.net/CXXSoft/archive/2006/08/23/1109279.aspx

5、   源码：

//*******************************************************************************
 *        IDEA数据加密算法1.0版本
 *        开发作者:    成晓旭
 *        项目简述:    IDEA数据加密算法1.0版本
 *        启动时间:    2000年05月08日  
 *        完成时间:    2000年01月14日  20:09:00    <1个晚上>
 *
 *        开发环境:    Windows98
 *        开发工具:    Borland Delphi5
 *
 *        文件名称:    IDEA.pas
 *        简    介:    IDEA数据加密算法1.0版本
 *
 *           备注:       任何人使用此文件时,请保留此段自述文件,谢谢!
 *
 ******************************************************************************/
unit IDEA;

interface

uses
  Windows, Messages, SysUtils, Classes,Dialogs;
  function BinToHex(strBin:string):string;
  function HexToTen(strHex:string):int64;
  function LeftMove(S:string;P:integer):String;
  function ModAdd(intAdd1,intAdd2:int64):int64;
  function ModMul(intMul1,intMul2:int64;intFlag:integer):int64;
  function ModXor(intXor1,intXor2:int64):int64;
  procedure CreatePassword(strPassword:string;VAR arrPassword:array of int64;VAR arrOpenPassword:array of int64);       //产生加密子密钥函数
  procedure GetOpenPassword(intSource:int64;VAR intResult:int64;Flag:integer);       //求取解密子密钥函数
  procedure CreateKeyTable();                         //产生加、解密子密钥之间的对应关系表
  procedure Riddle(arrPassword:array of int64;arrRiddleKey:array of int64;VAR arrOpenPassword:array of int64);StdCall;export;         //IDEA数据解密函数
  procedure CreateOpenPassword(VAR arrOpenPassKey:array of int64);                     //产生解密子密钥函数
  procedure CreateKey(VAR arrKey:array of int64;VAR arrOpenKey:array of int64;VAR strOutKey:string);StdCall;export;     //产生加密密钥函数


implementation

Const strNum:array[1..16] of string[4]=('0000','0001','0010','0011','0100','0101','0110','0111','1000','1001','1010','1011','1100','1101','1110','1111');
Const chrHex:array[1..16] of char=('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');
var
  g_arr_Ten_Password:array[1..52] of int64;
  g_arr_Flag:array[1..52] of integer;
  g_arr_Table:array[1..52] of integer;
...{--------------------------------------------------------------------}

procedure CreateKey(VAR arrKey:array of int64;VAR arrOpenKey:array of int64;VAR strOutKey:string);StdCall;export;
var
intKey,intLoop1,intLoop2,intLoop3:integer;
hexKey,ch,strTemp:string;
strKey:string[128];
begin
strKey:='';
Randomize;
for intLoop1:=1 to 8 do
 begin
   intKey:=Random(65536);
   hexKey:=IntToHex(intKey,4);
   strTemp:='';
   for intLoop2:=1 to 4 do
    begin
     ch:=Copy(hexKey,intLoop2,1);
     for intLoop3:=1 to 16 do
      begin
        if ch = chrHex[intLoop3] then
          begin
           ch:= strNum[intLoop3];
           break;
          end;
      end;
     strTemp:=strTemp+ch;
    end;
   strKey:=strKey+strTemp;
 end;
strOutKey:=strKey;                          
CreatePassword(strKey,arrKey,arrOpenKey);       //调用产生加密子密钥过程
end;
...{--------------------------------------------------------------------}

function BinToHex(strBin:string):string;
var
intLoop1,intLoop2:integer;
strTemp,strResult:string;
begin
intLoop1:=1;
strResult:='';
if Length(strBin) <> 16 then ShowMessage('二进制数据长度有错!');
while (intLoop1<=16) do
 begin
  strTemp:=Copy(strBin,intLoop1,4);
  for  intLoop2:=1 to 16 do
   if strTemp=strNum[intLoop2] then
    begin
      strTemp:=chrHex[intLoop2];
      break;
    end;
  strResult:=strResult+strTemp;
  intLoop1:=intLoop1 + 4;
 end;
BinToHex:=strResult;
end;
...{--------------------------------------------------------------------}

function HexToTen(strHex:string):int64;         //十六进制转十进制
var
intLoop1,intLoop2,intTemp:integer;
intResult:int64;
strTemp:string;
begin
intResult:=0;
intTemp:=0;
if Length(strHex) <> 4 then ShowMessage('十六进制数据长度有错!');
for intLoop1:=1 to 4 do
 begin
  Case intLoop1 of
   1:intTemp:=4096;
   2:intTemp:=256;
   3:intTemp:=16;
   4:intTemp:=1
  end;
  strTemp:=Copy(strHex,intLoop1,1);
  for intLoop2:=1 to 16 do
   if UpperCase(strTemp) = chrHex[intLoop2] then
    begin
     intResult:=intResult+(Int64(intLoop2) - 1)*Int64(intTemp);
     break;
    end;
 end;
HexToTen:=intResult;
end;
...{--------------------------------------------------------------------}

function LeftMove(S:string;P:integer):String;
var
int_Len,i:integer;
str_Result,str_Num:string;
begin
int_Len:=length(s);
str_Num:=S;
str_Result:='';
if int_Len <= P then
  str_Result :=S
else
begin
  for i:=P+1 to int_Len do
    str_Result:=str_Result+copy(str_Num,i,1);
  str_Result:=str_Result+copy(str_Num,1,p);
end;
LeftMove:=Trim(str_Result);
end;
...{--------------------------------------------------------------------}

function ModAdd(intAdd1,intAdd2:int64):int64;
begin
ModAdd:=(intAdd1 + intAdd2) mod 65536;   //模65536求和
end;

function ModMul(intMul1,intMul2:int64;intFlag:integer):int64;
var intTemp:int64;
begin
intTemp:=(intMul1 * intMul2) mod 65537; 
if intFlag = 0 then
 begin
  if intMul1 = 0     then    intTemp:=65537 - intMul2;
  if intMul2 = 0     then    intTemp:=65537 - intMul1;
  if intTemp = 65536 then    intTemp:=0;
  if intTemp = 65537 then    intTemp:=1;
 end
else
 begin
  if intMul1 = 0     then    intTemp:=65537 - intMul2;
  if intMul2 = 0     then    intTemp:=65537 - intMul1;
  if intTemp = 0     then    intTemp:=65536;
  if intTemp = 65537 then    intTemp:=1;
  if intTemp = 65536 then    intTemp:=0;                   
 end;
ModMul:=intTemp;
end;

function ModXor(intXor1,intXor2:int64):int64;
begin
ModXor:= intXor1 xor intXor2;
end;
...{--------------------------------------------------------------------}

procedure CreatePassword(strPassword:string;VAR arrPassword:array of int64;VAR arrOpenPassword:array of int64);
var
strKey:string;
strTemp:array[1..52] of string[4];
intStart,intCount:integer;
begin
strKey:=strPassword;                                                                                                                   //
intCount:=1;
intStart:=1;
...{--------------------产生52个16bit的加密子密钥部分-------------------}
while (intCount<=52) do
 begin
  strTemp[intCount]:=BinToHex(Copy(strKey,intStart,16));
  intStart:=intStart+16;
  intCount:=intCount+1;
  if ((intCount mod 8) = 1) then
   begin
    strKey:=LeftMove(strKey,25);
    intStart:=1;
   end;
 end;
intCount:=1;
while (intCount<=52) do
 begin
  arrPassword[intCount-1]:=HexToTen(strTemp[intCount]);
  g_arr_Ten_Password[intCount]:=arrPassword[intCount-1];
  intCount:=intCount+1;
 end;
CreateOpenPassword(arrOpenPassword);                       
...{--------------------产生52个16bit的加密子密钥部分-------------------}
end;
...{--------------------------------------------------------------------}

procedure GetOpenPassword(intSource:int64;VAR intResult:int64;Flag:integer);
var
int_Source,int_Result,int_Mod_Value:int64;
int_Loop:integer;
begin
int_Source:=intSource;
...{--------------------求取每个加密子密钥相应的解密子密钥部分-------------------}
Case Flag of
  0:    intResult:=int_Source;
  1:    intResult:=65536-int_Source;
  2:
    begin
      if int_Source=0 then
         intResult:=int_Source
      else
        for int_Loop:=1 to 65536 do
         begin
          int_Result:=Int64(int_Loop)*65537+1;
          int_Mod_Value:=int_Result mod int_Source;
          if int_Mod_Value = 0 then
            begin
              int_Result:=int_Result div int_Source;
              intResult:=int_Result;
              break;
            end;
         end;
    end;
end;
...{--------------------求取每个加密子密钥相应的解密子密钥部分-------------------}
end;
...{--------------------------------------------------------------------}

procedure CreateKeyTable();
var
int_Count_CreatePassword,int_Count_OpenPassword,int_ExChange:integer;
begin
...{----------------求取在产生解密子密钥时所用的参数标志对应表部分-------------}
for int_Count_CreatePassword:=52 downto 1 do
  Case int_Count_CreatePassword mod 6 of
    0,5:begin g_arr_Flag[int_Count_CreatePassword]:=0; end;
    2,3:begin g_arr_Flag[int_Count_CreatePassword]:=1; end;
    1,4:begin g_arr_Flag[int_Count_CreatePassword]:=2; end;
  end;
...{----------------求取在产生解密子密钥时所用的参数标志对应表部分-------------}

...{----------------求取每个加密子密钥与相应解密子密钥间的对应关系映射表部分-------------}
int_Count_CreatePassword:=52;
int_Count_OpenPassword:=1;
while (int_Count_CreatePassword>=1) do
begin
  Case int_Count_CreatePassword mod 6 of
    1,2,3,4:
    begin
      g_arr_Table[int_Count_OpenPassword]:=int_Count_CreatePassword-3;
      g_arr_Table[int_Count_OpenPassword+1]:=int_Count_CreatePassword-1;
      g_arr_Table[int_Count_OpenPassword+2]:=int_Count_CreatePassword-2;
      g_arr_Table[int_Count_OpenPassword+3]:=int_Count_CreatePassword;
      if (int_Count_CreatePassword >=48) or (int_Count_CreatePassword <=4 ) then  //首轮和末轮处理不需交换,故要再换回来
        begin
          int_ExChange:=g_arr_Table[int_Count_OpenPassword+1];
          g_arr_Table[int_Count_OpenPassword+1]:=g_arr_Table[int_Count_OpenPassword+2];
          g_arr_Table[int_Count_OpenPassword+2]:=int_ExChange;
        end;
      int_Count_CreatePassword:=int_Count_CreatePassword-4;
      int_Count_OpenPassword:=int_Count_OpenPassword+4;
    end;
    0,5:
    begin
      g_arr_Table[int_Count_OpenPassword]:=int_Count_CreatePassword-1;
      g_arr_Table[int_Count_OpenPassword+1]:=int_Count_CreatePassword;
      int_Count_CreatePassword:=int_Count_CreatePassword-2;
      int_Count_OpenPassword:=int_Count_OpenPassword+2;
    end;
  end;
end;
...{----------------求取每个加密子密钥与相应解密子密钥间的对应关系映射表部分-------------}
end;
...{--------------------------------------------------------------------}


procedure CreateOpenPassword(VAR arrOpenPassKey:array of int64);
var
int_Loop:integer;
arrTemp:array[1..52] of int64;
begin
...{-------------通过调用产生加、解密子密钥对应关系函数产生对应关系表部分------------------}
CreateKeyTable;
...{-------------通过调用求解解密子密钥函数产生解密子密钥部分------------------}
for int_Loop:=1 to 52 do
 begin
  GetOpenPassword(g_arr_Ten_Password[int_Loop],arrTemp[g_arr_Table[int_Loop]],g_arr_Flag[int_Loop]);
 end;
for int_Loop:=1 to 52 do
  arrOpenPassKey[int_Loop-1]:=arrTemp[int_Loop];
...{-------------通过调用求解解密子密钥函数产生解密子密钥部分------------------}
end;
...{--------------------------------------------------------------------}


procedure Riddle(arrPassword:array of int64;arrRiddleKey:array of int64;VAR arrOpenPassword:array of int64);
var
Count,i:integer;
V1,V2,V3,V4,V5,V6,V7,V8,V9,V10,V11,V12,V13,V14,C1,C2,C3,C4,ExChange:int64;
P:array[1..4] of int64;
begin
...{------------------------数据 "解密" 算法实现部分------------------}
for i:=Low(arrPassword) to High(arrPassword) do
 P[i+1]:=arrPassword[i];
Count:=0;
while (Count<48) do
begin
  V1:= ModMul(P[1],arrRiddleKey[Count],1);  //相乘    1
  Inc(Count);
  V2:= ModAdd(P[2],arrRiddleKey[Count]);  //相加    2
  Inc(Count);
  V3:= ModAdd(P[3],arrRiddleKey[Count]);  //相加    3
  Inc(Count);
  V4:= ModMul(P[4],arrRiddleKey[Count],1);  //相乘    4
  Inc(Count);
  V5:= ModXor(V1,V3);                                           //异或    5
  V6:= ModXor(V2,V4);                                           //异或    6
  V7:= ModMul(V5,arrRiddleKey[Count],1);    //相乘    7
  Inc(Count);
  V8:= ModAdd(V6,V7);                        //相加    8
  V9:= ModMul(V8,arrRiddleKey[Count],1);    //相乘    9
  Inc(Count);
  V10:=ModAdd(V7,V9);                      //相加    10
  V11:=ModXor(V1,V9);                      //异或    11
  V12:=ModXor(V2,V10);                     //异或    12
  V13:=ModXor(V3,V9);                      //异或    13
  V14:=ModXor(V4,V10);                     //异或    14
  P[1]:=V11;
  P[2]:=V13;                                //注意:交换中间两个输出结果
  P[3]:=V12;                                //注意:交换中间两个输出结果
  P[4]:=V14;
end;    //结束8轮计算
ExChange:=P[2];
P[2]:=P[3];
P[3]:=ExChange;                            //因为最后一轮无需转换,所以必须把P[2],P[3]再次转换回来
C1:= ModMul(P[1],arrRiddleKey[48],1);  //相乘    1
C2:= ModAdd(P[2],arrRiddleKey[49]);  //相加    2
C3:= ModAdd(P[3],arrRiddleKey[50]);  //相加    3
C4:= ModMul(P[4],arrRiddleKey[51],1);  //相乘    4
...{------------------------数据 "解密" 算法实现部分------------------}
arrOpenPassword[Low(arrOpenPassword)]:=C1;
arrOpenPassword[Low(arrOpenPassword)+1]:=C2;
arrOpenPassword[Low(arrOpenPassword)+2]:=C3;
arrOpenPassword[Low(arrOpenPassword)+3]:=C4;
//数据解密成功!
end;
...{--------------------------------------------------------------------}

end.

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