IDEA数据加密算法实现

王朝other·作者佚名 2007-09-15

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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;

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;

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;

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;

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;

...{--------------------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;

...{----------------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.