加密解密程序

下面的程序已經在Bcb5下通過

#include
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
AnsiString PassWord(AnsiString cz0003_6,int cz0003_a)
{
// 字符串加解密處理函數
// 參數說明：cz0003_6 --- 待處理字符串
// cz0003_a --- 處理方式(1.加密;-1.解密)
AnsiString cz0003_0,cz0003_1,cz0003_2,cz0003_3,cz0003_4,cz0003_8;
int cz0003_7,cz0003_5,cz0003_9;
AnsiString s1,s2;

cz0003_0="西藏大昌實業集團";
cz0003_1="大昌網絡有限公司";
cz0003_2="旅遊產品分銷系統";
cz0003_3="版本 Ver 1.0";
cz0003_4=cz0003_0+cz0003_1; // 加密字符串
cz0003_5=cz0003_4.Length(); // 加密字符串長度
cz0003_8=""; // 加密後的字符串
cz0003_9=0;
if(cz0003_a==-1)
{
for(cz0003_7=1;cz0003_7<=cz0003_6.Length();cz0003_7++)
{
//s1:=copy(cz0003_6,cz0003_7,1);
s1 = cz0003_6.SubString(cz0003_7,1);
//s2:=copy(cz0003_4,(cz0003_7-1) mod cz0003_5+1,1);
s2 = cz0003_4.SubString((cz0003_7-1) % cz0003_5+1,1);
cz0003_9=int(s1[1])-int(s2[1]);
if(cz0003_9<0)
cz0003_8=cz0003_8+String(char(cz0003_9+256));
else
cz0003_8=cz0003_8+String(char(cz0003_9));
}
}else{ // 加運算
for(cz0003_7=1;cz0003_7<=cz0003_6.Length();cz0003_7++)
{
s1=cz0003_6.SubString(cz0003_7,1);
s2=cz0003_4.SubString((cz0003_7-1) % cz0003_5+1,1);
cz0003_9=int(s1[1])+int(s2[1]);
if(cz0003_9>255)
cz0003_8=cz0003_8+String(char(cz0003_9-256));
else
cz0003_8=cz0003_8+String(char(cz0003_9));
}
}
cz0003_6=cz0003_8;
return cz0003_8;
}

//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
Label1->Caption=PassWord("I love you",1);

}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
Label1->Caption=PassWord(Label1->Caption,-1);
}
//-----------------------------------------------------------------