keyencryption.cpp

来自「VC环境下BlowFish算法加密解密原程序.This is a simple 」· C++ 代码 · 共 101 行

// KeyEncryption.cpp: implementation of the CChanger class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "KeyEncryption.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CKeyEncryption::CKeyEncryption()
{

}

CKeyEncryption::~CKeyEncryption()
{

}

string CKeyEncryption::Encrypt(string recVal, string recKey)
{
	int tmpVal1,tmpVal2,tmpVal3,mKeyLen,mCounter,KeyCount,DataLen;
	DataLen=recVal.length();
	string  tmp_recVal=recVal;
	char tChar;

    mKeyLen=recKey.length();
	DataLen=recVal.length()-1;
	KeyCount=0;
	for(mCounter=0; mCounter<=DataLen; mCounter++)
		{
			if(KeyCount==0)
			{		
				tmpVal1=recVal.at(mCounter);
				tmpVal2=recKey.at(KeyCount);
				tmpVal3=recKey.at(mKeyLen-1);
				tmpVal1=(tmpVal1+30)+(tmpVal3%10);
			}
			else
			{
				tmpVal1=recVal.at(mCounter);
				tmpVal2=recKey.at(KeyCount);
				tmpVal3=recKey.at(KeyCount-1);
				tmpVal1=(tmpVal1+30)+(tmpVal3%10);		
			}

			tChar=tmpVal1;
			tmp_recVal.at(mCounter)=tChar;
			KeyCount++;
			if(KeyCount==(mKeyLen-1)) KeyCount=0;
		}

    return tmp_recVal;
}


string CKeyEncryption::Decrypt(string recVal, string recKey)
{
	
	int tmpVal1,tmpVal2,tmpVal3,mKeyLen,mCounter,KeyCount,DataLen;
	DataLen=recVal.length();
	string  tmp_recVal=recVal;
	char tChar;

    mKeyLen=recKey.length();
	DataLen=recVal.length()-1;
	KeyCount=0;
	for(mCounter=0; mCounter<=DataLen; mCounter++)
		{
			if(KeyCount==0)
			{		
				tmpVal1=recVal.at(mCounter);
				tmpVal2=recKey.at(KeyCount);
				tmpVal3=recKey.at(mKeyLen-1);
				tmpVal1=(tmpVal1-30)-(tmpVal3%10);
			}
			else
			{
				tmpVal1=recVal.at(mCounter);
				tmpVal2=recKey.at(KeyCount);
				tmpVal3=recKey.at(KeyCount-1);
				tmpVal1=(tmpVal1-30)-(tmpVal3%10);		
			}

			tChar=tmpVal1;
			tmp_recVal.at(mCounter)=tChar;
			KeyCount++;
			if(KeyCount==(mKeyLen-1)) KeyCount=0;
		}
	
	
    return tmp_recVal;
}