encryption.h

RSA算法伪代码

class CENCRYPTION
{
public:
CENCRYPTION();
virtual ~CENCRYPTION();
void Encrypt(UINT PublicKey, UINT mod, FILE* fipRe, FILE* fipWr,char* extrName );
void Explain(UINT PrivateKey, UINT mod, FILE* fipRe, FILE* fipWr );
void TxtEncrypt(unsigned* cipSourceTxt, int buffSize, unsigned int Ke, unsigned int model);
private:
//==================================求b的e次方除d的余数
unsigned int GetOutNum(unsigned int b,unsigned int e , unsigned int d);
//==================================对原文进行加密并覆盖原缓冲区
};
encryption.cpp//==本程序提供对文件进行加密解密的操作

CENCRYPTION::CENCRYPTION()
{ }
CENCRYPTION::~CENCRYPTION()
{ }
//==================================对原文进行加密并覆盖原缓冲区
void CENCRYPTION::TxtEncrypt(unsigned* cipSourceTxt, int buffSize, unsigned int Ke, unsigned int model)
{
int i;
for( i=0; i < buffSize; i++ )
{
   cipSourceTxt[i] = GetOutNum( cipSourceTxt[i], Ke, model );
}
}
//==================================求b的e次方除d的余数
unsigned int CENCRYPTION::GetOutNum(unsigned int b,unsigned int e , unsigned int d)
{
unsigned int i;
unsigned int outNum= 1;
for( i=0; i < e; i++)//=========用了乘的模 等于 模的乘
{
   outNum *= b;
   if( outNum >= d )
   {
    outNum %= d;
   }
   if(!outNum)
    return outNum;
}
return outNum%d;
}
void CENCRYPTION::Encrypt(UINT PublicKey, UINT mod, FILE* fipRe, FILE* fipWr ,char* extrName)
{
unsigned int ReSize;
unsigned int uBuf[BUFFER_SIZE]= {0,};
char cBuf[BUFFER_SIZE];
unsigned int i;
for(i=0; i<3; i++)//=====我认为扩展名是3个字符
{
   if(extrName)//=========如果有扩展名, 将扩展名放入uBuf 和数据一样加密
   {
    uBuf[i]= 0;
    *((char*)(&uBuf[i])) = extrName[i];
   }
   else
    uBuf[i]= 0;
}
if(extrName)//===============如果有扩展名, 将扩展名加密
   TxtEncrypt(uBuf, 3,PublicKey,mod);
fwrite( (char*)uBuf,1, 3*sizeof(unsigned int), fipWr);//密文前12个,字节中是源文件的 扩展名信息
do
{
   ReSize= fread(cBuf, 1, BUFFER_SIZE,fipRe);
   if(ReSize)
   {
    unsigned int record=1;
    unsigned int WrNum;
    for(i=0; i < ReSize; i++)
    {
     uBuf[i]= 0;
     *((char*)(&uBuf[i])) = (cBuf[i]) ;
    }     TxtEncrypt(uBuf, ReSize,PublicKey,mod);     WrNum= fwrite( (char*)uBuf,1, ReSize*sizeof(unsigned int), fipWr);
    printf("第%d次写入%d字节!\n",record++, WrNum);
   }
}while(ReSize == BUFFER_SIZE);
}
void CENCRYPTION::Explain(UINT PrivateKey, UINT mod, FILE* fipRe, FILE* fipWr )
{
unsigned int ReSize;
unsigned int uBuf[BUFFER_SIZE]= {0,};
char cBuf[BUFFER_SIZE];
do
{
   ReSize= fread(uBuf, sizeof(unsigned int), BUFFER_SIZE,fipRe);
   if(ReSize)
   {
    unsigned int i;
    unsigned int record=1;
    unsigned int WrNum;
    TxtEncrypt(uBuf, ReSize,PrivateKey,mod);
    for(i=0; i<ReSize; i++)
     cBuf[i]= (char)(uBuf[i]);
    WrNum= fwrite( cBuf,1, ReSize, fipWr);   
    printf("第%d次写入%d字节!\n",record++, WrNum);
   }

}while(ReSize == BUFFER_SIZE);
}