superint.h

rsa加密过程中需要大数的幂运算后求模

// Superint.h: interface for the CSuperint class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_SUPERINT_H__30C10649_388F_48A0_B6FA_208800F697D5__INCLUDED_)
#define AFX_SUPERINT_H__30C10649_388F_48A0_B6FA_208800F697D5__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CSuperint  
{
public:
	int GetHex(TCHAR *pBuffer, int iBufferSize);
	
	CSuperint operator %(const CSuperint&siRight)const;
	CSuperint operator *(const CSuperint &siMultting)const;
	CSuperint operator -(const CSuperint &siSubbing)const;
	CSuperint operator +(const CSuperint &siAdding)const;
	BOOL operator >=(const CSuperint &siRight)const;

	BOOL IsBitOn(int iBitIndex)const;
	int GetUsedBits()const;

	CSuperint(const TCHAR *pInit);
	CSuperint(DWORD dwInit = 0);
	CSuperint(const CSuperint &siSource);
	void operator =(const CSuperint &siSource);
	virtual ~CSuperint();
protected:
	void Expand(int iUsing = 0);
	int m_BufferSize;
	int m_BufferUsed;
	DWORD *m_pdwBuffer;
private:
	void MulUnit(int iUnitIndex, DWORD dwMultting);
	void SubUnit(int iUnitIndex, DWORD dwSubbing);
	void AddUnit(int iUnitIndex, DWORD dwAdding);
};

#endif // !defined(AFX_SUPERINT_H__30C10649_388F_48A0_B6FA_208800F697D5__INCLUDED_)