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#ifndef CP_RSA_H
#define CP_RSA_H

#include <stddef.h>

// VLONG.HPP ---------------------------------

class vlong // very long integer - can be used like long
{
public:
	// Standard arithmetic operators
	friend vlong operator +( const vlong& x, const vlong& y );
	friend vlong operator -( const vlong& x, const vlong& y );
	friend vlong operator *( const vlong& x, const vlong& y );
	friend vlong operator /( const vlong& x, const vlong& y );
	friend vlong operator %( const vlong& x, const vlong& y );
	vlong& operator +=( const vlong& x );
	vlong& operator -=( const vlong& x );

	// Standard comparison operators
	friend inline int operator !=( const vlong& x, const vlong& y ){ return x.cf( y ) != 0; }
	friend inline int operator ==( const vlong& x, const vlong& y ){ return x.cf( y ) == 0; }
	friend inline int operator >=( const vlong& x, const vlong& y ){ return x.cf( y ) >= 0; }
	friend inline int operator <=( const vlong& x, const vlong& y ){ return x.cf( y ) <= 0; }
	friend inline int operator > ( const vlong& x, const vlong& y ){ return x.cf( y ) > 0; }
	friend inline int operator < ( const vlong& x, const vlong& y ){ return x.cf( y ) < 0; }

	// Construction and conversion operations
	vlong ( unsigned x=0 );
	vlong ( const vlong& x ); // copy constructor
	~vlong();
	operator unsigned ();
	vlong& operator =(const vlong& x);

	void load( unsigned * a, unsigned n ); // load value, a[0] is lsw
	void store( unsigned * a, unsigned n ) const; // low level save, a[0] is lsw
	unsigned get_nunits() const;
	unsigned bits() const;

private:
	class vlong_value * value;
	int negative;
	int cf( const vlong x ) const;
	void docopy();
	friend class monty;
};

// RSA.HPP -------------------------------------------

class public_key
{
	public:
	vlong m,e;
	vlong encrypt( const vlong& plain ); // Requires 0 <= plain < m
	void MakeMe(const char *);
};

class private_key : public public_key
{
	public:
	vlong p,q;
	vlong decrypt( const vlong& cipher );

	void create( const char * r1, const char * r2 );
	// r1 and r2 should be null terminated random strings
	// each of length around 35 characters (for a 500 bit modulus)

	void MakeMeStr(char *);
	void MakePq(const char *);
	void MakePqStr(char *);
};

#define MAX_CRYPT_BITS 1024

class CCryptoProviderRSA
{
	class private_key prkface;

	void EncryptPortion(const char *pt, size_t,char *ct,size_t &);
	void DecryptPortion(const char *ct, size_t,char *pt,size_t &);

public:

	CCryptoProviderRSA();
	virtual ~CCryptoProviderRSA();

	virtual void Encrypt(const char *, size_t,char *, size_t &);
	virtual void Decrypt(const char *, size_t,char *, size_t &);
	virtual void ExportPublicKey(char *);
	virtual void ImportPublicKey(const char *);
	virtual void ExportPrivateKey(char *);
	virtual void ImportPrivateKey(const char *);
	virtual void GetBlockSize(int&, int&);
};

#endif