vlongvalue.h

椭圆曲线密码C实现的

class flex_unit // Provides storage allocation and index checking
{
  unsigned *a; // array of units
  unsigned	z; // units allocated
public:
  unsigned	n; // used units (read-only)
  flex_unit();
  ~flex_unit();
  void		clear(); // set n to zero
  unsigned	get( unsigned i ) const;     // get ith unsigned
  void		set( unsigned i, unsigned x );   // set ith unsigned
  void		reserve( unsigned x );           // storage hint

  // Time critical routine
  void		fast_mul( flex_unit &x, flex_unit &y, unsigned n );
};


class vlong_value : public flex_unit
{
  public:
  unsigned	share; // share count, used by vlong to delay physical copying
  int		is_zero() const;
  int		test( unsigned i ) const;
  unsigned	bits() const;
  int		cf( vlong_value& x ) const;
  void		shl();			
  void		shr();
  void		shr( unsigned n );
  void		add( vlong_value& x );
  void		subtract( vlong_value& x );
  void		init( unsigned x );
  void		copy( vlong_value& x );
  operator	unsigned(); // Unsafe conversion to unsigned
  vlong_value();
  void		mul( vlong_value& x, vlong_value& y );
  void		divide( vlong_value& x, vlong_value& y, vlong_value& rem );
};


// Macros for doing double precision multiply
#define	BPU		( 8*sizeof(unsigned) )			// Number of bits in an unsigned
#define	lo(x)	( (x) & ((1<<(BPU/2))-1) )	// lower half of unsigned
#define	hi(x)	( (x) >> (BPU/2) )			// upper half
#define	lh(x)	( (x) << (BPU/2) )			// make upper half