eprecomp.h

来自「各种加密算法的集合」· C头文件 代码 · 共 44 行

#ifndef CRYPTOPP_EPRECOMP_H 
#define CRYPTOPP_EPRECOMP_H 
 
#include "integer.h" 
#include <vector> 
 
NAMESPACE_BEGIN(CryptoPP) 
 
// Please do not directly use the following class.  It should be 
// considered a private class for the library.  The following 
// classes are public and use ExponentiationPrecomputation internally. 
// 
// ModExpPrecomputation; 
// EcPrecomputation<EC2N>; 
// EcPrecomputation<ECP>; 
 
template <class T> class ExponentiationPrecomputation 
{ 
public: 
	typedef T Group; 
	typedef typename Group::Element Element; 
 
	ExponentiationPrecomputation(const Group &group) : group(group) {} 
 
	ExponentiationPrecomputation(const Group &group, const Element &base, unsigned int maxExpBits, unsigned int storage) 
		: group(group), storage(storage), g(storage) {Precompute(base, maxExpBits);} 
 
	ExponentiationPrecomputation(const Group &group, const ExponentiationPrecomputation &pc) 
		: group(group), storage(pc.storage), exponentBase(pc.exponentBase), g(pc.g)	{} 
 
	void Precompute(const Element &base, unsigned int maxExpBits); 
	Element Exponentiate(const Integer &exponent) const; 
	Element CascadeExponentiate(const Integer &exponent, const ExponentiationPrecomputation<Group> &pc2, const Integer &exponent2) const; 
 
	const Group &group; 
	unsigned int storage;	// number of precalculated bases 
	Integer exponentBase;	// what base to represent the exponent in 
	std::vector<Element> g;		// precalculated bases 
}; 
 
NAMESPACE_END 
 
#endif