You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
3.0 KiB
76 lines
3.0 KiB
![]()
4 years ago
|
#ifndef CRYPTOPP_EPRECOMP_H
|
||
|
#define CRYPTOPP_EPRECOMP_H
|
||
|
|
||
|
#include "integer.h"
|
||
|
#include "algebra.h"
|
||
|
#include <vector>
|
||
|
|
||
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
||
|
template <class T>
|
||
|
class DL_GroupPrecomputation
|
||
|
{
|
||
|
public:
|
||
|
typedef T Element;
|
||
|
|
||
|
virtual bool NeedConversions() const {return false;}
|
||
|
virtual Element ConvertIn(const Element &v) const {return v;}
|
||
|
virtual Element ConvertOut(const Element &v) const {return v;}
|
||
|
virtual const AbstractGroup<Element> & GetGroup() const =0;
|
||
|
virtual Element BERDecodeElement(BufferedTransformation &bt) const =0;
|
||
|
virtual void DEREncodeElement(BufferedTransformation &bt, const Element &P) const =0;
|
||
|
};
|
||
|
|
||
|
template <class T>
|
||
|
class DL_FixedBasePrecomputation
|
||
|
{
|
||
|
public:
|
||
|
typedef T Element;
|
||
|
|
||
|
virtual bool IsInitialized() const =0;
|
||
|
virtual void SetBase(const DL_GroupPrecomputation<Element> &group, const Element &base) =0;
|
||
|
virtual const Element & GetBase(const DL_GroupPrecomputation<Element> &group) const =0;
|
||
|
virtual void Precompute(const DL_GroupPrecomputation<Element> &group, unsigned int maxExpBits, unsigned int storage) =0;
|
||
|
virtual void Load(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) =0;
|
||
|
virtual void Save(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) const =0;
|
||
|
virtual Element Exponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent) const =0;
|
||
|
virtual Element CascadeExponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent, const DL_FixedBasePrecomputation<Element> &pc2, const Integer &exponent2) const =0;
|
||
|
};
|
||
|
|
||
|
template <class T>
|
||
|
class DL_FixedBasePrecomputationImpl : public DL_FixedBasePrecomputation<T>
|
||
|
{
|
||
|
public:
|
||
|
typedef T Element;
|
||
|
|
||
|
DL_FixedBasePrecomputationImpl() : m_windowSize(0) {}
|
||
|
|
||
|
// DL_FixedBasePrecomputation
|
||
|
bool IsInitialized() const
|
||
|
{return !m_bases.empty();}
|
||
|
void SetBase(const DL_GroupPrecomputation<Element> &group, const Element &base);
|
||
|
const Element & GetBase(const DL_GroupPrecomputation<Element> &group) const
|
||
|
{return group.NeedConversions() ? m_base : m_bases[0];}
|
||
|
void Precompute(const DL_GroupPrecomputation<Element> &group, unsigned int maxExpBits, unsigned int storage);
|
||
|
void Load(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation);
|
||
|
void Save(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) const;
|
||
|
Element Exponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent) const;
|
||
|
Element CascadeExponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent, const DL_FixedBasePrecomputation<Element> &pc2, const Integer &exponent2) const;
|
||
|
|
||
|
private:
|
||
|
void PrepareCascade(const DL_GroupPrecomputation<Element> &group, std::vector<BaseAndExponent<Element> > &eb, const Integer &exponent) const;
|
||
|
|
||
|
Element m_base;
|
||
|
unsigned int m_windowSize;
|
||
|
Integer m_exponentBase; // what base to represent the exponent in
|
||
|
std::vector<Element> m_bases; // precalculated bases
|
||
|
};
|
||
|
|
||
|
NAMESPACE_END
|
||
|
|
||
|
#ifdef CRYPTOPP_MANUALLY_INSTANTIATE_TEMPLATES
|
||
|
#include "eprecomp.cpp"
|
||
|
#endif
|
||
|
|
||
|
#endif
|