Team Fortress 2 Source Code as on 22/4/2020
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// eprecomp.h - written and placed in the public domain by Wei Dai
//! \file eprecomp.h
//! \brief Classes for precomputation in a group
#ifndef CRYPTOPP_EPRECOMP_H
#define CRYPTOPP_EPRECOMP_H
#include "cryptlib.h"
#include "integer.h"
#include "algebra.h"
#include "stdcpp.h"
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; #ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
virtual ~DL_GroupPrecomputation() {}#endif
};
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;
#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
virtual ~DL_FixedBasePrecomputation() {}#endif
};
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;
#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
virtual ~DL_FixedBasePrecomputationImpl() {}#endif
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
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