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author | madmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6> | 2012-08-30 23:06:13 +0200 |
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committer | madmaxoft@gmail.com <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6> | 2012-08-30 23:06:13 +0200 |
commit | 539364846a89987ac2679988653f50332cb91d26 (patch) | |
tree | f1695473c1f493a19c5fbdb70f7f1faccf99d7f3 /CryptoPP/eprecomp.h | |
parent | Updated to V6 - "Stop" and "Progress report" functionality (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | CryptoPP/eprecomp.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/CryptoPP/eprecomp.h b/CryptoPP/eprecomp.h new file mode 100644 index 000000000..1f3256766 --- /dev/null +++ b/CryptoPP/eprecomp.h @@ -0,0 +1,75 @@ +#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 |