diff options
| author | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
|---|---|---|
| committer | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
| commit | 48540940b6c28bb4378abfeb500ec45a625b37b6 (patch) | |
| tree | 2ef294c0763e802f91d868bdef4229b6868527de /plugins/CryptoPP/crypto/eprecomp.h | |
| parent | 5c350913f011e119127baeb32a6aedeb4f0d33bc (diff) | |
initial commit
git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Diffstat (limited to 'plugins/CryptoPP/crypto/eprecomp.h')
| -rw-r--r-- | plugins/CryptoPP/crypto/eprecomp.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/eprecomp.h b/plugins/CryptoPP/crypto/eprecomp.h new file mode 100644 index 0000000000..ade6c3400a --- /dev/null +++ b/plugins/CryptoPP/crypto/eprecomp.h @@ -0,0 +1,73 @@ +#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_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
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