Remove cryptoppwin submodule (#754)

third_party/cryptoppwin/include/cryptopp/eprecomp.h

@@ -0,0 +1,162 @@
+// eprecomp.h - originally 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)
+
+/// \brief DL_GroupPrecomputation interface
+/// \tparam T Field element
+template <class T>
+class DL_GroupPrecomputation
+{
+public:
+	typedef T Element;
+
+	virtual ~DL_GroupPrecomputation() {}
+
+	/// \brief Determines if elements needs conversion
+	/// \return true if the element needs conversion, false otherwise
+	/// \details NeedConversions determines if an element must convert between representations.
+	virtual bool NeedConversions() const {return false;}
+
+	/// \brief Converts an element between representations
+	/// \param v element to convert
+	/// \return an element converted to an alternate representation for internal use
+	/// \details ConvertIn is used when an element must convert between representations.
+	virtual Element ConvertIn(const Element &v) const {return v;}
+
+	/// \brief Converts an element between representations
+	/// \param v element to convert
+	/// \return an element converted from an alternate representation
+	virtual Element ConvertOut(const Element &v) const {return v;}
+
+	/// \brief Retrieves AbstractGroup interface
+	/// \return GetGroup() returns the AbstractGroup interface
+	virtual const AbstractGroup<Element> & GetGroup() const =0;
+
+	/// \brief Decodes element in DER format
+	/// \param bt BufferedTransformation object
+	/// \return element in the group
+	virtual Element BERDecodeElement(BufferedTransformation &bt) const =0;
+
+	/// \brief Encodes element in DER format
+	/// \param bt BufferedTransformation object
+	/// \param P Element to encode
+	virtual void DEREncodeElement(BufferedTransformation &bt, const Element &P) const =0;
+};
+
+/// \brief DL_FixedBasePrecomputation interface
+/// \tparam T Field element
+template <class T>
+class DL_FixedBasePrecomputation
+{
+public:
+	typedef T Element;
+
+	virtual ~DL_FixedBasePrecomputation() {}
+
+	/// \brief Determines whether this object is initialized
+	/// \return true if this object is initialized, false otherwise
+	virtual bool IsInitialized() const =0;
+
+	/// \brief Set the base element
+	/// \param group the group
+	/// \param base element in the group
+	virtual void SetBase(const DL_GroupPrecomputation<Element> &group, const Element &base) =0;
+
+	/// \brief Get the base element
+	/// \param group the group
+	/// \return base element in the group
+	virtual const Element & GetBase(const DL_GroupPrecomputation<Element> &group) const =0;
+
+	/// \brief Perform precomputation
+	/// \param group the group
+	/// \param maxExpBits used to calculate the exponent base
+	/// \param storage the suggested number of objects for the precompute table
+	/// \details The exact semantics of Precompute() varies, but it typically means calculate
+	///   a table of n objects that can be used later to speed up computation.
+	/// \details If a derived class does not override Precompute(), then the base class throws
+	///   NotImplemented.
+	/// \sa SupportsPrecomputation(), LoadPrecomputation(), SavePrecomputation()
+	virtual void Precompute(const DL_GroupPrecomputation<Element> &group, unsigned int maxExpBits, unsigned int storage) =0;
+
+	/// \brief Retrieve previously saved precomputation
+	/// \param group the group
+	/// \param storedPrecomputation BufferedTransformation with the saved precomputation
+	/// \throw NotImplemented
+	/// \sa SupportsPrecomputation(), Precompute()
+	virtual void Load(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) =0;
+
+	/// \brief Save precomputation for later use
+	/// \param group the group
+	/// \param storedPrecomputation BufferedTransformation to write the precomputation
+	/// \throw NotImplemented
+	/// \sa SupportsPrecomputation(), Precompute()
+	virtual void Save(const DL_GroupPrecomputation<Element> &group, BufferedTransformation &storedPrecomputation) const =0;
+
+	/// \brief Exponentiates an element
+	/// \param group the group
+	/// \param exponent the exponent
+	/// \return the result of the exponentiation
+	virtual Element Exponentiate(const DL_GroupPrecomputation<Element> &group, const Integer &exponent) const =0;
+
+	/// \brief Exponentiates an element
+	/// \param pc1 the first the group precomputation
+	/// \param exponent1 the first exponent
+	/// \param pc2 the second the group precomputation
+	/// \param exponent2 the first exponent2
+	/// \return the public element raised to the exponent
+	/// \details CascadeExponentiateBaseAndPublicElement raises the public element to
+	///   the base element and precomputation.
+	virtual Element CascadeExponentiate(const DL_GroupPrecomputation<Element> &pc1, const Integer &exponent1, const DL_FixedBasePrecomputation<Element> &pc2, const Integer &exponent2) const =0;
+};
+
+/// \brief DL_FixedBasePrecomputation adapter class
+/// \tparam T Field element
+template <class T>
+class DL_FixedBasePrecomputationImpl : public DL_FixedBasePrecomputation<T>
+{
+public:
+	typedef T Element;
+
+	virtual ~DL_FixedBasePrecomputationImpl() {}
+
+	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> &pc1, const Integer &exponent1, 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