Remove cryptoppwin submodule (#754)

third_party/cryptoppwin/include/cryptopp/ec2n.h

@@ -0,0 +1,136 @@
+// ec2n.h - originally written and placed in the public domain by Wei Dai
+
+/// \file ec2n.h
+/// \brief Classes for Elliptic Curves over binary fields
+
+#ifndef CRYPTOPP_EC2N_H
+#define CRYPTOPP_EC2N_H
+
+#include "cryptlib.h"
+#include "gf2n.h"
+#include "integer.h"
+#include "algebra.h"
+#include "ecpoint.h"
+#include "eprecomp.h"
+#include "smartptr.h"
+#include "pubkey.h"
+
+#if CRYPTOPP_MSC_VERSION
+# pragma warning(push)
+# pragma warning(disable: 4231 4275)
+#endif
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief Elliptic Curve over GF(2^n)
+class CRYPTOPP_DLL EC2N : public AbstractGroup<EC2NPoint>, public EncodedPoint<EC2NPoint>
+{
+public:
+	typedef GF2NP Field;
+	typedef Field::Element FieldElement;
+	typedef EC2NPoint Point;
+
+	virtual ~EC2N() {}
+
+	/// \brief Construct an EC2N
+	EC2N() {}
+
+	/// \brief Construct an EC2N
+	/// \param field Field, GF2NP derived class
+	/// \param a Field::Element
+	/// \param b Field::Element
+	EC2N(const Field &field, const Field::Element &a, const Field::Element &b)
+		: m_field(field), m_a(a), m_b(b) {}
+
+	/// \brief Construct an EC2N from BER encoded parameters
+	/// \param bt BufferedTransformation derived object
+	/// \details This constructor will decode and extract the fields fieldID and curve of the sequence ECParameters
+	EC2N(BufferedTransformation &bt);
+
+	/// \brief Encode the fields fieldID and curve of the sequence ECParameters
+	/// \param bt BufferedTransformation derived object
+	void DEREncode(BufferedTransformation &bt) const;
+
+	bool Equal(const Point &P, const Point &Q) const;
+	const Point& Identity() const;
+	const Point& Inverse(const Point &P) const;
+	bool InversionIsFast() const {return true;}
+	const Point& Add(const Point &P, const Point &Q) const;
+	const Point& Double(const Point &P) const;
+
+	Point Multiply(const Integer &k, const Point &P) const
+		{return ScalarMultiply(P, k);}
+	Point CascadeMultiply(const Integer &k1, const Point &P, const Integer &k2, const Point &Q) const
+		{return CascadeScalarMultiply(P, k1, Q, k2);}
+
+	bool ValidateParameters(RandomNumberGenerator &rng, unsigned int level=3) const;
+	bool VerifyPoint(const Point &P) const;
+
+	unsigned int EncodedPointSize(bool compressed = false) const
+		{return 1 + (compressed?1:2)*m_field->MaxElementByteLength();}
+	// returns false if point is compressed and not valid (doesn't check if uncompressed)
+	bool DecodePoint(Point &P, BufferedTransformation &bt, size_t len) const;
+	bool DecodePoint(Point &P, const byte *encodedPoint, size_t len) const;
+	void EncodePoint(byte *encodedPoint, const Point &P, bool compressed) const;
+	void EncodePoint(BufferedTransformation &bt, const Point &P, bool compressed) const;
+
+	Point BERDecodePoint(BufferedTransformation &bt) const;
+	void DEREncodePoint(BufferedTransformation &bt, const Point &P, bool compressed) const;
+
+	Integer FieldSize() const {return Integer::Power2(m_field->MaxElementBitLength());}
+	const Field & GetField() const {return *m_field;}
+	const FieldElement & GetA() const {return m_a;}
+	const FieldElement & GetB() const {return m_b;}
+
+	bool operator==(const EC2N &rhs) const
+		{return GetField() == rhs.GetField() && m_a == rhs.m_a && m_b == rhs.m_b;}
+
+private:
+	clonable_ptr<Field> m_field;
+	FieldElement m_a, m_b;
+	mutable Point m_R;
+};
+
+CRYPTOPP_DLL_TEMPLATE_CLASS DL_FixedBasePrecomputationImpl<EC2N::Point>;
+CRYPTOPP_DLL_TEMPLATE_CLASS DL_GroupPrecomputation<EC2N::Point>;
+
+/// \brief Elliptic Curve precomputation
+/// \tparam EC elliptic curve field
+template <class EC> class EcPrecomputation;
+
+/// \brief EC2N precomputation specialization
+/// \details Implementation of <tt>DL_GroupPrecomputation<EC2N::Point></tt>
+/// \sa DL_GroupPrecomputation
+template<> class EcPrecomputation<EC2N> : public DL_GroupPrecomputation<EC2N::Point>
+{
+public:
+	typedef EC2N EllipticCurve;
+
+	virtual ~EcPrecomputation() {}
+
+	// DL_GroupPrecomputation
+	const AbstractGroup<Element> & GetGroup() const {return m_ec;}
+	Element BERDecodeElement(BufferedTransformation &bt) const {return m_ec.BERDecodePoint(bt);}
+	void DEREncodeElement(BufferedTransformation &bt, const Element &v) const {m_ec.DEREncodePoint(bt, v, false);}
+
+	/// \brief Set the elliptic curve
+	/// \param ec ECP derived class
+	/// \details SetCurve() is not inherited
+	void SetCurve(const EC2N &ec) {m_ec = ec;}
+
+	/// \brief Get the elliptic curve
+	/// \return EC2N curve
+	/// \details GetCurve() is not inherited
+	const EC2N & GetCurve() const {return m_ec;}
+
+private:
+	EC2N m_ec;
+};
+
+NAMESPACE_END
+
+#if CRYPTOPP_MSC_VERSION
+# pragma warning(pop)
+#endif
+
+#endif