1 files changed, 1678 insertions, 0 deletions

diff --git a/CryptoPP/pubkey.h b/CryptoPP/pubkey.h
new file mode 100644
index 000000000..3a3f3bcde
--- /dev/null
+++ b/CryptoPP/pubkey.h
@@ -0,0 +1,1678 @@
+// pubkey.h - written and placed in the public domain by Wei Dai
+
+#ifndef CRYPTOPP_PUBKEY_H
+#define CRYPTOPP_PUBKEY_H
+
+/** \file
+
+	This file contains helper classes/functions for implementing public key algorithms.
+
+	The class hierachies in this .h file tend to look like this:
+<pre>
+                  x1
+                 / \
+                y1  z1
+                 |  |
+            x2<y1>  x2<z1>
+                 |  |
+                y2  z2
+                 |  |
+            x3<y2>  x3<z2>
+                 |  |
+                y3  z3
+</pre>
+	- x1, y1, z1 are abstract interface classes defined in cryptlib.h
+	- x2, y2, z2 are implementations of the interfaces using "abstract policies", which
+	  are pure virtual functions that should return interfaces to interchangeable algorithms.
+	  These classes have "Base" suffixes.
+	- x3, y3, z3 hold actual algorithms and implement those virtual functions.
+	  These classes have "Impl" suffixes.
+
+	The "TF_" prefix means an implementation using trapdoor functions on integers.
+	The "DL_" prefix means an implementation using group operations (in groups where discrete log is hard).
+*/
+
+#include "modarith.h"
+#include "filters.h"
+#include "eprecomp.h"
+#include "fips140.h"
+#include "argnames.h"
+#include <memory>
+
+// VC60 workaround: this macro is defined in shlobj.h and conflicts with a template parameter used in this file
+#undef INTERFACE
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunctionBounds
+{
+public:
+	virtual ~TrapdoorFunctionBounds() {}
+
+	virtual Integer PreimageBound() const =0;
+	virtual Integer ImageBound() const =0;
+	virtual Integer MaxPreimage() const {return --PreimageBound();}
+	virtual Integer MaxImage() const {return --ImageBound();}
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomizedTrapdoorFunction : public TrapdoorFunctionBounds
+{
+public:
+	virtual Integer ApplyRandomizedFunction(RandomNumberGenerator &rng, const Integer &x) const =0;
+	virtual bool IsRandomized() const {return true;}
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunction : public RandomizedTrapdoorFunction
+{
+public:
+	Integer ApplyRandomizedFunction(RandomNumberGenerator &rng, const Integer &x) const
+		{return ApplyFunction(x);}
+	bool IsRandomized() const {return false;}
+
+	virtual Integer ApplyFunction(const Integer &x) const =0;
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE RandomizedTrapdoorFunctionInverse
+{
+public:
+	virtual ~RandomizedTrapdoorFunctionInverse() {}
+
+	virtual Integer CalculateRandomizedInverse(RandomNumberGenerator &rng, const Integer &x) const =0;
+	virtual bool IsRandomized() const {return true;}
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TrapdoorFunctionInverse : public RandomizedTrapdoorFunctionInverse
+{
+public:
+	virtual ~TrapdoorFunctionInverse() {}
+
+	Integer CalculateRandomizedInverse(RandomNumberGenerator &rng, const Integer &x) const
+		{return CalculateInverse(rng, x);}
+	bool IsRandomized() const {return false;}
+
+	virtual Integer CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const =0;
+};
+
+// ********************************************************
+
+//! message encoding method for public key encryption
+class CRYPTOPP_NO_VTABLE PK_EncryptionMessageEncodingMethod
+{
+public:
+	virtual ~PK_EncryptionMessageEncodingMethod() {}
+
+	virtual bool ParameterSupported(const char *name) const {return false;}
+
+	//! max size of unpadded message in bytes, given max size of padded message in bits (1 less than size of modulus)
+	virtual size_t MaxUnpaddedLength(size_t paddedLength) const =0;
+
+	virtual void Pad(RandomNumberGenerator &rng, const byte *raw, size_t inputLength, byte *padded, size_t paddedBitLength, const NameValuePairs &parameters) const =0;
+
+	virtual DecodingResult Unpad(const byte *padded, size_t paddedBitLength, byte *raw, const NameValuePairs &parameters) const =0;
+};
+
+// ********************************************************
+
+//! _
+template <class TFI, class MEI>
+class CRYPTOPP_NO_VTABLE TF_Base
+{
+protected:
+	virtual const TrapdoorFunctionBounds & GetTrapdoorFunctionBounds() const =0;
+
+	typedef TFI TrapdoorFunctionInterface;
+	virtual const TrapdoorFunctionInterface & GetTrapdoorFunctionInterface() const =0;
+
+	typedef MEI MessageEncodingInterface;
+	virtual const MessageEncodingInterface & GetMessageEncodingInterface() const =0;
+};
+
+// ********************************************************
+
+//! _
+template <class BASE>
+class CRYPTOPP_NO_VTABLE PK_FixedLengthCryptoSystemImpl : public BASE
+{
+public:
+	size_t MaxPlaintextLength(size_t ciphertextLength) const
+		{return ciphertextLength == FixedCiphertextLength() ? FixedMaxPlaintextLength() : 0;}
+	size_t CiphertextLength(size_t plaintextLength) const
+		{return plaintextLength <= FixedMaxPlaintextLength() ? FixedCiphertextLength() : 0;}
+
+	virtual size_t FixedMaxPlaintextLength() const =0;
+	virtual size_t FixedCiphertextLength() const =0;
+};
+
+//! _
+template <class INTERFACE, class BASE>
+class CRYPTOPP_NO_VTABLE TF_CryptoSystemBase : public PK_FixedLengthCryptoSystemImpl<INTERFACE>, protected BASE
+{
+public:
+	bool ParameterSupported(const char *name) const {return this->GetMessageEncodingInterface().ParameterSupported(name);}
+	size_t FixedMaxPlaintextLength() const {return this->GetMessageEncodingInterface().MaxUnpaddedLength(PaddedBlockBitLength());}
+	size_t FixedCiphertextLength() const {return this->GetTrapdoorFunctionBounds().MaxImage().ByteCount();}
+
+protected:
+	size_t PaddedBlockByteLength() const {return BitsToBytes(PaddedBlockBitLength());}
+	size_t PaddedBlockBitLength() const {return this->GetTrapdoorFunctionBounds().PreimageBound().BitCount()-1;}
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_DecryptorBase : public TF_CryptoSystemBase<PK_Decryptor, TF_Base<TrapdoorFunctionInverse, PK_EncryptionMessageEncodingMethod> >
+{
+public:
+	DecodingResult Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters = g_nullNameValuePairs) const;
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_EncryptorBase : public TF_CryptoSystemBase<PK_Encryptor, TF_Base<RandomizedTrapdoorFunction, PK_EncryptionMessageEncodingMethod> >
+{
+public:
+	void Encrypt(RandomNumberGenerator &rng, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs &parameters = g_nullNameValuePairs) const;
+};
+
+// ********************************************************
+
+typedef std::pair<const byte *, size_t> HashIdentifier;
+
+//! interface for message encoding method for public key signature schemes
+class CRYPTOPP_NO_VTABLE PK_SignatureMessageEncodingMethod
+{
+public:
+	virtual ~PK_SignatureMessageEncodingMethod() {}
+
+	virtual size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const
+		{return 0;}
+	virtual size_t MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const
+		{return 0;}
+
+	bool IsProbabilistic() const 
+		{return true;}
+	bool AllowNonrecoverablePart() const
+		{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
+	virtual bool RecoverablePartFirst() const
+		{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
+
+	// for verification, DL
+	virtual void ProcessSemisignature(HashTransformation &hash, const byte *semisignature, size_t semisignatureLength) const {}
+
+	// for signature
+	virtual void ProcessRecoverableMessage(HashTransformation &hash, 
+		const byte *recoverableMessage, size_t recoverableMessageLength, 
+		const byte *presignature, size_t presignatureLength,
+		SecByteBlock &semisignature) const
+	{
+		if (RecoverablePartFirst())
+			assert(!"ProcessRecoverableMessage() not implemented");
+	}
+
+	virtual void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
+		const byte *recoverableMessage, size_t recoverableMessageLength,
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const =0;
+
+	virtual bool VerifyMessageRepresentative(
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const =0;
+
+	virtual DecodingResult RecoverMessageFromRepresentative(	// for TF
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength,
+		byte *recoveredMessage) const
+		{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
+
+	virtual DecodingResult RecoverMessageFromSemisignature(		// for DL
+		HashTransformation &hash, HashIdentifier hashIdentifier,
+		const byte *presignature, size_t presignatureLength,
+		const byte *semisignature, size_t semisignatureLength,
+		byte *recoveredMessage) const
+		{throw NotImplemented("PK_MessageEncodingMethod: this signature scheme does not support message recovery");}
+
+	// VC60 workaround
+	struct HashIdentifierLookup
+	{
+		template <class H> struct HashIdentifierLookup2
+		{
+			static HashIdentifier CRYPTOPP_API Lookup()
+			{
+				return HashIdentifier((const byte *)NULL, 0);
+			}
+		};
+	};
+};
+
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_DeterministicSignatureMessageEncodingMethod : public PK_SignatureMessageEncodingMethod
+{
+public:
+	bool VerifyMessageRepresentative(
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const;
+};
+
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_RecoverableSignatureMessageEncodingMethod : public PK_SignatureMessageEncodingMethod
+{
+public:
+	bool VerifyMessageRepresentative(
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const;
+};
+
+class CRYPTOPP_DLL DL_SignatureMessageEncodingMethod_DSA : public PK_DeterministicSignatureMessageEncodingMethod
+{
+public:
+	void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
+		const byte *recoverableMessage, size_t recoverableMessageLength,
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const;
+};
+
+class CRYPTOPP_DLL DL_SignatureMessageEncodingMethod_NR : public PK_DeterministicSignatureMessageEncodingMethod
+{
+public:
+	void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
+		const byte *recoverableMessage, size_t recoverableMessageLength,
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const;
+};
+
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE PK_MessageAccumulatorBase : public PK_MessageAccumulator
+{
+public:
+	PK_MessageAccumulatorBase() : m_empty(true) {}
+
+	virtual HashTransformation & AccessHash() =0;
+
+	void Update(const byte *input, size_t length)
+	{
+		AccessHash().Update(input, length);
+		m_empty = m_empty && length == 0;
+	}
+
+	SecByteBlock m_recoverableMessage, m_representative, m_presignature, m_semisignature;
+	Integer m_k, m_s;
+	bool m_empty;
+};
+
+template <class HASH_ALGORITHM>
+class PK_MessageAccumulatorImpl : public PK_MessageAccumulatorBase, protected ObjectHolder<HASH_ALGORITHM>
+{
+public:
+	HashTransformation & AccessHash() {return this->m_object;}
+};
+
+//! _
+template <class INTERFACE, class BASE>
+class CRYPTOPP_NO_VTABLE TF_SignatureSchemeBase : public INTERFACE, protected BASE
+{
+public:
+	size_t SignatureLength() const 
+		{return this->GetTrapdoorFunctionBounds().MaxPreimage().ByteCount();}
+	size_t MaxRecoverableLength() const 
+		{return this->GetMessageEncodingInterface().MaxRecoverableLength(MessageRepresentativeBitLength(), GetHashIdentifier().second, GetDigestSize());}
+	size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
+		{return this->MaxRecoverableLength();}
+
+	bool IsProbabilistic() const 
+		{return this->GetTrapdoorFunctionInterface().IsRandomized() || this->GetMessageEncodingInterface().IsProbabilistic();}
+	bool AllowNonrecoverablePart() const 
+		{return this->GetMessageEncodingInterface().AllowNonrecoverablePart();}
+	bool RecoverablePartFirst() const 
+		{return this->GetMessageEncodingInterface().RecoverablePartFirst();}
+
+protected:
+	size_t MessageRepresentativeLength() const {return BitsToBytes(MessageRepresentativeBitLength());}
+	size_t MessageRepresentativeBitLength() const {return this->GetTrapdoorFunctionBounds().ImageBound().BitCount()-1;}
+	virtual HashIdentifier GetHashIdentifier() const =0;
+	virtual size_t GetDigestSize() const =0;
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_SignerBase : public TF_SignatureSchemeBase<PK_Signer, TF_Base<RandomizedTrapdoorFunctionInverse, PK_SignatureMessageEncodingMethod> >
+{
+public:
+	void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const;
+	size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart=true) const;
+};
+
+//! _
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TF_VerifierBase : public TF_SignatureSchemeBase<PK_Verifier, TF_Base<TrapdoorFunction, PK_SignatureMessageEncodingMethod> >
+{
+public:
+	void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const;
+	bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const;
+	DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &recoveryAccumulator) const;
+};
+
+// ********************************************************
+
+//! _
+template <class T1, class T2, class T3>
+struct TF_CryptoSchemeOptions
+{
+	typedef T1 AlgorithmInfo;
+	typedef T2 Keys;
+	typedef typename Keys::PrivateKey PrivateKey;
+	typedef typename Keys::PublicKey PublicKey;
+	typedef T3 MessageEncodingMethod;
+};
+
+//! _
+template <class T1, class T2, class T3, class T4>
+struct TF_SignatureSchemeOptions : public TF_CryptoSchemeOptions<T1, T2, T3>
+{
+	typedef T4 HashFunction;
+};
+
+//! _
+template <class BASE, class SCHEME_OPTIONS, class KEY_CLASS>
+class CRYPTOPP_NO_VTABLE TF_ObjectImplBase : public AlgorithmImpl<BASE, typename SCHEME_OPTIONS::AlgorithmInfo>
+{
+public:
+	typedef SCHEME_OPTIONS SchemeOptions;
+	typedef KEY_CLASS KeyClass;
+
+	PublicKey & AccessPublicKey() {return AccessKey();}
+	const PublicKey & GetPublicKey() const {return GetKey();}
+
+	PrivateKey & AccessPrivateKey() {return AccessKey();}
+	const PrivateKey & GetPrivateKey() const {return GetKey();}
+
+	virtual const KeyClass & GetKey() const =0;
+	virtual KeyClass & AccessKey() =0;
+
+	const KeyClass & GetTrapdoorFunction() const {return GetKey();}
+
+	PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const
+	{
+		return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
+	}
+	PK_MessageAccumulator * NewVerificationAccumulator() const
+	{
+		return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
+	}
+
+protected:
+	const typename BASE::MessageEncodingInterface & GetMessageEncodingInterface() const 
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::MessageEncodingMethod>().Ref();}
+	const TrapdoorFunctionBounds & GetTrapdoorFunctionBounds() const 
+		{return GetKey();}
+	const typename BASE::TrapdoorFunctionInterface & GetTrapdoorFunctionInterface() const 
+		{return GetKey();}
+
+	// for signature scheme
+	HashIdentifier GetHashIdentifier() const
+	{
+        typedef CPP_TYPENAME SchemeOptions::MessageEncodingMethod::HashIdentifierLookup::template HashIdentifierLookup2<CPP_TYPENAME SchemeOptions::HashFunction> L;
+        return L::Lookup();
+	}
+	size_t GetDigestSize() const
+	{
+		typedef CPP_TYPENAME SchemeOptions::HashFunction H;
+		return H::DIGESTSIZE;
+	}
+};
+
+//! _
+template <class BASE, class SCHEME_OPTIONS, class KEY>
+class TF_ObjectImplExtRef : public TF_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY>
+{
+public:
+	TF_ObjectImplExtRef(const KEY *pKey = NULL) : m_pKey(pKey) {}
+	void SetKeyPtr(const KEY *pKey) {m_pKey = pKey;}
+
+	const KEY & GetKey() const {return *m_pKey;}
+	KEY & AccessKey() {throw NotImplemented("TF_ObjectImplExtRef: cannot modify refererenced key");}
+
+private:
+	const KEY * m_pKey;
+};
+
+//! _
+template <class BASE, class SCHEME_OPTIONS, class KEY_CLASS>
+class CRYPTOPP_NO_VTABLE TF_ObjectImpl : public TF_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY_CLASS>
+{
+public:
+	typedef KEY_CLASS KeyClass;
+
+	const KeyClass & GetKey() const {return m_trapdoorFunction;}
+	KeyClass & AccessKey() {return m_trapdoorFunction;}
+
+private:
+	KeyClass m_trapdoorFunction;
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class TF_DecryptorImpl : public TF_ObjectImpl<TF_DecryptorBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
+{
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class TF_EncryptorImpl : public TF_ObjectImpl<TF_EncryptorBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
+{
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class TF_SignerImpl : public TF_ObjectImpl<TF_SignerBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
+{
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class TF_VerifierImpl : public TF_ObjectImpl<TF_VerifierBase, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
+{
+};
+
+// ********************************************************
+
+//! _
+class CRYPTOPP_NO_VTABLE MaskGeneratingFunction
+{
+public:
+	virtual ~MaskGeneratingFunction() {}
+	virtual void GenerateAndMask(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, bool mask = true) const =0;
+};
+
+CRYPTOPP_DLL void CRYPTOPP_API P1363_MGF1KDF2_Common(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, const byte *derivationParams, size_t derivationParamsLength, bool mask, unsigned int counterStart);
+
+//! _
+class P1363_MGF1 : public MaskGeneratingFunction
+{
+public:
+	static const char * CRYPTOPP_API StaticAlgorithmName() {return "MGF1";}
+	void GenerateAndMask(HashTransformation &hash, byte *output, size_t outputLength, const byte *input, size_t inputLength, bool mask = true) const
+	{
+		P1363_MGF1KDF2_Common(hash, output, outputLength, input, inputLength, NULL, 0, mask, 0);
+	}
+};
+
+// ********************************************************
+
+//! _
+template <class H>
+class P1363_KDF2
+{
+public:
+	static void CRYPTOPP_API DeriveKey(byte *output, size_t outputLength, const byte *input, size_t inputLength, const byte *derivationParams, size_t derivationParamsLength)
+	{
+		H h;
+		P1363_MGF1KDF2_Common(h, output, outputLength, input, inputLength, derivationParams, derivationParamsLength, false, 1);
+	}
+};
+
+// ********************************************************
+
+//! to be thrown by DecodeElement and AgreeWithStaticPrivateKey
+class DL_BadElement : public InvalidDataFormat
+{
+public:
+	DL_BadElement() : InvalidDataFormat("CryptoPP: invalid group element") {}
+};
+
+//! interface for DL group parameters
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_GroupParameters : public CryptoParameters
+{
+	typedef DL_GroupParameters<T> ThisClass;
+	
+public:
+	typedef T Element;
+
+	DL_GroupParameters() : m_validationLevel(0) {}
+
+	// CryptoMaterial
+	bool Validate(RandomNumberGenerator &rng, unsigned int level) const
+	{
+		if (!GetBasePrecomputation().IsInitialized())
+			return false;
+
+		if (m_validationLevel > level)
+			return true;
+
+		bool pass = ValidateGroup(rng, level);
+		pass = pass && ValidateElement(level, GetSubgroupGenerator(), &GetBasePrecomputation());
+
+		m_validationLevel = pass ? level+1 : 0;
+
+		return pass;
+	}
+
+	bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+	{
+		return GetValueHelper(this, name, valueType, pValue)
+			CRYPTOPP_GET_FUNCTION_ENTRY(SubgroupOrder)
+			CRYPTOPP_GET_FUNCTION_ENTRY(SubgroupGenerator)
+			;
+	}
+
+	bool SupportsPrecomputation() const {return true;}
+
+	void Precompute(unsigned int precomputationStorage=16)
+	{
+		AccessBasePrecomputation().Precompute(GetGroupPrecomputation(), GetSubgroupOrder().BitCount(), precomputationStorage);
+	}
+
+	void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
+	{
+		AccessBasePrecomputation().Load(GetGroupPrecomputation(), storedPrecomputation);
+		m_validationLevel = 0;
+	}
+
+	void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
+	{
+		GetBasePrecomputation().Save(GetGroupPrecomputation(), storedPrecomputation);
+	}
+
+	// non-inherited
+	virtual const Element & GetSubgroupGenerator() const {return GetBasePrecomputation().GetBase(GetGroupPrecomputation());}
+	virtual void SetSubgroupGenerator(const Element &base) {AccessBasePrecomputation().SetBase(GetGroupPrecomputation(), base);}
+	virtual Element ExponentiateBase(const Integer &exponent) const
+	{
+		return GetBasePrecomputation().Exponentiate(GetGroupPrecomputation(), exponent);
+	}
+	virtual Element ExponentiateElement(const Element &base, const Integer &exponent) const
+	{
+		Element result;
+		SimultaneousExponentiate(&result, base, &exponent, 1);
+		return result;
+	}
+
+	virtual const DL_GroupPrecomputation<Element> & GetGroupPrecomputation() const =0;
+	virtual const DL_FixedBasePrecomputation<Element> & GetBasePrecomputation() const =0;
+	virtual DL_FixedBasePrecomputation<Element> & AccessBasePrecomputation() =0;
+	virtual const Integer & GetSubgroupOrder() const =0;	// order of subgroup generated by base element
+	virtual Integer GetMaxExponent() const =0;
+	virtual Integer GetGroupOrder() const {return GetSubgroupOrder()*GetCofactor();}	// one of these two needs to be overriden
+	virtual Integer GetCofactor() const {return GetGroupOrder()/GetSubgroupOrder();}
+	virtual unsigned int GetEncodedElementSize(bool reversible) const =0;
+	virtual void EncodeElement(bool reversible, const Element &element, byte *encoded) const =0;
+	virtual Element DecodeElement(const byte *encoded, bool checkForGroupMembership) const =0;
+	virtual Integer ConvertElementToInteger(const Element &element) const =0;
+	virtual bool ValidateGroup(RandomNumberGenerator &rng, unsigned int level) const =0;
+	virtual bool ValidateElement(unsigned int level, const Element &element, const DL_FixedBasePrecomputation<Element> *precomp) const =0;
+	virtual bool FastSubgroupCheckAvailable() const =0;
+	virtual bool IsIdentity(const Element &element) const =0;
+	virtual void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const =0;
+
+protected:
+	void ParametersChanged() {m_validationLevel = 0;}
+
+private:
+	mutable unsigned int m_validationLevel;
+};
+
+//! _
+template <class GROUP_PRECOMP, class BASE_PRECOMP = DL_FixedBasePrecomputationImpl<CPP_TYPENAME GROUP_PRECOMP::Element>, class BASE = DL_GroupParameters<CPP_TYPENAME GROUP_PRECOMP::Element> >
+class DL_GroupParametersImpl : public BASE
+{
+public:
+	typedef GROUP_PRECOMP GroupPrecomputation;
+	typedef typename GROUP_PRECOMP::Element Element;
+	typedef BASE_PRECOMP BasePrecomputation;
+	
+	const DL_GroupPrecomputation<Element> & GetGroupPrecomputation() const {return m_groupPrecomputation;}
+	const DL_FixedBasePrecomputation<Element> & GetBasePrecomputation() const {return m_gpc;}
+	DL_FixedBasePrecomputation<Element> & AccessBasePrecomputation() {return m_gpc;}
+
+protected:
+	GROUP_PRECOMP m_groupPrecomputation;
+	BASE_PRECOMP m_gpc;
+};
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_Key
+{
+public:
+	virtual const DL_GroupParameters<T> & GetAbstractGroupParameters() const =0;
+	virtual DL_GroupParameters<T> & AccessAbstractGroupParameters() =0;
+};
+
+//! interface for DL public keys
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_PublicKey : public DL_Key<T>
+{
+	typedef DL_PublicKey<T> ThisClass;
+
+public:
+	typedef T Element;
+
+	bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+	{
+		return GetValueHelper(this, name, valueType, pValue, &this->GetAbstractGroupParameters())
+				CRYPTOPP_GET_FUNCTION_ENTRY(PublicElement);
+	}
+
+	void AssignFrom(const NameValuePairs &source);
+	
+	// non-inherited
+	virtual const Element & GetPublicElement() const {return GetPublicPrecomputation().GetBase(this->GetAbstractGroupParameters().GetGroupPrecomputation());}
+	virtual void SetPublicElement(const Element &y) {AccessPublicPrecomputation().SetBase(this->GetAbstractGroupParameters().GetGroupPrecomputation(), y);}
+	virtual Element ExponentiatePublicElement(const Integer &exponent) const
+	{
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		return GetPublicPrecomputation().Exponentiate(params.GetGroupPrecomputation(), exponent);
+	}
+	virtual Element CascadeExponentiateBaseAndPublicElement(const Integer &baseExp, const Integer &publicExp) const
+	{
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		return params.GetBasePrecomputation().CascadeExponentiate(params.GetGroupPrecomputation(), baseExp, GetPublicPrecomputation(), publicExp);
+	}
+
+	virtual const DL_FixedBasePrecomputation<T> & GetPublicPrecomputation() const =0;
+	virtual DL_FixedBasePrecomputation<T> & AccessPublicPrecomputation() =0;
+};
+
+//! interface for DL private keys
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_PrivateKey : public DL_Key<T>
+{
+	typedef DL_PrivateKey<T> ThisClass;
+
+public:
+	typedef T Element;
+
+	void MakePublicKey(DL_PublicKey<T> &pub) const
+	{
+		pub.AccessAbstractGroupParameters().AssignFrom(this->GetAbstractGroupParameters());
+		pub.SetPublicElement(this->GetAbstractGroupParameters().ExponentiateBase(GetPrivateExponent()));
+	}
+
+	bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+	{
+		return GetValueHelper(this, name, valueType, pValue, &this->GetAbstractGroupParameters())
+				CRYPTOPP_GET_FUNCTION_ENTRY(PrivateExponent);
+	}
+
+	void AssignFrom(const NameValuePairs &source)
+	{
+		this->AccessAbstractGroupParameters().AssignFrom(source);
+		AssignFromHelper(this, source)
+			CRYPTOPP_SET_FUNCTION_ENTRY(PrivateExponent);
+	}
+
+	virtual const Integer & GetPrivateExponent() const =0;
+	virtual void SetPrivateExponent(const Integer &x) =0;
+};
+
+template <class T>
+void DL_PublicKey<T>::AssignFrom(const NameValuePairs &source)
+{
+	DL_PrivateKey<T> *pPrivateKey = NULL;
+	if (source.GetThisPointer(pPrivateKey))
+		pPrivateKey->MakePublicKey(*this);
+	else
+	{
+		this->AccessAbstractGroupParameters().AssignFrom(source);
+		AssignFromHelper(this, source)
+			CRYPTOPP_SET_FUNCTION_ENTRY(PublicElement);
+	}
+}
+
+class OID;
+
+//! _
+template <class PK, class GP, class O = OID>
+class DL_KeyImpl : public PK
+{
+public:
+	typedef GP GroupParameters;
+
+	O GetAlgorithmID() const {return GetGroupParameters().GetAlgorithmID();}
+//	void BERDecode(BufferedTransformation &bt)
+//		{PK::BERDecode(bt);}
+//	void DEREncode(BufferedTransformation &bt) const
+//		{PK::DEREncode(bt);}
+	bool BERDecodeAlgorithmParameters(BufferedTransformation &bt)
+		{AccessGroupParameters().BERDecode(bt); return true;}
+	bool DEREncodeAlgorithmParameters(BufferedTransformation &bt) const
+		{GetGroupParameters().DEREncode(bt); return true;}
+
+	const GP & GetGroupParameters() const {return m_groupParameters;}
+	GP & AccessGroupParameters() {return m_groupParameters;}
+
+private:
+	GP m_groupParameters;
+};
+
+class X509PublicKey;
+class PKCS8PrivateKey;
+
+//! _
+template <class GP>
+class DL_PrivateKeyImpl : public DL_PrivateKey<CPP_TYPENAME GP::Element>, public DL_KeyImpl<PKCS8PrivateKey, GP>
+{
+public:
+	typedef typename GP::Element Element;
+
+	// GeneratableCryptoMaterial
+	bool Validate(RandomNumberGenerator &rng, unsigned int level) const
+	{
+		bool pass = GetAbstractGroupParameters().Validate(rng, level);
+
+		const Integer &q = GetAbstractGroupParameters().GetSubgroupOrder();
+		const Integer &x = GetPrivateExponent();
+
+		pass = pass && x.IsPositive() && x < q;
+		if (level >= 1)
+			pass = pass && Integer::Gcd(x, q) == Integer::One();
+		return pass;
+	}
+
+	bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+	{
+		return GetValueHelper<DL_PrivateKey<Element> >(this, name, valueType, pValue).Assignable();
+	}
+
+	void AssignFrom(const NameValuePairs &source)
+	{
+		AssignFromHelper<DL_PrivateKey<Element> >(this, source);
+	}
+
+	void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params)
+	{
+		if (!params.GetThisObject(this->AccessGroupParameters()))
+			this->AccessGroupParameters().GenerateRandom(rng, params);
+//		std::pair<const byte *, int> seed;
+		Integer x(rng, Integer::One(), GetAbstractGroupParameters().GetMaxExponent());
+//			Integer::ANY, Integer::Zero(), Integer::One(),
+//			params.GetValue("DeterministicKeyGenerationSeed", seed) ? &seed : NULL);
+		SetPrivateExponent(x);
+	}
+
+	bool SupportsPrecomputation() const {return true;}
+
+	void Precompute(unsigned int precomputationStorage=16)
+		{AccessAbstractGroupParameters().Precompute(precomputationStorage);}
+
+	void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
+		{AccessAbstractGroupParameters().LoadPrecomputation(storedPrecomputation);}
+
+	void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
+		{GetAbstractGroupParameters().SavePrecomputation(storedPrecomputation);}
+
+	// DL_Key
+	const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return this->GetGroupParameters();}
+	DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return this->AccessGroupParameters();}
+
+	// DL_PrivateKey
+	const Integer & GetPrivateExponent() const {return m_x;}
+	void SetPrivateExponent(const Integer &x) {m_x = x;}
+
+	// PKCS8PrivateKey
+	void BERDecodePrivateKey(BufferedTransformation &bt, bool, size_t)
+		{m_x.BERDecode(bt);}
+	void DEREncodePrivateKey(BufferedTransformation &bt) const
+		{m_x.DEREncode(bt);}
+
+private:
+	Integer m_x;
+};
+
+//! _
+template <class BASE, class SIGNATURE_SCHEME>
+class DL_PrivateKey_WithSignaturePairwiseConsistencyTest : public BASE
+{
+public:
+	void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params)
+	{
+		BASE::GenerateRandom(rng, params);
+
+		if (FIPS_140_2_ComplianceEnabled())
+		{
+			typename SIGNATURE_SCHEME::Signer signer(*this);
+			typename SIGNATURE_SCHEME::Verifier verifier(signer);
+			SignaturePairwiseConsistencyTest_FIPS_140_Only(signer, verifier);
+		}
+	}
+};
+
+//! _
+template <class GP>
+class DL_PublicKeyImpl : public DL_PublicKey<typename GP::Element>, public DL_KeyImpl<X509PublicKey, GP>
+{
+public:
+	typedef typename GP::Element Element;
+
+	// CryptoMaterial
+	bool Validate(RandomNumberGenerator &rng, unsigned int level) const
+	{
+		bool pass = GetAbstractGroupParameters().Validate(rng, level);
+		pass = pass && GetAbstractGroupParameters().ValidateElement(level, this->GetPublicElement(), &GetPublicPrecomputation());
+		return pass;
+	}
+
+	bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+	{
+		return GetValueHelper<DL_PublicKey<Element> >(this, name, valueType, pValue).Assignable();
+	}
+
+	void AssignFrom(const NameValuePairs &source)
+	{
+		AssignFromHelper<DL_PublicKey<Element> >(this, source);
+	}
+
+	bool SupportsPrecomputation() const {return true;}
+
+	void Precompute(unsigned int precomputationStorage=16)
+	{
+		AccessAbstractGroupParameters().Precompute(precomputationStorage);
+		AccessPublicPrecomputation().Precompute(GetAbstractGroupParameters().GetGroupPrecomputation(), GetAbstractGroupParameters().GetSubgroupOrder().BitCount(), precomputationStorage);
+	}
+
+	void LoadPrecomputation(BufferedTransformation &storedPrecomputation)
+	{
+		AccessAbstractGroupParameters().LoadPrecomputation(storedPrecomputation);
+		AccessPublicPrecomputation().Load(GetAbstractGroupParameters().GetGroupPrecomputation(), storedPrecomputation);
+	}
+
+	void SavePrecomputation(BufferedTransformation &storedPrecomputation) const
+	{
+		GetAbstractGroupParameters().SavePrecomputation(storedPrecomputation);
+		GetPublicPrecomputation().Save(GetAbstractGroupParameters().GetGroupPrecomputation(), storedPrecomputation);
+	}
+
+	// DL_Key
+	const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return this->GetGroupParameters();}
+	DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return this->AccessGroupParameters();}
+
+	// DL_PublicKey
+	const DL_FixedBasePrecomputation<Element> & GetPublicPrecomputation() const {return m_ypc;}
+	DL_FixedBasePrecomputation<Element> & AccessPublicPrecomputation() {return m_ypc;}
+
+	// non-inherited
+	bool operator==(const DL_PublicKeyImpl<GP> &rhs) const
+		{return this->GetGroupParameters() == rhs.GetGroupParameters() && this->GetPublicElement() == rhs.GetPublicElement();}
+
+private:
+	typename GP::BasePrecomputation m_ypc;
+};
+
+//! interface for Elgamal-like signature algorithms
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_ElgamalLikeSignatureAlgorithm
+{
+public:
+	virtual void Sign(const DL_GroupParameters<T> &params, const Integer &privateKey, const Integer &k, const Integer &e, Integer &r, Integer &s) const =0;
+	virtual bool Verify(const DL_GroupParameters<T> &params, const DL_PublicKey<T> &publicKey, const Integer &e, const Integer &r, const Integer &s) const =0;
+	virtual Integer RecoverPresignature(const DL_GroupParameters<T> &params, const DL_PublicKey<T> &publicKey, const Integer &r, const Integer &s) const
+		{throw NotImplemented("DL_ElgamalLikeSignatureAlgorithm: this signature scheme does not support message recovery");}
+	virtual size_t RLen(const DL_GroupParameters<T> &params) const
+		{return params.GetSubgroupOrder().ByteCount();}
+	virtual size_t SLen(const DL_GroupParameters<T> &params) const
+		{return params.GetSubgroupOrder().ByteCount();}
+};
+
+//! interface for DL key agreement algorithms
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_KeyAgreementAlgorithm
+{
+public:
+	typedef T Element;
+
+	virtual Element AgreeWithEphemeralPrivateKey(const DL_GroupParameters<Element> &params, const DL_FixedBasePrecomputation<Element> &publicPrecomputation, const Integer &privateExponent) const =0;
+	virtual Element AgreeWithStaticPrivateKey(const DL_GroupParameters<Element> &params, const Element &publicElement, bool validateOtherPublicKey, const Integer &privateExponent) const =0;
+};
+
+//! interface for key derivation algorithms used in DL cryptosystems
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_KeyDerivationAlgorithm
+{
+public:
+	virtual bool ParameterSupported(const char *name) const {return false;}
+	virtual void Derive(const DL_GroupParameters<T> &groupParams, byte *derivedKey, size_t derivedLength, const T &agreedElement, const T &ephemeralPublicKey, const NameValuePairs &derivationParams) const =0;
+};
+
+//! interface for symmetric encryption algorithms used in DL cryptosystems
+class CRYPTOPP_NO_VTABLE DL_SymmetricEncryptionAlgorithm
+{
+public:
+	virtual bool ParameterSupported(const char *name) const {return false;}
+	virtual size_t GetSymmetricKeyLength(size_t plaintextLength) const =0;
+	virtual size_t GetSymmetricCiphertextLength(size_t plaintextLength) const =0;
+	virtual size_t GetMaxSymmetricPlaintextLength(size_t ciphertextLength) const =0;
+	virtual void SymmetricEncrypt(RandomNumberGenerator &rng, const byte *key, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs &parameters) const =0;
+	virtual DecodingResult SymmetricDecrypt(const byte *key, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters) const =0;
+};
+
+//! _
+template <class KI>
+class CRYPTOPP_NO_VTABLE DL_Base
+{
+protected:
+	typedef KI KeyInterface;
+	typedef typename KI::Element Element;
+
+	const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return GetKeyInterface().GetAbstractGroupParameters();}
+	DL_GroupParameters<Element> & AccessAbstractGroupParameters() {return AccessKeyInterface().AccessAbstractGroupParameters();}
+
+	virtual KeyInterface & AccessKeyInterface() =0;
+	virtual const KeyInterface & GetKeyInterface() const =0;
+};
+
+//! _
+template <class INTERFACE, class KEY_INTERFACE>
+class CRYPTOPP_NO_VTABLE DL_SignatureSchemeBase : public INTERFACE, public DL_Base<KEY_INTERFACE>
+{
+public:
+	size_t SignatureLength() const
+	{
+		return GetSignatureAlgorithm().RLen(this->GetAbstractGroupParameters())
+			+ GetSignatureAlgorithm().SLen(this->GetAbstractGroupParameters());
+	}
+	size_t MaxRecoverableLength() const 
+		{return GetMessageEncodingInterface().MaxRecoverableLength(0, GetHashIdentifier().second, GetDigestSize());}
+	size_t MaxRecoverableLengthFromSignatureLength(size_t signatureLength) const
+		{assert(false); return 0;}	// TODO
+
+	bool IsProbabilistic() const 
+		{return true;}
+	bool AllowNonrecoverablePart() const 
+		{return GetMessageEncodingInterface().AllowNonrecoverablePart();}
+	bool RecoverablePartFirst() const 
+		{return GetMessageEncodingInterface().RecoverablePartFirst();}
+
+protected:
+	size_t MessageRepresentativeLength() const {return BitsToBytes(MessageRepresentativeBitLength());}
+	size_t MessageRepresentativeBitLength() const {return this->GetAbstractGroupParameters().GetSubgroupOrder().BitCount();}
+
+	virtual const DL_ElgamalLikeSignatureAlgorithm<CPP_TYPENAME KEY_INTERFACE::Element> & GetSignatureAlgorithm() const =0;
+	virtual const PK_SignatureMessageEncodingMethod & GetMessageEncodingInterface() const =0;
+	virtual HashIdentifier GetHashIdentifier() const =0;
+	virtual size_t GetDigestSize() const =0;
+};
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_SignerBase : public DL_SignatureSchemeBase<PK_Signer, DL_PrivateKey<T> >
+{
+public:
+	// for validation testing
+	void RawSign(const Integer &k, const Integer &e, Integer &r, Integer &s) const
+	{
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		const DL_PrivateKey<T> &key = this->GetKeyInterface();
+
+		r = params.ConvertElementToInteger(params.ExponentiateBase(k));
+		alg.Sign(params, key.GetPrivateExponent(), k, e, r, s);
+	}
+
+	void InputRecoverableMessage(PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const
+	{
+		PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
+		ma.m_recoverableMessage.Assign(recoverableMessage, recoverableMessageLength);
+		this->GetMessageEncodingInterface().ProcessRecoverableMessage(ma.AccessHash(), 
+			recoverableMessage, recoverableMessageLength, 
+			ma.m_presignature, ma.m_presignature.size(),
+			ma.m_semisignature);
+	}
+
+	size_t SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const
+	{
+		this->GetMaterial().DoQuickSanityCheck();
+
+		PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		const DL_PrivateKey<T> &key = this->GetKeyInterface();
+
+		SecByteBlock representative(this->MessageRepresentativeLength());
+		this->GetMessageEncodingInterface().ComputeMessageRepresentative(
+			rng, 
+			ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
+			ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty, 
+			representative, this->MessageRepresentativeBitLength());
+		ma.m_empty = true;
+		Integer e(representative, representative.size());
+
+		// hash message digest into random number k to prevent reusing the same k on a different messages
+		// after virtual machine rollback
+		if (rng.CanIncorporateEntropy())
+			rng.IncorporateEntropy(representative, representative.size());
+		Integer k(rng, 1, params.GetSubgroupOrder()-1);
+		Integer r, s;
+		r = params.ConvertElementToInteger(params.ExponentiateBase(k));
+		alg.Sign(params, key.GetPrivateExponent(), k, e, r, s);
+
+		/*
+		Integer r, s;
+		if (this->MaxRecoverableLength() > 0)
+			r.Decode(ma.m_semisignature, ma.m_semisignature.size());
+		else
+			r.Decode(ma.m_presignature, ma.m_presignature.size());
+		alg.Sign(params, key.GetPrivateExponent(), ma.m_k, e, r, s);
+		*/
+
+		size_t rLen = alg.RLen(params);
+		r.Encode(signature, rLen);
+		s.Encode(signature+rLen, alg.SLen(params));
+
+		if (restart)
+			RestartMessageAccumulator(rng, ma);
+
+		return this->SignatureLength();
+	}
+
+protected:
+	void RestartMessageAccumulator(RandomNumberGenerator &rng, PK_MessageAccumulatorBase &ma) const
+	{
+		// k needs to be generated before hashing for signature schemes with recovery
+		// but to defend against VM rollbacks we need to generate k after hashing.
+		// so this code is commented out, since no DL-based signature scheme with recovery
+		// has been implemented in Crypto++ anyway
+		/*
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		ma.m_k.Randomize(rng, 1, params.GetSubgroupOrder()-1);
+		ma.m_presignature.New(params.GetEncodedElementSize(false));
+		params.ConvertElementToInteger(params.ExponentiateBase(ma.m_k)).Encode(ma.m_presignature, ma.m_presignature.size());
+		*/
+	}
+};
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_VerifierBase : public DL_SignatureSchemeBase<PK_Verifier, DL_PublicKey<T> >
+{
+public:
+	void InputSignature(PK_MessageAccumulator &messageAccumulator, const byte *signature, size_t signatureLength) const
+	{
+		PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+
+		size_t rLen = alg.RLen(params);
+		ma.m_semisignature.Assign(signature, rLen);
+		ma.m_s.Decode(signature+rLen, alg.SLen(params));
+
+		this->GetMessageEncodingInterface().ProcessSemisignature(ma.AccessHash(), ma.m_semisignature, ma.m_semisignature.size());
+	}
+	
+	bool VerifyAndRestart(PK_MessageAccumulator &messageAccumulator) const
+	{
+		this->GetMaterial().DoQuickSanityCheck();
+
+		PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		const DL_PublicKey<T> &key = this->GetKeyInterface();
+
+		SecByteBlock representative(this->MessageRepresentativeLength());
+		this->GetMessageEncodingInterface().ComputeMessageRepresentative(NullRNG(), ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
+			ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty,
+			representative, this->MessageRepresentativeBitLength());
+		ma.m_empty = true;
+		Integer e(representative, representative.size());
+
+		Integer r(ma.m_semisignature, ma.m_semisignature.size());
+		return alg.Verify(params, key, e, r, ma.m_s);
+	}
+
+	DecodingResult RecoverAndRestart(byte *recoveredMessage, PK_MessageAccumulator &messageAccumulator) const
+	{
+		this->GetMaterial().DoQuickSanityCheck();
+
+		PK_MessageAccumulatorBase &ma = static_cast<PK_MessageAccumulatorBase &>(messageAccumulator);
+		const DL_ElgamalLikeSignatureAlgorithm<T> &alg = this->GetSignatureAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		const DL_PublicKey<T> &key = this->GetKeyInterface();
+
+		SecByteBlock representative(this->MessageRepresentativeLength());
+		this->GetMessageEncodingInterface().ComputeMessageRepresentative(
+			NullRNG(), 
+			ma.m_recoverableMessage, ma.m_recoverableMessage.size(), 
+			ma.AccessHash(), this->GetHashIdentifier(), ma.m_empty,
+			representative, this->MessageRepresentativeBitLength());
+		ma.m_empty = true;
+		Integer e(representative, representative.size());
+
+		ma.m_presignature.New(params.GetEncodedElementSize(false));
+		Integer r(ma.m_semisignature, ma.m_semisignature.size());
+		alg.RecoverPresignature(params, key, r, ma.m_s).Encode(ma.m_presignature, ma.m_presignature.size());
+
+		return this->GetMessageEncodingInterface().RecoverMessageFromSemisignature(
+			ma.AccessHash(), this->GetHashIdentifier(),
+			ma.m_presignature, ma.m_presignature.size(),
+			ma.m_semisignature, ma.m_semisignature.size(),
+			recoveredMessage);
+	}
+};
+
+//! _
+template <class PK, class KI>
+class CRYPTOPP_NO_VTABLE DL_CryptoSystemBase : public PK, public DL_Base<KI>
+{
+public:
+	typedef typename DL_Base<KI>::Element Element;
+
+	size_t MaxPlaintextLength(size_t ciphertextLength) const
+	{
+		unsigned int minLen = this->GetAbstractGroupParameters().GetEncodedElementSize(true);
+		return ciphertextLength < minLen ? 0 : GetSymmetricEncryptionAlgorithm().GetMaxSymmetricPlaintextLength(ciphertextLength - minLen);
+	}
+
+	size_t CiphertextLength(size_t plaintextLength) const
+	{
+		size_t len = GetSymmetricEncryptionAlgorithm().GetSymmetricCiphertextLength(plaintextLength);
+		return len == 0 ? 0 : this->GetAbstractGroupParameters().GetEncodedElementSize(true) + len;
+	}
+
+	bool ParameterSupported(const char *name) const
+		{return GetKeyDerivationAlgorithm().ParameterSupported(name) || GetSymmetricEncryptionAlgorithm().ParameterSupported(name);}
+
+protected:
+	virtual const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const =0;
+	virtual const DL_KeyDerivationAlgorithm<Element> & GetKeyDerivationAlgorithm() const =0;
+	virtual const DL_SymmetricEncryptionAlgorithm & GetSymmetricEncryptionAlgorithm() const =0;
+};
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_DecryptorBase : public DL_CryptoSystemBase<PK_Decryptor, DL_PrivateKey<T> >
+{
+public:
+	typedef T Element;
+
+	DecodingResult Decrypt(RandomNumberGenerator &rng, const byte *ciphertext, size_t ciphertextLength, byte *plaintext, const NameValuePairs &parameters = g_nullNameValuePairs) const
+	{
+		try
+		{
+			const DL_KeyAgreementAlgorithm<T> &agreeAlg = this->GetKeyAgreementAlgorithm();
+			const DL_KeyDerivationAlgorithm<T> &derivAlg = this->GetKeyDerivationAlgorithm();
+			const DL_SymmetricEncryptionAlgorithm &encAlg = this->GetSymmetricEncryptionAlgorithm();
+			const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+			const DL_PrivateKey<T> &key = this->GetKeyInterface();
+
+			Element q = params.DecodeElement(ciphertext, true);
+			size_t elementSize = params.GetEncodedElementSize(true);
+			ciphertext += elementSize;
+			ciphertextLength -= elementSize;
+
+			Element z = agreeAlg.AgreeWithStaticPrivateKey(params, q, true, key.GetPrivateExponent());
+
+			SecByteBlock derivedKey(encAlg.GetSymmetricKeyLength(encAlg.GetMaxSymmetricPlaintextLength(ciphertextLength)));
+			derivAlg.Derive(params, derivedKey, derivedKey.size(), z, q, parameters);
+
+			return encAlg.SymmetricDecrypt(derivedKey, ciphertext, ciphertextLength, plaintext, parameters);
+		}
+		catch (DL_BadElement &)
+		{
+			return DecodingResult();
+		}
+	}
+};
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_EncryptorBase : public DL_CryptoSystemBase<PK_Encryptor, DL_PublicKey<T> >
+{
+public:
+	typedef T Element;
+
+	void Encrypt(RandomNumberGenerator &rng, const byte *plaintext, size_t plaintextLength, byte *ciphertext, const NameValuePairs &parameters = g_nullNameValuePairs) const
+	{
+		const DL_KeyAgreementAlgorithm<T> &agreeAlg = this->GetKeyAgreementAlgorithm();
+		const DL_KeyDerivationAlgorithm<T> &derivAlg = this->GetKeyDerivationAlgorithm();
+		const DL_SymmetricEncryptionAlgorithm &encAlg = this->GetSymmetricEncryptionAlgorithm();
+		const DL_GroupParameters<T> &params = this->GetAbstractGroupParameters();
+		const DL_PublicKey<T> &key = this->GetKeyInterface();
+
+		Integer x(rng, Integer::One(), params.GetMaxExponent());
+		Element q = params.ExponentiateBase(x);
+		params.EncodeElement(true, q, ciphertext);
+		unsigned int elementSize = params.GetEncodedElementSize(true);
+		ciphertext += elementSize;
+
+		Element z = agreeAlg.AgreeWithEphemeralPrivateKey(params, key.GetPublicPrecomputation(), x);
+
+		SecByteBlock derivedKey(encAlg.GetSymmetricKeyLength(plaintextLength));
+		derivAlg.Derive(params, derivedKey, derivedKey.size(), z, q, parameters);
+
+		encAlg.SymmetricEncrypt(rng, derivedKey, plaintext, plaintextLength, ciphertext, parameters);
+	}
+};
+
+//! _
+template <class T1, class T2>
+struct DL_SchemeOptionsBase
+{
+	typedef T1 AlgorithmInfo;
+	typedef T2 GroupParameters;
+	typedef typename GroupParameters::Element Element;
+};
+
+//! _
+template <class T1, class T2>
+struct DL_KeyedSchemeOptions : public DL_SchemeOptionsBase<T1, typename T2::PublicKey::GroupParameters>
+{
+	typedef T2 Keys;
+	typedef typename Keys::PrivateKey PrivateKey;
+	typedef typename Keys::PublicKey PublicKey;
+};
+
+//! _
+template <class T1, class T2, class T3, class T4, class T5>
+struct DL_SignatureSchemeOptions : public DL_KeyedSchemeOptions<T1, T2>
+{
+	typedef T3 SignatureAlgorithm;
+	typedef T4 MessageEncodingMethod;
+	typedef T5 HashFunction;
+};
+
+//! _
+template <class T1, class T2, class T3, class T4, class T5>
+struct DL_CryptoSchemeOptions : public DL_KeyedSchemeOptions<T1, T2>
+{
+	typedef T3 KeyAgreementAlgorithm;
+	typedef T4 KeyDerivationAlgorithm;
+	typedef T5 SymmetricEncryptionAlgorithm;
+};
+
+//! _
+template <class BASE, class SCHEME_OPTIONS, class KEY>
+class CRYPTOPP_NO_VTABLE DL_ObjectImplBase : public AlgorithmImpl<BASE, typename SCHEME_OPTIONS::AlgorithmInfo>
+{
+public:
+	typedef SCHEME_OPTIONS SchemeOptions;
+	typedef typename KEY::Element Element;
+
+	PrivateKey & AccessPrivateKey() {return m_key;}
+	PublicKey & AccessPublicKey() {return m_key;}
+
+	// KeyAccessor
+	const KEY & GetKey() const {return m_key;}
+	KEY & AccessKey() {return m_key;}
+
+protected:
+	typename BASE::KeyInterface & AccessKeyInterface() {return m_key;}
+	const typename BASE::KeyInterface & GetKeyInterface() const {return m_key;}
+
+	// for signature scheme
+	HashIdentifier GetHashIdentifier() const
+	{
+		typedef typename SchemeOptions::MessageEncodingMethod::HashIdentifierLookup HashLookup;
+		return HashLookup::template HashIdentifierLookup2<CPP_TYPENAME SchemeOptions::HashFunction>::Lookup();
+	}
+	size_t GetDigestSize() const
+	{
+		typedef CPP_TYPENAME SchemeOptions::HashFunction H;
+		return H::DIGESTSIZE;
+	}
+
+private:
+	KEY m_key;
+};
+
+//! _
+template <class BASE, class SCHEME_OPTIONS, class KEY>
+class CRYPTOPP_NO_VTABLE DL_ObjectImpl : public DL_ObjectImplBase<BASE, SCHEME_OPTIONS, KEY>
+{
+public:
+	typedef typename KEY::Element Element;
+
+protected:
+	const DL_ElgamalLikeSignatureAlgorithm<Element> & GetSignatureAlgorithm() const
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::SignatureAlgorithm>().Ref();}
+	const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::KeyAgreementAlgorithm>().Ref();}
+	const DL_KeyDerivationAlgorithm<Element> & GetKeyDerivationAlgorithm() const
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::KeyDerivationAlgorithm>().Ref();}
+	const DL_SymmetricEncryptionAlgorithm & GetSymmetricEncryptionAlgorithm() const
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::SymmetricEncryptionAlgorithm>().Ref();}
+	HashIdentifier GetHashIdentifier() const
+		{return HashIdentifier();}
+	const PK_SignatureMessageEncodingMethod & GetMessageEncodingInterface() const 
+		{return Singleton<CPP_TYPENAME SCHEME_OPTIONS::MessageEncodingMethod>().Ref();}
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class DL_SignerImpl : public DL_ObjectImpl<DL_SignerBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
+{
+public:
+	PK_MessageAccumulator * NewSignatureAccumulator(RandomNumberGenerator &rng) const
+	{
+		std::auto_ptr<PK_MessageAccumulatorBase> p(new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>);
+		this->RestartMessageAccumulator(rng, *p);
+		return p.release();
+	}
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class DL_VerifierImpl : public DL_ObjectImpl<DL_VerifierBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
+{
+public:
+	PK_MessageAccumulator * NewVerificationAccumulator() const
+	{
+		return new PK_MessageAccumulatorImpl<CPP_TYPENAME SCHEME_OPTIONS::HashFunction>;
+	}
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class DL_EncryptorImpl : public DL_ObjectImpl<DL_EncryptorBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PublicKey>
+{
+};
+
+//! _
+template <class SCHEME_OPTIONS>
+class DL_DecryptorImpl : public DL_ObjectImpl<DL_DecryptorBase<typename SCHEME_OPTIONS::Element>, SCHEME_OPTIONS, typename SCHEME_OPTIONS::PrivateKey>
+{
+};
+
+// ********************************************************
+
+//! _
+template <class T>
+class CRYPTOPP_NO_VTABLE DL_SimpleKeyAgreementDomainBase : public SimpleKeyAgreementDomain
+{
+public:
+	typedef T Element;
+
+	CryptoParameters & AccessCryptoParameters() {return AccessAbstractGroupParameters();}
+	unsigned int AgreedValueLength() const {return GetAbstractGroupParameters().GetEncodedElementSize(false);}
+	unsigned int PrivateKeyLength() const {return GetAbstractGroupParameters().GetSubgroupOrder().ByteCount();}
+	unsigned int PublicKeyLength() const {return GetAbstractGroupParameters().GetEncodedElementSize(true);}
+
+	void GeneratePrivateKey(RandomNumberGenerator &rng, byte *privateKey) const
+	{
+		Integer x(rng, Integer::One(), GetAbstractGroupParameters().GetMaxExponent());
+		x.Encode(privateKey, PrivateKeyLength());
+	}
+
+	void GeneratePublicKey(RandomNumberGenerator &rng, const byte *privateKey, byte *publicKey) const
+	{
+		const DL_GroupParameters<T> &params = GetAbstractGroupParameters();
+		Integer x(privateKey, PrivateKeyLength());
+		Element y = params.ExponentiateBase(x);
+		params.EncodeElement(true, y, publicKey);
+	}
+	
+	bool Agree(byte *agreedValue, const byte *privateKey, const byte *otherPublicKey, bool validateOtherPublicKey=true) const
+	{
+		try
+		{
+			const DL_GroupParameters<T> &params = GetAbstractGroupParameters();
+			Integer x(privateKey, PrivateKeyLength());
+			Element w = params.DecodeElement(otherPublicKey, validateOtherPublicKey);
+
+			Element z = GetKeyAgreementAlgorithm().AgreeWithStaticPrivateKey(
+				GetAbstractGroupParameters(), w, validateOtherPublicKey, x);
+			params.EncodeElement(false, z, agreedValue);
+		}
+		catch (DL_BadElement &)
+		{
+			return false;
+		}
+		return true;
+	}
+
+	const Element &GetGenerator() const {return GetAbstractGroupParameters().GetSubgroupGenerator();}
+
+protected:
+	virtual const DL_KeyAgreementAlgorithm<Element> & GetKeyAgreementAlgorithm() const =0;
+	virtual DL_GroupParameters<Element> & AccessAbstractGroupParameters() =0;
+	const DL_GroupParameters<Element> & GetAbstractGroupParameters() const {return const_cast<DL_SimpleKeyAgreementDomainBase<Element> *>(this)->AccessAbstractGroupParameters();}
+};
+
+enum CofactorMultiplicationOption {NO_COFACTOR_MULTIPLICTION, COMPATIBLE_COFACTOR_MULTIPLICTION, INCOMPATIBLE_COFACTOR_MULTIPLICTION};
+typedef EnumToType<CofactorMultiplicationOption, NO_COFACTOR_MULTIPLICTION> NoCofactorMultiplication;
+typedef EnumToType<CofactorMultiplicationOption, COMPATIBLE_COFACTOR_MULTIPLICTION> CompatibleCofactorMultiplication;
+typedef EnumToType<CofactorMultiplicationOption, INCOMPATIBLE_COFACTOR_MULTIPLICTION> IncompatibleCofactorMultiplication;
+
+//! DH key agreement algorithm
+template <class ELEMENT, class COFACTOR_OPTION>
+class DL_KeyAgreementAlgorithm_DH : public DL_KeyAgreementAlgorithm<ELEMENT>
+{
+public:
+	typedef ELEMENT Element;
+
+	static const char * CRYPTOPP_API StaticAlgorithmName()
+		{return COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION ? "DHC" : "DH";}
+
+	Element AgreeWithEphemeralPrivateKey(const DL_GroupParameters<Element> &params, const DL_FixedBasePrecomputation<Element> &publicPrecomputation, const Integer &privateExponent) const
+	{
+		return publicPrecomputation.Exponentiate(params.GetGroupPrecomputation(), 
+			COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION ? privateExponent*params.GetCofactor() : privateExponent);
+	}
+
+	Element AgreeWithStaticPrivateKey(const DL_GroupParameters<Element> &params, const Element &publicElement, bool validateOtherPublicKey, const Integer &privateExponent) const
+	{
+		if (COFACTOR_OPTION::ToEnum() == COMPATIBLE_COFACTOR_MULTIPLICTION)
+		{
+			const Integer &k = params.GetCofactor();
+			return params.ExponentiateElement(publicElement, 
+				ModularArithmetic(params.GetSubgroupOrder()).Divide(privateExponent, k)*k);
+		}
+		else if (COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION)
+			return params.ExponentiateElement(publicElement, privateExponent*params.GetCofactor());
+		else
+		{
+			assert(COFACTOR_OPTION::ToEnum() == NO_COFACTOR_MULTIPLICTION);
+
+			if (!validateOtherPublicKey)
+				return params.ExponentiateElement(publicElement, privateExponent);
+
+			if (params.FastSubgroupCheckAvailable())
+			{
+				if (!params.ValidateElement(2, publicElement, NULL))
+					throw DL_BadElement();
+				return params.ExponentiateElement(publicElement, privateExponent);
+			}
+			else
+			{
+				const Integer e[2] = {params.GetSubgroupOrder(), privateExponent};
+				Element r[2];
+				params.SimultaneousExponentiate(r, publicElement, e, 2);
+				if (!params.IsIdentity(r[0]))
+					throw DL_BadElement();
+				return r[1];
+			}
+		}
+	}
+};
+
+// ********************************************************
+
+//! A template implementing constructors for public key algorithm classes
+template <class BASE>
+class CRYPTOPP_NO_VTABLE PK_FinalTemplate : public BASE
+{
+public:
+	PK_FinalTemplate() {}
+
+	PK_FinalTemplate(const CryptoMaterial &key)
+		{this->AccessKey().AssignFrom(key);}
+
+	PK_FinalTemplate(BufferedTransformation &bt)
+		{this->AccessKey().BERDecode(bt);}
+
+	PK_FinalTemplate(const AsymmetricAlgorithm &algorithm)
+		{this->AccessKey().AssignFrom(algorithm.GetMaterial());}
+
+	PK_FinalTemplate(const Integer &v1)
+		{this->AccessKey().Initialize(v1);}
+
+#if (defined(_MSC_VER) && _MSC_VER < 1300)
+
+	template <class T1, class T2>
+	PK_FinalTemplate(T1 &v1, T2 &v2)
+		{this->AccessKey().Initialize(v1, v2);}
+
+	template <class T1, class T2, class T3>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3)
+		{this->AccessKey().Initialize(v1, v2, v3);}
+	
+	template <class T1, class T2, class T3, class T4>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4)
+		{this->AccessKey().Initialize(v1, v2, v3, v4);}
+
+	template <class T1, class T2, class T3, class T4, class T5>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6, T7 &v7)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
+	PK_FinalTemplate(T1 &v1, T2 &v2, T3 &v3, T4 &v4, T5 &v5, T6 &v6, T7 &v7, T8 &v8)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
+
+#else
+
+	template <class T1, class T2>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2)
+		{this->AccessKey().Initialize(v1, v2);}
+
+	template <class T1, class T2, class T3>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3)
+		{this->AccessKey().Initialize(v1, v2, v3);}
+	
+	template <class T1, class T2, class T3, class T4>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4)
+		{this->AccessKey().Initialize(v1, v2, v3, v4);}
+
+	template <class T1, class T2, class T3, class T4, class T5>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
+	PK_FinalTemplate(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7, const T8 &v8)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
+
+	template <class T1, class T2>
+	PK_FinalTemplate(T1 &v1, const T2 &v2)
+		{this->AccessKey().Initialize(v1, v2);}
+
+	template <class T1, class T2, class T3>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3)
+		{this->AccessKey().Initialize(v1, v2, v3);}
+	
+	template <class T1, class T2, class T3, class T4>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4)
+		{this->AccessKey().Initialize(v1, v2, v3, v4);}
+
+	template <class T1, class T2, class T3, class T4, class T5>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7);}
+
+	template <class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
+	PK_FinalTemplate(T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5, const T6 &v6, const T7 &v7, const T8 &v8)
+		{this->AccessKey().Initialize(v1, v2, v3, v4, v5, v6, v7, v8);}
+
+#endif
+};
+
+//! Base class for public key encryption standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
+struct EncryptionStandard {};
+
+//! Base class for public key signature standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
+struct SignatureStandard {};
+
+template <class STANDARD, class KEYS, class ALG_INFO>
+class TF_ES;
+
+//! Trapdoor Function Based Encryption Scheme
+template <class STANDARD, class KEYS, class ALG_INFO = TF_ES<STANDARD, KEYS, int> >
+class TF_ES : public KEYS
+{
+	typedef typename STANDARD::EncryptionMessageEncodingMethod MessageEncodingMethod;
+
+public:
+	//! see EncryptionStandard for a list of standards
+	typedef STANDARD Standard;
+	typedef TF_CryptoSchemeOptions<ALG_INFO, KEYS, MessageEncodingMethod> SchemeOptions;
+
+	static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(KEYS::StaticAlgorithmName()) + "/" + MessageEncodingMethod::StaticAlgorithmName();}
+
+	//! implements PK_Decryptor interface
+	typedef PK_FinalTemplate<TF_DecryptorImpl<SchemeOptions> > Decryptor;
+	//! implements PK_Encryptor interface
+	typedef PK_FinalTemplate<TF_EncryptorImpl<SchemeOptions> > Encryptor;
+};
+
+template <class STANDARD, class H, class KEYS, class ALG_INFO>	// VC60 workaround: doesn't work if KEYS is first parameter
+class TF_SS;
+
+//! Trapdoor Function Based Signature Scheme
+template <class STANDARD, class H, class KEYS, class ALG_INFO = TF_SS<STANDARD, H, KEYS, int> >	// VC60 workaround: doesn't work if KEYS is first parameter
+class TF_SS : public KEYS
+{
+public:
+	//! see SignatureStandard for a list of standards
+	typedef STANDARD Standard;
+	typedef typename Standard::SignatureMessageEncodingMethod MessageEncodingMethod;
+	typedef TF_SignatureSchemeOptions<ALG_INFO, KEYS, MessageEncodingMethod, H> SchemeOptions;
+
+	static std::string CRYPTOPP_API StaticAlgorithmName() {return std::string(KEYS::StaticAlgorithmName()) + "/" + MessageEncodingMethod::StaticAlgorithmName() + "(" + H::StaticAlgorithmName() + ")";}
+
+	//! implements PK_Signer interface
+	typedef PK_FinalTemplate<TF_SignerImpl<SchemeOptions> > Signer;
+	//! implements PK_Verifier interface
+	typedef PK_FinalTemplate<TF_VerifierImpl<SchemeOptions> > Verifier;
+};
+
+template <class KEYS, class SA, class MEM, class H, class ALG_INFO>
+class DL_SS;
+
+//! Discrete Log Based Signature Scheme
+template <class KEYS, class SA, class MEM, class H, class ALG_INFO = DL_SS<KEYS, SA, MEM, H, int> >
+class DL_SS : public KEYS
+{
+	typedef DL_SignatureSchemeOptions<ALG_INFO, KEYS, SA, MEM, H> SchemeOptions;
+
+public:
+	static std::string StaticAlgorithmName() {return SA::StaticAlgorithmName() + std::string("/EMSA1(") + H::StaticAlgorithmName() + ")";}
+
+	//! implements PK_Signer interface
+	typedef PK_FinalTemplate<DL_SignerImpl<SchemeOptions> > Signer;
+	//! implements PK_Verifier interface
+	typedef PK_FinalTemplate<DL_VerifierImpl<SchemeOptions> > Verifier;
+};
+
+//! Discrete Log Based Encryption Scheme
+template <class KEYS, class AA, class DA, class EA, class ALG_INFO>
+class DL_ES : public KEYS
+{
+	typedef DL_CryptoSchemeOptions<ALG_INFO, KEYS, AA, DA, EA> SchemeOptions;
+
+public:
+	//! implements PK_Decryptor interface
+	typedef PK_FinalTemplate<DL_DecryptorImpl<SchemeOptions> > Decryptor;
+	//! implements PK_Encryptor interface
+	typedef PK_FinalTemplate<DL_EncryptorImpl<SchemeOptions> > Encryptor;
+};
+
+NAMESPACE_END
+
+#endif