pubkey.h

研读AxCrypt对加解密的处理方法

	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 BERDecodeKey(BufferedTransformation &bt)
		{m_x.BERDecode(bt);}
	void DEREncodeKey(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 unsigned int RLen(const DL_GroupParameters<T> &params) const
		{return params.GetSubgroupOrder().ByteCount();}
	virtual unsigned int 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, unsigned int 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 unsigned int GetSymmetricKeyLength(unsigned int plaintextLength) const =0;
	virtual unsigned int GetSymmetricCiphertextLength(unsigned int plaintextLength) const =0;
	virtual unsigned int GetMaxSymmetricPlaintextLength(unsigned int ciphertextLength) const =0;
	virtual void SymmetricEncrypt(RandomNumberGenerator &rng, const byte *key, const byte *plaintext, unsigned int plaintextLength, byte *ciphertext, const NameValuePairs &parameters) const =0;
	virtual DecodingResult SymmetricDecrypt(const byte *key, const byte *ciphertext, unsigned int 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:
	unsigned int SignatureLength() const
	{
		return GetSignatureAlgorithm().RLen(this->GetAbstractGroupParameters())
			+ GetSignatureAlgorithm().SLen(this->GetAbstractGroupParameters());
	}
	unsigned int MaxRecoverableLength() const 
		{return GetMessageEncodingInterface().MaxRecoverableLength(0, GetHashIdentifier().second, GetDigestSize());}
	unsigned int MaxRecoverableLengthFromSignatureLength(unsigned int signatureLength) const
		{assert(false); return 0;}	// TODO

	bool IsProbabilistic() const 
		{return true;}