modes.h

研读AxCrypt对加解密的处理方法

	void UncheckedSetKey(const NameValuePairs &params, const byte *key, unsigned int length, const byte *iv)
	{
		CBC_Encryption::UncheckedSetKey(params, key, length, iv);
		m_stolenIV = params.GetValueWithDefault(Name::StolenIV(), (byte *)NULL);
	}

	byte *m_stolenIV;
};

class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Decryption : public CBC_ModeBase
{
public:
	void ProcessBlocks(byte *outString, const byte *inString, unsigned int numberOfBlocks);
	
protected:
	void ResizeBuffers()
	{
		BlockOrientedCipherModeBase::ResizeBuffers();
		m_temp.New(BlockSize());
	}
	SecByteBlock m_temp;
};

class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Decryption : public CBC_Decryption
{
public:
	unsigned int MinLastBlockSize() const {return BlockSize()+1;}
	void ProcessLastBlock(byte *outString, const byte *inString, unsigned int length);
};

//! _
template <class CIPHER, class BASE>
class CipherModeFinalTemplate_CipherHolder : protected ObjectHolder<CIPHER>, public AlgorithmImpl<BASE, CipherModeFinalTemplate_CipherHolder<CIPHER, BASE> >
{
public:
	CipherModeFinalTemplate_CipherHolder()
	{
		this->m_cipher = &this->m_object;
		this->ResizeBuffers();
	}
	CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length)
	{
		this->m_cipher = &this->m_object;
		this->SetKey(key, length);
	}
	CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length, const byte *iv)
	{
		this->m_cipher = &this->m_object;
		this->SetKey(key, length, MakeParameters(Name::IV(), iv));
	}
	CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length, const byte *iv, int feedbackSize)
	{
		this->m_cipher = &this->m_object;
		this->SetKey(key, length, MakeParameters(Name::IV(), iv)(Name::FeedbackSize(), feedbackSize));
	}

	static std::string StaticAlgorithmName()
		{return CIPHER::StaticAlgorithmName() + "/" + BASE::StaticAlgorithmName();}
};

//! _
template <class BASE>
class CipherModeFinalTemplate_ExternalCipher : public BASE
{
public:
	CipherModeFinalTemplate_ExternalCipher() {}
	CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher)
		{SetCipher(cipher);}
	CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
		{SetCipherWithIV(cipher, iv, feedbackSize);}

	void SetCipher(BlockCipher &cipher);
	void SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize = 0);
};

template <class BASE>
void CipherModeFinalTemplate_ExternalCipher<BASE>::SetCipher(BlockCipher &cipher)
{
	this->ThrowIfResynchronizable();
	this->m_cipher = &cipher;
	this->ResizeBuffers();
}

template <class BASE>
void CipherModeFinalTemplate_ExternalCipher<BASE>::SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize)
{
	this->ThrowIfInvalidIV(iv);
	this->m_cipher = &cipher;
	this->ResizeBuffers();
	this->SetFeedbackSize(feedbackSize);
	if (this->IsResynchronizable())
		this->Resynchronize(iv);
}

CRYPTOPP_DLL_TEMPLATE_CLASS CFB_CipherTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
CRYPTOPP_DLL_TEMPLATE_CLASS CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
CRYPTOPP_DLL_TEMPLATE_CLASS CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;

//! CFB mode
template <class CIPHER>
struct CFB_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
};

//! CFB mode, external cipher
struct CFB_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
};

//! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A
template <class CIPHER>
struct CFB_FIPS_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
};

//! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A, external cipher
struct CFB_FIPS_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
};

CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> >;

//! OFB mode
template <class CIPHER>
struct OFB_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
	typedef Encryption Decryption;
};

//! OFB mode, external cipher
struct OFB_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
	typedef Encryption Decryption;
};

CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> >;

//! CTR mode
template <class CIPHER>
struct CTR_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
	typedef Encryption Decryption;
};

//! CTR mode, external cipher
struct CTR_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
	typedef Encryption Decryption;
};

//! ECB mode
template <class CIPHER>
struct ECB_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ECB_OneWay> Encryption;
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, ECB_OneWay> Decryption;
};

CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ECB_OneWay>;

//! ECB mode, external cipher
struct ECB_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<ECB_OneWay> Encryption;
	typedef Encryption Decryption;
};

//! CBC mode
template <class CIPHER>
struct CBC_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_Encryption> Encryption;
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_Decryption> Decryption;
};

CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Encryption>;
CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Decryption>;

//! CBC mode, external cipher
struct CBC_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<CBC_Encryption> Encryption;
	typedef CipherModeFinalTemplate_ExternalCipher<CBC_Decryption> Decryption;
};

//! CBC mode with ciphertext stealing
template <class CIPHER>
struct CBC_CTS_Mode : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_CTS_Encryption> Encryption;
	typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_CTS_Decryption> Decryption;
};

CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption>;
CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption>;

//! CBC mode with ciphertext stealing, external cipher
struct CBC_CTS_Mode_ExternalCipher : public CipherModeDocumentation
{
	typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption> Encryption;
	typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption> Decryption;
};

#ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY
typedef CFB_Mode_ExternalCipher::Encryption CFBEncryption;
typedef CFB_Mode_ExternalCipher::Decryption CFBDecryption;
typedef OFB_Mode_ExternalCipher::Encryption OFB;
typedef CTR_Mode_ExternalCipher::Encryption CounterMode;
#endif

NAMESPACE_END

#endif