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#ifndef CRYPTOPP_AUTHENC_H
#define CRYPTOPP_AUTHENC_H
#include "cryptlib.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! .
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
{
public:
AuthenticatedSymmetricCipherBase() : m_state(State_Start) {}
bool IsRandomAccess() const {return false;}
bool IsSelfInverting() const {return true;}
void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
void SetKey(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
void Resynchronize(const byte *iv, int length=-1);
void Update(const byte *input, size_t length);
void ProcessData(byte *outString, const byte *inString, size_t length);
void TruncatedFinal(byte *mac, size_t macSize);
protected:
void AuthenticateData(const byte *data, size_t len);
const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
virtual SymmetricCipher & AccessSymmetricCipher() =0;
virtual bool AuthenticationIsOnPlaintext() const =0;
virtual unsigned int AuthenticationBlockSize() const =0;
virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms) =0;
virtual void Resync(const byte *iv, size_t len) =0;
virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
virtual void AuthenticateLastHeaderBlock() =0;
virtual void AuthenticateLastConfidentialBlock() {}
virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
State m_state;
unsigned int m_bufferedDataLength;
lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
AlignedSecByteBlock m_buffer;
};
NAMESPACE_END
#endif
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