1#ifndef CRYPTOPP_AUTHENC_H 2#define CRYPTOPP_AUTHENC_H 3 4#include "cryptlib.h" 5#include "secblock.h" 6 7NAMESPACE_BEGIN(CryptoPP) 8 9//! . 10class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher 11{ 12public: 13 AuthenticatedSymmetricCipherBase() : m_state(State_Start) {} 14 15 bool IsRandomAccess() const {return false;} 16 bool IsSelfInverting() const {return true;} 17 void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);} 18 19 void SetKey(const byte *userKey, size_t keylength, const NameValuePairs ¶ms); 20 void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;} 21 void Resynchronize(const byte *iv, int length=-1); 22 void Update(const byte *input, size_t length); 23 void ProcessData(byte *outString, const byte *inString, size_t length); 24 void TruncatedFinal(byte *mac, size_t macSize); 25 26protected: 27 void AuthenticateData(const byte *data, size_t len); 28 const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();}; 29 30 virtual SymmetricCipher & AccessSymmetricCipher() =0; 31 virtual bool AuthenticationIsOnPlaintext() const =0; 32 virtual unsigned int AuthenticationBlockSize() const =0; 33 virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms) =0; 34 virtual void Resync(const byte *iv, size_t len) =0; 35 virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0; 36 virtual void AuthenticateLastHeaderBlock() =0; 37 virtual void AuthenticateLastConfidentialBlock() {} 38 virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0; 39 40 enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter}; 41 State m_state; 42 unsigned int m_bufferedDataLength; 43 lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength; 44 AlignedSecByteBlock m_buffer; 45}; 46 47NAMESPACE_END 48 49#endif 50