00001 #ifndef CRYPTOPP_AUTHENC_H
00002 #define CRYPTOPP_AUTHENC_H
00003
00004 #include "cryptlib.h"
00005 #include "secblock.h"
00006
00007 NAMESPACE_BEGIN(CryptoPP)
00008
00009
00010 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
00011 {
00012 public:
00013 AuthenticatedSymmetricCipherBase() : m_state(State_Start) {}
00014
00015 bool IsRandomAccess() const {return false;}
00016 bool IsSelfInverting() const {return true;}
00017 void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
00018
00019 void SetKey(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
00020 void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
00021 void Resynchronize(const byte *iv, int length=-1);
00022 void Update(const byte *input, size_t length);
00023 void ProcessData(byte *outString, const byte *inString, size_t length);
00024 void TruncatedFinal(byte *mac, size_t macSize);
00025
00026 protected:
00027 void AuthenticateData(const byte *data, size_t len);
00028 const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
00029
00030 virtual SymmetricCipher & AccessSymmetricCipher() =0;
00031 virtual bool AuthenticationIsOnPlaintext() const =0;
00032 virtual unsigned int AuthenticationBlockSize() const =0;
00033 virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms) =0;
00034 virtual void Resync(const byte *iv, size_t len) =0;
00035 virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
00036 virtual void AuthenticateLastHeaderBlock() =0;
00037 virtual void AuthenticateLastConfidentialBlock() {}
00038 virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
00039
00040 enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
00041 State m_state;
00042 unsigned int m_bufferedDataLength;
00043 lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
00044 AlignedSecByteBlock m_buffer;
00045 };
00046
00047 NAMESPACE_END
00048
00049 #endif
