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authenc.h

    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 &params);
    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 &params) =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