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cmac.h

    00001 #ifndef CRYPTOPP_CMAC_H
    00002 #define CRYPTOPP_CMAC_H
    00003
    00004 #include "seckey.h"
    00005 #include "secblock.h"
    00006
    00007 NAMESPACE_BEGIN(CryptoPP)
    00008
    00009 //! _
    00010 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
    00011 {
    00012 public:
    00013     CMAC_Base() {}
    00014
    00015     void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
    00016     void Update(const byte *input, size_t length);
    00017     void TruncatedFinal(byte *mac, size_t size);
    00018     unsigned int DigestSize() const {return GetCipher().BlockSize();}
    00019     unsigned int OptimalBlockSize() const {return GetCipher().BlockSize();}
    00020     unsigned int OptimalDataAlignment() const {return GetCipher().OptimalDataAlignment();}
    00021
    00022 protected:
    00023     friend class EAX_Base;
    00024
    00025     const BlockCipher & GetCipher() const {return const_cast<CMAC_Base*>(this)->AccessCipher();}
    00026     virtual BlockCipher & AccessCipher() =0;
    00027
    00028     void ProcessBuf();
    00029     SecByteBlock m_reg;
    00030     unsigned int m_counter;
    00031 };
    00032
    00033 /// <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a>
    00034 /*! Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32 */
    00035 template <class T>
    00036 class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T>
    00037 {
    00038 public:
    00039     CMAC() {}
    00040     CMAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH)
    00041         {this->SetKey(key, length);}
    00042
    00043     static std::string StaticAlgorithmName() {return std::string("CMAC(") + T::StaticAlgorithmName() + ")";}
    00044
    00045 private:
    00046     BlockCipher & AccessCipher() {return m_cipher;}
    00047     typename T::Encryption m_cipher;
    00048 };
    00049
    00050 NAMESPACE_END
    00051
    00052 #endif