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 ¶ms);
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
00034
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