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eax.h

00001 #ifndef CRYPTOPP_EAX_H
00002 #define CRYPTOPP_EAX_H
00003 
00004 #include "authenc.h"
00005 #include "modes.h"
00006 #include "cmac.h"
00007 
00008 NAMESPACE_BEGIN(CryptoPP)
00009 
00010 //! .
00011 class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
00012 {
00013 public:
00014     // AuthenticatedSymmetricCipher
00015     std::string AlgorithmName() const
00016         {return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
00017     size_t MinKeyLength() const
00018         {return GetMAC().MinKeyLength();}
00019     size_t MaxKeyLength() const
00020         {return GetMAC().MaxKeyLength();}
00021     size_t DefaultKeyLength() const
00022         {return GetMAC().DefaultKeyLength();}
00023     size_t GetValidKeyLength(size_t n) const
00024         {return GetMAC().GetValidKeyLength(n);}
00025     bool IsValidKeyLength(size_t n) const
00026         {return GetMAC().IsValidKeyLength(n);}
00027     unsigned int OptimalDataAlignment() const
00028         {return GetMAC().OptimalDataAlignment();}
00029     IV_Requirement IVRequirement() const
00030         {return UNIQUE_IV;}
00031     unsigned int IVSize() const
00032         {return GetMAC().TagSize();}
00033     unsigned int MinIVLength() const
00034         {return 0;}
00035     unsigned int MaxIVLength() const
00036         {return UINT_MAX;}
00037     unsigned int DigestSize() const
00038         {return GetMAC().TagSize();}
00039     lword MaxHeaderLength() const
00040         {return LWORD_MAX;}
00041     lword MaxMessageLength() const
00042         {return LWORD_MAX;}
00043 
00044 protected:
00045     // AuthenticatedSymmetricCipherBase
00046     bool AuthenticationIsOnPlaintext() const
00047         {return false;}
00048     unsigned int AuthenticationBlockSize() const
00049         {return 1;}
00050     void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params);
00051     void Resync(const byte *iv, size_t len);
00052     size_t AuthenticateBlocks(const byte *data, size_t len);
00053     void AuthenticateLastHeaderBlock();
00054     void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
00055     SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
00056     const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();}
00057     virtual CMAC_Base & AccessMAC() =0;
00058 
00059     CTR_Mode_ExternalCipher::Encryption m_ctr;
00060 };
00061 
00062 //! .
00063 template <class T_BlockCipher, bool T_IsEncryption>
00064 class EAX_Final : public EAX_Base
00065 {
00066 public:
00067     static std::string StaticAlgorithmName()
00068         {return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");}
00069     bool IsForwardTransformation() const
00070         {return T_IsEncryption;}
00071 
00072 private:
00073     CMAC_Base & AccessMAC() {return m_cmac;}
00074     CMAC<T_BlockCipher> m_cmac;
00075 };
00076 
00077 #ifdef EAX  // EAX is defined to 11 on GCC 3.4.3, OpenSolaris 8.11
00078 #undef EAX
00079 #endif
00080 
00081 /// <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a>
00082 template <class T_BlockCipher>
00083 struct EAX : public AuthenticatedSymmetricCipherDocumentation
00084 {
00085     typedef EAX_Final<T_BlockCipher, true> Encryption;
00086     typedef EAX_Final<T_BlockCipher, false> Decryption;
00087 };
00088 
00089 NAMESPACE_END
00090 
00091 #endif

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