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
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
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 ¶ms);
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
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