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Diffstat (limited to '')
| -rw-r--r-- | CryptoPP/eax.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/CryptoPP/eax.h b/CryptoPP/eax.h new file mode 100644 index 000000000..e48ee92b5 --- /dev/null +++ b/CryptoPP/eax.h @@ -0,0 +1,91 @@ +#ifndef CRYPTOPP_EAX_H +#define CRYPTOPP_EAX_H + +#include "authenc.h" +#include "modes.h" +#include "cmac.h" + +NAMESPACE_BEGIN(CryptoPP) + +//! . +class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase +{ +public: + // AuthenticatedSymmetricCipher + std::string AlgorithmName() const + {return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");} + size_t MinKeyLength() const + {return GetMAC().MinKeyLength();} + size_t MaxKeyLength() const + {return GetMAC().MaxKeyLength();} + size_t DefaultKeyLength() const + {return GetMAC().DefaultKeyLength();} + size_t GetValidKeyLength(size_t n) const + {return GetMAC().GetValidKeyLength(n);} + bool IsValidKeyLength(size_t n) const + {return GetMAC().IsValidKeyLength(n);} + unsigned int OptimalDataAlignment() const + {return GetMAC().OptimalDataAlignment();} + IV_Requirement IVRequirement() const + {return UNIQUE_IV;} + unsigned int IVSize() const + {return GetMAC().TagSize();} + unsigned int MinIVLength() const + {return 0;} + unsigned int MaxIVLength() const + {return UINT_MAX;} + unsigned int DigestSize() const + {return GetMAC().TagSize();} + lword MaxHeaderLength() const + {return LWORD_MAX;} + lword MaxMessageLength() const + {return LWORD_MAX;} + +protected: + // AuthenticatedSymmetricCipherBase + bool AuthenticationIsOnPlaintext() const + {return false;} + unsigned int AuthenticationBlockSize() const + {return 1;} + void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms); + void Resync(const byte *iv, size_t len); + size_t AuthenticateBlocks(const byte *data, size_t len); + void AuthenticateLastHeaderBlock(); + void AuthenticateLastFooterBlock(byte *mac, size_t macSize); + SymmetricCipher & AccessSymmetricCipher() {return m_ctr;} + const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();} + virtual CMAC_Base & AccessMAC() =0; + + CTR_Mode_ExternalCipher::Encryption m_ctr; +}; + +//! . +template <class T_BlockCipher, bool T_IsEncryption> +class EAX_Final : public EAX_Base +{ +public: + static std::string StaticAlgorithmName() + {return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");} + bool IsForwardTransformation() const + {return T_IsEncryption;} + +private: + CMAC_Base & AccessMAC() {return m_cmac;} + CMAC<T_BlockCipher> m_cmac; +}; + +#ifdef EAX // EAX is defined to 11 on GCC 3.4.3, OpenSolaris 8.11 +#undef EAX +#endif + +/// <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a> +template <class T_BlockCipher> +struct EAX : public AuthenticatedSymmetricCipherDocumentation +{ + typedef EAX_Final<T_BlockCipher, true> Encryption; + typedef EAX_Final<T_BlockCipher, false> Decryption; +}; + +NAMESPACE_END + +#endif |