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113 lines
3.7 KiB
113 lines
3.7 KiB
5 years ago
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// eax.h - written and placed in the public domain by Wei Dai
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//! \file
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//! \headerfile eax.h
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//! \brief EAX block cipher mode of operation
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#ifndef CRYPTOPP_EAX_H
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#define CRYPTOPP_EAX_H
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#include "authenc.h"
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#include "modes.h"
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#include "cmac.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \class EAX_Base
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//! \brief EAX block cipher mode of operation
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//! \details Implementations and overrides in \p EAX_Base apply to both \p ENCRYPTION and \p DECRYPTION directions
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class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
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{
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public:
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// AuthenticatedSymmetricCipher
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std::string AlgorithmName() const
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{return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
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size_t MinKeyLength() const
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{return GetMAC().MinKeyLength();}
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size_t MaxKeyLength() const
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{return GetMAC().MaxKeyLength();}
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size_t DefaultKeyLength() const
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{return GetMAC().DefaultKeyLength();}
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size_t GetValidKeyLength(size_t n) const
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{return GetMAC().GetValidKeyLength(n);}
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bool IsValidKeyLength(size_t n) const
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{return GetMAC().IsValidKeyLength(n);}
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unsigned int OptimalDataAlignment() const
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{return GetMAC().OptimalDataAlignment();}
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IV_Requirement IVRequirement() const
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{return UNIQUE_IV;}
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unsigned int IVSize() const
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{return GetMAC().TagSize();}
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unsigned int MinIVLength() const
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{return 0;}
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unsigned int MaxIVLength() const
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{return UINT_MAX;}
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unsigned int DigestSize() const
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{return GetMAC().TagSize();}
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lword MaxHeaderLength() const
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{return LWORD_MAX;}
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lword MaxMessageLength() const
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{return LWORD_MAX;}
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protected:
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// AuthenticatedSymmetricCipherBase
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bool AuthenticationIsOnPlaintext() const
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{return false;}
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unsigned int AuthenticationBlockSize() const
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{return 1;}
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void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
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void Resync(const byte *iv, size_t len);
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size_t AuthenticateBlocks(const byte *data, size_t len);
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void AuthenticateLastHeaderBlock();
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void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
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SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
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const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();}
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virtual CMAC_Base & AccessMAC() =0;
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CTR_Mode_ExternalCipher::Encryption m_ctr;
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};
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//! \class EAX_Final
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//! \brief Class specific methods used to operate the cipher.
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//! \tparam T_BlockCipher block cipher
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//! \tparam T_IsEncryption direction in which to operate the cipher
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//! \details Implementations and overrides in \p GCM_Final apply to either
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//! \p ENCRYPTION or \p DECRYPTION, depending on the template parameter \p T_IsEncryption.
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//! \details \p EAX_Final does not use inner classes \p Enc and \p Dec.
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template <class T_BlockCipher, bool T_IsEncryption>
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class EAX_Final : public EAX_Base
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{
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public:
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static std::string StaticAlgorithmName()
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{return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");}
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bool IsForwardTransformation() const
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{return T_IsEncryption;}
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private:
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CMAC_Base & AccessMAC() {return m_cmac;}
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CMAC<T_BlockCipher> m_cmac;
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};
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#ifdef EAX // EAX is defined to 11 on GCC 3.4.3, OpenSolaris 8.11
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#undef EAX
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#endif
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//! \class EAX
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//! \brief The EAX block cipher mode of operation
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//! \details EAX is an Authenticated Encryption with Associated Data (AEAD) block
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//! cipher mode of operation designed to simultaneously provide both authentication
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//! and privacy of the message.
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//! \tparam T_BlockCipher block cipher
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//! \details \p EAX provides the \p Encryption and \p Decryption typedef.
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//! \sa <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a> at the Crypto Lounge
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template <class T_BlockCipher>
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struct EAX : public AuthenticatedSymmetricCipherDocumentation
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{
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typedef EAX_Final<T_BlockCipher, true> Encryption;
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typedef EAX_Final<T_BlockCipher, false> Decryption;
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};
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NAMESPACE_END
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#endif
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