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// eax.h - originally written and placed in the public domain by Wei Dai
/// \file eax.h
/// \brief EAX block cipher mode of operation
#ifndef CRYPTOPP_EAX_H
#define CRYPTOPP_EAX_H
#include "authenc.h"
#include "modes.h"
#include "cmac.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief EAX block cipher base implementation
/// \details Base implementation of the AuthenticatedSymmetricCipher interface
/// \since Crypto++ 5.6.0
class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
{
public:
// AuthenticatedSymmetricCipher
std::string AlgorithmName() const
{return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
std::string AlgorithmProvider() const
{return GetMAC().GetCipher().AlgorithmProvider();}
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;
};
/// \brief EAX block cipher final implementation
/// \tparam T_BlockCipher block cipher
/// \tparam T_IsEncryption direction in which to operate the cipher
/// \since Crypto++ 5.6.0
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");}
std::string AlgorithmProvider() const
{return m_cmac.AlgorithmProvider();}
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
/// \brief EAX block cipher mode of operation
/// \tparam T_BlockCipher block cipher
/// \details \p EAX provides the \p Encryption and \p Decryption typedef. See EAX_Base
/// and EAX_Final for the AuthenticatedSymmetricCipher implementation.
/// \sa <a href="http://www.cryptopp.com/wiki/EAX_Mode">EAX Mode</a> and
/// <A HREF="http://www.cryptopp.com/wiki/Modes_of_Operation">Modes of Operation</A>
/// on the Crypto++ wiki.
/// \since Crypto++ 5.6.0
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
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