cmac.h
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// cmac.h - written and placed in the public domain by Wei Dai
//! \file cmac.h
//! \brief Classes for CMAC message authentication code
//! \since Crypto++ 5.6.0
#ifndef CRYPTOPP_CMAC_H
#define CRYPTOPP_CMAC_H
#include "seckey.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! \class CMAC_Base
//! \brief CMAC base implementation
//! \since Crypto++ 5.6.0
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
{
public:
CMAC_Base() : m_counter(0) {}
void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
void Update(const byte *input, size_t length);
void TruncatedFinal(byte *mac, size_t size);
unsigned int DigestSize() const {return GetCipher().BlockSize();}
unsigned int OptimalBlockSize() const {return GetCipher().BlockSize();}
unsigned int OptimalDataAlignment() const {return GetCipher().OptimalDataAlignment();}
protected:
friend class EAX_Base;
const BlockCipher & GetCipher() const {return const_cast<CMAC_Base*>(this)->AccessCipher();}
virtual BlockCipher & AccessCipher() =0;
void ProcessBuf();
SecByteBlock m_reg;
unsigned int m_counter;
};
//! \brief CMAC message authentication code
//! \tparam T block cipher
//! \details Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32.
//! \sa <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a>
//! \since Crypto++ 5.6.0
template <class T>
class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T>
{
public:
//! \brief Construct a CMAC
CMAC() {}
//! \brief Construct a CMAC
//! \param key the MAC key
//! \param length the key size, in bytes
CMAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH)
{this->SetKey(key, length);}
static std::string StaticAlgorithmName() {return std::string("CMAC(") + T::StaticAlgorithmName() + ")";}
private:
BlockCipher & AccessCipher() {return m_cipher;}
typename T::Encryption m_cipher;
};
NAMESPACE_END
#endif
MessageAuthenticationCode
Interface for message authentication codes.
Definition: cryptlib.h:1107
SimpleKeyingInterface::SetKey
virtual void SetKey(const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
Sets or reset the key of this object.
Definition: cryptlib.cpp:101
CMAC_Base::DigestSize
unsigned int DigestSize() const
Provides the digest size of the hash.
Definition: cmac.h:26
EAX_Base
EAX block cipher base implementation.
Definition: eax.h:19
SecByteBlock
SecBlock<byte> typedef.
Definition: secblock.h:731
BlockCipher
Interface for one direction (encryption or decryption) of a block cipher.
Definition: cryptlib.h:1091
CMAC
CMAC message authentication code.
Definition: cmac.h:47
secblock.h
Classes and functions for secure memory allocations.
CMAC_Base::OptimalDataAlignment
unsigned int OptimalDataAlignment() const
Provides input and output data alignment for optimal performance.
Definition: cmac.h:28
CMAC::CMAC
CMAC()
Construct a CMAC.
Definition: cmac.h:51
seckey.h
Classes and functions for implementing secret key algorithms.
CMAC_Base::OptimalBlockSize
unsigned int OptimalBlockSize() const
Provides the input block size most efficient for this hash.
Definition: cmac.h:27
MessageAuthenticationCodeImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for message authentication code...
Definition: seckey.h:385
SameKeyLengthAs
Provides key lengths based on another class&#39;s key length.
Definition: seckey.h:237
CMAC::CMAC
CMAC(const byte *key, size_t length=SameKeyLengthAs< T >::DEFAULT_KEYLENGTH)
Construct a CMAC.
Definition: cmac.h:55
CMAC_Base
CMAC base implementation.
Definition: cmac.h:18
CryptoPP
Crypto++ library namespace.
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:277