77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
// cmac.h - originally 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"
|
|
|
|
/// \brief Enable CMAC and wide block ciphers
|
|
/// \details CMAC is only defined for AES. The library can support wide
|
|
/// block ciphers like Kaylna and Threefish since we know the polynomials.
|
|
#ifndef CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS
|
|
# define CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS 1
|
|
#endif // CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
/// \brief CMAC base implementation
|
|
/// \since Crypto++ 5.6.0
|
|
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
|
|
{
|
|
public:
|
|
|
|
virtual ~CMAC_Base() {}
|
|
CMAC_Base() : m_counter(0) {}
|
|
|
|
void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
|
|
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();}
|
|
std::string AlgorithmProvider() const {return GetCipher().AlgorithmProvider();}
|
|
|
|
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
|