cmac.h
#ifndef CRYPTOPP_CMAC_H
#define CRYPTOPP_CMAC_H
#include "seckey.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! _
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
{
public:
CMAC_Base() {}
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;
};
/// <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a>
/*! Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32 */
template <class T>
class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T>
{
public:
CMAC() {}
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:617
SimpleKeyingInterface::SetKey
virtual void SetKey(const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
set or reset the key of this object
SecBlock< byte >
EAX_Base
Definition: eax.h:11
BlockCipher
interface for one direction (encryption or decryption) of a block cipher
Definition: cryptlib.h:603
CMAC
CMAC
Definition: cmac.h:36
MessageAuthenticationCodeImpl
_
Definition: seckey.h:167
SameKeyLengthAs
support query of key length that's the same as another class
Definition: seckey.h:114
CMAC_Base::OptimalBlockSize
unsigned int OptimalBlockSize() const
input to Update() should have length a multiple of this for optimal speed
Definition: cmac.h:19
CMAC_Base::OptimalDataAlignment
unsigned int OptimalDataAlignment() const
returns how input should be aligned for optimal performance
Definition: cmac.h:20
CMAC_Base::DigestSize
unsigned int DigestSize() const
size of the hash/digest/MAC returned by Final()
Definition: cmac.h:18
CMAC_Base
_
Definition: cmac.h:10
NameValuePairs
interface for retrieving values given their names
Definition: cryptlib.h:224