You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.7 KiB
60 lines
1.7 KiB
![]()
4 years ago
|
// cbcmac.h - originally written and placed in the public domain by Wei Dai
|
||
|
|
||
|
/// \file
|
||
|
/// \brief Classes for CBC MAC
|
||
|
/// \since Crypto++ 3.1
|
||
|
|
||
|
#ifndef CRYPTOPP_CBCMAC_H
|
||
|
#define CRYPTOPP_CBCMAC_H
|
||
|
|
||
|
#include "seckey.h"
|
||
|
#include "secblock.h"
|
||
|
|
||
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
||
|
/// \brief CBC-MAC base class
|
||
|
/// \since Crypto++ 3.1
|
||
|
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_MAC_Base : public MessageAuthenticationCode
|
||
|
{
|
||
|
public:
|
||
|
CBC_MAC_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 const_cast<CBC_MAC_Base*>(this)->AccessCipher().BlockSize();}
|
||
|
|
||
|
protected:
|
||
|
virtual BlockCipher & AccessCipher() =0;
|
||
|
|
||
|
private:
|
||
|
void ProcessBuf();
|
||
|
SecByteBlock m_reg;
|
||
|
unsigned int m_counter;
|
||
|
};
|
||
|
|
||
|
/// \brief CBC-MAC
|
||
|
/// \tparam T BlockCipherDocumentation derived class
|
||
|
/// \details CBC-MAC is compatible with FIPS 113. The MAC is secure only for fixed
|
||
|
/// length messages. For variable length messages use CMAC or DMAC.
|
||
|
/// \sa <a href="http://www.weidai.com/scan-mirror/mac.html#CBC-MAC">CBC-MAC</a>
|
||
|
/// \since Crypto++ 3.1
|
||
|
template <class T>
|
||
|
class CBC_MAC : public MessageAuthenticationCodeImpl<CBC_MAC_Base, CBC_MAC<T> >, public SameKeyLengthAs<T>
|
||
|
{
|
||
|
public:
|
||
|
CBC_MAC() {}
|
||
|
CBC_MAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH)
|
||
|
{this->SetKey(key, length);}
|
||
|
|
||
|
static std::string StaticAlgorithmName() {return std::string("CBC-MAC(") + T::StaticAlgorithmName() + ")";}
|
||
|
|
||
|
private:
|
||
|
BlockCipher & AccessCipher() {return m_cipher;}
|
||
|
typename T::Encryption m_cipher;
|
||
|
};
|
||
|
|
||
|
NAMESPACE_END
|
||
|
|
||
|
#endif
|