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59 lines
1.7 KiB
59 lines
1.7 KiB
5 years ago
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// cmac.h - written and placed in the public domain by Wei Dai
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//! \file
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//! \headerfile cmac.h
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//! \brief Classes for CMAC message authentication code
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#ifndef CRYPTOPP_CMAC_H
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#define CRYPTOPP_CMAC_H
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#include "seckey.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! _
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode
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{
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public:
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CMAC_Base() : m_counter(0) {}
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void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
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void Update(const byte *input, size_t length);
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void TruncatedFinal(byte *mac, size_t size);
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unsigned int DigestSize() const {return GetCipher().BlockSize();}
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unsigned int OptimalBlockSize() const {return GetCipher().BlockSize();}
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unsigned int OptimalDataAlignment() const {return GetCipher().OptimalDataAlignment();}
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protected:
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friend class EAX_Base;
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const BlockCipher & GetCipher() const {return const_cast<CMAC_Base*>(this)->AccessCipher();}
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virtual BlockCipher & AccessCipher() =0;
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void ProcessBuf();
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SecByteBlock m_reg;
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unsigned int m_counter;
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};
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/// <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a>
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/*! Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32 */
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template <class T>
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class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T>
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{
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public:
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CMAC() {}
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CMAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH)
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{this->SetKey(key, length);}
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static std::string StaticAlgorithmName() {return std::string("CMAC(") + T::StaticAlgorithmName() + ")";}
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private:
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BlockCipher & AccessCipher() {return m_cipher;}
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typename T::Encryption m_cipher;
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};
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NAMESPACE_END
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#endif
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