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57 lines
1.5 KiB
57 lines
1.5 KiB
5 years ago
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// cbcmac.h - written and placed in the public domain by Wei Dai
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//! \file
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//! \headerfile cbcmac.h
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//! \brief Classes for CBC MAC
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#ifndef CRYPTOPP_CBCMAC_H
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#define CRYPTOPP_CBCMAC_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 CBC_MAC_Base : public MessageAuthenticationCode
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{
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public:
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CBC_MAC_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 const_cast<CBC_MAC_Base*>(this)->AccessCipher().BlockSize();}
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protected:
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virtual BlockCipher & AccessCipher() =0;
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private:
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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.weidai.com/scan-mirror/mac.html#CBC-MAC">CBC-MAC</a>
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/*! Compatible with FIPS 113. T should be a class derived from BlockCipherDocumentation.
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Secure only for fixed length messages. For variable length messages use CMAC or DMAC.
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*/
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template <class T>
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class CBC_MAC : public MessageAuthenticationCodeImpl<CBC_MAC_Base, CBC_MAC<T> >, public SameKeyLengthAs<T>
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{
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public:
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CBC_MAC() {}
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CBC_MAC(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("CBC-MAC(") + 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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