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56 lines
1.5 KiB
56 lines
1.5 KiB
// 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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