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# cbcmac.h

    00001 #ifndef CRYPTOPP_CBCMAC_H
    00002 #define CRYPTOPP_CBCMAC_H
    00003
    00004 #include "seckey.h"
    00005 #include "secblock.h"
    00006
    00007 NAMESPACE_BEGIN(CryptoPP)
    00008
    00009 class CRYPTOPP_DLL CBC_MAC_Base : public MessageAuthenticationCode
    00010 {
    00011 public:
    00012         CBC_MAC_Base() {}
    00013
    00014         void CheckedSetKey(void *, Empty empty, const byte *key, unsigned int length, const NameValuePairs &params);
    00015         void Update(const byte *input, unsigned int length);
    00016         void TruncatedFinal(byte *mac, unsigned int size);
    00017         unsigned int DigestSize() const {return const_cast<CBC_MAC_Base*>(this)->AccessCipher().BlockSize();}
    00018
    00019 protected:
    00020         virtual BlockCipher & AccessCipher() =0;
    00021
    00022 private:
    00023         void ProcessBuf();
    00024         SecByteBlock m_reg;
    00025         unsigned int m_counter;
    00026 };
    00027
    00028 //! <a href="http://www.weidai.com/scan-mirror/mac.html#CBC-MAC">CBC-MAC</a>
    00029 /*! Compatible with FIPS 113. T should be an encryption class.
    00030         Secure only for fixed length messages. For variable length
    00031         messages use DMAC.
    00032 */
    00033 template <class T>
    00034 class CBC_MAC : public MessageAuthenticationCodeFinalTemplate<CBC_MAC_Base, CBC_MAC<T> >, public SameKeyLengthAs<T>
    00035 {
    00036 public:
    00037         CBC_MAC() {}
    00038         CBC_MAC(const byte *key, unsigned int length=DEFAULT_KEYLENGTH)
    00039                 {SetKey(key, length);}
    00040
    00041         static std::string StaticAlgorithmName() {return std::string("CBC-MAC(") + T::StaticAlgorithmName() + ")";}
    00042
    00043 private:
    00044         BlockCipher & AccessCipher() {return m_cipher;}
    00045         typename T::Encryption m_cipher;
    00046 };
    00047
    00048 NAMESPACE_END
    00049
    00050 #endif