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externals/cryptopp/cbcmac.h

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+// 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 &params);
+	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:
+	/// \brief Construct a CBC_MAC
+	CBC_MAC() {}
+	/// \brief Construct a CBC_MAC
+	/// \param key a byte buffer used to key the cipher
+	/// \param length the length of the byte buffer
+	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