/************************************************* * EAX Mode Header File * * (C) 1999-2007 Jack Lloyd * *************************************************/ #ifndef BOTAN_EAX_H__ #define BOTAN_EAX_H__ #include namespace Botan { /************************************************* * EAX Base Class * *************************************************/ class BOTAN_DLL EAX_Base : public Keyed_Filter { public: void set_key(const SymmetricKey&); void set_iv(const InitializationVector&); void set_header(const byte[], u32bit); std::string name() const; bool valid_keylength(u32bit) const; ~EAX_Base() { delete cipher; delete mac; } protected: EAX_Base(const std::string&, u32bit); void start_msg(); void increment_counter(); const u32bit TAG_SIZE, BLOCK_SIZE; BlockCipher* cipher; MessageAuthenticationCode* mac; SecureVector nonce_mac, header_mac, state, buffer; u32bit position; }; /************************************************* * EAX Encryption * *************************************************/ class BOTAN_DLL EAX_Encryption : public EAX_Base { public: EAX_Encryption(const std::string&, u32bit = 0); EAX_Encryption(const std::string&, const SymmetricKey&, const InitializationVector&, u32bit = 0); private: void write(const byte[], u32bit); void end_msg(); }; /************************************************* * EAX Decryption * *************************************************/ class BOTAN_DLL EAX_Decryption : public EAX_Base { public: EAX_Decryption(const std::string&, u32bit = 0); EAX_Decryption(const std::string&, const SymmetricKey&, const InitializationVector&, u32bit = 0); private: void write(const byte[], u32bit); void do_write(const byte[], u32bit); void end_msg(); SecureVector queue; u32bit queue_start, queue_end; }; } #endif