/************************************************* * Filters Header File * * (C) 1999-2007 Jack Lloyd * *************************************************/ #ifndef BOTAN_FILTERS_H__ #define BOTAN_FILTERS_H__ #include #include #include #include #include namespace Botan { /************************************************* * Stream Cipher Filter * *************************************************/ class BOTAN_DLL StreamCipher_Filter : public Keyed_Filter { public: void seek(u32bit position) { cipher->seek(position); } bool supports_resync() const { return (cipher->IV_LENGTH != 0); } void set_iv(const InitializationVector&); void write(const byte[], u32bit); StreamCipher_Filter(const std::string&); StreamCipher_Filter(const std::string&, const SymmetricKey&); ~StreamCipher_Filter() { delete cipher; } private: SecureVector buffer; StreamCipher* cipher; }; /************************************************* * Hash Filter * *************************************************/ class BOTAN_DLL Hash_Filter : public Filter { public: void write(const byte input[], u32bit len) { hash->update(input, len); } void end_msg(); Hash_Filter(const std::string&, u32bit = 0); ~Hash_Filter() { delete hash; } private: const u32bit OUTPUT_LENGTH; HashFunction* hash; }; /************************************************* * MessageAuthenticationCode Filter * *************************************************/ class BOTAN_DLL MAC_Filter : public Keyed_Filter { public: void write(const byte input[], u32bit len) { mac->update(input, len); } void end_msg(); MAC_Filter(const std::string&, u32bit = 0); MAC_Filter(const std::string&, const SymmetricKey&, u32bit = 0); ~MAC_Filter() { delete mac; } private: const u32bit OUTPUT_LENGTH; MessageAuthenticationCode* mac; }; } #endif