/* * OFB Mode * (C) 1999-2007 Jack Lloyd * * Distributed under the terms of the Botan license */ #ifndef BOTAN_OUTPUT_FEEDBACK_MODE_H__ #define BOTAN_OUTPUT_FEEDBACK_MODE_H__ #include #include namespace Botan { /** * Output Feedback Mode */ class BOTAN_DLL OFB : public StreamCipher { public: void cipher(const byte in[], byte out[], size_t length); void set_iv(const byte iv[], size_t iv_len); bool valid_iv_length(size_t iv_len) const { return (iv_len <= m_cipher->block_size()); } Key_Length_Specification key_spec() const { return m_cipher->key_spec(); } std::string name() const; OFB* clone() const { return new OFB(m_cipher->clone()); } void clear(); /** * @param cipher the underlying block cipher to use */ OFB(BlockCipher* cipher); private: void key_schedule(const byte key[], size_t key_len); std::unique_ptr m_cipher; secure_vector m_buffer; size_t m_buf_pos; }; } #endif