/* * (C) 2015 Jack Lloyd * (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity * * Botan is released under the Simplified BSD License (see license.txt) */ #ifndef BOTAN_STREAM_MODE_H__ #define BOTAN_STREAM_MODE_H__ #include <botan/cipher_mode.h> #include <botan/stream_cipher.h> namespace Botan { class BOTAN_DLL Stream_Cipher_Mode : public Cipher_Mode { public: /** * @param cipher underyling stream cipher */ explicit Stream_Cipher_Mode(StreamCipher* cipher) : m_cipher(cipher) {} size_t process(uint8_t buf[], size_t sz) override { m_cipher->cipher1(buf, sz); return sz; } void finish(secure_vector<byte>& buf, size_t offset) override { return update(buf, offset); } size_t output_length(size_t input_length) const override { return input_length; } size_t update_granularity() const override { return 1; } size_t minimum_final_size() const override { return 0; } size_t default_nonce_length() const override { return 0; } bool valid_nonce_length(size_t nonce_len) const override { return m_cipher->valid_iv_length(nonce_len); } Key_Length_Specification key_spec() const override { return m_cipher->key_spec(); } std::string name() const override { return m_cipher->name(); } void clear() override { m_cipher->clear(); reset(); } void reset() override { /* no msg state */ return; } private: void start_msg(const byte nonce[], size_t nonce_len) override { m_cipher->set_iv(nonce, nonce_len); } void key_schedule(const byte key[], size_t length) override { m_cipher->set_key(key, length); } std::unique_ptr<StreamCipher> m_cipher; }; } #endif