/*

* Twofish

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_TWOFISH_H_

#define BOTAN_TWOFISH_H_

#include <botan/block_cipher.h>

#include <botan/secmem.h>

namespace Botan {

/**

* Twofish, an AES finalist

*/

class Twofish final : public Block_Cipher_Fixed_Params<16, 16, 32, 8> {

   public:

      void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;

      void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;

      void clear() override;

      std::string name() const override { return "Twofish"; }

      std::unique_ptr<BlockCipher> new_object() const override { return std::make_unique<Twofish>(); }

      bool has_keying_material() const override;

   private:

      void key_schedule(std::span<const uint8_t> key) override;

      static const uint32_t MDS0[256];

      static const uint32_t MDS1[256];

      static const uint32_t MDS2[256];

      static const uint32_t MDS3[256];

      static const uint8_t Q0[256];

      static const uint8_t Q1[256];

      static const uint8_t RS[32];

      static const uint8_t EXP_TO_POLY[255];

      static const uint8_t POLY_TO_EXP[255];

      secure_vector<uint32_t> m_SB, m_RK;

};

}  // namespace Botan

#endif