twofish.h

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/*
* 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