/*

* Serpent

* (C) 1999-2007 Jack Lloyd

*

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

*/

#ifndef BOTAN_SERPENT_H_

#define BOTAN_SERPENT_H_

#include <botan/block_cipher.h>

BOTAN_FUTURE_INTERNAL_HEADER(serpent.h)

namespace Botan {

/**

* Serpent is the most conservative of the AES finalists

* https://www.cl.cam.ac.uk/~rja14/serpent.html

*/

class BOTAN_PUBLIC_API(2,0) Serpent 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 provider() const override;

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

      BlockCipher* clone() const override { return new Serpent; }

      size_t parallelism() const override { return 4; }

   private:

#if defined(BOTAN_HAS_SERPENT_SIMD)

      void simd_encrypt_4(const uint8_t in[64], uint8_t out[64]) const;

      void simd_decrypt_4(const uint8_t in[64], uint8_t out[64]) const;

#endif

#if defined(BOTAN_HAS_SERPENT_AVX2)

      void avx2_encrypt_8(const uint8_t in[64], uint8_t out[64]) const;

      void avx2_decrypt_8(const uint8_t in[64], uint8_t out[64]) const;

#endif

      void key_schedule(const uint8_t key[], size_t length) override;

      secure_vector<uint32_t> m_round_key;

   };

}

#endif