/*

* Keccak

* (C) 2010 Jack Lloyd

*

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

*/

#ifndef BOTAN_KECCAK_H_

#define BOTAN_KECCAK_H_

#include <botan/hash.h>

#include <botan/secmem.h>

#include <string>

namespace Botan {

/**

* Keccak[1600], a SHA-3 candidate

*/

class Keccak_1600 final : public HashFunction

   {

   public:

      /**

      * @param output_bits the size of the hash output; must be one of

      *                    224, 256, 384, or 512

      */

      explicit Keccak_1600(size_t output_bits = 512);

      size_t hash_block_size() const override { return m_bitrate / 8; }

      size_t output_length() const override { return m_output_bits / 8; }

      std::unique_ptr<HashFunction> new_object() const override;

      std::unique_ptr<HashFunction> copy_state() const override;

      std::string name() const override;

      void clear() override;

   private:

      void add_data(const uint8_t input[], size_t length) override;

      void final_result(uint8_t out[]) override;

      size_t m_output_bits, m_bitrate;

      secure_vector<uint64_t> m_S;

      size_t m_S_pos;

   };

}

#endif