/*

* SHA-3

* (C) 2010,2016 Jack Lloyd

*

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

*/

#ifndef BOTAN_SHA3_H_

#define BOTAN_SHA3_H_

#include <botan/hash.h>

#include <botan/secmem.h>

#include <botan/internal/keccak_perm.h>

#include <string>

namespace Botan {

/**

* SHA-3

*/

class SHA_3 : public HashFunction {

   public:

      /**

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

      *                    224, 256, 384, or 512

      */

      explicit SHA_3(size_t output_bits);

      size_t hash_block_size() const override { return m_keccak.byte_rate(); }

      size_t output_length() const override { return m_output_length; }

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

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

      std::string name() const override;

      void clear() override;

      std::string provider() const override;

   private:

      void add_data(std::span<const uint8_t> input) override;

      void final_result(std::span<uint8_t> out) override;

   private:

      Keccak_Permutation m_keccak;

      size_t m_output_length;

};

/**

* SHA-3-224

*/

class SHA_3_224 final : public SHA_3 {

   public:

      SHA_3_224() : SHA_3(224) {}

};

/**

* SHA-3-256

*/

class SHA_3_256 final : public SHA_3 {

   public:

      SHA_3_256() : SHA_3(256) {}

};

/**

* SHA-3-384

*/

class SHA_3_384 final : public SHA_3 {

   public:

      SHA_3_384() : SHA_3(384) {}

};

/**

* SHA-3-512

*/

class SHA_3_512 final : public SHA_3 {

   public:

      SHA_3_512() : SHA_3(512) {}

};

}  // namespace Botan

#endif