/*

* BLAKE2b

* (C) 2016 cynecx

*

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

*/

#ifndef BOTAN_BLAKE2B_H_

#define BOTAN_BLAKE2B_H_

#include <botan/hash.h>

#include <string>

#include <memory>

namespace Botan {

/**

* BLAKE2B

*/

class BLAKE2b final : public HashFunction

   {

   public:

      /**

      * @param output_bits the output size of BLAKE2b in bits

      */

      explicit BLAKE2b(size_t output_bits = 512);

      size_t hash_block_size() const override { return 128; }

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

      HashFunction* clone() const override;

      std::string name() const override;

      void clear() override;

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

   private:

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

      void final_result(uint8_t out[]) override;

      void state_init();

      void compress(const uint8_t* data, size_t blocks, uint64_t increment);

      const size_t m_output_bits;

      secure_vector<uint8_t> m_buffer;

      size_t m_bufpos;

      secure_vector<uint64_t> m_H;

      uint64_t m_T[2];

      uint64_t m_F[2];

   };

typedef BLAKE2b Blake2b;

}

#endif