streebog.h

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/*
* Streebog
* (C) 2017 Ribose Inc.
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_STREEBOG_H_
#define BOTAN_STREEBOG_H_
 
#include <botan/hash.h>
 
#include <botan/internal/alignment_buffer.h>
 
namespace Botan {
 
/**
* Streebog (GOST R 34.11-2012)
* RFC 6986
*/
class Streebog final : public HashFunction {
   public:
      size_t output_length() const override { return m_output_bits / 8; }
 
      std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<Streebog>(m_output_bits); }
 
      void clear() override;
      std::string name() const override;
 
      size_t hash_block_size() const override { return 64; }
 
      std::unique_ptr<HashFunction> copy_state() const override;
 
      explicit Streebog(size_t output_bits);
 
   protected:
      void add_data(std::span<const uint8_t> input) override;
      void final_result(std::span<uint8_t> out) override;
 
      void compress(const uint8_t input[], bool lastblock = false);
 
      void compress_64(const uint64_t input[], bool lastblock = false);
 
   private:
      const size_t m_output_bits;
      uint64_t m_count;
      AlignmentBuffer<uint8_t, 64> m_buffer;
      secure_vector<uint64_t> m_h;
      secure_vector<uint64_t> m_S;
};
 
}  // namespace Botan
 
#endif