gost_3411.h

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/*
* GOST 34.11
* (C) 2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_GOST_3411_H_
#define BOTAN_GOST_3411_H_
 
#include <botan/hash.h>
#include <botan/internal/alignment_buffer.h>
#include <botan/internal/gost_28147.h>
 
namespace Botan {
 
/**
* GOST 34.11
*/
class GOST_34_11 final : public HashFunction {
   public:
      std::string name() const override { return "GOST-R-34.11-94"; }
 
      size_t output_length() const override { return 32; }
 
      size_t hash_block_size() const override { return 32; }
 
      /*
      A collision attack with cost ~2^105 is known, described in
      "Cryptanalysis of the GOST Hash Function"
      Mendel, Pramstaller, Rechberger1, Kontak, and Szmidt
      */
      size_t security_level() const override { return 105; }
 
      std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<GOST_34_11>(); }
 
      std::unique_ptr<HashFunction> copy_state() const override;
 
      void clear() override;
 
      GOST_34_11();
 
   private:
      void compress_n(const uint8_t input[], size_t blocks);
 
      void add_data(std::span<const uint8_t> input) override;
      void final_result(std::span<uint8_t> output) override;
 
      GOST_28147_89 m_cipher;
      AlignmentBuffer<uint8_t, 32> m_buffer;
      secure_vector<uint8_t> m_sum, m_hash;
      uint64_t m_count;
};
 
}  // namespace Botan
 
#endif