multiexp.h

Go to the documentation of this file.

// Copyright (c) 2018, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
 
#pragma once
 
#include <vector>
#include "ringct/rctOps.h"
#include "ringct/multiexp.h"
 
enum test_multiexp_algorithm
{
  multiexp_bos_coster,
  multiexp_straus,
  multiexp_straus_cached,
  multiexp_pippenger,
  multiexp_pippenger_cached,
};
 
template<test_multiexp_algorithm algorithm, size_t npoints, size_t c=0>
class test_multiexp
{
public:
  static const size_t loop_count = npoints >= 1024 ? 10 : npoints < 256 ? 1000 : 100;
 
  bool init()
  {
    data.resize(npoints);
    res = rct::identity();
    for (size_t n = 0; n < npoints; ++n)
    {
      data[n].scalar = rct::skGen();
      rct::key point = rct::scalarmultBase(rct::skGen());
      if (ge_frombytes_vartime(&data[n].point, point.bytes))
        return false;
      rct::key kn = rct::scalarmultKey(point, data[n].scalar);
      res = rct::addKeys(res, kn);
    }
    straus_cache = rct::straus_init_cache(data);
    pippenger_cache = rct::pippenger_init_cache(data);
    return true;
  }
 
  bool test()
  {
    switch (algorithm)
    {
      case multiexp_bos_coster:
        return res == bos_coster_heap_conv_robust(data);
      case multiexp_straus:
        return res == straus(data);
      case multiexp_straus_cached:
        return res == straus(data, straus_cache);
      case multiexp_pippenger:
        return res == pippenger(data, NULL, 0, c);
      case multiexp_pippenger_cached:
        return res == pippenger(data, pippenger_cache, 0, c);
      default:
        return false;
    }
  }
 
private:
  std::vector<rct::MultiexpData> data;
  std::shared_ptr<rct::straus_cached_data> straus_cache;
  std::shared_ptr<rct::pippenger_cached_data> pippenger_cache;
  rct::key res;
};