multiexp.h

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// Copyright (c) 2017, The Monero Project
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// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 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
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// Adapted from Python code by Sarang Noether
 
#pragma once
 
#ifndef MULTIEXP_H
#define MULTIEXP_H
 
#include <vector>
#include "crypto/crypto.h"
#include "rctTypes.h"
#include "misc_log_ex.h"
 
namespace rct
{
 
struct MultiexpData {
  rct::key scalar;
  ge_p3 point;
 
  MultiexpData() {}
  MultiexpData(const rct::key &s, const ge_p3 &p): scalar(s), point(p) {}
  MultiexpData(const rct::key &s, const rct::key &p): scalar(s)
  {
    CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&point, p.bytes) == 0, "ge_frombytes_vartime failed");
  }
};
 
struct straus_cached_data;
struct pippenger_cached_data;
 
rct::key bos_coster_heap_conv(std::vector<MultiexpData> data);
rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> data);
std::shared_ptr<straus_cached_data> straus_init_cache(const std::vector<MultiexpData> &data, size_t N =0);
size_t straus_get_cache_size(const std::shared_ptr<straus_cached_data> &cache);
rct::key straus(const std::vector<MultiexpData> &data, const std::shared_ptr<straus_cached_data> &cache = NULL, size_t STEP = 0);
std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<MultiexpData> &data, size_t start_offset = 0, size_t N =0);
size_t pippenger_get_cache_size(const std::shared_ptr<pippenger_cached_data> &cache);
size_t get_pippenger_c(size_t N);
rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<pippenger_cached_data> &cache = NULL, size_t cache_size = 0, size_t c = 0);
 
}
 
#endif