oxen-core/src/ringct/multiexp.h

// Copyright (c) 2017, The Monero Project
//
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// 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.
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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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//    used to endorse or promote products derived from this software without specific
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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 "epee/misc_log_ex.h"
#include "rctTypes.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);

}  // namespace rct

#endif