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240 lines
8.3 KiB
C++
240 lines
8.3 KiB
C++
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// Copyright (c) 2017, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Adapted from Python code by Sarang Noether
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#include "misc_log_ex.h"
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#include "common/perf_timer.h"
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extern "C"
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{
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#include "crypto/crypto-ops.h"
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}
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#include "rctOps.h"
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#include "multiexp.h"
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "multiexp.boscoster"
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//#define MULTIEXP_PERF(x) x
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#define MULTIEXP_PERF(x)
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namespace rct
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{
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static inline bool operator<(const rct::key &k0, const rct::key&k1)
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{
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for (int n = 31; n >= 0; --n)
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{
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if (k0.bytes[n] < k1.bytes[n])
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return true;
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if (k0.bytes[n] > k1.bytes[n])
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return false;
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}
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return false;
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}
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static inline rct::key div2(const rct::key &k)
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{
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rct::key res;
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int carry = 0;
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for (int n = 31; n >= 0; --n)
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{
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int new_carry = (k.bytes[n] & 1) << 7;
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res.bytes[n] = k.bytes[n] / 2 + carry;
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carry = new_carry;
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}
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return res;
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}
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rct::key bos_coster_heap_conv(std::vector<MultiexpData> &data)
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{
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(bos_coster, 1000000));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(setup, 1000000));
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size_t points = data.size();
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CHECK_AND_ASSERT_THROW_MES(points > 1, "Not enough points");
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std::vector<size_t> heap(points);
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for (size_t n = 0; n < points; ++n)
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heap[n] = n;
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auto Comp = [&](size_t e0, size_t e1) { return data[e0].scalar < data[e1].scalar; };
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std::make_heap(heap.begin(), heap.end(), Comp);
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MULTIEXP_PERF(PERF_TIMER_STOP(setup));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(loop, 1000000));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(pop, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(pop));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(add, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(add));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(sub, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(sub));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(push, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(push));
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while (heap.size() > 1)
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{
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MULTIEXP_PERF(PERF_TIMER_RESUME(pop));
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index1 = heap.back();
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heap.pop_back();
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index2 = heap.back();
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heap.pop_back();
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MULTIEXP_PERF(PERF_TIMER_PAUSE(pop));
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MULTIEXP_PERF(PERF_TIMER_RESUME(add));
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ge_cached cached;
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ge_p3_to_cached(&cached, &data[index1].point);
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ge_p1p1 p1;
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ge_add(&p1, &data[index2].point, &cached);
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ge_p1p1_to_p3(&data[index2].point, &p1);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(add));
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MULTIEXP_PERF(PERF_TIMER_RESUME(sub));
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sc_sub(data[index1].scalar.bytes, data[index1].scalar.bytes, data[index2].scalar.bytes);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(sub));
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MULTIEXP_PERF(PERF_TIMER_RESUME(push));
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if (!(data[index1].scalar == rct::zero()))
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{
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heap.push_back(index1);
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std::push_heap(heap.begin(), heap.end(), Comp);
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}
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heap.push_back(index2);
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std::push_heap(heap.begin(), heap.end(), Comp);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(push));
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}
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MULTIEXP_PERF(PERF_TIMER_STOP(push));
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MULTIEXP_PERF(PERF_TIMER_STOP(sub));
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MULTIEXP_PERF(PERF_TIMER_STOP(add));
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MULTIEXP_PERF(PERF_TIMER_STOP(pop));
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MULTIEXP_PERF(PERF_TIMER_STOP(loop));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(end, 1000000));
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//return rct::scalarmultKey(data[index1].point, data[index1].scalar);
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index1 = heap.back();
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heap.pop_back();
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ge_p2 p2;
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ge_scalarmult(&p2, data[index1].scalar.bytes, &data[index1].point);
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rct::key res;
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ge_tobytes(res.bytes, &p2);
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return res;
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}
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rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> &data)
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{
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(bos_coster, 1000000));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(setup, 1000000));
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size_t points = data.size();
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CHECK_AND_ASSERT_THROW_MES(points > 1, "Not enough points");
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std::vector<size_t> heap(points);
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for (size_t n = 0; n < points; ++n)
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heap[n] = n;
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auto Comp = [&](size_t e0, size_t e1) { return data[e0].scalar < data[e1].scalar; };
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std::make_heap(heap.begin(), heap.end(), Comp);
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MULTIEXP_PERF(PERF_TIMER_STOP(setup));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(loop, 1000000));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(pop, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(pop));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(div, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(div));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(add, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(add));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(sub, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(sub));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(push, 1000000)); MULTIEXP_PERF(PERF_TIMER_PAUSE(push));
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while (heap.size() > 1)
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{
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MULTIEXP_PERF(PERF_TIMER_RESUME(pop));
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index1 = heap.back();
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heap.pop_back();
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index2 = heap.back();
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heap.pop_back();
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MULTIEXP_PERF(PERF_TIMER_PAUSE(pop));
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ge_cached cached;
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ge_p1p1 p1;
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MULTIEXP_PERF(PERF_TIMER_RESUME(div));
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while (1)
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{
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rct::key s1_2 = div2(data[index1].scalar);
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if (!(data[index2].scalar < s1_2))
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break;
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if (data[index1].scalar.bytes[0] & 1)
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{
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data.resize(data.size()+1);
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data.back().scalar = rct::identity();
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data.back().point = data[index1].point;
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heap.push_back(data.size() - 1);
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std::push_heap(heap.begin(), heap.end(), Comp);
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}
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data[index1].scalar = div2(data[index1].scalar);
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ge_p3_to_cached(&cached, &data[index1].point);
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ge_add(&p1, &data[index1].point, &cached);
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ge_p1p1_to_p3(&data[index1].point, &p1);
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}
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MULTIEXP_PERF(PERF_TIMER_PAUSE(div));
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MULTIEXP_PERF(PERF_TIMER_RESUME(add));
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ge_p3_to_cached(&cached, &data[index1].point);
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ge_add(&p1, &data[index2].point, &cached);
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ge_p1p1_to_p3(&data[index2].point, &p1);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(add));
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MULTIEXP_PERF(PERF_TIMER_RESUME(sub));
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sc_sub(data[index1].scalar.bytes, data[index1].scalar.bytes, data[index2].scalar.bytes);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(sub));
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MULTIEXP_PERF(PERF_TIMER_RESUME(push));
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if (!(data[index1].scalar == rct::zero()))
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{
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heap.push_back(index1);
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std::push_heap(heap.begin(), heap.end(), Comp);
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}
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heap.push_back(index2);
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std::push_heap(heap.begin(), heap.end(), Comp);
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MULTIEXP_PERF(PERF_TIMER_PAUSE(push));
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}
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MULTIEXP_PERF(PERF_TIMER_STOP(push));
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MULTIEXP_PERF(PERF_TIMER_STOP(sub));
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MULTIEXP_PERF(PERF_TIMER_STOP(add));
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MULTIEXP_PERF(PERF_TIMER_STOP(pop));
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MULTIEXP_PERF(PERF_TIMER_STOP(loop));
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MULTIEXP_PERF(PERF_TIMER_START_UNIT(end, 1000000));
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//return rct::scalarmultKey(data[index1].point, data[index1].scalar);
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std::pop_heap(heap.begin(), heap.end(), Comp);
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size_t index1 = heap.back();
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heap.pop_back();
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ge_p2 p2;
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ge_scalarmult(&p2, data[index1].scalar.bytes, &data[index1].point);
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rct::key res;
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ge_tobytes(res.bytes, &p2);
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return res;
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}
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}
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