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make straus cached mode thread safe, and add tests for it

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moneromooo-monero 2018-01-18 12:01:45 +00:00
parent 7f48bf05d7
commit e895c3def1
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7 changed files with 233 additions and 35 deletions
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11
src/ringct/bulletproofs.cc
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@ -61,6 +61,7 @@ static constexpr size_t maxM = 16;
static rct::key Hi[maxN*maxM], Gi[maxN*maxM];
static ge_p3 Hi_p3[maxN*maxM], Gi_p3[maxN*maxM];
static ge_dsmp Gprecomp[maxN*maxM], Hprecomp[maxN*maxM];
static std::shared_ptr<straus_cached_data> HiGi_cache;
static const rct::key TWO = { {0x02, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
static const rct::keyV oneN = vector_dup(rct::identity(), maxN);
static const rct::keyV twoN = vector_powers(TWO, maxN);
@ -70,7 +71,7 @@ static boost::mutex init_mutex;
static inline rct::key multiexp(const std::vector<MultiexpData> &data, bool HiGi)
{
if (HiGi || data.size() < 1000)
return straus(data, HiGi);
return straus(data, HiGi ? HiGi_cache: NULL);
else
return bos_coster_heap_conv_robust(data);
}
@ -116,6 +117,7 @@ static void init_exponents()
static bool init_done = false;
if (init_done)
return;
std::vector<MultiexpData> data;
for (size_t i = 0; i < maxN*maxM; ++i)
{
Hi[i] = get_exponent(rct::H, i * 2);
@ -124,8 +126,13 @@ static void init_exponents()
Gi[i] = get_exponent(rct::H, i * 2 + 1);
rct::precomp(Gprecomp[i], Gi[i]);
CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&Gi_p3[i], Gi[i].bytes) == 0, "ge_frombytes_vartime failed");
data.push_back({rct::zero(), Gi[i]});
data.push_back({rct::zero(), Hi[i]});
}
MINFO("cache size: " << (sizeof(Hi)+sizeof(Hprecomp)+sizeof(Hi_p3))*2/1024 << " kB");
HiGi_cache = straus_init_cache(data);
size_t cache_size = (sizeof(Hi)+sizeof(Hprecomp)+sizeof(Hi_p3))*2 + straus_get_cache_size(HiGi_cache);
MINFO("cache size: " << cache_size/1024 << " kB");
init_done = true;
}

86
src/ringct/multiexp.cc
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@ -259,15 +259,58 @@ rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> data)
return res;
}
rct::key straus(const std::vector<MultiexpData> &data, bool HiGi)
struct straus_cached_data
{
std::vector<std::vector<ge_cached>> multiples;
};
static constexpr unsigned int STRAUS_C = 4;
std::shared_ptr<straus_cached_data> straus_init_cache(const std::vector<MultiexpData> &data)
{
MULTIEXP_PERF(PERF_TIMER_START_UNIT(multiples, 1000000));
ge_cached cached;
ge_p1p1 p1;
ge_p3 p3;
std::shared_ptr<straus_cached_data> cache(new straus_cached_data());
cache->multiples.resize(1<<STRAUS_C);
size_t offset = cache->multiples[1].size();
cache->multiples[1].resize(std::max(offset, data.size()));
for (size_t i = offset; i < data.size(); ++i)
ge_p3_to_cached(&cache->multiples[1][i], &data[i].point);
for (size_t i=2;i<1<<STRAUS_C;++i)
cache->multiples[i].resize(std::max(offset, data.size()));
for (size_t j=offset;j<data.size();++j)
{
for (size_t i=2;i<1<<STRAUS_C;++i)
{
ge_add(&p1, &data[j].point, &cache->multiples[i-1][j]);
ge_p1p1_to_p3(&p3, &p1);
ge_p3_to_cached(&cache->multiples[i][j], &p3);
}
}
MULTIEXP_PERF(PERF_TIMER_STOP(multiples));
return cache;
}
size_t straus_get_cache_size(const std::shared_ptr<straus_cached_data> &cache)
{
size_t sz = 0;
for (const auto &e0: cache->multiples)
sz += e0.size() * sizeof(ge_p3);
return sz;
}
rct::key straus(const std::vector<MultiexpData> &data, const std::shared_ptr<straus_cached_data> &cache)
{
MULTIEXP_PERF(PERF_TIMER_UNIT(straus, 1000000));
bool HiGi = cache != NULL;
MULTIEXP_PERF(PERF_TIMER_START_UNIT(setup, 1000000));
static constexpr unsigned int c = 4;
static constexpr unsigned int mask = (1<<c)-1;
static std::vector<std::vector<ge_cached>> HiGi_multiples;
std::vector<std::vector<ge_cached>> local_multiples, &multiples = HiGi ? HiGi_multiples : local_multiples;
static constexpr unsigned int mask = (1<<STRAUS_C)-1;
std::shared_ptr<straus_cached_data> local_cache = cache == NULL ? straus_init_cache(data) : cache;
ge_cached cached;
ge_p1p1 p1;
ge_p3 p3;
@ -276,25 +319,6 @@ rct::key straus(const std::vector<MultiexpData> &data, bool HiGi)
for (size_t i = 0; i < data.size(); ++i)
skip[i] = data[i].scalar == rct::zero() || !memcmp(&data[i].point, &ge_p3_identity, sizeof(ge_p3));
MULTIEXP_PERF(PERF_TIMER_START_UNIT(multiples, 1000000));
multiples.resize(1<<c);
size_t offset = multiples[1].size();
multiples[1].resize(std::max(offset, data.size()));
for (size_t i = offset; i < data.size(); ++i)
ge_p3_to_cached(&multiples[1][i], &data[i].point);
for (size_t i=2;i<1<<c;++i)
multiples[i].resize(std::max(offset, data.size()));
for (size_t j=offset;j<data.size();++j)
{
for (size_t i=2;i<1<<c;++i)
{
ge_add(&p1, &data[j].point, &multiples[i-1][j]);
ge_p1p1_to_p3(&p3, &p1);
ge_p3_to_cached(&multiples[i][j], &p3);
}
}
MULTIEXP_PERF(PERF_TIMER_STOP(multiples));
MULTIEXP_PERF(PERF_TIMER_START_UNIT(digits, 1000000));
std::vector<std::vector<uint8_t>> digits;
digits.resize(data.size());
@ -305,7 +329,7 @@ rct::key straus(const std::vector<MultiexpData> &data, bool HiGi)
memcpy(bytes33, data[j].scalar.bytes, 32);
bytes33[32] = 0;
#if 1
static_assert(c == 4, "optimized version needs c == 4");
static_assert(STRAUS_C == 4, "optimized version needs STRAUS_C == 4");
const unsigned char *bytes = bytes33;
unsigned int i;
for (i = 0; i < 256; i += 8, bytes++)
@ -339,22 +363,22 @@ rct::key straus(const std::vector<MultiexpData> &data, bool HiGi)
maxscalar = data[i].scalar;
size_t i = 0;
while (i < 256 && !(maxscalar < pow2(i)))
i += c;
i += STRAUS_C;
MULTIEXP_PERF(PERF_TIMER_STOP(setup));
ge_p3 res_p3 = ge_p3_identity;
if (!(i < c))
if (!(i < STRAUS_C))
goto skipfirst;
while (!(i < c))
while (!(i < STRAUS_C))
{
for (size_t j = 0; j < c; ++j)
for (size_t j = 0; j < STRAUS_C; ++j)
{
ge_p3_to_cached(&cached, &res_p3);
ge_add(&p1, &res_p3, &cached);
ge_p1p1_to_p3(&res_p3, &p1);
}
skipfirst:
i -= c;
i -= STRAUS_C;
for (size_t j = 0; j < data.size(); ++j)
{
if (skip[j])
@ -362,7 +386,7 @@ skipfirst:
int digit = digits[j][i];
if (digit)
{
ge_add(&p1, &res_p3, &multiples[digit][j]);
ge_add(&p1, &res_p3, &local_cache->multiples[digit][j]);
ge_p1p1_to_p3(&res_p3, &p1);
}
}

7
src/ringct/multiexp.h
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@ -36,6 +36,7 @@
#include <vector>
#include "crypto/crypto.h"
#include "rctTypes.h"
#include "misc_log_ex.h"
namespace rct
{
@ -52,9 +53,13 @@ struct MultiexpData {
}
};
struct straus_cached_data;
rct::key bos_coster_heap_conv(std::vector<MultiexpData> data);
rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> data);
rct::key straus(const std::vector<MultiexpData> &data, bool HiGi = false);
std::shared_ptr<straus_cached_data> straus_init_cache(const std::vector<MultiexpData> &data);
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);
}

7
tests/performance_tests/main.cpp
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@ -221,6 +221,13 @@ int main(int argc, char** argv)
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus, 1024);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus, 4096);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 2);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 8);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 16);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 256);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 1024);
TEST_PERFORMANCE2(filter, verbose, test_multiexp, multiexp_straus_cached, 4096);
std::cout << "Tests finished. Elapsed time: " << timer.elapsed_ms() / 1000 << " sec" << std::endl;
return 0;

7
tests/performance_tests/multiexp.h
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@ -38,6 +38,7 @@ enum test_multiexp_algorithm
{
multiexp_bos_coster,
multiexp_straus,
multiexp_straus_cached,
};
template<test_multiexp_algorithm algorithm, size_t npoints>
@ -59,6 +60,7 @@ public:
rct::key kn = rct::scalarmultKey(point, data[n].scalar);
res = rct::addKeys(res, kn);
}
cache = rct::straus_init_cache(data);
return true;
}
@ -69,7 +71,9 @@ public:
case multiexp_bos_coster:
return res == bos_coster_heap_conv_robust(data);
case multiexp_straus:
return res == straus(data, false);
return res == straus(data);
case multiexp_straus_cached:
return res == straus(data, cache);
default:
return false;
}
@ -77,5 +81,6 @@ public:
private:
std::vector<rct::MultiexpData> data;
std::shared_ptr<rct::straus_cached_data> cache;
rct::key res;
};

1
tests/unit_tests/CMakeLists.txt
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@ -58,6 +58,7 @@ set(unit_tests_sources
mlocker.cpp
mnemonics.cpp
mul_div.cpp
multiexp.cpp
multisig.cpp
parse_amount.cpp
random.cpp

149
tests/unit_tests/multiexp.cpp Normal file
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@ -0,0 +1,149 @@
// 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.
#include "gtest/gtest.h"
#include "crypto/crypto.h"
#include "ringct/rctOps.h"
#include "ringct/multiexp.h"
static const rct::key TESTSCALAR = rct::H;
static const rct::key TESTPOINT = rct::scalarmultBase(rct::H);
static rct::key basic(const std::vector<rct::MultiexpData> &data)
{
ge_p3 res_p3 = ge_p3_identity;
for (const auto &d: data)
{
ge_cached cached;
ge_p3 p3;
ge_p1p1 p1;
ge_scalarmult_p3(&p3, d.scalar.bytes, &d.point);
ge_p3_to_cached(&cached, &p3);
ge_add(&p1, &res_p3, &cached);
ge_p1p1_to_p3(&res_p3, &p1);
}
rct::key res;
ge_p3_tobytes(res.bytes, &res_p3);
return res;
}
static ge_p3 get_p3(const rct::key &point)
{
ge_p3 p3;
EXPECT_TRUE(ge_frombytes_vartime(&p3, point.bytes) == 0);
return p3;
}
TEST(multiexp, bos_coster_empty)
{
std::vector<rct::MultiexpData> data;
data.push_back({rct::zero(), get_p3(rct::identity())});
ASSERT_TRUE(basic(data) == bos_coster_heap_conv_robust(data));
}
TEST(multiexp, straus_empty)
{
std::vector<rct::MultiexpData> data;
data.push_back({rct::zero(), get_p3(rct::identity())});
ASSERT_TRUE(basic(data) == straus(data));
}
TEST(multiexp, bos_coster_only_zeroes)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 16; ++n)
data.push_back({rct::zero(), get_p3(TESTPOINT)});
ASSERT_TRUE(basic(data) == bos_coster_heap_conv_robust(data));
}
TEST(multiexp, straus_only_zeroes)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 16; ++n)
data.push_back({rct::zero(), get_p3(TESTPOINT)});
ASSERT_TRUE(basic(data) == straus(data));
}
TEST(multiexp, bos_coster_only_identities)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 16; ++n)
data.push_back({TESTSCALAR, get_p3(rct::identity())});
ASSERT_TRUE(basic(data) == bos_coster_heap_conv_robust(data));
}
TEST(multiexp, straus_only_identities)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 16; ++n)
data.push_back({TESTSCALAR, get_p3(rct::identity())});
ASSERT_TRUE(basic(data) == straus(data));
}
TEST(multiexp, bos_coster_random)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 32; ++n)
{
data.push_back({rct::skGen(), get_p3(rct::scalarmultBase(rct::skGen()))});
ASSERT_TRUE(basic(data) == bos_coster_heap_conv_robust(data));
}
}
TEST(multiexp, straus_random)
{
std::vector<rct::MultiexpData> data;
for (int n = 0; n < 32; ++n)
{
data.push_back({rct::skGen(), get_p3(rct::scalarmultBase(rct::skGen()))});
ASSERT_TRUE(basic(data) == straus(data));
}
}
TEST(multiexp, straus_cached)
{
static constexpr size_t N = 256;
std::vector<rct::MultiexpData> P(N);
for (size_t n = 0; n < N; ++n)
{
P[n].scalar = rct::zero();
ASSERT_TRUE(ge_frombytes_vartime(&P[n].point, rct::scalarmultBase(rct::skGen()).bytes) == 0);
}
std::shared_ptr<rct::straus_cached_data> cache = rct::straus_init_cache(P);
for (size_t n = 0; n < N/16; ++n)
{
std::vector<rct::MultiexpData> data;
size_t sz = 1 + crypto::rand<size_t>() % (N-1);
for (size_t s = 0; s < sz; ++s)
{
data.push_back({rct::skGen(), P[s].point});
}
ASSERT_TRUE(basic(data) == straus(data, cache));
}
}