2021-09-03 03:12:22 -06:00
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/*
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* This file is part of the Monero P2Pool <https://github.com/SChernykh/p2pool>
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* Copyright (c) 2021 SChernykh <https://github.com/SChernykh>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include "gtest/gtest.h"
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#include <random>
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2021-09-03 10:04:54 -06:00
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#include <sstream>
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2021-09-03 03:12:22 -06:00
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namespace p2pool {
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2021-09-03 14:28:54 -06:00
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TEST(difficulty_type, constructors)
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{
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difficulty_type diff;
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ASSERT_EQ(diff.lo, 0);
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ASSERT_EQ(diff.hi, 0);
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difficulty_type diff2(123, 456);
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ASSERT_EQ(diff2.lo, 123);
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ASSERT_EQ(diff2.hi, 456);
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}
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2021-09-03 03:12:22 -06:00
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TEST(difficulty_type, target)
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{
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// diff = 0
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{
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difficulty_type d(0, 0);
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ASSERT_EQ(d.target(), std::numeric_limits<uint64_t>::max());
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}
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// diff = 1
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{
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difficulty_type d(1, 0);
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ASSERT_EQ(d.target(), std::numeric_limits<uint64_t>::max());
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}
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// diff = 2^64
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{
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difficulty_type d(0, 1);
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ASSERT_EQ(d.target(), 1);
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}
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2021-09-03 14:28:54 -06:00
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// diff = max
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{
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difficulty_type d(std::numeric_limits<uint64_t>::max(), std::numeric_limits<uint64_t>::max());
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ASSERT_EQ(d.target(), 1);
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}
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2021-09-03 03:12:22 -06:00
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// diff = 2^32
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{
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difficulty_type d(1ull << 32, 0);
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ASSERT_EQ(d.target(), 1ull << 32);
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}
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// diff from block 2440918
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{
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difficulty_type d(334654765825ull, 0);
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ASSERT_EQ(d.target(), 55121714);
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}
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}
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TEST(difficulty_type, sum)
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{
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// No carry
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{
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difficulty_type diff[4] = { { 0, 0 }, { 1, 0 }, { 0, 1 }, { 1, 1 } };
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for (int i = 0; i <= 3; ++i) {
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for (int j = 0; j <= 3; ++j) {
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difficulty_type a = diff[i];
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a += diff[j];
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ASSERT_EQ(a.lo, diff[i].lo + diff[j].lo);
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ASSERT_EQ(a.hi, diff[i].hi + diff[j].hi);
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}
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}
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}
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// Carry
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{
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difficulty_type a(11400714819323198485ull, 0);
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difficulty_type b(15975348984942515101ull, 0);
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a += b;
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ASSERT_EQ(a.lo, 8929319730556161970ull);
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ASSERT_EQ(a.hi, 1);
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}
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// Carry (edge case)
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{
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difficulty_type a(std::numeric_limits<uint64_t>::max(), 0);
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difficulty_type b(1, 0);
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a += b;
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ASSERT_EQ(a.lo, 0);
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ASSERT_EQ(a.hi, 1);
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}
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}
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TEST(difficulty_type, compare)
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{
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const difficulty_type diff[4] = { { 0, 0 }, { 1, 0 }, { 0, 1 }, { 1, 1 } };
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for (int i = 0; i <= 3; ++i) {
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for (int j = 0; j <= 3; ++j) {
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ASSERT_EQ(diff[i] < diff[j], i < j);
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ASSERT_EQ(diff[i] >= diff[j], i >= j);
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ASSERT_EQ(diff[i] == diff[j], i == j);
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ASSERT_EQ(diff[i] != diff[j], i != j);
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}
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}
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}
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2021-09-03 10:04:54 -06:00
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TEST(difficulty_type, input_output)
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{
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auto test_value = [](uint64_t lo, uint64_t hi, const char* s) {
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difficulty_type diff{ lo, hi };
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std::stringstream ss;
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ss << diff;
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ASSERT_EQ(ss.str(), s);
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difficulty_type diff2;
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ss >> diff2;
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ASSERT_EQ(diff2, diff);
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};
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test_value(0, 0, "0");
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test_value(1, 0, "1");
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test_value(340599339356ull, 0, "340599339356");
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test_value(std::numeric_limits<uint64_t>::max(), 0, "18446744073709551615");
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test_value(0, 1, "18446744073709551616");
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test_value(1, 1, "18446744073709551617");
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test_value(7766279631452241919ull, 5, "99999999999999999999");
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test_value(7766279631452241920ull, 5, "100000000000000000000");
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test_value(7766279631452241921ull, 5, "100000000000000000001");
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test_value(14083847773837265618ull, 6692605942ull, "123456789012345678901234567890");
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test_value(std::numeric_limits<uint64_t>::max(), std::numeric_limits<uint64_t>::max(), "340282366920938463463374607431768211455");
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}
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2021-09-03 03:12:22 -06:00
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TEST(difficulty_type, check_pow)
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{
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hash h;
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// Power of 2 close to the current Monero network difficulty
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difficulty_type diff = { 1ull << 38, 0 };
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{
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// 2^256 / 2^38 = 2^218
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// diff.check_pow() will get 2^256 as a multiplication result = lowest possible value that fails the test
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uint64_t data[4] = { 0, 0, 0, 1ull << 26 };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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// Now decrease the hash by 1. It should pass the test now
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data[0] = data[1] = data[2] = std::numeric_limits<uint64_t>::max();
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--data[3];
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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}
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/*
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* Factors of 2^256 - 1:
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* P1 = 3
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* P1 = 5
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* P2 = 17
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* P3 = 257
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* P3 = 641
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* P5 = 65537
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* P6 = 274177
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* P7 = 6700417
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* P14 = 67280421310721
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* P17 = 59649589127497217
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* P22 = 5704689200685129054721
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*/
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diff = { 67280421310721ull, 0 };
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{
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// (2^256 - 1) / 67280421310721 = 1721036922503113971692907638171526209875755521904893141463060735
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// diff.check_pow() will get 2^256-1 as a multiplication result = highest possible value that still passes the test
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uint64_t data[4] = { 0xfffffffffffbd0ffull, 0x0000000000042f00ull, 0xfffffffffffbd0ffull, 0x42f00ull };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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// Now increase the hash by 1. It should not pass the test anymore
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++data[0];
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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}
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// diff = 5704689200685129054721
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diff = { 4645281908877605377ull, 309ull };
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{
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// (2^256 - 1) / 5704689200685129054721 = 20297703374166229616474325006177763232573806344580020735
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// diff.check_pow() will get 2^256-1 as a multiplication result = highest possible value that still passes the test
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uint64_t data[4] = { 0xff2c1503c50eb9ffull, 0xffffffffffffffffull, 0xd3eafc3af14600ull, 0 };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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// Now increase the hash by 1. It should not pass the test anymore
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++data[0];
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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}
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/*
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* Factors of 2^256 + 1:
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* P16 = 1238926361552897
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* P62 = 93461639715357977769163558199606896584051237541638188580280321
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*/
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diff = { 1238926361552897ull, 0 };
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{
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// (2^256 + 1) / 1238926361552897 = 93461639715357977769163558199606896584051237541638188580280321
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// diff.check_pow() will get 2^256+1 as a multiplication result = lowest possible non-power of 2 that fails the test
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uint64_t data[4] = { 0x49baa0ba2c911801ull, 0x6ee3637cab2586d0ull, 0x4c585a8f5c7073e3, 0x3a29ull };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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// Now decrease the hash by 1. It should pass the test now
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--data[0];
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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}
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// Randomized tests with fixed seed
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std::mt19937_64 r(0);
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for (int i = 0; i < 1000; ++i) {
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// Random difficulty between 300G and 400G
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difficulty_type diff{ 300000000000ull + (r() % 100000000000ull), 0 };
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hash h;
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// All zeros
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memset(h.h, 0, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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// All ones
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memset(h.h, -1, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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{
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uint64_t data[4];
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uint64_t rem;
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data[3] = udiv128(1, 0, diff.lo, &rem);
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data[2] = udiv128(rem, 0, diff.lo, &rem);
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data[1] = udiv128(rem, 0, diff.lo, &rem);
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data[0] = udiv128(rem, 0, diff.lo, &rem);
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// Max hash value that passes this difficulty
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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// Add 1 to data (256-bit number)
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for (int j = 0; j <= 3; ++j) {
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++data[j];
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if (data[j]) {
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// No carry, exit the loop
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break;
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}
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}
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// Min hash value that fails this difficulty
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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}
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const uint64_t target = diff.target();
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// Random values that pass
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for (int j = 0; j < 10000; ++j) {
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const uint64_t data[4] = { r(), r(), r(), r() % target };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), true);
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}
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// Random values that fail
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for (int j = 0; j < 10000; ++j) {
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const uint64_t data[4] = { r(), r(), r(), target + (r() % (std::numeric_limits<uint64_t>::max() - target + 1)) };
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memcpy(h.h, data, HASH_SIZE);
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ASSERT_EQ(diff.check_pow(h), false);
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}
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}
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}
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}
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