Electroneum
difficulty.cpp
Go to the documentation of this file.
1 // Copyright (c) 2019, The Monero Project
2 //
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without modification, are
6 // permitted provided that the following conditions are met:
7 //
8 // 1. Redistributions of source code must retain the above copyright notice, this list of
9 // conditions and the following disclaimer.
10 //
11 // 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 // of conditions and the following disclaimer in the documentation and/or other
13 // materials provided with the distribution.
14 //
15 // 3. Neither the name of the copyright holder nor the names of its contributors may be
16 // used to endorse or promote products derived from this software without specific
17 // prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
20 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
27 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 
29 #include "gtest/gtest.h"
31 
32 static cryptonote::difficulty_type MKDIFF(uint64_t high, uint64_t low)
33 {
35  d = (d << 64) | low;
36  return d;
37 }
38 
39 static crypto::hash MKHASH(uint64_t high, uint64_t low)
40 {
41  cryptonote::difficulty_type hash_target = high;
42  hash_target = (hash_target << 64) | low;
43  boost::multiprecision::uint256_t hash_value = std::numeric_limits<boost::multiprecision::uint256_t>::max() / hash_target;
44  crypto::hash h;
45  ((uint64_t*)&h)[0] = (hash_value & 0xffffffffffffffff).convert_to<uint64_t>();
46  hash_value >>= 64;
47  ((uint64_t*)&h)[1] = (hash_value & 0xffffffffffffffff).convert_to<uint64_t>();
48  hash_value >>= 64;
49  ((uint64_t*)&h)[2] = (hash_value & 0xffffffffffffffff).convert_to<uint64_t>();
50  hash_value >>= 64;
51  ((uint64_t*)&h)[3] = (hash_value & 0xffffffffffffffff).convert_to<uint64_t>();
52  return h;
53 }
54 
55 TEST(difficulty, check_hash)
56 {
57  ASSERT_TRUE(cryptonote::check_hash(MKHASH(0, 1), MKDIFF(0, 1)));
58  ASSERT_FALSE(cryptonote::check_hash(MKHASH(0, 1), MKDIFF(0, 2)));
59 
60  ASSERT_TRUE(cryptonote::check_hash(MKHASH(0, 0xffffffffffffffff), MKDIFF(0, 0xffffffffffffffff)));
61  ASSERT_FALSE(cryptonote::check_hash(MKHASH(0, 0xffffffffffffffff), MKDIFF(1, 0)));
62 
63  ASSERT_TRUE(cryptonote::check_hash(MKHASH(1, 1), MKDIFF(1, 1)));
64  ASSERT_FALSE(cryptonote::check_hash(MKHASH(1, 1), MKDIFF(1, 2)));
65 
66  ASSERT_TRUE(cryptonote::check_hash(MKHASH(0xffffffffffffffff, 1), MKDIFF(0xffffffffffffffff, 1)));
67  ASSERT_FALSE(cryptonote::check_hash(MKHASH(0xffffffffffffffff, 1), MKDIFF(0xffffffffffffffff, 2)));
68 }
#define ASSERT_FALSE(condition)
Definition: gtest.h:1868
TEST(difficulty, check_hash)
Definition: difficulty.cpp:55
bool check_hash(const crypto::hash &hash, difficulty_type difficulty)
Definition: difficulty.cpp:203
unsigned __int64 uint64_t
Definition: stdint.h:136
boost::multiprecision::uint128_t difficulty_type
Definition: difficulty.h:43
#define ASSERT_TRUE(condition)
Definition: gtest.h:1865
POD_CLASS hash
Definition: hash.h:50