1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// Copyright (c) 2020-2023, 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 <string.h>
#include "misc_log_ex.h"
#include "int-util.h"
#include "crypto/crypto.h"
#include "common/util.h"
#include "merge_mining.h"
using namespace epee;
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "cn.mm"
using namespace crypto;
namespace cryptonote
{
//---------------------------------------------------------------
uint32_t get_aux_slot(const crypto::hash &id, uint32_t nonce, uint32_t n_aux_chains)
{
CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
uint8_t buf[HASH_SIZE + sizeof(uint32_t) + 1];
memcpy(buf, &id, HASH_SIZE);
uint32_t v = SWAP32LE(nonce);
memcpy(buf + HASH_SIZE, &v, sizeof(uint32_t));
buf[HASH_SIZE + sizeof(uint32_t)] = config::HASH_KEY_MM_SLOT;
crypto::hash res;
tools::sha256sum(buf, sizeof(buf), res);
v = *((const uint32_t*)&res);
return SWAP32LE(v) % n_aux_chains;
}
//---------------------------------------------------------------
uint32_t get_path_from_aux_slot(uint32_t slot, uint32_t n_aux_chains)
{
CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
CHECK_AND_ASSERT_THROW_MES(slot < n_aux_chains, "slot >= n_aux_chains");
uint32_t path = 0;
CHECK_AND_ASSERT_THROW_MES(tree_path(n_aux_chains, slot, &path), "Failed to get path from aux slot");
return path;
}
//---------------------------------------------------------------
uint32_t encode_mm_depth(uint32_t n_aux_chains, uint32_t nonce)
{
CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
// how many bits to we need to representing n_aux_chains - 1
uint32_t n_bits = 1;
while ((1u << n_bits) < n_aux_chains && n_bits < 16)
++n_bits;
CHECK_AND_ASSERT_THROW_MES(n_bits <= 16, "Way too many bits required");
const uint32_t depth = (n_bits - 1) | ((n_aux_chains - 1) << 3) | (nonce << (3 + n_bits));
return depth;
}
//---------------------------------------------------------------
bool decode_mm_depth(uint32_t depth, uint32_t &n_aux_chains, uint32_t &nonce)
{
const uint32_t n_bits = 1 + (depth & 7);
n_aux_chains = 1 + (depth >> 3 & ((1 << n_bits) - 1));
nonce = depth >> (3 + n_bits);
return true;
}
//---------------------------------------------------------------
}
|
