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96 lines
3.7 KiB
C++
96 lines
3.7 KiB
C++
// Copyright (c) 2020, 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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#include <string.h>
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#include "misc_log_ex.h"
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#include "int-util.h"
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#include "crypto/crypto.h"
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#include "common/util.h"
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#include "merge_mining.h"
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using namespace epee;
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "cn.mm"
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using namespace crypto;
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namespace cryptonote
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{
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//---------------------------------------------------------------
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uint32_t get_aux_slot(const crypto::hash &id, uint32_t nonce, uint32_t n_aux_chains)
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{
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CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
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uint8_t buf[HASH_SIZE + sizeof(uint32_t) + 1];
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memcpy(buf, &id, HASH_SIZE);
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uint32_t v = SWAP32LE(nonce);
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memcpy(buf + HASH_SIZE, &v, sizeof(uint32_t));
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buf[HASH_SIZE + sizeof(uint32_t)] = config::HASH_KEY_MM_SLOT;
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crypto::hash res;
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tools::sha256sum(buf, sizeof(buf), res);
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v = *((const uint32_t*)&res);
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return SWAP32LE(v) % n_aux_chains;
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}
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//---------------------------------------------------------------
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uint32_t get_path_from_aux_slot(uint32_t slot, uint32_t n_aux_chains)
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{
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CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
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CHECK_AND_ASSERT_THROW_MES(slot < n_aux_chains, "slot >= n_aux_chains");
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uint32_t path = 0;
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CHECK_AND_ASSERT_THROW_MES(tree_path(n_aux_chains, slot, &path), "Failed to get path from aux slot");
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return path;
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}
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//---------------------------------------------------------------
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uint32_t encode_mm_depth(uint32_t n_aux_chains, uint32_t nonce)
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{
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CHECK_AND_ASSERT_THROW_MES(n_aux_chains > 0, "n_aux_chains is 0");
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// how many bits to we need to representing n_aux_chains - 1
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uint32_t n_bits = 1;
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while ((1u << n_bits) < n_aux_chains && n_bits < 16)
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++n_bits;
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CHECK_AND_ASSERT_THROW_MES(n_bits <= 16, "Way too many bits required");
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const uint32_t depth = (n_bits - 1) | ((n_aux_chains - 1) << 3) | (nonce << (3 + n_bits));
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return depth;
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}
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//---------------------------------------------------------------
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bool decode_mm_depth(uint32_t depth, uint32_t &n_aux_chains, uint32_t &nonce)
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{
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const uint32_t n_bits = 1 + (depth & 7);
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n_aux_chains = 1 + (depth >> 3 & ((1 << n_bits) - 1));
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nonce = depth >> (3 + n_bits);
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return true;
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}
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//---------------------------------------------------------------
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}
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