133 lines
4.9 KiB
C++
133 lines
4.9 KiB
C++
// Copyright (c) 2011 Vince Durham
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#include "script.h"
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#include "auxpow.h"
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#include "init.h"
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using namespace std;
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using namespace boost;
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unsigned char pchMergedMiningHeader[] = { 0xfa, 0xbe, 'm', 'm' } ;
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void RemoveMergedMiningHeader(vector<unsigned char>& vchAux)
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{
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if (vchAux.begin() != std::search(vchAux.begin(), vchAux.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader)))
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throw runtime_error("merged mining aux too short");
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vchAux.erase(vchAux.begin(), vchAux.begin() + sizeof(pchMergedMiningHeader));
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}
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bool CAuxPow::Check(uint256 hashAuxBlock, int nChainID)
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{
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if (nIndex != 0)
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return error("AuxPow is not a generate");
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if (!TestNet() && parentBlockHeader.GetChainID() == nChainID)
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return error("Aux POW parent has our chain ID");
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if (vChainMerkleBranch.size() > 30)
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return error("Aux POW chain merkle branch too long");
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// Check that the chain merkle root is in the coinbase
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uint256 nRootHash = CBlock::CheckMerkleBranch(hashAuxBlock, vChainMerkleBranch, nChainIndex);
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vector<unsigned char> vchRootHash(nRootHash.begin(), nRootHash.end());
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std::reverse(vchRootHash.begin(), vchRootHash.end()); // correct endian
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// Check that we are in the parent block merkle tree
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if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != parentBlockHeader.hashMerkleRoot)
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return error("Aux POW merkle root incorrect");
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const CScript script = vin[0].scriptSig;
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// Check that the same work is not submitted twice to our chain.
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//
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CScript::const_iterator pcHead =
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std::search(script.begin(), script.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader));
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CScript::const_iterator pc =
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std::search(script.begin(), script.end(), vchRootHash.begin(), vchRootHash.end());
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if (pcHead == script.end())
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return error("MergedMiningHeader missing from parent coinbase");
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if (pc == script.end())
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return error("Aux POW missing chain merkle root in parent coinbase");
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if (pcHead != script.end())
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{
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// Enforce only one chain merkle root by checking that a single instance of the merged
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// mining header exists just before.
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if (script.end() != std::search(pcHead + 1, script.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader)))
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return error("Multiple merged mining headers in coinbase");
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if (pcHead + sizeof(pchMergedMiningHeader) != pc)
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return error("Merged mining header is not just before chain merkle root");
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}
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else
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{
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// For backward compatibility.
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// Enforce only one chain merkle root by checking that it starts early in the coinbase.
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// 8-12 bytes are enough to encode extraNonce and nBits.
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if (pc - script.begin() > 20)
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return error("Aux POW chain merkle root must start in the first 20 bytes of the parent coinbase");
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}
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// Ensure we are at a deterministic point in the merkle leaves by hashing
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// a nonce and our chain ID and comparing to the index.
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pc += vchRootHash.size();
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if (script.end() - pc < 8)
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return error("Aux POW missing chain merkle tree size and nonce in parent coinbase");
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int nSize;
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memcpy(&nSize, &pc[0], 4);
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if (nSize != (1 << vChainMerkleBranch.size()))
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return error("Aux POW merkle branch size does not match parent coinbase");
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int nNonce;
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memcpy(&nNonce, &pc[4], 4);
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// Choose a pseudo-random slot in the chain merkle tree
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// but have it be fixed for a size/nonce/chain combination.
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//
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// This prevents the same work from being used twice for the
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// same chain while reducing the chance that two chains clash
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// for the same slot.
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unsigned int rand = nNonce;
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rand = rand * 1103515245 + 12345;
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rand += nChainID;
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rand = rand * 1103515245 + 12345;
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if (nChainIndex != (rand % nSize))
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return error("Aux POW wrong index");
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return true;
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}
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CScript MakeCoinbaseWithAux(unsigned int nBits, unsigned int nExtraNonce, vector<unsigned char>& vchAux)
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{
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vector<unsigned char> vchAuxWithHeader(UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader));
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vchAuxWithHeader.insert(vchAuxWithHeader.end(), vchAux.begin(), vchAux.end());
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// Push OP_2 just in case we want versioning later
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return CScript() << nBits << nExtraNonce << OP_2 << vchAuxWithHeader;
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}
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void IncrementExtraNonceWithAux(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce, vector<unsigned char>& vchAux)
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{
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// Update nExtraNonce
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static uint256 hashPrevBlock;
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if (hashPrevBlock != pblock->hashPrevBlock)
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{
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nExtraNonce = 0;
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hashPrevBlock = pblock->hashPrevBlock;
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}
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++nExtraNonce;
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pblock->vtx[0].vin[0].scriptSig = MakeCoinbaseWithAux(pblock->nBits, nExtraNonce, vchAux);
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pblock->hashMerkleRoot = pblock->BuildMerkleTree();
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}
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