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710df6d4e8
Since the scriptPubKey for signing blocks never changes, there's no point reading repeating it from every block header.
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "pow.h"
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#include "arith_uint256.h"
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#include "chain.h"
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#include "chainparams.h"
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#include "core_io.h"
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#include "hash.h"
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#include "keystore.h"
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#include "primitives/block.h"
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#include "primitives/bitcoin/block.h"
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#include "script/generic.hpp"
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#include "script/standard.h"
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#include "uint256.h"
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#ifdef ENABLE_WALLET
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#include "wallet/wallet.h"
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#endif
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CScript CombineBlockSignatures(const Consensus::Params& params, const CBlockHeader& header, const CScript& scriptSig1, const CScript& scriptSig2)
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{
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SignatureData sig1(scriptSig1);
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SignatureData sig2(scriptSig2);
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return GenericCombineSignatures(params.signblockscript, header, sig1, sig2).scriptSig;
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}
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bool CheckChallenge(const CBlockHeader& block, const CBlockIndex& indexLast, const Consensus::Params& params)
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{
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return block.proof.challenge == indexLast.proof.challenge;
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}
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void ResetChallenge(CBlockHeader& block, const CBlockIndex& indexLast, const Consensus::Params& params)
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{
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block.proof.challenge = indexLast.proof.challenge;
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}
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bool CheckBitcoinProof(uint256 hash, unsigned int nBits)
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{
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bool fNegative;
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bool fOverflow;
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arith_uint256 bnTarget;
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bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
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// Check range
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if (fNegative || bnTarget == 0 || fOverflow || bnTarget > UintToArith256(Params().GetConsensus().parentChainPowLimit))
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return false;
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// Check proof of work matches claimed amount
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if (UintToArith256(hash) > bnTarget)
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return false;
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return true;
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}
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bool CheckProof(const CBlockHeader& block, const Consensus::Params& params)
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{
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if (block.GetHash() == params.hashGenesisBlock)
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return true;
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// Some important anti-DoS flags.
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// Note: Blockhashes do not commit to the proof.
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// Therefore we may have a signature be mealleated
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// to stay valid, but cause the block to fail
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// validation, in this case, block weight.
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// In that case, the block will be marked as permanently
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// invalid and not processed.
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// NOTE: These have only been deemed sufficient for OP_CMS
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// ANY OTHER SCRIPT TYPE MAY REQUIRE DIFFERENT FLAGS/CONSIDERATIONS
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// TODO: Better design to not have to worry about script specifics
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// i.e. exempt block header solution from weight limit
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unsigned int proof_flags = SCRIPT_VERIFY_P2SH // Just allows P2SH evaluation
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| SCRIPT_VERIFY_STRICTENC // Minimally-sized DER sigs
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| SCRIPT_VERIFY_NULLDUMMY // No extra data stuffed into OP_CMS witness
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| SCRIPT_VERIFY_CLEANSTACK // No extra pushes leftover in witness
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| SCRIPT_VERIFY_MINIMALDATA // Pushes are minimally-sized
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| SCRIPT_VERIFY_SIGPUSHONLY // Witness is push-only
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| SCRIPT_VERIFY_LOW_S // Stop easiest signature fiddling
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| SCRIPT_VERIFY_WITNESS // Required for cleanstack eval in VerifyScript
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| SCRIPT_NO_SIGHASH_BYTE; // non-Check(Multi)Sig signatures will not have sighash byte
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return GenericVerifyScript(block.proof.solution, params.signblockscript, proof_flags, block);
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}
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bool MaybeGenerateProof(const Consensus::Params& params, CBlockHeader *pblock, CWallet *pwallet)
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{
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#ifdef ENABLE_WALLET
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SignatureData solution(pblock->proof.solution);
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bool res = GenericSignScript(*pwallet, *pblock, params.signblockscript, solution);
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pblock->proof.solution = solution.scriptSig;
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return res;
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#endif
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return false;
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}
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void ResetProof(CBlockHeader& block)
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{
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block.proof.solution.clear();
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}
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