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67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 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 <chain.h>
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#include <primitives/block.h>
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#include <script/interpreter.h>
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#include <script/generic.hpp>
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bool CheckChallenge(const CBlockHeader& block, const CBlockIndex& indexLast, const Consensus::Params& params)
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{
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if (g_signed_blocks) {
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return block.proof.challenge == indexLast.proof.challenge;
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} else {
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return block.nBits == GetNextWorkRequired(&indexLast, &block, params);
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}
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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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static bool CheckProofGeneric(const CBlockHeader& block, const Consensus::Params& params, const CScript& challenge)
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{
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if (block.GetHash() == params.hashGenesisBlock)
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return true;
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if (block.proof.solution.size() > params.max_block_signature_size) {
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return false;
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}
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// Some anti-DoS flags, though consensus.max_block_signature_size caps the possible
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// danger in malleation of the block witness data.
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unsigned int proof_flags = SCRIPT_VERIFY_P2SH // For cleanstack evalution under segwit flag
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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, challenge, proof_flags, block);
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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 (g_signed_blocks) {
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return CheckProofGeneric(block, params, params.signblockscript);
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} else {
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return CheckProofOfWork(block.GetHash(), block.nBits, params);
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}
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}
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bool CheckProofSignedParent(const CBlockHeader& block, const Consensus::Params& params)
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{
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return CheckProofGeneric(block, params, params.parent_chain_signblockscript);
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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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