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Merge pull request #2 from cakedefi/feature_PoS_kernel
Feature PoS kernel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| #include <pos.h> | ||
| #include <pos_kernel.h> | ||
| #include <pow.h> | ||
| #include <chain.h> | ||
| #include <validation.h> | ||
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| #include <wallet/wallet.h> | ||
| #include <txdb.h> | ||
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| static bool CheckStakeModifier(const CBlockIndex* pindexPrev, const CBlock& block, const Consensus::Params& params) { | ||
| if (block.hashPrevBlock.IsNull()) | ||
| return block.stakeModifier.IsNull(); | ||
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| return block.stakeModifier == pos::ComputeStakeModifier_PoS(pindexPrev->stakeModifier, | ||
| block.proofOfStakeBody->coinstakePrevout); | ||
| } | ||
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| bool CheckBlockProof_headerOnly(const CBlockHeader& block, const Consensus::Params& params) { | ||
| return pos::CheckProofOfStake_headerOnly(block, params); | ||
| } | ||
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| bool CheckBlockProof(const CBlockIndex* pindexPrev, const CBlock& block, CCoinsViewCache& view, | ||
| const Consensus::Params& params) { | ||
| if (!CheckStakeModifier(pindexPrev, block, params)) { | ||
| return false; | ||
| } | ||
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| return pos::CheckProofOfStake(pindexPrev, block, view, params); | ||
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| } | ||
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| namespace pos { | ||
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| /// Check PoS signatures (PoS block hashes are signed with coinstake out pubkey) | ||
| bool CheckHeaderSignature(const CBlockHeader& block) { | ||
| if (!block.IsProofOfStake()) { | ||
| return true; | ||
| } | ||
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| if (block.proofOfStakeBody->sig.empty()) { | ||
| LogPrintf("CheckBlockSignature: Bad Block - PoS signature is empty\n"); | ||
| return false; | ||
| } | ||
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| CPubKey recoveredPubKey{}; | ||
| if (!recoveredPubKey.RecoverCompact(block.GetHashToSign(), block.proofOfStakeBody->sig)) { | ||
| LogPrintf("CheckBlockSignature: Bad Block - malformed signature\n"); | ||
| return false; | ||
| } | ||
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| if (recoveredPubKey.GetID() != block.proofOfStakeBody->pubKeyHash) { | ||
| LogPrintf("CheckBlockSignature: Bad Block - wrong signature\n"); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
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| bool CheckProofOfStake_headerOnly(const CBlockHeader& block, const Consensus::Params& params) { | ||
| if (!block.IsProofOfStake()) { | ||
| return error("CheckProofOfStake_headerOnly(): called on non-PoS %s", block.GetHash().ToString()); | ||
| } | ||
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| const int64_t coinstakeTime = (int64_t) block.GetBlockTime(); | ||
| const auto& body = *block.proofOfStakeBody; // checked to exist after IsProofOfStake | ||
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| // checking PoS kernel is faster, so check it first | ||
| if (!CheckKernelHash(block.stakeModifier, block.nBits, coinstakeTime, body.coinstakeAmount, | ||
| body.coinstakePrevout, params).hashOk) { | ||
| return false; | ||
| } | ||
| return CheckHeaderSignature(block); | ||
| } | ||
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| bool CheckProofOfStake(const CBlockIndex* pindexPrev, const CBlock& block, CCoinsViewCache& view, | ||
| const Consensus::Params& params) { | ||
| if (block.IsProofOfStake() != block.HasCoinstakeTx()) { | ||
| return false; // block claimed it's PoS, but doesn't have coinstakeTx | ||
| } | ||
| if (!block.IsCompleteProofOfStake()) { | ||
| return error("CheckProofOfStake(): called on a non-PoS block %s", block.GetHash().ToString()); | ||
| } | ||
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| const auto& body = *block.proofOfStakeBody; // checked to exist after IsProofOfStake | ||
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| if (body.coinstakePrevout != block.vtx[1]->vin[0].prevout) | ||
| return error("CheckProofOfStake(): block claimed PoS prevout doesn't match coinstakeTx (%s != %s)", body.coinstakePrevout.ToString(), block.vtx[1]->vin[0].prevout.ToString()); | ||
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| // check staker's pubKeyHash | ||
| { | ||
| std::vector<CTxDestination> addressRet; | ||
| txnouttype typeRet; | ||
| int nRet; | ||
| if (!ExtractDestinations(block.vtx[1]->vout[1].scriptPubKey, typeRet, addressRet, nRet)) | ||
| return error("CheckProofOfStake(): coinstakeTx scriptPubKey must be P2PKH"); | ||
| if (!(typeRet == txnouttype::TX_PUBKEYHASH && addressRet.size() == 1)) | ||
| return error("CheckProofOfStake(): coinstakeTx scriptPubKey must be P2PKH"); | ||
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| CKeyID keyID(boost::get<PKHash>(addressRet[0])); | ||
| if (keyID != body.pubKeyHash) | ||
| return error("CheckProofOfStake(): coinstakeTx scriptPubKey and block pubKeyHash mismatch"); | ||
| } | ||
|
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| // check staker's coin | ||
| { | ||
| const Coin& stakeCoin = view.AccessCoin(body.coinstakePrevout); | ||
| if (stakeCoin.IsSpent()) | ||
| return error("CheckProofOfStake : Could not find previous transaction for PoS %s\n", | ||
| body.coinstakePrevout.hash.ToString()); | ||
| if ((pindexPrev->nHeight - stakeCoin.nHeight) < params.pos.coinstakeMaturity) | ||
| return error("CheckProofOfStake(): coinstakeTx input must have at least 100 confirmations"); | ||
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| if (body.coinstakeAmount != stakeCoin.out.nValue) | ||
| return error("CheckProofOfStake(): coinstakeTx amount and block coinstakeAmount mismatch"); | ||
| // it's vital for security that we use the same scriptPubKey | ||
| if (block.vtx[1]->vout[1].scriptPubKey != stakeCoin.out.scriptPubKey) | ||
| return error("CheckProofOfStake(): coinstakeTx scriptPubKey and prev. scriptPubKey mismatch"); | ||
| } | ||
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| const int64_t coinstakeTime = (int64_t) block.GetBlockTime(); | ||
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| // checking PoS kernel is faster, so check it first | ||
| if (!CheckKernelHash(block.stakeModifier, block.nBits, coinstakeTime, body.coinstakeAmount, body.coinstakePrevout, | ||
| params).hashOk) { | ||
| return false; | ||
| } | ||
| return CheckHeaderSignature(block); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| #pragma once | ||
|
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| #include <consensus/params.h> | ||
| #include <arith_uint256.h> | ||
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| class CBlock; | ||
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| class CBlockIndex; | ||
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| class CBlockHeader; | ||
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| class CCoinsViewCache; | ||
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| namespace pos { | ||
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| /// Check PoS signatures (PoS block hashes are signed with privkey of first coinstake out pubkey) | ||
| bool CheckHeaderSignature(const CBlockHeader& block); | ||
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| /// Check kernel hash target and coinstake signature | ||
| bool CheckProofOfStake_headerOnly(const CBlockHeader& block, const Consensus::Params& params); | ||
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| /// Check kernel hash target and coinstake signature. Check that block coinstakeTx matches header | ||
| bool CheckProofOfStake(const CBlockIndex* pindexPrev, const CBlock& block, CCoinsViewCache& view, | ||
| const Consensus::Params& params); | ||
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| } | ||
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