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Update PAK internals, helper functions

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This commit is contained in:
Gregory Sanders 2019-05-31 12:39:55 -04:00
parent 16b87ba951
commit 804cd9f75f
5 changed files with 76 additions and 187 deletions
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77
src/validation.cpp
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@ -2628,17 +2628,6 @@ bool CChainState::ConnectTip(CValidationState& state, const CChainParams& chainp
if (!FlushStateToDisk(chainparams, state, FlushStateMode::IF_NEEDED))
return false;
// Get PAK commitment from coinbase, if it exists
boost::optional<CPAKList> paklist = GetPAKKeysFromCommitment(*blockConnecting.vtx[0]);
if (paklist) {
std::vector<std::vector<unsigned char> > offline_keys;
std::vector<std::vector<unsigned char> > online_keys;
bool is_reject;
paklist->ToBytes(offline_keys, online_keys, is_reject);
pblocktree->WritePAKList(offline_keys, online_keys, is_reject);
g_paklist_blockchain = *paklist;
}
int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4;
LogPrint(BCLog::BENCH, " - Writing chainstate: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime5 - nTime4) * MILLI, nTimeChainState * MICRO, nTimeChainState * MILLI / nBlocksTotal);
// Remove conflicting transactions from the mempool.;
@ -3448,72 +3437,6 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
}
// ELEMENTS
boost::optional<CPAKList> GetPAKKeysFromCommitment(const CTransaction& coinbase)
{
std::vector<std::vector<unsigned char> > offline_keys;
std::vector<std::vector<unsigned char> > online_keys;
bool is_reject = false;
for (unsigned int i = 0; i < coinbase.vout.size(); i++) {
const CScript& scriptPubKey = coinbase.vout[i].scriptPubKey;
// OP + push + 4 bytes + push + 33 bytes + push + 33 bytes
// or
// OP + push + 4 bytes + push + 6 bytes (REJECT)
CScript::const_iterator pc = scriptPubKey.begin();
std::vector<unsigned char> data;
opcodetype opcode;
if (!scriptPubKey.GetOp(pc, opcode, data) || opcode != OP_RETURN){
continue;
}
if (!scriptPubKey.GetOp(pc, opcode, data) || data.size() != 4 ||
data[0] != 0xab || data[1] != 0x22 || data[2] != 0xaa || data[3] != 0xee) {
continue;
}
if (!scriptPubKey.GetOp(pc, opcode, data)){
continue;
}
// Check for pak list reject signal
// Returns an empty list regardless of other commitments
if (data.size() == 6 && data[0] == 'R' && data[1] == 'E' && data[2] == 'J' && data[3] == 'E' && data[4] == 'C' && data[5] == 'T') {
is_reject = true;
continue;
}
// Check for offline key
if (data.size() != 33) {
continue;
}
// Check for online key
std::vector<unsigned char> data_online;
if (!scriptPubKey.GetOp(pc, opcode, data_online) || data_online.size() != 33) {
continue;
}
offline_keys.push_back(data);
online_keys.push_back(data_online);
}
if (is_reject) {
offline_keys.clear();
online_keys.clear();
}
if (!is_reject && offline_keys.size() == 0) {
return boost::none;
}
CPAKList paklist;
if (!CPAKList::FromBytes(paklist, offline_keys, online_keys, is_reject)) {
return boost::none;
} else {
return paklist;
}
}
/** Context-dependent validity checks.