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Implement CBLSInsecureBatchVerifier for convenient batch verification
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// Copyright (c) 2018 The Dash Core developers | ||
// Distributed under the MIT/X11 software license, see the accompanying | ||
// file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
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#ifndef DASH_CRYPTO_BLS_BATCHVERIFIER_H | ||
#define DASH_CRYPTO_BLS_BATCHVERIFIER_H | ||
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#include "bls.h" | ||
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#include <map> | ||
#include <vector> | ||
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template<typename SourceId, typename MessageId> | ||
class CBLSInsecureBatchVerifier | ||
{ | ||
private: | ||
struct Message { | ||
MessageId msgId; | ||
uint256 msgHash; | ||
CBLSSignature sig; | ||
CBLSPublicKey pubKey; | ||
}; | ||
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typedef std::map<MessageId, Message> MessageMap; | ||
typedef typename MessageMap::iterator MessageMapIterator; | ||
typedef std::map<SourceId, std::vector<MessageMapIterator>> MessagesBySourceMap; | ||
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MessageMap messages; | ||
MessagesBySourceMap messagesBySource; | ||
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public: | ||
std::set<SourceId> badSources; | ||
std::set<MessageId> badMessages; | ||
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public: | ||
void PushMessage(const SourceId& sourceId, const MessageId& msgId, const uint256& msgHash, const CBLSSignature& sig, const CBLSPublicKey& pubKey) | ||
{ | ||
assert(sig.IsValid() && pubKey.IsValid()); | ||
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auto it = messages.emplace(msgId, Message{msgId, msgHash, sig, pubKey}).first; | ||
messagesBySource[sourceId].emplace_back(it); | ||
} | ||
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void Verify(bool perMessageFallback) | ||
{ | ||
std::map<uint256, std::vector<MessageMapIterator>> byMessageHash; | ||
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for (auto it = messages.begin(); it != messages.end(); ++it) { | ||
byMessageHash[it->second.msgHash].emplace_back(it); | ||
} | ||
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if (VerifyBatch(byMessageHash)) { | ||
// full batch is valid | ||
return; | ||
} | ||
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// revert to per-source verification | ||
for (const auto& p : messagesBySource) { | ||
bool batchValid = false; | ||
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// no need to verify it again if there was just one source | ||
if (messagesBySource.size() != 1) { | ||
byMessageHash.clear(); | ||
for (auto it = p.second.begin(); it != p.second.end(); ++it) { | ||
byMessageHash[(*it)->second.msgHash].emplace_back(*it); | ||
} | ||
batchValid = VerifyBatch(byMessageHash); | ||
} | ||
if (!batchValid) { | ||
badSources.emplace(p.first); | ||
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if (perMessageFallback) { | ||
// revert to per-message verification | ||
if (p.second.size() == 1) { | ||
// no need to re-verify a single message | ||
badMessages.emplace(p.second[0]->second.msgId); | ||
} else { | ||
for (const auto& msgIt : p.second) { | ||
if (badMessages.count(msgIt->first)) { | ||
// same message might be invalid from different source, so no need to re-verify it | ||
continue; | ||
} | ||
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const auto& msg = msgIt->second; | ||
if (!msg.sig.VerifyInsecure(msg.pubKey, msg.msgHash)) { | ||
badMessages.emplace(msg.msgId); | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} | ||
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private: | ||
bool VerifyBatch(const std::map<uint256, std::vector<MessageMapIterator>>& byMessageHash) | ||
{ | ||
CBLSSignature aggSig; | ||
std::vector<uint256> msgHashes; | ||
std::vector<CBLSPublicKey> pubKeys; | ||
std::set<MessageId> dups; | ||
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msgHashes.reserve(messages.size()); | ||
pubKeys.reserve(messages.size()); | ||
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for (const auto& p : byMessageHash) { | ||
const auto& msgHash = p.first; | ||
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CBLSPublicKey aggPubKey; | ||
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for (const auto& msgIt : p.second) { | ||
const auto& msg = msgIt->second; | ||
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if (!dups.emplace(msg.msgId).second) { | ||
continue; | ||
} | ||
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if (!aggSig.IsValid()) { | ||
aggSig = msg.sig; | ||
} else { | ||
aggSig.AggregateInsecure(msg.sig); | ||
} | ||
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if (!aggPubKey.IsValid()) { | ||
aggPubKey = msg.pubKey; | ||
} else { | ||
aggPubKey.AggregateInsecure(msg.pubKey); | ||
} | ||
} | ||
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if (!aggSig.IsValid()) { | ||
// only duplicates for this msgHash | ||
continue; | ||
} | ||
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msgHashes.emplace_back(msgHash); | ||
pubKeys.emplace_back(aggPubKey); | ||
} | ||
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if (msgHashes.empty()) { | ||
return true; | ||
} | ||
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return aggSig.VerifyInsecureAggregated(pubKeys, msgHashes); | ||
} | ||
}; | ||
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#endif //DASH_CRYPTO_BLS_BATCHVERIFIER_H |