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Differential D9212 Diff 27662 src/script/sigcache.cpp

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src/script/sigcache.cpp

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/** /**
* Valid signature cache, to avoid doing expensive ECDSA signature checking * Valid signature cache, to avoid doing expensive ECDSA signature checking
* twice for every transaction (once when accepted into memory pool, and * twice for every transaction (once when accepted into memory pool, and
* again when accepted into the block chain) * again when accepted into the block chain)
*/ */
class CSignatureCache { class CSignatureCache {
private: private:
//! Entries are SHA256(nonce || signature hash || public key || signature): //! Entries are SHA256(nonce || signature hash || public key || signature):
uint256 nonce; CSHA256 m_salted_hasher;
typedef CuckooCache::cache<CuckooCache::KeyOnly<uint256>, typedef CuckooCache::cache<CuckooCache::KeyOnly<uint256>,
SignatureCacheHasher> SignatureCacheHasher>
map_type; map_type;
map_type setValid; map_type setValid;
boost::shared_mutex cs_sigcache; boost::shared_mutex cs_sigcache;
public: public:
CSignatureCache() { GetRandBytes(nonce.begin(), 32); } CSignatureCache() {
uint256 nonce = GetRandHash();
// We want the nonce to be 64 bytes long to force the hasher to process
// this chunk, which makes later hash computations more efficient. We
// just write our 32-byte entropy twice to fill the 64 bytes.
m_salted_hasher.Write(nonce.begin(), 32);
m_salted_hasher.Write(nonce.begin(), 32);
}
void ComputeEntry(uint256 &entry, const uint256 &hash, void ComputeEntry(uint256 &entry, const uint256 &hash,
const std::vector<uint8_t> &vchSig, const std::vector<uint8_t> &vchSig,
const CPubKey &pubkey) { const CPubKey &pubkey) {
CSHA256() CSHA256 hasher = m_salted_hasher;
.Write(nonce.begin(), 32) hasher.Write(hash.begin(), 32)
.Write(hash.begin(), 32)
.Write(&pubkey[0], pubkey.size()) .Write(&pubkey[0], pubkey.size())
.Write(&vchSig[0], vchSig.size()) .Write(&vchSig[0], vchSig.size())
.Finalize(entry.begin()); .Finalize(entry.begin());
} }
bool Get(const uint256 &entry, const bool erase) { bool Get(const uint256 &entry, const bool erase) {
boost::shared_lock<boost::shared_mutex> lock(cs_sigcache); boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
return setValid.contains(entry, erase); return setValid.contains(entry, erase);
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